10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2022

Or
☐	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number: 001-16209

 

ARCH CAPITAL GROUP LTD.

(Exact name of registrant as specified in its charter)

Bermuda				98-0374481
(State or other jurisdiction of incorporation or organization)				(I.R.S. Employer Identification No.)
Waterloo House, Ground Floor
100 Pitts Bay Road,	Pembroke	HM 08,	Bermuda	(441)	278-9250
(Address of principal executive offices)				(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Exchange Act:

Title of each class	Trading Symbol (s)	Name of each exchange on which registered
Common shares, $0.0011 par value per share	ACGL	NASDAQ	Stock Market
Depositary shares, each representing a 1/1000th interest in a 5.45% Series F preferred share	ACGLO	NASDAQ	Stock Market
Depositary shares, each representing a 1/1000th interest in a 4.55% Series G preferred share	ACGLN	NASDAQ	Stock Market

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☑ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☑     No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large Accelerated Filer ☑ Accelerated Filer ☐ Non-accelerated Filer ☐ Smaller reporting company ☐ Emerging growth company ☐

If an emerging growth company, indicate by check mark if the Registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☑

As of October 31, 2022, there were 369,873,027 common shares, $0.0011 par value per share, of the registrant outstanding.

ARCH CAPITAL GROUP LTD.

INDEX TO FORM 10-Q

		Page No.
	PART I
	Financial Information	2
Item 1.	Consolidated Financial Statements	4
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	41
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	66
Item 4.	Controls and Procedures	67
	PART II
	Other Information	67
Item 1.	Legal Proceedings	67
Item 1A.	Risk Factors	67
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	68
Item 3.	Defaults Upon Senior Securities	68
Item 4.	Mine Safety Disclosures	68
Item 5.	Other Information	68
Item 6.	Exhibits	69
	Signatures	70

ARCH CAPITAL  1 2022 THIRD QUARTER FORM 10-Q

PART I. FINANCIAL INFORMATION

Cautionary Note Regarding Forward-Looking Statements 

The Private Securities Litigation Reform Act of 1995 (“PSLRA”) provides a “safe harbor” for forward-looking statements. This report or any other written or oral statements made by or on behalf of us may include forward-looking statements, which reflect our current views with respect to future events and financial performance. All statements other than statements of historical fact included in or incorporated by reference in this report are forward-looking statements. Forward-looking statements, for purposes of the PSLRA or otherwise, can generally be identified by the use of forward-looking terminology such as “may,” “will,” “expect,” “intend,” “estimate,” “anticipate,” “believe” or “continue” and similar statements of a future or forward-looking nature or their negative or variations or similar terminology.

Forward-looking statements involve our current assessment of risks and uncertainties. Actual events and results may differ materially from those expressed or implied in these statements. Important factors that could cause actual events or results to differ materially from those indicated in such statements are discussed below and elsewhere in this report and in our periodic reports filed with the Securities and Exchange Commission (the “SEC”), and include:

•our ability to successfully implement our business strategy during “soft” as well as “hard” markets;

•acceptance of our business strategy, security and financial condition by rating agencies and regulators, as well as by brokers and our insureds and reinsureds;

•our ability to consummate acquisitions and integrate the business we have acquired or may acquire into our existing operations;

•our ability to maintain or improve our ratings, which may be affected by our ability to raise additional equity or debt financings, by ratings agencies’ existing or new policies and practices, as well as other factors described herein;

•general economic and market conditions (including inflation, interest rates, unemployment, housing prices, foreign currency exchange rates, prevailing credit terms and the depth and duration of a recession, including those resulting from COVID-19) and conditions specific to the reinsurance and insurance markets in which we operate;

•competition, including increased competition, on the basis of pricing, capacity (including alternative sources of capital), coverage terms, or other factors;

•developments in the world’s financial and capital markets and our access to such markets;

•our ability to successfully enhance, integrate and maintain operating procedures (including information technology) to effectively support our current and new business;

•the loss and addition of key personnel;

•material differences between actual and expected assessments for guaranty funds and mandatory pooling arrangements;

•accuracy of those estimates and judgments utilized in the preparation of our financial statements, including those related to revenue recognition, insurance and other reserves, reinsurance recoverables, investment valuations, intangible assets, bad debts, income taxes, contingencies and litigation, and any determination to use the deposit method of accounting;

•greater than expected loss ratios on business written by us and adverse development on claim and/or claim expense liabilities related to business written by our insurance and reinsurance subsidiaries;

•the adequacy of the Company’s loss reserves;

•severity and/or frequency of losses;

•greater frequency or severity of unpredictable natural and man-made catastrophic events;

•claims for natural or man-made catastrophic events or severe economic events in our insurance, reinsurance and mortgage businesses could cause large losses and substantial volatility in our results of operations;

•the effect of climate change on our business;

•the effect of contagious disease (including COVID-19) on our business;

•acts of terrorism, political unrest and other hostilities or other unforecasted and unpredictable events;

ARCH CAPITAL  2 2022 THIRD QUARTER FORM 10-Q

•availability to us of reinsurance to manage our gross and net exposures and the cost of such reinsurance;

•the failure of reinsurers, managing general agents, third party administrators or others to meet their obligations to us;

•the timing of loss payments being faster or the receipt of reinsurance recoverables being slower than anticipated by us;

•our investment performance, including legislative or regulatory developments that may adversely affect the fair value of our investments;

•changes in general economic conditions, including sovereign debt concerns or downgrades of U.S. securities by credit rating agencies, which could affect our business, financial condition and results of operations;

•changes in the method for determining the London Inter-bank Offered Rate (“LIBOR”) and the replacement of LIBOR with alternative benchmark rates;

•the volatility of our shareholders’ equity from foreign currency fluctuations, which could increase due to us not matching portions of our projected liabilities in foreign currencies with investments in the same currencies;

•changes in accounting principles or policies or in our application of such accounting principles or policies;

•changes in the political environment of certain countries in which we operate or underwrite business;

•a disruption caused by cyber-attacks or other technology breaches or failures on us or our business partners and service providers, which could negatively impact our business and/or expose us to litigation;

•statutory or regulatory developments, including as to tax matters and insurance and other regulatory matters such as the adoption of proposed legislation that would affect Bermuda-headquartered companies and/or Bermuda-based insurers or reinsurers and/or changes in regulations or tax laws applicable to us, our subsidiaries, brokers or customers, including new guidance implementing the Tax Cuts and Jobs Act of 2017 and the possible implementation of the Organization for Economic Cooperation and Development (“OECD”) Pillar I and Pillar II initiatives; and

•the other matters set forth under Item 1A “Risk Factors”, Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and other sections of our Annual Report on Form 10-K for the year ended December 31, 2021, as well as the other factors set forth in our other documents on file with the SEC, and management’s response to any of the aforementioned factors.

All subsequent written and oral forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by these cautionary statements. The foregoing review of important factors should not be construed as exhaustive and should be read in conjunction with other cautionary statements that are included herein or elsewhere. We undertake no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events or otherwise. 

ARCH CAPITAL  3 2022 THIRD QUARTER FORM 10-Q

ITEM 1. CONSOLIDATED FINANCIAL STATEMENTS

	Page No.
Report of Independent Registered Public Accounting Firm	5
Consolidated Balance Sheets
September 30, 2022 and December 31, 2021 (unaudited)	6
Consolidated Statements of Income
For the three and nine month periods ended September 30, 2022 and 2021 (unaudited)	7
Consolidated Statements of Comprehensive Income
For the three and nine month periods ended September 30, 2022 and 2021 (unaudited)	8
Consolidated Statements of Changes in Shareholders’ Equity
For the three and nine month periods ended September 30, 2022 and 2021 (unaudited)	9
Consolidated Statements of Cash Flows
For the nine month periods ended September 30, 2022 and 2021 (unaudited)	10
Notes to Consolidated Financial Statements (unaudited)
Note 1 - Basis of Presentation and Recent Accounting Pronouncements	11
Note 2 - Share Transactions	11
Note 3 - Earnings Per Common Share	13
Note 4 - Segment Information	14
Note 5 - Reserve for Losses and Loss Adjustment Expenses	19
Note 6 - Allowance for Expected Credit Losses	22
Note 7 - Investment Information	24
Note 8 - Fair Value	30
Note 9 - Derivative Instruments	36
Note 10 - Commitments and Contingencies	37
Note 11 - Variable Interest Entities and Noncontrolling Interests	37
Note 12 - Other Comprehensive Income (Loss)	39
Note 13 - Income Taxes	40
Note 14 - Legal Proceedings	40
Note 15 - Transactions with Related Parties	40

ARCH CAPITAL  4 2022 THIRD QUARTER FORM 10-Q

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Shareholders of Arch Capital Group Ltd.

Results of Review of Interim Financial Statements

We have reviewed the accompanying consolidated balance sheet of Arch Capital Group Ltd. and its subsidiaries (the “Company”) as of September 30, 2022, and the related consolidated statements of income, comprehensive income, and changes in shareholders’ equity for the three-month and nine-month periods ended September 30, 2022 and 2021, and the consolidated statements of cash flows for the nine-month periods ended September 30, 2022 and 2021, including the related notes (collectively referred to as the “interim financial statements”). Based on our reviews, we are not aware of any material modifications that should be made to the accompanying interim financial statements for them to be in conformity with accounting principles generally accepted in the United States of America.

We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheet of the Company as of December 31, 2021, and the related consolidated statements of income, comprehensive income, changes in shareholders’ equity, and cash flows for the year then ended (not presented herein), and in our report dated February 25, 2022, we expressed an unqualified opinion on those consolidated financial statements. In our opinion, the information set forth in the accompanying consolidated balance sheet as of December 31, 2021, is fairly stated, in all material respects, in relation to the consolidated balance sheet from which it has been derived.

Basis for Review Results

These interim financial statements are the responsibility of the Company’s management. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB. We conducted our review in accordance with the standards of the PCAOB. A review of interim financial information consists principally of applying analytical procedures and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the PCAOB, the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

/s/ PricewaterhouseCoopers LLP

New York, New York

November 3, 2022

ARCH CAPITAL  5 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(U.S. dollars in thousands, except share data)

	(Unaudited)
	September 30, 2022		December 31, 2021
Assets
Investments:
Fixed maturities available for sale, at fair value (amortized cost: $19,913,055 and $17,973,823; net of allowance for credit losses: $45,993 and $2,883)	$	18,120,727	$	17,998,109
Short-term investments available for sale, at fair value (amortized cost: $1,941,071 and $1,734,738; net of allowance for credit losses: $0 and $0)	1,940,857		1,734,716
Equity securities, at fair value	809,869		1,804,170
Other investments, at fair value	1,578,751		1,973,550
Investments accounted for using the equity method	3,565,946		3,077,611
Total investments	26,016,150		26,588,156
Cash	813,583		858,668
Accrued investment income	116,263		85,453
Investment in operating affiliates	891,212		1,135,655
Premiums receivable (net of allowance for credit losses: $38,229 and $39,958)	3,579,380		2,633,280
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses (net of allowance for credit losses: $17,366 and $13,230)	6,356,456		5,880,735
Contractholder receivables (net of allowance for credit losses: $2,360 and $3,437)	1,735,730		1,828,691
Ceded unearned premiums	2,115,539		1,729,455
Deferred acquisition costs	1,122,711		901,841
Receivable for securities sold	27,042		60,179
Goodwill and intangible assets	806,655		944,983
Other assets	2,756,383		2,453,849
Total assets	$	46,337,104	$	45,100,945
Liabilities
Reserve for losses and loss adjustment expenses	$	19,288,291	$	17,757,156
Unearned premiums	7,271,279		6,011,942
Reinsurance balances payable	1,669,592		1,583,253
Contractholder payables	1,738,089		1,832,127
Collateral held for insured obligations	254,720		242,352
Senior notes	2,725,153		2,724,394
Payable for securities purchased	174,769		64,850
Other liabilities	1,411,193		1,329,742
Total liabilities	34,533,086		31,545,816
Commitments and Contingencies
Redeemable noncontrolling interests	8,908		9,233
Shareholders' Equity
Non-cumulative preferred shares	830,000		830,000
Common shares ($0.0011 par, shares issued: 587,134,047 and 583,289,850)	652		648
Additional paid-in capital	2,186,599		2,085,075
Retained earnings	15,042,561		14,455,868
Accumulated other comprehensive income (loss), net of deferred income tax	(1,891,827)		(64,600)
Common shares held in treasury, at cost (shares: 217,812,057 and 204,365,956)	(4,372,875)		(3,761,095)
Total shareholders' equity available to Arch	11,795,110		13,545,896
Total liabilities, noncontrolling interests and shareholders' equity	$	46,337,104	$	45,100,945

See Notes to Consolidated Financial Statements

ARCH CAPITAL 6 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME

(U.S. dollars in thousands, except share data)

	(Unaudited)				(Unaudited)
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Revenues
Net premiums earned	$	2,470,750	$	1,929,337	6,917,158		5,998,668
Net investment income	128,640		88,195		315,468		298,664
Net realized gains (losses)	(183,673)		(25,040)		(742,666)		320,328
Other underwriting income	3,077		7,274		11,944		18,913
Equity in net income (loss) of investment funds accounted for using the equity method	(18,861)		105,398		75,505		299,270
Other income (loss)	(13,684)		(3,960)		(34,486)		1,151
Total revenues	2,386,249		2,101,204		6,542,923		6,936,994
Expenses
Losses and loss adjustment expenses	1,682,696		1,226,019		3,786,187		3,588,950
Acquisition expenses	447,587		306,015		1,239,065		945,639
Other operating expenses	274,747		230,832		842,082		736,808
Corporate expenses	17,710		19,672		77,662		61,007
Amortization of intangible assets	26,104		20,135		80,478		49,823
Interest expense	33,063		33,176		98,566		107,222
Net foreign exchange (gains) losses	(90,509)		(36,078)		(182,129)		(38,366)
Total expenses	2,391,398		1,799,771		5,941,911		5,451,083
Income (loss) before income taxes and income (loss) from operating affiliates	(5,149)		301,433		601,012		1,485,911
Income tax (expense) benefit	14,900		(4,137)		(19,042)		(94,176)
Income (loss) from operating affiliates	8,507		124,119		37,665		224,052
Net income (loss)	$	18,258	$	421,415	$	619,635	$	1,615,787
Net (income) loss attributable to noncontrolling interests	(1,157)		(1,473)		(2,390)		(82,203)
Net income (loss) available to Arch	17,101		419,942		617,245		1,533,584
Preferred dividends	(10,184)		(16,090)		(30,552)		(38,159)
Loss on redemption of preferred shares	—		(15,101)		—		(15,101)
Net income (loss) available to Arch common shareholders	$	6,917	$	388,751	$	586,693	$	1,480,324
Net income per common share and common share equivalent
Basic	$	0.02	$	1.00	$	1.59	$	3.74
Diluted	$	0.02	$	0.98	$	1.55	$	3.66
Weighted average common shares and common share equivalents outstanding
Basic	365,190,527		389,274,220		369,525,348		395,899,591
Diluted	373,727,277		397,903,347		378,373,180		404,260,485

See Notes to Consolidated Financial Statements

ARCH CAPITAL 7 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(U.S. dollars in thousands)

	(Unaudited)				(Unaudited)
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Comprehensive Income
Net income (loss)	$	18,258	$	421,415	$	619,635	$	1,615,787
Other comprehensive income (loss), net of deferred income tax
Unrealized appreciation (decline) in value of available-for-sale investments:
Unrealized holding gains (losses) arising during period	(609,759)		(95,923)		(1,892,119)		(279,102)
Reclassification of net realized (gains) losses, included in net income (loss)	46,585		(62,654)		206,573		(120,504)
Foreign currency translation adjustments	(70,388)		(31,710)		(141,681)		(54,089)
Comprehensive income (loss)	(615,304)		231,128		(1,207,592)		1,162,092
Net (income) loss attributable to noncontrolling interests	(1,157)		(1,473)		(2,390)		(82,203)
Other comprehensive (income) loss attributable to noncontrolling interests	—		9,423		—		13,983
Comprehensive income (loss) available to Arch	$	(616,461)	$	239,078	$	(1,209,982)	$	1,093,872

See Notes to Consolidated Financial Statements

ARCH CAPITAL 8 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY

(U.S. dollars in thousands)

	(Unaudited)				(Unaudited)
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Non-cumulative preferred shares
Balance at beginning of period	$	830,000	$	1,280,000	$	830,000	$	780,000
Preferred shares issued	—		—		—		500,000
Preferred shares redeemed	—		(450,000)		—		(450,000)
Balance at beginning and end of period	$	830,000	$	830,000	$	830,000	$	830,000
Common shares
Balance at beginning of period	652		647		648		643
Common shares issued, net	—		1		4		5
Balance at end of period	652		648		652		648
Additional paid-in capital
Balance at beginning of period	2,170,661		2,028,919		2,085,075		1,977,794
Amortization of share-based compensation	13,518		14,216		80,023		71,279
Issue costs on preferred shares	—		—		—		(14,179)
Reversal of issue costs on preferred shares redeemed	—		15,101		—		15,101
Other changes	2,420		3,670		21,501		11,911
Balance at end of period	2,186,599		2,061,906		2,186,599		2,061,906
Retained earnings
Balance at beginning of period	15,035,644		13,454,036		14,455,868		12,362,463
Net income (loss)	18,258		421,415		619,635		1,615,787
Net (income) loss attributable to noncontrolling interests	(1,157)		(1,473)		(2,390)		(82,203)
Preferred share dividends	(10,184)		(16,090)		(30,552)		(38,159)
Loss on redemption of preferred shares	—		(15,101)		—		(15,101)
Balance at end of period	15,042,561		13,842,787		15,042,561		13,842,787
Accumulated other comprehensive income (loss), net of deferred income tax
Balance at beginning of period	(1,258,265)		230,048		(64,600)		488,895
Unrealized appreciation (decline) in value of available-for-sale investments, net of deferred income tax:
Balance at beginning of period	(1,108,886)		264,702		13,486		501,295
Unrealized holding gains (losses) during period, net of reclassification adjustment	(563,174)		(158,577)		(1,685,546)		(399,606)
Unrealized holding gains (losses) during period attributable to noncontrolling interests	—		10,752		—		15,188
Balance at end of period	(1,672,060)		116,877		(1,672,060)		116,877
Foreign currency translation adjustments, net of deferred income tax:
Balance at beginning of period	(149,379)		(34,654)		(78,086)		(12,400)
Foreign currency translation adjustments	(70,388)		(31,710)		(141,681)		(54,089)
Foreign currency translation adjustments attributable to noncontrolling interests	—		(1,329)		—		(1,204)
Balance at end of period	(219,767)		(67,693)		(219,767)		(67,693)
Balance at end of period	(1,891,827)		49,184		(1,891,827)		49,184
Common shares held in treasury, at cost
Balance at beginning of period	(4,361,126)		(3,007,578)		(3,761,095)		(2,503,909)
Shares repurchased for treasury	(11,749)		(389,421)		(611,780)		(893,090)
Balance at end of period	(4,372,875)		(3,396,999)		(4,372,875)		(3,396,999)
Total shareholders’ equity	$	11,795,110	$	13,387,526	$	11,795,110	$	13,387,526

See Notes to Consolidated Financial Statements

ARCH CAPITAL 9 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(U.S. dollars in thousands)

	(Unaudited)
	Nine Months Ended
	September 30,
	2022		2021
Operating Activities
Net income (loss)	$	619,635	$	1,615,787
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Net realized (gains) losses	742,680		(367,313)
Equity in net (income) or loss of investment funds accounted for using the equity method and other income or loss	106,405		(372,650)
Amortization of intangible assets	80,478		49,823
Share-based compensation	80,029		72,303
Changes in:
Reserve for losses and loss adjustment expenses, net of unpaid losses and loss adjustment expenses recoverable	1,553,084		1,548,211
Unearned premiums, net of ceded unearned premiums	1,125,395		985,242
Premiums receivable	(1,095,741)		(847,098)
Deferred acquisition costs	(242,377)		(247,966)
Reinsurance balances payable	128,418		618,571
Other items, net	(264,289)		(427,359)
Net cash provided by operating activities	2,833,717		2,627,551
Investing Activities
Purchases of fixed maturity investments	(13,065,302)		(29,870,023)
Purchases of equity securities	(786,733)		(978,951)
Purchases of other investments	(1,270,099)		(1,350,056)
Proceeds from sales of fixed maturity investments	9,990,418		30,067,792
Proceeds from sales of equity securities	1,539,808		695,633
Proceeds from sales, redemptions and maturities of other investments	1,075,679		1,487,919
Proceeds from redemptions and maturities of fixed maturity investments	577,864		1,234,412
Net settlements of derivative instruments	(106,347)		(67,830)
Net (purchases) sales of short-term investments	(151,980)		(1,172,798)
Purchase of operating affiliate	—		(753,916)
Impact of the deconsolidation of the variable interest entity	—		(349,202)
Purchases of fixed assets	(38,383)		(34,407)
Other	128,354		(361,857)
Net cash used for investing activities	(2,106,721)		(1,453,284)
Financing Activities
Proceeds from issuance of preferred shares, net	—		485,821
Redemption of preferred shares	—		(450,000)
Purchases of common shares under share repurchase program	(585,823)		(872,197)
Proceeds from common shares issued, net	(2,863)		281
Third party investment in non-redeemable noncontrolling interests	—		15,971
Dividends paid to redeemable noncontrolling interests	—		(1,907)
Other	(84,639)		(21,752)
Preferred dividends paid	(30,552)		(38,096)
Net cash used for financing activities	(703,877)		(881,879)
Effects of exchange rate changes on foreign currency cash and restricted cash	(79,566)		(34,023)
Increase (decrease) in cash and restricted cash	(56,447)		258,365
Cash and restricted cash, beginning of year	1,314,771		1,290,544
Cash and restricted cash, end of period	$	1,258,324	$	1,548,909

See Notes to Consolidated Financial Statements

ARCH CAPITAL 10 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

1.    Basis of Presentation and Recent Accounting Pronouncements

General

Arch Capital Group Ltd. (“Arch Capital”) is a public listed Bermuda exempted company which provides insurance, reinsurance and mortgage insurance on a worldwide basis through its wholly-owned subsidiaries. As used herein, the “Company” means Arch Capital and its subsidiaries. The Company’s consolidated financial statements through June 30, 2021 included the results of Somers Group Holdings Ltd. (formerly Watford Holdings Ltd.) and its wholly owned subsidiaries (“Somers”). Effective July 1, 2021, Somers is wholly owned by Greysbridge Holdings Ltd., (“Greysbridge”) and Greysbridge is owned 40% by the Company, 30% by certain investment funds managed by Kelso & Company (“Kelso”) and 30% by certain investment funds managed by Warburg Pincus LLC (“Warburg”). Based on the governing documents of Greysbridge, the Company concluded that, while it retains significant influence over Somers, Somers no longer constitutes a variable interest entity. Accordingly, effective July 1, 2021, Arch no longer consolidates the results of Somers in its consolidated financial statements and footnotes. See note 11.

Basis of Presentation

The interim consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). All significant intercompany transactions and balances have been eliminated in consolidation. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates and assumptions. In the opinion of management, the accompanying unaudited interim consolidated financial statements reflect all adjustments (consisting of normally recurring accruals) necessary for a fair statement of results on an interim basis. The results of any interim period are not necessarily indicative of the results for a full year or any future periods.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted; however, management believes that the disclosures are adequate to make the information presented not misleading. This report should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2021

(“2021 Form 10-K”), including the Company’s audited consolidated financial statements and related notes.

The Company has reclassified the presentation of certain prior year information to conform to the current presentation. Such reclassifications had no effect on the Company’s net income, comprehensive income, shareholders’ equity or cash flows. Tabular amounts are in U.S. Dollars in thousands, except share amounts, unless otherwise noted.

Recent Accounting Pronouncements

Inflation Reduction Act of 2022

On August 16, 2022, the U.S. government enacted the Inflation Reduction Act of 2022, which among other things implements a 15% minimum tax on book income of certain large corporations, a 1% excise tax on net stock repurchases and several tax incentives to promote clean energy. The effective date of these provisions is January 1, 2023. Based on its current analysis of the provisions, the Company does not expect that this legislation will have a material effect on the Company’s consolidated financial statements.

Recently Issued Accounting Standards Adopted

For information regarding additional accounting standards that the Company has not yet adopted, see note 3(s), “Significant Accounting Policies—Recent Accounting Pronouncements,” of the notes to consolidated financial statements in the Company’s 2021 Form 10-K.

2.    Share Transactions

Share Repurchases 

The board of directors of Arch Capital has authorized the investment in Arch Capital’s common shares through a share repurchase program. Since the inception of the share repurchase program, Arch Capital has repurchased 433.6 million common shares for an aggregate purchase price of $5.87 billion. For the nine months ended September 30, 2022, Arch Capital repurchased 12.9 million shares under the share repurchase program with an aggregate purchase price of $585.8 million. At September 30, 2022, $596.4 million of share repurchases were available under the program, which may be effected from time to time in open market or privately negotiated transactions. The timing and amount of the repurchase transactions under this program will depend on a variety of factors, including market conditions and corporate and regulatory considerations.

ARCH CAPITAL  11 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

The 2022 Long-Term Incentive and Share Award Plan (the“2022 Plan”)

The 2022 Plan became effective as of May 4, 2022 following approval by shareholders of the Company. The 2022 Plan provides for the issuance of stock options, stock appreciation rights, restricted shares, restricted share units payable in common shares or cash, dividend equivalents, performance shares and performance units and other share-based awards to Arch Capital’s eligible employees and directors. The number of common shares reserved for grants under the 2022 Plan, subject to anti-dilution adjustments in the event of certain changes in Arch Capital’s capital structure, is 9,000,000; provided, that no more than 6,000,000 common shares may be issued as incentive stock options under Section 422 of the Code. The 2022 Plan will terminate as to future awards on February 25, 2032. At September 30, 2022, 9,000,000 shares are available for future issuance.

Series G Preferred Shares

In June 2021, Arch Capital completed a $500 million underwritten public offering of 20.0 million depositary shares (the “Depositary Shares”), each of which represents a 1/1,000th interest in a share of its 4.55% Non-Cumulative Preferred Shares, Series G $0.01 par value and $25,000 liquidation preference per share (equivalent to $25 liquidation preference per Depositary Share) (the “Series G Preferred Shares”). Each Depositary Share, evidenced by a depositary receipt, entitles the holder, through the depositary, to a proportional fractional interest in all rights and preferences of the Series G Preferred Shares represented thereby (including any dividend, liquidation, redemption and voting rights).

Holders of Series G Preferred Shares will be entitled to receive dividend payments only when, as and if declared by the Company’s board of directors or a duly authorized committee of the board. Any such dividends will be payable from, and including, the date of original issue on a noncumulative basis, quarterly in arrears on the last day of March, June, September and December of each year, at an annual rate of 4.55%. Dividends on the Series G Preferred Shares are not cumulative. The Company will be restricted from paying dividends on or repurchasing its common shares unless certain dividend payments are made on the Series G

Preferred Shares. The Company may not declare or pay a dividend on the Series G Preferred Shares under certain circumstances, including if the Company is or, after giving effect to such payment, would be in breach of applicable individual or group solvency and liquidity requirements or applicable individual or group enhanced capital requirements (“ECR”). The Series G Preferred Shares may not be redeemed at any time if the ECR would be breached immediately before or after giving effect to such redemption, unless the Company replaces the capital represented by preference shares to be redeemed with capital having equal or better capital treatment.

Except in specified circumstances relating to certain tax or corporate events, the Series G Preferred Shares are not redeemable prior to June 11, 2026. On and after that date, the Series G Preferred Shares will be redeemable at the Company’s option, in whole or in part, at a redemption price of $25,000 per share of the Series G Preferred Shares (equivalent to $25 per depositary share), plus any declared and unpaid dividends, without accumulation of any undeclared dividends to, but excluding, the redemption date.

The Depositary Shares will be redeemed if and to the extent the related Series G Preferred Shares are redeemed by the Company. Neither the Depositary Shares nor the Series G Preferred Shares have a stated maturity, nor will they be subject to any sinking fund or mandatory redemption. The Series G Preferred Shares are not convertible into any other securities. The Series G Preferred Shares do not have voting rights, except under limited circumstances.

The net proceeds from the Series G Preferred Shares offering of approximately $485.8 million were used to redeem the Company’s issued and outstanding 5.25% Series E Non-Cumulative Preferred Shares in September 2021. The preferred shares were redeemed at a redemption price equal to $25 per depositary share, plus all declared and unpaid dividends to (but excluding) the redemption date. In accordance with GAAP, following the redemption, original issuance costs related to such shares have been removed from additional paid-in capital and recorded as a “loss on redemption of preferred shares.” Such adjustment had no impact on total shareholders’ equity or cash flows.

ARCH CAPITAL  12 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

3.    Earnings Per Common Share

The following table sets forth the computation of basic and diluted earnings per common share:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Numerator:
Net income (loss)	$	18,258	$	421,415	$	619,635	$	1,615,787
Amounts attributable to noncontrolling interests	(1,157)		(1,473)		(2,390)		(82,203)
Net income (loss) available to Arch	17,101		419,942		617,245		1,533,584
Preferred dividends	(10,184)		(16,090)		(30,552)		(38,159)
Loss on redemption of preferred shares	—		(15,101)		—		(15,101)
Net income (loss) available to Arch common shareholders	$	6,917	$	388,751	$	586,693	$	1,480,324
Denominator:
Weighted average common shares and common share equivalents outstanding — basic	365,190,527		389,274,220		369,525,348		395,899,591
Effect of dilutive common share equivalents:
Nonvested restricted shares	2,351,039		2,131,915		2,171,158		1,877,930
Stock options (1)	6,185,711		6,497,212		6,676,674		6,482,964
Weighted average common shares and common share equivalents outstanding — diluted	373,727,277		397,903,347		378,373,180		404,260,485
Earnings per common share:
Basic	$	0.02	$	1.00	$	1.59	$	3.74
Diluted	$	0.02	$	0.98	$	1.55	$	3.66

(1)    Certain stock options were not included in the computation of diluted earnings per share where the exercise price of the stock options exceeded the average market price and would have been anti-dilutive or where, when applying the treasury stock method to in-the-money options, the sum of the proceeds, including unrecognized compensation, exceeded the average market price and would have been anti-dilutive. For the 2022 third quarter and 2021 third quarter, the number of stock options excluded were 774,481 and 1,948,006, respectively. For the nine months ended September 30, 2022 and 2021, the number of stock options excluded were 785,682 and 2,397,507, respectively.

ARCH CAPITAL  13 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

4.    Segment Information

The Company classifies its businesses into three underwriting segments — insurance, reinsurance and mortgage — and two other operating segments — corporate and ‘other.’ The Company determined its reportable segments using the management approach described in accounting guidance regarding disclosures about segments of an enterprise and related information. The accounting policies of the segments are the same as those used for the preparation of the Company’s consolidated financial statements. Intersegment business is allocated to the segment accountable for the underwriting results.

The Company’s insurance, reinsurance and mortgage segments each have managers who are responsible for the overall profitability of their respective segments and who are directly accountable to the Company’s chief operating decision makers, the Chief Executive Officer of Arch Capital, the Chief Financial Officer and Treasurer of Arch Capital and the President and Chief Underwriting Officer of Arch Capital. The chief operating decision makers do not assess performance, measure return on equity or make resource allocation decisions on a line of business basis. Management measures segment performance for its three underwriting segments based on underwriting income or loss. The Company does not manage its assets by underwriting segment, with the exception of goodwill and intangible assets, and accordingly, investment income is not allocated to each underwriting segment.

The insurance segment consists of the Company’s insurance underwriting units which offer specialty product lines on a worldwide basis. Product lines include: construction and national accounts; excess and surplus casualty; lenders products; professional lines; programs; property, energy, marine and aviation; travel, accident and health; and other (consisting of alternative markets, excess workers' compensation and surety business).

The reinsurance segment consists of the Company’s reinsurance underwriting units which offer specialty product lines on a worldwide basis. Product lines include: casualty; marine and aviation; other specialty; property catastrophe; property excluding property catastrophe (losses on a single risk, both excess of loss and pro rata); and other (consisting of life reinsurance, casualty clash and other).

The mortgage segment includes the Company’s U.S. primary mortgage insurance business, investment and services related to U.S. credit-risk transfer (“CRT”) which are predominately with government sponsored enterprises (“GSE’s”) and international mortgage insurance and reinsurance operations. Arch Mortgage Insurance Company and United Guaranty Residential Insurance Company (combined “Arch MI U.S.”) are approved as eligible mortgage insurers by Federal National Mortgage Association (“Fannie Mae”) and Federal Home Loan Mortgage Corporation (“Freddie Mac”), each a GSE. Arch MI U.S. also includes Arch Mortgage Guaranty Company, which is not a GSE-approved entity.

The corporate segment results include net investment income, net realized gains or losses (which includes changes in the allowance for credit losses on financial assets and net impairment losses recognized in earnings), equity in net income or loss of investments accounted for using the equity method, other income (loss), corporate expenses, transaction costs and other, amortization of intangible assets, interest expense, net foreign exchange gains or losses, income taxes, income or loss from operating affiliates and items related to the Company’s non-cumulative preferred shares. Such amounts exclude the results of the ‘other’ segment.

Through June 30, 2021, the ‘other’ segment included the results of Somers. In July 2021, the Company announced the completion of the previously disclosed acquisition of Somers by Greysbridge. Based on the governing documents of Greysbridge, the Company has concluded that, while it retains significant influence over Somers, Somers no longer constitutes a variable interest entity. Accordingly, effective July 1, 2021, Arch no longer consolidates the results of Somers in its consolidated financial statements. See note 11.

ARCH CAPITAL  14 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

The following tables summarize the Company’s underwriting income or loss by segment, together with a reconciliation of underwriting income or loss to net income available to Arch common shareholders:

	Three Months Ended
	September 30, 2022
	Insurance			Reinsurance			Mortgage			Sub-Total			Other			Total
Gross premiums written (1)	$	1,862,026		$	1,639,061		$	362,409		$	3,860,683		$	—		$	3,860,683
Premiums ceded	(493,267)			(560,225)			(86,230)			(1,136,909)			—			(1,136,909)
Net premiums written	1,368,759			1,078,836			276,179			2,723,774			—			2,723,774
Change in unearned premiums	(181,851)			(77,062)			5,889			(253,024)			—			(253,024)
Net premiums earned	1,186,908			1,001,774			282,068			2,470,750			—			2,470,750
Other underwriting income (loss)	—			452			2,625			3,077			—			3,077
Losses and loss adjustment expenses	(822,663)			(927,911)			67,878			(1,682,696)			—			(1,682,696)
Acquisition expenses	(232,469)			(208,425)			(6,693)			(447,587)			—			(447,587)
Other operating expenses	(165,499)			(62,777)			(46,471)			(274,747)			—			(274,747)
Underwriting income (loss)	$	(33,723)		$	(196,887)		$	299,407		68,797			—			68,797
Net investment income										128,640			—			128,640
Net realized gains (losses)										(183,673)			—			(183,673)
Equity in net income (loss) of investment funds accounted for using the equity method										(18,861)			—			(18,861)
Other income (loss)										(13,684)			—			(13,684)
Corporate expenses (2)										(17,634)			—			(17,634)
Transaction costs and other (2)										(76)			—			(76)
Amortization of intangible assets										(26,104)			—			(26,104)
Interest expense										(33,063)			—			(33,063)
Net foreign exchange gains (losses)										90,509			—			90,509
Income (loss) before income taxes and income (loss) from operating affiliates										(5,149)			—			(5,149)
Income tax (expense) benefit										14,900			—			14,900
Income (loss) from operating affiliates										8,507			—			8,507
Net income (loss)										18,258			—			18,258
Amounts attributable to redeemable noncontrolling interests										(1,157)			—			(1,157)
Net income (loss) available to Arch										17,101			—			17,101
Preferred dividends										(10,184)			—			(10,184)
Net income (loss) available to Arch common shareholders										$	6,917		$	—		$	6,917
Underwriting Ratios
Loss ratio	69.3		%	92.6		%	(24.1)		%	68.1		%	—		%	68.1		%
Acquisition expense ratio	19.6		%	20.8		%	2.4		%	18.1		%	—		%	18.1		%
Other operating expense ratio	13.9		%	6.3		%	16.5		%	11.1		%	—		%	11.1		%
Combined ratio	102.8		%	119.7		%	(5.2)		%	97.3		%	—		%	97.3		%
Goodwill and intangible assets	$	224,525		$	140,800		$	441,330		$	806,655		$	—		$	806,655

(1)    Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)    Certain expenses have been excluded from ‘corporate expenses’ and reflected in ‘transaction costs and other.’

ARCH CAPITAL  15 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

	Three Months Ended
	September 30, 2021
	Insurance			Reinsurance			Mortgage			Sub-Total			Other			Total
Gross premiums written (1)	$	1,596,619		$	1,251,760		$	360,934		$	3,207,415		$	—		$	3,207,415
Premiums ceded	(442,806)			(630,371)			(60,207)			(1,131,486)			—			(1,131,486)
Net premiums written	1,153,813			621,389			300,727			2,075,929			—			2,075,929
Change in unearned premiums	(215,143)			57,313			11,238			(146,592)			—			(146,592)
Net premiums earned	938,670			678,702			311,965			1,929,337			—			1,929,337
Other underwriting income (loss)	—			3,293			3,981			7,274			—			7,274
Losses and loss adjustment expenses	(668,630)			(545,846)			(11,543)			(1,226,019)			—			(1,226,019)
Acquisition expenses	(152,467)			(129,450)			(24,098)			(306,015)			—			(306,015)
Other operating expenses	(138,931)			(45,647)			(46,254)			(230,832)			—			(230,832)
Underwriting income (loss)	$	(21,358)		$	(38,948)		$	234,051		173,745			—			173,745
Net investment income										88,195			—			88,195
Net realized gains (losses)										(25,040)			—			(25,040)
Equity in net income (loss) of investment funds accounted for using the equity method										105,398			—			105,398
Other income (loss)										(3,960)			—			(3,960)
Corporate expenses (2)										(18,636)			—			(18,636)
Transaction costs and other (2)										(1,036)			—			(1,036)
Amortization of intangible assets										(20,135)			—			(20,135)
Interest expense										(33,176)			—			(33,176)
Net foreign exchange gains (losses)										36,078			—			36,078
Income (loss) before income taxes and income (loss) from operating affiliates										301,433			—			301,433
Income tax (expense) benefit										(4,137)			—			(4,137)
Income (loss) from operating affiliates										124,119			—			124,119
Net income (loss)										421,415			—			421,415
Amounts attributable to redeemable noncontrolling interests										(1,473)			—			(1,473)
Net income (loss) available to Arch										419,942			—			419,942
Preferred dividends										(16,090)			—			(16,090)
Loss on redemption of preferred shares										(15,101)			—			(15,101)
Net income (loss) available to Arch common shareholders										$	388,751		$	—		$	388,751
Underwriting Ratios
Loss ratio	71.2		%	80.4		%	3.7		%	63.5		%	—		%	63.5		%
Acquisition expense ratio	16.2		%	19.1		%	7.7		%	15.9		%	—		%	15.9		%
Other operating expense ratio	14.8		%	6.7		%	14.8		%	12.0		%	—		%	12.0		%
Combined ratio	102.2		%	106.2		%	26.2		%	91.4		%	—		%	91.4		%
Goodwill and intangible assets	$	261,103		$	176,128		$	526,091		$	963,322		$	—		$	963,322

(1)    Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)    Certain expenses have been excluded from ‘corporate expenses’ and reflected in ‘transaction costs and other.’

ARCH CAPITAL  16 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

	Nine Months Ended
	September 30, 2022
	Insurance			Reinsurance			Mortgage			Sub-Total			Other			Total
Gross premiums written (1)	$	5,286,798		$	5,151,401		$	1,099,144		$	11,531,185		$	—		$	11,531,185
Premiums ceded	(1,482,886)			(1,770,807)			(241,097)			(3,488,632)			—			(3,488,632)
Net premiums written	3,803,912			3,380,594			858,047			8,042,553			—			8,042,553
Change in unearned premiums	(488,164)			(646,421)			9,190			(1,125,395)			—			(1,125,395)
Net premiums earned	3,315,748			2,734,173			867,237			6,917,158			—			6,917,158
Other underwriting income (loss)	—			5,814			6,130			11,944			—			11,944
Losses and loss adjustment expenses	(2,053,161)			(1,920,189)			187,163			(3,786,187)			—			(3,786,187)
Acquisition expenses	(641,807)			(569,915)			(27,343)			(1,239,065)			—			(1,239,065)
Other operating expenses	(493,412)			(198,606)			(150,064)			(842,082)			—			(842,082)
Underwriting income (loss)	$	127,368		$	51,277		$	883,123		$	1,061,768		$	—		$	1,061,768
Net investment income										315,468			—			315,468
Net realized gains (losses)										(742,666)			—			(742,666)
Equity in net income (loss) of investment funds accounted for using the equity method										75,505			—			75,505
Other income (loss)										(34,486)			—			(34,486)
Corporate expenses (2)										(76,928)			—			(76,928)
Transaction costs and other (2)										(734)			—			(734)
Amortization of intangible assets										(80,478)			—			(80,478)
Interest expense										(98,566)			—			(98,566)
Net foreign exchange gains (losses)										182,129			—			182,129
Income (loss) before income taxes and income (loss) from operating affiliates										601,012			—			601,012
Income tax (expense) benefit										(19,042)			—			(19,042)
Income (loss) from operating affiliates										37,665			—			37,665
Net income (loss)										619,635			—			619,635
Amounts attributable to redeemable noncontrolling interests										(2,390)			—			(2,390)
Net income (loss) available to Arch										617,245			—			617,245
Preferred dividends										(30,552)			—			(30,552)
Net income (loss) available to Arch common shareholders										$	586,693		$	—		$	586,693
Underwriting Ratios
Loss ratio	61.9		%	70.2		%	(21.6)		%	54.7		%	—		%	54.7		%
Acquisition expense ratio	19.4		%	20.8		%	3.2		%	17.9		%	—		%	17.9		%
Other operating expense ratio	14.9		%	7.3		%	17.3		%	12.2		%	—		%	12.2		%
Combined ratio	96.2		%	98.3		%	(1.1)		%	84.8		%	—		%	84.8		%

(1)    Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)    Certain expenses have been excluded from ‘corporate expenses’ and reflected in ‘transaction costs and other.’

ARCH CAPITAL  17 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

	Nine Months Ended
	September 30, 2021
	Insurance			Reinsurance			Mortgage			Sub-Total			Other			Total
Gross premiums written (1)	$	4,381,372		$	4,080,840		$	1,143,691		$	9,602,213		$	457,465		$	9,890,912
Premiums ceded	(1,269,165)			(1,535,607)			(171,923)			(2,973,005)			(102,763)			(2,907,002)
Net premiums written	3,112,207			2,545,233			971,768			6,629,208			354,702			6,983,910
Change in unearned premiums	(488,636)			(484,607)			10,735			(962,508)			(22,734)			(985,242)
Net premiums earned	2,623,571			2,060,626			982,503			5,666,700			331,968			5,998,668
Other underwriting income (loss)	—			3,148			15,026			18,174			739			18,913
Losses and loss adjustment expenses	(1,750,257)			(1,494,539)			(85,112)			(3,329,908)			(259,042)			(3,588,950)
Acquisition expenses	(417,541)			(381,060)			(84,297)			(882,898)			(62,741)			(945,639)
Other operating expenses	(409,386)			(150,856)			(143,697)			(703,939)			(32,869)			(736,808)
Underwriting income (loss)	$	46,387		$	37,319		$	684,423		$	768,129		$	(21,945)		$	746,184
Net investment income										256,354			42,310			298,664
Net realized gains (losses)										239,690			80,638			320,328
Equity in net income (loss) of investment funds accounted for using the equity method										299,270			—			299,270
Other income (loss)										1,151			—			1,151
Corporate expenses (2)										(59,279)			—			(59,279)
Transaction costs and other (2)										(793)			(935)			(1,728)
Amortization of intangible assets										(48,925)			(898)			(49,823)
Interest expense										(98,812)			(8,410)			(107,222)
Net foreign exchange gains (losses)										39,691			(1,325)			38,366
Income (loss) before income taxes and income (loss) from operating affiliates										1,396,476			89,435			1,485,911
Income tax (expense) benefit										(93,942)			(234)			(94,176)
Income (loss) from operating affiliates										224,052			—			224,052
Net income (loss)										1,526,586			89,201			1,615,787
Amounts attributable to redeemable noncontrolling interests										(1,936)			(1,953)			(3,889)
Amounts attributable to nonredeemable noncontrolling interests										—			(78,314)			(78,314)
Net income (loss) available to Arch										1,524,650			8,934			1,533,584
Preferred dividends										(38,159)			—			(38,159)
Loss on redemption of preferred shares										(15,101)			—			(15,101)
Net income (loss) available to Arch common shareholders										$	1,471,390		$	8,934		$	1,480,324
Underwriting Ratios
Loss ratio	66.7		%	72.5		%	8.7		%	58.8		%	78.0		%	59.8		%
Acquisition expense ratio	15.9		%	18.5		%	8.6		%	15.6		%	18.9		%	15.8		%
Other operating expense ratio	15.6		%	7.3		%	14.6		%	12.4		%	9.9		%	12.3		%
Combined ratio	98.2		%	98.3		%	31.9		%	86.8		%	106.8		%	87.9		%

(1)    Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)    Certain expenses have been excluded from ‘corporate expenses’ and reflected in ‘transaction costs and other.’

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ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

5.    Reserve for Losses and Loss Adjustment Expenses

The following table represents an analysis of losses and loss adjustment expenses and a reconciliation of the beginning and ending reserve for losses and loss adjustment expenses:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Reserve for losses and loss adjustment expenses at beginning of period	$	18,194,324	$	17,196,648	$	17,757,156	$	16,513,929
Unpaid losses and loss adjustment expenses recoverable	5,686,348		4,146,020		5,599,231		4,314,855
Net reserve for losses and loss adjustment expenses at beginning of period	12,507,976		13,050,628		12,157,925		12,199,074
Net incurred losses and loss adjustment expenses relating to losses occurring in:
Current year	1,863,519		1,348,528		4,280,048		3,812,381
Prior years	(180,823)		(122,509)		(493,861)		(223,431)
Total net incurred losses and loss adjustment expenses	1,682,696		1,226,019		3,786,187		3,588,950
Net losses and loss adjustment expense reserves of acquired business (1)	—		104,307		—		104,307
Retroactive reinsurance transactions (2)	—		—		—		(183,893)
Impact of deconsolidation of Somers (3)	—		(1,460,611)		—		(1,460,611)
Net foreign exchange (gains) losses and other	(243,387)		(78,152)		(524,682)		10,818
Net paid losses and loss adjustment expenses relating to losses occurring in:
Current year	(226,575)		(208,923)		(463,847)		(432,348)
Prior years	(538,967)		(417,368)		(1,773,840)		(1,610,397)
Total net paid losses and loss adjustment expenses	(765,542)		(626,291)		(2,237,687)		(2,042,745)
Net reserve for losses and loss adjustment expenses at end of period	13,181,743		12,215,900		13,181,743		12,215,900
Unpaid losses and loss adjustment expenses recoverable	6,106,548		5,115,147		6,106,548		5,115,147
Reserve for losses and loss adjustment expenses at end of period	$	19,288,291	$	17,331,047	$	19,288,291	$	17,331,047

(1)     Represents activity related to the Company’s acquisitions in the 2021 period of the Westpac Lenders Mortgage Insurance Limited and Somerset Bridge Group Limited, Southern Rock Holdings Limited and affiliates.

(2)     During the 2021 first quarter, the Company entered into a reinsurance to close and other related agreements with Premia Managing Agency Limited (“Premia”), in connection with the 2018 and prior years of account related to the acquisition of Barbican Group Holdings Limited (“Barbican”).

(3)    See note 11.

Development on Prior Year Loss Reserves

2022 Third Quarter

During the 2022 third quarter, the Company recorded net favorable development on prior year loss reserves of $180.8 million, which consisted of $5.4 million from the insurance segment, $49.2 million from the reinsurance segment and $126.2 million from the mortgage segment.

The insurance segment’s net favorable development of $5.4 million, or 0.5 loss ratio points, for the 2022 third quarter consisted of $15.9 million of net favorable development in short-tailed lines and $10.5 million of net adverse development in medium-tailed and long-tailed lines. Net favorable development in short-tailed lines reflected $8.9 million of favorable development in property (excluding marine), primarily from 2020 and 2021 accident years (i.e.,

the year in which a loss occurred) and $5.7 million of favorable development in lenders products, primarily from the 2021 accident year. Net adverse development in medium-tailed lines included $11.3 million of adverse development in professional liability business, primarily from the 2013 to 2016 and 2020 accident years, partially offset by favorable development in marine business of $5.9 million, across most accident years. Net adverse development in long-tailed lines reflected $12.3 million related to casualty business, primarily from the 2014 and 2020 accident years, partially offset by favorable development in construction, executive assurance and other lines of business.

The reinsurance segment’s net favorable development of $49.2 million, or 4.9 loss ratio points, for the 2022 third quarter consisted of $58.1 million of net favorable development in short-tailed and medium-tailed lines and

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

$8.9 million of net adverse development in long-tailed lines. Net favorable development in short-tailed lines reflected $35.8 million of favorable development related to property other than property catastrophe business, primarily from 2015 to 2021 underwriting years (i.e., all premiums and losses attributable to contracts having an inception or renewal date within the given twelve-month period) and $12.7 million of favorable development related to property catastrophe business, primarily from the 2014 to 2017 underwriting years. Net favorable development in medium-tailed lines included $7.9 million in marine and aviation lines, across most underwriting years. Net adverse development in long-tailed lines reflected $9.5 million related to casualty business, primarily from the 2014 to 2017 underwriting years.

The mortgage segment’s net favorable development was $126.2 million, or 44.7 loss ratio points, for the 2022 third quarter, with the largest contributor being reserve releases associated with the U.S. first lien portfolio from the 2020 and 2021 accident years. The Company’s credit risk transfer, international, second lien and student loan businesses also contributed to the favorable development.

2021 Third Quarter

During the 2021 third quarter, the Company recorded net favorable development on prior year loss reserves of $122.5 million, which consisted of $5.1 million from the insurance segment, $72.3 million from the reinsurance segment and $45.1 million from the mortgage segment.

The insurance segment’s net favorable development of $5.1 million, or 0.5 loss ratio points, for the 2021 third quarter consisted of $49.0 million of net favorable development in short-tailed and long-tailed lines and $43.9 million of net adverse development in medium-tailed lines. Net favorable development in short-tailed lines reflected $5.4 million of favorable development in lenders products, primarily from the 2020 accident year, $5.4 million of favorable development from property (excluding marine), primarily from the 2020 accident year, and $5.1 million of favorable development in travel and accident, across most accident years. Net favorable development in long-tailed lines reflected $26.3 million of favorable development related to construction and national accounts, across most accident years, and $6.7 million of favorable development related to other business, including alternative markets, primarily from the 2015 to 2018 accident years. Net adverse development in medium-tailed lines included $37.0 million of adverse development in contract binding business, across most accident years, partially offset by favorable development in marine and programs, primarily from more recent accident years.

The reinsurance segment’s net favorable development of $72.3 million, or 10.7 loss ratio points, for the 2021 third quarter consisted of $65.4 million of net favorable

development in short-tailed lines and $6.9 million in medium-tailed and long-tailed lines. Net favorable development in short-tailed lines reflected $46.1 million of favorable development related to property catastrophe and property other than property catastrophe business, primarily from the 2017 to 2020 underwriting years and $18.9 million of favorable development related to other specialty, primarily from the 2012 to 2017 underwriting years. Net favorable development in medium-tailed and long-tailed lines included $4.7 million of favorable development in casualty, primarily from the 2013 and 2014 underwriting years.

The mortgage segment’s net favorable development was $45.1 million, or 14.5 loss ratio points, for the 2021 third quarter, about half of which came from U.S. primary mortgage insurance, from better than expected cure activity in pre-pandemic delinquencies and recoveries on second lien and student loans, and the other half from our CRT portfolio and international mortgage insurance.

Nine Months Ended September 30, 2022

During the nine months ended September 30, 2022, the Company recorded net favorable development on prior year loss reserves of $493.9 million, which consisted of $19.4 million from the insurance segment, $128.1 million from the reinsurance segment and $346.4 million from the mortgage segment.

The insurance segment’s net favorable development of $19.4 million, or 0.6 loss ratio points, for the 2022 period consisted of $49.1 million of net favorable development in short-tailed and $29.7 million of net adverse development in medium and long-tailed lines. Net favorable development in short-tailed lines reflected $36.5 million of favorable development in lenders products, primarily from the 2021 accident year, and $14.3 million of favorable development related to travel and accident business, primarily from the 2019 to 2021 accident years. Net adverse development in medium-tailed lines included $24.9 million of adverse development in professional liability business, primarily from the 2013 to 2015 and 2018 to 2020 accident years, and $5.5 million of adverse development in contract binding business, across most accident years, partially offset by $11.4 million of favorable development in marine business, across most accident years. Net adverse development in long-tailed lines reflected $18.0 million of adverse development related to casualty business, primarily from the 2020 and 2021 accident years, partially offset by $17.4 million of favorable development in other business, including alternative markets and excess workers’ compensation, primarily from the 2019 and prior accident years.

The reinsurance segment’s net favorable development of $128.1 million, or 4.7 loss ratio points, for the 2022 period consisted of $147.8 million of net favorable development from short and medium-tailed lines, partially offset by

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

$19.7 million of net adverse development from long-tailed lines. Net favorable development in short-tailed lines reflected $83.2 million of favorable development from property other than property catastrophe business, primarily from the 2015 to 2021 underwriting years, $22.4 million of favorable development from property catastrophe, primarily from the 2018 to 2020 underwriting years, and $19.8 million from other specialty business, primarily from the 2021 underwriting year. Net favorable development in medium-tailed lines included $22.7 million in marine and aviation lines, across most underwriting years. Net adverse development in long-tailed lines primarily reflected $19.3 million in casualty reserves, primarily from the 2021 underwriting year.

The mortgage segment’s net favorable development was $346.4 million, or 39.9 loss ratio points, for the 2022 period, with the largest contributor being reserve releases associated with the U.S. first lien portfolio from the 2020 and 2021 accident years. The Company’s credit risk transfer, international, second lien and student loan businesses also contributed to the favorable development.

Nine Months Ended September 30, 2021

During the nine months ended September 30, 2021, the Company recorded net favorable development on prior year loss reserves of $223.4 million, which consisted of $13.1 million from the insurance segment, $119.6 million from the reinsurance segment, $99.1 million from the mortgage segment, partially offset by $8.4 million of adverse development from the ‘other’ segment (activity for the six months ended June 30, 2021 prior to deconsolidation of Somers).

The insurance segment’s net favorable development of $13.1 million, or 0.5 loss ratio points, for the 2021 period consisted of $102.5 million of net favorable development in short-tailed and long-tailed lines, partially offset by $89.4 million of net adverse development in medium-tailed lines. Net favorable development of $65.3 million in short-tailed lines reflected $27.0 million of favorable development from property (excluding marine), primarily from the 2019 and 2020 accident years, $24.0 million of favorable development in lenders products, primarily from the 2020 accident year, and $14.4 million of favorable development in travel and accident, primarily from the 2017 to 2020 accident years. Net favorable development of $37.1 million in long-tailed lines included favorable development primarily related to construction, national accounts and alternative markets, primarily from the 2016 to 2019 accident years. Net adverse development in medium-tailed lines reflected $57.1 million of adverse development in contract binding business, primarily from the 2014 to 2019 accident years, $26.2 million of adverse development in professional liability business, primarily from the 2019 and 2020 accident years, and

$6.9 million of adverse development in programs business, primarily from the 2019 accident year.

The reinsurance segment’s net favorable development of $119.6 million, or 5.8 loss ratio points, for the 2021 period consisted of $139.7 million of net favorable development from short-tailed and medium-tailed lines, partially offset by $20.1 million of net adverse development from long-tailed lines. Net favorable development of $132.6 million in short-tailed lines reflected $97.1 million of favorable development from other specialty lines, primarily from the 2016 to 2019 underwriting years, and $71.7 million of favorable development from property other than property catastrophe business, primarily from the 2017 to 2020 underwriting years. Such amounts were partially offset by adverse development of $36.3 million from property catastrophe, primarily from the 2020 underwriting year. Adverse development in long-tailed lines reflected an increase in reserves from casualty, primarily from the 2018 underwriting year.

The mortgage segment’s net favorable development was $99.1 million, or 10.1 loss ratio points, for the 2021 period, which included reserve releases associated with various vintage credit risk transfer contracts that were called by the GSEs, favorable development on U.S. and international business and subrogation recoveries on second lien and student loan business.

