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 March 31, 2023

OR

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

Commission file number 001-35416

 

U.S. Silica Holdings, Inc.

(Exact name of registrant as specified in its charter)

Delaware	26-3718801
(State or other jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)

24275 Katy Freeway, Suite 600

Katy, Texas 77494

(Address of Principal Executive Offices) (Zip Code)

(281) 258-2170

(Registrant’s telephone number, including area code)

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

Title of each class	Trading Symbol	Name of each exchange on which registered
Common Stock, $0.01 par value	SLCA	New York Stock Exchange

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  þ    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  þ    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	þ	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 Act).    Yes  ☐  No  þ

As of April 21, 2023, 77,063,957 shares of common stock, par value $0.01 per share, of the registrant were outstanding.

U.S. SILICA HOLDINGS, INC.

FORM 10-Q

For the Quarter Ended March 31, 2023

TABLE OF CONTENTS

		Page
PART I	Financial Information (Unaudited):
Item 1.	Financial Statements	2
	Condensed Consolidated Balance Sheets	2
	Condensed Consolidated Statements of Operations	3
	Condensed Consolidated Statements of Comprehensive Income (Loss)	4
	Condensed Consolidated Statements of Stockholders’ Equity	5
	Condensed Consolidated Statements of Cash Flows	6
	Notes to Condensed Consolidated Financial Statements	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	25
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	37
Item 4.	Controls and Procedures	39
PART II	Other Information:
Item 1.	Legal Proceedings	40
Item 1A.	Risk Factors	40
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	41
Item 3.	Defaults Upon Senior Securities	42
Item 4.	Mine Safety Disclosures	42
Item 5.	Other Information	42
Item 6.	Exhibits	42
Signatures		S-1

PART I-FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

U.S. SILICA HOLDINGS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited; dollars in thousands except share information)

	March 31, 2023		December 31, 2022
ASSETS
Current Assets:
Cash and cash equivalents	$	139,494	$	280,845
Accounts receivable, net	226,395		208,631
Inventories, net	152,419		147,626
Prepaid expenses and other current assets	16,525		20,182
Total current assets	534,833		657,284
Property, plant and mine development, net	1,161,250		1,178,834
Lease right-of-use assets	39,818		42,374
Goodwill	185,649		185,649
Intangible assets, net	138,452		140,809
Other assets	9,921		9,630
Total assets	$	2,069,923	$	2,214,580
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities:
Accounts payable and accrued expenses	$	178,738	$	216,239
Current portion of operating lease liabilities	19,101		19,773
Current portion of long-term debt	13,590		19,535
Current portion of deferred revenue	10,793		16,275
Income tax payable	4,436		128
Total current liabilities	226,658		271,950
Long-term debt, net	897,013		1,037,458
Deferred revenue	14,390		14,477
Liability for pension and other post-retirement benefits	30,476		30,911
Deferred income taxes, net	73,304		64,636
Operating lease liabilities	60,135		64,478
Other long-term liabilities	26,390		25,976
Total liabilities	1,328,366		1,509,886
Commitments and Contingencies (Note N)
Stockholders’ Equity:
Preferred stock, $0.01 par value, 10,000,000 shares authorized; zero issued and outstanding at March 31, 2023 and December 31, 2022	—		—
Common stock, $0.01 par value, 500,000,000 shares authorized; 87,793,520 issued and 77,063,671 outstanding at March 31, 2023; 85,631,109 issued and 75,738,512 outstanding at December 31, 2022	876		854
Additional paid-in capital	1,238,098		1,234,834
Retained deficit	(306,436)		(351,084)
Treasury stock, at cost, 10,729,849 and 9,892,597 shares at March 31, 2023 and December 31, 2022, respectively	(196,116)		(186,196)
Accumulated other comprehensive loss	(2,448)		(1,723)
Total U.S. Silica Holdings, Inc. stockholders’ equity	733,974		696,685
Non-controlling interest	7,583		8,009
Total stockholders' equity	741,557		704,694
Total liabilities and stockholders’ equity	$	2,069,923	$	2,214,580

The accompanying notes are an integral part of these financial statements.

2

U.S. SILICA HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited; dollars in thousands, except per share amounts)

	Three Months Ended   March 31,
	2023		2022
Sales:
Product	$	344,014	$	233,234
Service	98,226		71,653
Total sales	442,240		304,887
Cost of sales (excluding depreciation, depletion and amortization):
Product	225,894		173,608
Service	67,239		53,261
Total cost of sales (excluding depreciation, depletion and amortization)	293,133		226,869
Operating expenses:
Selling, general and administrative	29,163		40,110
Depreciation, depletion and amortization	35,386		37,749
Total operating expenses	64,549		77,859
Operating income	84,558		159
Other (expense) income:
Interest expense	(24,061)		(17,173)
Other (expense) income, net, including interest income	(2,352)		1,531
Total other expense	(26,413)		(15,642)
Income (loss) before income taxes	58,145		(15,483)
Income tax (expense) benefit	(13,573)		6,969
Net income (loss)	$	44,572	$	(8,514)
Less: Net loss attributable to non-controlling interest	(76)		(121)
Net income (loss) attributable to U.S. Silica Holdings, Inc.	$	44,648	$	(8,393)
Earnings (loss) per share attributable to U.S. Silica Holdings, Inc.:
Basic	$	0.58	$	(0.11)
Diluted	$	0.57	$	(0.11)
Weighted average shares outstanding:
Basic	76,517		75,240
Diluted	78,292		75,240
Dividends declared per share	$	—	$	—

The accompanying notes are an integral part of these financial statements.

3

U.S. SILICA HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(Unaudited; dollars in thousands)

	Three Months Ended   March 31,
	2023		2022
Net income (loss)	$	44,572	$	(8,514)
Other comprehensive income:
Unrealized loss on derivatives (net of tax of $(309) and $0 for the three months ended March 31, 2023 and 2022, respectively)	(969)		—
Foreign currency translation adjustment (net of tax of $71 and $(98) for the three months ended March 31, 2023 and 2022, respectively)	222		(309)
Pension and other post-retirement benefits liability adjustment (net of tax of $7 and $1,084 for the three months ended March 31, 2023 and 2022, respectively)	22		3,462
Comprehensive income (loss)	$	43,847	$	(5,361)
Less: Comprehensive loss attributable to non-controlling interest	(76)		(121)
Comprehensive income (loss) attributable to U.S. Silica Holdings, Inc.	$	43,923	$	(5,240)

The accompanying notes are an integral part of these financial statements.

4

U.S. SILICA HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(Unaudited; dollars in thousands, except per share amounts)

	Common Stock		Treasury Stock		Additional Paid-In Capital		Retained Deficit		Accumulated Other Comprehensive (Loss) Income		Total U.S. Silica Holdings Inc., Stockholders’ Equity		Non-controlling Interest		Total Stockholders’ Equity
Balance at December 31, 2022	$	854	$	(186,196)	$	1,234,834	$	(351,084)	$	(1,723)	$	696,685	$	8,009	$	704,694
Net income (loss)	—		—		—		44,648		—		44,648		(76)		44,572
Unrealized loss on derivatives	—		—		—		—		(969)		(969)		—		(969)
Foreign currency translation adjustment	—		—		—		—		222		222		—		222
Pension and post-retirement liability	—		—		—		—		22		22		—		22
Distributions to non-controlling interest	—		—		—		—		—		—		(350)		(350)
Common stock-based compensation plans activity:
Equity-based compensation	—		—		3,286		—		—		3,286		—		3,286
Tax payments related to shares withheld for vested restricted stock and stock units	22		(9,920)		(22)		—		—		(9,920)		—		(9,920)
Balance at March 31, 2023	$	876	$	(196,116)	$	1,238,098	$	(306,436)	$	(2,448)	$	733,974	$	7,583	$	741,557
Balance at December 31, 2021	$	845	$	(186,294)	$	1,218,575	$	(429,260)	$	349	$	604,215	$	9,868	$	614,083
Net loss	—		—		—		(8,393)		—		(8,393)		(121)		(8,514)
Foreign currency translation adjustment	—		—		—		—		(309)		(309)		—		(309)
Pension and post-retirement liability	—		—		—		—		3,462		3,462		—		3,462
Cash dividends	—		—		—		12		—		12		—		12
Distributions to non-controlling interest	—		—		—		—		—		—		(353)		(353)
Common stock-based compensation plans activity:
Equity-based compensation	—		—		4,382		—		—		4,382		—		4,382
Proceeds from options exercised	—		254		(171)		—		—		83		—		83
Tax payments related to shares withheld for vested restricted stock and stock units	6		(2,052)		(6)		—		—		(2,052)		—		(2,052)
Balance at March 31, 2022	$	851	$	(188,092)	$	1,222,780	$	(437,641)	$	3,502	$	601,400	$	9,394	$	610,794

The accompanying notes are an integral part of these financial statements.

5

U.S. SILICA HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited; dollars in thousands)

	Three Months Ended   March 31,
	2023		2022
Operating activities:
Net income (loss)	$	44,572	$	(8,514)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization	35,386		37,749
Debt issuance amortization	1,131		1,253
Original issue discount amortization	220		255
Deferred income taxes	8,899		(15,312)
Deferred revenue	(5,569)		(873)
Loss (gain) on disposal of property, plant and equipment	264		(375)
Equity-based compensation	3,286		4,382
Allowance for credit losses, net of recoveries	(186)		286
Other	8,024		8,329
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(17,578)		4,088
Inventories	(4,763)		(7,882)
Prepaid expenses and other current assets	3,657		3,493
Income taxes	4,308		7,666
Accounts payable and accrued expenses	(32,709)		(5,197)
Operating lease liabilities	(6,503)		(7,518)
Liability for pension and other post-retirement benefits	(433)		(4,740)
Other noncurrent assets and liabilities	(1,104)		(2,011)
Net cash provided by operating activities	40,902		15,079
Investing activities:
Capital expenditures	(18,929)		(7,030)
Capitalized intellectual property costs	(107)		(67)
Proceeds from sale of property, plant and equipment	105		714
Net cash used in investing activities	(18,931)		(6,383)
Financing activities:
Dividends paid	(1)		(151)
Proceeds from options exercised	—		83
Tax payments related to shares withheld for vested restricted stock and stock units	(9,920)		(2,052)
Payments on short-term debt	(2,814)		(2,212)
Payments on long-term debt	(109,062)		(3,338)
Financing fees paid	(40,949)		—
Distributions to non-controlling interest	(350)		(353)
Principal payments on finance lease obligations	(226)		(330)
Net cash used in financing activities	(163,322)		(8,353)
Net (decrease) increase in cash and cash equivalents	(141,351)		343
Cash and cash equivalents, beginning of period	280,845		239,425
Cash and cash equivalents, end of period	$	139,494	$	239,768

6

U.S. SILICA HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Continued)

(Unaudited; dollars in thousands)

	Three Months Ended   March 31,
	2023		2022
Supplemental cash flow information:
Cash paid (received) during the period for:
Interest	$	21,401	$	15,702
Taxes, net of refunds	$	354	$	(20,403)
Non-cash items:
Accrued capital expenditures	$	4,793	$	121

The accompanying notes are an integral part of these financial statements.

7

U.S. SILICA HOLDINGS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited; dollars in thousands, except per share amounts)

NOTE A—ORGANIZATION AND BASIS OF PRESENTATION

Organization

U.S. Silica Holdings, Inc. (“Holdings,” and together with its subsidiaries “we,” “us” or the “Company”) is a global performance materials company and a leading producer of commercial silica used in the oil and gas industry and in a wide range of industrial applications. In addition, through our subsidiary EP Minerals, LLC ("EPM"), we are an industry leader in the production of industrial minerals, including diatomaceous earth, clay (calcium bentonite and calcium montmorillonite) and perlite. During our 123-year history, we have developed core competencies in mining, processing, logistics and materials science that enable us to produce and cost-effectively deliver products to customers across our end markets. Our operations are organized into two reportable segments based on end markets served: (1) Oil & Gas Proppants and (2) Industrial & Specialty Products. See Note T - Segment Reporting for more information on our reportable segments.

Basis of Presentation and Consolidation

The accompanying unaudited Condensed Consolidated Financial Statements for the quarter ended March 31, 2023 included in this Quarterly Report on Form 10-Q have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X issued by the U.S. Securities and Exchange Commission (“SEC”). They do not contain certain information included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2022; therefore, the unaudited Condensed Consolidated Financial Statements should be read in conjunction with that Annual Report on Form 10-K. Operating results for the three-month period ended March 31, 2023 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2023. In the opinion of management, all adjustments necessary for a fair presentation have been included. Such adjustments are of a normal, recurring nature.

The unaudited Condensed Consolidated Financial Statements include the accounts of Holdings and its direct and indirect wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.

