10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_____________________________________________________

FORM 10-Q

_____________________________________________________

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

For the quarterly period ended March 31, 2021

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

Commission File Number: 001-36853

_____________________________________________________

ZILLOW GROUP, INC.

(Exact name of registrant as specified in its charter)

_____________________________________________________

Washington	47-1645716
(State or other jurisdiction of	(I.R.S. Employer
incorporation or organization)	Identification No.)

1301 Second Avenue, Floor 31,

Seattle, Washington 98101

(Address of principal executive offices) (Zip Code)

(206) 470-7000

(Registrant’s telephone number, including area code)

 _____________________________________________________ 

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

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Class A Common Stock, par value $0.0001 per share	ZG	The Nasdaq Global Select Market
Class C Capital Stock, par value $0.0001 per share	Z	The Nasdaq Global Select Market

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

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

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

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

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

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

As of April 27, 2021, 61,335,992 shares of Class A common stock, 6,217,447 shares of Class B common stock, and 180,104,154 shares of Class C capital stock were outstanding.

ZILLOW GROUP, INC.

Quarterly Report on Form 10-Q

For the Three Months Ended March 31, 2021

TABLE OF CONTENTS

		Page
	PART I – FINANCIAL INFORMATION
Item 1.	Financial Statements (unaudited)	3
	Condensed Consolidated Balance Sheets	3
	Condensed Consolidated Statements of Operations	4
	Condensed Consolidated Statements of Comprehensive Income (Loss)	5
	Condensed Consolidated Statements of Shareholders’ Equity	6
	Condensed Consolidated Statements of Cash Flows	7
	Notes to Condensed Consolidated Financial Statements	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	29
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	46
Item 4.	Controls and Procedures	48
	PART II – OTHER INFORMATION
Item 1.	Legal Proceedings	49
Item 1A.	Risk Factors	50
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	51
Item 6.	Exhibits	52
	Signatures	53

i

As used in this Quarterly Report on Form 10-Q, the terms “Zillow Group,” “the Company,” “we,” “us” and “our” refer to Zillow Group, Inc., unless the context indicates otherwise.

NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q, including Part I, Item 2 (Management’s Discussion and Analysis of Financial Condition and Results of Operations), contains forward-looking statements based on our management’s beliefs and assumptions and on information currently available to our management. Forward-looking statements include all statements that are not historical facts and generally may be identified by terms such as “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “could,” “would,” “project,” “plan,” “expect” or the negative or plural of these words or similar expressions.

These forward-looking statements are subject to a number of risks, uncertainties and assumptions, including those risks, uncertainties and assumptions described in Part I, Item 1A (Risk Factors) in our Annual Report on Form 10-K for the year ended December 31, 2020, including, but not limited to:

•the impact of the COVID-19 pandemic or other public health crises and any associated economic downturn on our future financial position, operations and financial performance;

•the magnitude, duration and severity of the COVID-19 pandemic and the availability and widespread distribution and use of effective vaccines;

•the impact of actions taken by governments, businesses and individuals in response to the COVID-19 pandemic, including changes in laws or regulations that limit our ability to operate;

•the current and future health and stability of the economy, financial conditions and residential housing market, including any extended slowdown in the real estate markets as a result of the COVID-19 pandemic;

•changes in laws or regulations applicable to our business, employees, products or services, including current and future laws, regulations and orders that limit our ability to operate in light of the COVID-19 pandemic;

•the satisfaction of conditions precedent to the closing of Zillow Group’s proposed acquisition of ShowingTime.com, Inc., including expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Act;

•changes in general economic and financial conditions that reduce demand for our products and services, lower our profitability or reduce our access to credit;

•actual or anticipated fluctuations in our financial condition and results of operations;

•changes in projected operational and financial results;

•addition or loss of significant customers;

•actual or anticipated changes in our growth rate relative to that of our competitors;

•acquisitions, strategic partnerships, joint ventures, capital-raising activities or other corporate transactions or commitments by us or our competitors;

•actual or anticipated changes in technology, products, markets or services by us or our competitors;

•ability to obtain or maintain licenses and permits to support our current and future businesses;

•ability to comply with MLS rules and requirements to access and use listing data, and to maintain or establish relationships with listings and data providers;

•ability to operate our mortgage originations business, including the ability to obtain sufficient financing;

•fluctuations in the valuation of companies perceived by investors to be comparable to us;

•the impact of natural disasters and other catastrophic events;

•the impact of pending or future litigation; and

•issuance of new or updated research or reports by securities analysts.