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ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

6.    Allowance for Expected Credit Losses

Premiums Receivable

The following table provides a roll forward of the allowance for expected credit losses of the Company’s premium receivables:

	Premium Receivables, Net of Allowance		Allowance for Expected Credit Losses
Three Months Ended September 30, 2022
Balance at beginning of period	$	3,634,182	$	38,170
Change for provision of expected credit losses (1)			59
Balance at end of period	$	3,579,380	$	38,229
Three Months Ended September 30, 2021
Balance at beginning of period	$	2,866,578	$	35,979
Change for provision of expected credit losses (1)			2,736
Balance at end of period	$	2,807,720	$	38,715
Nine Months Ended September 30, 2022
Balance at beginning of period	$	2,633,280	$	39,958
Change for provision of expected credit losses (1)			(1,729)
Balance at end of period	$	3,579,380	$	38,229
Nine Months Ended September 30, 2021
Balance at beginning of period	$	2,064,586	$	37,781
Change for provision of expected credit losses (1)			934
Balance at end of period	$	2,807,720	$	38,715

(1)Amounts deemed uncollectible are written-off in operating expenses. For the 2022 third quarter and 2021 third quarter, amounts written off were $1.9 million and $1.2 million, respectively. For the nine months ended September 30, 2022 and 2021 period, amounts written off were $6.6 million and $2.4 million, respectively.

Reinsurance Recoverables

The following table provides a roll forward of the allowance for expected credit losses of the Company’s reinsurance recoverables:

	Reinsurance Recoverables, Net of Allowance		Allowance for Expected Credit Losses
Three Months Ended September 30, 2022
Balance at beginning of period	$	5,938,511	$	14,740
Change for provision of expected credit losses			2,626
Balance at end of period	$	6,356,456	$	17,366
Three Months Ended September 30, 2021
Balance at beginning of period	$	4,314,515	$	11,029
Change for provision of expected credit losses			1,802
Balance at end of period	$	5,358,852	$	12,831
Nine Months Ended September 30, 2022
Balance at beginning of period	$	5,880,735	$	13,230
Change for provision of expected credit losses			4,136
Balance at end of period	$	6,356,456	$	17,366
Nine Months Ended September 30, 2021
Balance at beginning of period	$	4,500,802	$	11,636
Change for provision of expected credit losses			1,195
Balance at end of period	$	5,358,852	$	12,831

ARCH CAPITAL  22 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

The following table summarizes the Company’s reinsurance recoverables on paid and unpaid losses (not including ceded unearned premiums):

	September 30,			December 31
	2022			2021
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses	$	6,356,456		$	5,880,735
% due from carriers with A.M. Best rating of “A-” or better	69.5		%	69.7		%
% due from all other rated carriers	0.1		%	0.1		%
% due from all other carriers with no A.M. Best rating (1)	30.4		%	30.2		%
Largest balance due from any one carrier as % of total shareholders’ equity	9.1		%	6.7		%

(1)    At September 30, 2022 and December 31, 2021 over 95% and 91% of such amount were collateralized through reinsurance trusts, funds withheld arrangements, letters of credit or other, respectively.

Contractholder Receivables

The following table provides a roll forward of the allowance for expected credit losses of the Company’s contractholder receivables:

	Contract-holder Receivables, Net of Allowance		Allowance for Expected Credit Losses
Three Months Ended September 30, 2022
Balance at beginning of period	$	1,758,018	$	3,005
Change for provision of expected credit losses			(645)
Balance at end of period	$	1,735,730	$	2,360
Three Months Ended September 30, 2021
Balance at beginning of period	$	1,882,948	$	4,471
Change for provision of expected credit losses			(987)
Balance at end of period	1,824,990		$	3,484
Nine Months Ended September 30, 2022
Balance at beginning of period	$	1,828,691	$	3,437
Change for provision of expected credit losses			(1,077)
Balance at end of period	$	1,735,730	$	2,360
Nine Months Ended September 30, 2021
Balance at beginning of period	$	1,986,924	$	8,638
Change for provision of expected credit losses			(5,154)
Balance at end of period	1,824,990		$	3,484

ARCH CAPITAL  23 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

7.    Investment Information

Available For Sale Investments

The following table summarizes the fair value and cost or amortized cost of the Company’s securities classified as available for sale:

	Estimated Fair Value		Gross Unrealized Gains		Gross Unrealized Losses		Allowance for Expected Credit Losses		Cost or Amortized Cost
September 30, 2022
Fixed maturities:
Corporate bonds	$	7,096,269	$	51,777	$	(895,365)	$	(35,657)	$	7,975,514
Residential mortgage backed securities	763,371		7,561		(84,183)		2		839,991
Municipal bonds	407,724		5,437		(37,692)		(99)		440,078
Commercial mortgage backed securities	1,064,238		3,079		(50,010)		(1,583)		1,112,752
U.S. government and government agencies	5,126,407		36,074		(400,784)		—		5,491,117
Non-U.S. government securities	2,073,170		9,315		(287,583)		(1,720)		2,353,158
Asset backed securities	1,589,548		1,076		(105,037)		(6,936)		1,700,445
Total	18,120,727		114,319		(1,860,654)		(45,993)		19,913,055
Short-term investments	1,940,857		1,419		(1,633)		—		1,941,071
Total	$	20,061,584	$	115,738	$	(1,862,287)	$	(45,993)	$	21,854,126
December 31, 2021
Fixed maturities:
Corporate bonds	$	6,553,333	$	104,170	$	(69,194)	$	(2,037)	$	6,520,394
Residential mortgage backed securities	408,477		2,825		(5,410)		(48)		411,110
Municipal bonds	404,666		18,724		(1,409)		(2)		387,353
Commercial mortgage backed securities	1,046,484		1,740		(3,117)		(6)		1,047,867
U.S. government and government agencies	4,772,764		10,076		(45,967)		—		4,808,655
Non-U.S. government securities	2,120,294		54,048		(34,749)		(82)		2,101,077
Asset backed securities	2,692,091		6,540		(11,108)		(708)		2,697,367
Total	17,998,109		198,123		(170,954)		(2,883)		17,973,823
Short-term investments	1,734,716		568		(590)		—		1,734,738
Total	$	19,732,825	$	198,691	$	(171,544)	$	(2,883)	$	19,708,561

ARCH CAPITAL  24 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

The following table summarizes, for all available for sale securities in an unrealized loss position, the fair value and gross unrealized loss by length of time the security has been in a continual unrealized loss position:

	Less than 12 Months				12 Months or More				Total
	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
September 30, 2022
Fixed maturities:
Corporate bonds	$	5,596,229	$	(625,774)	$	1,470,800	$	(269,591)	$	7,067,029	$	(895,365)
Residential mortgage backed securities	620,572		(63,732)		93,902		(20,451)		714,474		(84,183)
Municipal bonds	373,219		(36,039)		9,399		(1,653)		382,618		(37,692)
Commercial mortgage backed securities	995,680		(49,215)		34,445		(795)		1,030,125		(50,010)
U.S. government and government agencies	4,205,475		(303,805)		715,347		(96,979)		4,920,822		(400,784)
Non-U.S. government securities	1,728,965		(221,540)		301,298		(66,043)		2,030,263		(287,583)
Asset backed securities	1,193,405		(74,885)		310,838		(30,152)		1,504,243		(105,037)
Total	14,713,545		(1,374,990)		2,936,029		(485,664)		17,649,574		(1,860,654)
Short-term investments	227,201		(1,633)		—		—		227,201		(1,633)
Total	$	14,940,746	$	(1,376,623)	$	2,936,029	$	(485,664)	$	17,876,775	$	(1,862,287)
December 31, 2021
Fixed maturities:
Corporate bonds	$	3,639,582	$	(63,938)	$	98,867	$	(5,256)	$	3,738,449	$	(69,194)
Residential mortgage backed securities	222,176		(3,545)		46,809		(1,865)		268,985		(5,410)
Municipal bonds	26,665		(385)		16,361		(1,024)		43,026		(1,409)
Commercial mortgage backed securities	675,603		(2,805)		5,908		(312)		681,511		(3,117)
U.S. government and government agencies	4,211,621		(44,180)		33,373		(1,787)		4,244,994		(45,967)
Non-U.S. government securities	1,511,301		(31,983)		62,957		(2,766)		1,574,258		(34,749)
Asset backed securities	1,667,002		(9,853)		33,082		(1,255)		1,700,084		(11,108)
Total	11,953,950		(156,689)		297,357		(14,265)		12,251,307		(170,954)
Short-term investments	284,733		(590)		—		—		284,733		(590)
Total	$	12,238,683	$	(157,279)	$	297,357	$	(14,265)	$	12,536,040	$	(171,544)

At September 30, 2022, on a lot level basis, approximately 9,590 security lots out of a total of approximately 11,500 security lots were in an unrealized loss position and the largest single unrealized loss from a single lot in the Company’s fixed maturity portfolio was $7.2 million. At December 31, 2021, on a lot level basis, approximately 4,700 security lots out of a total of approximately 10,240 security lots were in an unrealized loss position and the largest single unrealized loss from a single lot in the Company’s fixed maturity portfolio was $1.1 million.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

The contractual maturities of the Company’s fixed maturities are shown in the following table. Expected maturities, which are management’s best estimates, will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	September 30, 2022				December 31, 2021
Maturity	Estimated Fair Value		Amortized Cost		Estimated Fair Value		Amortized Cost
Due in one year or less	$	579,231	$	599,970	$	300,889	$	299,772
Due after one year through five years	10,029,151		10,808,495		8,355,255		8,339,387
Due after five years through 10 years	3,856,180		4,495,113		4,689,155		4,684,393
Due after 10 years	239,008		356,289		505,758		493,927
	14,703,570		16,259,867		13,851,057		13,817,479
Residential mortgage backed securities	763,371		839,991		408,477		411,110
Commercial mortgage backed securities	1,064,238		1,112,752		1,046,484		1,047,867
Asset backed securities	1,589,548		1,700,445		2,692,091		2,697,367
Total	$	18,120,727	$	19,913,055	$	17,998,109	$	17,973,823

Equity Securities, at Fair Value

At September 30, 2022, the Company held $0.8 billion of equity securities, at fair value, compared to $1.8 billion at December 31, 2021. Such holdings include publicly traded common stocks primarily in the consumer cyclical and non-cyclical, technology, communication and financial sectors and exchange-traded funds in fixed income, equity and other sectors.

Other Investments, at Fair Value

The following table summarizes the Company’s other investments and other investable assets:

	September 30, 2022		December 31, 2021
Fixed maturities	$	530,303	$	416,698
Other investments	1,005,929		1,432,553
Short-term investments	28,614		97,806
Equity securities	13,905		26,493
Total	$	1,578,751	$	1,973,550

The following table summarizes the Company’s other investments, as detailed in the previous table, by strategy:

	September 30, 2022		December 31, 2021
Lending	$	398,789	$	536,345
Investment grade fixed income	229,262		147,810
Term loan investments	151,649		484,950
Private equity	117,856		91,126
Energy	55,250		81,692
Credit related funds	53,123		70,278
Infrastructure	—		20,352
Total	$	1,005,929	$	1,432,553

Investments Accounted For Using the Equity Method

The following table summarizes the Company’s investments accounted for using the equity method, by strategy:

	September 30, 2022		December 31, 2021
Credit related funds	$	1,135,623	$	1,022,334
Private equity	761,997		436,042
Real estate	474,666		396,395
Lending	454,196		376,649
Equities	261,650		395,090
Infrastructure	236,920		230,070
Energy	113,778		119,141
Fixed income	127,116		101,890
Total	$	3,565,946	$	3,077,611

Certain of the Company’s other investments are in investment funds for which the Company has the option to redeem at agreed upon values as described in each investment fund’s subscription agreement. Depending on the terms of the various subscription agreements, investments in investment funds may be redeemed daily, monthly, quarterly or on other terms. Two common redemption restrictions which may impact the Company’s ability to redeem these investment funds are gates and lockups. A gate is a suspension of redemptions which may be implemented by the general partner or investment manager of the fund in order to defer, in whole or in part, the redemption request in the event the aggregate amount of redemption requests exceeds a predetermined percentage of the investment fund’s net assets which may otherwise hinder the general partner or investment manager’s ability to liquidate holdings in an orderly fashion in order to generate the cash necessary to fund extraordinarily large redemption payouts. A lockup period is the initial amount of time an investor is contractually required to hold the security before having the ability to redeem. If the investment funds are eligible to be

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

redeemed, the time to redeem such fund can take weeks or months following the notification.

Limited Partnership Interests

In the normal course of its activities, the Company invests in limited partnerships as part of its overall investment strategy. Such amounts are included in ‘investments accounted for using the equity method’ and ‘investments accounted for using the fair value option.’ The Company has determined that it is not required to consolidate these investments because it is not the primary beneficiary of the funds. The Company’s maximum exposure to loss with respect to these investments is limited to the investment carrying amounts reported in the Company’s consolidated balance sheet and any unfunded commitment.

The following table summarizes investments in limited partnership interests where the Company has a variable interest by balance sheet line item:

	September 30, 2022		December 31, 2021
Investments accounted for using the equity method (1)	$	3,565,946	$	3,077,611
Investments accounted for using the fair value option (2)	120,498		170,595
Total	$	3,686,444	$	3,248,206

(1)    Aggregate unfunded commitments were $2.8 billion at September 30, 2022, compared to $2.6 billion at December 31, 2021.

(2)    Aggregate unfunded commitments were $21.5 million at September 30, 2022, compared to $18.8 million at December 31, 2021.

Net Investment Income

The components of net investment income were derived from the following sources:

	September 30,
	2022		2021
Three Months Ended
Fixed maturities	$	123,568	$	75,964
Term loans	88		1,736
Equity securities	4,261		9,867
Short-term investments	9,304		1,858
Other (1)	8,556		17,378
Gross investment income	145,777		106,803
Investment expenses	(17,137)		(18,608)
Net investment income	$	128,640	$	88,195
Nine Months Ended
Fixed maturities	$	310,963	$	255,215
Term loans	2,106		33,343
Equity securities	16,620		24,101
Short-term investments	15,999		3,603
Other (1)	26,598		51,683
Gross investment income	372,286		367,945
Investment expenses	(56,818)		(69,281)
Net investment income	$	315,468	$	298,664

(1)    Includes income distributions from investment funds and other items.

Net Realized Gains (Losses)

Net realized gains (losses), which include changes in the allowance for credit losses on financial assets and net impairment losses recognized in earnings were as follows:

	September 30,
	2022		2021
Three Months Ended
Available for sale securities:
Gross gains on investment sales	$	18,030	$	86,819
Gross losses on investment sales	(73,970)		(18,446)
Change in fair value of assets and liabilities accounted for using the fair value option:
Fixed maturities	(19,304)		(7,492)
Other investments	(17,882)		3,811
Equity securities	(584)		3,042
Short-term investments	(975)		16
Equity securities, at fair value:
Net realized gains (losses) on sales during the period	(6,401)		14,736
Net unrealized gains (losses) on equity securities still held at reporting date	(36,162)		(40,155)
Allowance for credit losses:
Investments related	8,652		(456)
Underwriting related	(4,232)		(3,985)
Derivative instruments (1)	(48,196)		(21,435)
Other	(2,649)		(41,495)
Net realized gains (losses)	$	(183,673)	$	(25,040)
Nine Months Ended
Available for sale securities:
Gross gains on investment sales	$	52,923	$	267,362
Gross losses on investment sales	(239,493)		(132,071)
Change in fair value of assets and liabilities accounted for using the fair value option:
Fixed maturities	(89,148)		19,973
Other investments	(35,203)		111,550
Equity securities	(6,021)		10,599
Short-term investments	(3,132)		648
Equity securities, at fair value:
Net realized gains (losses) on sales during the period	75,689		86,155
Net unrealized gains (losses) on equity securities still held at reporting date	(318,732)		45,400
Allowance for credit losses:
Investments related	(48,096)		(1,208)
Underwriting related	(7,676)		2,664
Derivative instruments (1)	(117,591)		(36,428)
Other	(6,186)		(54,316)
Net realized gains (losses)	$	(742,666)	$	320,328

(1)    See note 9 for information on the Company’s derivative instruments.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

Equity in Net Income (Loss) of Investment Funds Accounted for Using the Equity Method

The Company recorded a loss of $18.9 million related to investment funds accounted for using the equity method in the 2022 third quarter, compared to income of $105.4 million for the 2021 third quarter and an income of $75.5 million for the nine months ended September 30, 2022, compared to income of $299.3 million for nine months ended September 30, 2021. In applying the equity method, investments are initially recorded at cost and are subsequently adjusted based on the Company’s proportionate share of the net income or loss of the funds (which include changes in the market value of the underlying securities in the funds). Such investments are generally recorded on a one to three month lag based on the availability of reports from the investment funds.

Investments in Operating Affiliates

Investments in which the Company has significant influence over the operating and financial policies are classified as ‘investments in operating affiliates’ on the Company’s balance sheets and are accounted for under the equity method. Such investments primarily include the Company’s investment in Coface SA (“Coface”), Greysbridge and Premia. Investments in Coface and Premia are generally recorded on a three month lag, while the Company’s investment in Greysbridge is not recorded on a lag.

In 2021, the Company completed the share purchase agreement with Natixis to purchase 29.5% of the common equity of Coface, a France-based leader in the global trade credit insurance market. The consideration paid was €9.95 per share, or an aggregate €453 million (approximately

$546 million) including related fees. Income (loss) from operating affiliates reflected a one-time gain of $74.5 million realized from the acquisition. As of September 30, 2022, the Company owned approximately 29.86% of the issued shares of Coface, or 30.05% excluding treasury shares, with a carrying value of $506.7 million, compared to $630.5 million at December 31, 2021.

In July 2021, the Company announced the completion of the previously disclosed acquisition of Somers by Greysbridge for a cash purchase price of $35.00 per common share.

Effective July 1, 2021, Somers is wholly owned by Greysbridge, and Greysbridge is owned 40% by the Company, 30% by certain investment funds managed by Kelso and 30% by certain investment funds managed by Warburg. At September 30, 2022 the Company’s carrying value in Greysbridge was $277.6 million, compared to $375.7 million at December 31, 2021, which reflected the Company’s aggregate purchase price of $278.9 million along with income (loss) from operating affiliates, which included a one-time gain of $95.7 million recognized from the acquisition.

Income from operating affiliates for the 2022 third quarter was income of $8.5 million, compared to an income of $124.1 million, for the 2021 third quarter and income of $37.7 million for the nine months ended September 30, 2022, compared to income of $224.1 million for nine months ended September 30, 2021.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

Allowance for Expected Credit Losses

The following table provides a roll forward of the allowance for expected credit losses of the Company’s securities classified as available for sale:

	Structured Securities (1)		Municipal Bonds		Corporate Bonds		Total
Three Months Ended September 30, 2022
Balance at beginning of period	$	18,283	$	298	$	39,829	$	58,410
Additions for current-period provision for expected credit losses	1,782		12		1,986		3,780
Additions (reductions) for previously recognized expected credit losses	(9,767)		(211)		(2,552)		(12,530)
Reductions due to disposals	(1,780)		—		(1,887)		(3,667)
Balance at end of period	$	8,518	$	99	$	37,376	$	45,993
Three Months Ended September 30, 2021
Balance at beginning of period	$	759	$	6	$	1,359	$	2,124
Additions for current-period provision for expected credit losses	48		—		—		48
Additions (reductions) for previously recognized expected credit losses	14		(4)		395		405
Reductions due to disposals	(234)		—		(232)		(466)
Balance at end of period	$	587	$	2	$	1,522	$	2,111
Nine Months Ended September 30, 2022
Balance at beginning of period	$	802	$	2	$	2,079	$	2,883
Additions for current-period provision for expected credit losses	12,560		359		40,602		53,521
Additions (reductions) for previously recognized expected credit losses	(2,575)		(262)		(2,772)		(5,609)
Reductions due to disposals	(2,269)		—		(2,533)		(4,802)
Balance at end of period	$	8,518	$	99	$	37,376	$	45,993
Nine Months Ended September 30, 2021
Balance at beginning of period	$	1,490	$	11	$	896	$	2,397
Additions for current-period provision for expected credit losses	282		—		2,428		2,710
Additions (reductions) for previously recognized expected credit losses	(751)		(9)		(557)		(1,317)
Reductions due to disposals	(434)		—		(1,245)		(1,679)
Balance at end of period	$	587	$	2	$	1,522	$	2,111

(1)    Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

Restricted Assets

The Company is required to maintain assets on deposit, which primarily consist of fixed maturities, with various regulatory authorities to support its underwriting operations. The Company’s subsidiaries maintain assets in trust accounts as collateral for transactions with affiliated companies and also have investments in segregated portfolios primarily to provide collateral or guarantees for letters of credit to third parties. See note 18, “Commitments and Contingencies,” of the notes to consolidated financial statements in the Company’s 2021 Form 10-K.

The following table details the value of the Company’s restricted assets:

	September 30, 2022		December 31, 2021
Assets used for collateral or guarantees:
Affiliated transactions	$	4,212,521	$	4,223,955
Third party agreements	2,847,814		2,721,160
Deposits with U.S. regulatory authorities	756,368		798,100
Deposits with non-U.S. regulatory authorities	519,254		506,517
Total restricted assets	$	8,335,957	$	8,249,732

Reconciliation of Cash and Restricted Cash

The following table details reconciliation of cash and restricted cash within the Consolidated Balance Sheets:

	September 30, 2022		December 31, 2021
Cash	$	813,583	$	858,668
Restricted cash (included in ‘other assets’)	444,741		456,103
Cash and restricted cash	$	1,258,324	$	1,314,771

8.    Fair Value

Accounting guidance regarding fair value measurements addresses how companies should measure fair value when they are required to use a fair value measure for recognition or disclosure purposes under GAAP and provides a common definition of fair value to be used throughout GAAP. It defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly fashion between market participants at the measurement date. In addition, it establishes a three-level valuation hierarchy for the disclosure of fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The level in the hierarchy within which a given fair value measurement falls is determined based on the lowest level input that is significant to the measurement (Level 1 being the highest priority and Level 3 being the lowest priority).

The levels in the hierarchy are defined as follows:

Level 1:	Inputs to the valuation methodology are observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets
Level 2:	Inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument
Level 3:	Inputs to the valuation methodology are unobservable and significant to the fair value measurement

Following is a description of the valuation methodologies used for securities measured at fair value, as well as the general classification of such securities pursuant to the valuation hierarchy. The Company reviews its securities measured at fair value and discusses the proper classification of such investments with investment advisers and others.

The Company determines the existence of an active market based on its judgment as to whether transactions for the financial instrument occur in such market with sufficient frequency and volume to provide reliable pricing information. The independent pricing sources obtain market quotations and actual transaction prices for securities that have quoted prices in active markets. The Company uses quoted values and other data provided by nationally recognized independent pricing sources as inputs into its process for determining fair values of its fixed maturity investments. To validate the techniques or models used by pricing sources, the Company's review process includes, but is not limited to: (i) quantitative analysis (e.g., comparing the quarterly return for each managed portfolio to its target benchmark, with significant differences identified and investigated); (ii) a review of the average number of prices obtained in the pricing process and the range of resulting fair values; (iii) initial and ongoing evaluation of methodologies used by outside parties to calculate fair value; (iv) a comparison of the fair value estimates to the Company’s knowledge of the current market; (v) a comparison of the pricing services' fair values to other pricing services' fair values for the same investments; and (vi) periodic back-testing, which includes randomly selecting purchased or sold securities and comparing the executed prices to the fair value estimates from the pricing service. A price source hierarchy was maintained in order to determine which price source would be used (i.e., a price obtained from a pricing service with more seniority in the hierarchy will be used over a less senior one in all cases). The hierarchy prioritizes pricing services based on availability and reliability and assigns the highest priority to index providers. Based on the above

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

review, the Company will challenge any prices for a security or portfolio which are considered not to be representative of fair value. The Company did not adjust any of the prices obtained from the independent pricing sources at September 30, 2022.

In certain circumstances, when fair values are unavailable from these independent pricing sources, quotes are obtained directly from broker-dealers who are active in the corresponding markets. Such quotes are subject to the validation procedures noted above. Where quotes are unavailable, fair value is determined by the Investment Manager using quantitative and qualitative assessments such as internally modeled values. Of the $22.8 billion of financial assets and liabilities measured at fair value at September 30, 2022, approximately $12.6 million, or 0.1%, were priced using non-binding broker-dealer quotes or modeled valuations. Of the $23.8 billion of financial assets and liabilities measured at fair value at December 31, 2021, approximately $7.7 million, or 0.0%, were priced using non-binding broker-dealer quotes or modeled valuations.

Fixed maturities

The Company uses the market approach valuation technique to estimate the fair value of its fixed maturity securities, when possible. The market approach includes obtaining prices from independent pricing services, such as index providers and pricing vendors, as well as to a lesser extent quotes from broker-dealers. The independent pricing sources obtain market quotations and actual transaction prices for securities that have quoted prices in active markets. Each source has its own proprietary method for determining the fair value of securities that are not actively traded. In general, these methods involve the use of “matrix pricing” in which the independent pricing source uses observable market inputs including, but not limited to, investment yields, credit risks and spreads, benchmarking of like securities, broker-dealer quotes, reported trades and sector groupings to determine a reasonable fair value.

The following describes the significant inputs generally used to determine the fair value of the Company’s fixed maturity securities by asset class:

U.S. government and government agencies – valuations provided by independent pricing services, with all prices provided through index providers and pricing vendors. The Company determined that all U.S. Treasuries would be classified as Level 1 securities due to observed levels of trading activity, the high number of strongly correlated pricing quotes received on U.S. Treasuries and other factors. The fair values of U.S. government agency securities are generally determined using the spread above the risk-free yield curve. As the yields for the risk-free yield curve and the spreads for these securities are observable market inputs, the

fair values of U.S. government agency securities are classified within Level 2.

Corporate bonds – valuations provided by independent pricing services, substantially all through index providers and pricing vendors with a small amount through broker-dealers. The fair values of these securities are generally determined using the spread above the risk-free yield curve. These spreads are generally obtained from the new issue market, secondary trading and from broker-dealers who trade in the relevant security market. As the significant inputs used in the pricing process for corporate bonds are observable market inputs, the fair value of these securities are classified within Level 2. A small number of securities are included in Level 3 due to a low level of transparency on the inputs used in the pricing process.

Municipal bonds – valuations provided by independent pricing services, with all prices provided through index providers and pricing vendors. The fair values of these securities are generally determined using spreads obtained from broker-dealers who trade in the relevant security market, trade prices and the new issue market. As the significant inputs used in the pricing process for municipal bonds are observable market inputs, the fair value of these securities are classified within Level 2.

Residential mortgage-backed securities – valuations provided by independent pricing services, substantially all through pricing vendors and index providers with a small amount through broker-dealers. The fair values of these securities are generally determined through the use of pricing models (including Option Adjusted Spread) which use spreads to determine the expected average life of the securities. These spreads are generally obtained from the new issue market, secondary trading and from broker-dealers who trade in the relevant security market. The pricing services also review prepayment speeds and other indicators, when applicable. As the significant inputs used in the pricing process for mortgage-backed securities are observable market inputs, the fair value of these securities are classified within Level 2. A small number of securities are included in Level 3 due to a low level of transparency on the inputs used in the pricing process.

Commercial mortgage-backed securities – valuations provided by independent pricing services, substantially all through index providers and pricing vendors with a small amount through broker-dealers. The fair values of these securities are generally determined through the use of pricing models which use spreads to determine the appropriate average life of the securities. These spreads are generally obtained from the new issue market, secondary trading and from broker-dealers who trade in the relevant security market. The pricing services also review prepayment speeds and other indicators, when applicable. As the significant inputs used in the pricing process for commercial mortgage-

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backed securities are observable market inputs, the fair value of these securities are classified within Level 2.

Non-U.S. government securities – valuations provided by independent pricing services, with all prices provided through index providers and pricing vendors. The fair values of these securities are generally based on international indices or valuation models which include daily observed yield curves, cross-currency basis index spreads and country credit spreads. As the significant inputs used in the pricing process for non-U.S. government securities are observable market inputs, the fair value of these securities are classified within Level 2.

Asset-backed securities – valuations provided by independent pricing services, substantially all through index providers and pricing vendors with a small amount through broker-dealers. The fair values of these securities are generally determined through the use of pricing models (including Option Adjusted Spread) which use spreads to determine the appropriate average life of the securities. These spreads are generally obtained from the new issue market, secondary trading and from broker-dealers who trade in the relevant security market. The pricing services also review prepayment speeds and other indicators, when applicable. As the significant inputs used in the pricing process for asset-backed securities are observable market inputs, the fair value of these securities are classified within Level 2. A small number of securities are included in Level 3 due to a low level of transparency on the inputs used in the pricing process.

Equity securities

The Company determined that exchange-traded equity securities would be included in Level 1 as their fair values are based on quoted market prices in active markets. Certain equity securities are included in Level 2 of the valuation hierarchy as the significant inputs used in the pricing process for such securities are observable market inputs. Other equity securities are included in Level 3 due to the lack of an available independent price source for such securities. As the significant inputs used to price these securities are unobservable, the fair value of such securities are classified as Level 3.

Other investments

The Company’s other investments include term loan investments for which fair values are estimated by using quoted prices of term loan investments with similar characteristics, pricing models or matrix pricing. Such investments are generally classified within Level 2. The fair values for certain of the Company’s other investments are determined using net asset values as advised by external fund managers. The net asset value is based on the fund manager’s valuation of the underlying holdings in accordance with the fund’s governing documents. In accordance with applicable accounting guidance, certain investments that are measured at

fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. A small number of securities are included in Level 3 due to the lack of an available independent price source for such securities.

Derivative instruments

The Company’s futures contracts, foreign currency forward contracts, interest rate swaps and other derivatives trade in the over-the-counter derivative market. The Company uses the market approach valuation technique to estimate the fair value for these derivatives based on significant observable market inputs from third party pricing vendors, non-binding broker-dealer quotes and/or recent trading activity. As the significant inputs used in the pricing process for these derivative instruments are observable market inputs, the fair value of these securities are classified within Level 2.

Short-term investments

The Company determined that certain of its short-term investments held in highly liquid money market-type funds, Treasury bills and commercial paper would be included in Level 1 as their fair values are based on quoted market prices in active markets. The fair values of other short-term investments are generally determined using the spread above the risk-free yield curve and are classified within Level 2.

Residential mortgage loans

The Company’s residential mortgage loans (included in ‘other assets’ in the consolidated balance sheets) include amounts related to the Company’s whole mortgage loan purchase and sell program. Fair values of residential mortgage loans are generally determined based on market prices. As significant inputs used in pricing process for these residential mortgage loans are observable market inputs, the fair value of these securities are classified within Level 2.

Other liabilities

The Company’s other liabilities include contingent and deferred consideration liabilities related to the Company’s acquisitions. Contingent consideration liabilities are remeasured at fair value at each balance sheet date with changes in fair value recognized in ‘net realized gains (losses).’ To determine the fair value of contingent consideration liabilities, the Company estimates the future payments using an income approach based on modeled inputs which include a weighted average cost of capital. Deferred consideration liabilities are measured at fair value on the transaction date. The Company determined that contingent and deferred consideration liabilities would be included within Level 3.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

The following table presents the Company’s financial assets and liabilities measured at fair value by level at September 30, 2022:

			Estimated Fair Value Measurements Using:
	Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets measured at fair value:
Available for sale securities:
Fixed maturities:
Corporate bonds	$	7,096,269	$	—	$	7,096,256	$	13
Residential mortgage backed securities	763,371		—		763,371		—
Municipal bonds	407,724		—		407,724		—
Commercial mortgage backed securities	1,064,238		—		1,064,238		—
U.S. government and government agencies	5,126,407		5,100,908		25,499		—
Non-U.S. government securities	2,073,170		—		2,073,170		—
Asset backed securities	1,589,548		—		1,589,548		—
Total	18,120,727		5,100,908		13,019,806		13
Short-term investments	1,940,857		1,873,480		67,377		—
Equity securities, at fair value	809,869		775,264		31,566		3,039
Derivative instruments (2)	176,160		—		176,160		—
Residential mortgage loans	2,255		—		2,255		—
Fair value option:
Corporate bonds	524,177		—		524,177		—
Non-U.S. government bonds	4,032		—		4,032		—
Asset backed securities	2,094		—		2,094		—
Short-term investments	28,614		405		28,209		—
Equity securities	13,905		9,312		1		4,592
Other investments	175,259		—		141,021		34,238
Other investments measured at net asset value (1)	830,670
Total	1,578,751		9,717		699,534		38,830
Total assets measured at fair value	$	22,628,619	$	7,759,369	$	13,996,698	$	41,882
Liabilities measured at fair value:
Other liabilities	$	(13,421)	$	—	$	—	$	(13,421)
Derivative instruments (2)	(112,577)		—		(112,577)		—
Total liabilities measured at fair value	$	(125,998)	$	—	$	(112,577)	$	(13,421)

(1)    In accordance with applicable accounting guidance, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.

(2)    See note 9.

ARCH CAPITAL  33 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

The following table presents the Company’s financial assets and liabilities measured at fair value by level at December 31, 2021:

			Estimated Fair Value Measurements Using:
	Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets measured at fair value:
Available for sale securities:
Fixed maturities:
Corporate bonds	$	6,553,333	$	—	$	6,553,320	$	13
Residential mortgage backed securities	408,477		—		408,477		—
Municipal bonds	404,666		—		404,666		—
Commercial mortgage backed securities	1,046,484		—		1,046,484		—
U.S. government and government agencies	4,772,764		4,744,517		28,247		—
Non-U.S. government securities	2,120,294		—		2,120,294		—
Asset backed securities	2,692,091		—		2,688,744		3,347
Total	17,998,109		4,744,517		13,250,232		3,360
Short-term investments	1,734,716		1,052,822		681,894		—
Equity securities, at fair value	1,804,170		1,762,864		38,388		2,918
Derivative instruments (2)	127,121		—		127,121		—
Residential mortgage loans	49,847		—		49,847		—
Fair value option:
Corporate bonds	388,546		—		388,546		—
Non-U.S. government bonds	23,785		—		23,785		—
Asset backed securities	4,367		—		4,367		—
Short-term investments	97,806		528		97,278		—
Equity securities	26,493		21,745		—		4,748
Other investments	310,798		20,352		262,465		27,981
Other investments measured at net asset value (1)	1,121,755
Total	1,973,550		42,625		776,441		32,729
Total assets measured at fair value	$	23,687,513	$	7,602,828	$	14,923,923	$	39,007
Liabilities measured at fair value:
Other liabilities	$	(16,960)	$	—	$	—	$	(16,960)
Derivative instruments (2)	(54,224)		—		(54,224)		—
Total liabilities measured at fair value	$	(71,184)	$	—	$	(54,224)	$	(16,960)

(1)    In accordance with applicable accounting guidance, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.

(2)    See note 9.

ARCH CAPITAL  34 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

The following table presents a reconciliation of the beginning and ending balances for all financial assets and liabilities measured at fair value on a recurring basis using Level 3 inputs:

	Assets												Liabilities
s	Available For Sale				Fair Value Option						Fair Value
	Structured Securities (1)		Corporate Bonds		Corporate Bonds		Other Investments		Equity Securities		Equity Securities		Other Liabilities
Three Months Ended September 30, 2022
Balance at beginning of period	$	2,867	$	3,570	$	—	$	33,331	$	4,392	$	2,906	$	(16,205)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)	(601)		52		—		116		200		133		(89)
Included in other comprehensive income	144		(59)		—		—		—		—		965
Purchases, issuances, sales and settlements
Purchases	—		—		—		1,458		—		—		—
Issuances	—		—		—		—		—		—		—
Sales	(2,051)		(3,550)		—		(667)		—		—		—
Settlements	(359)		—		—		—		—		—		1,908
Transfers in and/or out of Level 3	—		—		—		—		—		—		—
Balance at end of period	$	—	$	13	$	—	$	34,238	$	4,592	$	3,039	$	(13,421)
Three Months Ended September 30, 2021
Balance at beginning of period	$	3,424	$	13	$	998	$	73,900	$	73,678	$	49,136	$	(466)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)	10		—		—		—		38		11		—
Included in other comprehensive income	10		—		—		—		—		—		—
Purchases, issuances, sales and settlements
Purchases	—		—		—		—		—		208		(17,345)
Issuances	—		—		—		—		—		—		—
Sales (3)	—		—		(998)		(44,143)		(69,181)		(46,773)		—
Settlements	—		—		—		—		—		—		—
Transfers in and/or out of Level 3	—		—		—		—		—		—		—
Balance at end of period	$	3,444	$	13	$	—	$	29,757	$	4,535	$	2,582	$	(17,811)
Nine Months Ended September 30, 2022
Balance at beginning of year	$	3,347	$	13	$	—	$	27,981	$	4,748	$	2,918	$	(16,960)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)	(592)		52		—		150		(156)		(103)		(284)
Included in other comprehensive income	(1)		(59)		—		—		—		—		1,915
Purchases, issuances, sales and settlements
Purchases	—		—		—		12,228		—		227		—
Issuances	—		—		—		—		—		—		—
Sales	(2,051)		(3,550)		—		(3,138)		—		(3)		—
Settlements	(703)		—		—		(2,983)		—		—		1,908
Transfers in and/or out of Level 3	—		3,557		—		—		—		—		—
Balance at end of period	$	—	$	13	$	—	$	34,238	$	4,592	$	3,039	$	(13,421)
Nine Months Ended September 30, 2021
Balance at beginning of year	$	3,426	$	13	$	985	$	67,103	$	68,988	$	42,015	$	(461)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)	(46)		—		13		881		4,728		1,837		—
Included in other comprehensive income	67		—		—		—		—		—		—
Purchases, issuances, sales and settlements
Purchases	—		—		—		13,003		—		5,503		(17,345)
Issuances	—		—		—		—		—		—		—
Sales (3)	—		—		(998)		(51,230)		(69,181)		(46,773)		—
Settlements	(3)		—		—		—		—		—		(5)
Transfers in and/or out of Level 3	—		—		—		—		—		—		—
Balance at end of period	$	3,444	$	13	$	—	$	29,757	$	4,535	$	2,582	$	(17,811)

(1)    Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.

(2)    Gains or losses were included in net realized gains (losses).

(3)    Sales for the 2021 periods primarily related to the Company’s deconsolidation of Somers..

ARCH CAPITAL  35 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

Financial Instruments Disclosed, But Not Carried, At Fair Value

The Company uses various financial instruments in the normal course of its business. The carrying values of cash, accrued investment income, receivable for securities sold, certain other assets, payable for securities purchased and certain other liabilities approximated their fair values at September 30, 2022, due to their respective short maturities. As these financial instruments are not actively traded, their respective fair values are classified within Level 2.

At September 30, 2022, the Company’s senior notes were carried at their cost, net of debt issuance costs, of $2.7 billion and had a fair value of $2.3 billion. At December 31, 2021, the Company’s senior notes were carried at their cost, net of debt issuance costs, of $2.7 billion and had a fair value of $3.3 billion. The fair values of the senior notes were obtained from a third party pricing service and are based on observable market inputs. As such, the fair values of the senior notes are classified within Level 2.

9.    Derivative Instruments

The Company’s investment strategy allows for the use of derivative instruments. The Company’s derivative instruments are recorded on its consolidated balance sheets at fair value. The Company utilizes exchange traded U.S. Treasury note, Eurodollar and other futures contracts and commodity futures to manage portfolio duration or replicate investment positions in its portfolios and the Company routinely utilizes foreign currency forward contracts, currency options, index futures contracts and other derivatives as part of its total return objective. In addition, certain of the Company’s investments are managed in portfolios which incorporate the use of foreign currency forward contracts which are intended to provide an economic hedge against foreign currency movements. 

In addition, the Company purchases to-be-announced mortgage backed securities (“TBAs”) as part of its investment strategy. TBAs represent commitments to purchase a future issuance of agency mortgage backed securities. For the period between purchase of a TBA and issuance of the underlying security, the Company’s position is accounted for as a derivative. The Company purchases TBAs in both long and short positions to enhance investment performance and as part of its overall investment strategy.

The following table summarizes information on the fair values and notional values of the Company’s derivative instruments:

	Estimated Fair Value
	Asset Derivatives (1)		Liability Derivatives (1)		Notional Value (2)
September 30, 2022
Futures contracts	$	72,730	$	(60,684)	$	2,189,945
Foreign currency forward contracts	25,281		(26,995)		835,941
TBAs	—		—		—
Other	78,149		(24,898)		3,766,549
Total	$	176,160	$	(112,577)
December 31, 2021
Futures contracts	$	34,999	$	(9,808)	$	2,826,564
Foreign currency forward contracts	7,734		(11,390)		915,962
TBAs	11,227		—		11,227
Other	73,161		(33,026)		3,736,773
Total	$	127,121	$	(54,224)

(1)    The fair value of asset derivatives are included in ‘other assets’ and the fair value of liability derivatives are included in ‘other liabilities.’

(2)    Represents the absolute notional value of all outstanding contracts, consisting of long and short positions.

The Company did not hold any derivatives which were designated as hedging instruments at September 30, 2022 or December 31, 2021.

The Company’s derivative instruments can be traded under master netting agreements, which establish terms that apply to all derivative transactions with a counterparty. In the event of a bankruptcy or other stipulated event of default, such agreements provide that the non-defaulting party may elect to terminate all outstanding derivative transactions, in which case all individual derivative positions (loss or gain) with a counterparty are closed out and netted and replaced with a single amount, usually referred to as the termination amount, which is expressed in a single currency. The resulting single net amount, where positive, is payable to the party “in-the-money” regardless of whether or not it is the defaulting party, unless the parties have agreed that only the non-defaulting party is entitled to receive a termination payment where the net amount is positive and is in its favor. Contractual close-out netting reduces derivatives credit exposure from gross to net exposure.

At September 30, 2022, asset derivatives and liability derivatives of $164.9 million and $112.6 million, respectively, were subject to a master netting agreement, compared to $122.3 million and $53.9 million, respectively, at December 31, 2021. The remaining derivatives included in the preceding table were not subject to a master netting agreement.

ARCH CAPITAL  36 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

Realized and unrealized contract gains and losses on the Company’s derivative instruments are reflected in ‘net realized gains (losses)’ in the consolidated statements of income, as summarized in the following table:

Derivatives not designated as	September 30,
hedging instruments:	2022		2021
Three Months Ended
Net realized gains (losses):
Futures contracts	$	(26,347)	$	(10,073)
Foreign currency forward contracts	(18,340)		(16,146)
TBAs	—		(46)
Other (1)	(3,509)		4,830
Total	$	(48,196)	$	(21,435)
Nine Months Ended
Net realized gains (losses):
Futures contracts	$	(112,326)	$	(17,394)
Foreign currency forward contracts	(46,016)		(36,922)
TBAs	(51)		(46)
Other (1)	40,802		17,934
Total	$	(117,591)	$	(36,428)

(1)    Includes realized gains and losses on swaps, options and other derivatives contracts.

10.    Commitments and Contingencies

Letter of Credit and Revolving Credit Facilities

In the normal course of its operations, the Company enters into agreements with financial institutions to obtain secured and unsecured credit facilities. On April 7, 2022, Arch Capital and certain of its subsidiaries amended the existing five-year credit agreement into a $925.0 million facility (the “Credit Facility”) with a syndication of lenders. The Credit Facility, as amended, consists of a $425.0 million secured facility for letters of credit (the “Secured Facility”) and a $500.0 million unsecured facility for revolving loans and letters of credit (the “Unsecured Facility”). Obligations of each borrower under the Secured Facility for letters of credit are secured by cash and eligible securities of such borrower held in collateral accounts. Commitments under the Credit Facility may be increased up to, but not exceeding, an aggregate of $1.3 billion. Arch Capital has a one-time option to convert any or all outstanding revolving loans of Arch Capital and/or Arch-U.S. to term loans with the same terms as the revolving loans except that any prepayments may not be re-borrowed. Arch-U.S. guarantees the obligations of Arch Capital, and Arch Capital guarantees the obligations of Arch-U.S. Borrowings of revolving loans may be made at a variable rate based on SOFR. Secured letters of credit are available for issuance on behalf of certain Arch Capital subsidiaries. At September 30, 2022, the $425.0 million secured letter of credit facility, had $311.8 million of letters of credit outstanding and remaining capacity of

$113.2 million. In addition, certain of Arch Capital’s subsidiaries had outstanding secured and unsecured letters of credit through other facilities of $22.7 million and $290.0 million respectively, which were issued in the normal course of business.

Investment Commitments

The Company’s investment commitments, which are primarily related to agreements entered into by the Company to invest in funds and separately managed accounts when called upon, were approximately $3.1 billion at September 30, 2022, compared to $3.0 billion at December 31, 2021.

Interest Paid

Interest paid on the Company’s senior notes and other borrowings were $65.0 million for the nine months ended September 30, 2022, compared to $75.8 million for the 2021 period.

11.    Variable Interest Entities and Noncontrolling Interests

Somers

In March 2014, the Company invested $100.0 million and acquired approximately 11% of Somers’ outstanding common equity. Somers was considered a VIE and the Company concluded that it was the primary beneficiary of Somers, through June 30, 2021. As such, the results of Somers were included in the Company’s consolidated financial statements as of and for the periods ended June 30, 2021.

In the 2020 fourth quarter, Arch Capital, Somers and Greysbridge, a wholly-owned subsidiary of Arch Capital, entered into an Agreement and Plan of Merger (as amended, the “Merger Agreement”). The merger contemplated by the Merger Agreement and the related Greysbridge equity financing closed on July 1, 2021. In connection therewith and effective July 1, 2021, Somers became wholly owned by Greysbridge, and Greysbridge is now owned 40% by the Company, 30% by certain investment funds managed by Kelso and 30% by certain investment funds managed by Warburg. Based on the governing documents of Greysbridge, the Company concluded that, while it retains significant influence over Somers, Somers no longer constitutes a variable interest entity. Accordingly, effective July 1, 2021, the Company no longer consolidates the results of Somers in its consolidated financial statements and footnotes. Beginning in the 2021 third quarter, the Company classifies its investment as ‘investments in operating affiliates’ on the Company’s balance sheets and is accounted for under the equity method.

ARCH CAPITAL  37 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

Through June 30, 2021, Somers generated $47.0 million of cash provided by operating activities, $96.3 million of cash provided by investing activities and $2.0 million of cash used for financing activities.

Redeemable noncontrolling interests

The following table sets forth activity in the redeemable non-controlling interests:

	September 30,
	2022		2021
Three Months Ended
Balance, beginning of period	$	8,459	$	57,533
Impact of deconsolidation of Somers	—		(48,919)
Other	449		1,623
Balance, end of period	$	8,908	$	10,237
Nine Months Ended
Balance, beginning of year	$	9,233	$	58,548
Impact of deconsolidation of Somers	—		(48,919)
Other	(325)		608
Balance, end of period	$	8,908	$	10,237

The portion of income or loss attributable to third party investors, recorded in the Company’s consolidated statements of income in ‘net (income) loss attributable to noncontrolling interests,’ are summarized in the table below:

	September 30,
	2022		2021
Three Months Ended
Amounts attributable to non-redeemable noncontrolling interests	$	—	$	—
Amounts attributable to redeemable noncontrolling interests	(1,157)		(1,473)
Net (income) loss attributable to noncontrolling interests	$	(1,157)	$	(1,473)
Nine Months Ended
Amounts attributable to non-redeemable noncontrolling interests	$	—	$	(78,314)
Amounts attributable to redeemable noncontrolling interests	(2,390)		(3,889)
Net (income) loss attributable to noncontrolling interests	$	(2,390)	$	(82,203)

Bellemeade Re

The Company has entered into aggregate excess of loss mortgage reinsurance agreements with various special purpose reinsurance companies domiciled in Bermuda (the “Bellemeade Agreements”). At the time the Bellemeade Agreements were entered into, the applicability of the accounting guidance that addresses VIEs was evaluated. As a result of the evaluation of the Bellemeade Agreements, the Company concluded that these entities are VIEs. However, given that the ceding insurers do not have the unilateral power to direct those activities that are significant to their economic performance, the Company does not consolidate such entities in its consolidated financial statements. The following table presents the total assets of the Bellemeade entities, as well as the Company’s maximum exposure to loss associated with these VIEs, calculated as the maximum historical observable spread between the benchmark index for each respective transaction and short term invested trust asset yields. The benchmark index for agreements effective prior to 2021 is based on one-month LIBOR, while the 2021 and later agreements benchmark index is based on the Secured Overnight Financing Rate (“SOFR”). SOFR is a measure of the cost of borrowing cash overnight, collateralized by U.S. Treasury securities, and is based on directly observable U.S. Treasury-backed repurchase transactions.

			September 30, 2022										December 31, 2021
			Maximum Exposure to Loss										Maximum Exposure to Loss
Bellemeade Entities (Issue Date)	Total VIE Assets		On-Balance Sheet (Asset) Liability		Off-Balance Sheet		Total		Coverage Remaining from Reinsurers (1)		Total VIE Assets		On-Balance Sheet (Asset) Liability		Off-Balance Sheet		Total
2017-1 Ltd. (Oct-17)	$	46,772	$	(23)	$	88	$	65	$	—	$	108,368	$	(159)	$	424	$	265
2018-1 Ltd. (Apr-18)	103,131		(220)		644		424		—		181,136		(528)		1,268		740
2018-3 Ltd. (Oct-18)	217,701		(862)		2,107		1,245		—		302,563		(1,018)		2,496		1,478
2019-1 Ltd. (Mar-19)	119,193		(496)		2,704		2,208		—		181,324		(380)		5,807		5,427
2019-2 Ltd. (Apr-19)	347,050		(656)		4,308		3,652		—		398,316		(515)		3,998		3,483
2019-3 Ltd. (Jul-19)	257,663		(192)		1,492		1,300		—		409,859		(584)		3,190		2,606
2019-4 Ltd. (Oct-19)	283,684		(532)		3,663		3,131		—		411,954		(462)		4,759		4,297
2020-2 Ltd. (Sep-20)	122,897		(20)		595		575		153		217,766		(177)		1,984		1,807
2020-3 Ltd. (Nov-20)	268,385		(204)		2,845		2,641		8,569		348,818		(128)		5,793		5,665
2020-4 Ltd. (Dec-20)	107,396		10		707		717		4,795		176,826		(50)		1,630		1,580
2021-1 Ltd. (Mar-21)	497,069		(2,234)		936		(1,298)		43,198		568,986		(303)		3,283		2,980
2021-2 Ltd. (Jun-21)	471,039		(2,047)		984		(1,063)		80,268		522,807		281		4,124		4,405
2021-3 Ltd. (Sep-21)	498,309		(2,414)		991		(1,423)		129,127		507,873		(411)		3,446		3,035
2022-1 Ltd. (Jan-22)	283,500		(1,326)		627		(699)		33,260
2022-2 Ltd. (Sep-22)	201,005		—		744		744		126,160
Total	$	3,824,794	$	(11,216)	$	23,435	$	12,219	$	425,530	$	4,336,596	$	(4,434)	$	42,202	$	37,768

(1) Coverage from a separate panel of reinsurers remaining at September 30, 2022.

ARCH CAPITAL  38 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

12.    Other Comprehensive Income (Loss)

The following tables present details about amounts reclassified from accumulated other comprehensive income and the tax effects allocated to each component of other comprehensive income (loss):

		Amounts Reclassified from AOCI
	Consolidated Statement of Income	Three Months Ended				Nine Months Ended
Details About	Line Item That Includes	September 30,				September 30,
AOCI Components	Reclassification	2022		2021		2022		2021
Unrealized appreciation (decline) on available-for-sale investments
	Net realized gains (losses)	$	(55,940)	$	68,373	$	(186,570)	$	135,291
	Provision for credit losses	8,652		(457)		(48,096)		(1,208)
	Total before tax	(47,288)		67,916		(234,666)		134,083
	Income tax (expense) benefit	703		(5,262)		28,093		(13,579)
	Net of tax	$	(46,585)	$	62,654	$	(206,573)	$	120,504

	Before Tax Amount		Tax Expense (Benefit)		Net of Tax Amount
Three Months Ended September 30, 2022
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains (losses) arising during period	$	(671,907)	$	(62,148)	$	(609,759)
Less reclassification of net realized gains (losses) included in net income	(47,288)		(703)		(46,585)
Foreign currency translation adjustments	(70,388)		—		(70,388)
Other comprehensive income (loss)	$	(695,007)	$	(61,445)	$	(633,562)
Three Months Ended September 30, 2021
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains (losses) arising during period	$	(104,607)	$	(8,684)	$	(95,923)
Less reclassification of net realized gains (losses) included in net income	67,916		5,262		62,654
Foreign currency translation adjustments	(32,060)		(350)		(31,710)
Other comprehensive income (loss)	$	(204,583)	$	(14,296)	$	(190,287)
Nine Months Ended September 30, 2022
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains (losses) arising during period	$	(2,132,845)	$	(240,726)	$	(1,892,119)
Less reclassification of net realized gains (losses) included in net income	(234,666)		(28,093)		(206,573)
Foreign currency translation adjustments	(141,515)		166		(141,681)
Other comprehensive income (loss)	$	(2,039,694)	$	(212,467)	$	(1,827,227)
Nine Months Ended September 30, 2021
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains (losses) arising during period	$	(307,910)	$	(28,808)	$	(279,102)
Less reclassification of net realized gains (losses) included in net income	134,083		13,579		120,504
Foreign currency translation adjustments	(54,083)		6		(54,089)
Other comprehensive income (loss)	$	(496,076)	$	(42,381)	$	(453,695)

ARCH CAPITAL  39 2022 THIRD QUARTER FORM 10-Q

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

13.    Income Taxes

The Company’s income tax provision on income before income taxes, including income (loss) from operating affiliates, resulted in an effective tax rate of 3.0% for the nine months ended September 30, 2022, compared to 5.5% for the nine months ended September 30, 2021. The effective tax rate for the nine months ended September 30, 2022 and 2021 periods included discrete income tax benefits of $36.5 million and $28.7 million, respectively. The discrete income tax benefits had the effect of decreasing the effective tax rate on net income available to Arch common shareholders by 5.7% and 1.7%, respectively. The discrete tax items in both periods were primarily related to the release of a valuation allowance on certain U.K. deferred tax assets.

The Company’s effective tax rate, which is based upon the expected annual effective tax rate, may fluctuate from period to period based on the relative mix of income or loss reported by jurisdiction and the varying tax rates in each jurisdiction.

The Company had a net deferred tax asset of $572.1 million at September 30, 2022, compared to a net deferred tax asset of $194.0 million at December 31, 2021. The change is primarily a result of market value fluctuations in the investment portfolio. In addition, the Company paid $201.6 million and $202.4 million of income taxes for the nine months ended September 30, 2022 and 2021, respectively.

14.    Legal Proceedings

The Company, in common with the insurance industry in general, is subject to litigation and arbitration in the normal course of its business. As of September 30, 2022, the Company was not a party to any litigation or arbitration which is expected by management to have a material adverse effect on the Company’s results of operations and financial condition and liquidity.

15.    Transactions with Related Parties

In the 2021 first quarter, as part of the Company’s acquisition of Barbican, the Company entered into an agreement with Premia Managing Agency Limited for the reinsurance to close of Syndicate 1955’s 2018 underwriting year of account into Premia Syndicate 1884’s 2021 underwriting year of account. The reinsurance to close covers legacy business underwritten by Syndicate 1955 on the underwriting 2018 and prior years of account and under the agreement, approximately $380 million of net liabilities was transferred to Syndicate 1884, with an effective date of January 1, 2021. The Company had no reinsurance recoverable on unpaid and paid losses or funds held liability at September 30, 2022 and December 31, 2021.

In July 2021, following consummation of the Merger Agreement and the related Greysbridge equity financing, pursuant to which Somers became wholly owned by Greysbridge, and Greysbridge became owned 40% by the Company, 30% by certain funds managed by Kelso and 30% by certain funds managed by Warburg, the Company entered into certain reinsurance transactions with Somers. For the three and nine months ended September 30, 2022, the Company ceded premiums written related to such transactions of $236.5 million and $661.1 million, respectively (which includes reinsurance transactions in force as well as those entered into in conjunction with the Merger Agreement). For the three and nine months ended September 30, 2021, the Company ceded premiums written related to such transactions of $316.2 million. In addition, Somers paid certain acquisition costs and administrative fees to the Company. At September 30, 2022, reinsurance recoverable on unpaid and paid losses from Somers was $1.1 billion, with a reinsurance balance payable to Somers of $408.0 million. At December 31, 2021, reinsurance recoverable on unpaid and paid losses from Somers was $902.8 million, with a reinsurance balance payable to Somers of $258.4 million. See note 11 for information about Somers.