Throughout this report we refer to (i) our unaudited Condensed Consolidated Balance Sheets as our “Balance Sheets,” (ii) our unaudited Condensed Consolidated Statements of Operations as our “Income Statements,” and (iii) our unaudited Condensed Consolidated Statements of Cash Flows as our “Cash Flows.”

NOTE B—SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Use of Estimates and Assumptions

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the related disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. The areas requiring the use of management estimates and assumptions relate to the purchase price allocation for businesses acquired; mineral reserves that are the basis for future cash flow estimates utilized in impairment calculations and units-of-production amortization calculations; environmental, reclamation and closure obligations; estimates of recoverable minerals; estimates of allowance for credit losses; estimates of fair value for certain reporting units and asset impairments (including impairments of goodwill, intangible assets and other long-lived assets); write-downs of inventory to net realizable value; equity-based compensation expense; post-employment, post-retirement and other employee benefit liabilities; valuation allowances for deferred tax assets; contingent considerations; reserves for contingencies and litigation and the fair value and accounting treatment of financial instruments. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Accordingly, actual results may differ significantly from these estimates under different assumptions or conditions.

New Accounting Pronouncements Recently Adopted

None.

8

New Accounting Pronouncements Not Yet Adopted

In March 2020, the FASB issued Accounting Standards Update ("ASU") 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting followed by ASU 2021-01, Reference Rate Reform (Topic 848): Scope, issued in January 2021 to provide clarifying guidance regarding the scope of Topic 848. ASU 2020-04 was issued to provide optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. Generally, the guidance is to be applied as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020, or prospectively from a date within an interim period that includes or is subsequent to March 12, 2020, up to the date that the financial statements are available to be issued. ASU 2020-04 and ASU 2021-01 are effective for all entities through December 31, 2022. In April 2022, the FASB proposed to extend the effective date through December 31, 2024 and affirmed this decision in December 2022. Upon execution of the Fourth Amendment to our Credit Agreement, we have transitioned from LIBOR. See Note I - Debt for discussion of the Fourth Amendment of the Credit Agreement.

NOTE C—EARNINGS PER SHARE

Basic earnings per common share is computed by dividing income available to common stockholders by the weighted average number of common shares outstanding for the period. Diluted earnings per common share is computed similarly to basic earnings per common share except that the weighted average number of common shares outstanding is increased to include the number of additional common shares that would have been outstanding if the potentially dilutive common shares had been issued.

Diluted net earnings per share assumes the conversion of contingently convertible securities and stock options under the treasury stock method, if dilutive. Contingently convertible securities and stock options are excluded from the calculation of fully diluted earnings per share if they are anti-dilutive, including when we incur a loss from continuing operations. 

The following table shows the computation of basic and diluted earnings per share:

In thousands, except per share amounts	Three Months Ended   March 31,
	2023		2022
Numerator:
Net income (loss) attributable to U.S. Silica Holdings, Inc.	$	44,648	$	(8,393)
Denominator:
Weighted average shares outstanding	76,517		75,240
Diluted effect of stock awards	1,775		—
Weighted average shares outstanding assuming dilution	78,292		75,240
Earnings (loss) per share attributable to U.S. Silica Holdings, Inc.:
Basic earnings (loss) per share	$	0.58	$	(0.11)
Diluted earnings (loss) per share	$	0.57	$	(0.11)

9

Potentially dilutive shares are excluded from the calculation of diluted weighted average shares outstanding and diluted earnings per share if we are in a net loss position. Certain stock options, restricted stock awards and performance share units were excluded from the computation of diluted earnings per share because their effect would have been anti-dilutive. Such potentially dilutive shares and stock awards excluded from the calculation of diluted earnings per common share were as follows:

In thousands	Three Months Ended   March 31,
	2023	2022
Potentially dilutive shares excluded	—	1,808
Stock options excluded	445	541
Restricted stock and performance share unit awards excluded	50	12

NOTE D—ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

Accumulated other comprehensive income (loss) consists of fair value adjustments associated with accumulated adjustments for net experience losses and prior service costs related to employee benefit plans and foreign currency translation adjustments, net of tax. The following table presents the changes in accumulated other comprehensive income (loss) by component (in thousands):

	For the Three Months Ended March 31, 2023
	Unrealized loss on natural gas swaps		Foreign currency translation adjustments		Pension and other post-retirement benefits liability		Total
Beginning Balance	$	(2,342)	$	(1,262)	$	1,881	$	(1,723)
Other comprehensive (loss) income before reclassifications	(969)		222		511		(236)
Amounts reclassified from accumulated other comprehensive income	—		—		(489)		(489)
Ending Balance	$	(3,311)	$	(1,040)	$	1,903	$	(2,448)

Any amounts reclassified from accumulated other comprehensive income (loss) related to pension and other post-retirement benefits are included in the computation of net periodic benefit costs at their pre-tax amounts.

NOTE E—ACCOUNTS RECEIVABLE

Accounts receivable are recorded when billed or accrued and represent claims against third parties that will be settled in cash. The carrying value of our accounts receivable, net of the allowance for credit losses, represents their estimated net realizable value. Accounts receivable (in thousands) consisted of the following:

	March 31, 2023		December 31, 2022
Trade receivables	$	227,488	$	209,683
Less: Allowance for credit losses	(5,445)		(5,691)
Net trade receivables	222,043		203,992
Other receivables	4,352		4,639
Total accounts receivable	$	226,395	$	208,631

We classify our trade receivables into the following portfolio segments: Oil & Gas Proppants and Industrial & Specialty Products, which also aligns with our reporting segments. We estimate the allowance for credit losses based on historical collection trends, the age of outstanding receivables, risks attributable to specific customers, such as credit history, bankruptcy or other going concern issues, and current economic and industry conditions. If events or circumstances indicate that specific receivable balances may be impaired, further consideration is given to the collectability of those balances and the allowance is adjusted accordingly. Past due balances are written off when we have exhausted our internal and external collection efforts and have been unsuccessful in collecting the amount due.

10

The following table reflects the change of the allowance for credit losses (in thousands):

	Oil & Gas Proppants		Industrial & Specialty Products		Total
Beginning balance, December 31, 2022	$	4,028	$	1,663	$	5,691
Allowance for credit losses	—		(186)		(186)
Write-offs	—		(60)		(60)
Ending balance, March 31, 2023	$	4,028	$	1,417	$	5,445

Our ten largest customers accounted for 45% and 40% of total sales for the three months ended March 31, 2023 and 2022, respectively. No customers accounted for 10% or more of our total sales for the three months ended March 31, 2023 or 2022. At March 31, 2023 and December 31, 2022, none of our customers' accounts receivable represented 10% or more of our total trade accounts receivable.

NOTE F—INVENTORIES

Inventories (in thousands) consisted of the following:

	March 31, 2023		December 31, 2022
Supplies	$	59,743	$	54,805
Raw materials and work in process	49,563		47,042
Finished goods	43,113		45,779
Total inventories	$	152,419	$	147,626

NOTE G—PROPERTY, PLANT AND MINE DEVELOPMENT

Property, plant and mine development (in thousands) consisted of the following:

	March 31, 2023		December 31, 2022
Mining property and mine development	$	790,532	$	789,601
Asset retirement cost	8,869		8,869
Land	53,128		53,128
Land improvements	83,060		76,456
Buildings	76,321		73,151
Machinery and equipment	1,232,641		1,217,933
Furniture and fixtures	3,922		3,922
Construction-in-progress	43,389		55,696
	2,291,862		2,278,756
Accumulated depreciation, depletion, amortization and impairment charges	(1,130,612)		(1,099,922)
Total property, plant and mine development, net	$	1,161,250	$	1,178,834

Depreciation, depletion, and amortization expense related to property, plant and mine development was $32.3 million and $34.8 million for the three months ended March 31, 2023 and 2022, respectively.

11

NOTE H—GOODWILL AND INTANGIBLE ASSETS

The changes in the carrying amount of goodwill (in thousands) by business segment consisted of the following:

	Oil & Gas Proppants Segment		Industrial & Specialty Products Segment		Total
Balance at December 31, 2022	$	—	$	185,649	$	185,649
Impairment loss	—		—		—
Balance at March 31, 2023	$	—	$	185,649	$	185,649

Goodwill and trade names are evaluated for impairment annually as of October 31, or more frequently when indicators of impairment exist. We evaluated events and circumstances since the date of our last qualitative assessment, including macroeconomic conditions, industry and market conditions, and our overall financial performance. There were no triggering events during the first three months of 2023, therefore, no impairment charges were recorded related to goodwill or trade names for the three months ended March 31, 2023.

The changes in the carrying amount of intangible assets (in thousands) consisted of the following:

	March 31, 2023						December 31, 2022
	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
Technology and intellectual property	$	71,718	$	(31,214)	$	40,504	$	71,651	$	(29,990)	$	41,661
Customer relationships	66,999		(33,991)		33,008		66,999		(32,791)		34,208
Total definite-lived intangible assets:	$	138,717	$	(65,205)	$	73,512	$	138,650	$	(62,781)	$	75,869
Trade names	64,240		—		64,240		64,240		—		64,240
Other	700		—		700		700		—		700
Total intangible assets:	$	203,657	$	(65,205)	$	138,452	$	203,590	$	(62,781)	$	140,809

Estimated useful life of technology and intellectual property is 15 years. Estimated useful life of customer relationships is a range of 13 - 20 years.

Amortization expense was $2.4 million for both the three months ended March 31, 2023 and 2022.

The estimated amortization expense related to definite-lived intangible assets (in thousands) for the five succeeding years is as follows:

2023 (remaining nine months)	$	7,277
2024	$	9,702
2025	$	9,701
2026	$	9,701
2027	$	9,701

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NOTE I—DEBT

Debt (in thousands) consisted of the following:

	March 31, 2023		December 31, 2022
Senior secured credit facility:
Revolver expiring March 23, 2028 (9.63% at March 31, 2023 and 8.44% at December 31, 2022)	$	—	$	—
Term Loan—final maturity March 23, 2030 (9.63% at March 31, 2023 and 8.44% at December 31, 2022)	950,000		1,059,062
Less: Unamortized original issue discount	(29,510)		(2,035)
Less: Unamortized debt issuance cost	(15,729)		(8,922)
Insurance financing notes payable	2,814		5,628
Finance leases (See Note P - Leases)	3,028		3,260
Total debt	910,603		1,056,993
Less: current portion	(13,590)		(19,535)
Total long-term portion of debt	$	897,013	$	1,037,458

Senior Secured Credit Facility

On March 23, 2023, we entered into a Fourth Amended and Restated Credit Agreement (the "Credit Agreement"), by entering into a new $1.1 billion senior secured credit facility, consisting of a $950 million Term Loan (the "Term Loan") and a $150 million revolving credit facility (the "Revolver") (collectively the "Credit Facility") that may also be used for swingline loans or letters of credit, and we may elect to increase the term loan or the revolving credit facility in accordance with the terms of the Credit Agreement. Borrowings under the Credit Agreement will bear interest at variable rates as determined at our election, based on the Term Secured Overnight Financing Rate ("SOFR") or a base rate, in each case, plus an applicable margin. In addition, under the Credit Agreement, we are required to pay a per annum commitment fee to revolving lenders and fees for letters of credit. The Credit Agreement is secured by substantially all of our assets and our domestic subsidiaries' assets and a pledge of the equity interests in such entities. The Term Loan matures on March 23, 2030, and the Revolver expires March 23, 2028. We capitalized $45.2 million in debt issuance costs and original issue discount as a result of the Credit Agreement. Additionally, as a result of the exit of certain lending parties, a portion of debt issuance and original discount costs were written off which resulted in additional expense of approximately $4.3 million. This was recorded as a loss on the extinguishment of debt, which was recorded in Other (expense) income, net, including interest income in the Condensed Consolidated Statements of Operations.

The Credit Facility contains covenants that, among other things, limit our ability, and certain of our subsidiaries' abilities, to create, incur or assume indebtedness and liens, to make acquisitions or investments, to sell assets and to pay dividends. The Credit Agreement also requires us to maintain a consolidated leverage ratio of no more than 4.00:1.00 as of the last day of any fiscal quarter whenever usage of the Revolver (other than certain undrawn letters of credit) exceeds 2.85:1.00, or 35%, of the Revolver commitment. These covenants are subject to a number of important exceptions and qualifications. The Credit Agreement includes events of default and other affirmative and negative covenants that are usual for facilities and transactions of this type. As of March 31, 2023 and December 31, 2022, we were in compliance with all covenants in accordance with our senior secured Credit Facility.

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Term Loan

At March 31, 2023, contractual maturities of our Term Loan (in thousands) are as follows:

2023 (remaining nine months)	$	7,125
2024	9,500
2025	9,500
2026	9,500
2027	9,500
Thereafter	904,875
Total	$	950,000

Prior to the execution of the Fourth Amendment to the Credit Agreement, we repurchased outstanding debt under the Term Loan in the amount of $109 million. A proportionate share of debt issuance and original discount costs were written off in conjunction with this repurchase which resulted in additional expense of approximately $1.0 million. As a result, we recorded a loss on extinguishment of debt in the amount of $1.0 million. The loss on extinguishment was recorded in Other (expense) income, net, including interest income in the Condensed Consolidated Statements of Operations.