Moreover, we operate in a very competitive and rapidly changing environment. New risks emerge from time to time. It is not possible for our management to predict all risks, nor can we assess the effect of all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements we may make. In light of these risks, uncertainties and assumptions, the forward-looking events and circumstances discussed in this report may not occur and actual results could differ materially and adversely from those anticipated or implied in the forward-looking statements.

You should not rely on forward-looking statements as predictions of future events. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee that the future results, levels of activity, performance or events and circumstances reflected in the forward-looking statements will be achieved or occur. Moreover, except as required by law, neither we nor any other person assumes responsibility for the accuracy and completeness of the forward-looking statements, and we undertake no obligation to update publicly any forward-looking statements for any reason after the date of this report to conform these statements to actual results or to changes in our expectations.

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WHERE YOU CAN FIND MORE INFORMATION

Our filings with the Securities and Exchange Commission, or SEC, including our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports, are available on the “Investors” section of our website at www.zillowgroup.com, free of charge, as soon as reasonably practicable after the electronic filing of these reports with the SEC. The information contained on our website is not a part of this Quarterly Report on Form 10-Q or any other document we file with the SEC.

Investors and others should note that Zillow Group announces material financial information to its investors using its press releases, SEC filings and public conference calls and webcasts. Zillow Group intends to also use the following channels as a means of disclosing information about Zillow Group, its services and other matters and for complying with its disclosure obligations under Regulation FD:

•Zillow Group Investor Relations Webpage (http://investors.zillowgroup.com)

•Zillow Group Investor Relations Blog (http://www.zillowgroup.com/ir-blog)

•Zillow Group Twitter Account (https://twitter.com/zillowgroup)

The information Zillow Group posts through these channels may be deemed material. Accordingly, investors should monitor these channels, in addition to following Zillow Group’s press releases, SEC filings and public conference calls and webcasts. This list may be updated from time to time. The information we post through these channels is not a part of this Quarterly Report on Form 10-Q or any other document we file with the SEC, and the inclusion of our website addresses and Twitter account are as inactive textual references only.

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PART I – FINANCIAL INFORMATION

Item 1. Financial Statements (unaudited)

ZILLOW GROUP, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(in thousands, except share data, unaudited)

	March 31, 2021		December 31, 2020
Assets
Current assets:
Cash and cash equivalents	$	3,401,762	$	1,703,130
Short-term investments	1,294,051		2,218,108
Accounts receivable, net of allowance for doubtful accounts of $3,460 and $3,427 at March 31, 2021 and December 31, 2020, respectively	82,461		69,940
Mortgage loans held for sale	274,319		330,758
Inventory	472,397		491,293
Prepaid expenses and other current assets	107,877		75,846
Restricted cash	120,713		75,805
Total current assets	5,753,580		4,964,880
Contract cost assets	50,182		50,719
Property and equipment, net	190,234		196,152
Right of use assets	180,610		187,960
Goodwill	1,984,907		1,984,907
Intangible assets, net	87,711		94,767
Other assets	8,678		7,175
Total assets	$	8,255,902	$	7,486,560
Liabilities and shareholders’ equity
Current liabilities:
Accounts payable	$	17,044	$	18,974
Accrued expenses and other current liabilities	121,692		94,487
Accrued compensation and benefits	49,844		47,666
Borrowings under credit facilities	662,175		670,209
Deferred revenue	54,192		48,995
Lease liabilities, current portion	28,465		28,310
Total current liabilities	933,412		908,641
Lease liabilities, net of current portion	200,762		207,723
Convertible senior notes	1,597,205		1,613,523
Other long-term liabilities	14,485		14,857
Total liabilities	2,745,864		2,744,744
Commitments and contingencies (Note 16)
Shareholders’ equity:
Preferred stock, $0.0001 par value; 30,000,000 shares authorized; no shares issued and outstanding	—		—
Class A common stock, $0.0001 par value; 1,245,000,000 shares authorized; 61,335,992 and 61,101,303 shares issued and outstanding as of March 31, 2021 and December 31, 2020, respectively	6		6
Class B common stock, $0.0001 par value; 15,000,000 shares authorized; 6,217,447 shares issued and outstanding	1		1
Class C capital stock, $0.0001 par value; 600,000,000 shares authorized; 179,754,423 and 173,207,170 shares issued and outstanding as of March 31, 2021 and December 31, 2020, respectively	18		17
Additional paid-in capital	6,596,850		5,880,883
Accumulated other comprehensive income	454		164
Accumulated deficit	(1,087,291)		(1,139,255)
Total shareholders’ equity	5,510,038		4,741,816
Total liabilities and shareholders’ equity	$	8,255,902	$	7,486,560

See accompanying notes to the condensed consolidated financial statements.