The Company has a put/call option that was entered into in connection with the Greysbridge equity financing, whereby beginning January 1, 2024 the Company will have a call right (but not the obligation) and Warburg and Kelso will each have a put right (but not the obligation) to buy/sell one third of their initial shares annually at the tangible book value per share of Greysbridge for the most recently ended fiscal quarter.

As of September 30, 2022, the Company owns $35.0 million in aggregate principal amount of Somers Group Holdings Ltd’s 6.5% senior notes, due July 2, 2029.

ARCH CAPITAL  40 2022 THIRD QUARTER FORM 10-Q

ITEM 2.     MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following is a discussion and analysis of our financial condition and results of operations. This should be read in conjunction with our consolidated financial statements included in Item 1 of this report and also our Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in our Annual Report on Form 10-K for the year ended December 31, 2021 (“2021 Form 10-K”). In addition, readers should review “Risk Factors” set forth in Item 1A of Part I of our 2021 Form 10-K and “ITEM 1A—Risk Factors” of this Form 10-Q. Tabular amounts are in U.S. Dollars in thousands, except share amounts, unless otherwise noted.

Arch Capital Group Ltd. (“Arch Capital” and, together with its subsidiaries, “Arch”, “we”, “our” or “us”) is a publicly listed Bermuda exempted company with approximately $14.5 billion in capital at September 30, 2022 and, through operations in Bermuda, the United States, Europe, Canada, Australia and Hong Kong, writes insurance, reinsurance and mortgage insurance on a worldwide basis.

		Page No.
Current Outlook		42
Financial Measures		42
Comments on Non-GAAP Measures		44
Results of Operations		46
	Insurance Segment	46
	Reinsurance Segment	49
	Mortgage Segment	51
	Corporate Segment	54
Critical Accounting Policies, Estimates and Recent Accounting Pronouncements		55
Financial Condition		55
Liquidity		61
Capital Resources and Other		61

ARCH CAPITAL  41 2022 THIRD QUARTER FORM 10-Q

CURRENT OUTLOOK

As we approach the end of 2022, we are cautiously optimistic regarding the opportunities ahead of us in the fourth quarter and into 2023. Our objective remains the same, to deliver long term value for our shareholders. We are committed to agile cycle management predicated by a focus on risk-adjusted returns, and this commitment has enabled us to accelerate our growth through the deployment of meaningful capacity to our clients. We continue to execute our cycle management strategy by actively allocating capital to the sectors where rates allow for returns that are higher than our cost of capital.

Inflation continues to be a focus for our industry. We proactively analyze available data and we incorporate emerging trends into our pricing and reserving. We believe that this discipline, coupled with increases in future investment returns and prudent reserving, helps us somewhat mitigate inflation’s impact.

Hurricane Ian, alongside a fair amount of other catastrophic activity in the third quarter, served as a stark reminder of the importance of insurance capacity. The catastrophic activity in the third quarter has significantly increased pressure on property catastrophe markets, which could have a ripple effect across all property and casualty lines. As a result, we continue to show improved underwriting margins, partially due to the compounding of rate-on-rate increases and the rebalancing of our mix of business. We believe that this time-tested strategy of protecting capital through soft markets and increasing our writings in hard markets gives us the best chance to generate superior risk adjusted returns over time. As long as rate increases support returns above our required thresholds, we expect to continue to grow our writings.

Rate improvements have enabled us to continue to expand writings in our property casualty segments. Rate increases remain above the long-term loss cost trends and have spread to more lines than last year. In insurance, underwriting conditions remain opportunistic as pricing discipline, terms and conditions, and limits management are stable across most lines. This stability, combined with the uncertainties in the insurance market, should keep the market disciplined and sustain rate increases. Our U.S. operations benefited from growth in professional liability, including cyber, as well as travel where we believe relative returns are attractive. Cyber insurance has become increasingly important to our insureds globally, and we have substantially increased our focus because we believe that today’s cyber market has changed for the better. Additionally, insurance terms and conditions have sufficiently tightened, retentions have increased and rates have reached a level where we have an opportunity to earn an appropriate return for the assumption of risk.

In reinsurance, the emphasis remains on quota share treaties over excess of loss reinsurance. This strategy allows us to participate in the rate increases on primary insurance while improving the balance between risk and return. We remained disciplined in property catastrophe exposure and we will deploy more capital to the line if expected returns improve meaningfully. Excellent market conditions and the likelihood of capacity constraints will likely create an eventful January 1 renewal period, and our teams are actively planning to meet the demands of our clients.

In mortgage, we continue to be thoughtful in how we manage our portfolio and, because of our diversified model, we have the ability to take a measured view of the business as just one component of our diversified enterprise. Our mortgage business continues to deliver consistent underwriting results, once again demonstrating its sustainable earnings model. Although higher interest rates affected new loan origination volume, the persistency rate of our portfolio improved and U.S. primary mortgage insurance in force grew to nearly $295 billion. The credit quality of homebuyers remains excellent and we believe our portfolio is well positioned for a variety of economic scenarios.

We remain committed to providing solutions across many offerings as the marketplace evolves, including the mortgage credit risk transfer programs initiated by government sponsored enterprises, or (“GSEs”). In addition, we have entered into aggregate excess of loss mortgage reinsurance agreements with various special purpose reinsurance companies domiciled in Bermuda and have issued mortgage insurance linked notes, increasing our protection for mortgage tail risk. The Bellemeade structures provided approximately $4.3 billion of aggregate reinsurance coverage at September 30, 2022.

FINANCIAL MEASURES

Management uses the following three key financial indicators in evaluating our performance and measuring the overall growth in value generated for Arch Capital’s common shareholders:

Book Value per Share

Book value per share represents total common shareholders’ equity available to Arch divided by the number of common shares outstanding. Management uses growth in book value per share as a key measure of the value generated for our common shareholders each period and believes that book value per share is the key driver of Arch Capital’s share price over time. Book value per share is impacted by, among other factors, our underwriting results, investment returns and share repurchase activity, which has an accretive or dilutive impact on book value per share depending on the purchase price. Book value per share was $29.69 at September 30, 2022, compared to $31.37 at June 30, 2022 and $32.43 at

ARCH CAPITAL  42 2022 THIRD QUARTER FORM 10-Q

September 30, 2021. The 5.4% decrease in book value per share for the 2022 third quarter reflected negative total return on investments driven by rising interest rates on fixed maturities, along with higher level of catastrophic loss activity, primarily related to Hurricane Ian.

Operating Return on Average Common Equity

Operating return on average common equity (“Operating ROAE”) represents annualized after-tax operating income available to Arch common shareholders divided by the average of beginning and ending common shareholders’ equity available to Arch during the period. After-tax operating income available to Arch common shareholders, a non-GAAP financial measure as defined in Regulation G, represents net income available to Arch common shareholders, excluding net realized gains or losses (which includes changes in the allowance for credit losses on financial assets and net impairment losses recognized in earnings) equity in net income or loss of investment funds accounted for using the equity method, net foreign exchange gains or losses, transaction costs and other, loss on redemption of preferred shares and income taxes. Management uses Operating ROAE as a key measure of the return generated to common shareholders. See “Comment on Non-GAAP Financial Measures.”

Our annualized net income return on average common equity was 0.2% for the 2022 third quarter, compared to 12.3% for the 2021 third quarter, and 6.6% for the nine months ended September 30, 2022, compared to 15.9% for the 2021 period. Our Operating ROAE was 3.8% for the 2022 third quarter, compared to 9.3% for the 2021 third quarter, and 11.6% for the nine months ended September 30, 2022, compared to 10.1% for the 2021 period. The 2022 periods reflected increased levels of catastrophic activity, while the 2021 periods reflected higher income from operating affiliates.

Total Return on Investments

Total return on investments includes investment income, equity in net income or loss of investment funds accounted for using the equity method, net realized gains and losses (excluding changes in the allowance for credit losses on non-investment related financial assets) and the change in unrealized gains and losses generated by Arch’s investment portfolio. Total return is calculated on a pre-tax basis and before investment expenses and reflects the effect of financial market conditions along with foreign currency fluctuations. In addition, total return incorporates the timing of investment returns during the periods. The following table summarizes our total return compared to the benchmark return against which we measured our portfolio during the periods. See “Comment on Non-GAAP Financial Measures.”

	Arch Portfolio		Benchmark Return
Pre-tax total return (before investment expenses):
2022 Third Quarter	(3.01)	%	(4.01)	%
2021 Third Quarter	0.01	%	(0.40)	%
Nine Months Ended September 30, 2022	(8.83)	%	(12.78)	%
Nine Months Ended September 30, 2021	1.50	%	0.87	%

Total return for the 2022 periods reflected rising interest rates on fixed maturities and weak equity markets. We continue to maintain a relative short duration on our portfolio of 2.84 years at September 30, 2022.

The benchmark return index is a customized combination of indices intended to approximate a target portfolio by asset mix and average credit quality while also matching the approximate estimated duration and currency mix of our insurance and reinsurance liabilities. Although the estimated duration and average credit quality of this index will move as the duration and rating of its constituent securities change, generally we do not adjust the composition of the benchmark return index except to incorporate changes to the mix of liability currencies and durations noted above. The benchmark return index should not be interpreted as expressing a preference for or aversion to any particular sector or sector weight. The index is intended solely to provide, unlike many master indices that change based on the size of their constituent indices, a relatively stable basket of investable indices. At September 30, 2022, the benchmark return index had an average credit quality of “Aa3” by Moody’s Investors Service (“Moody’s”), and an estimated duration of 3.15 years.

ARCH CAPITAL  43 2022 THIRD QUARTER FORM 10-Q

The benchmark return index included weightings to the following indices:

	%
ICE BoAML 1-5 Year A - AAA U.S. Corporate Index	13.00	%
ICE BoAML 5-10 Year A - AAA U.S. Corporate Index	11.00
ICE BoAML 1-5 Year U.S. Treasury Index	11.00
MSCI ACWI Net Total Return USD Index	9.30
ICE BoAML 1-10 Year BBB U.S. Corporate Index	5.00
JPM CLOIE Investment Grade	5.00
S&P/LSTA Leveraged Loan Total Return Index	4.965
ICE BoAML U.S. Mortgage Backed Securities Index	4.00
ICE BoAML AAA US Fixed Rate CMBS	4.00
ICE BoAML 1-5 Year U.K. Gilt Index	4.00
ICE BoAML German Government 1-10 Year Index	3.50
ICE BoAML 0-3 Year U.S. Treasury Index	3.25
ICE BoAML 5-10 Year U.S. Treasury Index	3.00
ICE BoAML 1-10 Year U.S. Municipal Securities Index	3.00
Bloomberg Barclays ABS Aaa Index	3.00
ICE BoAML 1-5 Year Australia Government Index	2.75
ICE BoAML U.S. High Yield Constrained Index	2.50
ICE BoAML 1-5 Year Canada Government Index	2.00
ICE BofA CCC and Lower US High Yield Constrained Index	1.38
Bloomberg Barclays Global High Yield Index	1.38
S&P DJ Global ex-US Select Real Estate Securities Net Index	0.825
FTSE Nareit All Mortgage Capped Index Total Return USD	0.825
Bloomberg Barclays CMBS: Erisa Eligible Unhedged USD	0.825
ICE BoAML 15+ Year Canada Government Index	0.50
Total	100.00	%

COMMENT ON NON-GAAP FINANCIAL MEASURES

Throughout this filing, we present our operations in the way we believe will be the most meaningful and useful to investors, analysts, rating agencies and others who use our financial information in evaluating the performance of our company. This presentation includes the use of after-tax operating income available to Arch common shareholders, which is defined as net income available to Arch common shareholders, excluding net realized gains or losses (which includes changes in the allowance for credit losses on financial assets and net impairment losses recognized in earnings), equity in net income or loss of investment funds accounted for using the equity method, net foreign exchange gains or losses, transaction costs and other, loss on redemption of preferred shares and income taxes, and the use of annualized operating return on average common equity. The presentation of after-tax operating income available to Arch common shareholders and annualized operating return on average common equity are non-GAAP financial measures as defined in Regulation G. The reconciliation of such measures to net income available to Arch common shareholders and annualized net income return on average

common equity (the most directly comparable GAAP financial measures) in accordance with Regulation G is included under “Results of Operations” below.

We believe that net realized gains or losses, equity in net income or loss of investment funds accounted for using the equity method, net foreign exchange gains or losses, transaction costs and other and loss on redemption of preferred shares in any particular period are not indicative of the performance, of or trends, in our business. Although net realized gains or losses, equity in net income or loss of investment funds accounted for using the equity method and net foreign exchange gains or losses are an integral part of our operations, the decision to realize investment gains or losses, the recognition of the change in the carrying value of investments accounted for using the fair value option in net realized gains or losses, the recognition of net impairment losses, the recognition of equity in net income or loss of investment funds accounted for using the equity method and the recognition of foreign exchange gains or losses are independent of the insurance underwriting process and result, in large part, from general economic and financial market conditions. Furthermore, certain users of our financial information believe that, for many companies, the timing of the realization of investment gains or losses is largely opportunistic. In addition, changes in the allowance for credit losses and net impairment losses recognized in earnings on our investments represent other-than-temporary declines in expected recovery values on securities without actual realization. The use of the equity method on certain of our investments is driven by the ownership structure of such funds (either limited partnerships or limited liability companies). In applying the equity method, these investments are initially recorded at cost and are subsequently adjusted based on our proportionate share of the net income or loss of the funds (which include changes in the market value of the underlying securities in the funds). This method of accounting is different from the way we account for our other investments and the timing of the recognition of equity in net income or loss of investment funds accounted for using the equity method may differ from gains or losses in the future upon sale or maturity of such investments. Transaction costs and other include advisory, financing, legal, severance, incentive compensation and other transaction costs related to acquisitions. We believe that transaction costs and other, due to their non-recurring nature, are not indicative of the performance of, or trends in, our business performance. The loss on redemption of preferred shares related to the redemption of some of Arch’s preferred shares had no impact on shareholders' equity or cash flows. Due to these reasons, we exclude net realized gains or losses, equity in net income or loss of investment funds accounted for using the equity method, net foreign exchange gains or losses, transaction costs and other and loss on redemption of preferred shares from the calculation of after-tax operating income available to Arch common shareholders.

ARCH CAPITAL  44 2022 THIRD QUARTER FORM 10-Q

We believe that showing net income available to Arch common shareholders exclusive of the items referred to above reflects the underlying fundamentals of our business since we evaluate the performance of and manage our business to produce an underwriting profit. In addition to presenting net income available to Arch common shareholders, we believe that this presentation enables investors and other users of our financial information to analyze our performance in a manner similar to how management analyzes performance. We also believe that this measure follows industry practice and, therefore, allows the users of financial information to compare our performance with our industry peer group. We believe that the equity analysts and certain rating agencies which follow us and the insurance industry as a whole generally exclude these items from their analyses for the same reasons.

Our segment information includes the presentation of consolidated underwriting income or loss and a subtotal of underwriting income or loss before the contribution from the ‘other’ segment. The ‘other’ segment includes the results of Somers through June 30, 2021. Such measures represent the pre-tax profitability of our underwriting operations and include net premiums earned plus other underwriting income, less losses and loss adjustment expenses, acquisition expenses and other operating expenses. Other operating expenses include those operating expenses that are incremental and/or directly attributable to our individual underwriting operations. Underwriting income or loss does not incorporate items included in our corporate segment. While these measures are presented in note 4, “Segment Information,” of the notes accompanying our consolidated financial statements, they are considered non-GAAP financial measures when presented elsewhere on a consolidated basis. The reconciliations of underwriting income or loss to income before income taxes (the most directly comparable GAAP financial measure) on a consolidated basis and a subtotal before the contribution from the ‘other’ segment through June 30, 2021, in accordance with Regulation G, is shown in note 4, “Segment Information” to our consolidated financial statements.

We measure segment performance for our three underwriting segments based on underwriting income or loss. We do not manage our assets by underwriting segment, with the exception of goodwill and intangibles and, accordingly, investment income and other non-underwriting related items are not allocated to each underwriting segment. The ‘other’ segment includes the results of Somers through June 30, 2021.

Along with consolidated underwriting income, we provide a subtotal of underwriting income or loss before the contribution from the ‘other’ segment. Through June 30, 2021, the ‘other’ segment included the results of Somers Group Holdings Ltd. Somers Group Holdings Ltd. is the parent of Somers Re Ltd., a multi-line Bermuda reinsurance

company (together with Somers Group Holdings Ltd., “Somers”). Pursuant to GAAP, Somers was considered a variable interest entity and we concluded that we were the primary beneficiary of Somers. As such, we consolidated the results of Somers in our consolidated financial statements through June 30, 2021. In the 2020 fourth quarter, Arch Capital, Somers, and Greysbridge Ltd., a wholly-owned subsidiary of Arch Capital, entered into an Agreement and Plan of Merger (as amended, the “Merger Agreement”). Arch Capital assigned its rights under the Merger Agreement to Greysbridge Holdings Ltd. (“Greysbridge”). The merger contemplated by the Merger Agreement and the related Greysbridge equity financing closed on July 1, 2021. In connection therewith and effective July 1, 2021, Somers became wholly owned by Greysbridge, and Greysbridge became owned 40% by Arch and 30% by certain funds managed by Kelso and 30% by certain funds managed by Warburg. Based on the governing documents of Greysbridge, we concluded that, while we retain significant influence over Greysbridge, Greysbridge does not constitute a variable interest entity. Accordingly, effective July 1, 2021, we no longer consolidate the results of Somers in our consolidated financial statements and footnotes. See note 11, “Variable Interest Entities and Noncontrolling Interests” and note 4, “Segment Information,” to our consolidated financial statements for additional information on Somers.

Our presentation of segment information includes the use of a current year loss ratio which excludes favorable or adverse development in prior year loss reserves. This ratio is a non-GAAP financial measure as defined in Regulation G. The reconciliation of such measure to the loss ratio (the most directly comparable GAAP financial measure) in accordance with Regulation G is shown on the individual segment pages. Management utilizes the current year loss ratio in its analysis of the underwriting performance of each of our underwriting segments.

Total return on investments includes investment income, equity in net income or loss of investment funds accounted for using the equity method, net realized gains and losses (excluding changes in the allowance for credit losses on non-investment related financial assets) and the change in unrealized gains and losses generated by Arch’s investment portfolio. Total return is calculated on a pre-tax basis and before investment expenses, excludes amounts reflected in the ‘other’ segment, and reflects the effect of financial market conditions along with foreign currency fluctuations. In addition, total return incorporates the timing of investment returns during the periods. There is no directly comparable GAAP financial measure for total return. Management uses total return on investments as a key measure of the return generated to Arch common shareholders, and compares the return generated by our investment portfolio against benchmark returns during the periods.

ARCH CAPITAL  45 2022 THIRD QUARTER FORM 10-Q

RESULTS OF OPERATIONS

The following table summarizes our consolidated financial data, including a reconciliation of net income or loss available to Arch common shareholders to after-tax operating income or loss available to Arch common shareholders.

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Net income available to Arch common shareholders	$	6,917	$	388,751	$	586,693	$	1,480,324
Net realized (gains) losses	183,674		25,040		742,667		(247,949)
Equity in net (income) loss of investment funds accounted for using the equity method	18,861		(105,398)		(75,505)		(299,270)
Net foreign exchange (gains) losses	(90,537)		(36,078)		(182,189)		(39,522)
Transaction costs and other	76		1,036		734		889
Loss on redemption of preferred shares	—		15,101		—		15,101
Income tax expense (benefit) (1)	(13,019)		6,236		(37,933)		32,100
After-tax operating income available to Arch common shareholders	$	105,972	$	294,688	$	1,034,467	$	941,673
Beginning common shareholders’ equity	$	11,587,566	$	12,706,072	$	12,715,896	$	12,325,886
Ending common shareholders’ equity	$	10,965,110	$	12,557,526	$	10,965,110	$	12,557,526
Average common shareholders’ equity	$	11,276,338	$	12,631,799	$	11,840,503	$	12,441,706
Annualized net income return on average common equity %	0.2		12.3		6.6		15.9
Annualized operating return on average common equity %	3.8		9.3		11.6		10.1

(1)    Income tax expense on net realized gains or losses, equity in net income or loss of investment funds accounted for using the equity method, net foreign exchange gains or losses and transaction costs and other reflects the relative mix reported by jurisdiction and the varying tax rates in each jurisdiction.

Segment Information

We classify our businesses into three underwriting segments — insurance, reinsurance and mortgage — and two other operating segments — corporate and ‘other.’ Our insurance, reinsurance and mortgage segments each have managers who are responsible for the overall profitability of their respective segments and who are directly accountable to our chief operating decision makers, the Chief Executive Officer of Arch Capital, the Chief Financial Officer and Treasurer of Arch Capital and the President and Chief Underwriting Officer of Arch Capital. The chief operating decision makers do not assess performance, measure return on equity or make resource allocation decisions on a line of business basis. Management measures segment performance for our three underwriting segments based on underwriting income or loss. We do not manage our assets by underwriting segment, with the exception of goodwill and intangible assets, and, accordingly, investment income is not allocated to each underwriting segment.

We determined our reportable segments using the management approach described in accounting guidance regarding disclosures about segments of an enterprise and related information. The accounting policies of the segments are the same as those used for the preparation of our consolidated financial statements. Intersegment business is allocated to the segment accountable for the underwriting results.

Insurance Segment

The following tables set forth our insurance segment’s underwriting results:

	Three Months Ended September 30,
	2022			2021			%  Change
Gross premiums written	$	1,862,026		$	1,596,619		16.6
Premiums ceded	(493,267)			(442,806)
Net premiums written	1,368,759			1,153,813			18.6
Change in unearned premiums	(181,851)			(215,143)
Net premiums earned	1,186,908			938,670			26.4
Losses and loss adjustment expenses	(822,663)			(668,630)
Acquisition expenses	(232,469)			(152,467)
Other operating expenses	(165,499)			(138,931)
Underwriting income (loss)	$	(33,723)		$	(21,358)		(57.9)
Underwriting Ratios							% Point Change
Loss ratio	69.3		%	71.2		%	(1.9)
Acquisition expense ratio	19.6		%	16.2		%	3.4
Other operating expense ratio	13.9		%	14.8		%	(0.9)
Combined ratio	102.8		%	102.2		%	0.6

ARCH CAPITAL  46 2022 THIRD QUARTER FORM 10-Q

	Nine Months Ended September 30,
	2022			2021			% Change
Gross premiums written	$	5,286,798		$	4,381,372		20.7
Premiums ceded	(1,482,886)			(1,269,165)
Net premiums written	3,803,912			3,112,207			22.2
Change in unearned premiums	(488,164)			(488,636)
Net premiums earned	3,315,748			2,623,571			26.4
Losses and loss adjustment expenses	(2,053,161)			(1,750,257)
Acquisition expenses	(641,807)			(417,541)
Other operating expenses	(493,412)			(409,386)
Underwriting income (loss)	$	127,368		$	46,387		174.6
Underwriting Ratios							% Point Change
Loss ratio	61.9		%	66.7		%	(4.8)
Acquisition expense ratio	19.4		%	15.9		%	3.5
Other operating expense ratio	14.9		%	15.6		%	(0.7)
Combined ratio	96.2		%	98.2		%	(2.0)

The insurance segment consists of our insurance underwriting units which offer specialty product lines on a worldwide basis. Product lines include:

Construction and national accounts: primary and excess casualty coverages to middle and large accounts in the construction industry and a wide range of products for middle and large national accounts, specializing in loss sensitive primary casualty insurance programs (including large deductible, self-insured retention and retrospectively rated programs).

Excess and surplus casualty: primary and excess casualty insurance coverages, including middle market energy business, and contract binding, which primarily provides casualty coverage through a network of appointed agents to small and medium risks.

Lenders products: collateral protection, debt cancellation and service contract reimbursement products to banks, credit unions, automotive dealerships and original equipment manufacturers and other specialty programs that pertain to automotive lending and leasing.

Professional lines: directors’ and officers’ liability, errors and omissions liability, employment practices liability, fiduciary liability, crime, professional indemnity and other financial related coverages for corporate, private equity, venture capital, real estate investment trust, limited partnership, financial institution and not-for-profit clients of all sizes, cyber insurance, and medical professional and general liability insurance coverages for the healthcare industry. The business is predominately written on a claims-made basis.

Programs: primarily package policies, underwriting workers’ compensation and umbrella liability business in support of desirable package programs, targeting program managers with unique expertise and niche products offering general

liability, commercial automobile, inland marine and property business with minimal catastrophe exposure.

Property, energy, marine and aviation: primary and excess general property insurance coverages, including catastrophe-exposed property coverage, for commercial clients. Coverages for marine include hull, war, specie and liability. Aviation and standalone terrorism are also offered.

Travel, accident and health: specialty travel and accident and related insurance products for individual, group travelers, travel agents and suppliers, as well as accident and health, which provides accident, disability and medical plan insurance coverages for employer groups, medical plan members, students and other participant groups.

Other: includes alternative market risks (including captive insurance programs), excess workers’ compensation and employer’s liability insurance coverages for qualified self-insured groups, associations and trusts, and contract and commercial surety coverages, including contract bonds (payment and performance bonds) primarily for medium and large contractors and commercial surety bonds for Fortune 1,000 companies and smaller transaction business programs.

Premiums Written.

The following tables set forth our insurance segment’s net premiums written by major line of business:

	Three Months Ended September 30,
	2022			2021
	Amount		%	Amount		%
Professional lines	$	412,173	30.1	$	310,185	26.9
Property, energy, marine and aviation	241,357		17.6	205,021		17.8
Programs	189,263		13.8	196,048		17.0
Excess and surplus casualty	110,917		8.1	98,320		8.5
Travel, accident and health	107,434		7.8	62,837		5.4
Construction and national accounts	98,381		7.2	102,294		8.9
Lenders products	41,889		3.1	38,905		3.4
Other	167,345		12.2	140,203		12.2
Total	$	1,368,759	100.0	$	1,153,813	100.0

2022 Third Quarter versus 2021 Period. Gross premiums written by the insurance segment in the 2022 third quarter were 16.6% higher than in the 2021 third quarter, while net premiums written were 18.6% higher. The higher level of net premiums written reflected increases in most lines of business, due in part to rate increases, new business opportunities and growth in existing accounts.

ARCH CAPITAL  47 2022 THIRD QUARTER FORM 10-Q

	Nine Months Ended September 30,
	2022			2021
	Amount		%	Amount		%
Professional lines	$	1,109,416	29.2	$	803,392	25.8
Property, energy, marine and aviation	687,742		18.1	564,462		18.1
Programs	482,003		12.7	503,822		16.2
Excess and surplus casualty	331,715		8.7	258,259		8.3
Travel, accident and health	378,736		10.0	226,214		7.3
Construction and national accounts	334,720		8.8	333,484		10.7
Lenders products	103,163		2.7	114,151		3.7
Other	376,417		9.9	308,423		9.9
Total	$	3,803,912	100.0	$	3,112,207	100.0

Nine Months Ended September 30, 2022 versus 2021 period. Gross premiums written by the insurance segment for the nine months ended September 30, 2022 were 20.7% higher than in the 2021 period, while net premiums written were 22.2% higher than in the 2021 period. The increase in net premiums written reflected growth in professional lines and in property, primarily due to rate increases, new business opportunities and growth in existing accounts, and in travel, primarily due to new business and growth in existing accounts.

Net Premiums Earned.

The following tables set forth our insurance segment’s net premiums earned by major line of business:

	Three Months Ended September 30,
	2022			2021
	Amount		%	Amount		%
Professional lines	$	341,833	28.8	$	249,007	26.5
Property, energy, marine and aviation	202,483		17.1	178,167		19.0
Programs	150,453		12.7	137,299		14.6
Excess and surplus casualty	100,175		8.4	84,048		9.0
Travel, accident and health	133,445		11.2	56,102		6.0
Construction and national accounts	109,905		9.3	104,261		11.1
Lenders products	33,253		2.8	33,030		3.5
Other	115,361		9.7	96,756		10.3
Total	$	1,186,908	100.0	$	938,670	100.0

	Nine Months Ended September 30,
	2022			2021
	Amount		%	Amount		%
Professional lines	$	945,761	28.5	$	662,776	25.3
Property, energy, marine and aviation	557,481		16.8	488,326		18.6
Programs	438,943		13.2	369,113		14.1
Excess and surplus casualty	289,305		8.7	232,314		8.9
Travel, accident and health	368,260		11.1	168,378		6.4
Construction and national accounts	306,204		9.2	317,597		12.1
Lenders products	91,435		2.8	119,507		4.6
Other	318,359		9.6	265,560		10.1
Total	$	3,315,748	100.0	$	2,623,571	100.0

Net premiums written are primarily earned on a pro rata basis over the terms of the policies for all products, usually 12 months. Net premiums earned reflect changes in net premiums written over the previous five quarters. Net premiums earned for both 2022 periods were 26.4% higher than in the 2021 periods.

Losses and Loss Adjustment Expenses.

The table below shows the components of the insurance segment’s loss ratio:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Current year	69.8	%	71.7	%	62.5	%	67.2	%
Prior period reserve development	(0.5)	%	(0.5)	%	(0.6)	%	(0.5)	%
Loss ratio	69.3	%	71.2	%	61.9	%	66.7	%

Current Year Loss Ratio.

2022 Third Quarter versus 2021 Period. The insurance segment’s current year loss ratio in the 2022 third quarter was 1.9 points lower than in the 2021 third quarter. The 2022 third quarter loss ratio reflected 13.4 points of current year catastrophic activity, primarily related to Hurricane Ian, compared to 12.2 points of catastrophic activity for the 2021 third quarter, primarily related to Hurricane Ida.

Nine Months Ended September 30, 2022 versus 2021 Period. The insurance segment’s current year loss ratio for the nine months ended September 30, 2022 was 4.7 points lower than in the 2021 period and reflected 6.1 points of current year catastrophic activity, primarily related to Hurricane Ian, Russia’s invasion of Ukraine and other natural catastrophes, compared to 7.0 points in the 2021 period. The balance of the change in the 2022 loss ratios resulted, in part, from changes in mix of business.

ARCH CAPITAL  48 2022 THIRD QUARTER FORM 10-Q

Prior Period Reserve Development.

The insurance segment’s net favorable development was $5.4 million, or 0.5 points, for the 2022 third quarter, compared to $5.1 million, or 0.5 points, for the 2021 third quarter, and $19.4 million, or 0.6 points, for the nine months ended September 30, 2022, compared to $13.1 million, or 0.5 points, for the 2021 period. See note 5, “Reserve for Losses and Loss Adjustment Expenses,” to our consolidated financial statements for information about the insurance segment’s prior year reserve development.

Underwriting Expenses.

2022 Third Quarter versus 2021 Period. The insurance segment’s underwriting expense ratio was 33.5% in the 2022 third quarter, compared to 31.0% in the 2021 third quarter. The increase in the 2022 third quarter was primarily due to growth in lines with higher acquisition costs, such as travel, higher contingent commission accruals on profitable business and a slightly lower ceded premium ratio. Partially offsetting this increase in the acquisition expense ratio was a reduction in the operating expense ratio where the growth in net earned premium outpaced the growth in operating expense.

Nine Months Ended September 30, 2022 versus 2021 period. The insurance segment’s underwriting expense ratio was 34.3% for the nine months ended September 30, 2022, compared to 31.5% for the 2021 period, with the increase primarily due to changing mix of business and growth in lines with higher acquisition costs.

Reinsurance Segment 

The following tables set forth our reinsurance segment’s underwriting results:

	Three Months Ended September 30,
	2022			2021			%  Change
Gross premiums written	$	1,639,061		$	1,251,760		30.9
Premiums ceded	(560,225)			(630,371)
Net premiums written	1,078,836			621,389			73.6
Change in unearned premiums	(77,062)			57,313
Net premiums earned	1,001,774			678,702			47.6
Other underwriting income (loss)	452			3,293
Losses and loss adjustment expenses	(927,911)			(545,846)
Acquisition expenses	(208,425)			(129,450)
Other operating expenses	(62,777)			(45,647)
Underwriting income (loss)	$	(196,887)		$	(38,948)		(405.5)
Underwriting Ratios							% Point Change
Loss ratio	92.6		%	80.4		%	12.2
Acquisition expense ratio	20.8		%	19.1		%	1.7
Other operating expense ratio	6.3		%	6.7		%	(0.4)
Combined ratio	119.7		%	106.2		%	13.5

	Nine Months Ended September 30,
	2022			2021			% Change
Gross premiums written	$	5,151,401		$	4,080,840		26.2
Premiums ceded	(1,770,807)			(1,535,607)
Net premiums written	3,380,594			2,545,233			32.8
Change in unearned premiums	(646,421)			(484,607)
Net premiums earned	2,734,173			2,060,626			32.7
Other underwriting income	5,814			3,148
Losses and loss adjustment expenses	(1,920,189)			(1,494,539)
Acquisition expenses	(569,915)			(381,060)
Other operating expenses	(198,606)			(150,856)
Underwriting income (loss)	$	51,277		$	37,319		37.4
Underwriting Ratios							% Point Change
Loss ratio	70.2		%	72.5		%	(2.3)
Acquisition expense ratio	20.8		%	18.5		%	2.3
Other operating expense ratio	7.3		%	7.3		%	—
Combined ratio	98.3		%	98.3		%	—

The reinsurance segment consists of our reinsurance underwriting units which offer specialty product lines on a worldwide basis. Reinsurance agreements are typically offered on a proportional and/or excess of loss basis and provide coverage to ceding company clients for specific underlying written policies. Product lines include:

Casualty: provides coverage on third party liability exposures including, among others, executive assurance, professional liability, excess and umbrella liability, excess motor and healthcare business, and workers’ compensation. Business is assumed primarily on a treaty basis, with some facultative coverages also offered.

Marine and aviation: provides coverage for energy, hull, cargo, specie, liability and transit, and aviation business, including airline and general aviation risks. Business written may also include space business, which includes coverages for satellite assembly, launch and operation for commercial space programs.

Other specialty: provides coverage for proportional motor reinsurance, whole account multi-line treaties, cyber, trade credit and surety, accident and health, workers’ compensation catastrophe, agriculture and political risk, among others.

Property catastrophe: provides protection for most types of catastrophic losses, including hurricane, earthquake, flood, tornado, hail and fire, and for other perils on a case-by-case basis. Excess of loss coverages are triggered when aggregate losses and loss adjustment expense from a single occurrence or aggregation of losses from a covered peril exceed the retention specified in the contract.

Property excluding property catastrophe: provides coverage for personal lines and/or commercial property exposures and principally covers buildings, structures, equipment and contents. The primary perils in this business include fire,

ARCH CAPITAL  49 2022 THIRD QUARTER FORM 10-Q

explosion, collapse, riot, vandalism, wind, tornado, flood and earthquake. Business is assumed on either a treaty basis or facultative basis.

Other: includes life reinsurance business, casualty clash business and, in limited instances, non-traditional business which is intended to provide insurers with risk management solutions that complement traditional reinsurance.

Premiums Written.

The following tables set forth our reinsurance segment’s net premiums written by major line of business:

	Three Months Ended September 30,
	2022			2021
	Amount		%	Amount		%
Other specialty	$	381,004	35.3	$	167,006	26.9
Property excluding property catastrophe	341,809		31.7	237,025		38.1
Casualty	230,308		21.3	187,066		30.1
Property catastrophe	77,606		7.2	(7,125)		(1.1)
Marine and aviation	28,633		2.7	19,159		3.1
Other	19,476		1.8	18,258		2.9
Total	$	1,078,836	100.0	$	621,389	100.0

2022 Third Quarter versus 2021 Period. Gross premiums written by the reinsurance segment in the 2022 third quarter were 30.9% higher than in the 2021 third quarter, while net premiums written were 73.6% higher. Net premiums written for the reinsurance segment in the 2021 third quarter were affected by a one time $161.2 million adjustment, resulting from retrocessions to Somers Re Ltd. (formerly known as Watford Re Ltd.) following its ownership change on July 1, 2021. Absent this item, net premiums written by the reinsurance segment were 37.9% higher than in the 2021 third quarter. The growth in net premiums written reflected increases in all lines of business, primarily related to rate increases, new business opportunities and growth in existing accounts.

	Nine Months Ended September 30,
	2022			2021
	Amount		%	Amount		%
Other specialty	$	1,179,548	34.9	$	747,662	29.4
Property excluding property catastrophe	936,270		27.7	778,959		30.6
Casualty	709,487		21.0	631,212		24.8
Property catastrophe	361,028		10.7	197,724		7.8
Marine and aviation	115,579		3.4	131,045		5.1
Other	78,682		2.3	58,631		2.3
Total	$	3,380,594	100.0	$	2,545,233	100.0

Nine Months Ended September 30, 2022 versus 2021 period. Gross premiums written by the reinsurance segment for the nine months ended September 30, 2022 were 26.2% higher than in the 2021 period, while net premiums written were 32.8% higher than in the 2021 period. The increase in net premiums written reflected growth in most lines of business,

primarily due to new business, rate increases and growth in existing accounts.

Net Premiums Earned.

The following tables set forth our reinsurance segment’s net premiums earned by major line of business:

	Three Months Ended September 30,
	2022			2021
	Amount		%	Amount		%
Other specialty	$	330,142	33.0	$	195,649	28.8
Property excluding property catastrophe	282,488		28.2	210,280		31.0
Casualty	221,636		22.1	159,697		23.5
Property catastrophe	117,820		11.8	61,107		9.0
Marine and aviation	25,182		2.5	29,818		4.4
Other	24,506		2.4	22,151		3.3
Total	$	1,001,774	100.0	$	678,702	100.0

	Nine Months Ended September 30,
	2022			2021
	Amount		%	Amount		%
Other specialty	$	846,081	30.9	$	571,364	27.7
Property excluding property catastrophe	781,562		28.6	600,842		29.2
Casualty	634,208		23.2	492,574		23.9
Property catastrophe	289,575		10.6	225,285		10.9
Marine and aviation	109,142		4.0	112,699		5.5
Other	73,605		2.7	57,862		2.8
Total	$	2,734,173	100.0	$	2,060,626	100.0

Net premiums written, irrespective of the class of business, are generally earned on a pro rata basis over the terms of the underlying policies or reinsurance contracts. Net premiums earned by the reinsurance segment in the 2022 third quarter were 47.6% higher than in the 2021 third quarter, and reflect changes in net premiums written over the previous five quarters.

Other Underwriting Income (Loss).

Other underwriting income for the 2022 third quarter was $0.5 million, compared to $3.3 million for the 2021 third quarter, and $5.8 million for the nine months ended September 30, 2022, compared to $3.1 million for the 2021 period.

Losses and Loss Adjustment Expenses.

The table below shows the components of the reinsurance segment’s loss ratio:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Current year	97.5	%	91.1	%	74.9	%	78.3	%
Prior period reserve development	(4.9)	%	(10.7)	%	(4.7)	%	(5.8)	%
Loss ratio	92.6	%	80.4	%	70.2	%	72.5	%

ARCH CAPITAL  50 2022 THIRD QUARTER FORM 10-Q

Current Year Loss Ratio.

2022 Third Quarter versus 2021 Period. The reinsurance segment’s current year loss ratio in the 2022 third quarter was 6.4 points higher than in the 2021 third quarter. The 2022 third quarter loss ratio reflected 42.8 points of current year catastrophic activity, primarily due to Hurricane Ian and other global events. The 2021 third quarter included 34.6 points of catastrophic activity, primarily related to Hurricane Ida and European floods.

Nine Months Ended September 30, 2022 versus 2021 Period. The reinsurance segment’s current year loss ratio for the nine months ended September 30, 2022 was 3.4 points lower than in the 2021 period and reflected 20.1 points of current year catastrophic activity, primarily related to Hurricane Ian, Russia’s invasion of Ukraine and other global events, compared to 20.1 points in the 2021 period.

Prior Period Reserve Development.

The reinsurance segment’s net favorable development was $49.2 million, or 4.9 points, for the 2022 third quarter, compared to $72.3 million, or 10.7 points, for the 2021 third quarter, and $128.1 million, or 4.7 points, for the nine months ended September 30, 2022, compared to $119.6 million, or 5.8 points, for the 2021 period. See note 5, “Reserve for Losses and Loss Adjustment Expenses,” to our consolidated financial statements for information about the reinsurance segment’s prior year reserve development.

Underwriting Expenses.

2022 Third Quarter versus 2021 Period. The underwriting expense ratio for the reinsurance segment was 27.1% in the 2022 third quarter, compared to 25.8% in the 2021 third quarter, with the increase primarily resulting from higher level of pro rata business, which generally has higher ceding commissions than excess of loss business. Such increase in the acquisition expense ratio was partially offset by a lower operating expense ratio due to a higher level of earned premium.

Nine Months Ended September 30, 2022 versus 2021 period. The underwriting expense ratio for the reinsurance segment was 28.1% for the nine months ended September 30, 2022, compared to 25.8% for the 2021 period. The comparison of the underwriting expense ratios also reflected changes in the mix and type of business and a higher level of net premiums earned for the 2022 period.

Mortgage Segment 

Our mortgage operations include U.S. and international mortgage insurance and reinsurance operations as well as participation in GSE credit risk-sharing transactions.

The following tables set forth our mortgage segment’s underwriting results.

	Three Months Ended September 30,
	2022			2021			% Change
Gross premiums written	$	362,409		$	360,934		0.4
Premiums ceded	(86,230)			(60,207)
Net premiums written	276,179			300,727			(8.2)
Change in unearned premiums	5,889			11,238
Net premiums earned	282,068			311,965			(9.6)
Other underwriting income	2,625			3,981
Losses and loss adjustment expenses	67,878			(11,543)
Acquisition expenses	(6,693)			(24,098)
Other operating expenses	(46,471)			(46,254)
Underwriting income	$	299,407		$	234,051		27.9
Underwriting Ratios							% Point Change
Loss ratio	(24.1)		%	3.7		%	(27.8)
Acquisition expense ratio	2.4		%	7.7		%	(5.3)
Other operating expense ratio	16.5		%	14.8		%	1.7
Combined ratio	(5.2)		%	26.2		%	(31.4)

	Nine Months Ended September 30,
	2022			2021			% Change
Gross premiums written	$	1,099,144		$	1,143,691		(3.9)
Premiums ceded	(241,097)			(171,923)
Net premiums written	858,047			971,768			(11.7)
Change in unearned premiums	9,190			10,735
Net premiums earned	867,237			982,503			(11.7)
Other underwriting income	6,130			15,026
Losses and loss adjustment expenses	187,163			(85,112)
Acquisition expenses	(27,343)			(84,297)
Other operating expenses	(150,064)			(143,697)
Underwriting income	$	883,123		$	684,423		29.0
Underwriting Ratios							% Point Change
Loss ratio	(21.6)		%	8.7		%	(30.3)
Acquisition expense ratio	3.2		%	8.6		%	(5.4)
Other operating expense ratio	17.3		%	14.6		%	2.7
Combined ratio	(1.1)		%	31.9		%	(33.0)

ARCH CAPITAL  51 2022 THIRD QUARTER FORM 10-Q

Premiums Written.

The following tables set forth our mortgage segment’s net premiums written by underwriting location:

	Three Months Ended September 30,
	2022			2021
	Amount		%	Amount		%
Underwriting location:
United States	$	188,290	68.2	$	221,315	73.6
Other	87,889		31.8	79,412		26.4
Total	$	276,179	100.0	$	300,727	100.0

2022 Third Quarter versus 2021 Period. Gross premiums written by the mortgage segment in the 2022 third quarter were 0.4% higher than in the 2021 third quarter, while net premiums written were 8.2% lower. Net premiums written for the 2022 third quarter reflected a higher level of premiums ceded than in the 2021 third quarter.

	Nine Months Ended September 30,
	2022			2021
	Amount		%	Amount		%
Underwriting location:
United States	$	590,606	68.8	$	703,489	72.4
Other	267,441		31.2	268,279		27.6
Total	$	858,047	100.0	$	971,768	100.0

Nine Months Ended September 30, 2022 versus 2021 Period. Gross premiums written by the mortgage segment for the nine months ended September 30, 2022 were 3.9% lower than in the 2021 period. The reduction in gross premiums written primarily reflected a lower U.S. primary mortgage insurance single premium volume and a decrease in monthly premiums. Net premiums written for the nine months ended September 30, 2022 were 11.7% lower than in the 2021 period and reflected a higher level of premiums ceded than in the 2021 period.

The persistency rate, which represents the percentage of mortgage insurance in force at the beginning of a 12-month period that remains in force at the end of such period, was 75.4% for the Arch MI U.S. portfolio of mortgage insurance policies at September 30, 2022, reflecting a lower level of mortgage refinancing activity, compared to 57.7% at September 30, 2021.

The following tables provide details on the new insurance written (“NIW”) generated by Arch MI U.S. NIW represents the original principal balance of all loans that received coverage during the period.

(U.S. Dollars in millions)	Three Months Ended September 30,
	2022			2021
	Amount		%	Amount		%
Total new insurance written (NIW) (1)	$	17,425		$	27,841
Credit quality (FICO):
>=740	$	11,615	66.7	$	17,514	62.9
680-739	5,322		30.5	9,012		32.4
620-679	485		2.8	1,315		4.7
<620	3		—	—		—
Total	$	17,425	100.0	$	27,841	100.0
Loan-to-value (LTV):
95.01% and above	$	973	5.6	$	1,554	5.6
90.01% to 95.00%	9,916		56.9	14,240		51.1
85.01% to 90.00%	4,839		27.8	8,394		30.1
85.00% and below	1,697		9.7	3,653		13.1
Total	$	17,425	100.0	$	27,841	100.0
Monthly vs. single:
Monthly	$	16,911	97.1	$	26,515	95.2
Single	514		2.9	1,326		4.8
Total	$	17,425	100.0	$	27,841	100.0
Purchase vs. refinance:
Purchase	$	17,159	98.5	$	25,711	92.3
Refinance	266		1.5	2,130		7.7
Total	$	17,425	100.0	$	27,841	100.0

(1)Represents the original principal balance of all loans that received coverage during the period.

ARCH CAPITAL  52 2022 THIRD QUARTER FORM 10-Q

(U.S. Dollars in millions)	Nine Months Ended September 30,
	2022			2021
	Amount		%	Amount		%
Total new insurance written (NIW) (1)	$	60,939		$	83,232
Credit quality (FICO):
>=740	$	40,888	67.1	$	54,572	65.6
680-739	18,376		30.2	25,543		30.7
620-679	1,667		2.7	3,117		3.7
<620	8		—	—		—
Total	$	60,939	100.0	$	83,232	100.0
Loan-to-value (LTV):
95.01% and above	$	3,264	5.4	$	4,646	5.6
90.01% to 95.00%	33,984		55.8	40,464		48.6
85.01% to 90.00%	17,163		28.2	25,381		30.5
85.01% and below	6,528		10.7	12,741		15.3
Total	$	60,939	100.0	$	83,232	100.0
Monthly vs. single:
Monthly	$	58,984	96.8	$	78,229	94.0
Single	1,955		3.2	5,003		6.0
Total	$	60,939	100.0	$	83,232	100.0
Purchase vs. refinance:
Purchase	$	59,375	97.4	$	71,226	85.6
Refinance	1,564		2.6	12,006		14.4
Total	$	60,939	100.0	$	83,232	100.0

Net Premiums Earned.

The following tables set forth our mortgage segment’s net premiums earned by underwriting location:

	Three Months Ended September 30,
	2022			2021
	Amount		%	Amount		%
Underwriting location:
United States	$	196,874	69.8	$	236,892	75.9
Other	85,194		30.2	75,073		24.1
Total	$	282,068	100.0	$	311,965	100.0

2022 Third Quarter versus 2021 Period. Net premiums earned for the 2022 third quarter were 9.6% lower than in the 2021 third quarter, and reflected a reduction in earnings from single premium policy terminations and a lower level of monthly premiums.

	Nine Months Ended September 30,
	2022			2021
	Amount		%	Amount		%
Underwriting location:
United States	$	615,599	71.0	$	747,830	76.1
Other	251,638		29.0	234,673		23.9
Total	$	867,237	100.0	$	982,503	100.0

Nine Months Ended September 30, 2022 versus 2021 Period. For the nine months ended September 30, 2022, net premiums earned were 11.7% lower than in the 2021 period, and reflected a lower level of earnings from single premium policy terminations and a decline in monthly premiums.

Other Underwriting Income (Loss).

Other underwriting income, which is primarily related to GSE credit risk-sharing transactions and our whole mortgage loan purchase and sell program was $2.6 million for the 2022 third quarter, compared to $4.0 million for the 2021 third quarter.

Losses and Loss Adjustment Expenses.

The table below shows the components of the mortgage segment’s loss ratio:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Current year	20.6	%	18.2	%	18.3	%	18.8	%
Prior period reserve development	(44.7)	%	(14.5)	%	(39.9)	%	(10.1)	%
Loss ratio	(24.1)	%	3.7	%	(21.6)	%	8.7	%

Current Year Loss Ratio.

2022 Third Quarter versus 2021 Period. The mortgage segment’s current year loss ratio was 2.4 points higher in the 2022 third quarter than in the 2021 third quarter. The higher current year loss ratio for the 2022 period reflected a lower level of net premiums earned in the U.S. primary mortgage insurance business.

Nine Months Ended September 30, 2022 versus 2021 Period. The mortgage segment’s current year loss ratio was 0.5 points lower for the nine months ended September 30, 2022 than for the 2021 period. The lower current year loss ratio for the 2022 period reflected lower delinquencies.

Prior Period Reserve Development.

The mortgage segment’s net favorable development was $126.2 million, or 44.7 points, for the 2022 third quarter, compared to $45.1 million, or 14.5 points, for the 2021 third quarter, and $346.4 million, or 39.9 points, for the nine months ended September 30, 2022, compared to $99.1 million, or 10.1 points, for the 2021 period. See note 5, “Reserve for Losses and Loss Adjustment Expenses,” to our consolidated financial statements for information about the mortgage segment’s prior year reserve development.

Underwriting Expenses.

2022 Third Quarter versus 2021 Period. The underwriting expense ratio for the mortgage segment was 18.9% in the 2022 third quarter, compared to 22.5% in the 2021 third quarter, with the decrease primarily due to lower acquisition expenses on Australian mortgage insurance following the acquisition of Westpac LMI in the 2021 third quarter and profit commissions adjustments related to favorable development of prior year loss reserves. Such amounts were partially offset by a lower level of net premiums earned in the U.S. primary mortgage insurance business.

ARCH CAPITAL  53 2022 THIRD QUARTER FORM 10-Q

Nine Months Ended September 30, 2022 versus 2021 period. The underwriting expense ratio for the mortgage segment was 20.5% for the nine months ended September 30, 2022, compared to 23.2% for the 2021 period, with the decrease primarily due to lower acquisition expenses on Australian mortgage insurance following the acquisition of Westpac LMI in the 2021 third quarter and profit commissions adjustments related to favorable development of prior year loss reserves. Such amounts were partially offset by a lower level of net premiums earned in the U.S. primary mortgage insurance business.

Corporate Segment

The corporate segment results include net investment income, net realized gains or losses (which includes changes in the allowance for credit losses on financial assets and net impairment losses recognized in earnings), equity in net income or loss of investments accounted for using the equity method, other income (loss), corporate expenses, transaction costs and other, amortization of intangible assets, interest expense, net foreign exchange gains or losses, income taxes, income from operating affiliates and items related to our non-cumulative preferred shares. Such amounts exclude the results of the ‘other’ segment.

Net Investment Income.

The components of net investment income were derived from the following sources:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Fixed maturities	$	123,568	$	75,964	$	310,963	$	232,690
Equity securities	4,261		9,867		16,620		23,799
Short-term investments	9,304		1,858		15,999		3,474
Other (1)	8,644		19,114		28,704		55,699
Gross investment income	145,777		106,803		372,286		315,662
Investment expenses (2)	(17,137)		(18,608)		(56,818)		(59,308)
Net investment income	$	128,640	$	88,195	$	315,468	256,354

(1)    Amounts include dividends and other distributions on investment funds, term loan investments, funds held balances, cash balances and other items.

(2)    Investment expenses were approximately 0.29% of average invested assets for the 2022 third quarter, compared to 0.32% for the 2021 third quarter, and 0.30% for the nine months ended September 30, 2022, compared to 0.32% for the 2021 period.

The higher level of net investment income for the 2022 period, primarily related to higher yields available in the financial market. The pre-tax investment income yield, calculated based on amortized cost and on an annualized basis, was 2.06% for the 2022 third quarter, compared to 1.41% for the 2021 third quarter, and 1.72% for the nine

months ended September 30, 2022, compared to 1.40% for the 2021 period.

Corporate Expenses.

Corporate expenses were $17.6 million for the 2022 third quarter, compared to $18.6 million for the 2021 third quarter, and $76.9 million for the nine months ended September 30, 2022, compared to $59.3 million for the 2021 period. The increase in corporate expenses was primarily due to higher incentive compensation costs.

Other Income (Losses)

Other loss for the 2022 third quarter was $13.7 million, compared to a loss of $4.0 million for the 2021 third quarter, and a loss of $34.5 million for the nine months ended September 30, 2022, compared to an income of $1.2 million for the 2021 period. Amounts in both periods primarily reflect changes in the cash surrender value of our investment in corporate-owned life insurance.

Transaction Costs and Other.

Transaction costs and other were $0.1 million for the 2022 third quarter, compared to $1.0 million for the 2021 third quarter, and an expense of $0.7 million for the nine months ended September 30, 2022, compared to $0.8 million for the 2021 period. Amounts in the 2022 and 2021 periods reflect acquisitions activity for the respective periods.

Amortization of Intangible Assets.

Amortization of intangible assets for the 2022 third quarter was $26.1 million, compared to $20.1 million for the 2021 third quarter, and $80.5 million for the nine months ended September 30, 2022, compared to $48.9 million for the 2021 period. Amounts in 2022 and 2021 period primarily attributed to amortization of finite-lived intangible assets. The increase in amortization of intangible assets expense was a result of acquisitions closed during the 2021 period.

Interest Expense.

Interest expense was $33.1 million for the 2022 third quarter, compared to the $33.2 million for the 2021 third quarter, and $98.6 million for the nine months ended September 30, 2022, consistent with $98.8 million for the 2021 period. Interest expense primarily reflects amounts related to our outstanding senior notes.

Net Realized Gains or Losses.

We recorded net realized losses of $183.7 million for the 2022 third quarter, of which approximately 40% represented unrealized changes in the fair value of equity securities and assets accounted for using the fair value option, compared to net realized losses of $25.0 million for the 2021 third quarter, and net realized losses of $742.7 million for the nine months ended September 30, 2022, compared to net realized gains of $239.7 million for the 2021 period. Currently, our portfolio is

ARCH CAPITAL  54 2022 THIRD QUARTER FORM 10-Q

actively managed to maximize total return within certain guidelines. The effect of financial market movements on the investment portfolio will directly impact net realized gains and losses as the portfolio is adjusted and rebalanced. Net realized gains or losses from the sale of fixed maturities primarily results from our decisions to reduce credit exposure, to change duration targets, to rebalance our portfolios or due to relative value determinations.

Net realized gains or losses also include realized and unrealized contract gains and losses on our derivative instruments, changes in the fair value of assets accounted for using the fair value option and in the fair value of equities, along with changes in the allowance for credit losses on financial assets and net impairment losses recognized in earnings. See note 7, “Investment Information—Net Realized Gains (Losses)” and note 7, “Investment Information—Allowance for Expected Credit Losses,” to our consolidated financial statements for additional information.

Equity in Net Income or Losses of Investment Funds Accounted for Using the Equity Method.

We recorded a loss of $18.9 million related to investment funds accounted for using the equity method in the 2022 third quarter, compared to an income of $105.4 million for the 2021 third quarter, and $75.5 million for the nine months ended September 30, 2022, compared to $299.3 million for the 2021 period. Such investments are generally recorded on a one to three month lag based on the availability of reports from the investment funds. Investment funds accounted for using the equity method totaled $3.6 billion at September 30, 2022, compared to $3.1 billion at December 31, 2021. See note 7, “Investment Information—Investments Accounted For Using the Equity Method,” to our consolidated financial statements for additional information.

Net Foreign Exchange Gains or Losses.

Net foreign exchange gains for the 2022 third quarter were $90.5 million, compared to net foreign exchange gains for the 2021 third quarter of $36.1 million. Net foreign exchange gains for the nine months ended September 30, 2022 were $182.1 million, compared to net foreign exchange gains for the 2021 period of $39.7 million. Amounts in both periods were primarily unrealized and resulted from the effects of revaluing our net insurance liabilities required to be settled in foreign currencies at each balance sheet date.