Revolving Line-of-Credit

We have a $150.0 million Revolver with zero drawn and $21.3 million allocated for letters of credit as of March 31, 2023, leaving $128.7 million available under the Revolver.

Based on our consolidated leverage ratio of 2.14:1.00 as of March 31, 2023, we may draw up to approximately $52.6 million without the consent of our lenders. With the consent of our lenders, we have access to the full availability of the Revolver.

Insurance Financing Notes Payable

During the third quarter of 2022, we renewed our insurance policies and financed the payments through notes payable with a stated interest rate of 6.0%. These payments will be made in installments throughout a nine-month period and, as such, have been classified as current debt. As of March 31, 2023, the notes payable had a balance of $2.8 million.

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NOTE J—ASSET RETIREMENT OBLIGATIONS

Mine reclamation or future remediation costs for inactive mines are accrued based on management’s best estimate at the end of each period of the costs expected to be incurred at such site at the expected abandonment date. Such cost estimates include, where applicable, ongoing care, maintenance and monitoring costs. Changes in estimates at inactive mines are reflected in earnings in the period an estimate is revised. Liabilities related to our asset retirement obligations are reflected in other long-term liabilities on our balance sheets. Changes in the asset retirement obligations (in thousands) are as follows:

	Three Months Ended   March 31,
	2023		2022
Beginning balance	$	20,732	$	32,049
Accretion	512		374
Additions and revisions of estimates	—		(3,126)
Payments	(14)		—
Ending balance	$	21,230	$	29,297

NOTE K—FAIR VALUE ACCOUNTING

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:

    Level 1—Quoted prices in active markets for identical assets or liabilities.

    Level 2—Observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

    Level 3—Inputs that are generally unobservable and typically reflect management’s estimate of assumptions that market participants would use in pricing the asset or liability.

Cash Equivalents

Due to the short-term maturity, we believe our cash equivalent instruments approximated their reported carrying values, therefore we have classified our cash equivalents as Level 1 of the fair value hierarchy.

Long-Term Debt, Including Current Maturities

The fair values of our long-term debt, including current maturities, approximated their carrying values based on their effective interest rates compared to current market rates, therefore we have classified our long-term debt as Level 1 of the fair value hierarchy.

Derivative Instruments

The estimated fair value of our derivative instruments is recorded at each reporting period and is determined based on inputs that are readily available in public markets or can be derived from information available in publicly quoted markets. Therefore, we have classified these swap agreements as Level 2 of the fair value hierarchy.

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NOTE L—DERIVATIVE INSTRUMENTS

Cash Flow Hedges of Natural Gas Price Risk

Natural gas is the primary fuel source used for drying in the commercial silica production process. In the past, the price of natural gas has been volatile, and we believe this volatility may continue. In order to manage our exposure to natural gas price increases, we entered into natural gas swaps. The derivative instruments are recorded on the balance sheet within other current or long-term assets or liabilities based on maturity dates at their fair values. As of March 31, 2023, the fair value of our natural gas swaps was a liability of $4.3 million, of which $3.5 million was classified within accounts payable and accrued liabilities on our balance sheet and $0.8 million was classified within other long-term obligations on our balance sheet. At December 31, 2022, the fair value of our natural gas swaps was a liability of $3.1 million, of which $2.3 million was classified within accounts payable and accrued liabilities on our balance sheet and $0.8 million was classified within other long-term obligations on our balance sheet.

We designated the natural gas swap agreements as qualified cash flow hedges. Accordingly, the effective portion of the gain or loss on the derivative instrument was reported as a component of other comprehensive income and recognized in earnings in the same period or periods during which the hedged transaction affects earnings.

The following table summarizes the fair values of our derivative instruments (in thousands, except contract/notional amount). See Note K - Fair Value Accounting for more information regarding the estimated fair values of our derivative instruments.

	March 31, 2023						December 31, 2022
	Maturity Date	Contract/Notional Amount (MMBtu)	Carrying Amount		Fair Value		Maturity Date	Contract/Notional Amount (MMBtu)	Carrying Amount		Fair Value
Natural Gas - W. Texas (WAHA) - Inside FERC	2023	1,200,000	$	(2,113)	$	(2,113)	2023	1,200,000	$	(1,887)	$	(1,887)
Natural Gas - W. Texas (WAHA) - Inside FERC	2024	870,000	$	(932)	$	(932)	2024	870,000	$	(656)	$	(656)
Natural Gas - W. Texas (WAHA) - Inside FERC	2024	750,000	$	(481)	$	(481)	N/A	N/A	$	—	$	—
Natural Gas - Henry Hub - NYMEX	2023	300,000	$	(618)	$	(618)	2023	300,000	$	(425)	$	(425)
Natural Gas - Henry Hub - NYMEX	2024	120,000	$	(167)	$	(167)	2024	120,000	$	(85)	$	(85)
Natural Gas - Henry Hub - NYMEX	2025	90,000	$	(54)	$	(54)	2025	90,000	$	(35)	$	(35)

During the three months ended March 31, 2023, we had no ineffectiveness for the natural gas swap derivatives.

The following table summarizes the effect of derivative instruments (in thousands) on our income statements and our consolidated statements of comprehensive income:

	Three Months Ended   March 31,
	2023		2022
Deferred losses from derivatives in OCI, beginning of period	$	(2,342)	$	—
Loss recognized in OCI from derivative instruments	(969)		—
Deferred losses from derivatives in OCI, end of period	$	(3,311)	$	—

NOTE M—EQUITY-BASED COMPENSATION

In July 2011, we adopted the U.S. Silica Holdings, Inc. 2011 Incentive Compensation Plan (the “2011 Plan”), which was amended and restated effective May 2015, amended and restated effective February 1, 2020, amended and restated effective May 13, 2021 and amended and restated effective May 12, 2022. The 2011 Plan provides for grants of stock options, restricted stock, performance share units and other incentive-based awards. We believe our 2011 Plan aligns the interests of our employees and directors with those of our common stockholders. We use a combination of treasury stock and new shares, if necessary, to satisfy option exercises or vesting of restricted awards and performance share units.

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Stock Options

The following table summarizes the status of, and changes in, our stock option awards during the three months ended March 31, 2023:

	Number of Shares	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term in Years
Outstanding at December 31, 2022	508,523	$	36.22	2.0 years
Granted	—	$	—
Exercised	—	$	—
Forfeited	(48,857)	$	37.65
Expired	(15,000)	$	23.06
Outstanding at March 31, 2023	444,666	$	36.51	1.8 years
Exercisable at March 31, 2023	444,666	$	36.51	1.8 years

There were no grants of stock options during the three months ended March 31, 2023 and 2022.

The following table summarizes stock option exercise activity:

	Three months ended March 31,
	2023		2022
Options exercised (in actual shares)	—		7,500
Intrinsic value of options exercised (in thousands)	$	—	$	25
Cash received from options exercised (in thousands)	$	—	$	83
Tax benefit realized from options exercised (in thousands)	$	—	$	6

As of March 31, 2023 and 2022, there was no unrecognized compensation expense related to these options. We account for forfeitures as they occur.

Restricted Stock and Restricted Stock Unit Awards

The following table summarizes the status of, and changes in, our unvested restricted stock awards during the three months ended March 31, 2023:

	Number of Shares	Grant Date Weighted Average Fair Value
Unvested, December 31, 2022	1,438,386	$	9.37
Granted	493,934	$	11.97
Vested	(613,378)	$	8.25
Forfeited	(74,446)	$	7.13
Unvested, March 31, 2023	1,244,496	$	11.09

We granted 493,934 and 588,492 restricted stock and restricted stock unit awards during the three months ended March 31, 2023 and 2022, respectively. The fair value of the awards was based on the market price of our stock at date of grant.

We recognized $1.6 million of equity-based compensation expense related to restricted stock and restricted stock units during both the three months ended March 31, 2023 and 2022. As of March 31, 2023, there was $11.9 million of unrecognized compensation expense related to these restricted stock and restricted stock units, which is expected to be recognized over a weighted-average period of 2.2 years.

We also granted cash awards during the three months ended March 31, 2020. These awards vested over a period of three years and were settled in cash. As such, these awards were classified as liability instruments. We recognized $0.3 million of

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expense related to these awards for both the three months ended March 31, 2023 and 2022. The liability for these awards was included in accounts payable and other accrued expenses on our balance sheets. These awards were remeasured at fair value each reporting period with resulting changes reflected in our income statements. As of March 31, 2023, there was no unrecognized expense related to these awards.

Performance Share Unit Awards

The following table summarizes the status of, and changes in, our performance share unit awards during the three months ended March 31, 2023:

	Number of Shares	Grant Date Weighted Average Fair Value
Unvested, December 31, 2022	2,292,751	$	9.51
Granted	1,289,980	$	9.53
Vested	(1,549,033)	$	6.60
Forfeited/Cancelled	(60,210)	$	11.21
Unvested, March 31, 2023	1,973,488	$	11.75

We granted 1,289,980 and 920,681 performance share unit awards during the three months ended March 31, 2023 and 2022, respectively. A portion of these awards was measured against total shareholder return ("TSR"), and a portion was measured against adjusted free cash flow ("ACF") targets. The grant date weighted average fair value of these awards was estimated to be $9.53 and $11.79 for the three months ended March 31, 2023 and 2022, respectively.

The number of TSR measured units that will vest will depend on the percentage ranking of our TSR compared to the TSR for each of the companies in the peer group over the three year period from January 1, 2023 through December 31, 2025 for the 2023 grant, January 1, 2022 through December 31, 2024 for the 2022 grant, and January 1, 2021 through December 31, 2023 for the 2021 grant. The number of ACF measured units that will vest will be based on ACF achievement versus target. The ACF targets are set annually and are approved by the Board of Directors. The related compensation expense is recognized on a straight-line basis over the vesting period.

The grant date fair value for the TSR awards was estimated using a Monte Carlo simulation model. The Monte Carlo simulation model requires the use of highly subjective assumptions. Our key assumptions in the model included the price and the expected volatility of our common stock and our self-determined peer group companies’ stock, risk-free rate of interest, dividend yields and cross-correlations between our common stock and our self-determined peer group companies' stock.

We recognized $1.7 million and $2.8 million of compensation expense related to performance share unit awards during the three months ended March 31, 2023 and 2022, respectively. As of March 31, 2023, there was $14.3 million of unrecognized compensation expense related to these performance share unit awards, which is expected to be recognized over a weighted-average period of 2.2 years.

We also granted cash awards during the three months ended March 31, 2020. These awards vested over a period of three years and were settled in cash. As such, these awards were classified as liability instruments. We recognized $0.1 million and $0.2 million of expense related to these awards for the three months ended March 31, 2023 and 2022, respectively. The liability for these awards was included in accounts payable and other accrued expenses on our balance sheets. These awards were remeasured at fair value each reporting period with resulting changes reflected in our income statements. As of March 31, 2023, there was no unrecognized expense related to these awards.

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NOTE N—COMMITMENTS AND CONTINGENCIES

Future Minimum Annual Commitments at March 31, 2023 (in thousands):

	Minimum Purchase Commitments
2023 (remaining nine months)	$	7,450
2024	4,784
2025	3,375
2026	2,293
2027	1,867
Thereafter	7,484
Total future purchase commitments	$	27,253

Minimum Purchase Commitments

We enter into service agreements with our transload and transportation service providers. Some of these agreements require us to purchase a minimum amount of services over a specific period of time. Any inability to meet these minimum contract requirements requires us to pay a shortfall fee, which is based on the difference between the minimum amount contracted for and the actual amount purchased.

Contingent Liability on Royalty Agreement

On May 17, 2017, we purchased reserves in Crane County, Texas, for $94.4 million cash plus contingent consideration. The contingent consideration is a royalty that is based on the tonnage shipped to third-parties. Because the contingent consideration is dependent on future tonnage sold, the amounts of which are uncertain, it is not currently possible to estimate the fair value of these future payments. The contingent consideration will be capitalized at the time a payment is probable and reasonably estimable, and the related depletion expense will be adjusted prospectively.

Other Commitments and Contingencies

Our operating subsidiary, U.S. Silica Company (“U.S. Silica”), has been named as a defendant in various product liability claims alleging silica exposure causing silicosis. During the three months ended March 31, 2023, no new claims were brought against U.S. Silica. As of March 31, 2023, there were 42 active silica-related product liability claims pending in which U.S. Silica is a defendant. Although the outcomes of these claims cannot be predicted with certainty, in the opinion of management, it is not reasonably possible that the ultimate resolution of these matters will have a material adverse effect on our financial position or results of operations that exceeds the accrual amounts.