3

ZILLOW GROUP, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share data, unaudited)

	Three Months Ended March 31,
	2021		2020
Revenue:
Homes	$	704,152	$	769,873
IMT	446,328		330,666
Mortgages	67,960		25,282
Total revenue	1,218,440		1,125,821
Cost of revenue (exclusive of amortization) (1):
Homes	640,618		732,199
IMT	28,016		24,318
Mortgages	18,396		5,155
Total cost of revenue	687,030		761,672
Sales and marketing	193,593		204,648
Technology and development	148,856		134,918
General and administrative	100,551		92,285
Impairment costs	—		76,800
Acquisition-related costs	817		—
Total costs and expenses	1,130,847		1,270,323
Income (loss) from operations	87,593		(144,502)
Loss on extinguishment of debt	(1,403)		—
Other income	2,439		9,593
Interest expense	(39,555)		(37,592)
Income (loss) before income taxes	49,074		(172,501)
Income tax benefit	2,890		9,228
Net income (loss)	$	51,964	$	(163,273)
Net income (loss) per share:
Basic	$	0.21	$	(0.78)
Diluted	$	0.20	$	(0.78)
Weighted-average shares outstanding:
Basic	243,234		210,674
Diluted	259,346		210,674
____________________ (1) Amortization of website development costs and intangible assets included in technology and development	$	20,838	$	17,184

See accompanying notes to the condensed consolidated financial statements.

4

ZILLOW GROUP, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(in thousands, unaudited)

	Three Months Ended March 31,
	2021		2020
Net income (loss)	$	51,964	$	(163,273)
Other comprehensive income:
Unrealized gains on investments	261		3,602
Reclassification adjustment for net investment gains included in net income (loss)	—		434
Net unrealized gains on investments	261		4,036
Currency translation adjustments	29		(90)
Total other comprehensive income	290		3,946
Comprehensive income (loss)	$	52,254	$	(159,327)

See accompanying notes to the condensed consolidated financial statements.

5

ZILLOW GROUP, INC.

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY

(in thousands, except share data, unaudited)

	Class A Common Stock, Class B Common Stock and Class C Capital Stock			Additional Paid-In Capital		Accumulated Deficit		Accumulated Other Comprehensive Income		Total Shareholders’ Equity
	Shares	Amount
Balance at January 1, 2021	240,525,920	$	24	$	5,880,883	$	(1,139,255)	$	164	$	4,741,816
Issuance of common and capital stock upon exercise of stock options	1,602,896	—		61,149		—		—		61,149
Vesting of restricted stock units	813,471	—		—		—		—		—
Restricted stock units withheld for tax liability	(622)	—		(124)		—		—		(124)
Share-based compensation expense	—	—		67,386		—		—		67,386
Issuance of Class C capital stock in connection with equity offering, net of issuance costs of $6,054	3,163,502	1		544,557		—		—		544,558
Conversion of convertible senior notes	1,202,720	—		42,999		—		—		42,999
Unwind of capped call transactions	(25)	—		—		—		—		—
Net income	—	—		—		51,964		—		51,964
Other comprehensive income	—	—		—		—		290		290
Balance at March 31, 2021	247,307,862	$	25	$	6,596,850	$	(1,087,291)	$	454	$	5,510,038

	Class A Common Stock, Class B Common Stock and Class C Capital Stock			Additional Paid-In Capital		Accumulated Deficit		Accumulated Other Comprehensive Income		Total Shareholders’ Equity
	Shares	Amount
Balance at January 1, 2020	209,066,855	$	21	$	4,412,200	$	(977,140)	$	340	$	3,435,421
Issuance of common and capital stock upon exercise of stock options	3,207,375	1		92,201		—		—		92,202
Vesting of restricted stock units	638,909	—		—		—		—		—
Share-based compensation expense	—	—		47,465		—		—		47,465
Net loss	—	—		—		(163,273)		—		(163,273)
Other comprehensive income	—	—		—		—		3,946		3,946
Balance at March 31, 2020	212,913,139	$	22	$	4,551,866	$	(1,140,413)	$	4,286	$	3,415,761

See accompanying notes to the condensed consolidated financial statements.