Income Tax Expense.

Our income tax provision on income (loss) before income taxes, including income (loss) from operating affiliates, resulted in an expense of 3.0% for the nine months ended September 30, 2022, compared to 5.8% for the 2021 period. The effective tax rate for the nine months ended September 30, 2022 and 2021 periods included discrete income tax

benefits of $36.5 million and $28.7 million, respectively. The discrete income tax benefits had the effect of decreasing the effective tax rate on net income available to Arch common shareholders by 5.7% and 1.7%, respectively. The discrete tax items in the 2022 and 2021 periods primarily related to the releases of valuation allowance on U.K. deferred tax assets. Our effective tax rate, which is based upon the expected annual effective tax rate, may fluctuate from period to period based on the relative mix of income or loss reported by jurisdiction and the varying tax rates in each jurisdiction.

Income or Losses from Operating Affiliates.

Income from operating affiliates for 2022 third quarter was $8.5 million, compared to $124.1 million for the 2021 third quarter, and $37.7 million for the nine months ended September 30, 2022, compared to $224.1 million for the 2021 period. Results for the 2021 period reflected a one-time gain of $95.7 million and $74.5 million realized from our investments in Somers and Coface SA, respectively. See note 7, “Investment Information—Investments in Operating Affiliates,” to our consolidated financial statements for additional information.

CRITICAL ACCOUNTING POLICIES,

ESTIMATES AND RECENT ACCOUNTING PRONOUNCEMENTS

Critical accounting policies, estimates and recent accounting pronouncements are discussed in Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in our 2021 Form 10-K, updated where applicable in the notes accompanying our consolidated financial statements, including note 1, “Basis of Presentation and Recent Accounting Pronouncements.”

FINANCIAL CONDITION

Investable Assets Held by Arch 

At September 30, 2022, approximately $18.3 billion, or 68.4%, of total investable assets held by Arch were internally managed, compared to $18.5 billion, or 67.3%, at December 31, 2021. See note 7, “Investment Information” to our consolidated financial statements for additional information.

	September 30, 2022,	December 31, 2021
Average effective duration (in years)	2.84	2.70
Average S&P/Moody’s credit ratings (1)	AA/Aa2	AA-/Aa3

(1)Average credit ratings on our investment portfolio on securities with ratings assigned by Standard & Poor’s Rating Services (“S&P”) and Moody’s Investors Service (“Moody’s”).

ARCH CAPITAL  55 2022 THIRD QUARTER FORM 10-Q

The following table provides the credit quality distribution of our fixed maturities. For individual fixed maturities, S&P ratings are used. In the absence of an S&P rating, ratings from Moody’s are used, followed by ratings from Fitch Ratings.

	Estimated Fair Value		% of Total
September 30, 2022
U.S. government and gov’t agencies (1)	$	5,746,853	30.8
AAA	3,344,746		17.9
AA	2,030,730		10.9
A	3,382,545		18.1
BBB	3,001,304		16.1
BB	532,162		2.9
B	357,543		1.9
Lower than B	12,417		0.1
Not rated	242,730		1.3
Total	$	18,651,030	100.0
December 31, 2021
U.S. government and gov’t agencies (1)	$	5,063,191	27.5
AAA	3,783,386		20.5
AA	2,459,413		13.4
A	2,943,594		16.0
BBB	2,936,398		15.9
BB	501,588		2.7
B	371,747		2.0
Lower than B	43,756		0.2
Not rated	311,734		1.7
Total	$	18,414,807	100.0

(1)Includes U.S. government-sponsored agency residential mortgage-backed securities and agency commercial mortgage-backed securities.

The following table provides information on the severity of the unrealized loss position as a percentage of amortized cost for all fixed maturities which were in an unrealized loss position:

Severity of gross unrealized losses:	Estimated Fair Value		Gross Unrealized Losses		% of Total Gross Unrealized Losses
September 30, 2022
0-10%	$	10,662,904	$	(551,217)	29.6
10-20%	5,851,810		(952,285)		51.2
20-30%	1,070,957		(326,093)		17.5
Greater than 30%	63,903		(31,059)		1.7
Total	$	17,649,574	$	(1,860,654)	100.0
December 31, 2021
0-10%	$	12,231,146	$	(166,867)	97.6
10-20%	16,884		(2,412)		1.4
20-30%	2,593		(759)		0.4
Greater than 30%	684		(916)		0.5
Total	$	12,251,307	$	(170,954)	100.0

The following table summarizes our top ten exposures to fixed income corporate issuers by fair value at September 30, 2022, excluding guaranteed amounts and covered bonds:

	Estimated Fair Value		Credit Rating (1)
Bank of America Corporation	$	430,809	A-/A2
JPMorgan Chase & Co.	297,868		A-/A1
Morgan Stanley	268,742		A-/A1
Citigroup Inc.	260,312		BBB+/A3
The Goldman Sachs Group, Inc.	243,516		BBB+/A2
Wells Fargo & Company	237,947		BBB+/A1
Blackstone Inc.	165,585		BBB/Baa3
Blue Owl Capital Inc.	157,904		BBB-/Baa3
UBS Group AG	125,810		A/Aa3
Dai-ichi Life Holdings, Inc.	106,357		AA-/A1
Total	$	2,294,850

(1)Average credit ratings as assigned by S&P and Moody’s, respectively.

The following table provides information on our structured securities, which includes residential mortgage-backed securities (“RMBS”), commercial mortgage-backed securities (“CMBS”) and asset-backed securities (“ABS”):

	Agencies		Investment Grade		Below Investment Grade		Total
September 30, 2022
RMBS	$	602,423	$	143,188	$	17,760	$	763,371
CMBS	18,022		957,327		88,889		1,064,238
ABS	—		1,410,672		180,970		1,591,642
Total	$	620,445	$	2,511,187	$	287,619	$	3,419,251
December 31, 2021
RMBS	$	268,229	$	129,296	$	10,952	$	408,477
CMBS	22,198		926,302		97,984		1,046,484
ABS	—		2,543,907		152,551		2,696,458
Total	$	290,427	$	3,599,505	$	261,487	$	4,151,419

The following table summarizes our equity securities, which include investments in exchange traded funds:

	September 30, 2022		December 31, 2021
Equities (1)	$	527,658	$	883,722
Exchange traded funds
Fixed income (2)	269,276		455,467
Equity and other (3)	26,840		491,474
Total	$	823,774	$	1,830,663

(1)Primarily in consumer non-cyclical, technology, communications, consumer cyclical and financial at September 30, 2022.

(2)Primarily in corporate at September 30, 2022.

(3)Primarily in large cap stocks, foreign equities, technology, healthcare and consumer discretionary at September 30, 2022.

For details on our other investments and other investable assets, see note 7, “Investment Information—Other Investments” to our consolidated financial statements.

ARCH CAPITAL  56 2022 THIRD QUARTER FORM 10-Q

For details on our investments accounted for using the equity method, see note 7, “Investment Information—Investments Accounted For Using the Equity Method,” to our consolidated financial statements.

Our investment strategy allows for the use of derivative instruments. We utilize various derivative instruments such as futures contracts to enhance investment performance, replicate investment positions or manage market exposures and duration risk that would be allowed under our investment guidelines if implemented in other ways. See note 9, “Derivative Instruments,” to our consolidated financial statements for additional disclosures related to derivatives.

Accounting guidance regarding fair value measurements addresses how companies should measure fair value when they are required to use a fair value measure for recognition or disclosure purposes under GAAP and provides a common definition of fair value to be used throughout GAAP. See note 8, “Fair Value,” to our consolidated financial statements for a summary of our financial assets and liabilities measured at fair value, segregated by level in the fair value hierarchy.

Reinsurance

The effects of reinsurance on written and earned premiums and losses and loss adjustment expenses (“LAE”) with unaffiliated reinsurers were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Premiums written:
Direct	$	2,247,480	$	1,993,098	$	6,503,383	$	5,795,236
Assumed	1,613,203		1,214,317		5,027,802		4,095,676
Ceded	(1,136,909)		(1,131,486)		(3,488,632)		(2,907,002)
Net	$	2,723,774	$	2,075,929	$	8,042,553	$	6,983,910
Premiums earned:
Direct	$	2,067,084	$	1,754,462	$	5,925,934	$	5,263,286
Assumed	1,525,027		1,129,434		4,037,580		3,169,016
Ceded	(1,121,361)		(954,559)		(3,046,356)		(2,433,634)
Net	$	2,470,750	$	1,929,337	$	6,917,158	$	5,998,668
Losses and LAE:
Direct	$	1,228,281	$	1,101,793	$	3,016,634	$	3,134,305
Assumed	1,370,308		961,285		2,661,854		2,182,852
Ceded	(915,893)		(837,059)		(1,892,301)		(1,728,207)
Net	$	1,682,696	$	1,226,019	$	3,786,187	$	3,588,950

See note 6, “Allowance for Expected Credit Losses,” to our consolidated financial statements for information about our reinsurance recoverables and related allowance for credit losses.

Bellemeade Re

We have entered into aggregate excess of loss mortgage reinsurance agreements with various special purpose reinsurance companies domiciled in Bermuda (the “Bellemeade Agreements”). For the respective coverage periods, we will retain the first layer of the respective aggregate losses and the special purpose reinsurance companies will provide second layer coverage up to the outstanding coverage amount. We will then retain losses in excess of the outstanding coverage limit. The aggregate excess of loss reinsurance coverage generally decreases over a ten-year period as the underlying covered mortgages amortize, unless provisional call options embedded within certain of the Bellemeade Agreements are executed or if pre-defined delinquency triggering events occur.

The following table summarizes the respective coverages and retentions at September 30, 2022:

Bellemeade Entities (Issue Date)	Initial Coverage at Issuance		Current Coverage		Remaining Retention, Net
2017-1 Ltd. (1)	$	368,114	$	46,772	$	137,613
2018-1 Ltd. (2)	374,460		103,131		136,200
2018-3 Ltd. (3)	506,110		217,701		143,738
2019-1 Ltd. (4)	341,790		119,193		109,450
2019-2 Ltd. (5)	621,022		347,050		182,251
2019-3 Ltd. (6)	700,920		257,663		203,047
2019-4 Ltd. (7)	577,267		283,684		136,334
2020-2 Ltd. (8)	449,167		123,049		233,262
2020-3 Ltd. (9)	451,816		276,954		159,632
2020-4 Ltd. (10)	337,013		112,191		137,694
2021-1 Ltd. (11)	643,577		540,267		152,499
2021-2 Ltd. (12)	616,017		551,307		140,012
2021-3 Ltd. (13)	639,391		627,436		136,033
2022-1 Ltd. (14)	316,760		316,760		150,269
2022-2 Ltd. (15)	327,165		327,165		222,386
Total	$	7,270,589	$	4,250,323	$	2,380,420

(1)    Issued in October 2017, covering in-force policies issued between January 1, 2017 and June 30, 2017.

(2)    Issued in April 2018, covering in-force policies issued between July 1, 2017 and December 31, 2017.

(3)    Issued in October 2018, covering in-force policies issued between January 1, 2018 and June 30, 2018.

(4)    Issued in March 2019, covering in-force policies primarily issued between 2005-2008 under United Guaranty Residential Insurance Company (“UGRIC”); as well as policies issued through 2015 under both UGRIC and Arch Mortgage Insurance Company.

(5)    Issued in April 2019, covering in-force policies issued between July 1, 2018 and December 31, 2018.

(6)    Issued in July 2019, covering in-force policies issued in 2016.

(7)    Issued in October 2019, covering in-force policies issued between January 1, 2019 and June 30, 2019.

(8)    Issued in September 2020, covering in-force policies issued between January 1, 2020 and May 31, 2020. $423 million was directly funded by Bellemeade 2020-2 Ltd. with an additional $26 million of capacity provided directly to Arch MI U.S. by a separate panel of reinsurers.

ARCH CAPITAL  57 2022 THIRD QUARTER FORM 10-Q

(9)    Issued in November 2020, covering in-force policies issued between June 1, 2020 and August 31, 2020. $418 million was directly funded by Bellemeade 2020-3 Ltd. with an additional $34 million of capacity provided directly to Arch MI U.S. by a separate panel of reinsurers.

(10) Issued in December 2020, covering in-force policies issued between July 1, 2019 and December 31, 2019. $321 million was directly funded by Bellemeade 2020-4 Ltd. with an additional $16 million of capacity provided directly to Arch MI U.S. by a separate panel of reinsurers.

(11) Issued in March 2021, covering in-force policies issued between September 1, 2020 and November 30, 2020. $580 million was directly funded by Bellemeade Re 2021-1 Ltd. with an additional $64 million capacity provided directly to Arch MI U.S. by a separate panel of reinsurers.

(12) Issued in June 2021, covering in-force policies issued between December 1, 2020 and March 31, 2021. $523 million was directly funded by Bellemeade Re 2021-2 Ltd. via insurance-linked notes, with an additional $93 million capacity provided directly to Arch MI U.S. by a separate panel of reinsurers.

(13) Issued in September 2021, covering in-force policies issued between April 1, 2021 and June 30, 2021. $508 million was directly funded by Bellemeade Re 2021-3 Ltd. via insurance-linked notes, with an additional $131 million capacity provided directly to Arch MI U.S. by a separate panel of reinsurers.

(14) Issued in January 2022, covering in-force policies issued between July 1, 2021 and November 30, 2021. $284 million was directly funded by Bellemeade Re 2022-1 Ltd. via insurance-linked notes, with an additional $33 million capacity provided directly to Arch MI U.S. by a separate panel of reinsurers.

(15) Issued in September 2022, covering in-force policies issued between November 1, 2021 and June 30, 2022. $201 million was directly funded by Bellemeade Re 2022-2 Ltd. via insurance-linked notes, with an additional $126 million capacity provided directly to Arch MI U.S. by a separate panel of reinsurers.

Reserve for Losses and Loss Adjustment Expenses 

We establish reserve for losses and loss adjustment expenses (“Loss Reserves”) which represent estimates involving actuarial and statistical projections, at a given point in time, of our expectations of the ultimate settlement and administration costs of losses incurred. Estimating Loss Reserves is inherently difficult. We utilize actuarial models as well as available historical insurance industry loss ratio experience and loss development patterns to assist in the establishment of Loss Reserves. Actual losses and loss adjustment expenses paid will deviate, perhaps substantially, from the reserve estimates reflected in our financial statements.

At September 30, 2022 and December 31, 2021, our Loss Reserves, net of unpaid losses and loss adjustment expenses recoverable, by type and by operating segment were as follows:

	September 30, 2022		December 31, 2021
Insurance segment:
Case reserves	$	2,214,924	$	2,102,891
IBNR reserves	4,797,323		4,269,904
Total net reserves	7,012,247		6,372,795
Reinsurance segment:
Case reserves	1,720,426		1,733,571
Additional case reserves	583,197		426,531
IBNR reserves	3,100,704		2,656,527
Total net reserves	5,404,327		4,816,629
Mortgage segment:
Case reserves	542,975		741,897
IBNR reserves	222,194		226,604
Total net reserves	765,169		968,501
Total:
Case reserves	4,478,325		4,578,359
Additional case reserves	583,197		426,531
IBNR reserves	8,120,221		7,153,035
Total net reserves	$	13,181,743	$	12,157,925

At September 30, 2022 and December 31, 2021, the insurance segment’s Loss Reserves by major line of business, net of unpaid losses and loss adjustment expenses recoverable, were as follows:

	September 30, 2022		December 31, 2021
Insurance segment:
Professional lines	$	1,888,083	$	1,673,615
Construction and national accounts	1,559,888		1,490,206
Programs	846,580		793,187
Excess and surplus casualty	739,676		657,307
Property, energy, marine and aviation	713,021		599,093
Travel, accident and health	132,337		96,051
Lenders products	40,960		58,351
Other	1,091,702		1,004,985
Total net reserves	$	7,012,247	$	6,372,795

At September 30, 2022 and December 31, 2021, the reinsurance segment’s Loss Reserves by major line of business, net of unpaid losses and loss adjustment expenses recoverable, were as follows:

	September 30, 2022		December 31, 2021
Reinsurance segment:
Casualty	$	2,223,204	$	2,123,360
Other specialty	1,215,362		1,113,766
Property excluding property catastrophe	971,430		711,859
Property catastrophe	586,249		486,911
Marine and aviation	270,574		246,861
Other	137,508		133,872
Total net reserves	$	5,404,327	$	4,816,629

ARCH CAPITAL  58 2022 THIRD QUARTER FORM 10-Q

At September 30, 2022 and December 31, 2021, the mortgage segment’s Loss Reserves by major line of business, net of unpaid losses and loss adjustment expenses recoverable, were as follows:

	September 30, 2022		December 31, 2021
U.S. primary mortgage insurance (1)	$	545,577	$	710,708
U.S. credit risk transfer (CRT) and other	108,667		112,549
International mortgage insurance/ reinsurance	110,925		145,244
Total net reserves	$	765,169	$	968,501

(1)    At September 30, 2022, 34.9% of total net reserves represents policy years 2012 and prior and the remainder from later policy years. At December 31, 2021, 27.9% of total net reserves represent policy years 2012 and prior and the remainder from later policy years.

Mortgage Operations Supplemental Information

The mortgage segment’s insurance in force (“IIF”) and risk in force (“RIF”) were as follows at September 30, 2022 and December 31, 2021:

(U.S. Dollars in millions)	September 30, 2022			December 31, 2021
	Amount		%	Amount		%
Insurance In Force (IIF) (1):
U.S. primary mortgage insurance	$	294,857	58.8	$	280,945	61.0
U.S. credit risk transfer (CRT) and other (2)	143,897		28.7	110,018		23.9
International mortgage insurance/reinsurance (3)	63,068		12.6	69,655		15.1
Total	$	501,822	100.0	$	460,618	100.0
Risk In Force (RIF) (4):
U.S. primary mortgage insurance	$	75,343	85.1	$	70,619	84.3
U.S. credit risk transfer (CRT) and other (2)	6,473		7.3	5,120		6.1
International mortgage insurance/reinsurance (3)	6,727		7.6	7,983		9.5
Total	$	88,543	100.0	$	83,722	100.0

(1)Represents the aggregate dollar amount of each insured mortgage loan’s current principal balance.

(2)Includes all CRT transactions, which are predominantly with GSEs, and other U.S. reinsurance transactions.

(3)International mortgage insurance and reinsurance with risk primarily located in Australia and to lesser extent Europe and Asia.

(4)The aggregate dollar amount of each insured mortgage loan’s current principal balance multiplied by the insurance coverage percentage specified in the policy for insurance policies issued and after contract limits and/or loss ratio caps for risk-sharing or reinsurance.

The IIF and RIF for our U.S. primary mortgage insurance business by policy year were as follows at September 30, 2022:

(U.S. Dollars in millions)	IIF			RIF			Delinquency
	Amount		%	Amount		%	Rate (1)
Policy year:
2012 and prior	$	10,362	3.5	$	2,509	3.3	8.22	%
2013	3,196		1.1	855		1.1	2.12	%
2014	3,903		1.3	1,071		1.4	2.61	%
2015	6,607		2.2	1,780		2.4	2.11	%
2016	11,021		3.7	2,953		3.9	2.47	%
2017	10,017		3.4	2,654		3.5	3.27	%
2018	10,744		3.6	2,742		3.6	3.95	%
2019	19,961		6.8	5,038		6.7	2.24	%
2020	68,974		23.4	17,294		23.0	0.87	%
2021	91,486		31.0	23,152		30.7	0.66	%
2022	58,586		19.9	15,295		20.3	0.17	%
Total	$	294,857	100.0	$	75,343	100.0	1.73	%

(1)Represents the ending percentage of loans in default.

The IIF and RIF for our U.S. primary mortgage insurance business by policy year were as follows at December 31, 2021:

(U.S. Dollars in millions)	IIF			RIF			Delinquency
	Amount		%	Amount		%	Rate (1)
Policy year:
2012 and prior	$	13,030	4.6	$	2,960	4.2	8.48	%
2013	4,206		1.5	1,148		1.6	2.63	%
2014	4,822		1.7	1,328		1.9	3.14	%
2015	8,703		3.1	2,340		3.3	2.67	%
2016	14,344		5.1	3,841		5.4	3.29	%
2017	13,128		4.7	3,436		4.9	4.09	%
2018	14,046		5.0	3,562		5.0	5.28	%
2019	25,841		9.2	6,467		9.2	3.13	%
2020	82,502		29.4	20,341		28.8	0.97	%
2021	100,323		35.7	25,196		35.7	0.29	%
Total	$	280,945	100.0	$	70,619	100.0	2.36	%

(1)Represents the ending percentage of loans in default.

ARCH CAPITAL  59 2022 THIRD QUARTER FORM 10-Q

The following tables provide supplemental disclosures on risk in force for our U.S. primary mortgage insurance business at September 30, 2022 and December 31, 2021:

(U.S. Dollars in millions)	September 30, 2022				December 31, 2021
	Amount			%	Amount			%
Credit quality (FICO):
>=740	$	46,538		61.8	$	42,451		60.1
680-739	24,671			32.7	23,646			33.5
620-679	3,850			5.1	4,196			5.9
<620	284			0.4	326			0.5
Total	$	75,343		100.0	$	70,619		100.0
Weighted average FICO score	748				746
Loan-to-value (LTV):
95.01% and above	$	7,334		9.7	$	7,538		10.7
90.01% to 95.00%	43,049			57.1	38,829			55.0
85.01% to 90.00%	20,876			27.7	20,006			28.3
85.00% and below	4,084			5.4	4,246			6.0
Total	$	75,343		100.0	$	70,619		100.0
Weighted average LTV	92.9		%		92.8		%
Total RIF, net of external reinsurance	$	56,890			$	54,574

(U.S. Dollars in millions)	September 30, 2022			December 31, 2021
	Amount		%	Amount		%
Total RIF by State:
California	$	6,219	8.3	$	5,559	7.9
Texas	6,080		8.1	5,594		7.9
Florida	3,275		4.3	3,303		4.7
Georgia	3,150		4.2	2,902		4.1
North Carolina	3,139		4.2	2,921		4.1
Illinois	3,087		4.1	2,933		4.2
Minnesota	2,996		4.0	2,916		4.1
Massachusetts	2,771		3.7	2,537		3.6
Virginia	2,647		3.5	2,446		3.5
Michigan	2,587		3.4	2,492		3.5
Other	39,392		52.3	37,016		52.4
Total	$	75,343	100.0	$	70,619	100.0

The following table provides supplemental disclosures for our U.S. primary mortgage insurance business related to insured loans and loss metrics:

(U.S. Dollars in thousands, except policy, loan and claim count)	Nine Months Ended
	September 30,
	2022			2021
Roll-forward of insured loans in default:
Beginning delinquent number of loans	27,645			52,234
New notices	26,328			26,483
Cures	(33,225)			(46,334)
Paid claims	(534)			(613)
Ending delinquent number of loans (1)	20,214			31,770
Ending number of policies in force (1)	1,168,735			1,188,768
Delinquency rate (1)	1.73		%	2.67		%
Losses:
Number of claims paid	534			613
Total paid claims	$	16,865		$	22,848
Average per claim	$	31.6		$	37.3
Severity (2)	74.3		%	80.2		%
Average case reserve per default (in thousands) (1)	$	27.7		$	23.5

(1)Includes first lien primary and pool policies.

(2)Represents total paid claims divided by RIF of loans for which claims were paid.

The risk to capital ratio, which represents total current (non-delinquent) risk in force, net of reinsurance, divided by total statutory capital, for Arch MI U.S. was approximately 7.6 to 1 at September 30, 2022, compared to 8 to 1 at December 31, 2021.

Shareholders’ Equity and Book Value per Share

The following table presents the calculation of book value per share:

(U.S. dollars in thousands, except  share data)	September 30, 2022		December 31, 2021
Total shareholders’ equity available to Arch	$	11,795,110	$	13,545,896
Less preferred shareholders’ equity	830,000		830,000
Common shareholders’ equity available to Arch	$	10,965,110	$	12,715,896
Common shares and common share equivalents outstanding, net of treasury shares (1)	369,321,990		378,923,894
Book value per share	$	29.69	$	33.56

(1)Excludes the effects of 15,628,546 and 17,083,160 stock options and 560,945 and 729,636 restricted stock units outstanding at September 30, 2022 and December 31, 2021, respectively.

ARCH CAPITAL  60 2022 THIRD QUARTER FORM 10-Q

LIQUIDITY

Liquidity is a measure of our ability to access sufficient cash flows to meet the short-term and long-term cash requirements of our business operations.

Arch Capital is a holding company whose assets primarily consist of the shares in its subsidiaries. Generally, Arch Capital depends on its available cash resources, liquid investments and dividends or other distributions from its subsidiaries to make payments, including the payment of debt service obligations and operating expenses it may incur and any dividends or liquidation amounts with respect to our preferred and common shares.

For the nine months ended September 30, 2022, Arch Capital received dividends of $735.3 million from Arch Reinsurance Ltd. (“Arch Re Bermuda”), our Bermuda based reinsurer and insurer which can pay approximately $3.1 billion to Arch Capital during the remainder of 2022 without providing an affidavit to the Bermuda Monetary Authority.

We expect that our liquidity needs, including our anticipated (re)insurance obligations and operating and capital expenditure needs, for at least the next twelve months and thereafter for the forseable future, will be met by funds generated from underwriting activities and investment income, as well as by our balance of cash, short-term investments, proceeds on the sale or maturity of our investments, and our credit facilities. On April 7, 2022 Arch Capital and certain of its subsidiaries amended the existing credit agreement. For details on our credit agreement, see note 10, “Commitments and Contingencies” to our consolidated financial statements.

Cash Flows

The following table summarizes our cash flows from operating, investing and financing activities.

	Nine Months Ended
	September 30,
	2022		2021
Total cash provided by (used for):
Operating activities	$	2,833,717	$	2,580,697
Investing activities	(2,106,721)		(1,184,436)
Financing activities	(703,877)		(895,943)
Effects of exchange rate changes on foreign currency cash	(79,566)		(30,501)
Increase (decrease) in cash and restricted cash	$	(56,447)	$	469,817

•Cash provided by operating activities for the nine months ended September 30, 2022 primarily reflected a higher level premium volume than in the 2021 period.

•Cash used for investing activities for the nine months ended September 30, 2022 was higher than in the 2021 period. Activity for the 2022 period reflected a lower level of proceeds from sales and redemptions of fixed

income securities. Activity for the 2021 period reflected cash used to invest in Coface and Somers.

•Cash used for financing activities for the nine months ended September 30, 2022 reflected $585.8 million of repurchases under our share repurchase program. Activity for the 2021 period, reflected $872.2 million of repurchases under our share repurchase program.

CAPITAL RESOURCES

The following table provides an analysis of our capital structure:

(U.S. dollars in thousands, except  share data)	September 30, 2022		December 31, 2021
Senior notes	$	2,725,153	$	2,724,394
Shareholders’ equity available to Arch:
Series F non-cumulative preferred shares	330,000		330,000
Series G non-cumulative preferred shares	500,000		500,000
Common shareholders’ equity	10,965,110		12,715,896
Total	$	11,795,110	$	13,545,896
Total capital available to Arch	$	14,520,263	$	16,270,290
Debt to total capital (%)	18.8		16.7
Preferred to total capital (%)	5.7		5.1
Debt and preferred to total capital (%)	24.5		21.8

Arch MI U.S. is required to maintain compliance with the GSEs requirements, known as the Private Mortgage Insurer Eligibility Requirements or “PMIERs.” The financial requirements require an eligible mortgage insurer’s available assets, which generally include only the most liquid assets of an insurer, to meet or exceed “minimum required assets” as of each quarter end. Minimum required assets are calculated from PMIERs tables with several risk dimensions (including origination year, original loan-to-value and original credit score of performing loans, and the delinquency status of non-performing loans) and are subject to a minimum amount. Arch MI U.S. satisfied the PMIERs’ financial requirements as of September 30, 2022 with an estimated PMIER sufficiency ratio of 237%, compared to 197% at December 31, 2021.

Arch Capital, through its subsidiaries, provides financial support to certain of its insurance subsidiaries and affiliates, through certain reinsurance arrangements beneficial to the ratings of such subsidiaries. Historically, our insurance, reinsurance and mortgage insurance subsidiaries have entered into separate reinsurance arrangements with Arch Re Bermuda covering individual lines of business.

ARCH CAPITAL  61 2022 THIRD QUARTER FORM 10-Q

GUARANTOR INFORMATION

The below table provides a description of our senior notes payable at September 30, 2022:

	Interest		Principal		Carrying
Issuer/Due	(Fixed)		Amount		Amount
Arch Capital:
May 1, 2034	7.350	%	$	300,000	$	297,585
June 30, 2050	3.635	%	1,000,000		988,891
Arch-U.S.:
Nov. 1, 2043 (1)	5.144	%	500,000		495,156
Arch Finance:
Dec. 15, 2026 (1)	4.011	%	500,000		497,962
Dec. 15, 2046 (1)	5.031	%	450,000		445,559
Total			$	2,750,000	$	2,725,153

(1)Fully and unconditionally guaranteed by Arch Capital.

Our senior notes were issued by Arch Capital, Arch Capital Group (U.S.) Inc. (“Arch-U.S.”) and Arch Capital Finance LLC (“Arch Finance”). Arch-U.S. is a wholly-owned subsidiary of Arch Capital and Arch Finance is a wholly-owned finance subsidiary of Arch-U.S. Our 2034 senior notes and 2050 senior notes issued by Arch Capital are unsecured and unsubordinated obligations of Arch Capital and ranked equally with all of its existing and future unsecured and unsubordinated indebtedness. The 2043 senior notes issued by Arch-U.S. are unsecured and unsubordinated obligations of Arch-U.S. and Arch Capital and rank equally and ratably with the other unsecured and unsubordinated indebtedness of Arch-U.S. and Arch Capital. The 2026 senior notes and 2046 senior notes issued by Arch Finance are unsecured and unsubordinated obligations of Arch Finance and Arch Capital and rank equally and ratably with the other unsecured and unsubordinated indebtedness of Arch Finance and Arch Capital.

Arch-U.S. and Arch Finance depend on their available cash resources, liquid investments and dividends or other distributions from their subsidiaries or affiliates to make payments, including the payment of debt service obligations and operating expenses they may incur.

The following tables present condensed financial information for Arch Capital (parent guarantor) and Arch-U.S. (subsidiary issuer):

	September 30, 2022
	Arch Capital		Arch-U.S.
Assets
Total investments	$	47,722	$	169,143
Cash	12,798		7,463
Investment in operating affiliates	5,448		—
Due from subsidiaries and affiliates	1,485		15
Other assets	7,437		29,346
Total assets	$	74,890	$	205,967
Liabilities
Senior notes	1,286,476		495,156
Due to subsidiaries and affiliates	1,838		507,103
Other liabilities	36,038		41,580
Total liabilities	$	1,324,352	$	1,043,839
Non-cumulative preferred shares	$	830,000	—

	December 31, 2021
	Arch Capital		Arch-U.S.
Assets
Total investments	$	2,038	$	137,124
Cash	16,317		18,392
Investment in operating affiliates	6,877		—
Due from subsidiaries and affiliates	—		26,000
Other assets	9,615		37,040
Total assets	$	34,847	$	218,556
Liabilities
Senior notes	1,286,208		495,063
Due to subsidiaries and affiliates	—		521,839
Other liabilities	24,767		47,410
Total liabilities	$	1,310,975	$	1,064,312
Non-cumulative preferred shares	$	830,000	—

	September 30, 2022
Nine Months Ended	Arch Capital		Arch-U.S.
Revenues
Net investment income	$	1,349	$	600
Net realized gains (losses)	23		(338)
Equity in net income (loss) of investments accounted for using the equity method	—		6,913
Total revenues	1,372		7,175
Expenses
Corporate expenses	70,048		10,882
Interest expense	44,068		35,328
Total expenses	114,116		46,210
Income (loss) before income taxes and income (loss) from operating affiliates	(112,744)		(39,035)
Income tax (expense) benefit	—		7,918
Income (loss) from operating affiliates	(758)		—
Net income available to Arch	(113,502)		(31,117)
Preferred dividends	(30,552)		—
Net income (loss) available to Arch common shareholders	$	(144,054)	$	(31,117)

ARCH CAPITAL  62 2022 THIRD QUARTER FORM 10-Q

	December 31, 2021
Year Ended	Arch Capital		Arch-U.S.
Revenues
Net investment income	1,524		11,596
Net realized gains (losses)	—		72,437
Equity in net income (loss) of investments accounted for using the equity method	—		18,149
Total revenues	1,524		102,182
Expenses
Corporate expenses	71,818		5,875
Interest expense	58,741		47,292
Net foreign exchange (gains) losses	7		—
Total expenses	130,566		53,167
Income (loss) before income taxes and income (loss) from operating affiliates	(129,042)		49,015
Income tax (expense) benefit	—		(12,513)
Income (loss) from operating affiliates	(590)		—
Net income available to Arch	(129,632)		36,502
Preferred dividends	(48,343)		—
Loss on redemption of preferred shares	(15,101)		—
Net income (loss) available to Arch common shareholders	$	(193,076)	$	36,502

SHARE REPURCHASE PROGRAM

The board of directors of Arch Capital has authorized the investment in Arch Capital’s common shares through a share repurchase program. For the nine months ended September 30, 2022, Arch Capital repurchased 12.9 million shares under the share repurchase program with an aggregate purchase price of $585.8 million. Since the inception of the share repurchase program through September 30, 2022, Arch Capital has repurchased 433.6 million common shares for an aggregate purchase price of $5.9 billion. At September 30, 2022, approximately $596.4 million of share repurchases were available under the program. The timing and amount of the repurchase transactions under this program will depend on a variety of factors, including market conditions and corporate and regulatory considerations. We will continue to monitor our share price and, depending upon results of operations, market conditions and the development of the economy, as well as other factors, we will consider share repurchases on an opportunistic basis.

CATASTROPHIC EVENTS AND SEVERE ECONOMIC EVENTS

We have large aggregate exposures to natural and man-made catastrophic events, pandemic events like COVID-19 and severe economic events. Natural catastrophes can be caused by various events, including hurricanes, floods, windstorms, earthquakes, hailstorms, tornadoes, explosions, severe winter weather, fires, droughts and other natural disasters. Man-made catastrophic events may include acts of war, acts of terrorism and political instability. Catastrophes can also cause

losses in non-property business such as mortgage insurance, workers’ compensation or general liability. In addition to the nature of property business, we believe that economic and geographic trends affecting insured property, including inflation, property value appreciation and geographic concentration, tend to generally increase the size of losses from catastrophic events over time.

Our models employ both proprietary and vendor-based systems and include cross-line correlations for property, marine, offshore energy, aviation, workers compensation and personal accident. We seek to limit the probable maximum pre-tax loss to a specific level for severe catastrophic events. Currently, we seek to limit our 1-in-250 year return period net probable maximum loss from a severe catastrophic event in any geographic zone to approximately 25% of tangible shareholders’ equity available to Arch (total shareholders’ equity available to Arch less goodwill and intangible assets). We reserve the right to change this threshold at any time.

Based on in-force exposure estimated as of October 1, 2022, our modeled peak zone catastrophe exposure was a windstorm affecting the Florida Tri-County, with a net probable maximum pre-tax loss of $851 million, followed by windstorms affecting the Gulf of Mexico and the Northeastern U.S. regions with net probable maximum pre-tax losses of $748 and $747 million, respectively. Our exposures to other perils, such as U.S. earthquake and international events, were less than the exposures arising from U.S. windstorms and hurricanes. As of October 1, 2022, our modeled peak zone earthquake exposure (San Francisco earthquake) represented approximately 69% of our peak zone catastrophe exposure, and our modeled peak zone international exposure (UK windstorm) was substantially less than both our peak zone windstorm and earthquake exposures.

We also have significant exposure to losses due to mortgage defaults resulting from severe economic events in the future. For our U.S. mortgage insurance business, we have developed a proprietary risk model (“Realistic Disaster Scenario” or “RDS”) that simulates the maximum loss resulting from a severe economic downturn impacting the housing market. The RDS models the collective impact of adverse conditions for key economic indicators, the most significant of which is a decline in home prices. The RDS model projects paths of future home prices, unemployment rates, income levels and interest rates and assumes correlation across states and geographic regions. The resulting future performance of our in-force portfolio is then estimated under the economic stress scenario, reflecting loan and borrower information.

Currently, we seek to limit our modeled RDS loss from a severe economic event to approximately 25% of tangible shareholders’ equity available to Arch. We reserve the right to change this threshold at any time. Based on in-force

ARCH CAPITAL  63 2022 THIRD QUARTER FORM 10-Q

exposure estimated as of October 1, 2022, our modeled RDS loss was approximately 10% of tangible shareholders’ equity available to Arch.

Net probable maximum loss estimates are net of expected reinsurance recoveries, before income tax and before excess reinsurance reinstatement premiums. RDS loss estimates are net of expected reinsurance recoveries and before income tax. Catastrophe loss estimates are reflective of the zone indicated and not the entire portfolio. Since hurricanes and windstorms can affect more than one zone and make multiple landfalls, our catastrophe loss estimates include clash estimates from other zones. Our catastrophe loss estimates and RDS loss estimates do not represent our maximum exposures and it is highly likely that our actual incurred losses would vary materially from the modeled estimates. There can be no assurances that we will not suffer pre-tax losses greater than 25% of our tangible shareholders’ equity from one or more catastrophic events or severe economic events due to several factors. These factors include the inherent uncertainties in estimating the frequency and severity of such events and the margin of error in making such determinations resulting from potential inaccuracies and inadequacies in the data provided by clients and brokers, the modeling techniques and the application of such techniques or as a result of a decision to change the percentage of shareholders' equity exposed to a single catastrophic event or severe economic event. In addition, actual losses may increase if our reinsurers fail to meet their obligations to us or the reinsurance protections purchased by us are exhausted or are otherwise unavailable. See “Risk Factors—Risks Relating to Our Industry” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Catastrophic Events and Severe Economic Events” in our 2021 Form 10-K.

MARKET SENSITIVE INSTRUMENTS AND RISK MANAGEMENT

In accordance with the SEC’s Financial Reporting Release No. 48, we performed a sensitivity analysis to determine the effects that market risk exposures could have on the future earnings, fair values or cash flows of our financial instruments as of September 30, 2022. Market risk represents the risk of changes in the fair value of a financial instrument and is comprised of several components, including liquidity, basis and price risks.

An analysis of material changes in market risk exposures at September 30, 2022 that affect the quantitative and qualitative disclosures presented in our 2021 Form 10-K (see section captioned “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Market Sensitive Instruments and Risk Management”) were as follows: 

Investment Market Risk

Fixed Income Securities. We invest in interest rate sensitive securities, primarily debt securities. We consider the effect of interest rate movements on the fair value of our fixed maturities, short-term investments and certain of our other investments, equity securities and investment funds accounted for using the equity method which invest in fixed income securities (collectively, “Fixed Income Securities”) and the corresponding change in unrealized appreciation. As interest rates rise, the fair value of our Fixed Income Securities falls, and the converse is also true. Based on historical observations, there is a low probability that all interest rate yield curves would shift in the same direction at the same time. Furthermore, at times interest rate movements in certain credit sectors exhibit a much lower correlation to changes in U.S. Treasury yields. Accordingly, the actual effect of interest rate movements may differ materially from the amounts set forth in the following tables.

The following table summarizes the effect that an immediate, parallel shift in the interest rate yield curve would have had on our Fixed Income Securities:

(U.S. dollars in  billions)	Interest Rate Shift in Basis Points
	-100			-50			—		+50			+100
September 30, 2022
Total fair value	$	25.75		$	25.40		$	25.05	$	24.70		$	24.37
Change from base	2.8		%	1.4		%			(1.4)		%	(2.7)		%
Change in unrealized value	$	0.70		$	0.35				$	(0.35)		$	(0.68)
December 31, 2021
Total fair value	$	25.79		$	25.44		$	25.21	$	24.75		$	24.43
Change from base	2.3		%	0.9		%			(1.8)		%	(3.1)		%
Change in unrealized value	$	0.58		$	0.23				$	(0.45)		$	(0.78)

In addition, we consider the effect of credit spread movements on the market value of our Fixed Income Securities and the corresponding change in unrealized value. As credit spreads widen, the fair value of our Fixed Income Securities falls, and the converse is also true. In periods where the spreads on our Fixed Income Securities are much higher than their historical average due to short-term market dislocations, a parallel shift in credit spread levels would result in a much more pronounced change in unrealized value.

ARCH CAPITAL  64 2022 THIRD QUARTER FORM 10-Q

The following table summarizes the effect that an immediate, parallel shift in credit spreads in a static interest rate environment would have had on our Fixed Income Securities:

(U.S. dollars in  billions)	Credit Spread Shift in Percentage Points
	-100			-50			—		+50			+100
September 30, 2022
Total fair value	$	26.03		$	25.54		$	25.05	$	24.56		$	24.07
Change from base	3.9		%	2.0		%			(2.0)		%	(3.9)		%
Change in unrealized value	$	0.98		$	0.49				$	(0.49)		$	(0.98)
December 31, 2021
Total fair value	$	26.17		$	25.69		$	25.21	$	24.72		$	24.24
Change from base	3.8		%	1.9		%			(1.9)		%	(3.8)		%
Change in unrealized value	$	0.97		$	0.48				$	(0.48)		$	(0.97)

Another method that attempts to measure portfolio risk is Value-at-Risk (“VaR”). VaR measures the worst expected loss under normal market conditions over a specific time interval at a given confidence level. The 1-year 95th percentile parametric VaR reported herein estimates that 95% of the time, the portfolio loss in a one-year horizon would be less than or equal to the calculated number, stated as a percentage of the measured portfolio’s initial value. The VaR is a variance-covariance based estimate, based on linear sensitivities of a portfolio to a broad set of systematic market risk factors and idiosyncratic risk factors mapped to the portfolio exposures. The relationships between the risk factors are estimated using historical data, and the most recent data points are generally given more weight. As of September 30, 2022, our portfolio’s VaR was estimated to be 7.9% compared to an estimated 4.8% at December 31, 2021. In periods where the volatility of the risk factors mapped to our portfolio’s exposures is higher due to market conditions, the resulting VaR is higher than in other periods.

Equity Securities. At September 30, 2022 and December 31, 2021, the fair value of our investments in equity securities and certain investments accounted for using the equity method with underlying equity strategies totaled $0.8 billion and $1.4 billion, respectively. These investments are exposed to price risk, which is the potential loss arising from decreases in fair value. An immediate hypothetical 10% decline in the value of each position would reduce the fair value of such investments by approximately $81.9 million and $137.5 million at September 30, 2022 and December 31, 2021, respectively, and would have decreased book value per share by approximately $0.22 and $0.36, respectively. An immediate hypothetical 10% increase in the value of each position would increase the fair value of such investments by approximately $81.9 million and $137.5 million at September 30, 2022 and December 31, 2021, respectively, and would have increased book value per share by approximately $0.22 and $0.36, respectively.

Investment-Related Derivatives. At September 30, 2022, the notional value of all derivative instruments (excluding foreign currency forward contracts which are included in the foreign currency exchange risk analysis below) was $5.9 billion, compared to $6.4 billion at December 31, 2021. If the underlying exposure of each investment-related derivative held at September 30, 2022 depreciated by 100 basis points, it would have resulted in a reduction in net income of approximately $58.6 million, and a decrease in book value per share of approximately $0.16 per share, compared to $63.8 million and $0.17 per share, respectively, on investment-related derivatives held at December 31, 2021. If the underlying exposure of each investment-related derivative held at September 30, 2022 appreciated by 100 basis points, it would have resulted in an increase in net income of approximately $58.6 million, and an increase in book value per share of approximately $0.16 per share, compared to $63.8 million and $0.17 per share, respectively, on investment-related derivatives held at December 31, 2021. See note 9, “Derivative Instruments,” to our consolidated financial statements for additional disclosures concerning derivatives.

For further discussion on investment activity, please refer to “Financial Condition—Investable Assets.”

ARCH CAPITAL  65 2022 THIRD QUARTER FORM 10-Q

Foreign Currency Exchange Risk

Foreign currency rate risk is the potential change in value, income and cash flow arising from adverse changes in foreign currency exchange rates. Through our subsidiaries and branches located in various foreign countries, we conduct our insurance and reinsurance operations in a variety of local currencies other than the U.S. Dollar. We generally hold investments in foreign currencies which are intended to mitigate our exposure to foreign currency fluctuations in our net insurance liabilities. We may also utilize foreign currency forward contracts and currency options as part of our investment strategy. See note 9, “Derivative Instruments,” to our consolidated financial statements for additional information.

The following table provides a summary of our net foreign currency exchange exposures, as well as foreign currency derivatives in place to manage these exposures:

(U.S. dollars in thousands, except  per share data)	September 30, 2022		December 31, 2021
Net assets (liabilities), denominated in foreign currencies, excluding shareholders’ equity and derivatives	$	(366,136)	$	(825,371)
Shareholders’ equity denominated in foreign currencies (1)	978,889		1,095,706
Net foreign currency forward contracts outstanding (2)	8,369		15,151
Net exposures denominated in foreign currencies	$	621,122	$	285,486
Pre-tax impact of a hypothetical 10% appreciation of the U.S. Dollar against foreign currencies:
Shareholders’ equity	$	(62,112)	$	(28,549)
Book value per share	$	(0.17)	$	(0.08)
Pre-tax impact of a hypothetical 10% decline of the U.S. Dollar against foreign currencies:
Shareholders’ equity	$	62,112	$	28,549
Book value per share	$	0.17	$	0.08

(1)    Represents capital contributions held in the foreign currencies of our operating units.

(2)    Represents the net notional value of outstanding foreign currency forward contracts.

Although we generally attempt to match the currency of our projected liabilities with investments in the same currencies, from time to time we may elect to over or underweight one or more currencies, which could increase our exposure to foreign currency fluctuations and increase the volatility of our shareholders’ equity. Historical observations indicate a low probability that all foreign currency exchange rates would shift against the U.S. Dollar in the same direction and at the same time and, accordingly, the actual effect of foreign currency rate movements may differ materially from the

amounts set forth above. For further discussion on foreign exchange activity, please refer to “Results of Operations.”

Effects of Inflation

General economic inflation has increased in recent quarters and may continue to remain at elevated levels for an extended period of time. The potential also exists, after a catastrophe loss or pandemic events like COVID-19, for the development of inflationary pressures in a local economy. This may have a material effect on the adequacy of our reserves for losses and loss adjustment expenses, especially in longer-tailed lines of business, and on the market value of our investment portfolio through rising interest rates. The anticipated effects of inflation are considered in our pricing models, reserving processes and exposure management, across all lines of business and types of loss including natural catastrophe events. The actual effects of inflation on our results cannot be accurately known until claims are ultimately settled and will vary by the specific type of inflation affecting each line of business.

OTHER FINANCIAL INFORMATION

The consolidated financial statements as of September 30, 2022 have been reviewed by PricewaterhouseCoopers LLP, the registrant's independent public accountants, whose report is included as an exhibit to this filing. The report of PricewaterhouseCoopers LLP states that they did not audit and they do not express an opinion on that unaudited financial information. Accordingly, the degree of reliance on their report on such information should be restricted in light of the limited nature of the review procedures applied. PricewaterhouseCoopers LLP is not subject to the liability provisions of Section 11 of the Securities Act of 1933 for their report on the unaudited financial information because that report is not a "report" or a "part" of the registration statement prepared or certified by PricewaterhouseCoopers LLP within the meaning of Sections 7 and 11 of the Securities Act of 1933.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Reference is made to the information appearing above under the subheading “Market Sensitive Instruments and Risk Management” under the caption “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” which information is hereby incorporated by reference.

ARCH CAPITAL  66 2022 THIRD QUARTER FORM 10-Q

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

In connection with the filing of this Form 10-Q, our management, including the Chief Executive Officer and Chief Financial Officer, conducted an evaluation, as of the end of the period covered by this report, for the purposes set forth in the applicable rules under the Securities and Exchange Act of 1934, as amended (the “Exchange Act”). Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that the disclosure controls and procedures were effective as of the end of and during the period covered by this report with respect to information being recorded, processed, summarized and reported within time periods specified in the SEC’s rules and forms and with respect to timely communication to them and other members of management responsible for preparing periodic reports of all material information required to be disclosed in this report as it relates to Arch Capital and its consolidated subsidiaries.

We continue to enhance our operating procedures and internal controls to effectively support our business and our regulatory and reporting requirements. Our management does not expect that our disclosure controls or our internal controls will prevent all errors and all fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. As a result of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within the company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of simple error or mistake. Additionally, controls can be circumvented by the individual acts of some persons or by collusion of two or more people. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions; over time, controls may become inadequate because of changes in conditions, or the degree of compliance with the policies or procedures may deteriorate. As a result of the inherent limitations in a cost-effective control system, misstatement due to error or fraud may occur and not be detected. Accordingly, our disclosure controls and procedures are designed to provide reasonable, not absolute, assurance that the disclosure controls and procedures are met.

Changes in Internal Controls Over Financial Reporting

There have been no changes in internal control over financial reporting that occurred during the quarter ended September 30, 2022 that have materially affected, or are reasonably likely to materially affect, internal control over financial reporting. We have not experienced any material impact to our internal controls over financial reporting.

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

We, in common with the insurance industry in general, are subject to litigation and arbitration in the normal course of our business. As of September 30, 2022, we were not a party to any litigation or arbitration which is expected by management to have a material adverse effect on our results of operations and financial condition and liquidity.

ITEM 1A. RISK FACTORS

There were no material changes from the risk factors previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2021.

ARCH CAPITAL  67 2022 THIRD QUARTER FORM 10-Q

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Issuer’s Repurchases of Equity Securities

The following table summarizes our purchases of common shares for the 2022 third quarter:

Period	Total Number of Shares Purchased (1)	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Approximate Dollar Value of Shares that  May Yet be Purchased Under the Plan or Programs ($000’s) (2)
7/1/2022-7/31/2022	235,544	$	42.97	233,177	$	596,541
8/1/2022-8/31//2022	24,798	45.56		3,017	$	596,411
9/1/2022-9/30/2022	10,739	46.31		—	$	596,411
Total	271,081	$	43.34	236,194

(1)This column represents open market share repurchases, including an aggregate of 2,367, 21,781, and 10,739 shares repurchased by Arch Capital during July, August and September, respectively, other than through publicly announced plans or programs. We repurchased these shares from employees in order to facilitate the payment of withholding taxes on restricted shares granted and the exercise of stock appreciation rights, in each case at their fair value as determined by reference to the closing price of our common shares on the day the restricted shares vested or the stock appreciation rights were exercised.

(2)This column represents the remaining approximate dollar amount available at the end of each applicable period under Arch Capital’s $1.5 billion share repurchase authorization from October 8, 2021. Repurchases may be effected from time to time in open market or privately negotiated transactions through December 31, 2022.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. OTHER INFORMATION

In accordance with Section 10a(i)(2) of the Securities and Exchange Act of 1934, as amended, we are responsible for disclosing non-audit services to be provided by our independent auditor, PricewaterhouseCoopers LLP, which are approved by the Audit Committee of our board of directors. During the 2022 third quarter, the Audit Committee approved engagements of PricewaterhouseCoopers LLP for permitted non-audit services, which consisted of tax consulting services, tax compliance services and other accounting consulting services.

ARCH CAPITAL  68 2022 THIRD QUARTER FORM 10-Q

ITEM 6. EXHIBITS

		Incorporated by Reference
Exhibit Number	Exhibit Description	Form	Original Number	Date Filed	Filed Herewith
15	Accountants’ Awareness Letter (regarding unaudited interim financial information)				X
31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002				X
31.2	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002				X
32.1	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002				X
32.2	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002				X
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document
104	Cover Page Interactive Data File (embedded within the Inline XBRL document)

ARCH CAPITAL  69 2022 THIRD QUARTER FORM 10-Q

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	ARCH CAPITAL GROUP LTD.
	(REGISTRANT)
	/s/ Marc Grandisson
Date: November 3, 2022	Marc Grandisson
	Chief Executive Officer (Principal Executive Officer)
	/s/ François Morin
Date: November 3, 2022	François Morin
	Executive Vice President, Chief Financial Officer (Principal Financial and Accounting Officer) and Treasurer

ARCH CAPITAL  70 2022 THIRD QUARTER FORM 10-Q

EX-15

Exhibit 15

November 3, 2022

Securities and Exchange Commission

100 F Street, N.E.

Washington, DC 20549

Commissioners:

We are aware that our report dated November 3, 2022, on our review of interim financial information of Arch Capital Group Ltd., which appears in this Quarterly Report on Form 10-Q, is incorporated by reference in the Registration Statements on Form S-3 (No. 333-250869) and in the Registration Statements on Form S-8 (Nos. 333-265285, 333-224783, 333-211193, 333-142835, 333-181308 and 333- 203993) of Arch Capital Group Ltd.