We have recorded estimated liabilities for these claims in other long-term liabilities as well as estimated recoveries under the indemnity agreement and an estimate of future recoveries under insurance in other assets on our consolidated balance sheets. For both March 31, 2023 and December 31, 2022, other non-current assets included zero for insurance for third-party product liability claims. As of March 31, 2023 and December 31, 2022 other long-term liabilities included $0.7 million and $0.8 million, respectively, for third-party product liability claims.

Obligations under Guarantees

We have indemnified our insurers against any loss they may incur in the event that holders of surety bonds, issued on our behalf, execute the bonds. As of March 31, 2023, there was $42.6 million in bonds outstanding, of which $38.6 million related to reclamation requirements issued by various governmental authorities. Reclamation bonds remain outstanding until the mining area is reclaimed and the authority issues a formal release. The remaining bonds relate to licenses, permits, and tax collection.

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NOTE O—PENSION AND POST-RETIREMENT BENEFITS

We maintain a single-employer noncontributory defined benefit pension plan covering certain employees. The plan is frozen to all new employees. The plan provides benefits based on each covered employee’s years of qualifying service. Our funding policy is to contribute amounts within the range of the minimum required and maximum deductible contributions for the plan consistent with a goal of appropriate minimization of the unfunded projected benefit obligations. The pension plan uses a benefit level per year of service for covered hourly employees and a final average pay method for covered salaried employees. The plan uses the projected unit credit cost method to determine the actuarial valuation.

In addition, we provide defined benefit post-retirement health care and life insurance benefits to some employees. Covered employees become eligible for these benefits at retirement after meeting minimum age and service requirements. The projected future cost of providing post-retirement benefits, such as healthcare and life insurance, is recognized as an expense as employees render services. In general, retiree health benefits are paid as covered expenses are incurred. Expenses incurred other than service costs are reported in Other (expense) income in our Condensed Consolidated Statements of Operations.

Net pension benefit cost (in thousands) consisted of the following:

	Three Months Ended   March 31,
	2023		2022
Service cost	$	573	$	689
Interest cost	1,248		689
Expected return on plan assets	(1,519)		(1,418)
Net amortization and deferral	(2)		499
Net pension benefit costs	$	300	$	459

Net post-retirement benefit cost (in thousands) consisted of the following:

	Three Months Ended   March 31,
	2023		2022
Service cost	$	4	$	6
Interest cost	80		36
Unrecognized prior service cost	(516)		(516)
Unrecognized net (gain)/loss	(131)		(34)
Net post-retirement benefit income	(563)		$	(508)

We made no contributions to the qualified pension plan for the three months ended March 31, 2023 and 2022. Our best estimates of expected contributions to the pension and post-retirement medical benefit plans for the 2023 fiscal year are zero and $1.0 million, respectively.

We contribute to three multiemployer defined benefit pension plans under the terms of collective-bargaining agreements for union-represented employees. A multiemployer plan is subject to collective bargaining for employees of two or more unrelated companies. These plans allow multiple employers to pool their pension resources and realize efficiencies associated with the daily administration of the plan. Multiemployer plans are generally governed by a board of trustees composed of management and labor representatives and are funded through employer contributions. However, in most cases, management is not directly represented. Our contributions to individual multiemployer pension funds did not exceed 5% of the fund’s total contributions for the three months ended March 31, 2023 and 2022. Additionally, our contributions to multiemployer post-retirement benefit plans were immaterial for all periods presented in the accompanying condensed consolidated financial statements.

We also sponsor a defined contribution plan covering certain employees. We contribute to the plan in two ways. For certain employees not covered by the defined benefit plan, we make a contribution equal to 4% of their salary. For all other eligible employees, we make a contribution up to 6% of eligible earnings. Contributions were $2.1 million and $1.8 million for the three months ended March 31, 2023 and 2022, respectively.

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NOTE P— LEASES

We lease railroad cars, office space, mining property, mining/processing equipment and transportation and other equipment. The majority of our leases have remaining lease terms of approximately one year to 20 years. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. We have lease agreements with lease and non-lease components, the latter of which are generally accounted for separately.

Supplemental balance sheet information related to leases was as follows (in thousands, except lease term and discount rate):

Leases	Classification	March 31, 2023		December 31, 2022
Assets
Operating	Lease right-of-use assets	$	36,733	$	39,088
Finance	Lease right-of-use assets	3,085		3,286
Total leased assets		$	39,818	$	42,374
Liabilities
Current
Operating	Current portion of operating lease liabilities	$	19,101	$	19,773
Finance	Current portion of long-term debt	1,276		1,107
Non-current
Operating	Operating lease liabilities	60,135		64,478
Finance	Long-term debt, net	1,752		2,153
Total lease liabilities		$	82,264	$	87,511
Lease Term and Discount Rate
Weighted average remaining lease term:
Operating		6.2 years		6.4 years
Finance		4.5 years		4.4 years
Weighted average discount rate:
Operating		5.8%		5.7%
Finance		5.3%		5.1%

The components of lease expense (in thousands) were as follows:

Lease Costs	Classification	Three Months Ended   March 31, 2023		Three Months Ended   March 31, 2022
Operating lease costs(1)	Cost of sales	$	10,443	$	7,628
Operating lease costs(2)	Selling, general and administrative	595		354
Total (3)		$	11,038	$	7,982

(1) Included short-term operating lease costs of $6.8 million and $4.7 million for the three months ended March 31, 2023 and 2022, respectively.

(2) Included short-term operating lease costs of $0.3 million and $0.1 million for the three months ended March 31, 2023 and 2022, respectively.

(3) Not included were expenses for finance leases of $0.2 million and $0.4 million for the three months ended March 31, 2023 and 2022, respectively.

Supplemental cash flow information (in thousands) related to leases was as follows:

	Three Months Ended   March 31, 2023		Three Months Ended   March 31, 2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	6,503	$	7,518
Financing cash flows for finance leases	$	268	$	330
Right-of-use assets obtained in exchange for new lease liabilities:
Operating leases	$	472	$	1,188
Finance leases	$	—	$	2,102

Maturities of lease liabilities (in thousands) as of March 31, 2023:

	Operating leases		Finance leases
2023 (remaining nine months)	$	17,860	$	978
2024	20,350		1,123
2025	14,878		842
2026	11,919		271
2027	8,389		33
Thereafter	23,702		—
Total lease payments	$	97,098	$	3,247
Less: Interest	15,657		219
Less: Other operating expenses	2,205		—
Total	$	79,236	$	3,028

NOTE Q— INCOME TAXES

For interim period reporting, we record income taxes using an estimated annual effective tax rate based upon projected annual income, forecasted permanent tax differences, discrete items and statutory rates in states in which we operate. At the end of each interim period, we update the estimated annual effective tax rate, and if the estimated tax rate changes based on new information, we make a cumulative adjustment in the period. We record the tax effect of an unusual or infrequently occurring item in the interim period in which it occurs as a discrete item of tax.

For the three months ended March 31, 2023, we had tax expense of $13.6 million. For the three months ended March 31, 2022, we had a tax benefit of $7.0 million. The effective tax rates were 23% and 45% for the three months ended March 31, 2023 and 2022, respectively. Without discrete items, which primarily consist of tax expense related to equity compensation and non-US income taxes, the effective tax rates for the three months ended March 31, 2023 and 2022 would have been 26% and 48%, respectively.

During the three months ended March 31, 2023 and 2022, we recorded a tax benefit of $2.3 million and tax expense of $0.3 million, respectively, related to equity compensation.

Historically, our actual effective tax rates have differed from the statutory effective rate primarily due to the benefit received from statutory percentage depletion allowances. The deduction for statutory percentage depletion does not necessarily change proportionately to changes in income before income taxes. For the quarter ended March 31, 2023, the benefit received from statutory percentage depletion allowances was offset by nondeductible executive compensation and state income taxes.

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NOTE R— REVENUE

We consider sales disaggregated at the product and service level by business segment to depict how the nature, amount, timing and uncertainty of revenues and cash flow are impacted by changes in economic factors. The following table disaggregates our sales by major source (in thousands):

	Three Months Ended   March 31, 2023						Three Months Ended   March 31, 2022
Category	Oil & Gas Proppants		Industrial & Specialty Products		Total Sales		Oil & Gas Proppants		Industrial & Specialty Products		Total Sales
Product	$	201,787	$	142,227	$	344,014	$	104,591	$	128,643	$	233,234
Service	98,226		—		98,226		71,653		—		71,653
Total Sales	$	300,013	$	142,227	$	442,240	$	176,244	$	128,643	$	304,887

The following tables reflect the changes in our contract assets, which we classify as unbilled receivables and our contract liabilities, which we classify as deferred revenues, for the three months ended March 31, 2023 and 2022 (in thousands):

	Unbilled Receivables
	March 31, 2023		March 31, 2022
Beginning Balance	$	—	$	1,957
Reclassifications to billed receivables	—		(1,957)
Revenues recognized in excess of period billings	—		2,500
Ending Balance	$	—	$	2,500

	Deferred Revenue
	March 31, 2023		March 31, 2022
Beginning Balance	$	30,752	$	20,741
Revenues recognized from balances held at the beginning of the period	(5,569)		(1,653)
Revenues deferred from period collections on unfulfilled performance obligations	—		450
Revenues recognized from period collections	—		(404)
Ending Balance	$	25,183	$	19,134

We have elected to use the practical expedients allowed under ASC 606-10-50-14, pursuant to which we have excluded disclosures of transaction prices allocated to remaining performance obligations and when we expect to recognize such revenue. The majority of our remaining performance obligations are primarily comprised of unfulfilled product, transportation service, and labor service orders, all of which hold a remaining duration of less than one year. The long-term portion of deferred revenue primarily represents a combination of refundable and nonrefundable customer prepayments for which related current performance obligations do not yet exist, but are expected to arise, before the expiration of the contract. Our residual unfulfilled performance obligations are comprised primarily of long-term equipment rental arrangements in which we recognize revenues equal to what we have a right to invoice. Generally, no variable consideration exists related to our remaining performance obligations and no consideration is excluded from the associated transaction prices.

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Foreign Operations

The following table includes information related to our foreign operations (in thousands):

	Three Months Ended   March 31, 2023		Three Months Ended   March 31, 2022
Total Sales	$	29,932	$	25,254
Pre-tax income	$	6,902	$	4,813
Net income	$	5,452	$	3,802

Foreign operations constituted approximately $36.9 million and $34.2 million of consolidated assets as of March 31, 2023 and 2022, respectively.

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NOTE S— RELATED PARTY TRANSACTIONS

There were no related party transactions during the three months ended March 31, 2023 or 2022.

NOTE T— SEGMENT REPORTING

Our business is organized into two reportable segments, Oil & Gas Proppants and Industrial & Specialty Products, based on end markets. The reportable segments are consistent with how management views the markets that we serve and the financial information reviewed by the chief operating decision maker. We manage our Oil & Gas Proppants and Industrial & Specialty Products businesses as components of an enterprise for which separate information is available and is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and assess performance.

In the Oil & Gas Proppants segment, we serve the oil and gas recovery market primarily by providing and delivering fracturing sand, or “frac sand,” which is pumped down oil and natural gas wells to prop open rock fissures and increase the flow rate of oil and natural gas from the wells.

The Industrial & Specialty Products segment consists of over 600 product types and materials used in a variety of industries, including container glass, fiberglass, specialty glass, flat glass, building products, fillers and extenders, foundry products, chemicals, recreation products and filtration products.

An operating segment’s performance is primarily evaluated based on segment contribution margin, which excludes selling, general, and administrative costs, depreciation, depletion and amortization, corporate costs, plant capacity expansion expenses, and facility closure costs. We believe that segment contribution margin, as defined above, is an appropriate measure for evaluating the operating performance of our segments. However, segment contribution margin is a non-GAAP measure and should be considered in addition to, not a substitute for, or superior to, net income (loss) or other measures of financial performance prepared in accordance with GAAP. The other accounting policies of each of the two reportable segments are the same as those in Note B - Summary of Significant Accounting Policies to the Consolidated Financial Statements in Item 8 of our 2022 Annual Report on Form 10-K.