6

ZILLOW GROUP, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands, unaudited)

	Three Months Ended March 31,
	2021		2020
Operating activities
Net income (loss)	$	51,964	$	(163,273)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	28,899		29,026
Share-based compensation expense	63,673		43,795
Amortization of right of use assets	7,350		6,465
Amortization of contract cost assets	10,130		8,415
Amortization of debt discount and debt issuance costs	25,271		22,547
Loss on extinguishment of debt	1,403		—
Impairment costs	—		76,800
Deferred income taxes	(2,890)		(9,228)
Loss on disposal of property and equipment and other assets	4,418		1,952
Credit loss expense	128		558
Net loss on investment securities	—		434
Amortization (accretion) of bond premium (discount)	4,014		(473)
Changes in operating assets and liabilities:
Accounts receivable	(12,649)		(5,335)
Mortgage loans held for sale	56,439		(341)
Inventory	18,893		302,593
Prepaid expenses and other assets	(28,643)		(2,916)
Contract cost assets	(9,593)		(9,771)
Lease liabilities	(6,806)		(1,625)
Accounts payable	(2,235)		7,673
Accrued expenses and other current liabilities	24,889		4,588
Accrued compensation and benefits	2,178		(4,967)
Deferred revenue	5,197		(4,400)
Other long-term liabilities	(372)		(527)
Net cash provided by operating activities	241,658		301,990
Investing activities
Proceeds from maturities of investments	920,304		296,272
Proceeds from sales of investments	—		53,997
Purchases of investments	—		(58,459)
Purchases of property and equipment	(11,485)		(32,966)
Purchases of intangible assets	(4,485)		(4,503)
Net cash provided by investing activities	904,334		254,341
Financing activities
Proceeds from issuance of Class C capital stock, net of issuance costs	544,557		—
Proceeds from borrowings on credit facilities	126,010		34,460
Repayments of borrowings on credit facilities	(88,340)		(294,150)
Net borrowings (repayments) on warehouse line of credit and repurchase agreements	(45,704)		4,386
Proceeds from exercise of stock options	61,149		92,202
Value of equity awards withheld for tax liability	(124)		—
Net cash provided by (used in) financing activities	597,548		(163,102)
Net increase in cash, cash equivalents and restricted cash during period	1,743,540		393,229
Cash, cash equivalents and restricted cash at beginning of period	1,778,935		1,230,909
Cash, cash equivalents and restricted cash at end of period	$	3,522,475	$	1,624,138
Supplemental disclosures of cash flow information
Cash paid for interest	$	14,191	$	17,038
Noncash transactions:
Capitalized share-based compensation	$	3,713	$	3,670
Write-off of fully depreciated property and equipment	$	11,603	$	4,143
Write-off of fully amortized intangible assets	$	1,300	$	—
Property and equipment purchased on account	$	905	$	9,445

See accompanying notes to the condensed consolidated financial statements.

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ZILLOW GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

Note 1. Organization and Description of Business

Zillow Group, Inc. is reimagining real estate to make it easier to unlock life’s next chapter. As the most visited real estate website in the United States, Zillow and its affiliates offer customers an on-demand experience for selling, buying, renting or financing with transparency and nearly seamless end-to-end service. Zillow Offers buys and sells homes directly in dozens of markets across the country, allowing sellers control over their timeline. Zillow Home Loans, our affiliate lender, provides our customers with an easy option to get pre-approved and secure financing for their next home purchase. In September 2020, Zillow launched Zillow Homes, Inc., a licensed brokerage entity, to streamline Zillow Offers transactions.

Other consumer brands include Trulia, StreetEasy, HotPads and Out East. In addition, Zillow Group provides a comprehensive suite of marketing software and technology solutions which include Mortech, dotloop, Bridge Interactive and New Home Feed. Zillow, Inc. was incorporated as a Washington corporation in December 2004, and we launched the initial version of our website, Zillow.com, in February 2006. Zillow Group, Inc. was incorporated as a Washington corporation in July 2014 in connection with our acquisition of Trulia, Inc. (“Trulia”), and upon the closing of the Trulia acquisition in February 2015, each of Zillow, Inc. and Trulia became wholly owned subsidiaries of Zillow Group, Inc.