Very truly yours,

/s/ PricewaterhouseCoopers LLP

New York, New York

EX-31.1

Exhibit 31.1

Certification

of Chief Executive Officer

Pursuant to Section 302 of the

Sarbanes-Oxley Act of 2002

I, Marc Grandisson, certify that:

1.    I have reviewed this quarterly report on Form 10-Q of Arch Capital Group Ltd.;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in the report;

4.    The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.    Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.    Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.    The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	November 3, 2022
By:	/s/ Marc Grandisson
Name:	Marc Grandisson
Title:	Chief Executive Officer

EX-31.2

Exhibit 31.2

Certification

of Chief Financial Officer

Pursuant to Section 302 of the

Sarbanes-Oxley Act of 2002

I, François Morin, certify that:

1.     I have reviewed this quarterly report on Form 10-Q of Arch Capital Group Ltd.;

2.     Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.     Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in the report;

4.     The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.     Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.     Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.     Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.     Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.     The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.     All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.     Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	November 3, 2022
By:	/s/ François Morin
Name:	François Morin
Title:	Executive Vice President, Chief Financial Officer and Treasurer

EX-32.1

Exhibit 32.1

Certification Pursuant to Chapter 63, Title 18 United States Code §1350

As Adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

    In connection with the Quarterly Report of Arch Capital Group Ltd. (the “Company”) on Form 10-Q for the period ending September 30, 2022 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Marc Grandisson, as Chief Executive Officer of the Company, certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    the Report fully complies with the requirements of section 13(a) of the Securities Exchange Act of 1934; and

(2)    the information contained in such report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	November 3, 2022
By:	/s/ Marc Grandisson
Name:	Marc Grandisson
Title:	Chief Executive Officer

A signed original of this written statement required by Section 906 or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to Arch Capital Group Ltd. and will be retained by Arch Capital Group Ltd. and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

Certification Pursuant to Chapter 63, Title 18 United States Code §1350

As Adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

    In connection with the Quarterly Report of Arch Capital Group Ltd. (the “Company”) on Form 10-Q for the period ending September 30, 2022 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), François Morin, as Executive Vice President, Chief Financial Officer and Treasurer of the Company, certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    the Report fully complies with the requirements of section 13(a) of the Securities Exchange Act of 1934; and

(2)    the information contained in such report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	November 3, 2022
By:	/s/ François Morin
Name:	François Morin
Title:	Executive Vice President, Chief Financial Officer and Treasurer

A signed original of this written statement required by Section 906 or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to Arch Capital Group Ltd. and will be retained by Arch Capital Group Ltd. and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2022	Oct. 31, 2022
Document and Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	001-16209
Entity Registrant Name	ARCH CAPITAL GROUP LTD.
Entity Incorporation, State or Country Code	D0
Entity Tax Identification Number	98-0374481
Entity Address, Address Line One	Waterloo House, Ground Floor
Entity Address, Address Line Two	100 Pitts Bay Road,
Entity Address, City or Town	Pembroke
Entity Address, Postal Zip Code	HM 08,
Entity Address, Country	BM
City Area Code	(441)
Local Phone Number	278-9250
Entity Listings [Line Items]
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		369,873,027
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2022
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000947484
Amendment Flag	false
Common shares
Entity Listings [Line Items]
Title of 12(b) Security	Common shares, $0.0011 par value per share
Trading Symbol	ACGL
Security Exchange Name	NASDAQ
Series F Depositary Share Equivalent
Entity Listings [Line Items]
Title of 12(b) Security	Depositary shares, each representing a 1/1000th interest in a 5.45% Series F preferred share
Trading Symbol	ACGLO
Security Exchange Name	NASDAQ
Series G Depositary Share Equivalent
Entity Listings [Line Items]
Title of 12(b) Security	Depositary shares, each representing a 1/1000th interest in a 4.55% Series G preferred share
Trading Symbol	ACGLN
Security Exchange Name	NASDAQ

XML

Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Investments:
Debt securities available for sale, at fair value	$ 20,061,584	$ 19,732,825
Equity securities, at fair value	809,869	1,804,170
Other investments, at fair value	1,578,751	1,973,550
Investments accounted for using the equity method	3,565,946	3,077,611
Total investments	26,016,150	26,588,156
Cash	813,583	858,668
Accrued investment income	116,263	85,453
Investment in operating affiliates	891,212	1,135,655
Premiums receivable (net of allowance for credit losses: $38,229 and $39,958)	3,579,380	2,633,280
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses (net of allowance for credit losses: $17,366 and $13,230)	6,356,456	5,880,735
Contractholder receivables (net of allowance for credit losses: $2,360 and $3,437)	1,735,730	1,828,691
Ceded unearned premiums	2,115,539	1,729,455
Deferred acquisition costs	1,122,711	901,841
Receivable for securities sold	27,042	60,179
Goodwill and intangible assets	806,655	944,983
Other assets	2,756,383	2,453,849
Total assets	46,337,104	45,100,945
Liabilities
Reserve for losses and loss adjustment expenses	19,288,291	17,757,156
Unearned premiums	7,271,279	6,011,942
Reinsurance balances payable	1,669,592	1,583,253
Contractholder payables	1,738,089	1,832,127
Collateral held for insured obligations	254,720	242,352
Senior notes	2,725,153	2,724,394
Payable for securities purchased	174,769	64,850
Other liabilities	1,411,193	1,329,742
Total liabilities	34,533,086	31,545,816
Commitments and Contingencies
Redeemable noncontrolling interests	8,908	9,233
Shareholders' Equity
Non-cumulative preferred shares	830,000	830,000
Common shares ($0.0011 par, shares issued: 587,134,047 and 583,289,850)	652	648
Additional paid-in capital	2,186,599	2,085,075
Retained earnings	15,042,561	14,455,868
Accumulated other comprehensive income (loss), net of deferred income tax	(1,891,827)	(64,600)
Common shares held in treasury, at cost (shares: 217,812,057 and 204,365,956)	(4,372,875)	(3,761,095)
Total shareholders' equity available to Arch	11,795,110	13,545,896
Total liabilities, noncontrolling interests and shareholders' equity	46,337,104	45,100,945
Fixed maturities available for sale, at fair value (amortized cost: $19,913,055 and $17,973,823; net of allowance for credit losses: $45,993 and $2,883)
Investments:
Debt securities available for sale, at fair value	18,120,727	17,998,109
Short-term investments available for sale, at fair value (amortized cost: $1,941,071 and $1,734,738; net of allowance for credit losses: $0 and $0)
Investments:
Debt securities available for sale, at fair value	$ 1,940,857	$ 1,734,716

XML

Unaudited Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Available for sale securities, amortized cost	$ 21,854,126	$ 19,708,561
Allowance for credit losses on investments	45,993	2,883
Allowance for credit losses on premiums receivable	38,229	39,958
Allowance for credit losses on reinsurance recoverable	17,366	13,230
Allowance for credit losses on contractholder receivable	$ 2,360	$ 3,437
Common shares, par value per share	$ 0.0011	$ 0.0011
Common shares issued (shares)	587,134,047	583,289,850
Common shares held in treasury (shares)	217,812,057	204,365,956
Fixed maturities
Available for sale securities, amortized cost	$ 19,913,055	$ 17,973,823
Allowance for credit losses on investments	45,993	2,883
Short-term investments
Available for sale securities, amortized cost	1,941,071	1,734,738
Allowance for credit losses on investments	$ 0	$ 0

XML

Unaudited Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues
Net premiums earned	$ 2,470,750	$ 1,929,337	$ 6,917,158	$ 5,998,668
Net investment income	128,640	88,195	315,468	298,664
Net realized gains (losses)	(183,673)	(25,040)	(742,666)	320,328
Other underwriting income	3,077	7,274	11,944	18,913
Equity in net income (loss) of investment funds accounted for using the equity method	(18,861)	105,398	75,505	299,270
Other income (loss)	(13,684)	(3,960)	(34,486)	1,151
Total revenues	2,386,249	2,101,204	6,542,923	6,936,994
Expenses
Losses and loss adjustment expenses	1,682,696	1,226,019	3,786,187	3,588,950
Acquisition expenses	447,587	306,015	1,239,065	945,639
Other operating expenses	274,747	230,832	842,082	736,808
Corporate expenses	17,710	19,672	77,662	61,007
Amortization of intangible assets	26,104	20,135	80,478	49,823
Interest expense	33,063	33,176	98,566	107,222
Net foreign exchange (gains) losses	(90,509)	(36,078)	(182,129)	(38,366)
Total expenses	2,391,398	1,799,771	5,941,911	5,451,083
Income (loss) before income taxes and income (loss) from operating affiliates	(5,149)	301,433	601,012	1,485,911
Income tax expense	14,900	(4,137)	(19,042)	(94,176)
Income (loss) from operating affiliates	8,507	124,119	37,665	224,052
Net income (loss)	18,258	421,415	619,635	1,615,787
Net (income) loss attributable to noncontrolling interests	(1,157)	(1,473)	(2,390)	(82,203)
Net income (loss) available to Arch	17,101	419,942	617,245	1,533,584
Preferred dividends	(10,184)	(16,090)	(30,552)	(38,159)
Loss on redemption of preferred shares	0	(15,101)	0	(15,101)
Net income (loss) available to Arch common shareholders	$ 6,917	$ 388,751	$ 586,693	$ 1,480,324
Net income per common share and common share equivalent
Basic (per share)	$ 0.02	$ 1.00	$ 1.59	$ 3.74
Diluted (per share)	$ 0.02	$ 0.98	$ 1.55	$ 3.66
Weighted average common shares and common share equivalents outstanding
Basic (shares)	365,190,527	389,274,220	369,525,348	395,899,591
Diluted (shares)	373,727,277	397,903,347	378,373,180	404,260,485

XML

Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Comprehensive Income
Net income (loss)	$ 18,258	$ 421,415	$ 619,635	$ 1,615,787
Unrealized appreciation (decline) in value of available-for-sale investments:
Unrealized holding gains (losses) arising during period	(609,759)	(95,923)	(1,892,119)	(279,102)
Reclassification of net realized (gains) losses, included in net income (loss)	46,585	(62,654)	206,573	(120,504)
Foreign currency translation adjustments	(70,388)	(31,710)	(141,681)	(54,089)
Comprehensive income (loss)	(615,304)	231,128	(1,207,592)	1,162,092
Net (income) loss attributable to noncontrolling interests	(1,157)	(1,473)	(2,390)	(82,203)
Other comprehensive (income) loss attributable to noncontrolling interests	0	9,423	0	13,983
Comprehensive income (loss) available to Arch	$ (616,461)	$ 239,078	$ (1,209,982)	$ 1,093,872

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Unaudited Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Non-cumulative preferred shares	Common shares	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss), net of deferred income tax	Unrealized appreciation (decline) in value of available-for-sale securities, net of deferred income tax	Foreign currency translation adjustments, net of deferred income tax	Common shares held in treasury, at cost
Balance at beginning of period at Dec. 31, 2020		$ 780,000	$ 643	$ 1,977,794	$ 12,362,463	$ 488,895	$ 501,295	$ (12,400)	$ (2,503,909)
Preferred shares issued		500,000
Preferred shares redeemed		(450,000)
Common shares issued, net			5
Amortization of share-based compensation				71,279
Issue costs on preferred shares				(14,179)
Loss on redemption of preferred shares	$ (15,101)			15,101	(15,101)
Other changes				11,911
Net income (loss)	1,615,787				1,615,787
Net (income) loss attributable to noncontrolling interests	(82,203)				(82,203)
Preferred share dividends	(38,159)				(38,159)
Unrealized holding gains (losses) during period, net of reclassification adjustment							(399,606)
Unrealized holding gains (losses) during period attributable to noncontrolling interests							15,188
Foreign currency translation adjustments	(54,089)							(54,089)
Foreign currency translation adjustments attributable to noncontrolling interests								(1,204)
Shares repurchased for treasury									(893,090)
Balance at end of period at Sep. 30, 2021	13,387,526	830,000	648	2,061,906	13,842,787	49,184	116,877	(67,693)	(3,396,999)
Balance at beginning of period at Jun. 30, 2021		1,280,000	647	2,028,919	13,454,036	230,048	264,702	(34,654)	(3,007,578)
Preferred shares issued		0
Preferred shares redeemed		(450,000)
Common shares issued, net			1
Amortization of share-based compensation				14,216
Issue costs on preferred shares				0
Loss on redemption of preferred shares	(15,101)			15,101	(15,101)
Other changes				3,670
Net income (loss)	421,415				421,415
Net (income) loss attributable to noncontrolling interests	(1,473)				(1,473)
Preferred share dividends	(16,090)				(16,090)
Unrealized holding gains (losses) during period, net of reclassification adjustment							(158,577)
Unrealized holding gains (losses) during period attributable to noncontrolling interests							10,752
Foreign currency translation adjustments	(31,710)							(31,710)
Foreign currency translation adjustments attributable to noncontrolling interests								(1,329)
Shares repurchased for treasury									(389,421)
Balance at end of period at Sep. 30, 2021	13,387,526	830,000	648	2,061,906	13,842,787	49,184	116,877	(67,693)	(3,396,999)
Balance at beginning of period at Dec. 31, 2021	13,545,896	830,000	648	2,085,075	14,455,868	(64,600)	13,486	(78,086)	(3,761,095)
Preferred shares issued		0
Preferred shares redeemed		0
Common shares issued, net			4
Amortization of share-based compensation				80,023
Issue costs on preferred shares				0
Loss on redemption of preferred shares	0			0	0
Other changes				21,501
Net income (loss)	619,635				619,635
Net (income) loss attributable to noncontrolling interests	(2,390)				(2,390)
Preferred share dividends	(30,552)				(30,552)
Unrealized holding gains (losses) during period, net of reclassification adjustment							(1,685,546)
Unrealized holding gains (losses) during period attributable to noncontrolling interests							0
Foreign currency translation adjustments	(141,681)							(141,681)
Foreign currency translation adjustments attributable to noncontrolling interests								0
Shares repurchased for treasury									(611,780)
Balance at end of period at Sep. 30, 2022	11,795,110	830,000	652	2,186,599	15,042,561	(1,891,827)	(1,672,060)	(219,767)	(4,372,875)
Balance at beginning of period at Jun. 30, 2022		830,000	652	2,170,661	15,035,644	(1,258,265)	(1,108,886)	(149,379)	(4,361,126)
Preferred shares issued		0
Preferred shares redeemed		0
Common shares issued, net			0
Amortization of share-based compensation				13,518
Issue costs on preferred shares				0
Loss on redemption of preferred shares	0			0	0
Other changes				2,420
Net income (loss)	18,258				18,258
Net (income) loss attributable to noncontrolling interests	(1,157)				(1,157)
Preferred share dividends	(10,184)				(10,184)
Unrealized holding gains (losses) during period, net of reclassification adjustment							(563,174)
Unrealized holding gains (losses) during period attributable to noncontrolling interests							0
Foreign currency translation adjustments	(70,388)							(70,388)
Foreign currency translation adjustments attributable to noncontrolling interests								0
Shares repurchased for treasury									(11,749)
Balance at end of period at Sep. 30, 2022	$ 11,795,110	$ 830,000	$ 652	$ 2,186,599	$ 15,042,561	$ (1,891,827)	$ (1,672,060)	$ (219,767)	$ (4,372,875)

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Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities
Net income (loss)	$ 619,635	$ 1,615,787
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Net realized (gains) losses	742,680	(367,313)
Equity in net (income) or loss of investment funds accounted for using the equity method and other income or loss	106,405	(372,650)
Amortization of intangible assets	80,478	49,823
Share-based compensation	80,029	72,303
Changes in:
Reserve for losses and loss adjustment expenses, net of unpaid losses and loss adjustment expenses recoverable	1,553,084	1,548,211
Unearned premiums, net of ceded unearned premiums	1,125,395	985,242
Premiums receivable	(1,095,741)	(847,098)
Deferred acquisition costs	(242,377)	(247,966)
Reinsurance balances payable	128,418	618,571
Other items, net	(264,289)	(427,359)
Net cash provided by operating activities	2,833,717	2,627,551
Investing Activities
Purchases of fixed maturity investments	(13,065,302)	(29,870,023)
Purchases of equity securities	(786,733)	(978,951)
Purchases of other investments	(1,270,099)	(1,350,056)
Proceeds from sales of fixed maturity investments	9,990,418	30,067,792
Proceeds from sales of equity securities	1,539,808	695,633
Proceeds from sales, redemptions and maturities of other investments	1,075,679	1,487,919
Proceeds from redemptions and maturities of fixed maturity investments	577,864	1,234,412
Net settlements of derivative instruments	(106,347)	(67,830)
Net (purchases) sales of short-term investments	(151,980)	(1,172,798)
Purchase of operating affiliate	0	(753,916)
Impact of the deconsolidation of the variable interest entity	0	(349,202)
Purchases of fixed assets	(38,383)	(34,407)
Other	128,354	(361,857)
Net cash used for investing activities	(2,106,721)	(1,453,284)
Financing Activities
Proceeds from issuance of preferred shares, net	0	485,821
Redemption of preferred shares	0	(450,000)
Purchases of common shares under share repurchase program	(585,823)	(872,197)
Proceeds from common shares issued, net	(2,863)	281
Third party investment in non-redeemable noncontrolling interests	0	15,971
Dividends paid to redeemable noncontrolling interests	0	(1,907)
Other	(84,639)	(21,752)
Preferred dividends paid	(30,552)	(38,096)
Net cash used for financing activities	(703,877)	(881,879)
Effects of exchange rate changes on foreign currency cash and restricted cash	(79,566)	(34,023)
Increase (decrease) in cash and restricted cash	(56,447)	258,365
Cash and restricted cash, beginning of year	1,314,771	1,290,544
Cash and restricted cash, end of period	$ 1,258,324	$ 1,548,909

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Basis of Presentation and Recent Accounting Pronouncements

9 Months Ended

Sep. 30, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation and Recent Accounting Pronouncements

General

Arch Capital Group Ltd. (“Arch Capital”) is a public listed Bermuda exempted company which provides insurance, reinsurance and mortgage insurance on a worldwide basis through its wholly-owned subsidiaries. As used herein, the “Company” means Arch Capital and its subsidiaries. The Company’s consolidated financial statements through June 30, 2021 included the results of Somers Group Holdings Ltd. (formerly Watford Holdings Ltd.) and its wholly owned subsidiaries (“Somers”). Effective July 1, 2021, Somers is wholly owned by Greysbridge Holdings Ltd., (“Greysbridge”) and Greysbridge is owned 40% by the Company, 30% by certain investment funds managed by Kelso & Company (“Kelso”) and 30% by certain investment funds managed by Warburg Pincus LLC (“Warburg”). Based on the governing documents of Greysbridge, the Company concluded that, while it retains significant influence over Somers, Somers no longer constitutes a variable interest entity. Accordingly, effective July 1, 2021, Arch no longer consolidates the results of Somers in its consolidated financial statements and footnotes. See note 11.

Basis of Presentation

The interim consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). All significant intercompany transactions and balances have been eliminated in consolidation. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates and assumptions. In the opinion of management, the accompanying unaudited interim consolidated financial statements reflect all adjustments (consisting of normally recurring accruals) necessary for a fair statement of results on an interim basis. The results of any interim period are not necessarily indicative of the results for a full year or any future periods.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted; however, management believes that the disclosures are adequate to make the information presented not misleading. This report should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2021

(“2021 Form 10-K”), including the Company’s audited consolidated financial statements and related notes.

The Company has reclassified the presentation of certain prior year information to conform to the current presentation. Such reclassifications had no effect on the Company’s net income, comprehensive income, shareholders’ equity or cash flows. Tabular amounts are in U.S. Dollars in thousands, except share amounts, unless otherwise noted.

Recent Accounting Pronouncements

Inflation Reduction Act of 2022

On August 16, 2022, the U.S. government enacted the Inflation Reduction Act of 2022, which among other things implements a 15% minimum tax on book income of certain large corporations, a 1% excise tax on net stock repurchases and several tax incentives to promote clean energy. The effective date of these provisions is January 1, 2023. Based on its current analysis of the provisions, the Company does not expect that this legislation will have a material effect on the Company’s consolidated financial statements.

Recently Issued Accounting Standards Adopted

For information regarding additional accounting standards that the Company has not yet adopted, see note 3(s), “Significant Accounting Policies—Recent Accounting Pronouncements,” of the notes to consolidated financial statements in the Company’s 2021 Form 10-K.

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Share Transactions

9 Months Ended

Sep. 30, 2022

Stockholders' Equity Note [Abstract]

Share Transactions

Share Repurchases 

The board of directors of Arch Capital has authorized the investment in Arch Capital’s common shares through a share repurchase program. Since the inception of the share repurchase program, Arch Capital has repurchased 433.6 million common shares for an aggregate purchase price of $5.87 billion. For the nine months ended September 30, 2022, Arch Capital repurchased 12.9 million shares under the share repurchase program with an aggregate purchase price of $585.8 million. At September 30, 2022, $596.4 million of share repurchases were available under the program, which may be effected from time to time in open market or privately negotiated transactions. The timing and amount of the repurchase transactions under this program will depend on a variety of factors, including market conditions and corporate and regulatory considerations.

The 2022 Long-Term Incentive and Share Award Plan (the“2022 Plan”)

The 2022 Plan became effective as of May 4, 2022 following approval by shareholders of the Company. The 2022 Plan provides for the issuance of stock options, stock appreciation rights, restricted shares, restricted share units payable in common shares or cash, dividend equivalents, performance shares and performance units and other share-based awards to Arch Capital’s eligible employees and directors. The number of common shares reserved for grants under the 2022 Plan, subject to anti-dilution adjustments in the event of certain changes in Arch Capital’s capital structure, is 9,000,000; provided, that no more than 6,000,000 common shares may be issued as incentive stock options under Section 422 of the Code. The 2022 Plan will terminate as to future awards on February 25, 2032. At September 30, 2022, 9,000,000 shares are available for future issuance.

Series G Preferred Shares

In June 2021, Arch Capital completed a $500 million underwritten public offering of 20.0 million depositary shares (the “Depositary Shares”), each of which represents a 1/1,000th interest in a share of its 4.55% Non-Cumulative Preferred Shares, Series G $0.01 par value and $25,000 liquidation preference per share (equivalent to $25 liquidation preference per Depositary Share) (the “Series G Preferred Shares”). Each Depositary Share, evidenced by a depositary receipt, entitles the holder, through the depositary, to a proportional fractional interest in all rights and preferences of the Series G Preferred Shares represented thereby (including any dividend, liquidation, redemption and voting rights).

Holders of Series G Preferred Shares will be entitled to receive dividend payments only when, as and if declared by the Company’s board of directors or a duly authorized committee of the board. Any such dividends will be payable from, and including, the date of original issue on a noncumulative basis, quarterly in arrears on the last day of March, June, September and December of each year, at an annual rate of 4.55%. Dividends on the Series G Preferred Shares are not cumulative. The Company will be restricted from paying dividends on or repurchasing its common shares unless certain dividend payments are made on the Series G

Preferred Shares. The Company may not declare or pay a dividend on the Series G Preferred Shares under certain circumstances, including if the Company is or, after giving effect to such payment, would be in breach of applicable individual or group solvency and liquidity requirements or applicable individual or group enhanced capital requirements (“ECR”). The Series G Preferred Shares may not be redeemed at any time if the ECR would be breached immediately before or after giving effect to such redemption, unless the Company replaces the capital represented by preference shares to be redeemed with capital having equal or better capital treatment.

Except in specified circumstances relating to certain tax or corporate events, the Series G Preferred Shares are not redeemable prior to June 11, 2026. On and after that date, the Series G Preferred Shares will be redeemable at the Company’s option, in whole or in part, at a redemption price of $25,000 per share of the Series G Preferred Shares (equivalent to $25 per depositary share), plus any declared and unpaid dividends, without accumulation of any undeclared dividends to, but excluding, the redemption date.

The Depositary Shares will be redeemed if and to the extent the related Series G Preferred Shares are redeemed by the Company. Neither the Depositary Shares nor the Series G Preferred Shares have a stated maturity, nor will they be subject to any sinking fund or mandatory redemption. The Series G Preferred Shares are not convertible into any other securities. The Series G Preferred Shares do not have voting rights, except under limited circumstances.

The net proceeds from the Series G Preferred Shares offering of approximately $485.8 million were used to redeem the Company’s issued and outstanding 5.25% Series E Non-Cumulative Preferred Shares in September 2021. The preferred shares were redeemed at a redemption price equal to $25 per depositary share, plus all declared and unpaid dividends to (but excluding) the redemption date. In accordance with GAAP, following the redemption, original issuance costs related to such shares have been removed from additional paid-in capital and recorded as a “loss on redemption of preferred shares.” Such adjustment had no impact on total shareholders’ equity or cash flows.

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Earnings Per Common Share

9 Months Ended

Sep. 30, 2022

Earnings Per Share [Abstract]

Earnings Per Common Share

The following table sets forth the computation of basic and diluted earnings per common share:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Numerator:
Net income (loss)	$	18,258	$	421,415	$	619,635	$	1,615,787
Amounts attributable to noncontrolling interests	(1,157)		(1,473)		(2,390)		(82,203)
Net income (loss) available to Arch	17,101		419,942		617,245		1,533,584
Preferred dividends	(10,184)		(16,090)		(30,552)		(38,159)
Loss on redemption of preferred shares	—		(15,101)		—		(15,101)
Net income (loss) available to Arch common shareholders	$	6,917	$	388,751	$	586,693	$	1,480,324
Denominator:
Weighted average common shares and common share equivalents outstanding — basic	365,190,527		389,274,220		369,525,348		395,899,591
Effect of dilutive common share equivalents:
Nonvested restricted shares	2,351,039		2,131,915		2,171,158		1,877,930
Stock options (1)	6,185,711		6,497,212		6,676,674		6,482,964
Weighted average common shares and common share equivalents outstanding — diluted	373,727,277		397,903,347		378,373,180		404,260,485
Earnings per common share:
Basic	$	0.02	$	1.00	$	1.59	$	3.74
Diluted	$	0.02	$	0.98	$	1.55	$	3.66

(1)    Certain stock options were not included in the computation of diluted earnings per share where the exercise price of the stock options exceeded the average market price and would have been anti-dilutive or where, when applying the treasury stock method to in-the-money options, the sum of the proceeds, including unrecognized compensation, exceeded the average market price and would have been anti-dilutive. For the 2022 third quarter and 2021 third quarter, the number of stock options excluded were 774,481 and 1,948,006, respectively. For the nine months ended September 30, 2022 and 2021, the number of stock options excluded were 785,682 and 2,397,507, respectively.

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Segment Information

9 Months Ended

Sep. 30, 2022

Segment Reporting [Abstract]

Segment Information

The Company classifies its businesses into three underwriting segments — insurance, reinsurance and mortgage — and two other operating segments — corporate and ‘other.’ The Company determined its reportable segments using the management approach described in accounting guidance regarding disclosures about segments of an enterprise and related information. The accounting policies of the segments are the same as those used for the preparation of the Company’s consolidated financial statements. Intersegment business is allocated to the segment accountable for the underwriting results.

The Company’s insurance, reinsurance and mortgage segments each have managers who are responsible for the overall profitability of their respective segments and who are directly accountable to the Company’s chief operating decision makers, the Chief Executive Officer of Arch Capital, the Chief Financial Officer and Treasurer of Arch Capital and the President and Chief Underwriting Officer of Arch Capital. The chief operating decision makers do not assess performance, measure return on equity or make resource allocation decisions on a line of business basis. Management measures segment performance for its three underwriting segments based on underwriting income or loss. The Company does not manage its assets by underwriting segment, with the exception of goodwill and intangible assets, and accordingly, investment income is not allocated to each underwriting segment.

The insurance segment consists of the Company’s insurance underwriting units which offer specialty product lines on a worldwide basis. Product lines include: construction and national accounts; excess and surplus casualty; lenders products; professional lines; programs; property, energy, marine and aviation; travel, accident and health; and other (consisting of alternative markets, excess workers' compensation and surety business).

The reinsurance segment consists of the Company’s reinsurance underwriting units which offer specialty product lines on a worldwide basis. Product lines include: casualty; marine and aviation; other specialty; property catastrophe; property excluding property catastrophe (losses on a single risk, both excess of loss and pro rata); and other (consisting of life reinsurance, casualty clash and other).

The mortgage segment includes the Company’s U.S. primary mortgage insurance business, investment and services related to U.S. credit-risk transfer (“CRT”) which are predominately with government sponsored enterprises (“GSE’s”) and international mortgage insurance and reinsurance operations. Arch Mortgage Insurance Company and United Guaranty Residential Insurance Company (combined “Arch MI U.S.”) are approved as eligible mortgage insurers by Federal National Mortgage Association (“Fannie Mae”) and Federal Home Loan Mortgage Corporation (“Freddie Mac”), each a GSE. Arch MI U.S. also includes Arch Mortgage Guaranty Company, which is not a GSE-approved entity.

The corporate segment results include net investment income, net realized gains or losses (which includes changes in the allowance for credit losses on financial assets and net impairment losses recognized in earnings), equity in net income or loss of investments accounted for using the equity method, other income (loss), corporate expenses, transaction costs and other, amortization of intangible assets, interest expense, net foreign exchange gains or losses, income taxes, income or loss from operating affiliates and items related to the Company’s non-cumulative preferred shares. Such amounts exclude the results of the ‘other’ segment.

Through June 30, 2021, the ‘other’ segment included the results of Somers. In July 2021, the Company announced the completion of the previously disclosed acquisition of Somers by Greysbridge. Based on the governing documents of Greysbridge, the Company has concluded that, while it retains significant influence over Somers, Somers no longer constitutes a variable interest entity. Accordingly, effective July 1, 2021, Arch no longer consolidates the results of Somers in its consolidated financial statements. See note 11.

The following tables summarize the Company’s underwriting income or loss by segment, together with a reconciliation of underwriting income or loss to net income available to Arch common shareholders:

	Three Months Ended
	September 30, 2022
	Insurance			Reinsurance			Mortgage			Sub-Total			Other			Total
Gross premiums written (1)	$	1,862,026		$	1,639,061		$	362,409		$	3,860,683		$	—		$	3,860,683
Premiums ceded	(493,267)			(560,225)			(86,230)			(1,136,909)			—			(1,136,909)
Net premiums written	1,368,759			1,078,836			276,179			2,723,774			—			2,723,774
Change in unearned premiums	(181,851)			(77,062)			5,889			(253,024)			—			(253,024)
Net premiums earned	1,186,908			1,001,774			282,068			2,470,750			—			2,470,750
Other underwriting income (loss)	—			452			2,625			3,077			—			3,077
Losses and loss adjustment expenses	(822,663)			(927,911)			67,878			(1,682,696)			—			(1,682,696)
Acquisition expenses	(232,469)			(208,425)			(6,693)			(447,587)			—			(447,587)
Other operating expenses	(165,499)			(62,777)			(46,471)			(274,747)			—			(274,747)
Underwriting income (loss)	$	(33,723)		$	(196,887)		$	299,407		68,797			—			68,797
Net investment income										128,640			—			128,640
Net realized gains (losses)										(183,673)			—			(183,673)
Equity in net income (loss) of investment funds accounted for using the equity method										(18,861)			—			(18,861)
Other income (loss)										(13,684)			—			(13,684)
Corporate expenses (2)										(17,634)			—			(17,634)
Transaction costs and other (2)										(76)			—			(76)
Amortization of intangible assets										(26,104)			—			(26,104)
Interest expense										(33,063)			—			(33,063)
Net foreign exchange gains (losses)										90,509			—			90,509
Income (loss) before income taxes and income (loss) from operating affiliates										(5,149)			—			(5,149)
Income tax (expense) benefit										14,900			—			14,900
Income (loss) from operating affiliates										8,507			—			8,507
Net income (loss)										18,258			—			18,258
Amounts attributable to redeemable noncontrolling interests										(1,157)			—			(1,157)
Net income (loss) available to Arch										17,101			—			17,101
Preferred dividends										(10,184)			—			(10,184)
Net income (loss) available to Arch common shareholders										$	6,917		$	—		$	6,917
Underwriting Ratios
Loss ratio	69.3		%	92.6		%	(24.1)		%	68.1		%	—		%	68.1		%
Acquisition expense ratio	19.6		%	20.8		%	2.4		%	18.1		%	—		%	18.1		%
Other operating expense ratio	13.9		%	6.3		%	16.5		%	11.1		%	—		%	11.1		%
Combined ratio	102.8		%	119.7		%	(5.2)		%	97.3		%	—		%	97.3		%
Goodwill and intangible assets	$	224,525		$	140,800		$	441,330		$	806,655		$	—		$	806,655

(1)    Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)    Certain expenses have been excluded from ‘corporate expenses’ and reflected in ‘transaction costs and other.’

	Three Months Ended
	September 30, 2021
	Insurance			Reinsurance			Mortgage			Sub-Total			Other			Total
Gross premiums written (1)	$	1,596,619		$	1,251,760		$	360,934		$	3,207,415		$	—		$	3,207,415
Premiums ceded	(442,806)			(630,371)			(60,207)			(1,131,486)			—			(1,131,486)
Net premiums written	1,153,813			621,389			300,727			2,075,929			—			2,075,929
Change in unearned premiums	(215,143)			57,313			11,238			(146,592)			—			(146,592)
Net premiums earned	938,670			678,702			311,965			1,929,337			—			1,929,337
Other underwriting income (loss)	—			3,293			3,981			7,274			—			7,274
Losses and loss adjustment expenses	(668,630)			(545,846)			(11,543)			(1,226,019)			—			(1,226,019)
Acquisition expenses	(152,467)			(129,450)			(24,098)			(306,015)			—			(306,015)
Other operating expenses	(138,931)			(45,647)			(46,254)			(230,832)			—			(230,832)
Underwriting income (loss)	$	(21,358)		$	(38,948)		$	234,051		173,745			—			173,745
Net investment income										88,195			—			88,195
Net realized gains (losses)										(25,040)			—			(25,040)
Equity in net income (loss) of investment funds accounted for using the equity method										105,398			—			105,398
Other income (loss)										(3,960)			—			(3,960)
Corporate expenses (2)										(18,636)			—			(18,636)
Transaction costs and other (2)										(1,036)			—			(1,036)
Amortization of intangible assets										(20,135)			—			(20,135)
Interest expense										(33,176)			—			(33,176)
Net foreign exchange gains (losses)										36,078			—			36,078
Income (loss) before income taxes and income (loss) from operating affiliates										301,433			—			301,433
Income tax (expense) benefit										(4,137)			—			(4,137)
Income (loss) from operating affiliates										124,119			—			124,119
Net income (loss)										421,415			—			421,415
Amounts attributable to redeemable noncontrolling interests										(1,473)			—			(1,473)
Net income (loss) available to Arch										419,942			—			419,942
Preferred dividends										(16,090)			—			(16,090)
Loss on redemption of preferred shares										(15,101)			—			(15,101)
Net income (loss) available to Arch common shareholders										$	388,751		$	—		$	388,751
Underwriting Ratios
Loss ratio	71.2		%	80.4		%	3.7		%	63.5		%	—		%	63.5		%
Acquisition expense ratio	16.2		%	19.1		%	7.7		%	15.9		%	—		%	15.9		%
Other operating expense ratio	14.8		%	6.7		%	14.8		%	12.0		%	—		%	12.0		%
Combined ratio	102.2		%	106.2		%	26.2		%	91.4		%	—		%	91.4		%
Goodwill and intangible assets	$	261,103		$	176,128		$	526,091		$	963,322		$	—		$	963,322

(1)    Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)    Certain expenses have been excluded from ‘corporate expenses’ and reflected in ‘transaction costs and other.’

	Nine Months Ended
	September 30, 2022
	Insurance			Reinsurance			Mortgage			Sub-Total			Other			Total
Gross premiums written (1)	$	5,286,798		$	5,151,401		$	1,099,144		$	11,531,185		$	—		$	11,531,185
Premiums ceded	(1,482,886)			(1,770,807)			(241,097)			(3,488,632)			—			(3,488,632)
Net premiums written	3,803,912			3,380,594			858,047			8,042,553			—			8,042,553
Change in unearned premiums	(488,164)			(646,421)			9,190			(1,125,395)			—			(1,125,395)
Net premiums earned	3,315,748			2,734,173			867,237			6,917,158			—			6,917,158
Other underwriting income (loss)	—			5,814			6,130			11,944			—			11,944
Losses and loss adjustment expenses	(2,053,161)			(1,920,189)			187,163			(3,786,187)			—			(3,786,187)
Acquisition expenses	(641,807)			(569,915)			(27,343)			(1,239,065)			—			(1,239,065)
Other operating expenses	(493,412)			(198,606)			(150,064)			(842,082)			—			(842,082)
Underwriting income (loss)	$	127,368		$	51,277		$	883,123		$	1,061,768		$	—		$	1,061,768
Net investment income										315,468			—			315,468
Net realized gains (losses)										(742,666)			—			(742,666)
Equity in net income (loss) of investment funds accounted for using the equity method										75,505			—			75,505
Other income (loss)										(34,486)			—			(34,486)
Corporate expenses (2)										(76,928)			—			(76,928)
Transaction costs and other (2)										(734)			—			(734)
Amortization of intangible assets										(80,478)			—			(80,478)
Interest expense										(98,566)			—			(98,566)
Net foreign exchange gains (losses)										182,129			—			182,129
Income (loss) before income taxes and income (loss) from operating affiliates										601,012			—			601,012
Income tax (expense) benefit										(19,042)			—			(19,042)
Income (loss) from operating affiliates										37,665			—			37,665
Net income (loss)										619,635			—			619,635
Amounts attributable to redeemable noncontrolling interests										(2,390)			—			(2,390)
Net income (loss) available to Arch										617,245			—			617,245
Preferred dividends										(30,552)			—			(30,552)
Net income (loss) available to Arch common shareholders										$	586,693		$	—		$	586,693
Underwriting Ratios
Loss ratio	61.9		%	70.2		%	(21.6)		%	54.7		%	—		%	54.7		%
Acquisition expense ratio	19.4		%	20.8		%	3.2		%	17.9		%	—		%	17.9		%
Other operating expense ratio	14.9		%	7.3		%	17.3		%	12.2		%	—		%	12.2		%
Combined ratio	96.2		%	98.3		%	(1.1)		%	84.8		%	—		%	84.8		%

(1)    Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)    Certain expenses have been excluded from ‘corporate expenses’ and reflected in ‘transaction costs and other.’

	Nine Months Ended
	September 30, 2021
	Insurance			Reinsurance			Mortgage			Sub-Total			Other			Total
Gross premiums written (1)	$	4,381,372		$	4,080,840		$	1,143,691		$	9,602,213		$	457,465		$	9,890,912
Premiums ceded	(1,269,165)			(1,535,607)			(171,923)			(2,973,005)			(102,763)			(2,907,002)
Net premiums written	3,112,207			2,545,233			971,768			6,629,208			354,702			6,983,910
Change in unearned premiums	(488,636)			(484,607)			10,735			(962,508)			(22,734)			(985,242)
Net premiums earned	2,623,571			2,060,626			982,503			5,666,700			331,968			5,998,668
Other underwriting income (loss)	—			3,148			15,026			18,174			739			18,913
Losses and loss adjustment expenses	(1,750,257)			(1,494,539)			(85,112)			(3,329,908)			(259,042)			(3,588,950)
Acquisition expenses	(417,541)			(381,060)			(84,297)			(882,898)			(62,741)			(945,639)
Other operating expenses	(409,386)			(150,856)			(143,697)			(703,939)			(32,869)			(736,808)
Underwriting income (loss)	$	46,387		$	37,319		$	684,423		$	768,129		$	(21,945)		$	746,184
Net investment income										256,354			42,310			298,664
Net realized gains (losses)										239,690			80,638			320,328
Equity in net income (loss) of investment funds accounted for using the equity method										299,270			—			299,270
Other income (loss)										1,151			—			1,151
Corporate expenses (2)										(59,279)			—			(59,279)
Transaction costs and other (2)										(793)			(935)			(1,728)
Amortization of intangible assets										(48,925)			(898)			(49,823)
Interest expense										(98,812)			(8,410)			(107,222)
Net foreign exchange gains (losses)										39,691			(1,325)			38,366
Income (loss) before income taxes and income (loss) from operating affiliates										1,396,476			89,435			1,485,911
Income tax (expense) benefit										(93,942)			(234)			(94,176)
Income (loss) from operating affiliates										224,052			—			224,052
Net income (loss)										1,526,586			89,201			1,615,787
Amounts attributable to redeemable noncontrolling interests										(1,936)			(1,953)			(3,889)
Amounts attributable to nonredeemable noncontrolling interests										—			(78,314)			(78,314)
Net income (loss) available to Arch										1,524,650			8,934			1,533,584
Preferred dividends										(38,159)			—			(38,159)
Loss on redemption of preferred shares										(15,101)			—			(15,101)
Net income (loss) available to Arch common shareholders										$	1,471,390		$	8,934		$	1,480,324
Underwriting Ratios
Loss ratio	66.7		%	72.5		%	8.7		%	58.8		%	78.0		%	59.8		%
Acquisition expense ratio	15.9		%	18.5		%	8.6		%	15.6		%	18.9		%	15.8		%
Other operating expense ratio	15.6		%	7.3		%	14.6		%	12.4		%	9.9		%	12.3		%
Combined ratio	98.2		%	98.3		%	31.9		%	86.8		%	106.8		%	87.9		%

(1)    Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)    Certain expenses have been excluded from ‘corporate expenses’ and reflected in ‘transaction costs and other.’

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Reserve for Losses and Loss Adjustment Expenses

9 Months Ended

Sep. 30, 2022

Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]

Reserve for losses and loss adjustment expenses

The following table represents an analysis of losses and loss adjustment expenses and a reconciliation of the beginning and ending reserve for losses and loss adjustment expenses:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Reserve for losses and loss adjustment expenses at beginning of period	$	18,194,324	$	17,196,648	$	17,757,156	$	16,513,929
Unpaid losses and loss adjustment expenses recoverable	5,686,348		4,146,020		5,599,231		4,314,855
Net reserve for losses and loss adjustment expenses at beginning of period	12,507,976		13,050,628		12,157,925		12,199,074
Net incurred losses and loss adjustment expenses relating to losses occurring in:
Current year	1,863,519		1,348,528		4,280,048		3,812,381
Prior years	(180,823)		(122,509)		(493,861)		(223,431)
Total net incurred losses and loss adjustment expenses	1,682,696		1,226,019		3,786,187		3,588,950
Net losses and loss adjustment expense reserves of acquired business (1)	—		104,307		—		104,307
Retroactive reinsurance transactions (2)	—		—		—		(183,893)
Impact of deconsolidation of Somers (3)	—		(1,460,611)		—		(1,460,611)
Net foreign exchange (gains) losses and other	(243,387)		(78,152)		(524,682)		10,818
Net paid losses and loss adjustment expenses relating to losses occurring in:
Current year	(226,575)		(208,923)		(463,847)		(432,348)
Prior years	(538,967)		(417,368)		(1,773,840)		(1,610,397)
Total net paid losses and loss adjustment expenses	(765,542)		(626,291)		(2,237,687)		(2,042,745)
Net reserve for losses and loss adjustment expenses at end of period	13,181,743		12,215,900		13,181,743		12,215,900
Unpaid losses and loss adjustment expenses recoverable	6,106,548		5,115,147		6,106,548		5,115,147
Reserve for losses and loss adjustment expenses at end of period	$	19,288,291	$	17,331,047	$	19,288,291	$	17,331,047

(1)     Represents activity related to the Company’s acquisitions in the 2021 period of the Westpac Lenders Mortgage Insurance Limited and Somerset Bridge Group Limited, Southern Rock Holdings Limited and affiliates.

(2)     During the 2021 first quarter, the Company entered into a reinsurance to close and other related agreements with Premia Managing Agency Limited (“Premia”), in connection with the 2018 and prior years of account related to the acquisition of Barbican Group Holdings Limited (“Barbican”).

(3)    See note 11.

Development on Prior Year Loss Reserves

2022 Third Quarter

During the 2022 third quarter, the Company recorded net favorable development on prior year loss reserves of $180.8 million, which consisted of $5.4 million from the insurance segment, $49.2 million from the reinsurance segment and $126.2 million from the mortgage segment.

The insurance segment’s net favorable development of $5.4 million, or 0.5 loss ratio points, for the 2022 third quarter consisted of $15.9 million of net favorable development in short-tailed lines and $10.5 million of net adverse development in medium-tailed and long-tailed lines. Net favorable development in short-tailed lines reflected $8.9 million of favorable development in property (excluding marine), primarily from 2020 and 2021 accident years (i.e.,

the year in which a loss occurred) and $5.7 million of favorable development in lenders products, primarily from the 2021 accident year. Net adverse development in medium-tailed lines included $11.3 million of adverse development in professional liability business, primarily from the 2013 to 2016 and 2020 accident years, partially offset by favorable development in marine business of $5.9 million, across most accident years. Net adverse development in long-tailed lines reflected $12.3 million related to casualty business, primarily from the 2014 and 2020 accident years, partially offset by favorable development in construction, executive assurance and other lines of business.

The reinsurance segment’s net favorable development of $49.2 million, or 4.9 loss ratio points, for the 2022 third quarter consisted of $58.1 million of net favorable development in short-tailed and medium-tailed lines and

$8.9 million of net adverse development in long-tailed lines. Net favorable development in short-tailed lines reflected $35.8 million of favorable development related to property other than property catastrophe business, primarily from 2015 to 2021 underwriting years (i.e., all premiums and losses attributable to contracts having an inception or renewal date within the given twelve-month period) and $12.7 million of favorable development related to property catastrophe business, primarily from the 2014 to 2017 underwriting years. Net favorable development in medium-tailed lines included $7.9 million in marine and aviation lines, across most underwriting years. Net adverse development in long-tailed lines reflected $9.5 million related to casualty business, primarily from the 2014 to 2017 underwriting years.

The mortgage segment’s net favorable development was $126.2 million, or 44.7 loss ratio points, for the 2022 third quarter, with the largest contributor being reserve releases associated with the U.S. first lien portfolio from the 2020 and 2021 accident years. The Company’s credit risk transfer, international, second lien and student loan businesses also contributed to the favorable development.

2021 Third Quarter

During the 2021 third quarter, the Company recorded net favorable development on prior year loss reserves of $122.5 million, which consisted of $5.1 million from the insurance segment, $72.3 million from the reinsurance segment and $45.1 million from the mortgage segment.

The insurance segment’s net favorable development of $5.1 million, or 0.5 loss ratio points, for the 2021 third quarter consisted of $49.0 million of net favorable development in short-tailed and long-tailed lines and $43.9 million of net adverse development in medium-tailed lines. Net favorable development in short-tailed lines reflected $5.4 million of favorable development in lenders products, primarily from the 2020 accident year, $5.4 million of favorable development from property (excluding marine), primarily from the 2020 accident year, and $5.1 million of favorable development in travel and accident, across most accident years. Net favorable development in long-tailed lines reflected $26.3 million of favorable development related to construction and national accounts, across most accident years, and $6.7 million of favorable development related to other business, including alternative markets, primarily from the 2015 to 2018 accident years. Net adverse development in medium-tailed lines included $37.0 million of adverse development in contract binding business, across most accident years, partially offset by favorable development in marine and programs, primarily from more recent accident years.

The reinsurance segment’s net favorable development of $72.3 million, or 10.7 loss ratio points, for the 2021 third quarter consisted of $65.4 million of net favorable

development in short-tailed lines and $6.9 million in medium-tailed and long-tailed lines. Net favorable development in short-tailed lines reflected $46.1 million of favorable development related to property catastrophe and property other than property catastrophe business, primarily from the 2017 to 2020 underwriting years and $18.9 million of favorable development related to other specialty, primarily from the 2012 to 2017 underwriting years. Net favorable development in medium-tailed and long-tailed lines included $4.7 million of favorable development in casualty, primarily from the 2013 and 2014 underwriting years.

The mortgage segment’s net favorable development was $45.1 million, or 14.5 loss ratio points, for the 2021 third quarter, about half of which came from U.S. primary mortgage insurance, from better than expected cure activity in pre-pandemic delinquencies and recoveries on second lien and student loans, and the other half from our CRT portfolio and international mortgage insurance.

Nine Months Ended September 30, 2022

During the nine months ended September 30, 2022, the Company recorded net favorable development on prior year loss reserves of $493.9 million, which consisted of $19.4 million from the insurance segment, $128.1 million from the reinsurance segment and $346.4 million from the mortgage segment.

The insurance segment’s net favorable development of $19.4 million, or 0.6 loss ratio points, for the 2022 period consisted of $49.1 million of net favorable development in short-tailed and $29.7 million of net adverse development in medium and long-tailed lines. Net favorable development in short-tailed lines reflected $36.5 million of favorable development in lenders products, primarily from the 2021 accident year, and $14.3 million of favorable development related to travel and accident business, primarily from the 2019 to 2021 accident years. Net adverse development in medium-tailed lines included $24.9 million of adverse development in professional liability business, primarily from the 2013 to 2015 and 2018 to 2020 accident years, and $5.5 million of adverse development in contract binding business, across most accident years, partially offset by $11.4 million of favorable development in marine business, across most accident years. Net adverse development in long-tailed lines reflected $18.0 million of adverse development related to casualty business, primarily from the 2020 and 2021 accident years, partially offset by $17.4 million of favorable development in other business, including alternative markets and excess workers’ compensation, primarily from the 2019 and prior accident years.

The reinsurance segment’s net favorable development of $128.1 million, or 4.7 loss ratio points, for the 2022 period consisted of $147.8 million of net favorable development from short and medium-tailed lines, partially offset by

$19.7 million of net adverse development from long-tailed lines. Net favorable development in short-tailed lines reflected $83.2 million of favorable development from property other than property catastrophe business, primarily from the 2015 to 2021 underwriting years, $22.4 million of favorable development from property catastrophe, primarily from the 2018 to 2020 underwriting years, and $19.8 million from other specialty business, primarily from the 2021 underwriting year. Net favorable development in medium-tailed lines included $22.7 million in marine and aviation lines, across most underwriting years. Net adverse development in long-tailed lines primarily reflected $19.3 million in casualty reserves, primarily from the 2021 underwriting year.

The mortgage segment’s net favorable development was $346.4 million, or 39.9 loss ratio points, for the 2022 period, with the largest contributor being reserve releases associated with the U.S. first lien portfolio from the 2020 and 2021 accident years. The Company’s credit risk transfer, international, second lien and student loan businesses also contributed to the favorable development.

Nine Months Ended September 30, 2021

During the nine months ended September 30, 2021, the Company recorded net favorable development on prior year loss reserves of $223.4 million, which consisted of $13.1 million from the insurance segment, $119.6 million from the reinsurance segment, $99.1 million from the mortgage segment, partially offset by $8.4 million of adverse development from the ‘other’ segment (activity for the six months ended June 30, 2021 prior to deconsolidation of Somers).

The insurance segment’s net favorable development of $13.1 million, or 0.5 loss ratio points, for the 2021 period consisted of $102.5 million of net favorable development in short-tailed and long-tailed lines, partially offset by $89.4 million of net adverse development in medium-tailed lines. Net favorable development of $65.3 million in short-tailed lines reflected $27.0 million of favorable development from property (excluding marine), primarily from the 2019 and 2020 accident years, $24.0 million of favorable development in lenders products, primarily from the 2020 accident year, and $14.4 million of favorable development in travel and accident, primarily from the 2017 to 2020 accident years. Net favorable development of $37.1 million in long-tailed lines included favorable development primarily related to construction, national accounts and alternative markets, primarily from the 2016 to 2019 accident years. Net adverse development in medium-tailed lines reflected $57.1 million of adverse development in contract binding business, primarily from the 2014 to 2019 accident years, $26.2 million of adverse development in professional liability business, primarily from the 2019 and 2020 accident years, and

$6.9 million of adverse development in programs business, primarily from the 2019 accident year.

The reinsurance segment’s net favorable development of $119.6 million, or 5.8 loss ratio points, for the 2021 period consisted of $139.7 million of net favorable development from short-tailed and medium-tailed lines, partially offset by $20.1 million of net adverse development from long-tailed lines. Net favorable development of $132.6 million in short-tailed lines reflected $97.1 million of favorable development from other specialty lines, primarily from the 2016 to 2019 underwriting years, and $71.7 million of favorable development from property other than property catastrophe business, primarily from the 2017 to 2020 underwriting years. Such amounts were partially offset by adverse development of $36.3 million from property catastrophe, primarily from the 2020 underwriting year. Adverse development in long-tailed lines reflected an increase in reserves from casualty, primarily from the 2018 underwriting year.

The mortgage segment’s net favorable development was $99.1 million, or 10.1 loss ratio points, for the 2021 period, which included reserve releases associated with various vintage credit risk transfer contracts that were called by the GSEs, favorable development on U.S. and international business and subrogation recoveries on second lien and student loan business.

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Allowance for Expected Credit Losses

9 Months Ended

Sep. 30, 2022

Credit Loss [Abstract]

Allowance for expected credit losses

Premiums Receivable

The following table provides a roll forward of the allowance for expected credit losses of the Company’s premium receivables:

	Premium Receivables, Net of Allowance		Allowance for Expected Credit Losses
Three Months Ended September 30, 2022
Balance at beginning of period	$	3,634,182	$	38,170
Change for provision of expected credit losses (1)			59
Balance at end of period	$	3,579,380	$	38,229
Three Months Ended September 30, 2021
Balance at beginning of period	$	2,866,578	$	35,979
Change for provision of expected credit losses (1)			2,736
Balance at end of period	$	2,807,720	$	38,715
Nine Months Ended September 30, 2022
Balance at beginning of period	$	2,633,280	$	39,958
Change for provision of expected credit losses (1)			(1,729)
Balance at end of period	$	3,579,380	$	38,229
Nine Months Ended September 30, 2021
Balance at beginning of period	$	2,064,586	$	37,781
Change for provision of expected credit losses (1)			934
Balance at end of period	$	2,807,720	$	38,715

(1)Amounts deemed uncollectible are written-off in operating expenses. For the 2022 third quarter and 2021 third quarter, amounts written off were $1.9 million and $1.2 million, respectively. For the nine months ended September 30, 2022 and 2021 period, amounts written off were $6.6 million and $2.4 million, respectively.

Reinsurance Recoverables

The following table provides a roll forward of the allowance for expected credit losses of the Company’s reinsurance recoverables:

	Reinsurance Recoverables, Net of Allowance		Allowance for Expected Credit Losses
Three Months Ended September 30, 2022
Balance at beginning of period	$	5,938,511	$	14,740
Change for provision of expected credit losses			2,626
Balance at end of period	$	6,356,456	$	17,366
Three Months Ended September 30, 2021
Balance at beginning of period	$	4,314,515	$	11,029
Change for provision of expected credit losses			1,802
Balance at end of period	$	5,358,852	$	12,831
Nine Months Ended September 30, 2022
Balance at beginning of period	$	5,880,735	$	13,230
Change for provision of expected credit losses			4,136
Balance at end of period	$	6,356,456	$	17,366
Nine Months Ended September 30, 2021
Balance at beginning of period	$	4,500,802	$	11,636
Change for provision of expected credit losses			1,195
Balance at end of period	$	5,358,852	$	12,831

The following table summarizes the Company’s reinsurance recoverables on paid and unpaid losses (not including ceded unearned premiums):

	September 30,			December 31
	2022			2021
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses	$	6,356,456		$	5,880,735
% due from carriers with A.M. Best rating of “A-” or better	69.5		%	69.7		%
% due from all other rated carriers	0.1		%	0.1		%
% due from all other carriers with no A.M. Best rating (1)	30.4		%	30.2		%
Largest balance due from any one carrier as % of total shareholders’ equity	9.1		%	6.7		%

(1)    At September 30, 2022 and December 31, 2021 over 95% and 91% of such amount were collateralized through reinsurance trusts, funds withheld arrangements, letters of credit or other, respectively.

Contractholder Receivables

The following table provides a roll forward of the allowance for expected credit losses of the Company’s contractholder receivables:

	Contract-holder Receivables, Net of Allowance		Allowance for Expected Credit Losses
Three Months Ended September 30, 2022
Balance at beginning of period	$	1,758,018	$	3,005
Change for provision of expected credit losses			(645)
Balance at end of period	$	1,735,730	$	2,360
Three Months Ended September 30, 2021
Balance at beginning of period	$	1,882,948	$	4,471
Change for provision of expected credit losses			(987)
Balance at end of period	1,824,990		$	3,484
Nine Months Ended September 30, 2022
Balance at beginning of period	$	1,828,691	$	3,437
Change for provision of expected credit losses			(1,077)
Balance at end of period	$	1,735,730	$	2,360
Nine Months Ended September 30, 2021
Balance at beginning of period	$	1,986,924	$	8,638
Change for provision of expected credit losses			(5,154)
Balance at end of period	1,824,990		$	3,484

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Investment Information

9 Months Ended

Sep. 30, 2022

Disclosure Investment Information [Abstract]

Investment Information

Available For Sale Investments

The following table summarizes the fair value and cost or amortized cost of the Company’s securities classified as available for sale:

	Estimated Fair Value		Gross Unrealized Gains		Gross Unrealized Losses		Allowance for Expected Credit Losses		Cost or Amortized Cost
September 30, 2022
Fixed maturities:
Corporate bonds	$	7,096,269	$	51,777	$	(895,365)	$	(35,657)	$	7,975,514
Residential mortgage backed securities	763,371		7,561		(84,183)		2		839,991
Municipal bonds	407,724		5,437		(37,692)		(99)		440,078
Commercial mortgage backed securities	1,064,238		3,079		(50,010)		(1,583)		1,112,752
U.S. government and government agencies	5,126,407		36,074		(400,784)		—		5,491,117
Non-U.S. government securities	2,073,170		9,315		(287,583)		(1,720)		2,353,158
Asset backed securities	1,589,548		1,076		(105,037)		(6,936)		1,700,445
Total	18,120,727		114,319		(1,860,654)		(45,993)		19,913,055
Short-term investments	1,940,857		1,419		(1,633)		—		1,941,071
Total	$	20,061,584	$	115,738	$	(1,862,287)	$	(45,993)	$	21,854,126
December 31, 2021
Fixed maturities:
Corporate bonds	$	6,553,333	$	104,170	$	(69,194)	$	(2,037)	$	6,520,394
Residential mortgage backed securities	408,477		2,825		(5,410)		(48)		411,110
Municipal bonds	404,666		18,724		(1,409)		(2)		387,353
Commercial mortgage backed securities	1,046,484		1,740		(3,117)		(6)		1,047,867
U.S. government and government agencies	4,772,764		10,076		(45,967)		—		4,808,655
Non-U.S. government securities	2,120,294		54,048		(34,749)		(82)		2,101,077
Asset backed securities	2,692,091		6,540		(11,108)		(708)		2,697,367
Total	17,998,109		198,123		(170,954)		(2,883)		17,973,823
Short-term investments	1,734,716		568		(590)		—		1,734,738
Total	$	19,732,825	$	198,691	$	(171,544)	$	(2,883)	$	19,708,561

The following table summarizes, for all available for sale securities in an unrealized loss position, the fair value and gross unrealized loss by length of time the security has been in a continual unrealized loss position:

	Less than 12 Months				12 Months or More				Total
	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
September 30, 2022
Fixed maturities:
Corporate bonds	$	5,596,229	$	(625,774)	$	1,470,800	$	(269,591)	$	7,067,029	$	(895,365)
Residential mortgage backed securities	620,572		(63,732)		93,902		(20,451)		714,474		(84,183)
Municipal bonds	373,219		(36,039)		9,399		(1,653)		382,618		(37,692)
Commercial mortgage backed securities	995,680		(49,215)		34,445		(795)		1,030,125		(50,010)
U.S. government and government agencies	4,205,475		(303,805)		715,347		(96,979)		4,920,822		(400,784)
Non-U.S. government securities	1,728,965		(221,540)		301,298		(66,043)		2,030,263		(287,583)
Asset backed securities	1,193,405		(74,885)		310,838		(30,152)		1,504,243		(105,037)
Total	14,713,545		(1,374,990)		2,936,029		(485,664)		17,649,574		(1,860,654)
Short-term investments	227,201		(1,633)		—		—		227,201		(1,633)
Total	$	14,940,746	$	(1,376,623)	$	2,936,029	$	(485,664)	$	17,876,775	$	(1,862,287)
December 31, 2021
Fixed maturities:
Corporate bonds	$	3,639,582	$	(63,938)	$	98,867	$	(5,256)	$	3,738,449	$	(69,194)
Residential mortgage backed securities	222,176		(3,545)		46,809		(1,865)		268,985		(5,410)
Municipal bonds	26,665		(385)		16,361		(1,024)		43,026		(1,409)
Commercial mortgage backed securities	675,603		(2,805)		5,908		(312)		681,511		(3,117)
U.S. government and government agencies	4,211,621		(44,180)		33,373		(1,787)		4,244,994		(45,967)
Non-U.S. government securities	1,511,301		(31,983)		62,957		(2,766)		1,574,258		(34,749)
Asset backed securities	1,667,002		(9,853)		33,082		(1,255)		1,700,084		(11,108)
Total	11,953,950		(156,689)		297,357		(14,265)		12,251,307		(170,954)
Short-term investments	284,733		(590)		—		—		284,733		(590)
Total	$	12,238,683	$	(157,279)	$	297,357	$	(14,265)	$	12,536,040	$	(171,544)

At September 30, 2022, on a lot level basis, approximately 9,590 security lots out of a total of approximately 11,500 security lots were in an unrealized loss position and the largest single unrealized loss from a single lot in the Company’s fixed maturity portfolio was $7.2 million. At December 31, 2021, on a lot level basis, approximately 4,700 security lots out of a total of approximately 10,240 security lots were in an unrealized loss position and the largest single unrealized loss from a single lot in the Company’s fixed maturity portfolio was $1.1 million.