The following table presents sales and segment contribution margin (in thousands) for the reportable segments and other operating results not allocated to the reportable segments:

	Three Months Ended   March 31,
	2023		2022
Sales:
Oil & Gas Proppants	$	300,013	$	176,244
Industrial & Specialty Products	142,227		128,643
Total sales	442,240		304,887
Segment contribution margin:
Oil & Gas Proppants	109,897		44,753
Industrial & Specialty Products	42,929		37,834
Total segment contribution margin	152,826		82,587
Operating activities excluded from segment cost of sales	(3,719)		(4,569)
Selling, general and administrative	(29,163)		(40,110)
Depreciation, depletion and amortization	(35,386)		(37,749)
Interest expense	(24,061)		(17,173)
Other (expense) income, net, including interest income	(2,352)		1,531
Income tax (expense) benefit	(13,573)		6,969
Net income (loss)	$	44,572	$	(8,514)
Less: Net loss attributable to non-controlling interest	(76)		(121)
Net income (loss) attributable to U.S. Silica Holdings, Inc.	$	44,648	$	(8,393)

Asset information, including capital expenditures and depreciation, depletion, and amortization, by segment is not included in reports used by management in its monitoring of performance and, therefore, is not reported by segment. At both March 31, 2023 and December 31, 2022, goodwill of $185.6 million has been allocated to these segments with zero allocated to Oil & Gas Proppants and $185.6 million to Industrial & Specialty Products.

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NOTE U— SUBSEQUENT EVENTS

We evaluated subsequent events through the date the consolidated financial statements were available for issuance and did not identify any events requiring disclosure.

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

    

The following discussion and analysis of our financial condition and results of operations should be read together with the unaudited condensed consolidated financial statements and the accompanying notes included in Part I, Item 1 of this Quarterly Report on Form 10-Q as well as the consolidated financial statements, the accompanying notes and the related Management’s Discussion and Analysis of Financial Condition and Results of Operations (“MD&A”), contained in our Annual Report on Form 10-K for the fiscal year ended December 31, 2022 (the "2022 Annual Report").

Adjusted EBITDA and segment contribution margin as used herein are non-GAAP measures. For a detailed description of Adjusted EBITDA and segment contribution margin and reconciliations to their most comparable GAAP measures, please see the discussion below under “How We Evaluate Our Business.”

Forward Looking Statements

This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) and Section 27A of the Securities Act of 1933, as amended. All statements other than statements of historical fact included in this Quarterly Report on Form 10-Q are forward-looking statements. Forward-looking statements give our current expectations and projections relating to our financial condition, results of operations, plans, objectives, future performance and business. These statements may include words such as “anticipate,” “estimate,” “expect,” “project,” “plan,” “intend,” “believe,” “may,” “will,” “should,” “could,” “can have,” “likely” and other words and terms of similar meaning.

For example, all statements we make relating to our estimated and projected costs and cost reduction programs; the impact on our costs of heightened levels of inflation and rising interest rates; reserve and finished products estimates; demand for our products; the strategies of our customers; anticipated expenditures, cash flows, growth rates and financial results; our plans and objectives for future operations, growth or initiatives; strategies and their anticipated effect on our performance and liquidity; and the expected outcome or impact of pending or threatened litigation are forward-looking statements.

All forward-looking statements are subject to risks and uncertainties that may cause actual results to differ materially from those that we expect, including but not limited to: global economic conditions; fluctuations in demand for commercial silica, diatomaceous earth, perlite, clay and cellulose; fluctuations in demand for frac sand or the development of either effective alternative proppants or new processes to replace hydraulic fracturing; changes in production spending by companies in the oil and gas industry and changes in the level of oil and natural gas exploration and development; general economic, political and business conditions in key regions of the world including the ongoing conflict between Russia and Ukraine; ongoing effects of the COVID-19 pandemic on our customers and end users of our products; pricing pressure; weather and seasonal factors; the cyclical nature of our customers’ business; our inability to meet our financial and performance targets and other forecasts or expectations; our substantial indebtedness and pension obligations, including restrictions on our operations imposed by our indebtedness; operational modifications, delays or cancellations; prices for electricity, natural gas and diesel fuel; our ability to maintain our transportation network; changes in government regulations and regulatory requirements, including those related to mining, explosives, chemicals, and oil and gas production; silica-related health issues and corresponding litigation; and other risks and uncertainties detailed in this Quarterly Report on Form 10-Q and our most recent Forms 10-K, 10-Q, and 8-K filed with or furnished to the U.S. Securities and Exchange Commission (“SEC”).

We derive many of our forward-looking statements from our operating budgets and forecasts, which are based on many detailed assumptions. While we believe that our assumptions are reasonable, we caution that it is very difficult to predict the impact of the known factors described above, and it is impossible for us to anticipate all factors that could affect our actual results. As a result, forward-looking statements are not guarantees of future performance, and you should not place undue reliance on any forward-looking statements we make. If one or more of the risks described above or other risks or uncertainties materialize (or the consequences of any such development changes), or should our underlying assumptions prove incorrect, actual outcomes may vary materially from those reflected in our forward-looking statements. The forward-looking statements

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included in this Quarterly Report on Form 10-Q are made only as of the date hereof. We disclaim any intention or obligation to update publicly or revise such statements, whether as a result of new information, future events or otherwise. All 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 as well as other cautionary statements that are made from time to time in our other filings with the SEC, and our other public communications.

Overview

We are a global performance materials company and a leading producer of commercial silica used in the oil and gas industry and in a wide range of industrial applications. In addition, through our subsidiary EP Minerals, LLC ("EPM"), we are an industry leader in the production of industrial minerals, including diatomaceous earth, clay (calcium bentonite and calcium montmorillonite) and perlite.

During our 123-year history, we have developed core competencies in mining, processing, logistics and materials science that enable us to produce and cost-effectively deliver over 600 diversified product types to customers across our end markets. As of March 31, 2023, we had 27 operating mines and processing facilities and two additional exploration stage properties across the United States. We control 462 million tons of reserves of commercial silica, which we believe can be processed to make 180 million tons of finished products that meet API frac sand specifications, and 82 million tons of reserves of diatomaceous earth, perlite, and clays.

Our operations are organized into two reportable segments based on end markets served and the manner in which we analyze our operating and financial performance: (1) Oil & Gas Proppants and (2) Industrial & Specialty Products. We believe our segments are complementary because our ability to sell to a wide range of customers across end markets in these segments allows us to maximize recovery rates in our mining operations and optimize our asset utilization.

Recent Trends and Outlook

Oil and gas proppants end market trends

Our operations in our Oil & Gas Proppants segment are materially dependent on the levels of activity in natural gas and oil exploration, development and production, which are affected by trends in natural gas and oil prices. In recent years, natural gas and oil prices and, therefore, the level of exploration, development and production activity, have experienced significant volatility.

During 2020, the COVID-19 pandemic and related economic repercussions, coupled with an inadequate supply response and exacerbated by the lack of global storage capacity, resulted in a precipitous decline in crude oil prices. Demand for our proppant and logistics services declined as our customers reduced their capital spending budgets and drilling and completion operations in response to lower oil prices. Crude oil prices began to rebound from 2020 levels, with the West Texas Intermediate price of crude oil increasing 55% during 2021 and as much as 52% during 2022, though prices have declined slightly during 2023. This resulted in strong well completion activity and improved pricing for our Oil & Gas Proppants segment. Strong customer demand and favorable pricing in this segment have continued during 2023, offset in part by higher transportation and other costs.

The conflict between Russia and Ukraine has increased the disruption, instability and volatility in global markets and industries. As our operations are significantly U.S. based, we have not been, to date, materially impacted by this conflict. We continue to monitor the uncertainty surrounding the extent and duration of this ongoing conflict and the impact that it may have on the global economy and on our business.

Heightened levels of inflation present risk for us in terms of increased labor costs, transportation costs and energy costs that may not be able to be passed on to customers through increased pricing. In addition, rising interest rates will increase our borrowing costs on new and existing debt.

Sales increased by 10% or $26.3 million in our Oil & Gas Proppants segment during the three months ended March 31, 2023 compared to the three months ended December 31, 2022. This was due primarily to higher energy prices and a rebound in overall well completion activity. Our results for the three month period ended March 31, 2023 in this segment are not necessarily indicative of the results that may be expected for the full year ending December 31, 2023.

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Amounts in thousands, except per ton data	Three Months Ended				Percentage Change
Oil & Gas Proppants	March 31, 2023		December 31, 2022		March 31, 2023 vs. December 31, 2022
Sales	$	300,013	$	273,717	10	%
Tons Sold	3,921		3,568		10	%
Average Selling Price per Ton	$	76.51	$	76.71	—	%

If oil and gas drilling and completion activity is not sustained, or if frac sand supply remains greater than demand, then we may sell fewer tons, sell tons at lower prices, or both. If we sell less frac sand or sell frac sand at lower prices, our revenue, net income, cash generated from operating activities, and liquidity would be adversely affected, and we could incur material asset impairments. If these events occur, we may evaluate further actions to reduce cost and improve liquidity.

Industrial and specialty products end market trends

Demand in the industrial and specialty products end markets has been relatively stable in recent years and is primarily influenced by key macroeconomic drivers such as the housing market, population growth, light vehicle sales, beer and wine production, repair and remodel activity and industrial production. The primary end markets served by our Industrial & Specialty Products segment are building and construction products, fillers and extenders, filtration, glassmaking, absorbents, foundry, and sports and recreation. We have been increasing our value-added product offerings in the industrial and specialty products end markets organically as well as through acquisitions, such as White Armor and EPM. Additionally, we have increased our focus on the alternative energy markets and products necessary for the supply chains of solar panels, renewable diesel and wind turbines. Sales of these new higher margin products have increased our Industrial & Specialty Products segment's profitability.

Heightened levels of inflation present risk for us in terms of increased labor costs, transportation costs and energy costs that may not be able to be passed on to customers through increased pricing. In addition, rising interest rates will increase our borrowing costs on new and existing debt. Additionally, we continue to monitor the uncertainty surrounding the extent and duration of the Russia and Ukraine conflict on our business as discussed above.

Our Business Strategy

The key drivers of our growth strategy include:

•increasing our presence and new product development in specialty products end markets;

•optimizing our product mix and further developing value-added capabilities to maximize margins;

•effectively positioning our Oil & Gas Proppants facilities to optimally serve our customers;

•optimizing our supply chain network and leveraging our logistics capabilities to meet our customers’ needs;

•evaluating both Greenfield and Brownfield expansion opportunities and other acquisitions; and

•maintaining financial strength and flexibility.

How We Generate Our Sales

    Products

    We derive our product sales by mining and processing minerals that our customers purchase for various uses. Our product sales are primarily a function of the price per ton and the number of tons sold. We primarily sell our products through individual purchase orders executed under short-term price agreements or at prevailing market rates. The amount invoiced reflects the price of the product, transportation, surcharges, and additional handling services as applicable, such as storage, transloading the product from railcars to trucks and last mile logistics to the customer site. We invoice most of our product customers on a per shipment basis, although for some larger customers we consolidate invoices weekly or monthly. Standard collection terms are net 30 days, although extended terms are offered in competitive situations.    

Services

    We derive our service sales primarily through the provision of transportation, equipment rental, and contract labor services to companies in the oil and gas industry. Transportation services typically consist of transporting customer proppant from storage facilities to proximal well-sites and are contracted through work orders executed under established pricing agreements. The amount invoiced reflects transportation services rendered. Equipment rental services provide customers with

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use of either dedicated or nonspecific wellhead proppant delivery equipment solutions for contractual periods defined either through formal lease agreements or executed work orders under established pricing agreements. The amounts invoiced reflect the length of time the equipment set was utilized in the billing period. Contract labor services provide customers with proppant delivery equipment operators through work orders executed under established pricing agreements. The amounts invoiced reflect the amount of time our customer utilized our labor services in the billing period. We typically invoice our customers weekly or bi-weekly; however, some customers receive invoices monthly or upon well-site operation completion, depending on terms established in contracts or work orders. Standard collection terms are net 30 days, although extended terms are offered in competitive situations.

    Our ten largest customers accounted for 45% and 40% of total sales for the three months ended March 31, 2023 and 2022, respectively. No customers accounted for 10% or more of our total sales for the three months ended March 31, 2023 or 2022. At March 31, 2023 and December 31, 2022, none of our customers' accounts receivable represented 10% or more of our total trade accounts receivable.

    For a limited number of customers, we sell under long-term, minimum purchase supply agreements. These agreements define, among other commitments, the volume of product that our customers must purchase, the volume of product that we must provide and the price that we will charge and that our customers will pay for each product. Prices under these agreements are generally fixed and subject to certain contractual adjustments. Sometimes these agreements may undergo negotiations regarding pricing and volume requirements, particularly in volatile market conditions. When these negotiations occur, we may deliver sand at prices or at volumes below the requirements in our existing supply agreements. An executed order specifying the type and quantity of product to be delivered, in combination with the noted agreements, comprise our contracts in these arrangements. Selling more tons under supply contracts enables us to be more efficient from a production, supply chain and logistics standpoint. As discussed in Part I, Item 1A., Risk Factors of our 2022 Annual Report, these customers may not continue to purchase the same levels of product in the future due to a variety of reasons, contract requirements notwithstanding.