Certain Significant Risks and Uncertainties

We operate in a dynamic industry and, accordingly, can be affected by a variety of factors. For example, we believe that changes in any of the following areas could have a significant negative effect on us in terms of our future financial position, results of operations or cash flows: public health crises, like the COVID-19 pandemic and the availability and widespread distribution and use of effective vaccines; rates of revenue growth; our ability to successfully integrate and realize the benefits of our past or future strategic acquisitions or investments; the satisfaction of conditions precedent to the closing of our proposed acquisition of ShowingTime.com, Inc., including expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Act; our ability to manage advertising inventory or pricing; engagement and usage of our products; our investment of resources to pursue strategies that may not prove effective; competition in our market; the stability of the residential real estate market and the impact of interest rate changes; changes in technology, products, markets or services by us or our competitors; addition or loss of significant customers; our ability to maintain or establish relationships with listings and data providers; our ability to obtain or maintain licenses and permits to support our current and future businesses; actual or anticipated changes to our products and services; changes in government regulation affecting our business; outcomes of legal proceedings; natural disasters and catastrophic events; scaling and adaptation of existing technology and network infrastructure; management of our growth; our ability to attract and retain qualified employees and key personnel; protection of customers’ information and other privacy concerns; protection of our brand and intellectual property; and intellectual property infringement and other claims, among other things.

Note 2. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying condensed consolidated financial statements include Zillow Group, Inc. and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. These condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Accordingly, these interim condensed consolidated financial statements should be read in conjunction with the audited financial statements and accompanying notes included in Zillow Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2020, which was filed with the SEC on February 12, 2021. The condensed consolidated balance sheet as of December 31, 2020, included herein, was derived from the audited financial statements of Zillow Group, Inc. as of that date.

The unaudited condensed consolidated interim financial statements, in the opinion of management, reflect all adjustments, consisting only of normal recurring adjustments, necessary to present fairly our financial position as of March 31, 2021 and our results of operations, comprehensive income (loss), shareholders’ equity and cash flows for the three months ended March 31, 2021 and 2020. The results for the three months ended March 31, 2021 are not necessarily indicative of the results to be expected for the year ending December 31, 2021 or for any interim period or for any other future year.

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Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and the related disclosures at the date of the financial statements, as well as the reported amounts of revenue and expenses during the periods presented. On an ongoing basis, we evaluate our estimates, including those related to the accounting for certain revenue offerings, the net realizable value of inventory, amortization period and recoverability of contract cost assets, website and software development costs, recoverability of long-lived assets and intangible assets, share-based compensation, income taxes, business combinations and the recoverability of goodwill, among others. To the extent there are material differences between these estimates, judgments or assumptions and actual results, our financial statements will be affected. The COVID-19 pandemic has introduced significant additional uncertainty with respect to estimates, judgments and assumptions, which may materially impact the estimates previously listed, among others.

Recently Adopted Accounting Standards

In December 2019, the Financial Accounting Standards Board (“FASB”) issued guidance which is intended to simplify the accounting for income taxes. It removes certain exceptions to the general principles and clarifies and amends existing guidance to improve consistent application. This guidance is effective for interim and annual periods beginning after December 15, 2020, and early adoption is permitted. We adopted this guidance on January 1, 2021. The method of adoption for this guidance varies based on the amendment, however the relevant amendments have been applied on a prospective basis. The adoption of this guidance did not have a material impact on our financial position, results of operations or cash flows.

Recently Issued Accounting Standards Not Yet Adopted

In August 2020, the FASB issued guidance which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts in an entity’s own equity. Among other changes, the guidance removes the liability and equity separation models for convertible instruments. Instead, entities will account for convertible debt instruments wholly as debt unless convertible instruments contain features that require bifurcation as a derivative or that result in substantial premiums accounted for as paid-in capital. The guidance also requires the application of the if-converted method to calculate the impact of convertible instruments on diluted earnings per share. The guidance is effective for fiscal years beginning after December 15, 2021, with early adoption permitted for fiscal years beginning after December 15, 2020, and can be adopted on either a retrospective or modified retrospective basis. We expect to adopt this guidance on January 1, 2022. Although we continue to evaluate the method of adoption and impact of this guidance on our financial position, results of operations and cash flows, upon adoption we expect this guidance to result in a reclassification of conversion feature balances from additional paid-in capital to debt and to decrease reported interest expense for our convertible senior notes.