The contractual maturities of the Company’s fixed maturities are shown in the following table. Expected maturities, which are management’s best estimates, will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	September 30, 2022				December 31, 2021
Maturity	Estimated Fair Value		Amortized Cost		Estimated Fair Value		Amortized Cost
Due in one year or less	$	579,231	$	599,970	$	300,889	$	299,772
Due after one year through five years	10,029,151		10,808,495		8,355,255		8,339,387
Due after five years through 10 years	3,856,180		4,495,113		4,689,155		4,684,393
Due after 10 years	239,008		356,289		505,758		493,927
	14,703,570		16,259,867		13,851,057		13,817,479
Residential mortgage backed securities	763,371		839,991		408,477		411,110
Commercial mortgage backed securities	1,064,238		1,112,752		1,046,484		1,047,867
Asset backed securities	1,589,548		1,700,445		2,692,091		2,697,367
Total	$	18,120,727	$	19,913,055	$	17,998,109	$	17,973,823

Equity Securities, at Fair Value

At September 30, 2022, the Company held $0.8 billion of equity securities, at fair value, compared to $1.8 billion at December 31, 2021. Such holdings include publicly traded common stocks primarily in the consumer cyclical and non-cyclical, technology, communication and financial sectors and exchange-traded funds in fixed income, equity and other sectors.

Other Investments, at Fair Value

The following table summarizes the Company’s other investments and other investable assets:

	September 30, 2022		December 31, 2021
Fixed maturities	$	530,303	$	416,698
Other investments	1,005,929		1,432,553
Short-term investments	28,614		97,806
Equity securities	13,905		26,493
Total	$	1,578,751	$	1,973,550

The following table summarizes the Company’s other investments, as detailed in the previous table, by strategy:

	September 30, 2022		December 31, 2021
Lending	$	398,789	$	536,345
Investment grade fixed income	229,262		147,810
Term loan investments	151,649		484,950
Private equity	117,856		91,126
Energy	55,250		81,692
Credit related funds	53,123		70,278
Infrastructure	—		20,352
Total	$	1,005,929	$	1,432,553

Investments Accounted For Using the Equity Method

The following table summarizes the Company’s investments accounted for using the equity method, by strategy:

	September 30, 2022		December 31, 2021
Credit related funds	$	1,135,623	$	1,022,334
Private equity	761,997		436,042
Real estate	474,666		396,395
Lending	454,196		376,649
Equities	261,650		395,090
Infrastructure	236,920		230,070
Energy	113,778		119,141
Fixed income	127,116		101,890
Total	$	3,565,946	$	3,077,611

Certain of the Company’s other investments are in investment funds for which the Company has the option to redeem at agreed upon values as described in each investment fund’s subscription agreement. Depending on the terms of the various subscription agreements, investments in investment funds may be redeemed daily, monthly, quarterly or on other terms. Two common redemption restrictions which may impact the Company’s ability to redeem these investment funds are gates and lockups. A gate is a suspension of redemptions which may be implemented by the general partner or investment manager of the fund in order to defer, in whole or in part, the redemption request in the event the aggregate amount of redemption requests exceeds a predetermined percentage of the investment fund’s net assets which may otherwise hinder the general partner or investment manager’s ability to liquidate holdings in an orderly fashion in order to generate the cash necessary to fund extraordinarily large redemption payouts. A lockup period is the initial amount of time an investor is contractually required to hold the security before having the ability to redeem. If the investment funds are eligible to be

redeemed, the time to redeem such fund can take weeks or months following the notification.

Limited Partnership Interests

In the normal course of its activities, the Company invests in limited partnerships as part of its overall investment strategy. Such amounts are included in ‘investments accounted for using the equity method’ and ‘investments accounted for using the fair value option.’ The Company has determined that it is not required to consolidate these investments because it is not the primary beneficiary of the funds. The Company’s maximum exposure to loss with respect to these investments is limited to the investment carrying amounts reported in the Company’s consolidated balance sheet and any unfunded commitment.

The following table summarizes investments in limited partnership interests where the Company has a variable interest by balance sheet line item:

	September 30, 2022		December 31, 2021
Investments accounted for using the equity method (1)	$	3,565,946	$	3,077,611
Investments accounted for using the fair value option (2)	120,498		170,595
Total	$	3,686,444	$	3,248,206

(1)    Aggregate unfunded commitments were $2.8 billion at September 30, 2022, compared to $2.6 billion at December 31, 2021.

(2)    Aggregate unfunded commitments were $21.5 million at September 30, 2022, compared to $18.8 million at December 31, 2021.

Net Investment Income

The components of net investment income were derived from the following sources:

	September 30,
	2022		2021
Three Months Ended
Fixed maturities	$	123,568	$	75,964
Term loans	88		1,736
Equity securities	4,261		9,867
Short-term investments	9,304		1,858
Other (1)	8,556		17,378
Gross investment income	145,777		106,803
Investment expenses	(17,137)		(18,608)
Net investment income	$	128,640	$	88,195
Nine Months Ended
Fixed maturities	$	310,963	$	255,215
Term loans	2,106		33,343
Equity securities	16,620		24,101
Short-term investments	15,999		3,603
Other (1)	26,598		51,683
Gross investment income	372,286		367,945
Investment expenses	(56,818)		(69,281)
Net investment income	$	315,468	$	298,664

(1)    Includes income distributions from investment funds and other items.

Net Realized Gains (Losses)

Net realized gains (losses), which include changes in the allowance for credit losses on financial assets and net impairment losses recognized in earnings were as follows:

	September 30,
	2022		2021
Three Months Ended
Available for sale securities:
Gross gains on investment sales	$	18,030	$	86,819
Gross losses on investment sales	(73,970)		(18,446)
Change in fair value of assets and liabilities accounted for using the fair value option:
Fixed maturities	(19,304)		(7,492)
Other investments	(17,882)		3,811
Equity securities	(584)		3,042
Short-term investments	(975)		16
Equity securities, at fair value:
Net realized gains (losses) on sales during the period	(6,401)		14,736
Net unrealized gains (losses) on equity securities still held at reporting date	(36,162)		(40,155)
Allowance for credit losses:
Investments related	8,652		(456)
Underwriting related	(4,232)		(3,985)
Derivative instruments (1)	(48,196)		(21,435)
Other	(2,649)		(41,495)
Net realized gains (losses)	$	(183,673)	$	(25,040)
Nine Months Ended
Available for sale securities:
Gross gains on investment sales	$	52,923	$	267,362
Gross losses on investment sales	(239,493)		(132,071)
Change in fair value of assets and liabilities accounted for using the fair value option:
Fixed maturities	(89,148)		19,973
Other investments	(35,203)		111,550
Equity securities	(6,021)		10,599
Short-term investments	(3,132)		648
Equity securities, at fair value:
Net realized gains (losses) on sales during the period	75,689		86,155
Net unrealized gains (losses) on equity securities still held at reporting date	(318,732)		45,400
Allowance for credit losses:
Investments related	(48,096)		(1,208)
Underwriting related	(7,676)		2,664
Derivative instruments (1)	(117,591)		(36,428)
Other	(6,186)		(54,316)
Net realized gains (losses)	$	(742,666)	$	320,328

(1)    See note 9 for information on the Company’s derivative instruments.

Equity in Net Income (Loss) of Investment Funds Accounted for Using the Equity Method

The Company recorded a loss of $18.9 million related to investment funds accounted for using the equity method in the 2022 third quarter, compared to income of $105.4 million for the 2021 third quarter and an income of $75.5 million for the nine months ended September 30, 2022, compared to income of $299.3 million for nine months ended September 30, 2021. In applying the equity method, investments are initially recorded at cost and are subsequently adjusted based on the Company’s proportionate share of the net income or loss of the funds (which include changes in the market value of the underlying securities in the funds). Such investments are generally recorded on a one to three month lag based on the availability of reports from the investment funds.

Investments in Operating Affiliates

Investments in which the Company has significant influence over the operating and financial policies are classified as ‘investments in operating affiliates’ on the Company’s balance sheets and are accounted for under the equity method. Such investments primarily include the Company’s investment in Coface SA (“Coface”), Greysbridge and Premia. Investments in Coface and Premia are generally recorded on a three month lag, while the Company’s investment in Greysbridge is not recorded on a lag.

In 2021, the Company completed the share purchase agreement with Natixis to purchase 29.5% of the common equity of Coface, a France-based leader in the global trade credit insurance market. The consideration paid was €9.95 per share, or an aggregate €453 million (approximately

$546 million) including related fees. Income (loss) from operating affiliates reflected a one-time gain of $74.5 million realized from the acquisition. As of September 30, 2022, the Company owned approximately 29.86% of the issued shares of Coface, or 30.05% excluding treasury shares, with a carrying value of $506.7 million, compared to $630.5 million at December 31, 2021.

In July 2021, the Company announced the completion of the previously disclosed acquisition of Somers by Greysbridge for a cash purchase price of $35.00 per common share.

Effective July 1, 2021, Somers is wholly owned by Greysbridge, and Greysbridge is owned 40% by the Company, 30% by certain investment funds managed by Kelso and 30% by certain investment funds managed by Warburg. At September 30, 2022 the Company’s carrying value in Greysbridge was $277.6 million, compared to $375.7 million at December 31, 2021, which reflected the Company’s aggregate purchase price of $278.9 million along with income (loss) from operating affiliates, which included a one-time gain of $95.7 million recognized from the acquisition.

Income from operating affiliates for the 2022 third quarter was income of $8.5 million, compared to an income of $124.1 million, for the 2021 third quarter and income of $37.7 million for the nine months ended September 30, 2022, compared to income of $224.1 million for nine months ended September 30, 2021.

Allowance for Expected Credit Losses

The following table provides a roll forward of the allowance for expected credit losses of the Company’s securities classified as available for sale:

	Structured Securities (1)		Municipal Bonds		Corporate Bonds		Total
Three Months Ended September 30, 2022
Balance at beginning of period	$	18,283	$	298	$	39,829	$	58,410
Additions for current-period provision for expected credit losses	1,782		12		1,986		3,780
Additions (reductions) for previously recognized expected credit losses	(9,767)		(211)		(2,552)		(12,530)
Reductions due to disposals	(1,780)		—		(1,887)		(3,667)
Balance at end of period	$	8,518	$	99	$	37,376	$	45,993
Three Months Ended September 30, 2021
Balance at beginning of period	$	759	$	6	$	1,359	$	2,124
Additions for current-period provision for expected credit losses	48		—		—		48
Additions (reductions) for previously recognized expected credit losses	14		(4)		395		405
Reductions due to disposals	(234)		—		(232)		(466)
Balance at end of period	$	587	$	2	$	1,522	$	2,111
Nine Months Ended September 30, 2022
Balance at beginning of period	$	802	$	2	$	2,079	$	2,883
Additions for current-period provision for expected credit losses	12,560		359		40,602		53,521
Additions (reductions) for previously recognized expected credit losses	(2,575)		(262)		(2,772)		(5,609)
Reductions due to disposals	(2,269)		—		(2,533)		(4,802)
Balance at end of period	$	8,518	$	99	$	37,376	$	45,993
Nine Months Ended September 30, 2021
Balance at beginning of period	$	1,490	$	11	$	896	$	2,397
Additions for current-period provision for expected credit losses	282		—		2,428		2,710
Additions (reductions) for previously recognized expected credit losses	(751)		(9)		(557)		(1,317)
Reductions due to disposals	(434)		—		(1,245)		(1,679)
Balance at end of period	$	587	$	2	$	1,522	$	2,111

(1)    Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.

Restricted Assets

The Company is required to maintain assets on deposit, which primarily consist of fixed maturities, with various regulatory authorities to support its underwriting operations. The Company’s subsidiaries maintain assets in trust accounts as collateral for transactions with affiliated companies and also have investments in segregated portfolios primarily to provide collateral or guarantees for letters of credit to third parties. See note 18, “Commitments and Contingencies,” of the notes to consolidated financial statements in the Company’s 2021 Form 10-K.

The following table details the value of the Company’s restricted assets:

	September 30, 2022		December 31, 2021
Assets used for collateral or guarantees:
Affiliated transactions	$	4,212,521	$	4,223,955
Third party agreements	2,847,814		2,721,160
Deposits with U.S. regulatory authorities	756,368		798,100
Deposits with non-U.S. regulatory authorities	519,254		506,517
Total restricted assets	$	8,335,957	$	8,249,732

Reconciliation of Cash and Restricted Cash

The following table details reconciliation of cash and restricted cash within the Consolidated Balance Sheets:

	September 30, 2022		December 31, 2021
Cash	$	813,583	$	858,668
Restricted cash (included in ‘other assets’)	444,741		456,103
Cash and restricted cash	$	1,258,324	$	1,314,771

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Fair Value

9 Months Ended

Sep. 30, 2022

Fair Value Disclosures [Abstract]

Fair Value

Accounting guidance regarding fair value measurements addresses how companies should measure fair value when they are required to use a fair value measure for recognition or disclosure purposes under GAAP and provides a common definition of fair value to be used throughout GAAP. It defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly fashion between market participants at the measurement date. In addition, it establishes a three-level valuation hierarchy for the disclosure of fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The level in the hierarchy within which a given fair value measurement falls is determined based on the lowest level input that is significant to the measurement (Level 1 being the highest priority and Level 3 being the lowest priority).

The levels in the hierarchy are defined as follows:

Level 1:	Inputs to the valuation methodology are observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets
Level 2:	Inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument
Level 3:	Inputs to the valuation methodology are unobservable and significant to the fair value measurement

Following is a description of the valuation methodologies used for securities measured at fair value, as well as the general classification of such securities pursuant to the valuation hierarchy. The Company reviews its securities measured at fair value and discusses the proper classification of such investments with investment advisers and others.

The Company determines the existence of an active market based on its judgment as to whether transactions for the financial instrument occur in such market with sufficient frequency and volume to provide reliable pricing information. The independent pricing sources obtain market quotations and actual transaction prices for securities that have quoted prices in active markets. The Company uses quoted values and other data provided by nationally recognized independent pricing sources as inputs into its process for determining fair values of its fixed maturity investments. To validate the techniques or models used by pricing sources, the Company's review process includes, but is not limited to: (i) quantitative analysis (e.g., comparing the quarterly return for each managed portfolio to its target benchmark, with significant differences identified and investigated); (ii) a review of the average number of prices obtained in the pricing process and the range of resulting fair values; (iii) initial and ongoing evaluation of methodologies used by outside parties to calculate fair value; (iv) a comparison of the fair value estimates to the Company’s knowledge of the current market; (v) a comparison of the pricing services' fair values to other pricing services' fair values for the same investments; and (vi) periodic back-testing, which includes randomly selecting purchased or sold securities and comparing the executed prices to the fair value estimates from the pricing service. A price source hierarchy was maintained in order to determine which price source would be used (i.e., a price obtained from a pricing service with more seniority in the hierarchy will be used over a less senior one in all cases). The hierarchy prioritizes pricing services based on availability and reliability and assigns the highest priority to index providers. Based on the above

review, the Company will challenge any prices for a security or portfolio which are considered not to be representative of fair value. The Company did not adjust any of the prices obtained from the independent pricing sources at September 30, 2022.

In certain circumstances, when fair values are unavailable from these independent pricing sources, quotes are obtained directly from broker-dealers who are active in the corresponding markets. Such quotes are subject to the validation procedures noted above. Where quotes are unavailable, fair value is determined by the Investment Manager using quantitative and qualitative assessments such as internally modeled values. Of the $22.8 billion of financial assets and liabilities measured at fair value at September 30, 2022, approximately $12.6 million, or 0.1%, were priced using non-binding broker-dealer quotes or modeled valuations. Of the $23.8 billion of financial assets and liabilities measured at fair value at December 31, 2021, approximately $7.7 million, or 0.0%, were priced using non-binding broker-dealer quotes or modeled valuations.

Fixed maturities

The Company uses the market approach valuation technique to estimate the fair value of its fixed maturity securities, when possible. The market approach includes obtaining prices from independent pricing services, such as index providers and pricing vendors, as well as to a lesser extent quotes from broker-dealers. The independent pricing sources obtain market quotations and actual transaction prices for securities that have quoted prices in active markets. Each source has its own proprietary method for determining the fair value of securities that are not actively traded. In general, these methods involve the use of “matrix pricing” in which the independent pricing source uses observable market inputs including, but not limited to, investment yields, credit risks and spreads, benchmarking of like securities, broker-dealer quotes, reported trades and sector groupings to determine a reasonable fair value.

The following describes the significant inputs generally used to determine the fair value of the Company’s fixed maturity securities by asset class:

U.S. government and government agencies – valuations provided by independent pricing services, with all prices provided through index providers and pricing vendors. The Company determined that all U.S. Treasuries would be classified as Level 1 securities due to observed levels of trading activity, the high number of strongly correlated pricing quotes received on U.S. Treasuries and other factors. The fair values of U.S. government agency securities are generally determined using the spread above the risk-free yield curve. As the yields for the risk-free yield curve and the spreads for these securities are observable market inputs, the

fair values of U.S. government agency securities are classified within Level 2.

Corporate bonds – valuations provided by independent pricing services, substantially all through index providers and pricing vendors with a small amount through broker-dealers. The fair values of these securities are generally determined using the spread above the risk-free yield curve. These spreads are generally obtained from the new issue market, secondary trading and from broker-dealers who trade in the relevant security market. As the significant inputs used in the pricing process for corporate bonds are observable market inputs, the fair value of these securities are classified within Level 2. A small number of securities are included in Level 3 due to a low level of transparency on the inputs used in the pricing process.

Municipal bonds – valuations provided by independent pricing services, with all prices provided through index providers and pricing vendors. The fair values of these securities are generally determined using spreads obtained from broker-dealers who trade in the relevant security market, trade prices and the new issue market. As the significant inputs used in the pricing process for municipal bonds are observable market inputs, the fair value of these securities are classified within Level 2.

Residential mortgage-backed securities – valuations provided by independent pricing services, substantially all through pricing vendors and index providers with a small amount through broker-dealers. The fair values of these securities are generally determined through the use of pricing models (including Option Adjusted Spread) which use spreads to determine the expected average life of the securities. These spreads are generally obtained from the new issue market, secondary trading and from broker-dealers who trade in the relevant security market. The pricing services also review prepayment speeds and other indicators, when applicable. As the significant inputs used in the pricing process for mortgage-backed securities are observable market inputs, the fair value of these securities are classified within Level 2. A small number of securities are included in Level 3 due to a low level of transparency on the inputs used in the pricing process.

Commercial mortgage-backed securities – valuations provided by independent pricing services, substantially all through index providers and pricing vendors with a small amount through broker-dealers. The fair values of these securities are generally determined through the use of pricing models which use spreads to determine the appropriate average life of the securities. These spreads are generally obtained from the new issue market, secondary trading and from broker-dealers who trade in the relevant security market. The pricing services also review prepayment speeds and other indicators, when applicable. As the significant inputs used in the pricing process for commercial mortgage-

backed securities are observable market inputs, the fair value of these securities are classified within Level 2.

Non-U.S. government securities – valuations provided by independent pricing services, with all prices provided through index providers and pricing vendors. The fair values of these securities are generally based on international indices or valuation models which include daily observed yield curves, cross-currency basis index spreads and country credit spreads. As the significant inputs used in the pricing process for non-U.S. government securities are observable market inputs, the fair value of these securities are classified within Level 2.

Asset-backed securities – valuations provided by independent pricing services, substantially all through index providers and pricing vendors with a small amount through broker-dealers. The fair values of these securities are generally determined through the use of pricing models (including Option Adjusted Spread) which use spreads to determine the appropriate average life of the securities. These spreads are generally obtained from the new issue market, secondary trading and from broker-dealers who trade in the relevant security market. The pricing services also review prepayment speeds and other indicators, when applicable. As the significant inputs used in the pricing process for asset-backed securities are observable market inputs, the fair value of these securities are classified within Level 2. A small number of securities are included in Level 3 due to a low level of transparency on the inputs used in the pricing process.

Equity securities

The Company determined that exchange-traded equity securities would be included in Level 1 as their fair values are based on quoted market prices in active markets. Certain equity securities are included in Level 2 of the valuation hierarchy as the significant inputs used in the pricing process for such securities are observable market inputs. Other equity securities are included in Level 3 due to the lack of an available independent price source for such securities. As the significant inputs used to price these securities are unobservable, the fair value of such securities are classified as Level 3.

Other investments

The Company’s other investments include term loan investments for which fair values are estimated by using quoted prices of term loan investments with similar characteristics, pricing models or matrix pricing. Such investments are generally classified within Level 2. The fair values for certain of the Company’s other investments are determined using net asset values as advised by external fund managers. The net asset value is based on the fund manager’s valuation of the underlying holdings in accordance with the fund’s governing documents. In accordance with applicable accounting guidance, certain investments that are measured at

fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. A small number of securities are included in Level 3 due to the lack of an available independent price source for such securities.

Derivative instruments

The Company’s futures contracts, foreign currency forward contracts, interest rate swaps and other derivatives trade in the over-the-counter derivative market. The Company uses the market approach valuation technique to estimate the fair value for these derivatives based on significant observable market inputs from third party pricing vendors, non-binding broker-dealer quotes and/or recent trading activity. As the significant inputs used in the pricing process for these derivative instruments are observable market inputs, the fair value of these securities are classified within Level 2.

Short-term investments

The Company determined that certain of its short-term investments held in highly liquid money market-type funds, Treasury bills and commercial paper would be included in Level 1 as their fair values are based on quoted market prices in active markets. The fair values of other short-term investments are generally determined using the spread above the risk-free yield curve and are classified within Level 2.

Residential mortgage loans

The Company’s residential mortgage loans (included in ‘other assets’ in the consolidated balance sheets) include amounts related to the Company’s whole mortgage loan purchase and sell program. Fair values of residential mortgage loans are generally determined based on market prices. As significant inputs used in pricing process for these residential mortgage loans are observable market inputs, the fair value of these securities are classified within Level 2.

Other liabilities

The Company’s other liabilities include contingent and deferred consideration liabilities related to the Company’s acquisitions. Contingent consideration liabilities are remeasured at fair value at each balance sheet date with changes in fair value recognized in ‘net realized gains (losses).’ To determine the fair value of contingent consideration liabilities, the Company estimates the future payments using an income approach based on modeled inputs which include a weighted average cost of capital. Deferred consideration liabilities are measured at fair value on the transaction date. The Company determined that contingent and deferred consideration liabilities would be included within Level 3.

The following table presents the Company’s financial assets and liabilities measured at fair value by level at September 30, 2022:

			Estimated Fair Value Measurements Using:
	Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets measured at fair value:
Available for sale securities:
Fixed maturities:
Corporate bonds	$	7,096,269	$	—	$	7,096,256	$	13
Residential mortgage backed securities	763,371		—		763,371		—
Municipal bonds	407,724		—		407,724		—
Commercial mortgage backed securities	1,064,238		—		1,064,238		—
U.S. government and government agencies	5,126,407		5,100,908		25,499		—
Non-U.S. government securities	2,073,170		—		2,073,170		—
Asset backed securities	1,589,548		—		1,589,548		—
Total	18,120,727		5,100,908		13,019,806		13
Short-term investments	1,940,857		1,873,480		67,377		—
Equity securities, at fair value	809,869		775,264		31,566		3,039
Derivative instruments (2)	176,160		—		176,160		—
Residential mortgage loans	2,255		—		2,255		—
Fair value option:
Corporate bonds	524,177		—		524,177		—
Non-U.S. government bonds	4,032		—		4,032		—
Asset backed securities	2,094		—		2,094		—
Short-term investments	28,614		405		28,209		—
Equity securities	13,905		9,312		1		4,592
Other investments	175,259		—		141,021		34,238
Other investments measured at net asset value (1)	830,670
Total	1,578,751		9,717		699,534		38,830
Total assets measured at fair value	$	22,628,619	$	7,759,369	$	13,996,698	$	41,882
Liabilities measured at fair value:
Other liabilities	$	(13,421)	$	—	$	—	$	(13,421)
Derivative instruments (2)	(112,577)		—		(112,577)		—
Total liabilities measured at fair value	$	(125,998)	$	—	$	(112,577)	$	(13,421)

(1)    In accordance with applicable accounting guidance, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.

(2)    See note 9.

The following table presents the Company’s financial assets and liabilities measured at fair value by level at December 31, 2021:

			Estimated Fair Value Measurements Using:
	Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets measured at fair value:
Available for sale securities:
Fixed maturities:
Corporate bonds	$	6,553,333	$	—	$	6,553,320	$	13
Residential mortgage backed securities	408,477		—		408,477		—
Municipal bonds	404,666		—		404,666		—
Commercial mortgage backed securities	1,046,484		—		1,046,484		—
U.S. government and government agencies	4,772,764		4,744,517		28,247		—
Non-U.S. government securities	2,120,294		—		2,120,294		—
Asset backed securities	2,692,091		—		2,688,744		3,347
Total	17,998,109		4,744,517		13,250,232		3,360
Short-term investments	1,734,716		1,052,822		681,894		—
Equity securities, at fair value	1,804,170		1,762,864		38,388		2,918
Derivative instruments (2)	127,121		—		127,121		—
Residential mortgage loans	49,847		—		49,847		—
Fair value option:
Corporate bonds	388,546		—		388,546		—
Non-U.S. government bonds	23,785		—		23,785		—
Asset backed securities	4,367		—		4,367		—
Short-term investments	97,806		528		97,278		—
Equity securities	26,493		21,745		—		4,748
Other investments	310,798		20,352		262,465		27,981
Other investments measured at net asset value (1)	1,121,755
Total	1,973,550		42,625		776,441		32,729
Total assets measured at fair value	$	23,687,513	$	7,602,828	$	14,923,923	$	39,007
Liabilities measured at fair value:
Other liabilities	$	(16,960)	$	—	$	—	$	(16,960)
Derivative instruments (2)	(54,224)		—		(54,224)		—
Total liabilities measured at fair value	$	(71,184)	$	—	$	(54,224)	$	(16,960)

(1)    In accordance with applicable accounting guidance, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.

(2)    See note 9.

The following table presents a reconciliation of the beginning and ending balances for all financial assets and liabilities measured at fair value on a recurring basis using Level 3 inputs:

	Assets												Liabilities
s	Available For Sale				Fair Value Option						Fair Value
	Structured Securities (1)		Corporate Bonds		Corporate Bonds		Other Investments		Equity Securities		Equity Securities		Other Liabilities
Three Months Ended September 30, 2022
Balance at beginning of period	$	2,867	$	3,570	$	—	$	33,331	$	4,392	$	2,906	$	(16,205)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)	(601)		52		—		116		200		133		(89)
Included in other comprehensive income	144		(59)		—		—		—		—		965
Purchases, issuances, sales and settlements
Purchases	—		—		—		1,458		—		—		—
Issuances	—		—		—		—		—		—		—
Sales	(2,051)		(3,550)		—		(667)		—		—		—
Settlements	(359)		—		—		—		—		—		1,908
Transfers in and/or out of Level 3	—		—		—		—		—		—		—
Balance at end of period	$	—	$	13	$	—	$	34,238	$	4,592	$	3,039	$	(13,421)
Three Months Ended September 30, 2021
Balance at beginning of period	$	3,424	$	13	$	998	$	73,900	$	73,678	$	49,136	$	(466)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)	10		—		—		—		38		11		—
Included in other comprehensive income	10		—		—		—		—		—		—
Purchases, issuances, sales and settlements
Purchases	—		—		—		—		—		208		(17,345)
Issuances	—		—		—		—		—		—		—
Sales (3)	—		—		(998)		(44,143)		(69,181)		(46,773)		—
Settlements	—		—		—		—		—		—		—
Transfers in and/or out of Level 3	—		—		—		—		—		—		—
Balance at end of period	$	3,444	$	13	$	—	$	29,757	$	4,535	$	2,582	$	(17,811)
Nine Months Ended September 30, 2022
Balance at beginning of year	$	3,347	$	13	$	—	$	27,981	$	4,748	$	2,918	$	(16,960)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)	(592)		52		—		150		(156)		(103)		(284)
Included in other comprehensive income	(1)		(59)		—		—		—		—		1,915
Purchases, issuances, sales and settlements
Purchases	—		—		—		12,228		—		227		—
Issuances	—		—		—		—		—		—		—
Sales	(2,051)		(3,550)		—		(3,138)		—		(3)		—
Settlements	(703)		—		—		(2,983)		—		—		1,908
Transfers in and/or out of Level 3	—		3,557		—		—		—		—		—
Balance at end of period	$	—	$	13	$	—	$	34,238	$	4,592	$	3,039	$	(13,421)
Nine Months Ended September 30, 2021
Balance at beginning of year	$	3,426	$	13	$	985	$	67,103	$	68,988	$	42,015	$	(461)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)	(46)		—		13		881		4,728		1,837		—
Included in other comprehensive income	67		—		—		—		—		—		—
Purchases, issuances, sales and settlements
Purchases	—		—		—		13,003		—		5,503		(17,345)
Issuances	—		—		—		—		—		—		—
Sales (3)	—		—		(998)		(51,230)		(69,181)		(46,773)		—
Settlements	(3)		—		—		—		—		—		(5)
Transfers in and/or out of Level 3	—		—		—		—		—		—		—
Balance at end of period	$	3,444	$	13	$	—	$	29,757	$	4,535	$	2,582	$	(17,811)

(1)    Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.

(2)    Gains or losses were included in net realized gains (losses).

(3)    Sales for the 2021 periods primarily related to the Company’s deconsolidation of Somers..

Financial Instruments Disclosed, But Not Carried, At Fair Value

The Company uses various financial instruments in the normal course of its business. The carrying values of cash, accrued investment income, receivable for securities sold, certain other assets, payable for securities purchased and certain other liabilities approximated their fair values at September 30, 2022, due to their respective short maturities. As these financial instruments are not actively traded, their respective fair values are classified within Level 2.

At September 30, 2022, the Company’s senior notes were carried at their cost, net of debt issuance costs, of $2.7 billion and had a fair value of $2.3 billion. At December 31, 2021, the Company’s senior notes were carried at their cost, net of debt issuance costs, of $2.7 billion and had a fair value of $3.3 billion. The fair values of the senior notes were obtained from a third party pricing service and are based on observable market inputs. As such, the fair values of the senior notes are classified within Level 2.

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Derivative Instruments

9 Months Ended

Sep. 30, 2022

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

The Company’s investment strategy allows for the use of derivative instruments. The Company’s derivative instruments are recorded on its consolidated balance sheets at fair value. The Company utilizes exchange traded U.S. Treasury note, Eurodollar and other futures contracts and commodity futures to manage portfolio duration or replicate investment positions in its portfolios and the Company routinely utilizes foreign currency forward contracts, currency options, index futures contracts and other derivatives as part of its total return objective. In addition, certain of the Company’s investments are managed in portfolios which incorporate the use of foreign currency forward contracts which are intended to provide an economic hedge against foreign currency movements. 

In addition, the Company purchases to-be-announced mortgage backed securities (“TBAs”) as part of its investment strategy. TBAs represent commitments to purchase a future issuance of agency mortgage backed securities. For the period between purchase of a TBA and issuance of the underlying security, the Company’s position is accounted for as a derivative. The Company purchases TBAs in both long and short positions to enhance investment performance and as part of its overall investment strategy.

The following table summarizes information on the fair values and notional values of the Company’s derivative instruments:

	Estimated Fair Value
	Asset Derivatives (1)		Liability Derivatives (1)		Notional Value (2)
September 30, 2022
Futures contracts	$	72,730	$	(60,684)	$	2,189,945
Foreign currency forward contracts	25,281		(26,995)		835,941
TBAs	—		—		—
Other	78,149		(24,898)		3,766,549
Total	$	176,160	$	(112,577)
December 31, 2021
Futures contracts	$	34,999	$	(9,808)	$	2,826,564
Foreign currency forward contracts	7,734		(11,390)		915,962
TBAs	11,227		—		11,227
Other	73,161		(33,026)		3,736,773
Total	$	127,121	$	(54,224)

(1)    The fair value of asset derivatives are included in ‘other assets’ and the fair value of liability derivatives are included in ‘other liabilities.’

(2)    Represents the absolute notional value of all outstanding contracts, consisting of long and short positions.

The Company did not hold any derivatives which were designated as hedging instruments at September 30, 2022 or December 31, 2021.

The Company’s derivative instruments can be traded under master netting agreements, which establish terms that apply to all derivative transactions with a counterparty. In the event of a bankruptcy or other stipulated event of default, such agreements provide that the non-defaulting party may elect to terminate all outstanding derivative transactions, in which case all individual derivative positions (loss or gain) with a counterparty are closed out and netted and replaced with a single amount, usually referred to as the termination amount, which is expressed in a single currency. The resulting single net amount, where positive, is payable to the party “in-the-money” regardless of whether or not it is the defaulting party, unless the parties have agreed that only the non-defaulting party is entitled to receive a termination payment where the net amount is positive and is in its favor. Contractual close-out netting reduces derivatives credit exposure from gross to net exposure.

At September 30, 2022, asset derivatives and liability derivatives of $164.9 million and $112.6 million, respectively, were subject to a master netting agreement, compared to $122.3 million and $53.9 million, respectively, at December 31, 2021. The remaining derivatives included in the preceding table were not subject to a master netting agreement.

Realized and unrealized contract gains and losses on the Company’s derivative instruments are reflected in ‘net realized gains (losses)’ in the consolidated statements of income, as summarized in the following table:

Derivatives not designated as	September 30,
hedging instruments:	2022		2021
Three Months Ended
Net realized gains (losses):
Futures contracts	$	(26,347)	$	(10,073)
Foreign currency forward contracts	(18,340)		(16,146)
TBAs	—		(46)
Other (1)	(3,509)		4,830
Total	$	(48,196)	$	(21,435)
Nine Months Ended
Net realized gains (losses):
Futures contracts	$	(112,326)	$	(17,394)
Foreign currency forward contracts	(46,016)		(36,922)
TBAs	(51)		(46)
Other (1)	40,802		17,934
Total	$	(117,591)	$	(36,428)

(1)    Includes realized gains and losses on swaps, options and other derivatives contracts.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2022

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Letter of Credit and Revolving Credit Facilities

In the normal course of its operations, the Company enters into agreements with financial institutions to obtain secured and unsecured credit facilities. On April 7, 2022, Arch Capital and certain of its subsidiaries amended the existing five-year credit agreement into a $925.0 million facility (the “Credit Facility”) with a syndication of lenders. The Credit Facility, as amended, consists of a $425.0 million secured facility for letters of credit (the “Secured Facility”) and a $500.0 million unsecured facility for revolving loans and letters of credit (the “Unsecured Facility”). Obligations of each borrower under the Secured Facility for letters of credit are secured by cash and eligible securities of such borrower held in collateral accounts. Commitments under the Credit Facility may be increased up to, but not exceeding, an aggregate of $1.3 billion. Arch Capital has a one-time option to convert any or all outstanding revolving loans of Arch Capital and/or Arch-U.S. to term loans with the same terms as the revolving loans except that any prepayments may not be re-borrowed. Arch-U.S. guarantees the obligations of Arch Capital, and Arch Capital guarantees the obligations of Arch-U.S. Borrowings of revolving loans may be made at a variable rate based on SOFR. Secured letters of credit are available for issuance on behalf of certain Arch Capital subsidiaries. At September 30, 2022, the $425.0 million secured letter of credit facility, had $311.8 million of letters of credit outstanding and remaining capacity of

$113.2 million. In addition, certain of Arch Capital’s subsidiaries had outstanding secured and unsecured letters of credit through other facilities of $22.7 million and $290.0 million respectively, which were issued in the normal course of business.

Investment Commitments

The Company’s investment commitments, which are primarily related to agreements entered into by the Company to invest in funds and separately managed accounts when called upon, were approximately $3.1 billion at September 30, 2022, compared to $3.0 billion at December 31, 2021.

Interest Paid

Interest paid on the Company’s senior notes and other borrowings were $65.0 million for the nine months ended September 30, 2022, compared to $75.8 million for the 2021 period

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Variable Interest Entities and Noncontrolling Interests

9 Months Ended

Sep. 30, 2022

Noncontrolling Interest [Abstract]

Variable Interest Entity and Noncontrolling Interests

Somers

In March 2014, the Company invested $100.0 million and acquired approximately 11% of Somers’ outstanding common equity. Somers was considered a VIE and the Company concluded that it was the primary beneficiary of Somers, through June 30, 2021. As such, the results of Somers were included in the Company’s consolidated financial statements as of and for the periods ended June 30, 2021.

In the 2020 fourth quarter, Arch Capital, Somers and Greysbridge, a wholly-owned subsidiary of Arch Capital, entered into an Agreement and Plan of Merger (as amended, the “Merger Agreement”). The merger contemplated by the Merger Agreement and the related Greysbridge equity financing closed on July 1, 2021. In connection therewith and effective July 1, 2021, Somers became wholly owned by Greysbridge, and Greysbridge is now owned 40% by the Company, 30% by certain investment funds managed by Kelso and 30% by certain investment funds managed by Warburg. Based on the governing documents of Greysbridge, the Company concluded that, while it retains significant influence over Somers, Somers no longer constitutes a variable interest entity. Accordingly, effective July 1, 2021, the Company no longer consolidates the results of Somers in its consolidated financial statements and footnotes. Beginning in the 2021 third quarter, the Company classifies its investment as ‘investments in operating affiliates’ on the Company’s balance sheets and is accounted for under the equity method.

Through June 30, 2021, Somers generated $47.0 million of cash provided by operating activities, $96.3 million of cash provided by investing activities and $2.0 million of cash used for financing activities.

Redeemable noncontrolling interests

The following table sets forth activity in the redeemable non-controlling interests:

	September 30,
	2022		2021
Three Months Ended
Balance, beginning of period	$	8,459	$	57,533
Impact of deconsolidation of Somers	—		(48,919)
Other	449		1,623
Balance, end of period	$	8,908	$	10,237
Nine Months Ended
Balance, beginning of year	$	9,233	$	58,548
Impact of deconsolidation of Somers	—		(48,919)
Other	(325)		608
Balance, end of period	$	8,908	$	10,237

The portion of income or loss attributable to third party investors, recorded in the Company’s consolidated statements of income in ‘net (income) loss attributable to noncontrolling interests,’ are summarized in the table below:

	September 30,
	2022		2021
Three Months Ended
Amounts attributable to non-redeemable noncontrolling interests	$	—	$	—
Amounts attributable to redeemable noncontrolling interests	(1,157)		(1,473)
Net (income) loss attributable to noncontrolling interests	$	(1,157)	$	(1,473)
Nine Months Ended
Amounts attributable to non-redeemable noncontrolling interests	$	—	$	(78,314)
Amounts attributable to redeemable noncontrolling interests	(2,390)		(3,889)
Net (income) loss attributable to noncontrolling interests	$	(2,390)	$	(82,203)

Bellemeade Re

The Company has entered into aggregate excess of loss mortgage reinsurance agreements with various special purpose reinsurance companies domiciled in Bermuda (the “Bellemeade Agreements”). At the time the Bellemeade Agreements were entered into, the applicability of the accounting guidance that addresses VIEs was evaluated. As a result of the evaluation of the Bellemeade Agreements, the Company concluded that these entities are VIEs. However, given that the ceding insurers do not have the unilateral power to direct those activities that are significant to their economic performance, the Company does not consolidate such entities in its consolidated financial statements. The following table presents the total assets of the Bellemeade entities, as well as the Company’s maximum exposure to loss associated with these VIEs, calculated as the maximum historical observable spread between the benchmark index for each respective transaction and short term invested trust asset yields. The benchmark index for agreements effective prior to 2021 is based on one-month LIBOR, while the 2021 and later agreements benchmark index is based on the Secured Overnight Financing Rate (“SOFR”). SOFR is a measure of the cost of borrowing cash overnight, collateralized by U.S. Treasury securities, and is based on directly observable U.S. Treasury-backed repurchase transactions.

			September 30, 2022										December 31, 2021
			Maximum Exposure to Loss										Maximum Exposure to Loss
Bellemeade Entities (Issue Date)	Total VIE Assets		On-Balance Sheet (Asset) Liability		Off-Balance Sheet		Total		Coverage Remaining from Reinsurers (1)		Total VIE Assets		On-Balance Sheet (Asset) Liability		Off-Balance Sheet		Total
2017-1 Ltd. (Oct-17)	$	46,772	$	(23)	$	88	$	65	$	—	$	108,368	$	(159)	$	424	$	265
2018-1 Ltd. (Apr-18)	103,131		(220)		644		424		—		181,136		(528)		1,268		740
2018-3 Ltd. (Oct-18)	217,701		(862)		2,107		1,245		—		302,563		(1,018)		2,496		1,478
2019-1 Ltd. (Mar-19)	119,193		(496)		2,704		2,208		—		181,324		(380)		5,807		5,427
2019-2 Ltd. (Apr-19)	347,050		(656)		4,308		3,652		—		398,316		(515)		3,998		3,483
2019-3 Ltd. (Jul-19)	257,663		(192)		1,492		1,300		—		409,859		(584)		3,190		2,606
2019-4 Ltd. (Oct-19)	283,684		(532)		3,663		3,131		—		411,954		(462)		4,759		4,297
2020-2 Ltd. (Sep-20)	122,897		(20)		595		575		153		217,766		(177)		1,984		1,807
2020-3 Ltd. (Nov-20)	268,385		(204)		2,845		2,641		8,569		348,818		(128)		5,793		5,665
2020-4 Ltd. (Dec-20)	107,396		10		707		717		4,795		176,826		(50)		1,630		1,580
2021-1 Ltd. (Mar-21)	497,069		(2,234)		936		(1,298)		43,198		568,986		(303)		3,283		2,980
2021-2 Ltd. (Jun-21)	471,039		(2,047)		984		(1,063)		80,268		522,807		281		4,124		4,405
2021-3 Ltd. (Sep-21)	498,309		(2,414)		991		(1,423)		129,127		507,873		(411)		3,446		3,035
2022-1 Ltd. (Jan-22)	283,500		(1,326)		627		(699)		33,260
2022-2 Ltd. (Sep-22)	201,005		—		744		744		126,160
Total	$	3,824,794	$	(11,216)	$	23,435	$	12,219	$	425,530	$	4,336,596	$	(4,434)	$	42,202	$	37,768

(1) Coverage from a separate panel of reinsurers remaining at September 30, 2022.

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Other Comprehensive Income (Loss)

9 Months Ended

Sep. 30, 2022

Comprehensive Income Note Disclosure [Abstract]

Other Comprehensive Income (Loss)

The following tables present details about amounts reclassified from accumulated other comprehensive income and the tax effects allocated to each component of other comprehensive income (loss):

		Amounts Reclassified from AOCI
	Consolidated Statement of Income	Three Months Ended				Nine Months Ended
Details About	Line Item That Includes	September 30,				September 30,
AOCI Components	Reclassification	2022		2021		2022		2021
Unrealized appreciation (decline) on available-for-sale investments
	Net realized gains (losses)	$	(55,940)	$	68,373	$	(186,570)	$	135,291
	Provision for credit losses	8,652		(457)		(48,096)		(1,208)
	Total before tax	(47,288)		67,916		(234,666)		134,083
	Income tax (expense) benefit	703		(5,262)		28,093		(13,579)
	Net of tax	$	(46,585)	$	62,654	$	(206,573)	$	120,504

	Before Tax Amount		Tax Expense (Benefit)		Net of Tax Amount
Three Months Ended September 30, 2022
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains (losses) arising during period	$	(671,907)	$	(62,148)	$	(609,759)
Less reclassification of net realized gains (losses) included in net income	(47,288)		(703)		(46,585)
Foreign currency translation adjustments	(70,388)		—		(70,388)
Other comprehensive income (loss)	$	(695,007)	$	(61,445)	$	(633,562)
Three Months Ended September 30, 2021
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains (losses) arising during period	$	(104,607)	$	(8,684)	$	(95,923)
Less reclassification of net realized gains (losses) included in net income	67,916		5,262		62,654
Foreign currency translation adjustments	(32,060)		(350)		(31,710)
Other comprehensive income (loss)	$	(204,583)	$	(14,296)	$	(190,287)
Nine Months Ended September 30, 2022
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains (losses) arising during period	$	(2,132,845)	$	(240,726)	$	(1,892,119)
Less reclassification of net realized gains (losses) included in net income	(234,666)		(28,093)		(206,573)
Foreign currency translation adjustments	(141,515)		166		(141,681)
Other comprehensive income (loss)	$	(2,039,694)	$	(212,467)	$	(1,827,227)
Nine Months Ended September 30, 2021
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains (losses) arising during period	$	(307,910)	$	(28,808)	$	(279,102)
Less reclassification of net realized gains (losses) included in net income	134,083		13,579		120,504
Foreign currency translation adjustments	(54,083)		6		(54,089)
Other comprehensive income (loss)	$	(496,076)	$	(42,381)	$	(453,695)

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Income Taxes

9 Months Ended

Sep. 30, 2022

Income Tax Disclosure [Abstract]

Income Taxes

The Company’s income tax provision on income before income taxes, including income (loss) from operating affiliates, resulted in an effective tax rate of 3.0% for the nine months ended September 30, 2022, compared to 5.5% for the nine months ended September 30, 2021. The effective tax rate for the nine months ended September 30, 2022 and 2021 periods included discrete income tax benefits of $36.5 million and $28.7 million, respectively. The discrete income tax benefits had the effect of decreasing the effective tax rate on net income available to Arch common shareholders by 5.7% and 1.7%, respectively. The discrete tax items in both periods were primarily related to the release of a valuation allowance on certain U.K. deferred tax assets.

The Company’s effective tax rate, which is based upon the expected annual effective tax rate, may fluctuate from period to period based on the relative mix of income or loss reported by jurisdiction and the varying tax rates in each jurisdiction.

The Company had a net deferred tax asset of $572.1 million at September 30, 2022, compared to a net deferred tax asset of $194.0 million at December 31, 2021. The change is primarily a result of market value fluctuations in the investment portfolio. In addition, the Company paid $201.6 million and $202.4 million of income taxes for the nine months ended September 30, 2022 and 2021, respectively.

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Legal Proceedings	9 Months Ended
	Sep. 30, 2022
Disclosure Legal Proceedings [Abstract]
Legal Proceedings	The Company, in common with the insurance industry in general, is subject to litigation and arbitration in the normal course of its business. As of September 30, 2022, the Company was not a party to any litigation or arbitration which is expected by management to have a material adverse effect on the Company’s results of operations and financial condition and liquidity.

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Transactions With Related Parties

9 Months Ended

Sep. 30, 2022

Related Party Transactions [Abstract]

Transactions with related parties

In the 2021 first quarter, as part of the Company’s acquisition of Barbican, the Company entered into an agreement with Premia Managing Agency Limited for the reinsurance to close of Syndicate 1955’s 2018 underwriting year of account into Premia Syndicate 1884’s 2021 underwriting year of account. The reinsurance to close covers legacy business underwritten by Syndicate 1955 on the underwriting 2018 and prior years of account and under the agreement, approximately $380 million of net liabilities was transferred to Syndicate 1884, with an effective date of January 1, 2021. The Company had no reinsurance recoverable on unpaid and paid losses or funds held liability at September 30, 2022 and December 31, 2021.

In July 2021, following consummation of the Merger Agreement and the related Greysbridge equity financing, pursuant to which Somers became wholly owned by Greysbridge, and Greysbridge became owned 40% by the Company, 30% by certain funds managed by Kelso and 30% by certain funds managed by Warburg, the Company entered into certain reinsurance transactions with Somers. For the three and nine months ended September 30, 2022, the Company ceded premiums written related to such transactions of $236.5 million and $661.1 million, respectively (which includes reinsurance transactions in force as well as those entered into in conjunction with the Merger Agreement). For the three and nine months ended September 30, 2021, the Company ceded premiums written related to such transactions of $316.2 million. In addition, Somers paid certain acquisition costs and administrative fees to the Company. At September 30, 2022, reinsurance recoverable on unpaid and paid losses from Somers was $1.1 billion, with a reinsurance balance payable to Somers of $408.0 million. At December 31, 2021, reinsurance recoverable on unpaid and paid losses from Somers was $902.8 million, with a reinsurance balance payable to Somers of $258.4 million. See note 11 for information about Somers.

The Company has a put/call option that was entered into in connection with the Greysbridge equity financing, whereby beginning January 1, 2024 the Company will have a call right (but not the obligation) and Warburg and Kelso will each have a put right (but not the obligation) to buy/sell one third of their initial shares annually at the tangible book value per share of Greysbridge for the most recently ended fiscal quarter.

As of September 30, 2022, the Company owns $35.0 million in aggregate principal amount of Somers Group Holdings Ltd’s 6.5% senior notes, due July 2, 2029

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Basis of Presentation and Recent Accounting Pronouncements (Policies)

9 Months Ended

Sep. 30, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of accounting

The interim consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). All significant intercompany transactions and balances have been eliminated in consolidation.

Use of estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates and assumptions. In the opinion of management, the accompanying unaudited interim consolidated financial statements reflect all adjustments (consisting of normally recurring accruals) necessary for a fair statement of results on an interim basis. The results of any interim period are not necessarily indicative of the results for a full year or any future periods.

Reclassification of prior periods

The Company has reclassified the presentation of certain prior year information to conform to the current presentation. Such reclassifications had no effect on the Company’s net income, comprehensive income, shareholders’ equity or cash flows.

Recent accounting pronouncements

Inflation Reduction Act of 2022

On August 16, 2022, the U.S. government enacted the Inflation Reduction Act of 2022, which among other things implements a 15% minimum tax on book income of certain large corporations, a 1% excise tax on net stock repurchases and several tax incentives to promote clean energy. The effective date of these provisions is January 1, 2023. Based on its current analysis of the provisions, the Company does not expect that this legislation will have a material effect on the Company’s consolidated financial statements.

Recently Issued Accounting Standards Adopted

For information regarding additional accounting standards that the Company has not yet adopted, see note 3(s), “Significant Accounting Policies—Recent Accounting Pronouncements,” of the notes to consolidated financial statements in the Company’s 2021 Form 10-K

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Earnings Per Common Share (Tables)

9 Months Ended

Sep. 30, 2022

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted earnings per common share

The following table sets forth the computation of basic and diluted earnings per common share:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Numerator:
Net income (loss)	$	18,258	$	421,415	$	619,635	$	1,615,787
Amounts attributable to noncontrolling interests	(1,157)		(1,473)		(2,390)		(82,203)
Net income (loss) available to Arch	17,101		419,942		617,245		1,533,584
Preferred dividends	(10,184)		(16,090)		(30,552)		(38,159)
Loss on redemption of preferred shares	—		(15,101)		—		(15,101)
Net income (loss) available to Arch common shareholders	$	6,917	$	388,751	$	586,693	$	1,480,324
Denominator:
Weighted average common shares and common share equivalents outstanding — basic	365,190,527		389,274,220		369,525,348		395,899,591
Effect of dilutive common share equivalents:
Nonvested restricted shares	2,351,039		2,131,915		2,171,158		1,877,930
Stock options (1)	6,185,711		6,497,212		6,676,674		6,482,964
Weighted average common shares and common share equivalents outstanding — diluted	373,727,277		397,903,347		378,373,180		404,260,485
Earnings per common share:
Basic	$	0.02	$	1.00	$	1.59	$	3.74
Diluted	$	0.02	$	0.98	$	1.55	$	3.66

(1)    Certain stock options were not included in the computation of diluted earnings per share where the exercise price of the stock options exceeded the average market price and would have been anti-dilutive or where, when applying the treasury stock method to in-the-money options, the sum of the proceeds, including unrecognized compensation, exceeded the average market price and would have been anti-dilutive. For the 2022 third quarter and 2021 third quarter, the number of stock options excluded were 774,481 and 1,948,006, respectively. For the nine months ended September 30, 2022 and 2021, the number of stock options excluded were 785,682 and 2,397,507, respectively.

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2022

Segment Reporting [Abstract]

Analysis of underwriting income or loss by segment and reconciliation to net income available to common shareholders

The following tables summarize the Company’s underwriting income or loss by segment, together with a reconciliation of underwriting income or loss to net income available to Arch common shareholders:

	Three Months Ended
	September 30, 2022
	Insurance			Reinsurance			Mortgage			Sub-Total			Other			Total
Gross premiums written (1)	$	1,862,026		$	1,639,061		$	362,409		$	3,860,683		$	—		$	3,860,683
Premiums ceded	(493,267)			(560,225)			(86,230)			(1,136,909)			—			(1,136,909)
Net premiums written	1,368,759			1,078,836			276,179			2,723,774			—			2,723,774
Change in unearned premiums	(181,851)			(77,062)			5,889			(253,024)			—			(253,024)
Net premiums earned	1,186,908			1,001,774			282,068			2,470,750			—			2,470,750
Other underwriting income (loss)	—			452			2,625			3,077			—			3,077
Losses and loss adjustment expenses	(822,663)			(927,911)			67,878			(1,682,696)			—			(1,682,696)
Acquisition expenses	(232,469)			(208,425)			(6,693)			(447,587)			—			(447,587)
Other operating expenses	(165,499)			(62,777)			(46,471)			(274,747)			—			(274,747)
Underwriting income (loss)	$	(33,723)		$	(196,887)		$	299,407		68,797			—			68,797
Net investment income										128,640			—			128,640
Net realized gains (losses)										(183,673)			—			(183,673)
Equity in net income (loss) of investment funds accounted for using the equity method										(18,861)			—			(18,861)
Other income (loss)										(13,684)			—			(13,684)
Corporate expenses (2)										(17,634)			—			(17,634)
Transaction costs and other (2)										(76)			—			(76)
Amortization of intangible assets										(26,104)			—			(26,104)
Interest expense										(33,063)			—			(33,063)
Net foreign exchange gains (losses)										90,509			—			90,509
Income (loss) before income taxes and income (loss) from operating affiliates										(5,149)			—			(5,149)
Income tax (expense) benefit										14,900			—			14,900
Income (loss) from operating affiliates										8,507			—			8,507
Net income (loss)										18,258			—			18,258
Amounts attributable to redeemable noncontrolling interests										(1,157)			—			(1,157)
Net income (loss) available to Arch										17,101			—			17,101
Preferred dividends										(10,184)			—			(10,184)
Net income (loss) available to Arch common shareholders										$	6,917		$	—		$	6,917
Underwriting Ratios
Loss ratio	69.3		%	92.6		%	(24.1)		%	68.1		%	—		%	68.1		%
Acquisition expense ratio	19.6		%	20.8		%	2.4		%	18.1		%	—		%	18.1		%
Other operating expense ratio	13.9		%	6.3		%	16.5		%	11.1		%	—		%	11.1		%
Combined ratio	102.8		%	119.7		%	(5.2)		%	97.3		%	—		%	97.3		%
Goodwill and intangible assets	$	224,525		$	140,800		$	441,330		$	806,655		$	—		$	806,655

(1)    Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)    Certain expenses have been excluded from ‘corporate expenses’ and reflected in ‘transaction costs and other.’