    As of March 31, 2023, we had 12 minimum purchase supply agreements in the Oil & Gas Proppants segment with initial terms expiring between 2023 and 2034. As of March 31, 2022, we had seven minimum purchase supply agreements in the Oil & Gas Proppants segment with initial terms expiring between 2022 and 2034. Collectively, sales to customers with minimum purchase supply agreements accounted for 54% and 31% of Oil & Gas Proppants segment sales during the three months ended March 31, 2023 and 2022, respectively.

    In the industrial and specialty products end markets we have not historically entered into long-term minimum purchase supply agreements with our customers because of the high cost to our customers of switching providers. We may periodically do so when capital or other investment is required to meet customer needs. Instead, we often enter into supply agreements with our customers with targeted volumes and terms of one to five years. Prices under these agreements are generally fixed and subject to annual increases.

The Costs of Conducting Our Business

    The principal expenses involved in conducting our business are transportation costs, labor costs, electricity and drying fuel costs, and maintenance and repair costs for our mining and processing equipment and facilities. Transportation and related costs include freight charges, fuel surcharges, transloading fees, switching fees, railcar lease costs, demurrage costs, storage fees and labor costs. Our operating costs can vary significantly based on the volume of product produced and current economic conditions. We benefit from owning the majority of the mineral deposits that we mine and having long-term mineral rights leases or supply agreements for our other primary sources of raw material, which limits royalty payments.

    Additionally, we incur expenses related to our corporate operations, including costs for sales and marketing; research and development; and the finance, legal, human resources, information technology, and environmental, health and safety functions of our organization. These costs are principally driven by personnel expenses.

How We Evaluate Our Business

    Our management team evaluates our business using a variety of financial and operating metrics. We evaluate the performance of our two segments based on their tons sold, average selling price and contribution margin earned. Additionally, we consider a number of factors in evaluating the performance of our business as a whole, including total tons sold, average selling price, total segment contribution margin, and Adjusted EBITDA. We view these metrics as important factors in evaluating our profitability and review these measurements frequently to analyze trends and make decisions, and we believe the

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presentation of these metrics provides useful information to our investors regarding our financial condition and results of operations for the same reasons.

Segment Contribution Margin

    Segment contribution margin, a non-GAAP measure, is a key metric that management uses to evaluate our operating performance and to determine resource allocation between segments. Segment contribution margin excludes selling, general, and administrative costs, corporate costs, plant capacity expansion expenses, and facility closure costs.

    Segment contribution margin is not a measure of our financial performance under GAAP and should not be considered as an alternative or superior to measures derived in accordance with GAAP. Our measure of segment contribution margin is not necessarily comparable to other similarly titled captions of other companies due to potential inconsistencies in the methods of calculation. For more information about segment contribution margin, including a reconciliation of this measure to its most directly comparable GAAP financial measure, net income (loss), see Note T - Segment Reporting to our Condensed Consolidated Financial Statements in Part I, Item 1. of this Quarterly Report on Form 10-Q.

Adjusted EBITDA

    Adjusted EBITDA, a non-GAAP measure, is included in this report because it is a key metric used by management to assess our operating performance and by our lenders to evaluate our covenant compliance. Adjusted EBITDA excludes certain income and/or costs, the removal of which improves comparability of operating results across reporting periods. Our target performance goals under our incentive compensation plan are tied, in part, to our Adjusted EBITDA.

    Adjusted EBITDA is not a measure of our financial performance or liquidity under GAAP and should not be considered as an alternative or superior to net income (loss) as a measure of operating performance, cash flows from operating activities as a measure of liquidity or any other performance measure derived in accordance with GAAP. Additionally, Adjusted EBITDA is not intended to be a measure of free cash flow for management’s discretionary use, as it does not consider certain cash requirements such as interest payments, tax payments and debt service requirements. Adjusted EBITDA contains certain other limitations, including the failure to reflect our cash expenditures, cash requirements for working capital needs and cash costs to replace assets being depreciated and amortized, and excludes certain charges that may recur in the future. Management compensates for these limitations by relying primarily on our GAAP results and by using Adjusted EBITDA only supplementally. Our measure of Adjusted EBITDA is not necessarily comparable to other similarly titled captions of other companies due to potential inconsistencies in the methods of calculation.

    The following table sets forth a reconciliation of net income (loss), the most directly comparable GAAP financial measure, to Adjusted EBITDA:

(amounts in thousands)	Three Months Ended   March 31,
	2023		2022
Net income (loss) attributable to U.S. Silica Holdings, Inc.	$	44,648	$	(8,393)
Total interest expense, net of interest income	21,568		17,153
Provision for taxes	13,573		(6,969)
Total depreciation, depletion and amortization expenses	35,386		37,749
EBITDA	115,175		39,540
Non-cash incentive compensation (1)	3,335		4,657
Post-employment expenses (excluding service costs) (2)	(839)		(701)
Merger and acquisition related expenses (3)	224		1,868
Plant capacity expansion expenses (4)	66		46
Contract termination expenses (5)	—		6,500
Business optimization projects (6)	956		11
Facility closure costs (7)	81		490
Other adjustments allowable under the Credit Agreement (8)	5,637		492
Adjusted EBITDA	$	124,635	$	52,903

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(1)	Reflects equity-based and other equity-related compensation expense.
(2)	Includes net pension cost and net post-retirement cost relating to pension and other post-retirement benefit obligations during the applicable period, but in each case excluding the service cost relating to benefits earned during such period. Non-service net periodic benefit costs are not considered reflective of our operating performance because these costs do not exclusively originate from employee services during the applicable period and may experience periodic fluctuations as a result of changes in non-operating factors, including changes in discount rates, changes in expected returns on benefit plan assets, and other demographic actuarial assumptions. See Note O - Pension and Post-Retirement Benefits to our Consolidated Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q for more information.
(3)	Merger and acquisition related expenses include legal fees, professional fees, bank fees, severance costs, and other employee related costs. While these costs are not operational in nature and are not expected to continue for any singular transaction on an ongoing basis, similar types of costs, expenses and charges have occurred in prior periods and may recur in the future as we continue to integrate prior acquisitions and pursue any future acquisitions.
(4)	Plant capacity expansion expenses include expenses that are not inventoriable or capitalizable as related to plant expansion projects greater than $5 million in capital expenditures or plant start up projects. While these expenses are not operational in nature and are not expected to continue for any singular project on an ongoing basis, similar types of expenses have occurred in prior periods and may recur in the future if we continue to pursue future plant capacity expansions.
(5)	Reflects contract termination expenses related to strategically exiting a supplier service contract. While these expenses are not operational in nature and are not expected to continue for any singular event on an ongoing basis, similar types of expenses have occurred in prior periods and may recur in the future as we continue to strategically evaluate our contracts.
(6)	Reflects costs incurred related to business optimization projects within our corporate center, which aim to measure and improve the efficiency, productivity and performance of our organization. While these costs are not operational in nature and are not expected to continue for any singular project on an ongoing basis, similar types of expenses may recur in the future.
(7)	Reflects costs incurred related to idled sand facilities and closed corporate offices, including severance costs and remaining contracted costs such as office lease costs, maintenance, and utilities. While these costs are not operational in nature and are not expected to continue for any singular event on an ongoing basis, similar types of expenses may recur in the future.
(8)	Reflects miscellaneous adjustments permitted under the Credit Agreement, such as recruiting fees and relocation costs. The three months ended March 31, 2023 also included costs related to severance restructuring of $0.8 million, an adjustment to non-controlling interest of $0.2 million and $5.3 million related to the loss on extinguishment of debt, offset by an insurance recovery of $0.8 million. The three months ended March 31, 2022 also included costs related to weather events and supplier and logistical issues of $0.8 million, severance restructuring of $0.1 million, an adjustment to non-controlling interest of $0.1 million, partially offset by proceeds of the sale of assets of $0.5 million.

    Adjusted EBITDA-Trailing Twelve Months

    Our revolving credit facility (the "Revolver") contains a consolidated total net leverage ratio of no more than 4.00:1.00 that, unless we have the consent of our lenders, we must meet as of the last day of any fiscal quarter whenever usage of the Revolver (other than certain undrawn letters of credit) exceeds 2.85:1.00, or 35%, of the Revolver commitment. This ratio is calculated based on our Adjusted EBITDA for the trailing twelve months. Noncompliance with this financial ratio covenant could result in the acceleration of our obligations to repay all amounts outstanding under the Revolver and the term loan (the "Term Loan") (collectively the "Credit Facility"). Moreover, the Revolver and the Term Loan contain covenants that restrict, subject to certain exceptions, our ability to make permitted acquisitions, incur additional indebtedness, make restricted payments (including dividends) and retain excess cash flow based, in some cases, on our ability to meet leverage ratios calculated based on our Adjusted EBITDA for the trailing twelve months.

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    See the description under “Adjusted EBITDA” above for certain important information about Adjusted EBITDA-trailing twelve months, including certain limitations and management’s use of this metric in light of its status as a non-GAAP measure.

    As of March 31, 2023, we were in compliance with all covenants under our Credit Facility, and our Revolver usage was zero (not including $21.3 million allocated for letters of credit). Since the Revolver usage did not exceed 2.85:1.00, or 35%, of the Revolver commitment, the consolidated leverage ratio covenant did not apply. Based on our consolidated leverage ratio of 2.14:1.00 as of March 31, 2023, we may draw up to approximately $52.6 million without the consent of our lenders. With the consent of our lenders, we have access to the full availability of the Revolver. The calculation of the consolidated leverage ratio incorporates the Adjusted EBITDA-trailing twelve months as follows:

(All amounts in thousands, except calculated ratio)	March 31, 2023
Total debt	$	907,575
Finance leases	3,028
Total consolidated debt	$	910,603
Adjusted EBITDA-trailing twelve months	$	425,290
Pro forma Adjusted EBITDA including impact of acquisitions (1)	—
Other adjustments for covenant calculation (2)	253
Total Adjusted EBITDA-trailing twelve months for covenant calculation	$	425,543
Consolidated leverage ratio(3)	2.14

(1)	Covenant calculation allows for the Adjusted EBITDA-trailing twelve months to include the impact of acquisitions on a pro forma basis.
(2)	Covenant calculation excludes activity at legal entities above the operating company, which is mainly interest income offset by public company operating expenses.
(3)	Calculated by dividing total consolidated debt by total Adjusted EBITDA-trailing twelve months for covenant calculation.

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Results of Operations for the Three Months Ended March 31, 2023 and 2022

Sales

(In thousands except per ton data)	Three Months Ended   March 31,				Percent Change
	2023		2022		2023 vs. 2022
Sales:
Oil & Gas Proppants	$	300,013	$	176,244	70	%
Industrial & Specialty Products	142,227		128,643		11	%
Total sales	$	442,240	$	304,887	45	%
Tons:
Oil & Gas Proppants	3,921		3,060		28	%
Industrial & Specialty Products	1,013		1,074		(6)	%
Total Tons	4,934		4,134		19	%
Average Selling Price per Ton:
Oil & Gas Proppants	$	76.51	$	57.60	33	%
Industrial & Specialty Products	$	140.40	$	119.78	17	%
Overall Average Selling Price per Ton	$	89.63	$	73.75	22	%

Total sales increased 45% for the three months ended March 31, 2023 compared to the three months ended March 31, 2022, driven by a 19% increase in total tons sold and a 22% increase in overall average selling price.

The increase in total sales was mainly driven by Oil & Gas Proppants sales, which increased 70% for the three months ended March 31, 2023 compared to the three months ended March 31, 2022. Oil & Gas Proppants average selling price increased 33% and tons sold increased 28%. This increase is due to higher energy prices and a rebound in overall well completion activity.

The increase in total sales was also partially driven by Industrial & Specialty Products sales, which increased 11% for the three months ended March 31, 2023 compared to the three months ended March 31, 2022. Industrial & Specialty Products tons sold decreased 6% and average selling price increased by 17%. The overall increase is due to improved market conditions and pricing increases implemented throughout the prior year.

Cost of Sales (excluding depreciation, depletion, and amortization)

Cost of sales increased by $66.2 million, or 29%, to $293.1 million for the three months ended March 31, 2023 compared to $226.9 million for the three months ended March 31, 2022. These changes resulted from the main components of cost of sales as discussed below. As a percentage of sales, cost of sales represented 66% for the three months ended March 31, 2023 compared to 74% for the same period in 2022.

We incurred $144.6 million and $100.3 million of transportation and related costs for the three months ended March 31, 2023 and 2022, respectively. The $44.3 million increase was mainly due to increased volumes, increased carrier costs for SandBox and increased rail car and barge rates. As a percentage of sales, transportation and related costs represented 33% for both the three months ended March 31, 2023 and 2022.

We incurred $46.4 million and $39.9 million of operating labor costs for the three months ended March 31, 2023 and 2022, respectively. The $6.5 million increase in labor cost was mainly due to increased headcount to support increased production and merit increases. As a percentage of sales, operating labor costs represented 10% and 13% for the three months ended March 31, 2023 and 2022, respectively.