In March 2020, the FASB issued guidance which provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions that reference the London Inter-Bank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued because of reference rate reform. This guidance is optional 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. This guidance is effective from March 12, 2020 through December 31, 2022. Entities may elect to adopt the amendments for contract modifications 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. We expect to apply some of the expedients and exceptions provided in this guidance to our credit facilities, warehouse line of credit and master repurchase agreements, all of which reference the one-month LIBOR in the applicable interest rate, as publication of the one-month LIBOR is expected to cease after June 30, 2023. We expect to amend our facility agreements prior to that date. As the goal of the reference rate reform transition is for it to be economically neutral to entities, we do not believe the adoption of this guidance will have a material impact on our financial position, results of operations or cash flows.

Note 3. Fair Value Measurements

We applied the following methods and assumptions in estimating our fair value measurements:

Cash equivalents — The fair value measurement of money market funds is based on quoted market prices in active markets (Level 1). The fair value measurement of other cash equivalents is based on observable market-based inputs principally derived from or corroborated by observable market data (Level 2).

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Short-term investments — The fair value measurement of our short-term investments is based on observable market-based inputs or inputs that are derived principally from or corroborated by observable market data by correlation or other means (Level 2).

Restricted cash — The carrying value of restricted cash approximates fair value due to the short period of time amounts borrowed on the credit facilities are outstanding and amounts are held in escrow (Level 1).

Mortgage loans held for sale — The fair value of mortgage loans held for sale is generally calculated by reference to quoted prices in secondary markets for commitments to sell mortgage loans with similar characteristics (Level 2).

Interest rate lock commitments — The fair value of interest rate lock commitments (“IRLCs”) is calculated by reference to quoted prices in secondary markets for commitments to sell mortgage loans with similar characteristics. Expired commitments are excluded from the fair value measurement. Since not all IRLCs will become closed loans, we adjust our fair value measurements for the estimated amount of IRLCs that will not close. This adjustment is effected through the pull-through rate, which represents the probability that an interest rate lock commitment will ultimately result in a closed loan (Level 3).

The following table presents the range and weighted-average pull-through rates used in determining the fair value of IRLCs as of the dates presented:

	March 31, 2021	December 31, 2020
Range	50% - 100%	47% - 100%
Weighted-average	81%	75%

Forward contracts — The fair value of mandatory loan sales commitments and derivative instruments such as forward sales of mortgage-backed securities that are utilized as economic hedging instruments are calculated by reference to quoted prices for similar assets (Level 2).

The following tables present the balances of assets and liabilities measured at fair value on a recurring basis, by level within the fair value hierarchy, as of the dates presented (in thousands):

	March 31, 2021
	Total		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	3,074,175	$	3,074,175	$	—	$	—
Short-term investments:
U. S. government agency securities	988,774		—		988,774		—
Treasury bills	298,984		—		298,984		—
Municipal securities	6,044		—		6,044		—
Certificates of deposit	249		—		249		—
Restricted cash	120,713		120,713		—		—
Mortgage origination-related:
Mortgage loans held for sale	274,319		—		274,319		—
IRLCs	5,002		—		—		5,002
Forward contracts - other current assets	4,946		—		4,946		—
Forward contracts - other current liabilities	(16)		—		(16)		—
Total	$	4,773,190	$	3,194,888	$	1,573,300	$	5,002

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	December 31, 2020
	Total		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	1,486,384	$	1,486,384	$	—	$	—
Municipal securities	3,228		—		3,228		—
Short-term investments:
Treasury bills	1,163,813		—		1,163,813		—
U. S. government agency securities	1,037,577		—		1,037,577		—
Municipal securities	16,220		—		16,220		—
Certificates of deposit	498		—		498		—
Restricted cash	75,805		75,805		—		—
Mortgage origination-related:
Mortgage loans held for sale	330,758		—		330,758		—
IRLCs	12,342		—		—		12,342
Forward contracts - other current liabilities	(2,608)		—		(2,608)		—
Total	$	4,124,017	$	1,562,189	$	2,549,486	$	12,342

The following table presents the changes in our IRLCs during the three months ended March 31, 2021 (in thousands):

	Three Months Ended March 31, 2021		Three Months Ended March 31, 2020
Balance, beginning of the period	$	12,342	$	937
Issuances	18,301		5,208
Transfers	(24,398)		(5,349)
Fair value changes recognized in earnings	(1,243)		1,429
Balance, end of period	$	5,002	$	2,225

At March 31, 2021, the notional amounts of the hedging instruments related to our mortgage loans held for sale were $336.2 million and $560.0 million for our IRLCs and forward contracts, respectively. At December 31, 2020, the notional amounts of the hedging instruments related to our mortgage loans held for sale were $378.1 million and $652.1 million for our IRLCs and forward contracts, respectively. We do not have the right to offset our derivative positions.