	Three Months Ended
	September 30, 2021
	Insurance			Reinsurance			Mortgage			Sub-Total			Other			Total
Gross premiums written (1)	$	1,596,619		$	1,251,760		$	360,934		$	3,207,415		$	—		$	3,207,415
Premiums ceded	(442,806)			(630,371)			(60,207)			(1,131,486)			—			(1,131,486)
Net premiums written	1,153,813			621,389			300,727			2,075,929			—			2,075,929
Change in unearned premiums	(215,143)			57,313			11,238			(146,592)			—			(146,592)
Net premiums earned	938,670			678,702			311,965			1,929,337			—			1,929,337
Other underwriting income (loss)	—			3,293			3,981			7,274			—			7,274
Losses and loss adjustment expenses	(668,630)			(545,846)			(11,543)			(1,226,019)			—			(1,226,019)
Acquisition expenses	(152,467)			(129,450)			(24,098)			(306,015)			—			(306,015)
Other operating expenses	(138,931)			(45,647)			(46,254)			(230,832)			—			(230,832)
Underwriting income (loss)	$	(21,358)		$	(38,948)		$	234,051		173,745			—			173,745
Net investment income										88,195			—			88,195
Net realized gains (losses)										(25,040)			—			(25,040)
Equity in net income (loss) of investment funds accounted for using the equity method										105,398			—			105,398
Other income (loss)										(3,960)			—			(3,960)
Corporate expenses (2)										(18,636)			—			(18,636)
Transaction costs and other (2)										(1,036)			—			(1,036)
Amortization of intangible assets										(20,135)			—			(20,135)
Interest expense										(33,176)			—			(33,176)
Net foreign exchange gains (losses)										36,078			—			36,078
Income (loss) before income taxes and income (loss) from operating affiliates										301,433			—			301,433
Income tax (expense) benefit										(4,137)			—			(4,137)
Income (loss) from operating affiliates										124,119			—			124,119
Net income (loss)										421,415			—			421,415
Amounts attributable to redeemable noncontrolling interests										(1,473)			—			(1,473)
Net income (loss) available to Arch										419,942			—			419,942
Preferred dividends										(16,090)			—			(16,090)
Loss on redemption of preferred shares										(15,101)			—			(15,101)
Net income (loss) available to Arch common shareholders										$	388,751		$	—		$	388,751
Underwriting Ratios
Loss ratio	71.2		%	80.4		%	3.7		%	63.5		%	—		%	63.5		%
Acquisition expense ratio	16.2		%	19.1		%	7.7		%	15.9		%	—		%	15.9		%
Other operating expense ratio	14.8		%	6.7		%	14.8		%	12.0		%	—		%	12.0		%
Combined ratio	102.2		%	106.2		%	26.2		%	91.4		%	—		%	91.4		%
Goodwill and intangible assets	$	261,103		$	176,128		$	526,091		$	963,322		$	—		$	963,322

(1)    Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)    Certain expenses have been excluded from ‘corporate expenses’ and reflected in ‘transaction costs and other.’

	Nine Months Ended
	September 30, 2022
	Insurance			Reinsurance			Mortgage			Sub-Total			Other			Total
Gross premiums written (1)	$	5,286,798		$	5,151,401		$	1,099,144		$	11,531,185		$	—		$	11,531,185
Premiums ceded	(1,482,886)			(1,770,807)			(241,097)			(3,488,632)			—			(3,488,632)
Net premiums written	3,803,912			3,380,594			858,047			8,042,553			—			8,042,553
Change in unearned premiums	(488,164)			(646,421)			9,190			(1,125,395)			—			(1,125,395)
Net premiums earned	3,315,748			2,734,173			867,237			6,917,158			—			6,917,158
Other underwriting income (loss)	—			5,814			6,130			11,944			—			11,944
Losses and loss adjustment expenses	(2,053,161)			(1,920,189)			187,163			(3,786,187)			—			(3,786,187)
Acquisition expenses	(641,807)			(569,915)			(27,343)			(1,239,065)			—			(1,239,065)
Other operating expenses	(493,412)			(198,606)			(150,064)			(842,082)			—			(842,082)
Underwriting income (loss)	$	127,368		$	51,277		$	883,123		$	1,061,768		$	—		$	1,061,768
Net investment income										315,468			—			315,468
Net realized gains (losses)										(742,666)			—			(742,666)
Equity in net income (loss) of investment funds accounted for using the equity method										75,505			—			75,505
Other income (loss)										(34,486)			—			(34,486)
Corporate expenses (2)										(76,928)			—			(76,928)
Transaction costs and other (2)										(734)			—			(734)
Amortization of intangible assets										(80,478)			—			(80,478)
Interest expense										(98,566)			—			(98,566)
Net foreign exchange gains (losses)										182,129			—			182,129
Income (loss) before income taxes and income (loss) from operating affiliates										601,012			—			601,012
Income tax (expense) benefit										(19,042)			—			(19,042)
Income (loss) from operating affiliates										37,665			—			37,665
Net income (loss)										619,635			—			619,635
Amounts attributable to redeemable noncontrolling interests										(2,390)			—			(2,390)
Net income (loss) available to Arch										617,245			—			617,245
Preferred dividends										(30,552)			—			(30,552)
Net income (loss) available to Arch common shareholders										$	586,693		$	—		$	586,693
Underwriting Ratios
Loss ratio	61.9		%	70.2		%	(21.6)		%	54.7		%	—		%	54.7		%
Acquisition expense ratio	19.4		%	20.8		%	3.2		%	17.9		%	—		%	17.9		%
Other operating expense ratio	14.9		%	7.3		%	17.3		%	12.2		%	—		%	12.2		%
Combined ratio	96.2		%	98.3		%	(1.1)		%	84.8		%	—		%	84.8		%

(1)    Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)    Certain expenses have been excluded from ‘corporate expenses’ and reflected in ‘transaction costs and other.’

	Nine Months Ended
	September 30, 2021
	Insurance			Reinsurance			Mortgage			Sub-Total			Other			Total
Gross premiums written (1)	$	4,381,372		$	4,080,840		$	1,143,691		$	9,602,213		$	457,465		$	9,890,912
Premiums ceded	(1,269,165)			(1,535,607)			(171,923)			(2,973,005)			(102,763)			(2,907,002)
Net premiums written	3,112,207			2,545,233			971,768			6,629,208			354,702			6,983,910
Change in unearned premiums	(488,636)			(484,607)			10,735			(962,508)			(22,734)			(985,242)
Net premiums earned	2,623,571			2,060,626			982,503			5,666,700			331,968			5,998,668
Other underwriting income (loss)	—			3,148			15,026			18,174			739			18,913
Losses and loss adjustment expenses	(1,750,257)			(1,494,539)			(85,112)			(3,329,908)			(259,042)			(3,588,950)
Acquisition expenses	(417,541)			(381,060)			(84,297)			(882,898)			(62,741)			(945,639)
Other operating expenses	(409,386)			(150,856)			(143,697)			(703,939)			(32,869)			(736,808)
Underwriting income (loss)	$	46,387		$	37,319		$	684,423		$	768,129		$	(21,945)		$	746,184
Net investment income										256,354			42,310			298,664
Net realized gains (losses)										239,690			80,638			320,328
Equity in net income (loss) of investment funds accounted for using the equity method										299,270			—			299,270
Other income (loss)										1,151			—			1,151
Corporate expenses (2)										(59,279)			—			(59,279)
Transaction costs and other (2)										(793)			(935)			(1,728)
Amortization of intangible assets										(48,925)			(898)			(49,823)
Interest expense										(98,812)			(8,410)			(107,222)
Net foreign exchange gains (losses)										39,691			(1,325)			38,366
Income (loss) before income taxes and income (loss) from operating affiliates										1,396,476			89,435			1,485,911
Income tax (expense) benefit										(93,942)			(234)			(94,176)
Income (loss) from operating affiliates										224,052			—			224,052
Net income (loss)										1,526,586			89,201			1,615,787
Amounts attributable to redeemable noncontrolling interests										(1,936)			(1,953)			(3,889)
Amounts attributable to nonredeemable noncontrolling interests										—			(78,314)			(78,314)
Net income (loss) available to Arch										1,524,650			8,934			1,533,584
Preferred dividends										(38,159)			—			(38,159)
Loss on redemption of preferred shares										(15,101)			—			(15,101)
Net income (loss) available to Arch common shareholders										$	1,471,390		$	8,934		$	1,480,324
Underwriting Ratios
Loss ratio	66.7		%	72.5		%	8.7		%	58.8		%	78.0		%	59.8		%
Acquisition expense ratio	15.9		%	18.5		%	8.6		%	15.6		%	18.9		%	15.8		%
Other operating expense ratio	15.6		%	7.3		%	14.6		%	12.4		%	9.9		%	12.3		%
Combined ratio	98.2		%	98.3		%	31.9		%	86.8		%	106.8		%	87.9		%

(1)    Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)    Certain expenses have been excluded from ‘corporate expenses’ and reflected in ‘transaction costs and other.’

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Reserve for Losses and Loss Adjustment Expenses (Tables)

9 Months Ended

Sep. 30, 2022

Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]

Analysis of losses and loss adjustment expenses and reconciliation of beginning and ending reserve balances

The following table represents an analysis of losses and loss adjustment expenses and a reconciliation of the beginning and ending reserve for losses and loss adjustment expenses:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2022		2021		2022		2021
Reserve for losses and loss adjustment expenses at beginning of period	$	18,194,324	$	17,196,648	$	17,757,156	$	16,513,929
Unpaid losses and loss adjustment expenses recoverable	5,686,348		4,146,020		5,599,231		4,314,855
Net reserve for losses and loss adjustment expenses at beginning of period	12,507,976		13,050,628		12,157,925		12,199,074
Net incurred losses and loss adjustment expenses relating to losses occurring in:
Current year	1,863,519		1,348,528		4,280,048		3,812,381
Prior years	(180,823)		(122,509)		(493,861)		(223,431)
Total net incurred losses and loss adjustment expenses	1,682,696		1,226,019		3,786,187		3,588,950
Net losses and loss adjustment expense reserves of acquired business (1)	—		104,307		—		104,307
Retroactive reinsurance transactions (2)	—		—		—		(183,893)
Impact of deconsolidation of Somers (3)	—		(1,460,611)		—		(1,460,611)
Net foreign exchange (gains) losses and other	(243,387)		(78,152)		(524,682)		10,818
Net paid losses and loss adjustment expenses relating to losses occurring in:
Current year	(226,575)		(208,923)		(463,847)		(432,348)
Prior years	(538,967)		(417,368)		(1,773,840)		(1,610,397)
Total net paid losses and loss adjustment expenses	(765,542)		(626,291)		(2,237,687)		(2,042,745)
Net reserve for losses and loss adjustment expenses at end of period	13,181,743		12,215,900		13,181,743		12,215,900
Unpaid losses and loss adjustment expenses recoverable	6,106,548		5,115,147		6,106,548		5,115,147
Reserve for losses and loss adjustment expenses at end of period	$	19,288,291	$	17,331,047	$	19,288,291	$	17,331,047

(1)     Represents activity related to the Company’s acquisitions in the 2021 period of the Westpac Lenders Mortgage Insurance Limited and Somerset Bridge Group Limited, Southern Rock Holdings Limited and affiliates.

(2)     During the 2021 first quarter, the Company entered into a reinsurance to close and other related agreements with Premia Managing Agency Limited (“Premia”), in connection with the 2018 and prior years of account related to the acquisition of Barbican Group Holdings Limited (“Barbican”).

(3)    See note 11.

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Allowance for Expected Credit Losses (Tables)

9 Months Ended

Sep. 30, 2022

Credit Loss [Abstract]

Premiums receivable

The following table provides a roll forward of the allowance for expected credit losses of the Company’s premium receivables:

	Premium Receivables, Net of Allowance		Allowance for Expected Credit Losses
Three Months Ended September 30, 2022
Balance at beginning of period	$	3,634,182	$	38,170
Change for provision of expected credit losses (1)			59
Balance at end of period	$	3,579,380	$	38,229
Three Months Ended September 30, 2021
Balance at beginning of period	$	2,866,578	$	35,979
Change for provision of expected credit losses (1)			2,736
Balance at end of period	$	2,807,720	$	38,715
Nine Months Ended September 30, 2022
Balance at beginning of period	$	2,633,280	$	39,958
Change for provision of expected credit losses (1)			(1,729)
Balance at end of period	$	3,579,380	$	38,229
Nine Months Ended September 30, 2021
Balance at beginning of period	$	2,064,586	$	37,781
Change for provision of expected credit losses (1)			934
Balance at end of period	$	2,807,720	$	38,715

(1)Amounts deemed uncollectible are written-off in operating expenses. For the 2022 third quarter and 2021 third quarter, amounts written off were $1.9 million and $1.2 million, respectively. For the nine months ended September 30, 2022 and 2021 period, amounts written off were $6.6 million and $2.4 million, respectively.

Reinsurance recoverables

The following table provides a roll forward of the allowance for expected credit losses of the Company’s reinsurance recoverables:

	Reinsurance Recoverables, Net of Allowance		Allowance for Expected Credit Losses
Three Months Ended September 30, 2022
Balance at beginning of period	$	5,938,511	$	14,740
Change for provision of expected credit losses			2,626
Balance at end of period	$	6,356,456	$	17,366
Three Months Ended September 30, 2021
Balance at beginning of period	$	4,314,515	$	11,029
Change for provision of expected credit losses			1,802
Balance at end of period	$	5,358,852	$	12,831
Nine Months Ended September 30, 2022
Balance at beginning of period	$	5,880,735	$	13,230
Change for provision of expected credit losses			4,136
Balance at end of period	$	6,356,456	$	17,366
Nine Months Ended September 30, 2021
Balance at beginning of period	$	4,500,802	$	11,636
Change for provision of expected credit losses			1,195
Balance at end of period	$	5,358,852	$	12,831

Ceded credit risk

The following table summarizes the Company’s reinsurance recoverables on paid and unpaid losses (not including ceded unearned premiums):

	September 30,			December 31
	2022			2021
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses	$	6,356,456		$	5,880,735
% due from carriers with A.M. Best rating of “A-” or better	69.5		%	69.7		%
% due from all other rated carriers	0.1		%	0.1		%
% due from all other carriers with no A.M. Best rating (1)	30.4		%	30.2		%
Largest balance due from any one carrier as % of total shareholders’ equity	9.1		%	6.7		%

(1)    At September 30, 2022 and December 31, 2021 over 95% and 91% of such amount were collateralized through reinsurance trusts, funds withheld arrangements, letters of credit or other, respectively.

Contractholder receivables

The following table provides a roll forward of the allowance for expected credit losses of the Company’s contractholder receivables:

	Contract-holder Receivables, Net of Allowance		Allowance for Expected Credit Losses
Three Months Ended September 30, 2022
Balance at beginning of period	$	1,758,018	$	3,005
Change for provision of expected credit losses			(645)
Balance at end of period	$	1,735,730	$	2,360
Three Months Ended September 30, 2021
Balance at beginning of period	$	1,882,948	$	4,471
Change for provision of expected credit losses			(987)
Balance at end of period	1,824,990		$	3,484
Nine Months Ended September 30, 2022
Balance at beginning of period	$	1,828,691	$	3,437
Change for provision of expected credit losses			(1,077)
Balance at end of period	$	1,735,730	$	2,360
Nine Months Ended September 30, 2021
Balance at beginning of period	$	1,986,924	$	8,638
Change for provision of expected credit losses			(5,154)
Balance at end of period	1,824,990		$	3,484

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Investment Information (Tables)

9 Months Ended

Sep. 30, 2022

Disclosure Investment Information [Abstract]

Summary of fair value and cost or amortized cost of available for sale securities

The following table summarizes the fair value and cost or amortized cost of the Company’s securities classified as available for sale:

	Estimated Fair Value		Gross Unrealized Gains		Gross Unrealized Losses		Allowance for Expected Credit Losses		Cost or Amortized Cost
September 30, 2022
Fixed maturities:
Corporate bonds	$	7,096,269	$	51,777	$	(895,365)	$	(35,657)	$	7,975,514
Residential mortgage backed securities	763,371		7,561		(84,183)		2		839,991
Municipal bonds	407,724		5,437		(37,692)		(99)		440,078
Commercial mortgage backed securities	1,064,238		3,079		(50,010)		(1,583)		1,112,752
U.S. government and government agencies	5,126,407		36,074		(400,784)		—		5,491,117
Non-U.S. government securities	2,073,170		9,315		(287,583)		(1,720)		2,353,158
Asset backed securities	1,589,548		1,076		(105,037)		(6,936)		1,700,445
Total	18,120,727		114,319		(1,860,654)		(45,993)		19,913,055
Short-term investments	1,940,857		1,419		(1,633)		—		1,941,071
Total	$	20,061,584	$	115,738	$	(1,862,287)	$	(45,993)	$	21,854,126
December 31, 2021
Fixed maturities:
Corporate bonds	$	6,553,333	$	104,170	$	(69,194)	$	(2,037)	$	6,520,394
Residential mortgage backed securities	408,477		2,825		(5,410)		(48)		411,110
Municipal bonds	404,666		18,724		(1,409)		(2)		387,353
Commercial mortgage backed securities	1,046,484		1,740		(3,117)		(6)		1,047,867
U.S. government and government agencies	4,772,764		10,076		(45,967)		—		4,808,655
Non-U.S. government securities	2,120,294		54,048		(34,749)		(82)		2,101,077
Asset backed securities	2,692,091		6,540		(11,108)		(708)		2,697,367
Total	17,998,109		198,123		(170,954)		(2,883)		17,973,823
Short-term investments	1,734,716		568		(590)		—		1,734,738
Total	$	19,732,825	$	198,691	$	(171,544)	$	(2,883)	$	19,708,561

Summary of available for sale securities in a continual unrealized loss position

The following table summarizes, for all available for sale securities in an unrealized loss position, the fair value and gross unrealized loss by length of time the security has been in a continual unrealized loss position:

	Less than 12 Months				12 Months or More				Total
	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
September 30, 2022
Fixed maturities:
Corporate bonds	$	5,596,229	$	(625,774)	$	1,470,800	$	(269,591)	$	7,067,029	$	(895,365)
Residential mortgage backed securities	620,572		(63,732)		93,902		(20,451)		714,474		(84,183)
Municipal bonds	373,219		(36,039)		9,399		(1,653)		382,618		(37,692)
Commercial mortgage backed securities	995,680		(49,215)		34,445		(795)		1,030,125		(50,010)
U.S. government and government agencies	4,205,475		(303,805)		715,347		(96,979)		4,920,822		(400,784)
Non-U.S. government securities	1,728,965		(221,540)		301,298		(66,043)		2,030,263		(287,583)
Asset backed securities	1,193,405		(74,885)		310,838		(30,152)		1,504,243		(105,037)
Total	14,713,545		(1,374,990)		2,936,029		(485,664)		17,649,574		(1,860,654)
Short-term investments	227,201		(1,633)		—		—		227,201		(1,633)
Total	$	14,940,746	$	(1,376,623)	$	2,936,029	$	(485,664)	$	17,876,775	$	(1,862,287)
December 31, 2021
Fixed maturities:
Corporate bonds	$	3,639,582	$	(63,938)	$	98,867	$	(5,256)	$	3,738,449	$	(69,194)
Residential mortgage backed securities	222,176		(3,545)		46,809		(1,865)		268,985		(5,410)
Municipal bonds	26,665		(385)		16,361		(1,024)		43,026		(1,409)
Commercial mortgage backed securities	675,603		(2,805)		5,908		(312)		681,511		(3,117)
U.S. government and government agencies	4,211,621		(44,180)		33,373		(1,787)		4,244,994		(45,967)
Non-U.S. government securities	1,511,301		(31,983)		62,957		(2,766)		1,574,258		(34,749)
Asset backed securities	1,667,002		(9,853)		33,082		(1,255)		1,700,084		(11,108)
Total	11,953,950		(156,689)		297,357		(14,265)		12,251,307		(170,954)
Short-term investments	284,733		(590)		—		—		284,733		(590)
Total	$	12,238,683	$	(157,279)	$	297,357	$	(14,265)	$	12,536,040	$	(171,544)

Contractual maturities of the Company's fixed maturities

The contractual maturities of the Company’s fixed maturities are shown in the following table. Expected maturities, which are management’s best estimates, will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	September 30, 2022				December 31, 2021
Maturity	Estimated Fair Value		Amortized Cost		Estimated Fair Value		Amortized Cost
Due in one year or less	$	579,231	$	599,970	$	300,889	$	299,772
Due after one year through five years	10,029,151		10,808,495		8,355,255		8,339,387
Due after five years through 10 years	3,856,180		4,495,113		4,689,155		4,684,393
Due after 10 years	239,008		356,289		505,758		493,927
	14,703,570		16,259,867		13,851,057		13,817,479
Residential mortgage backed securities	763,371		839,991		408,477		411,110
Commercial mortgage backed securities	1,064,238		1,112,752		1,046,484		1,047,867
Asset backed securities	1,589,548		1,700,445		2,692,091		2,697,367
Total	$	18,120,727	$	19,913,055	$	17,998,109	$	17,973,823

Summary of other investments and other investable assets

The following table summarizes the Company’s other investments and other investable assets:

	September 30, 2022		December 31, 2021
Fixed maturities	$	530,303	$	416,698
Other investments	1,005,929		1,432,553
Short-term investments	28,614		97,806
Equity securities	13,905		26,493
Total	$	1,578,751	$	1,973,550

The following table summarizes the Company’s other investments, as detailed in the previous table, by strategy:

	September 30, 2022		December 31, 2021
Lending	$	398,789	$	536,345
Investment grade fixed income	229,262		147,810
Term loan investments	151,649		484,950
Private equity	117,856		91,126
Energy	55,250		81,692
Credit related funds	53,123		70,278
Infrastructure	—		20,352
Total	$	1,005,929	$	1,432,553

Summary of investments accounted for using equity method

The following table summarizes the Company’s investments accounted for using the equity method, by strategy:

	September 30, 2022		December 31, 2021
Credit related funds	$	1,135,623	$	1,022,334
Private equity	761,997		436,042
Real estate	474,666		396,395
Lending	454,196		376,649
Equities	261,650		395,090
Infrastructure	236,920		230,070
Energy	113,778		119,141
Fixed income	127,116		101,890
Total	$	3,565,946	$	3,077,611

Summary of investments in limited partnership interests where the Company has a variable interest

The following table summarizes investments in limited partnership interests where the Company has a variable interest by balance sheet line item:

	September 30, 2022		December 31, 2021
Investments accounted for using the equity method (1)	$	3,565,946	$	3,077,611
Investments accounted for using the fair value option (2)	120,498		170,595
Total	$	3,686,444	$	3,248,206

(1)    Aggregate unfunded commitments were $2.8 billion at September 30, 2022, compared to $2.6 billion at December 31, 2021.

(2)    Aggregate unfunded commitments were $21.5 million at September 30, 2022, compared to $18.8 million at December 31, 2021.

Components of net investment income

The components of net investment income were derived from the following sources:

	September 30,
	2022		2021
Three Months Ended
Fixed maturities	$	123,568	$	75,964
Term loans	88		1,736
Equity securities	4,261		9,867
Short-term investments	9,304		1,858
Other (1)	8,556		17,378
Gross investment income	145,777		106,803
Investment expenses	(17,137)		(18,608)
Net investment income	$	128,640	$	88,195
Nine Months Ended
Fixed maturities	$	310,963	$	255,215
Term loans	2,106		33,343
Equity securities	16,620		24,101
Short-term investments	15,999		3,603
Other (1)	26,598		51,683
Gross investment income	372,286		367,945
Investment expenses	(56,818)		(69,281)
Net investment income	$	315,468	$	298,664

(1)    Includes income distributions from investment funds and other items.

Summary of net realized gains (losses), including change in allowance for credit losses on financial assets and net impairment losses recognized in earnings

Net realized gains (losses), which include changes in the allowance for credit losses on financial assets and net impairment losses recognized in earnings were as follows:

	September 30,
	2022		2021
Three Months Ended
Available for sale securities:
Gross gains on investment sales	$	18,030	$	86,819
Gross losses on investment sales	(73,970)		(18,446)
Change in fair value of assets and liabilities accounted for using the fair value option:
Fixed maturities	(19,304)		(7,492)
Other investments	(17,882)		3,811
Equity securities	(584)		3,042
Short-term investments	(975)		16
Equity securities, at fair value:
Net realized gains (losses) on sales during the period	(6,401)		14,736
Net unrealized gains (losses) on equity securities still held at reporting date	(36,162)		(40,155)
Allowance for credit losses:
Investments related	8,652		(456)
Underwriting related	(4,232)		(3,985)
Derivative instruments (1)	(48,196)		(21,435)
Other	(2,649)		(41,495)
Net realized gains (losses)	$	(183,673)	$	(25,040)
Nine Months Ended
Available for sale securities:
Gross gains on investment sales	$	52,923	$	267,362
Gross losses on investment sales	(239,493)		(132,071)
Change in fair value of assets and liabilities accounted for using the fair value option:
Fixed maturities	(89,148)		19,973
Other investments	(35,203)		111,550
Equity securities	(6,021)		10,599
Short-term investments	(3,132)		648
Equity securities, at fair value:
Net realized gains (losses) on sales during the period	75,689		86,155
Net unrealized gains (losses) on equity securities still held at reporting date	(318,732)		45,400
Allowance for credit losses:
Investments related	(48,096)		(1,208)
Underwriting related	(7,676)		2,664
Derivative instruments (1)	(117,591)		(36,428)
Other	(6,186)		(54,316)
Net realized gains (losses)	$	(742,666)	$	320,328

(1)    See note 9 for information on the Company’s derivative instruments.

Rollforward of the allowance for expected credit losses of securities classified as available for sale

The following table provides a roll forward of the allowance for expected credit losses of the Company’s securities classified as available for sale:

	Structured Securities (1)		Municipal Bonds		Corporate Bonds		Total
Three Months Ended September 30, 2022
Balance at beginning of period	$	18,283	$	298	$	39,829	$	58,410
Additions for current-period provision for expected credit losses	1,782		12		1,986		3,780
Additions (reductions) for previously recognized expected credit losses	(9,767)		(211)		(2,552)		(12,530)
Reductions due to disposals	(1,780)		—		(1,887)		(3,667)
Balance at end of period	$	8,518	$	99	$	37,376	$	45,993
Three Months Ended September 30, 2021
Balance at beginning of period	$	759	$	6	$	1,359	$	2,124
Additions for current-period provision for expected credit losses	48		—		—		48
Additions (reductions) for previously recognized expected credit losses	14		(4)		395		405
Reductions due to disposals	(234)		—		(232)		(466)
Balance at end of period	$	587	$	2	$	1,522	$	2,111
Nine Months Ended September 30, 2022
Balance at beginning of period	$	802	$	2	$	2,079	$	2,883
Additions for current-period provision for expected credit losses	12,560		359		40,602		53,521
Additions (reductions) for previously recognized expected credit losses	(2,575)		(262)		(2,772)		(5,609)
Reductions due to disposals	(2,269)		—		(2,533)		(4,802)
Balance at end of period	$	8,518	$	99	$	37,376	$	45,993
Nine Months Ended September 30, 2021
Balance at beginning of period	$	1,490	$	11	$	896	$	2,397
Additions for current-period provision for expected credit losses	282		—		2,428		2,710
Additions (reductions) for previously recognized expected credit losses	(751)		(9)		(557)		(1,317)
Reductions due to disposals	(434)		—		(1,245)		(1,679)
Balance at end of period	$	587	$	2	$	1,522	$	2,111

(1)    Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.

Summary of restricted assets

The following table details the value of the Company’s restricted assets:

	September 30, 2022		December 31, 2021
Assets used for collateral or guarantees:
Affiliated transactions	$	4,212,521	$	4,223,955
Third party agreements	2,847,814		2,721,160
Deposits with U.S. regulatory authorities	756,368		798,100
Deposits with non-U.S. regulatory authorities	519,254		506,517
Total restricted assets	$	8,335,957	$	8,249,732

Reconciliation of cash and restricted cash

The following table details reconciliation of cash and restricted cash within the Consolidated Balance Sheets:

	September 30, 2022		December 31, 2021
Cash	$	813,583	$	858,668
Restricted cash (included in ‘other assets’)	444,741		456,103
Cash and restricted cash	$	1,258,324	$	1,314,771

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Fair Value (Tables)

9 Months Ended

Sep. 30, 2022

Fair Value Disclosures [Abstract]

Fair value hierarchy

The following table presents the Company’s financial assets and liabilities measured at fair value by level at September 30, 2022:

			Estimated Fair Value Measurements Using:
	Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets measured at fair value:
Available for sale securities:
Fixed maturities:
Corporate bonds	$	7,096,269	$	—	$	7,096,256	$	13
Residential mortgage backed securities	763,371		—		763,371		—
Municipal bonds	407,724		—		407,724		—
Commercial mortgage backed securities	1,064,238		—		1,064,238		—
U.S. government and government agencies	5,126,407		5,100,908		25,499		—
Non-U.S. government securities	2,073,170		—		2,073,170		—
Asset backed securities	1,589,548		—		1,589,548		—
Total	18,120,727		5,100,908		13,019,806		13
Short-term investments	1,940,857		1,873,480		67,377		—
Equity securities, at fair value	809,869		775,264		31,566		3,039
Derivative instruments (2)	176,160		—		176,160		—
Residential mortgage loans	2,255		—		2,255		—
Fair value option:
Corporate bonds	524,177		—		524,177		—
Non-U.S. government bonds	4,032		—		4,032		—
Asset backed securities	2,094		—		2,094		—
Short-term investments	28,614		405		28,209		—
Equity securities	13,905		9,312		1		4,592
Other investments	175,259		—		141,021		34,238
Other investments measured at net asset value (1)	830,670
Total	1,578,751		9,717		699,534		38,830
Total assets measured at fair value	$	22,628,619	$	7,759,369	$	13,996,698	$	41,882
Liabilities measured at fair value:
Other liabilities	$	(13,421)	$	—	$	—	$	(13,421)
Derivative instruments (2)	(112,577)		—		(112,577)		—
Total liabilities measured at fair value	$	(125,998)	$	—	$	(112,577)	$	(13,421)

(1)    In accordance with applicable accounting guidance, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.

(2)    See note 9.

The following table presents the Company’s financial assets and liabilities measured at fair value by level at December 31, 2021:

			Estimated Fair Value Measurements Using:
	Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets measured at fair value:
Available for sale securities:
Fixed maturities:
Corporate bonds	$	6,553,333	$	—	$	6,553,320	$	13
Residential mortgage backed securities	408,477		—		408,477		—
Municipal bonds	404,666		—		404,666		—
Commercial mortgage backed securities	1,046,484		—		1,046,484		—
U.S. government and government agencies	4,772,764		4,744,517		28,247		—
Non-U.S. government securities	2,120,294		—		2,120,294		—
Asset backed securities	2,692,091		—		2,688,744		3,347
Total	17,998,109		4,744,517		13,250,232		3,360
Short-term investments	1,734,716		1,052,822		681,894		—
Equity securities, at fair value	1,804,170		1,762,864		38,388		2,918
Derivative instruments (2)	127,121		—		127,121		—
Residential mortgage loans	49,847		—		49,847		—
Fair value option:
Corporate bonds	388,546		—		388,546		—
Non-U.S. government bonds	23,785		—		23,785		—
Asset backed securities	4,367		—		4,367		—
Short-term investments	97,806		528		97,278		—
Equity securities	26,493		21,745		—		4,748
Other investments	310,798		20,352		262,465		27,981
Other investments measured at net asset value (1)	1,121,755
Total	1,973,550		42,625		776,441		32,729
Total assets measured at fair value	$	23,687,513	$	7,602,828	$	14,923,923	$	39,007
Liabilities measured at fair value:
Other liabilities	$	(16,960)	$	—	$	—	$	(16,960)
Derivative instruments (2)	(54,224)		—		(54,224)		—
Total liabilities measured at fair value	$	(71,184)	$	—	$	(54,224)	$	(16,960)

(1)    In accordance with applicable accounting guidance, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.

(2)    See note 9.

Rollforward of Level 3 investments

The following table presents a reconciliation of the beginning and ending balances for all financial assets and liabilities measured at fair value on a recurring basis using Level 3 inputs:

	Assets												Liabilities
s	Available For Sale				Fair Value Option						Fair Value
	Structured Securities (1)		Corporate Bonds		Corporate Bonds		Other Investments		Equity Securities		Equity Securities		Other Liabilities
Three Months Ended September 30, 2022
Balance at beginning of period	$	2,867	$	3,570	$	—	$	33,331	$	4,392	$	2,906	$	(16,205)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)	(601)		52		—		116		200		133		(89)
Included in other comprehensive income	144		(59)		—		—		—		—		965
Purchases, issuances, sales and settlements
Purchases	—		—		—		1,458		—		—		—
Issuances	—		—		—		—		—		—		—
Sales	(2,051)		(3,550)		—		(667)		—		—		—
Settlements	(359)		—		—		—		—		—		1,908
Transfers in and/or out of Level 3	—		—		—		—		—		—		—
Balance at end of period	$	—	$	13	$	—	$	34,238	$	4,592	$	3,039	$	(13,421)
Three Months Ended September 30, 2021
Balance at beginning of period	$	3,424	$	13	$	998	$	73,900	$	73,678	$	49,136	$	(466)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)	10		—		—		—		38		11		—
Included in other comprehensive income	10		—		—		—		—		—		—
Purchases, issuances, sales and settlements
Purchases	—		—		—		—		—		208		(17,345)
Issuances	—		—		—		—		—		—		—
Sales (3)	—		—		(998)		(44,143)		(69,181)		(46,773)		—
Settlements	—		—		—		—		—		—		—
Transfers in and/or out of Level 3	—		—		—		—		—		—		—
Balance at end of period	$	3,444	$	13	$	—	$	29,757	$	4,535	$	2,582	$	(17,811)
Nine Months Ended September 30, 2022
Balance at beginning of year	$	3,347	$	13	$	—	$	27,981	$	4,748	$	2,918	$	(16,960)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)	(592)		52		—		150		(156)		(103)		(284)
Included in other comprehensive income	(1)		(59)		—		—		—		—		1,915
Purchases, issuances, sales and settlements
Purchases	—		—		—		12,228		—		227		—
Issuances	—		—		—		—		—		—		—
Sales	(2,051)		(3,550)		—		(3,138)		—		(3)		—
Settlements	(703)		—		—		(2,983)		—		—		1,908
Transfers in and/or out of Level 3	—		3,557		—		—		—		—		—
Balance at end of period	$	—	$	13	$	—	$	34,238	$	4,592	$	3,039	$	(13,421)
Nine Months Ended September 30, 2021
Balance at beginning of year	$	3,426	$	13	$	985	$	67,103	$	68,988	$	42,015	$	(461)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)	(46)		—		13		881		4,728		1,837		—
Included in other comprehensive income	67		—		—		—		—		—		—
Purchases, issuances, sales and settlements
Purchases	—		—		—		13,003		—		5,503		(17,345)
Issuances	—		—		—		—		—		—		—
Sales (3)	—		—		(998)		(51,230)		(69,181)		(46,773)		—
Settlements	(3)		—		—		—		—		—		(5)
Transfers in and/or out of Level 3	—		—		—		—		—		—		—
Balance at end of period	$	3,444	$	13	$	—	$	29,757	$	4,535	$	2,582	$	(17,811)

(1)    Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.

(2)    Gains or losses were included in net realized gains (losses).

(3)    Sales for the 2021 periods primarily related to the Company’s deconsolidation of Somers..

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Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2022

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair value and notional amount of derivatives

The following table summarizes information on the fair values and notional values of the Company’s derivative instruments:

	Estimated Fair Value
	Asset Derivatives (1)		Liability Derivatives (1)		Notional Value (2)
September 30, 2022
Futures contracts	$	72,730	$	(60,684)	$	2,189,945
Foreign currency forward contracts	25,281		(26,995)		835,941
TBAs	—		—		—
Other	78,149		(24,898)		3,766,549
Total	$	176,160	$	(112,577)
December 31, 2021
Futures contracts	$	34,999	$	(9,808)	$	2,826,564
Foreign currency forward contracts	7,734		(11,390)		915,962
TBAs	11,227		—		11,227
Other	73,161		(33,026)		3,736,773
Total	$	127,121	$	(54,224)

(1)    The fair value of asset derivatives are included in ‘other assets’ and the fair value of liability derivatives are included in ‘other liabilities.’

(2)    Represents the absolute notional value of all outstanding contracts, consisting of long and short positions.

Summary of net realized gains (losses) recorded in the consolidated statements of income

Realized and unrealized contract gains and losses on the Company’s derivative instruments are reflected in ‘net realized gains (losses)’ in the consolidated statements of income, as summarized in the following table:

Derivatives not designated as	September 30,
hedging instruments:	2022		2021
Three Months Ended
Net realized gains (losses):
Futures contracts	$	(26,347)	$	(10,073)
Foreign currency forward contracts	(18,340)		(16,146)
TBAs	—		(46)
Other (1)	(3,509)		4,830
Total	$	(48,196)	$	(21,435)
Nine Months Ended
Net realized gains (losses):
Futures contracts	$	(112,326)	$	(17,394)
Foreign currency forward contracts	(46,016)		(36,922)
TBAs	(51)		(46)
Other (1)	40,802		17,934
Total	$	(117,591)	$	(36,428)

(1)    Includes realized gains and losses on swaps, options and other derivatives contracts.

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Variable Interest Entities and Noncontrolling Interests (Tables)

9 Months Ended

Sep. 30, 2022

Noncontrolling Interest [Abstract]

Activity in redeemable noncontrolling interests

The following table sets forth activity in the redeemable non-controlling interests:

	September 30,
	2022		2021
Three Months Ended
Balance, beginning of period	$	8,459	$	57,533
Impact of deconsolidation of Somers	—		(48,919)
Other	449		1,623
Balance, end of period	$	8,908	$	10,237
Nine Months Ended
Balance, beginning of year	$	9,233	$	58,548
Impact of deconsolidation of Somers	—		(48,919)
Other	(325)		608
Balance, end of period	$	8,908	$	10,237

Portion of income or loss attributable to third party investors

The portion of income or loss attributable to third party investors, recorded in the Company’s consolidated statements of income in ‘net (income) loss attributable to noncontrolling interests,’ are summarized in the table below:

	September 30,
	2022		2021
Three Months Ended
Amounts attributable to non-redeemable noncontrolling interests	$	—	$	—
Amounts attributable to redeemable noncontrolling interests	(1,157)		(1,473)
Net (income) loss attributable to noncontrolling interests	$	(1,157)	$	(1,473)
Nine Months Ended
Amounts attributable to non-redeemable noncontrolling interests	$	—	$	(78,314)
Amounts attributable to redeemable noncontrolling interests	(2,390)		(3,889)
Net (income) loss attributable to noncontrolling interests	$	(2,390)	$	(82,203)

Total assets and maximum exposure to loss associated with VIEs

The following table presents the total assets of the Bellemeade entities, as well as the Company’s maximum exposure to loss associated with these VIEs, calculated as the maximum historical observable spread between the benchmark index for each respective transaction and short term invested trust asset yields. The benchmark index for agreements effective prior to 2021 is based on one-month LIBOR, while the 2021 and later agreements benchmark index is based on the Secured Overnight Financing Rate (“SOFR”). SOFR is a measure of the cost of borrowing cash overnight, collateralized by U.S. Treasury securities, and is based on directly observable U.S. Treasury-backed repurchase transactions.

			September 30, 2022										December 31, 2021
			Maximum Exposure to Loss										Maximum Exposure to Loss
Bellemeade Entities (Issue Date)	Total VIE Assets		On-Balance Sheet (Asset) Liability		Off-Balance Sheet		Total		Coverage Remaining from Reinsurers (1)		Total VIE Assets		On-Balance Sheet (Asset) Liability		Off-Balance Sheet		Total
2017-1 Ltd. (Oct-17)	$	46,772	$	(23)	$	88	$	65	$	—	$	108,368	$	(159)	$	424	$	265
2018-1 Ltd. (Apr-18)	103,131		(220)		644		424		—		181,136		(528)		1,268		740
2018-3 Ltd. (Oct-18)	217,701		(862)		2,107		1,245		—		302,563		(1,018)		2,496		1,478
2019-1 Ltd. (Mar-19)	119,193		(496)		2,704		2,208		—		181,324		(380)		5,807		5,427
2019-2 Ltd. (Apr-19)	347,050		(656)		4,308		3,652		—		398,316		(515)		3,998		3,483
2019-3 Ltd. (Jul-19)	257,663		(192)		1,492		1,300		—		409,859		(584)		3,190		2,606
2019-4 Ltd. (Oct-19)	283,684		(532)		3,663		3,131		—		411,954		(462)		4,759		4,297
2020-2 Ltd. (Sep-20)	122,897		(20)		595		575		153		217,766		(177)		1,984		1,807
2020-3 Ltd. (Nov-20)	268,385		(204)		2,845		2,641		8,569		348,818		(128)		5,793		5,665
2020-4 Ltd. (Dec-20)	107,396		10		707		717		4,795		176,826		(50)		1,630		1,580
2021-1 Ltd. (Mar-21)	497,069		(2,234)		936		(1,298)		43,198		568,986		(303)		3,283		2,980
2021-2 Ltd. (Jun-21)	471,039		(2,047)		984		(1,063)		80,268		522,807		281		4,124		4,405
2021-3 Ltd. (Sep-21)	498,309		(2,414)		991		(1,423)		129,127		507,873		(411)		3,446		3,035
2022-1 Ltd. (Jan-22)	283,500		(1,326)		627		(699)		33,260
2022-2 Ltd. (Sep-22)	201,005		—		744		744		126,160
Total	$	3,824,794	$	(11,216)	$	23,435	$	12,219	$	425,530	$	4,336,596	$	(4,434)	$	42,202	$	37,768

(1) Coverage from a separate panel of reinsurers remaining at September 30, 2022.

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Other Comprehensive Income (Loss) (Tables)

9 Months Ended

Sep. 30, 2022

Comprehensive Income Note Disclosure [Abstract]

Details about amounts reclassified from AOCI

The following tables present details about amounts reclassified from accumulated other comprehensive income and the tax effects allocated to each component of other comprehensive income (loss):

		Amounts Reclassified from AOCI
	Consolidated Statement of Income	Three Months Ended				Nine Months Ended
Details About	Line Item That Includes	September 30,				September 30,
AOCI Components	Reclassification	2022		2021		2022		2021
Unrealized appreciation (decline) on available-for-sale investments
	Net realized gains (losses)	$	(55,940)	$	68,373	$	(186,570)	$	135,291
	Provision for credit losses	8,652		(457)		(48,096)		(1,208)
	Total before tax	(47,288)		67,916		(234,666)		134,083
	Income tax (expense) benefit	703		(5,262)		28,093		(13,579)
	Net of tax	$	(46,585)	$	62,654	$	(206,573)	$	120,504

Schedule of comprehensive income (loss)

	Before Tax Amount		Tax Expense (Benefit)		Net of Tax Amount
Three Months Ended September 30, 2022
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains (losses) arising during period	$	(671,907)	$	(62,148)	$	(609,759)
Less reclassification of net realized gains (losses) included in net income	(47,288)		(703)		(46,585)
Foreign currency translation adjustments	(70,388)		—		(70,388)
Other comprehensive income (loss)	$	(695,007)	$	(61,445)	$	(633,562)
Three Months Ended September 30, 2021
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains (losses) arising during period	$	(104,607)	$	(8,684)	$	(95,923)
Less reclassification of net realized gains (losses) included in net income	67,916		5,262		62,654
Foreign currency translation adjustments	(32,060)		(350)		(31,710)
Other comprehensive income (loss)	$	(204,583)	$	(14,296)	$	(190,287)
Nine Months Ended September 30, 2022
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains (losses) arising during period	$	(2,132,845)	$	(240,726)	$	(1,892,119)
Less reclassification of net realized gains (losses) included in net income	(234,666)		(28,093)		(206,573)
Foreign currency translation adjustments	(141,515)		166		(141,681)
Other comprehensive income (loss)	$	(2,039,694)	$	(212,467)	$	(1,827,227)
Nine Months Ended September 30, 2021
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains (losses) arising during period	$	(307,910)	$	(28,808)	$	(279,102)
Less reclassification of net realized gains (losses) included in net income	134,083		13,579		120,504
Foreign currency translation adjustments	(54,083)		6		(54,089)
Other comprehensive income (loss)	$	(496,076)	$	(42,381)	$	(453,695)

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Basis of Presentation and Recent Accounting Pronouncements (Details) - Greysbridge Holdings Ltd	Jul. 01, 2021
Schedule of Equity Method Investments [Line Items]
Percentage ownership	40.00%
Warburg Pincus LLC
Schedule of Equity Method Investments [Line Items]
Percentage ownership	30.00%
Kelso And Company
Schedule of Equity Method Investments [Line Items]
Percentage ownership	30.00%

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Share Transactions - Share repurchases (Details) - Common shares shares in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) shares
Class of Stock [Line Items]
Cumulative number of shares acquired since inception of share repurchase program | shares	433.6
Aggregate purchase price of shares acquired since inception of share repurchase program	$ 5,870.0
Treasury stock, shares acquired (shares) | shares	12.9
Shares repurchased for treasury	$ 585.8
Remaining authorized repurchase amount	$ 596.4

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Share Transactions - Long-Term Incentive and Share Award Plan (Details) - 2022 Long-term incentive and share award plan - shares	Sep. 30, 2022	May 04, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)		9,000,000
Number of shares available for future issuance (in shares)	9,000,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)		6,000,000

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Share Transactions - Issuance of preferred shares (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	1 Months Ended		9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Class of Stock [Line Items]
Proceeds from issuance of preferred shares, net			$ 0	$ 485,821
Series G Preferred Shares
Class of Stock [Line Items]
Preferred shares issued		$ 500,000
Preferred shares, dividend rate (as a percent)		4.55%
Preferred shares, par value per share	$ 0.01			$ 0.01
Liquidation preference per share	25,000			25,000
Preferred shares, redemption price per share	25,000			25,000
Proceeds from issuance of preferred shares, net		$ 485,800
Series G Depositary Share Equivalent
Class of Stock [Line Items]
Preferred shares issued		$ 500,000
Preference shares, number of shares issued		20.0
Liquidation preference per share	25			25
Preferred shares, redemption price per share	$ 25			$ 25
Proportionate interest of preference shares (per depositary share)	0.10%			0.10%
Series E Preferred Shares
Class of Stock [Line Items]
Preferred shares, dividend rate (as a percent)	5.25%
Series E Depositary Share Equivalent
Class of Stock [Line Items]
Preferred shares, redemption price per share	$ 25			$ 25

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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net income (loss)		$ 18,258	$ 421,415	$ 619,635	$ 1,615,787
Amounts attributable to noncontrolling interests		(1,157)	(1,473)	(2,390)	(82,203)
Net income available to Arch		17,101	419,942	617,245	1,533,584
Preferred dividends		(10,184)	(16,090)	(30,552)	(38,159)
Loss on redemption of preferred shares		0	(15,101)	0	(15,101)
Net income (loss) available to Arch common shareholders		$ 6,917	$ 388,751	$ 586,693	$ 1,480,324
Denominator:
Weighted average common shares outstanding — basic		365,190,527	389,274,220	369,525,348	395,899,591
Effect of dilutive common share equivalents:
Nonvested restricted shares		2,351,039	2,131,915	2,171,158	1,877,930
Stock options	[1]	6,185,711	6,497,212	6,676,674	6,482,964
Weighted average common shares and common share equivalents outstanding — diluted		373,727,277	397,903,347	378,373,180	404,260,485
Earnings per common share:
Basic (per share)		$ 0.02	$ 1.00	$ 1.59	$ 3.74
Diluted (per share)		$ 0.02	$ 0.98	$ 1.55	$ 3.66
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per common share (shares)		774,481	1,948,006	785,682	2,397,507

[1] Certain stock options were not included in the computation of diluted earnings per share where the exercise price of the stock options exceeded the average market price and would have been anti-dilutive or where, when applying the treasury stock method to in-the-money options, the sum of the proceeds, including unrecognized compensation, exceeded the average market price and would have been anti-dilutive. For the 2022 third quarter and 2021 third quarter, the number of stock options excluded were 774,481 and 1,948,006, respectively. For the nine months ended September 30, 2022 and 2021, the number of stock options excluded were 785,682 and 2,397,507, respectively.

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Segment Information - Summary of underwriting income or loss by segment (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segment	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Gross premiums written		$ 3,860,683	$ 3,207,415	$ 11,531,185	$ 9,890,912
Premiums ceded		(1,136,909)	(1,131,486)	(3,488,632)	(2,907,002)
Net premiums written		2,723,774	2,075,929	8,042,553	6,983,910
Change in unearned premiums		(253,024)	(146,592)	(1,125,395)	(985,242)
Net premiums earned		2,470,750	1,929,337	6,917,158	5,998,668
Other underwriting income (loss)		3,077	7,274	11,944	18,913
Losses and loss adjustment expenses		(1,682,696)	(1,226,019)	(3,786,187)	(3,588,950)
Acquisition expenses		(447,587)	(306,015)	(1,239,065)	(945,639)
Other operating expenses		(274,747)	(230,832)	(842,082)	(736,808)
Underwriting income (loss)		68,797	173,745	1,061,768	746,184
Net investment income		128,640	88,195	315,468	298,664
Net realized gains (losses)		(183,673)	(25,040)	(742,666)	320,328
Equity in net income (loss) of investment funds accounted for using the equity method		(18,861)	105,398	75,505	299,270
Other income (loss)		(13,684)	(3,960)	(34,486)	1,151
Corporate expenses		(17,634)	(18,636)	(76,928)	(59,279)
Transaction costs and other		(76)	(1,036)	(734)	(1,728)
Amortization of intangible assets		(26,104)	(20,135)	(80,478)	(49,823)
Interest expense		(33,063)	(33,176)	(98,566)	(107,222)
Net foreign exchange gains (losses)		90,509	36,078	182,129	38,366
Income (loss) before income taxes and income (loss) from operating affiliates		(5,149)	301,433	601,012	1,485,911
Income tax expense (benefit)		14,900	(4,137)	(19,042)	(94,176)
Income (loss) from operating affiliates		8,507	124,119	37,665	224,052
Net income (loss)		18,258	421,415	619,635	1,615,787
Amounts attributable to redeemable noncontrolling interests		(1,157)	(1,473)	(2,390)	(3,889)
Amounts attributable to non-redeemable noncontrolling interests		0	0	0	(78,314)
Net income (loss) available to Arch		17,101	419,942	617,245	1,533,584
Preferred dividends		(10,184)	(16,090)	(30,552)	(38,159)
Loss on redemption of preferred shares		0	(15,101)	0	(15,101)
Net income (loss) available to Arch common shareholders		$ 6,917	$ 388,751	$ 586,693	$ 1,480,324
Underwriting Ratios
Loss ratio		68.10%	63.50%	54.70%	59.80%
Acquisition expense ratio		18.10%	15.90%	17.90%	15.80%
Other operating expense ratio		11.10%	12.00%	12.20%	12.30%
Combined ratio		97.30%	91.40%	84.80%	87.90%
Goodwill and intangible assets		$ 806,655	$ 963,322	$ 806,655	$ 963,322	$ 944,983
Operating segments | Underwriting Segments
Segment Reporting Information [Line Items]
Number of segments | segment				3
Gross premiums written	[1]	3,860,683	3,207,415	$ 11,531,185	9,602,213
Premiums ceded		(1,136,909)	(1,131,486)	(3,488,632)	(2,973,005)
Net premiums written		2,723,774	2,075,929	8,042,553	6,629,208
Change in unearned premiums		(253,024)	(146,592)	(1,125,395)	(962,508)
Net premiums earned		2,470,750	1,929,337	6,917,158	5,666,700
Other underwriting income (loss)		3,077	7,274	11,944	18,174
Losses and loss adjustment expenses		(1,682,696)	(1,226,019)	(3,786,187)	(3,329,908)
Acquisition expenses		(447,587)	(306,015)	(1,239,065)	(882,898)
Other operating expenses		(274,747)	(230,832)	(842,082)	(703,939)
Underwriting income (loss)		68,797	173,745	1,061,768	768,129
Net investment income		128,640	88,195	315,468	256,354
Net realized gains (losses)		(183,673)	(25,040)	(742,666)	239,690
Equity in net income (loss) of investment funds accounted for using the equity method		(18,861)	105,398	75,505	299,270
Other income (loss)		(13,684)	(3,960)	(34,486)	1,151
Corporate expenses	[2]	(17,634)	(18,636)	(76,928)	(59,279)
Transaction costs and other	[2]	(76)	(1,036)	(734)	(793)
Amortization of intangible assets		(26,104)	(20,135)	(80,478)	(48,925)
Interest expense		(33,063)	(33,176)	(98,566)	(98,812)
Net foreign exchange gains (losses)		90,509	36,078	182,129	39,691
Income (loss) before income taxes and income (loss) from operating affiliates		(5,149)	301,433	601,012	1,396,476
Income tax expense (benefit)		14,900	(4,137)	(19,042)	(93,942)
Income (loss) from operating affiliates		8,507	124,119	37,665	224,052
Net income (loss)		18,258	421,415	619,635	1,526,586
Amounts attributable to redeemable noncontrolling interests		(1,157)	(1,473)	(2,390)	(1,936)
Amounts attributable to non-redeemable noncontrolling interests					0
Net income (loss) available to Arch		17,101	419,942	617,245	1,524,650
Preferred dividends		(10,184)	(16,090)	(30,552)	(38,159)
Loss on redemption of preferred shares			(15,101)		(15,101)
Net income (loss) available to Arch common shareholders		$ 6,917	$ 388,751	$ 586,693	$ 1,471,390
Underwriting Ratios
Loss ratio		68.10%	63.50%	54.70%	58.80%
Acquisition expense ratio		18.10%	15.90%	17.90%	15.60%
Other operating expense ratio		11.10%	12.00%	12.20%	12.40%
Combined ratio		97.30%	91.40%	84.80%	86.80%
Goodwill and intangible assets		$ 806,655	$ 963,322	$ 806,655	$ 963,322
Operating segments | Insurance
Segment Reporting Information [Line Items]
Gross premiums written	[1]	1,862,026	1,596,619	5,286,798	4,381,372
Premiums ceded		(493,267)	(442,806)	(1,482,886)	(1,269,165)
Net premiums written		1,368,759	1,153,813	3,803,912	3,112,207
Change in unearned premiums		(181,851)	(215,143)	(488,164)	(488,636)
Net premiums earned		1,186,908	938,670	3,315,748	2,623,571
Other underwriting income (loss)		0	0	0	0
Losses and loss adjustment expenses		(822,663)	(668,630)	(2,053,161)	(1,750,257)
Acquisition expenses		(232,469)	(152,467)	(641,807)	(417,541)
Other operating expenses		(165,499)	(138,931)	(493,412)	(409,386)
Underwriting income (loss)		$ (33,723)	$ (21,358)	$ 127,368	$ 46,387
Underwriting Ratios
Loss ratio		69.30%	71.20%	61.90%	66.70%
Acquisition expense ratio		19.60%	16.20%	19.40%	15.90%
Other operating expense ratio		13.90%	14.80%	14.90%	15.60%
Combined ratio		102.80%	102.20%	96.20%	98.20%
Goodwill and intangible assets		$ 224,525	$ 261,103	$ 224,525	$ 261,103
Operating segments | Reinsurance
Segment Reporting Information [Line Items]
Gross premiums written	[1]	1,639,061	1,251,760	5,151,401	4,080,840
Premiums ceded		(560,225)	(630,371)	(1,770,807)	(1,535,607)
Net premiums written		1,078,836	621,389	3,380,594	2,545,233
Change in unearned premiums		(77,062)	57,313	(646,421)	(484,607)
Net premiums earned		1,001,774	678,702	2,734,173	2,060,626
Other underwriting income (loss)		452	3,293	5,814	3,148
Losses and loss adjustment expenses		(927,911)	(545,846)	(1,920,189)	(1,494,539)
Acquisition expenses		(208,425)	(129,450)	(569,915)	(381,060)
Other operating expenses		(62,777)	(45,647)	(198,606)	(150,856)
Underwriting income (loss)		$ (196,887)	$ (38,948)	$ 51,277	$ 37,319
Underwriting Ratios
Loss ratio		92.60%	80.40%	70.20%	72.50%
Acquisition expense ratio		20.80%	19.10%	20.80%	18.50%
Other operating expense ratio		6.30%	6.70%	7.30%	7.30%
Combined ratio		119.70%	106.20%	98.30%	98.30%
Goodwill and intangible assets		$ 140,800	$ 176,128	$ 140,800	$ 176,128
Operating segments | Mortgage
Segment Reporting Information [Line Items]
Gross premiums written	[1]	362,409	360,934	1,099,144	1,143,691
Premiums ceded		(86,230)	(60,207)	(241,097)	(171,923)
Net premiums written		276,179	300,727	858,047	971,768
Change in unearned premiums		5,889	11,238	9,190	10,735
Net premiums earned		282,068	311,965	867,237	982,503
Other underwriting income (loss)		2,625	3,981	6,130	15,026
Losses and loss adjustment expenses		67,878	(11,543)	187,163	(85,112)
Acquisition expenses		(6,693)	(24,098)	(27,343)	(84,297)
Other operating expenses		(46,471)	(46,254)	(150,064)	(143,697)
Underwriting income (loss)		$ 299,407	$ 234,051	$ 883,123	$ 684,423
Underwriting Ratios
Loss ratio		(24.10%)	3.70%	(21.60%)	8.70%
Acquisition expense ratio		2.40%	7.70%	3.20%	8.60%
Other operating expense ratio		16.50%	14.80%	17.30%	14.60%
Combined ratio		(5.20%)	26.20%	(1.10%)	31.90%
Goodwill and intangible assets		$ 441,330	$ 526,091	$ 441,330	$ 526,091
Operating segments | Corporate and Other Segments
Segment Reporting Information [Line Items]
Number of segments | segment				2
Gross premiums written	[1]	0	0	$ 0	457,465
Premiums ceded		0	0	0	(102,763)
Net premiums written		0	0	0	354,702
Change in unearned premiums		0	0	0	(22,734)
Net premiums earned		0	0	0	331,968
Other underwriting income (loss)		0	0	0	739
Losses and loss adjustment expenses		0	0	0	(259,042)
Acquisition expenses		0	0	0	(62,741)
Other operating expenses		0	0	0	(32,869)
Underwriting income (loss)		0	0	0	(21,945)
Net investment income		0	0	0	42,310
Net realized gains (losses)		0	0	0	80,638
Equity in net income (loss) of investment funds accounted for using the equity method		0	0	0	0
Other income (loss)		0	0	0	0
Corporate expenses	[2]	0	0	0	0
Transaction costs and other	[2]	0	0	0	(935)
Amortization of intangible assets		0	0	0	(898)
Interest expense		0	0	0	(8,410)
Net foreign exchange gains (losses)		0	0	0	(1,325)
Income (loss) before income taxes and income (loss) from operating affiliates		0	0	0	89,435
Income tax expense (benefit)		0	0	0	(234)
Income (loss) from operating affiliates		0	0	0	0
Net income (loss)		0	0	0	89,201
Amounts attributable to redeemable noncontrolling interests		0	0	0	(1,953)
Amounts attributable to non-redeemable noncontrolling interests					(78,314)
Net income (loss) available to Arch		0	0	0	8,934
Preferred dividends		0	0	0	0
Loss on redemption of preferred shares			0		0
Net income (loss) available to Arch common shareholders		$ 0	$ 0	$ 0	$ 8,934
Underwriting Ratios
Loss ratio		0.00%	0.00%	0.00%	78.00%
Acquisition expense ratio		0.00%	0.00%	0.00%	18.90%
Other operating expense ratio		0.00%	0.00%	0.00%	9.90%
Combined ratio		0.00%	0.00%	0.00%	106.80%
Goodwill and intangible assets		$ 0	$ 0	$ 0	$ 0

[1] Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

[2] Certain expenses have been excluded from ‘corporate expenses’ and reflected in ‘transaction costs and other.’