We incurred $18.9 million and $18.6 million of electricity and drying fuel (principally natural gas) costs for the three months ended March 31, 2023 and 2022, respectively. The $0.3 million increase in electricity and drying fuel costs was mainly

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due to increased volumes produced and increased natural gas prices. As a percentage of sales, electricity and drying fuel costs represented 4% and 6% for the three months ended March 31, 2023 and 2022, respectively.

We incurred $25.2 million and $19.6 million of maintenance and repair costs for the three months ended March 31, 2023 and 2022, respectively. The $5.6 million increase in maintenance and repair costs is mainly due to an increase in maintenance projects as production increased. As a percentage of sales, maintenance and repair costs represented 6% for both the three months ended March 31, 2023 and 2022.

Segment Contribution Margin

Industrial & Specialty Products contribution margin increased by $5.1 million to $42.9 million for the three months ended March 31, 2023 compared to $37.8 million for the three months ended March 31, 2022, driven by a $13.6 million increase in revenue offset by an $8.5 million increase in cost of sales.

Oil & Gas Proppants contribution margin increased by $65.1 million to $109.9 million for the three months ended March 31, 2023 compared to $44.8 million for the three months ended March 31, 2022, driven by a $123.8 million increase in sales offset by a $58.6 million increase in cost of sales.

Selling, General and Administrative Expenses

Selling, general and administrative expenses decreased by $10.9 million, or 27%, to $29.2 million for the three months ended March 31, 2023 compared to $40.1 million for the three months ended March 31, 2022. The decrease was primarily due to costs associated with fees related to the termination of a supplier contract and expenses related to the strategic review of our Industrial & Specialty Products segment not recurring in 2023.

    In total, our selling, general and administrative expenses represented approximately 7% and 13% of our sales for the three months ended March 31, 2023 and 2022, respectively.

Depreciation, Depletion and Amortization

Depreciation, depletion and amortization expense decreased by $2.3 million, or 6%, to $35.4 million for the three months ended March 31, 2023 compared to $37.7 million for the three months ended March 31, 2022 primarily due to certain assets fully depreciating during 2022. Depreciation, depletion and amortization expense represented approximately 8% and 12% of our sales for the three months ended March 31, 2023 and 2022, respectively.

Goodwill and Other Asset Impairments

During the three months ended March 31, 2023 and 2022, no asset impairment charges were recorded.

Operating Income (Loss)

Operating income for the three months ended March 31, 2023 was $84.6 million compared to operating income of $0.2 million for the three months ended March 31, 2022. The change was mainly driven by a 45% increase in sales, a 6% decrease in depreciation, depletion and amortization expense and a 27% decrease in selling, general and administrative expenses, partially offset by a 29% increase in cost of sales.

Interest Expense

Interest expense increased by $6.9 million, or 40%, to $24.1 million for the three months ended March 31, 2023 compared to $17.2 million for the three months ended March 31, 2022 primarily due to higher interest rates.

Other Income (Expense), Net, Including Interest Income

Other income (expense), net, decreased by $3.9 million, to other expense of $2.4 million for the three months ended March 31, 2023 compared to other income of $1.5 million for the three months ended March 31, 2022, due primarily to the loss related to extinguishment of debt offset by an increase in interest income.

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Provision for Income Taxes    

For the three months ended March 31, 2023 and 2022, we had tax expense of $13.6 million and a tax benefit of $7.0 million, respectively. The effective tax rates were 23% and 45% for the three months ended March 31, 2023 and 2022, respectively. Without discrete items, which primarily consist of tax expense related to equity compensation and non-US income taxes, the effective tax rates for the three months ended March 31, 2023 and 2022 would have been 26% and 48%, respectively.

During the three months ended March 31, 2023 and 2022, we recorded a tax benefit of $2.3 million and tax expense of $0.3 million, respectively, related to equity compensation.

Historically, our actual effective tax rates have differed from the statutory effective rate primarily due to the benefit received from statutory percentage depletion allowances. The deduction for statutory percentage depletion does not necessarily change proportionately to changes in income before income taxes. For the quarter ended March 31, 2023, the benefit received from statutory percentage depletion allowances was offset by nondeductible executive compensation and state income taxes.

Net Income (Loss)

Net income (loss) attributable to U.S. Silica Holdings, Inc., was net income of $44.6 million and a net loss of $8.4 million for the three months ended March 31, 2023 and 2022, respectively. The year over year changes were due to the factors noted above.

Liquidity and Capital Resources

Overview

    Our principal liquidity requirements have historically been to service our debt, to meet our working capital, capital expenditure and mine development expenditure needs, to return cash to our stockholders, and to pay for acquisitions. We have historically met our liquidity and capital investment needs with funds generated through operations. We have historically funded our acquisitions through cash on hand, borrowings under our credit facilities, or equity issuances. Our working capital is the amount by which current assets exceed current liabilities and is a measure of our ability to pay our liabilities as they become due. As of March 31, 2023, our working capital was $308.2 million and we had $128.7 million of availability under the Revolver. Based on our consolidated leverage ratio of 2.14:1.00 as of March 31, 2023, we may draw up to approximately $52.6 million without the consent of our lenders. With the consent of our lenders, we have access to the full availability of the Revolver.

    On March 23, 2023, we entered into a Fourth Amended and Restated Credit Agreement (the "Credit Agreement"), by entering into a new $1.1 billion senior secured credit facility, consisting of a $950 million Term Loan and a $150 million revolving credit facility that may also be used for swingline loans or letters of credit, and we may elect to increase the term loan or the revolving credit facility in accordance with the terms of the Credit Agreement. Borrowings under the Credit Agreement will bear interest at variable rates as determined at our election, based on the Term Secured Overnight Financing Rate ("SOFR") or a base rate, in each case, plus an applicable margin.

    Management and our Board of Directors remain committed to evaluating additional ways of creating shareholder value. Any determination to pay dividends or other distributions in cash, stock, or property in the future or otherwise return capital to our stockholders, including decisions about existing or new share repurchase programs, will be at the discretion of our Board of Directors and will be dependent on then-existing conditions, including industry and market conditions, our financial condition, results of operations, liquidity and capital requirements, contractual restrictions including restrictive covenants contained in debt agreements, and other factors. Additionally, because we are a holding company, our ability to pay dividends on our common stock may be limited by restrictions on the ability of our subsidiaries to pay dividends or make distributions to us, including restrictions under the terms of the agreements governing our indebtedness. During the second quarter of 2020, our Board of Directors determined that it was not in the best interest of our shareholders to issue a dividend and we have not issued dividends subsequently. We do not have plans to resume issuing dividends.

Net Debt (non-GAAP measure)

Net debt is a non-GAAP measure and is included in this report because we believe it is meaningful to investors as we consider net debt and its components to be important indicators of liquidity and financial position. Net debt may not be computed the same as similarly titled measures used by other companies. We define net debt as total debt less cash and cash equivalents. Net debt should not be considered as an alternative or superior to other performance measures derived in accordance with GAAP.

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The following table provides net debt (in thousands):

	March 31, 2023		December 31, 2022
Total Debt	$	910,603	$	1,056,993
Less:
Cash and cash equivalents	139,494		280,845
Net Debt	$	771,109	$	776,148

Total Debt:

Total debt was $910.6 million and $1.06 billion as of March 31, 2023 and December 31, 2022, respectively. The decrease was primarily due to the repurchase of $109 million of debt and the capitalization of $45.2 million of costs associated with the execution of the Fourth Amendment to the Credit Agreement.

Cash and Cash Equivalents:

Cash and cash equivalents were $139.5 million and $280.8 million as of March 31, 2023 and December 31, 2022, respectively. The decrease was primarily due to the repurchase of $109 million of debt and $40.9 million of financing fees paid associated with the execution of the Fourth Amendment to the Credit Agreement.

Cash Flow Analysis

    A summary of operating, investing and financing activities (in thousands) is shown in the following table:

	Three Months Ended   March 31,
	2023		2022
Net cash provided by (used in):
Operating activities	$	40,902	$	15,079
Investing activities	(18,931)		(6,383)
Financing activities	(163,322)		(8,353)

Net Cash Provided by / Used in Operating Activities

Operating activities consist primarily of net income (loss) adjusted for certain non-cash and working capital items. Adjustments to net income or loss for non-cash items include depreciation, depletion and amortization, deferred revenue, deferred income taxes, equity-based compensation and allowance for credit losses. In addition, operating cash flows include the effect of changes in operating assets and liabilities, principally accounts receivable, inventories, prepaid expenses and other current assets, income taxes payable and receivable, accounts payable and accrued expenses.

Net cash provided by operating activities was $40.9 million for the three months ended March 31, 2023. This was mainly due to $44.6 million of net income adjusted for non-cash items, including $35.4 million in depreciation, depletion and amortization, $8.9 million in deferred income taxes, $3.3 million in equity-based compensation, $5.6 million in deferred revenue, and $9.5 million in other miscellaneous non-cash items. Also contributing to the change was a $17.6 million increase in accounts receivable, a $4.8 million increase in inventories, a $3.7 million decrease in prepaid expenses and other current assets, a $32.7 million decrease in accounts payable and accrued liabilities, $6.5 million payments on lease liabilities, and a $2.8 million change in other operating assets and liabilities.

Net cash provided by operating activities was $15.1 million for the three months ended March 31, 2022. This was mainly due to an $8.5 million net loss adjusted for non-cash items, including $37.7 million in depreciation, depletion and amortization, $15.3 million in deferred income taxes, $4.4 million in equity-based compensation, $0.9 million in deferred revenue, and $9.7 million in other miscellaneous non-cash items. Also contributing to the change was a $4.1 million decrease in

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accounts receivable, a $7.9 million increase in inventories, a $3.5 million decrease in prepaid expenses and other current assets, a $5.2 million decrease in accounts payable and accrued liabilities, $7.5 million payments on lease liabilities, and a $0.9 million change in other operating assets and liabilities.

Net Cash Used in / Provided by Investing Activities

Investing activities consist primarily of cash consideration paid to acquire businesses and capital expenditures for growth and maintenance.

Net cash used in investing activities was $18.9 million for the three months ended March 31, 2023. This was due to capital expenditures of $18.9 million offset by $0.1 million in proceeds from the sale of property, plant and equipment. Capital expenditures for the three months ended March 31, 2023 were primarily related to growth projects, facility improvement and maintenance projects, and other environmental and health and safety projects.

Net cash used in investing activities was $6.4 million for the three months ended March 31, 2022. This was mainly due to capital expenditures of $7.0 million offset by $0.7 million in proceeds from the sale of property, plant and equipment.

Subject to our continuing evaluation of market conditions, we anticipate that our capital expenditures in 2023 will be approximately $50 million to $60 million, which will primarily be associated with maintenance, cost improvement capital projects, and various growth projects. We expect to fund our capital expenditures through cash on our balance sheet, cash generated from our operations, and cash generated from financing activities.

Net Cash Used in / Provided by Financing Activities

Financing activities consist primarily of equity issuances, dividend payments, share repurchases, borrowings and repayments related to the Revolver and Term Loan, as well as fees and expenses paid in connection with our credit facilities.

Net cash used in financing activities was $163.3 million for the three months ended March 31, 2023. This was mainly due to $2.8 million of short-term debt payments, $109.1 million of long-term debt payments, $40.9 million in financing fees paid, $0.4 million of distributions to a non-controlling interest, $0.2 million of principal payments on finance leases, and $9.9 million of tax payments related to shares withheld for vested restricted stock and stock units.

Net cash used in financing activities was $8.4 million for the three months ended March 31, 2022. This was mainly due to $2.2 million of short-term debt payments, $3.3 million of long-term debt payments, $0.3 million of distributions to a non-controlling interest, $0.3 million of principal payments on finance leases, and $2.1 million of tax payments related to shares withheld for vested restricted stock and restricted stock units.

Off-Balance Sheet Arrangements

We have no off-balance sheet arrangements that have a current material effect or are reasonably likely to have a future material effect on our financial condition, changes in financial condition, sales, expenses, results of operations, liquidity, capital expenditures or capital resources.

Contractual Obligations

There have been no significant changes outside of the ordinary course of business to our “Contractual Obligations” table in Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” of our 2022 Annual Report. For more details on future minimum annual purchase commitments and operating leases commitments, please see accompanying Note N - Commitments and Contingencies and Note P - Leases to our Consolidated Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q.

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Environmental Matters

We are subject to various federal, state and local laws and regulations governing, among other things, hazardous materials, air and water emissions, environmental contamination and reclamation and the protection of the environment and natural resources. We have made, and expect to make in the future, expenditures to comply with such laws and regulations, but cannot predict the full amount of such future expenditures. As of March 31, 2023, we had $21.2 million accrued for future reclamation costs, as compared to $20.7 million as of December 31, 2022.