See Note 11 for the carrying amount and estimated fair value of our convertible senior notes.

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Note 4. Cash and Cash Equivalents, Short-term Investments and Restricted Cash

The following tables present the amortized cost, gross unrealized gains and losses and estimated fair market value of our cash and cash equivalents, short-term investments and restricted cash as of the dates presented (in thousands):

	March 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Market Value
Cash	$	327,587	$	—	$	—	$	327,587
Cash equivalents:
Money market funds	3,074,175		—		—		3,074,175
Short-term investments:
U. S. government agency securities	988,478		303		(7)		988,774
Treasury bills	298,953		31		—		298,984
Municipal securities	6,046		—		(2)		6,044
Certificates of deposit	249		—		—		249
Restricted cash	120,713		—		—		120,713
Total	$	4,816,201	$	334	$	(9)	$	4,816,526

	December 31, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Market Value
Cash	$	213,518	$	—	$	—	$	213,518
Cash equivalents:
Money market funds	1,486,384		—		—		1,486,384
Municipal securities	3,229		—		(1)		3,228
Short-term investments:
Treasury bills	1,163,748		65		—		1,163,813
U.S. government agency securities	1,037,572		57		(52)		1,037,577
Municipal securities	16,226		—		(6)		16,220
Certificates of deposit	498		—		—		498
Restricted cash	75,805		—		—		75,805
Total	$	3,996,980	$	122	$	(59)	$	3,997,043

All short-term investments as of March 31, 2021 have a contractual maturity date of one year or less.

Note 5. Inventory

The following table presents the components of inventory, net of applicable lower of cost or net realizable value adjustments, as of the dates presented (in thousands):

	March 31, 2021		December 31, 2020
Finished goods	$	341,887	$	339,372
Work-in-process	130,510		151,921
Inventory	$	472,397	$	491,293

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Note 6. Contract Balances

Contract assets were $34.3 million and $20.8 million as of March 31, 2021 and December 31, 2020, respectively. Contract assets are recorded within prepaids and other current assets in our condensed consolidated balance sheets.

For the three months ended March 31, 2021 and 2020, we recognized revenue of $46.5 million and $36.0 million, respectively, that was included in the deferred revenue balance at the beginning of the related period.

Note 7. Contract Cost Assets

As of March 31, 2021 and December 31, 2020, we had $50.2 million and $50.7 million, respectively, of contract cost assets. During the three months ended March 31, 2021 and 2020, we did not incur any impairment losses to our contract cost assets. We recorded amortization expense related to contract cost assets of $10.1 million and $8.4 million during the three months ended March 31, 2021 and 2020, respectively.

Note 8. Property and Equipment, net

The following table presents the detail of property and equipment as of the dates presented (in thousands):

	March 31, 2021		December 31, 2020
Website development costs	$	110,971	$	95,466
Leasehold improvements	102,632		110,280
Office equipment, furniture and fixtures	34,561		39,607
Construction-in-progress	32,553		44,151
Computer equipment	20,209		20,433
Property and equipment	300,926		309,937
Less: accumulated amortization and depreciation	(110,692)		(113,785)
Property and equipment, net	$	190,234	$	196,152

We recorded depreciation expense related to property and equipment (other than website development costs) of $7.9 million and $11.8 million during the three months ended March 31, 2021 and 2020, respectively.

We capitalized $12.4 million and $12.5 million in website development costs during the three months ended March 31, 2021 and 2020, respectively. Amortization expense for website development costs included in technology and development expenses was $8.0 million and $5.4 million during the three months ended March 31, 2021 and 2020, respectively.

Note 9. Equity Investment

In October 2016, we purchased a 10% equity interest in a privately held variable interest entity within the real estate industry for $10.0 million. In March 2020, we recognized a non-cash impairment charge of $5.3 million related to this investment. The impairment charge is included in impairment costs within our IMT segment for the three months ended March 31, 2020. We sold our 10% equity interest in June 2020.