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Reserve for Losses and Loss Adjustment Expenses - Reconciliation of beginning and ending balances of losses and loss adjustment reserves (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]
Reserve for losses and loss adjustment expenses at beginning of period		$ 18,194,324	$ 17,196,648	$ 17,757,156	$ 16,513,929
Unpaid losses and loss adjustment expenses recoverable		5,686,348	4,146,020	5,599,231	4,314,855
Net reserve for losses and loss adjustment expenses at beginning of period		12,507,976	13,050,628	12,157,925	12,199,074
Net incurred losses and loss adjustment expenses relating to losses occurring in:
Current year		1,863,519	1,348,528	4,280,048	3,812,381
Prior years		(180,823)	(122,509)	(493,861)	(223,431)
Total net incurred losses and loss adjustment expenses		1,682,696	1,226,019	3,786,187	3,588,950
Net losses and loss adjustment expense reserves of acquired business	[1]	0	104,307	0	104,307
Retroactive reinsurance transaction	[2]	0	0	0	(183,893)
Impact of deconsolidation of Somers		0	(1,460,611)	0	(1,460,611)
Net foreign exchange (gains) losses and other		(243,387)	(78,152)	(524,682)	10,818
Net paid losses and loss adjustment expenses relating to losses occurring in:
Current year		(226,575)	(208,923)	(463,847)	(432,348)
Prior years		(538,967)	(417,368)	(1,773,840)	(1,610,397)
Total net paid losses and loss adjustment expenses		(765,542)	(626,291)	(2,237,687)	(2,042,745)
Net reserve for losses and loss adjustment expenses at end of period		13,181,743	12,215,900	13,181,743	12,215,900
Unpaid losses and loss adjustment expenses recoverable		6,106,548	5,115,147	6,106,548	5,115,147
Reserve for losses and loss adjustment expenses at end of period		$ 19,288,291	$ 17,331,047	$ 19,288,291	$ 17,331,047

[1] Represents activity related to the Company’s acquisitions in the 2021 period of the Westpac Lenders Mortgage Insurance Limited and Somerset Bridge Group Limited, Southern Rock Holdings Limited and affiliates.

[2] During the 2021 first quarter, the Company entered into a reinsurance to close and other related agreements with Premia Managing Agency Limited (“Premia”), in connection with the 2018 and prior years of account related to the acquisition of Barbican Group Holdings Limited (“Barbican”).

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Reserve for Losses and Loss Adjustment Expenses - Prior year development (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	$ 180,823	$ 122,509	$ 493,861	$ 223,431
Operating segments | Insurance
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	$ 5,400	$ 5,100	$ 19,400	$ 13,100
Percentage of prior year development	0.50%	0.50%	0.60%	0.50%
Operating segments | Insurance | Short tailed lines
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	$ 15,900		$ 49,100	$ 65,300
Operating segments | Insurance | Short tailed lines | Property excluding marine
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	8,900	$ 5,400		27,000
Operating segments | Insurance | Short tailed lines | Travel and accident
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)		5,100	14,300	14,400
Operating segments | Insurance | Short tailed lines | Lenders products
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	5,700	5,400	36,500	24,000
Operating segments | Insurance | Medium tailed lines
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)		(43,900)		(89,400)
Operating segments | Insurance | Medium tailed lines | Programs
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)				(6,900)
Operating segments | Insurance | Medium tailed lines | Professional liability
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	(11,300)		(24,900)	(26,200)
Operating segments | Insurance | Medium tailed lines | Contract binding
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)		(37,000)	(5,500)	(57,100)
Operating segments | Insurance | Medium tailed lines | Marine
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	5,900		11,400
Operating segments | Insurance | Long tailed lines | Casualty
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	(12,300)		(18,000)
Operating segments | Insurance | Long tailed lines | Construction and national accounts
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)		26,300
Operating segments | Insurance | Long tailed lines | Other Lines Of Business
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)		6,700	17,400
Operating segments | Insurance | Long tailed lines | Construction, National Accounts And Alternative Markets
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)				37,100
Operating segments | Insurance | Medium tailed and long tailed lines
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	(10,500)		(29,700)
Operating segments | Insurance | Short Tailed And Long Tailed Lines
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)		49,000		102,500
Operating segments | Reinsurance
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	$ 49,200	$ 72,300	$ 128,100	$ 119,600
Percentage of prior year development	4.90%	10.70%	4.70%	5.80%
Operating segments | Reinsurance | Short tailed lines
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)		$ 65,400		$ 132,600
Operating segments | Reinsurance | Short tailed lines | Property catastrophe and property other than property catastrophe
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)		46,100
Operating segments | Reinsurance | Short tailed lines | Property catastrophe
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	$ 12,700		$ 22,400	(36,300)
Operating segments | Reinsurance | Short tailed lines | Property Other Than Property Catastrophe
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	35,800		83,200	71,700
Operating segments | Reinsurance | Short tailed lines | Other specialty lines
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)		18,900	19,800	97,100
Operating segments | Reinsurance | Medium tailed lines | Marine and aviation
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	7,900		22,700
Operating segments | Reinsurance | Long tailed lines
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	(8,900)		(19,700)	(20,100)
Operating segments | Reinsurance | Long tailed lines | Casualty
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	(9,500)		(19,300)
Operating segments | Reinsurance | Short tailed and medium tailed lines
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	58,100		147,800	139,700
Operating segments | Reinsurance | Medium tailed and long tailed lines
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)		6,900
Operating segments | Reinsurance | Medium tailed and long tailed lines | Casualty
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)		4,700
Operating segments | Mortgage
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)	$ 126,200	$ 45,100	$ 346,400	$ 99,100
Percentage of prior year development	44.70%	14.50%	39.90%	10.10%
Operating segments | Other
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior year development favorable (unfavorable)				$ (8,400)

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Allowance for Expected Credit Losses - Premiums receivable (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Credit Loss [Abstract]
Balance at beginning of period		$ 3,634,182	$ 2,866,578	$ 2,633,280	$ 2,064,586
Balance at end of period		3,579,380	2,807,720	3,579,380	2,807,720
Allowance for Expected Credit Losses
Balance at beginning of period		38,170	35,979	39,958	37,781
Change for provision of expected credit losses	[1]	59	2,736	(1,729)	934
Balance at end of period		38,229	38,715	38,229	38,715
Premium receivable, write-offs during the period		$ 1,900	$ 1,200	$ 6,600	$ 2,400

[1] Amounts deemed uncollectible are written-off in operating expenses. For the 2022 third quarter and 2021 third quarter, amounts written off were $1.9 million and $1.2 million, respectively. For the nine months ended September 30, 2022 and 2021 period, amounts written off were $6.6 million and $2.4 million, respectively.

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Allowance for Expected Credit Losses - Reinsurance recoverables (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Credit Loss [Abstract]
Balance at beginning of period	$ 5,938,511	$ 4,314,515	$ 5,880,735	$ 4,500,802
Balance at end of period	6,356,456	5,358,852	6,356,456	5,358,852
Allowance for Expected Credit Losses
Balance at beginning of period	14,740	11,029	13,230	11,636
Change for provision of expected credit losses	2,626	1,802	4,136	1,195
Balance at end of period	$ 17,366	$ 12,831	$ 17,366	$ 12,831

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Allowance for Expected Credit Losses - Ceded credit risk (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2022	Dec. 31, 2021	Jun. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Ceded Credit Risk [Line Items]
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses		$ 6,356,456	$ 5,880,735	$ 5,938,511	$ 5,358,852	$ 4,314,515	$ 4,500,802
Reinsurance recoverable | Reinsurer concentration risk | AM Best A minus Or Better Rating
Ceded Credit Risk [Line Items]
Concentration risk percentage		69.50%	69.70%
Reinsurance recoverable | Reinsurer concentration risk | AM Best Rating Below A Minus | All Other Carriers
Ceded Credit Risk [Line Items]
Concentration risk percentage		0.10%	0.10%
Reinsurance recoverable | Reinsurer concentration risk | Not Rated | All Other Carriers
Ceded Credit Risk [Line Items]
Concentration risk percentage	[1]	30.40%	30.20%
Reinsurance recoverable | Reinsurer concentration risk | Not Rated | Reinsurance trusts or letters of credit
Ceded Credit Risk [Line Items]
Concentration risk percentage		95.00%	91.00%
Stockholders' equity | Reinsurer concentration risk | Largest Balance Due From Any One Carrier
Ceded Credit Risk [Line Items]
Concentration risk percentage		9.10%	6.70%

[1] At September 30, 2022 and December 31, 2021 over 95% and 91% of such amount were collateralized through reinsurance trusts, funds withheld arrangements, letters of credit or other, respectively

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Allowance for Expected Credit Losses - Contractholder receivables (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Credit Loss [Abstract]
Balance at beginning of period	$ 1,758,018	$ 1,882,948	$ 1,828,691	$ 1,986,924
Balance at end of period	1,735,730	1,824,990	1,735,730	1,824,990
Allowance for Expected Credit Losses
Balance at beginning of period	3,005	4,471	3,437	8,638
Change for provision of expected credit losses	(645)	(987)	(1,077)	(5,154)
Balance at end of period	$ 2,360	$ 3,484	$ 2,360	$ 3,484

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Investment Information - Summary of available for sale securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 20,061,584		$ 19,732,825
Gross Unrealized Gains	115,738		198,691
Gross Unrealized Losses	(1,862,287)		(171,544)
Allowance for Expected Credit Losses	(45,993)	$ (58,410)	(2,883)	$ (2,111)	$ (2,124)	$ (2,397)
Cost or Amortized Cost	21,854,126		19,708,561
Fixed maturities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	18,120,727		17,998,109
Gross Unrealized Gains	114,319		198,123
Gross Unrealized Losses	(1,860,654)		(170,954)
Allowance for Expected Credit Losses	(45,993)		(2,883)
Cost or Amortized Cost	19,913,055		17,973,823
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	7,096,269		6,553,333
Gross Unrealized Gains	51,777		104,170
Gross Unrealized Losses	(895,365)		(69,194)
Allowance for Expected Credit Losses	(35,657)		(2,037)
Cost or Amortized Cost	7,975,514		6,520,394
Mortgage backed securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	763,371		408,477
Gross Unrealized Gains	7,561		2,825
Gross Unrealized Losses	(84,183)		(5,410)
Allowance for Expected Credit Losses	2		(48)
Cost or Amortized Cost	839,991		411,110
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	407,724		404,666
Gross Unrealized Gains	5,437		18,724
Gross Unrealized Losses	(37,692)		(1,409)
Allowance for Expected Credit Losses	(99)	$ (298)	(2)	$ (2)	$ (6)	$ (11)
Cost or Amortized Cost	440,078		387,353
Commercial mortgage backed securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	1,064,238		1,046,484
Gross Unrealized Gains	3,079		1,740
Gross Unrealized Losses	(50,010)		(3,117)
Allowance for Expected Credit Losses	(1,583)		(6)
Cost or Amortized Cost	1,112,752		1,047,867
US government and government agencies
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	5,126,407		4,772,764
Gross Unrealized Gains	36,074		10,076
Gross Unrealized Losses	(400,784)		(45,967)
Allowance for Expected Credit Losses	0		0
Cost or Amortized Cost	5,491,117		4,808,655
Non-US government securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	2,073,170		2,120,294
Gross Unrealized Gains	9,315		54,048
Gross Unrealized Losses	(287,583)		(34,749)
Allowance for Expected Credit Losses	(1,720)		(82)
Cost or Amortized Cost	2,353,158		2,101,077
Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	1,589,548		2,692,091
Gross Unrealized Gains	1,076		6,540
Gross Unrealized Losses	(105,037)		(11,108)
Allowance for Expected Credit Losses	(6,936)		(708)
Cost or Amortized Cost	1,700,445		2,697,367
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	1,940,857		1,734,716
Gross Unrealized Gains	1,419		568
Gross Unrealized Losses	(1,633)		(590)
Allowance for Expected Credit Losses	0		0
Cost or Amortized Cost	$ 1,941,071		$ 1,734,738

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Investment Information - Aging of available for sale securities in an unrealized loss position (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]
Estimated Fair Value - Less than 12 Months	$ 14,940,746	$ 12,238,683
Estimated Fair Value - 12 Months or More	2,936,029	297,357
Estimated Fair Value	17,876,775	12,536,040
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Gross Unrealized Losses - Less than 12 Months	(1,376,623)	(157,279)
Gross Unrealized Losses - 12 Months or More	(485,664)	(14,265)
Gross Unrealized Losses	(1,862,287)	(171,544)
Fixed maturities
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]
Estimated Fair Value - Less than 12 Months	14,713,545	11,953,950
Estimated Fair Value - 12 Months or More	2,936,029	297,357
Estimated Fair Value	17,649,574	12,251,307
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Gross Unrealized Losses - Less than 12 Months	(1,374,990)	(156,689)
Gross Unrealized Losses - 12 Months or More	(485,664)	(14,265)
Gross Unrealized Losses	(1,860,654)	(170,954)
Corporate bonds
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]
Estimated Fair Value - Less than 12 Months	5,596,229	3,639,582
Estimated Fair Value - 12 Months or More	1,470,800	98,867
Estimated Fair Value	7,067,029	3,738,449
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Gross Unrealized Losses - Less than 12 Months	(625,774)	(63,938)
Gross Unrealized Losses - 12 Months or More	(269,591)	(5,256)
Gross Unrealized Losses	(895,365)	(69,194)
Mortgage backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]
Estimated Fair Value - Less than 12 Months	620,572	222,176
Estimated Fair Value - 12 Months or More	93,902	46,809
Estimated Fair Value	714,474	268,985
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Gross Unrealized Losses - Less than 12 Months	(63,732)	(3,545)
Gross Unrealized Losses - 12 Months or More	(20,451)	(1,865)
Gross Unrealized Losses	(84,183)	(5,410)
Municipal bonds
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]
Estimated Fair Value - Less than 12 Months	373,219	26,665
Estimated Fair Value - 12 Months or More	9,399	16,361
Estimated Fair Value	382,618	43,026
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Gross Unrealized Losses - Less than 12 Months	(36,039)	(385)
Gross Unrealized Losses - 12 Months or More	(1,653)	(1,024)
Gross Unrealized Losses	(37,692)	(1,409)
Commercial mortgage backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]
Estimated Fair Value - Less than 12 Months	995,680	675,603
Estimated Fair Value - 12 Months or More	34,445	5,908
Estimated Fair Value	1,030,125	681,511
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Gross Unrealized Losses - Less than 12 Months	(49,215)	(2,805)
Gross Unrealized Losses - 12 Months or More	(795)	(312)
Gross Unrealized Losses	(50,010)	(3,117)
US government and government agencies
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]
Estimated Fair Value - Less than 12 Months	4,205,475	4,211,621
Estimated Fair Value - 12 Months or More	715,347	33,373
Estimated Fair Value	4,920,822	4,244,994
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Gross Unrealized Losses - Less than 12 Months	(303,805)	(44,180)
Gross Unrealized Losses - 12 Months or More	(96,979)	(1,787)
Gross Unrealized Losses	(400,784)	(45,967)
Non-US government securities
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]
Estimated Fair Value - Less than 12 Months	1,728,965	1,511,301
Estimated Fair Value - 12 Months or More	301,298	62,957
Estimated Fair Value	2,030,263	1,574,258
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Gross Unrealized Losses - Less than 12 Months	(221,540)	(31,983)
Gross Unrealized Losses - 12 Months or More	(66,043)	(2,766)
Gross Unrealized Losses	(287,583)	(34,749)
Asset backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]
Estimated Fair Value - Less than 12 Months	1,193,405	1,667,002
Estimated Fair Value - 12 Months or More	310,838	33,082
Estimated Fair Value	1,504,243	1,700,084
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Gross Unrealized Losses - Less than 12 Months	(74,885)	(9,853)
Gross Unrealized Losses - 12 Months or More	(30,152)	(1,255)
Gross Unrealized Losses	(105,037)	(11,108)
Short-term investments
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]
Estimated Fair Value - Less than 12 Months	227,201	284,733
Estimated Fair Value - 12 Months or More	0	0
Estimated Fair Value	227,201	284,733
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Gross Unrealized Losses - Less than 12 Months	(1,633)	(590)
Gross Unrealized Losses - 12 Months or More	0	0
Gross Unrealized Losses	$ (1,633)	$ (590)

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Investment Information - Maturity profile of available for sale securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Estimated Fair Value
Due in one year or less	$ 579,231	$ 300,889
Due after one year through five years	10,029,151	8,355,255
Due after five years through 10 years	3,856,180	4,689,155
Due after 10 years	239,008	505,758
Single maturity date	14,703,570	13,851,057
Estimated Fair Value	20,061,584	19,732,825
Amortized Cost
Due in one year or less	599,970	299,772
Due after one year through five years	10,808,495	8,339,387
Due after five years through 10 years	4,495,113	4,684,393
Due after 10 years	356,289	493,927
Single maturity date	16,259,867	13,817,479
Cost or Amortized Cost	21,854,126	19,708,561
Fixed maturities
Estimated Fair Value
Estimated Fair Value	18,120,727	17,998,109
Amortized Cost
Cost or Amortized Cost	19,913,055	17,973,823
Mortgage backed securities
Estimated Fair Value
Securities without single maturity date	763,371	408,477
Estimated Fair Value	763,371	408,477
Amortized Cost
Securities without single maturity date	839,991	411,110
Cost or Amortized Cost	839,991	411,110
Commercial mortgage backed securities
Estimated Fair Value
Securities without single maturity date	1,064,238	1,046,484
Estimated Fair Value	1,064,238	1,046,484
Amortized Cost
Securities without single maturity date	1,112,752	1,047,867
Cost or Amortized Cost	1,112,752	1,047,867
Asset backed securities
Estimated Fair Value
Securities without single maturity date	1,589,548	2,692,091
Estimated Fair Value	1,589,548	2,692,091
Amortized Cost
Securities without single maturity date	1,700,445	2,697,367
Cost or Amortized Cost	$ 1,700,445	$ 2,697,367

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Investment Information - Other investments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule Of Other Investments [Line Items]
Other investments, at fair value	$ 1,578,751	$ 1,973,550
Fixed maturities
Schedule Of Other Investments [Line Items]
Other investments, at fair value	530,303	416,698
Other investments
Schedule Of Other Investments [Line Items]
Other investments, at fair value	1,005,929	1,432,553
Other investments | Lending
Schedule Of Other Investments [Line Items]
Other investments, at fair value	398,789	536,345
Other investments | Investment grade fixed income
Schedule Of Other Investments [Line Items]
Other investments, at fair value	229,262	147,810
Other investments | Term loan investments
Schedule Of Other Investments [Line Items]
Other investments, at fair value	151,649	484,950
Other investments | Private equity
Schedule Of Other Investments [Line Items]
Other investments, at fair value	117,856	91,126
Other investments | Energy
Schedule Of Other Investments [Line Items]
Other investments, at fair value	55,250	81,692
Other investments | Credit related funds
Schedule Of Other Investments [Line Items]
Other investments, at fair value	53,123	70,278
Other investments | Infrastructure
Schedule Of Other Investments [Line Items]
Other investments, at fair value	0	20,352
Short-term investments
Schedule Of Other Investments [Line Items]
Other investments, at fair value	28,614	97,806
Equity securities
Schedule Of Other Investments [Line Items]
Other investments, at fair value	$ 13,905	$ 26,493

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Investment Information - Equity method investments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	$ 3,565,946	$ 3,077,611
Credit related funds
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	1,135,623	1,022,334
Private equity
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	761,997	436,042
Real estate
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	474,666	396,395
Lending
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	454,196	376,649
Equity securities
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	261,650	395,090
Infrastructure
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	236,920	230,070
Energy
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	113,778	119,141
Fixed income
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	$ 127,116	$ 101,890

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Investment Information - Limited partnership interests (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Maximum Exposure to Loss		$ 3,686,444	$ 3,248,206
Aggregate unfunded commitments		3,100,000	3,000,000
Equity method investments
Schedule of Equity Method Investments [Line Items]
Maximum Exposure to Loss	[1]	3,565,946	3,077,611
Aggregate unfunded commitments		2,800,000	2,600,000
Fair value option
Schedule of Equity Method Investments [Line Items]
Maximum Exposure to Loss	[2]	120,498	170,595
Aggregate unfunded commitments		$ 21,500	$ 18,800

[1] Aggregate unfunded commitments were $2.8 billion at September 30, 2022, compared to $2.6 billion at December 31, 2021.

[2] Aggregate unfunded commitments were $21.5 million at September 30, 2022, compared to $18.8 million at December 31, 2021.

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Investment Information - Net investment income (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net investment income:
Gross investment income		$ 145,777	$ 106,803	$ 372,286	$ 367,945
Investment expenses		(17,137)	(18,608)	(56,818)	(69,281)
Net investment income		128,640	88,195	315,468	298,664
Fixed maturities
Net investment income:
Gross investment income		123,568	75,964	310,963	255,215
Term loans
Net investment income:
Gross investment income		88	1,736	2,106	33,343
Equity securities
Net investment income:
Gross investment income		4,261	9,867	16,620	24,101
Short-term investments
Net investment income:
Gross investment income		9,304	1,858	15,999	3,603
Other
Net investment income:
Gross investment income	[1]	$ 8,556	$ 17,378	$ 26,598	$ 51,683

[1] Includes income distributions from investment funds and other items.

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Investment Information - Net realized gains and losses (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Available for sale securities:
Available for sale securities, gross gains on investment sales		$ 18,030	$ 86,819	$ 52,923	$ 267,362
Available for sale securities, gross losses on investment sales		(73,970)	(18,446)	(239,493)	(132,071)
Equity securities, at fair value:
Net realized gains (losses) on sales during the period		(6,401)	14,736	75,689	86,155
Net unrealized gains (losses) on equity securities still held at reporting date		(36,162)	(40,155)	(318,732)	45,400
Allowance for credit losses:
Allowance for credit losses - investments related		8,652	(456)	(48,096)	(1,208)
Allowance for credit losses - underwriting related		(4,232)	(3,985)	(7,676)	2,664
Derivative instruments	[1]	(48,196)	(21,435)	(117,591)	(36,428)
Other		(2,649)	(41,495)	(6,186)	(54,316)
Net realized gains (losses)		(183,673)	(25,040)	(742,666)	320,328
Fixed maturities
Available for sale securities:
Change in fair value of assets and liabilities accounted for using the fair value option		(19,304)	(7,492)	(89,148)	19,973
Other investments
Available for sale securities:
Change in fair value of assets and liabilities accounted for using the fair value option		(17,882)	3,811	(35,203)	111,550
Equity securities
Available for sale securities:
Change in fair value of assets and liabilities accounted for using the fair value option		(584)	3,042	(6,021)	10,599
Short-term investments
Available for sale securities:
Change in fair value of assets and liabilities accounted for using the fair value option		$ (975)	$ 16	$ (3,132)	$ 648

[1] See note 9 for information on the Company’s derivative instruments.

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Investment Information - Investment in operating affiliates (Details) € / shares in Units, $ / shares in Units, $ in Thousands, € in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 EUR (€) € / shares	Jul. 01, 2021 $ / shares
Schedule of Equity Method Investments [Line Items]
Time lag for reporting			3 months
Investment in operating affiliates	$ 891,212		$ 891,212		$ 1,135,655
Income (loss) from operating affiliates	$ 8,507	$ 124,119	$ 37,665	$ 224,052
Coface
Schedule of Equity Method Investments [Line Items]
Percentage ownership	29.86%		29.86%		29.50%	29.50%
Investment in affiliate, price per share | € / shares						€ 9.95
Operating affiliate, aggregate cost					$ 546,000	€ 453
Investment in operating affiliates	$ 506,700		$ 506,700		630,500
Operating affiliate, gain on acquisition					74,500
Greysbridge Holdings Ltd
Schedule of Equity Method Investments [Line Items]
Percentage ownership							40.00%
Investment in affiliate, price per share | $ / shares							$ 35.00
Operating affiliate, aggregate cost					278,900
Investment in operating affiliates	$ 277,600		$ 277,600		375,700
Operating affiliate, gain on acquisition					$ 95,700
Issued Shares Excluding Treasury Stock | Coface
Schedule of Equity Method Investments [Line Items]
Percentage ownership	30.05%		30.05%
Kelso And Company | Greysbridge Holdings Ltd
Schedule of Equity Method Investments [Line Items]
Percentage ownership							30.00%
Warburg Pincus LLC | Greysbridge Holdings Ltd
Schedule of Equity Method Investments [Line Items]
Percentage ownership							30.00%

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Investment Information - Allowance for expected credit losses (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Allowance for expected credit losses
Balance at beginning of period		$ 58,410	$ 2,124	$ 2,883	$ 2,397
Additions for current-period provision for expected credit losses		3,780	48	53,521	2,710
Additions (reductions) for previously recognized expected credit losses		(12,530)	405	(5,609)	(1,317)
Reductions due to disposals		(3,667)	(466)	(4,802)	(1,679)
Balance at end of period		45,993	2,111	45,993	2,111
Structured securities
Allowance for expected credit losses
Balance at beginning of period	[1]	18,283	759	802	1,490
Additions for current-period provision for expected credit losses	[1]	1,782	48	12,560	282
Additions (reductions) for previously recognized expected credit losses	[1]	(9,767)	14	(2,575)	(751)
Reductions due to disposals	[1]	(1,780)	(234)	(2,269)	(434)
Balance at end of period	[1]	8,518	587	8,518	587
Municipal bonds
Allowance for expected credit losses
Balance at beginning of period		298	6	2	11
Additions for current-period provision for expected credit losses		12	0	359	0
Additions (reductions) for previously recognized expected credit losses		(211)	(4)	(262)	(9)
Reductions due to disposals		0	0	0	0
Balance at end of period		99	2	99	2
Corporate bonds
Allowance for expected credit losses
Balance at beginning of period		39,829	1,359	2,079	896
Additions for current-period provision for expected credit losses		1,986	0	40,602	2,428
Additions (reductions) for previously recognized expected credit losses		(2,552)	395	(2,772)	(557)
Reductions due to disposals		(1,887)	(232)	(2,533)	(1,245)
Balance at end of period		$ 37,376	$ 1,522	$ 37,376	$ 1,522

[1] Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.

XML

Investment Information - Restricted assets (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Restricted Assets [Line Items]
Restricted assets	$ 8,335,957	$ 8,249,732
Collateral or guarantees - affiliated transactions
Restricted Assets [Line Items]
Restricted assets	4,212,521	4,223,955
Collateral or guarantees - third party agreements
Restricted Assets [Line Items]
Restricted assets	2,847,814	2,721,160
Deposits with US regulatory authorities
Restricted Assets [Line Items]
Restricted assets	756,368	798,100
Deposits with non-US regulatory authorities
Restricted Assets [Line Items]
Restricted assets	$ 519,254	$ 506,517

XML

Investment Information - Cash and restricted cash (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Disclosure Investment Information [Abstract]
Cash	$ 813,583	$ 858,668
Restricted cash (included in ‘other assets’)	444,741	456,103
Cash and restricted cash	$ 1,258,324	$ 1,314,771	$ 1,548,909	$ 1,290,544

XML

Investment Information - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) lots	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) lots	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) lots
Continuous unrealized loss, qualitative disclosures:
Number of positions in an unrealized loss position (lots) | lots	9,590		9,590		4,700
Total number of positions (lots) | lots	11,500		11,500		10,240
Largest single loss	$ 7,200		$ 7,200		$ 1,100
Narrative items:
Equity securities, at fair value	809,869		809,869		$ 1,804,170
Equity in net (loss) income of investment funds accounted for using the equity method	$ (18,861)	$ 105,398	$ 75,505	$ 299,270
Time lag for reporting			3 months
Minimum
Narrative items:
Time lag for reporting			1 month
Maximum
Narrative items:
Time lag for reporting			3 months

XML

Fair Value - Fair Value Hierarchy (Details) - Recurring - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		$ 7,759,369	$ 7,602,828
Liabilities measured at fair value		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential mortgage loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		5,100,908	4,744,517
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturities | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturities | Mortgage backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturities | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturities | Commercial mortgage backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturities | US government and government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		5,100,908	4,744,517
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturities | Non-US government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturities | Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		1,873,480	1,052,822
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		775,264	1,762,864
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		9,717	42,625
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value option | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value option | Non-US government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value option | Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value option | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		405	528
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value option | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		9,312	21,745
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value option | Other investments fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	20,352
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		13,996,698	14,923,923
Liabilities measured at fair value		(112,577)	(54,224)
Significant Other Observable Inputs (Level 2) | Other liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value		0	0
Significant Other Observable Inputs (Level 2) | Derivative instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value		(112,577)	(54,224)
Significant Other Observable Inputs (Level 2) | Residential mortgage loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		2,255	49,847
Significant Other Observable Inputs (Level 2) | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		13,019,806	13,250,232
Significant Other Observable Inputs (Level 2) | Fixed maturities | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		7,096,256	6,553,320
Significant Other Observable Inputs (Level 2) | Fixed maturities | Mortgage backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		763,371	408,477
Significant Other Observable Inputs (Level 2) | Fixed maturities | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		407,724	404,666
Significant Other Observable Inputs (Level 2) | Fixed maturities | Commercial mortgage backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		1,064,238	1,046,484
Significant Other Observable Inputs (Level 2) | Fixed maturities | US government and government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		25,499	28,247
Significant Other Observable Inputs (Level 2) | Fixed maturities | Non-US government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		2,073,170	2,120,294
Significant Other Observable Inputs (Level 2) | Fixed maturities | Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		1,589,548	2,688,744
Significant Other Observable Inputs (Level 2) | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		67,377	681,894
Significant Other Observable Inputs (Level 2) | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		31,566	38,388
Significant Other Observable Inputs (Level 2) | Derivative instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		176,160	127,121
Significant Other Observable Inputs (Level 2) | Fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		699,534	776,441
Significant Other Observable Inputs (Level 2) | Fair value option | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		524,177	388,546
Significant Other Observable Inputs (Level 2) | Fair value option | Non-US government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		4,032	23,785
Significant Other Observable Inputs (Level 2) | Fair value option | Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		2,094	4,367
Significant Other Observable Inputs (Level 2) | Fair value option | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		28,209	97,278
Significant Other Observable Inputs (Level 2) | Fair value option | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		1	0
Significant Other Observable Inputs (Level 2) | Fair value option | Other investments fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		141,021	262,465
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		41,882	39,007
Liabilities measured at fair value		(13,421)	(16,960)
Significant Unobservable Inputs (Level 3) | Other liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value		(13,421)	(16,960)
Significant Unobservable Inputs (Level 3) | Derivative instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value		0	0
Significant Unobservable Inputs (Level 3) | Residential mortgage loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Significant Unobservable Inputs (Level 3) | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		13	3,360
Significant Unobservable Inputs (Level 3) | Fixed maturities | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		13	13
Significant Unobservable Inputs (Level 3) | Fixed maturities | Mortgage backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Significant Unobservable Inputs (Level 3) | Fixed maturities | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Significant Unobservable Inputs (Level 3) | Fixed maturities | Commercial mortgage backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Significant Unobservable Inputs (Level 3) | Fixed maturities | US government and government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Significant Unobservable Inputs (Level 3) | Fixed maturities | Non-US government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Significant Unobservable Inputs (Level 3) | Fixed maturities | Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	3,347
Significant Unobservable Inputs (Level 3) | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Significant Unobservable Inputs (Level 3) | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		3,039	2,918
Significant Unobservable Inputs (Level 3) | Derivative instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Significant Unobservable Inputs (Level 3) | Fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		38,830	32,729
Significant Unobservable Inputs (Level 3) | Fair value option | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Significant Unobservable Inputs (Level 3) | Fair value option | Non-US government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Significant Unobservable Inputs (Level 3) | Fair value option | Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Significant Unobservable Inputs (Level 3) | Fair value option | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		0	0
Significant Unobservable Inputs (Level 3) | Fair value option | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		4,592	4,748
Significant Unobservable Inputs (Level 3) | Fair value option | Other investments fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		34,238	27,981
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		22,628,619	23,687,513
Liabilities measured at fair value		(125,998)	(71,184)
Estimated Fair Value | Other liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value		(13,421)	(16,960)
Estimated Fair Value | Derivative instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value		(112,577)	(54,224)
Estimated Fair Value | Residential mortgage loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		2,255	49,847
Estimated Fair Value | Fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		18,120,727	17,998,109
Estimated Fair Value | Fixed maturities | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		7,096,269	6,553,333
Estimated Fair Value | Fixed maturities | Mortgage backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		763,371	408,477
Estimated Fair Value | Fixed maturities | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		407,724	404,666
Estimated Fair Value | Fixed maturities | Commercial mortgage backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		1,064,238	1,046,484
Estimated Fair Value | Fixed maturities | US government and government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		5,126,407	4,772,764
Estimated Fair Value | Fixed maturities | Non-US government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		2,073,170	2,120,294
Estimated Fair Value | Fixed maturities | Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		1,589,548	2,692,091
Estimated Fair Value | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		1,940,857	1,734,716
Estimated Fair Value | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		809,869	1,804,170
Estimated Fair Value | Derivative instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		176,160	127,121
Estimated Fair Value | Fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		1,578,751	1,973,550
Estimated Fair Value | Fair value option | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		524,177	388,546
Estimated Fair Value | Fair value option | Non-US government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		4,032	23,785
Estimated Fair Value | Fair value option | Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		2,094	4,367
Estimated Fair Value | Fair value option | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		28,614	97,806
Estimated Fair Value | Fair value option | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		13,905	26,493
Estimated Fair Value | Fair value option | Other investments fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value		175,259	310,798
Estimated Fair Value | Fair value option | Other investments measured at net asset value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	[1]	$ 830,670	$ 1,121,755

[1] In accordance with applicable accounting guidance, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.

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Fair Value - Rollforward of Level 3 assets and liabilities (Details) - Recurring - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021		Sep. 30, 2022	Sep. 30, 2021
Other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period		$ (16,205)	$ (466)		$ (16,960)	$ (461)
Total gains or (losses) (realized/unrealized) - included in earnings	[1]	(89)	0		(284)	0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income		965	0		1,915	0
Purchases, issuances, sales and settlements
Purchases		0	(17,345)		0	(17,345)
Issuances		0	0		0	0
Sales		0	0	[2]	0	0	[2]
Settlements		1,908	0		1,908	(5)
Transfers in and/or out of Level 3		0	0		0	0
Balance at end of period		(13,421)	(17,811)		(13,421)	(17,811)
Available for sale | Structured securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	[3]	2,867	3,424		3,347	3,426
Total gains or (losses) (realized/unrealized) - included in earnings	[1],[3]	(601)	10		(592)	(46)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income	[3]	144	10		(1)	67
Purchases, issuances, sales and settlements
Purchases	[3]	0	0		0	0
Issuances	[3]	0	0		0	0
Sales	[3]	(2,051)	0	[2]	(2,051)	0	[2]
Settlements	[3]	(359)	0		(703)	(3)
Transfers in and/or out of Level 3	[3]	0	0		0	0
Balance at end of period	[3]	0	3,444		0	3,444
Available for sale | Corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period		3,570	13		13	13
Total gains or (losses) (realized/unrealized) - included in earnings	[1]	52	0		52	0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income		(59)	0		(59)	0
Purchases, issuances, sales and settlements
Purchases		0	0		0	0
Issuances		0	0		0	0
Sales		(3,550)	0	[2]	(3,550)	0	[2]
Settlements		0	0		0	0
Transfers in and/or out of Level 3		0	0		3,557	0
Balance at end of period		13	13		13	13
Fair value option | Corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period		0	998		0	985
Total gains or (losses) (realized/unrealized) - included in earnings	[1]	0	0		0	13
Total gains or (losses) (realized/unrealized) - included in other comprehensive income		0	0		0	0
Purchases, issuances, sales and settlements
Purchases		0	0		0	0
Issuances		0	0		0	0
Sales		0	(998)	[2]	0	(998)	[2]
Settlements		0	0		0	0
Transfers in and/or out of Level 3		0	0		0	0
Balance at end of period		0	0		0	0
Fair value option | Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period		33,331	73,900		27,981	67,103
Total gains or (losses) (realized/unrealized) - included in earnings	[1]	116	0		150	881
Total gains or (losses) (realized/unrealized) - included in other comprehensive income		0	0		0	0
Purchases, issuances, sales and settlements
Purchases		1,458	0		12,228	13,003
Issuances		0	0		0	0
Sales		(667)	(44,143)	[2]	(3,138)	(51,230)	[2]
Settlements		0	0		(2,983)	0
Transfers in and/or out of Level 3		0	0		0	0
Balance at end of period		34,238	29,757		34,238	29,757
Fair value option | Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period		4,392	73,678		4,748	68,988
Total gains or (losses) (realized/unrealized) - included in earnings	[1]	200	38		(156)	4,728
Total gains or (losses) (realized/unrealized) - included in other comprehensive income		0	0		0	0
Purchases, issuances, sales and settlements
Purchases		0	0		0	0
Issuances		0	0		0	0
Sales		0	(69,181)	[2]	0	(69,181)	[2]
Settlements		0	0		0	0
Transfers in and/or out of Level 3		0	0		0	0
Balance at end of period		4,592	4,535		4,592	4,535
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period		2,906	49,136		2,918	42,015
Total gains or (losses) (realized/unrealized) - included in earnings	[1]	133	11		(103)	1,837
Total gains or (losses) (realized/unrealized) - included in other comprehensive income		0	0		0	0
Purchases, issuances, sales and settlements
Purchases		0	208		227	5,503
Issuances		0	0		0	0
Sales		0	(46,773)	[2]	(3)	(46,773)	[2]
Settlements		0	0		0	0
Transfers in and/or out of Level 3		0	0		0	0
Balance at end of period		$ 3,039	$ 2,582		$ 3,039	$ 2,582

[1] Gains or losses were included in net realized gains (losses).

[2] Sales for the 2021 periods primarily related to the Company’s deconsolidation of Somers..

[3] Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.

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Fair Value - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Total assets and liabilities measured at fair value	$ 22,800,000	$ 23,800,000
Total assets and liabilities measured at fair value priced using non-binding broker quotes	$ 12,600	$ 7,700
Total assets and liabilities measured at fair value priced using non-binding broker quotes (percentage)	0.10%	0.00%
Senior notes	$ 2,725,153	$ 2,724,394
Estimated fair value of senior notes	$ 2,300,000	$ 3,300,000

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Derivative Instruments - Fair value and notional amount of derivatives (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
Derivative offsetting
Derivative assets subject to master netting agreements		$ 164,900	$ 122,300
Derivative liabilities subject to master netting agreements		$ 112,600	$ 53,900
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other assets	Other assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other liabilities	Other liabilities
Not designated as hedging instrument
Derivative [Line Items]
Asset derivatives - fair value		$ 176,160	$ 127,121
Liability derivatives - fair value		(112,577)	(54,224)
Not designated as hedging instrument | Futures contracts
Derivative [Line Items]
Asset derivatives - fair value	[1]	72,730	34,999
Liability derivatives - fair value	[1]	(60,684)	(9,808)
Net derivatives - notional value	[2]	2,189,945	2,826,564
Not designated as hedging instrument | Foreign currency forward contracts
Derivative [Line Items]
Asset derivatives - fair value	[1]	25,281	7,734
Liability derivatives - fair value	[1]	(26,995)	(11,390)
Net derivatives - notional value	[2]	835,941	915,962
Not designated as hedging instrument | TBAs
Derivative [Line Items]
Asset derivatives - fair value	[1]	0	11,227
Liability derivatives - fair value	[1]	0	0
Net derivatives - notional value	[2]	0	11,227
Not designated as hedging instrument | Other
Derivative [Line Items]
Asset derivatives - fair value	[1]	78,149	73,161
Liability derivatives - fair value	[1]	(24,898)	(33,026)
Net derivatives - notional value	[2]	$ 3,766,549	$ 3,736,773

[1] The fair value of asset derivatives are included in ‘other assets’ and the fair value of liability derivatives are included in ‘other liabilities.’

[2] Represents the absolute notional value of all outstanding contracts, consisting of long and short positions.

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Derivative Instruments - Summary of net realized gains (losses) recorded in the consolidated statements of income (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments	[1]	$ (48,196)	$ (21,435)	$ (117,591)	$ (36,428)
Not designated as hedging instrument
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments		(48,196)	(21,435)	(117,591)	(36,428)
Not designated as hedging instrument | Futures contracts
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments		(26,347)	(10,073)	(112,326)	(17,394)
Not designated as hedging instrument | Foreign currency forward contracts
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments		(18,340)	(16,146)	(46,016)	(36,922)
Not designated as hedging instrument | TBAs
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments		0	(46)	(51)	(46)
Not designated as hedging instrument | Other
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments	[2]	$ (3,509)	$ 4,830	$ 40,802	$ 17,934

[1] See note 9 for information on the Company’s derivative instruments.

[2] Includes realized gains and losses on swaps, options and other derivatives contracts

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Commitments and Contingencies (Details) - USD ($) $ in Millions		9 Months Ended
	Apr. 07, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Investment commitments		$ 3,100.0		$ 3,000.0
Interest paid on senior notes and other borrowings		65.0	$ 75.8
Credit Agreement
Line of Credit Facility [Line Items]
Credit facility term	5 years
Maximum borrowing capacity	$ 925.0
Optional increased capacity	1,300.0
Secured Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	425.0	425.0
Revolving credit agreement borrowings		311.8
Remaining capacity		113.2
Unsecured Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 500.0
Secured Letters of Credit | Subsidiaries
Line of Credit Facility [Line Items]
Revolving credit agreement borrowings		22.7
Unsecured Letters of Credit | Subsidiaries
Line of Credit Facility [Line Items]
Revolving credit agreement borrowings		$ 290.0

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Variable Interest Entities and Noncontrolling Interests - Variable interest entity (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended	9 Months Ended
	Mar. 31, 2014	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jul. 01, 2021
Variable Interest Entity [Line Items]
Net cash provided by (used for) operating activities			$ 2,833,717	$ 2,627,551
Net cash provided by (used for) investing activities			(2,106,721)	(1,453,284)
Net cash (used for) provided by financing activities			$ (703,877)	$ (881,879)
Greysbridge Holdings Ltd
Variable Interest Entity [Line Items]
Percentage ownership					40.00%
Kelso And Company | Greysbridge Holdings Ltd
Variable Interest Entity [Line Items]
Percentage ownership					30.00%
Warburg Pincus LLC | Greysbridge Holdings Ltd
Variable Interest Entity [Line Items]
Percentage ownership					30.00%
Variable Interest Entity, Primary Beneficiary | Somers Holdings Ltd
Variable Interest Entity [Line Items]
Initial investment contribution amount	$ 100,000
Ownership percentage	11.00%
Net cash provided by (used for) operating activities		$ 47,000
Net cash provided by (used for) investing activities		96,300
Net cash (used for) provided by financing activities		$ (2,000)

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Variable Interest Entities and Noncontrolling Interests - Redeemable noncontrolling interests (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests, beginning of period			$ 9,233
Redeemable noncontrolling interests, end of period	$ 8,908		8,908
Somers Holdings Ltd
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests, beginning of period	8,459	$ 57,533	9,233	$ 58,548
Impact of deconsolidation of Somers	0	(48,919)	0	(48,919)
Other	449	1,623	(325)	608
Redeemable noncontrolling interests, end of period	$ 8,908	$ 10,237	$ 8,908	$ 10,237

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Variable Interest Entities and Noncontrolling Interests - Income or loss attributable to third party investors (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Noncontrolling Interest [Abstract]
Amounts attributable to non-redeemable noncontrolling interests	$ 0	$ 0	$ 0	$ (78,314)
Amounts attributable to redeemable noncontrolling interests	(1,157)	(1,473)	(2,390)	(3,889)
Net (income) loss attributable to noncontrolling interests	$ (1,157)	$ (1,473)	$ (2,390)	$ (82,203)

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Variable Interest Entities and Noncontrolling Interests - Other variable interest entity disclosures (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Total VIE Assets		$ 46,337,104	$ 45,100,945
Maximum Exposure to Loss - Off-Balance Sheet		3,686,444	3,248,206
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total VIE Assets		3,824,794	4,336,596
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability		(11,216)	(4,434)
Maximum Exposure to Loss - Off-Balance Sheet		23,435	42,202
Maximum Exposure to Loss		12,219	37,768
Remaining Coverage, Amount		425,530
Variable Interest Entity, Not Primary Beneficiary | 2017-1 Ltd. (Oct-17)
Variable Interest Entity [Line Items]
Total VIE Assets		46,772	108,368
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability		(23)	(159)
Maximum Exposure to Loss - Off-Balance Sheet		88	424
Maximum Exposure to Loss		65	265
Variable Interest Entity, Not Primary Beneficiary | 2018-1 Ltd. (Apr-18)
Variable Interest Entity [Line Items]
Total VIE Assets		103,131	181,136
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability		(220)	(528)
Maximum Exposure to Loss - Off-Balance Sheet		644	1,268
Maximum Exposure to Loss		424	740
Variable Interest Entity, Not Primary Beneficiary | 2018-3 Ltd. (Oct-18)
Variable Interest Entity [Line Items]
Total VIE Assets		217,701	302,563
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability		(862)	(1,018)
Maximum Exposure to Loss - Off-Balance Sheet		2,107	2,496
Maximum Exposure to Loss		1,245	1,478
Variable Interest Entity, Not Primary Beneficiary | 2019-1 Ltd. (Mar-19)
Variable Interest Entity [Line Items]
Total VIE Assets		119,193	181,324
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability		(496)	(380)
Maximum Exposure to Loss - Off-Balance Sheet		2,704	5,807
Maximum Exposure to Loss		2,208	5,427
Variable Interest Entity, Not Primary Beneficiary | 2019-2 Ltd. (Apr-19)
Variable Interest Entity [Line Items]
Total VIE Assets		347,050	398,316
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability		(656)	(515)
Maximum Exposure to Loss - Off-Balance Sheet		4,308	3,998
Maximum Exposure to Loss		3,652	3,483
Variable Interest Entity, Not Primary Beneficiary | 2019-3 Ltd. (Jul-19)
Variable Interest Entity [Line Items]
Total VIE Assets		257,663	409,859
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability		(192)	(584)
Maximum Exposure to Loss - Off-Balance Sheet		1,492	3,190
Maximum Exposure to Loss		1,300	2,606
Variable Interest Entity, Not Primary Beneficiary | 2019-4 Ltd. (Oct-19)
Variable Interest Entity [Line Items]
Total VIE Assets		283,684	411,954
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability		(532)	(462)
Maximum Exposure to Loss - Off-Balance Sheet		3,663	4,759
Maximum Exposure to Loss		3,131	4,297
Variable Interest Entity, Not Primary Beneficiary | 2020-2 Ltd. (Sep-20)
Variable Interest Entity [Line Items]
Total VIE Assets		122,897	217,766
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability		(20)	(177)
Maximum Exposure to Loss - Off-Balance Sheet		595	1,984
Maximum Exposure to Loss		575	1,807
Remaining Coverage, Amount	[1]	153
Variable Interest Entity, Not Primary Beneficiary | 2020-3 Ltd. (Nov-20)
Variable Interest Entity [Line Items]
Total VIE Assets		268,385	348,818
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability		(204)	(128)
Maximum Exposure to Loss - Off-Balance Sheet		2,845	5,793
Maximum Exposure to Loss		2,641	5,665
Remaining Coverage, Amount	[1]	8,569
Variable Interest Entity, Not Primary Beneficiary | 2020-4 Ltd. (Dec-20)
Variable Interest Entity [Line Items]
Total VIE Assets		107,396	176,826
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability		10	(50)
Maximum Exposure to Loss - Off-Balance Sheet		707	1,630
Maximum Exposure to Loss		717	1,580
Remaining Coverage, Amount	[1]	4,795
Variable Interest Entity, Not Primary Beneficiary | 2021-1 Ltd. (Mar-21)
Variable Interest Entity [Line Items]
Total VIE Assets		497,069	568,986
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability		(2,234)	(303)
Maximum Exposure to Loss - Off-Balance Sheet		936	3,283
Maximum Exposure to Loss		(1,298)	2,980
Remaining Coverage, Amount	[1]	43,198
Variable Interest Entity, Not Primary Beneficiary | 2021-2 Ltd. (Jun-21)
Variable Interest Entity [Line Items]
Total VIE Assets		471,039	522,807
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability		(2,047)	281
Maximum Exposure to Loss - Off-Balance Sheet		984	4,124
Maximum Exposure to Loss		(1,063)	4,405
Remaining Coverage, Amount	[1]	80,268
Variable Interest Entity, Not Primary Beneficiary | 2021-3 Ltd. (Sep-21)
Variable Interest Entity [Line Items]
Total VIE Assets		498,309	507,873
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability		(2,414)	(411)
Maximum Exposure to Loss - Off-Balance Sheet		991	3,446
Maximum Exposure to Loss		(1,423)	$ 3,035
Remaining Coverage, Amount	[1]	129,127
Variable Interest Entity, Not Primary Beneficiary | 2022-1 Ltd. (Jan-22)
Variable Interest Entity [Line Items]
Total VIE Assets		283,500
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability		(1,326)
Maximum Exposure to Loss - Off-Balance Sheet		627
Maximum Exposure to Loss		(699)
Remaining Coverage, Amount	[1]	33,260
Variable Interest Entity, Not Primary Beneficiary | 2022-2 Ltd. (Sep-22)
Variable Interest Entity [Line Items]
Total VIE Assets		201,005
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability		0
Maximum Exposure to Loss - Off-Balance Sheet		744
Maximum Exposure to Loss		744
Remaining Coverage, Amount	[1]	$ 126,160

[1] Coverage from a separate panel of reinsurers remaining at September 30, 2022.

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Other Comprehensive Income (Loss) - Amounts reclassified from accumulated other comprehensive income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for credit losses	$ 8,652	$ (456)	$ (48,096)	$ (1,208)
Income tax expense	14,900	(4,137)	(19,042)	(94,176)
Net of tax	18,258	421,415	619,635	1,615,787
Reclassification out of accumulated other comprehensive income | Unrealized appreciation on available-for-sale investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains (losses)	(55,940)	68,373	(186,570)	135,291
Provision for credit losses	8,652	(457)	(48,096)	(1,208)
Income (loss) before income taxes and income (loss) from operating affiliates	(47,288)	67,916	(234,666)	134,083
Income tax expense	703	(5,262)	28,093	(13,579)
Net of tax	$ (46,585)	$ 62,654	$ (206,573)	$ 120,504

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Other Comprehensive Income (Loss) - Components of other comprehensive income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Before tax amount:
Unrealized holding gains (losses) arising during period, before tax	$ (671,907)	$ (104,607)	$ (2,132,845)	$ (307,910)
Less reclassification of net realized gains included in net income, before tax	(47,288)	67,916	(234,666)	134,083
Foreign currency translation adjustments, before tax	(70,388)	(32,060)	(141,515)	(54,083)
Other comprehensive income (loss), before tax	(695,007)	(204,583)	(2,039,694)	(496,076)
Tax expense (benefit):
Unrealized holding gains (losses) arising during period, tax	(62,148)	(8,684)	(240,726)	(28,808)
Less reclassification of net realized gains included in net income, tax	(703)	5,262	(28,093)	13,579
Foreign currency translation adjustments, tax	0	(350)	166	6
Other comprehensive income (loss), tax	(61,445)	(14,296)	(212,467)	(42,381)
Net of tax amount:
Unrealized holding gains (losses) arising during period, net of tax	(609,759)	(95,923)	(1,892,119)	(279,102)
Less reclassification of net realized gains included in net income, net of tax	(46,585)	62,654	(206,573)	120,504
Foreign currency translation adjustments, net of tax	(70,388)	(31,710)	(141,681)	(54,089)
Net current period other comprehensive income (loss)	$ (633,562)	$ (190,287)	$ (1,827,227)	$ (453,695)

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Income Taxes (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Effective tax rate on income before income taxes (percentage)	3.00%	5.50%
Tax benefit from change in valuation allowance on certain UK deferred tax assets	$ 36,500	$ 28,700
Decrease in effective tax rate due to change in valuation allowance on certain UK deferred tax assets	5.70%	1.70%
Net deferred tax asset	$ 572,100		$ 194,000
Income taxes paid	$ 201,600	$ 202,400

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Transactions With Related Parties (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jan. 01, 2024	Jun. 30, 2022	Dec. 31, 2021	Jul. 01, 2021	Jun. 30, 2021	Jan. 01, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Premiums ceded	$ 1,136,909	$ 1,131,486	$ 3,488,632	$ 2,907,002
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses	6,356,456	5,358,852	6,356,456	5,358,852		$ 5,938,511	$ 5,880,735		$ 4,314,515		$ 4,500,802
Reinsurance balances payable	1,669,592		1,669,592				1,583,253
Forecast
Related Party Transaction [Line Items]
Put/call option, proportion of initial shares					33.30%
Greysbridge Holdings Ltd
Related Party Transaction [Line Items]
Percentage ownership								40.00%
Kelso And Company | Greysbridge Holdings Ltd
Related Party Transaction [Line Items]
Percentage ownership								30.00%
Warburg Pincus LLC | Greysbridge Holdings Ltd
Related Party Transaction [Line Items]
Percentage ownership								30.00%
Operating affiliates | Premia Holdings Ltd
Related Party Transaction [Line Items]
Legacy business, amount of liabilities transferred										$ 380,000
Operating affiliates | Somers Holdings Ltd
Related Party Transaction [Line Items]
Premiums ceded	236,500	$ 316,200	661,100	$ 316,200
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses	1,100,000		1,100,000				902,800
Reinsurance balances payable	408,000		408,000				$ 258,400
Senior notes, face amount	$ 35,000		$ 35,000
Senior notes, stated percentage	6.50%		6.50%