We discuss certain environmental matters relating to our various production and other facilities, certain regulatory requirements relating to human exposure to crystalline silica and our mining activity and how such matters may affect our business in the future under Item 1, "Business", Item 1A, “Risk Factors”, Item 3, “Legal Proceedings” and Item 7, "Management's Discussion and Analysis of Financial Condition and Results of Operations-Environmental Matters" in our 2022 Annual Report.

Critical Accounting Policies and Estimates

Our discussion and analysis of our financial condition and results of operations are based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America. The preparation of these financial statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the dates of the financial statements and the reported revenues and expenses during the reporting periods. We evaluate these estimates and assumptions on an ongoing basis and base our estimates on historical experience, current conditions and various other assumptions that are believed to be reasonable under the circumstances. The results of these estimates form the basis for making judgments about the carrying values of assets and liabilities as well as identifying and assessing the accounting treatment with respect to commitments and contingencies. Our actual results may materially differ from these estimates.

A summary of our significant accounting policies, including certain critical accounting policies and estimates, are included in Note B - Summary of Significant Accounting Policies to the Consolidated Financial Statements in Item 8 of our 2022 Annual Report on Form 10-K. Management believes that the application of these policies on a consistent basis enables us to provide the users of the Consolidated Financial Statements with useful and reliable information about our operating results and financial condition.

Recent Accounting Pronouncements

New accounting pronouncements that have been recently adopted are described in Note B - Summary of Significant Accounting Policies to our Consolidated Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q.

Availability of Reports; Website Access; Other Information

Our Internet address is http://www.ussilica.com. Through “Investors” — “Financial Information” on our home page, we make available free of charge our annual reports on Form 10-K, our quarterly reports on Form 10-Q, our proxy statements, our current reports on Form 8-K, SEC Forms 3, 4 and 5 and any amendments to those reports filed or furnished pursuant to Sections 13(a) or 15(d) of the Exchange Act as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. Our reports filed with the SEC are also available on its website at http://www.sec.gov.

Stockholders may also request a free copy of these documents from: U.S. Silica Holdings, Inc., attn.: Investor Relations, 24275 Katy Freeway, Suite 600, Katy, Texas 77494.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market Risk

We are exposed to certain market risks, which exist as a part of our ongoing business operations. Such risks arise from adverse changes in market rates, prices and conditions. We address such market risks in “Recent Trends and Outlook” and "How We Generate Our Sales" in Item 2. of this Quarterly Report on Form 10-Q.

Interest Rate Risk

We are exposed to interest rate risk arising from adverse changes in interest rates. As of March 31, 2023, we had $950.0 million of debt outstanding under the Credit Agreement. Assuming SOFR is greater than the 1.0% minimum base rate

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on the Term Loan, a hypothetical increase in interest rates by 1.0% would have changed our interest expense by $9.5 million per year.

Upon execution of the Fourth Amendment to our Credit Agreement, we have transitioned from LIBOR to SOFR. See Note I - Debt for discussion of the Fourth Amendment of the Credit Agreement.

We use natural gas swaps in order to manage our exposure to the volatility of natural gas prices. We do not use derivatives for trading or speculative purposes. As of March 31, 2023, the fair value of our natural gas swaps was a liability of $4.3 million. As of December 31, 2022, the fair value of our natural gas swaps was a liability of $3.1 million. For more information see Note L - Derivative Instruments to our Consolidated Financial Statements in Part I, Item 1. of this Quarterly Report on Form 10-Q.

Credit Risk

We are subject to risks of loss resulting from nonpayment or nonperformance by our customers. We examine the creditworthiness of third-party customers to whom we extend credit and manage our exposure to credit risk through credit analysis, credit approval, credit limits and monitoring procedures, and for certain transactions, we may request letters of credit, prepayments or guarantees, although collateral is generally not required.

Despite enhancing our examination of our customers' creditworthiness, we may still experience delays or failures in customer payments. Some of our customers have reported experiencing financial difficulties. With respect to customers that may file for bankruptcy protection, we may not be able to collect sums owed to us by these customers and we also may be required to refund pre-petition amounts paid to us during the preference period (typically 90 days) prior to the bankruptcy filing.

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ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our chief executive officer and chief financial officer, evaluated the effectiveness of our disclosure controls and procedures as of March 31, 2023. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Based on the evaluation of our disclosure controls and procedures as of March 31, 2023, our chief executive officer and chief financial officer concluded that, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level.

Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable, and not absolute, assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

Changes in Internal Control over Financial Reporting

There were no changes in our existing internal control over financial reporting identified in management’s evaluation pursuant to Rules 13a-15(d) or 15d-15(d) of the Exchange Act during the quarter ended March 31, 2023 that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II—OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

In addition to the matters described below, we are subject to various legal proceedings, claims, and governmental inspections, audits or investigations incidental to our business, which can cover general commercial, governmental regulations, antitrust and trade regulations, product liability, environmental, intellectual property, employment and other matters. Although the outcomes of these ordinary routine claims cannot be predicted with certainty, in the opinion of management, the ultimate resolution of these matters will not have a material adverse effect on our financial position or results of operations.

Prolonged inhalation of excessive levels of respirable crystalline silica dust can result in silicosis, a disease of the lungs. Breathing large amounts of respirable silica dust over time may injure a person’s lungs by causing scar tissue to form. Crystalline silica in the form of quartz is a basic component of soil, sand, granite and most other types of rock. Cutting, breaking, crushing, drilling, grinding and abrasive blasting of or with crystalline silica containing materials can produce fine silica dust, the inhalation of which may cause silicosis, lung cancer and possibly other diseases including immune system disorders such as scleroderma. Sources of exposure to respirable crystalline silica dust include sandblasting, foundry manufacturing, crushing and drilling of rock, masonry and concrete work, mining and tunneling, and cement and asphalt pavement manufacturing.

Since at least 1975, we and/or our predecessors have been named as a defendant, usually among many defendants, in numerous lawsuits brought by or on behalf of current or former employees of our customers alleging damages caused by silica exposure. Prior to 2001, the number of silicosis lawsuits filed annually against the commercial silica industry remained relatively stable and was generally below 100, but between 2001 and 2004 the number of silicosis lawsuits filed against the commercial silica industry substantially increased. This increase led to greater scrutiny of the nature of the claims filed, and in June 2005, the U.S. District Court for the Southern District of Texas issued an opinion in the former federal silica multi-district litigation remanding almost all of the 10,000 cases then pending in the multi-district litigation back to the state courts from which they originated for further review and medical qualification, leading to a number of silicosis case dismissals across the United States. In conjunction with this and other favorable court rulings establishing “sophisticated user” and “no duty to warn” defenses for silica producers, several states, including Texas, Ohio and Florida, have passed medical criteria legislation that requires proof of actual impairment before a lawsuit can be filed.

As a result of the above developments, the filing rate of new claims against us over the past few years has decreased to below pre-2001 levels, and we were named as a defendant in zero, two, and one new silicosis cases filed in 2022, 2021, and 2020, respectively. During the three months ended March 31, 2023, no new claims were brought against U.S. Silica. As of March 31, 2023, there were 42 active silica-related product liability claims pending in which U.S. Silica is a defendant. Almost all of the claims pending against us arise out of the alleged use of our silica products in foundries or as an abrasive blast media and involve various other defendants. Prior to the fourth quarter of 2012, we had insurance policies for both our predecessors that cover certain claims for alleged silica exposure for periods prior to certain dates in 1985 and 1986 (with respect to certain insurance). As a result of a settlement with a former owner and its insurers in the fourth quarter of 2012, some of these policies are no longer available to us and we will not seek reimbursement for any defense costs or claim payments from these policies. Other insurance policies, however, continue to remain available to us and will continue to make such payments on our behalf.

The silica-related litigation brought against us to date has not resulted in a material liability to us. However, we may continue to have silica-related product liability claims filed against us, including claims that allege silica exposure for periods for which we do not have insurance coverage. Although the outcomes of these claims cannot be predicted with certainty, in the opinion of management, it is not reasonably possible that the ultimate resolution of these matters will have a material adverse effect on our financial position or results of operations that exceeds the accrual amounts.

For more information regarding silica-related litigation, see Part I, Item 1A. Risk Factors of our 2022 Annual Report on Form 10-K.

ITEM 1A. RISK FACTORS

There have been no material changes from the risk factors disclosed in Item 1A. Risk Factors in our 2022 Annual Report on Form 10-K.

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

Share Repurchase Program

The following table presents the total number of shares of our common stock that we repurchased during the first quarter of 2023, the average price paid per share, the number of shares that we repurchased as part of our share repurchase program, and the approximate dollar value of shares that still could have been repurchased at the end of the applicable fiscal period pursuant to our share repurchase program:

Period	Total Number of Shares Withheld(2)	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced  Program(1)	Maximum Dollar Value of Shares that May Yet Be Purchased Under the Program(1)
January 1, 2023 - January 31, 2023	22,311	$	11.68	—	126,540,060
February 1, 2023 - February 28, 2023	814,941	$	11.85	—	126,540,060
March 1, 2023 - March 31, 2023	—	$	—	—	126,540,060
Total	837,252	$	11.85	—

(1)

In May 2018, our Board of Directors authorized and announced the repurchase of up to $200 million of our common stock from time to time on the open market or in privately negotiated transactions. Stock repurchases, if any, will be funded using our available liquidity. The timing and amount of stock repurchases will depend on a variety of factors, including the market conditions as well as corporate and regulatory considerations. As of March 31, 2023, we have repurchased a total of 5,036,139 shares of our common stock at an average price of $14.59.

(2)

Shares withheld by U.S. Silica to pay taxes due upon the vesting of employee restricted stock and restricted stock units for the months ended January 31, February 28, and March 31, 2023, respectively.

We did not repurchase any shares of common stock under our share repurchase program during the three months ended March 31, 2023.

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ITEM 3. DEFAULT UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Safety is one of our core values and we strive to achieve a workplace free of injuries and occupational illnesses. Information concerning mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K (17 CFR 229.104) is included in Exhibit 95.1 to this Quarterly Report filed on Form 10-Q.

ITEM 5. OTHER INFORMATION

None.

ITEM 6. EXHIBITS

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		Incorporated by Reference
Exhibit Number	Description	Form	File No.	Exhibit	Filing Date
3.1	Third Amended and Restated Certificate of Incorporation of U.S. Silica Holdings, Inc., effective May 4, 2017.	8-K	001-35416	3.1	May 10, 2017
3.2	Third Amended and Restated Bylaws of U.S. Silica Holdings, Inc., effective May 4, 2017.	8-K	001-35416	3.2	May 10, 2017
10.1	Fourth Amended and Restated Credit Agreement, dated as of March 23, 2023, by and among USS Holdings, Inc., as guarantor, U.S. Silica Company, as borrower, certain of U.S. Silica Company’s subsidiaries as additional guarantors, the lenders named therein and BNP Paribas, as administrative agent for the lenders	8-K	001-35416	10.1	March 23, 2023
10.2 + *	Form of Restricted Stock Unit Agreement Pursuant to the Amended and Restated U.S. Silica Holdings, Inc. 2011 Incentive Compensation Plan
10.3 + *	Form of Performance Share Unit Agreement (Relative TSR) Pursuant to the Amended and Restated U.S. Silica Holdings, Inc. 2011 Incentive Compensation Plan
10.4 + *	Form of Performance Share Unit Agreement (Adjusted Cash Flow) Pursuant to the Amended and Restated U.S. Silica Holdings, Inc. 2011 Incentive Compensation Plan
31.1*	Rule 13a-14(a)/15(d)-14(a) Certification by Bryan A. Shinn, Chief Executive Officer.
31.2*	Rule 13a-14(a)/15(d)-14(a) Certification by Donald A. Merril, Chief Financial Officer.
32.1#	Section 1350 Certification by Bryan A. Shinn, Chief Executive Officer.
32.2#	Section 1350 Certification by Donald A. Merril, Chief Financial Officer.
95.1*	Mine Safety Disclosure.
101*	101.INS XBRL Instance - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
	101.SCH Inline XBRL Taxonomy Extension Schema
	101.CAL Inline XBRL Taxonomy Extension Calculation
	101.LAB Inline XBRL Taxonomy Extension Labels
	101.PRE Inline XBRL Taxonomy Extension Presentation
	101.DEF Inline XBRL Taxonomy Extension Definition
104*	Cover Page Interactive Data File (embedded within the Inline XBRL document)

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+	Management contract or compensatory plan/arrangement
*	Filed herewith
#	Furnished herewith

We will furnish to any of our stockholders a copy of any of the above exhibits upon the written request of such stockholder.

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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, this 28th day of April 2023.

U.S. Silica Holdings, Inc.
/s/ DONALD A. MERRIL
Name:	Donald A. Merril
Title:	Executive Vice President & Chief Financial Officer (Authorized Signatory and Principal Financial Officer)

S-1