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Note 10. Intangible Assets, net

The following tables present the detail of intangible assets as of the dates presented (in thousands):

	March 31, 2021
	Cost		Accumulated Amortization		Net
Trade names and trademarks	$	36,500	$	(5,105)	$	31,395
Software	33,764		(13,155)		20,609
Developed technology	86,064		(73,507)		12,557
Customer relationships	87,600		(76,429)		11,171
Intangibles-in-progress	9,886		—		9,886
Purchased content	49,565		(47,472)		2,093
Total	$	303,379	$	(215,668)	$	87,711

	December 31, 2020
	Cost		Accumulated Amortization		Net
Trade names and trademarks	$	36,500	$	(3,822)	$	32,678
Software	28,515		(11,483)		17,032
Developed technology	86,064		(70,270)		15,794
Customer relationships	87,600		(73,301)		14,299
Intangibles-in-progress	11,863		—		11,863
Purchased content	47,930		(44,829)		3,101
Total	$	298,472	$	(203,705)	$	94,767

Amortization expense recorded for intangible assets for the three months ended March 31, 2021 and 2020 was $12.9 million and $11.8 million, respectively. These amounts are included in technology and development expenses.

We did not record any impairment costs related to our intangible assets for the three months ended March 31, 2021. During the three months ended March 31, 2020, we recognized a non-cash impairment charge of $71.5 million related to our Trulia trade names and trademarks intangible asset, which historically had not been subject to amortization. The impairment charge is included in impairment costs within our IMT and Mortgages segments. In March 2020, we identified factors directly related to the COVID-19 pandemic that led us to conclude it was more likely than not that the $108.0 million carrying value of the asset exceeded its fair value. Accordingly, with the assistance of a third-party valuation specialist, we performed a quantitative analysis to determine the fair value of the intangible asset and concluded that our best estimate of its fair value was $36.5 million. The remaining carrying value of the intangible asset will be amortized on an accelerated basis commensurate with the projected cash flows expected to be generated by the intangible asset over a useful life of 10 years. The carrying value of the Trulia trade names and trademarks intangible asset was $31.4 million and $32.7 million as of March 31, 2021 and December 31, 2020, respectively. For additional details regarding this impairment, see Note 11 in the Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

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Note 11. Debt

The following table presents the carrying values of Zillow Group’s debt as of the dates presented (in thousands):

	March 31, 2021		December 31, 2020
Homes segment
Credit facilities:
Goldman Sachs Bank USA	$	190,176	$	145,825
Citibank, N.A.	109,732		87,103
Credit Suisse AG, Cayman Islands	98,928		128,238
Total Homes segment debt	398,836		361,166
Mortgages segment
Repurchase agreements:
Credit Suisse AG, Cayman Islands	132,001		149,913
Citibank, N.A.	50,546		90,227
Warehouse line of credit:
Comerica Bank	80,792		68,903
Total Mortgages segment debt	263,339		309,043
Convertible senior notes
1.375% convertible senior notes due 2026	352,077		347,566
2.75% convertible senior notes due 2025	421,770		414,888
0.75% convertible senior notes due 2024	493,044		524,273
1.50% convertible senior notes due 2023	330,314		326,796
Total convertible senior notes	1,597,205		1,613,523
Total debt	$	2,259,380	$	2,283,732

Homes Segment

To provide capital for Zillow Offers, we utilize credit facilities that are classified as current liabilities in our condensed consolidated balance sheets. We classify these credit facilities as current liabilities as amounts drawn to purchase homes are typically due as homes are sold, which we expect to be within one year. The following table summarizes certain details related to our credit facilities (in thousands, except interest rates):

Lender	Final Maturity Date	Maximum Borrowing Capacity		Weighted-Average Interest Rate
Goldman Sachs Bank USA	April 20, 2022	$	500,000	3.15	%
Citibank, N.A.	November 30, 2021	500,000		2.86	%
Credit Suisse AG, Cayman Islands	December 31, 2022	500,000		2.86	%
	Total	$	1,500,000

On January 6, 2021, certain wholly owned subsidiaries of Zillow Group amended the Credit Suisse AG, Cayman Islands credit agreement previously maturing on July 31, 2021 such that it now matures on December 31, 2022.

Undrawn amounts available under the credit facilities included in the table above are not committed, meaning the applicable lender is not committed to, but may in its discretion, advance loan funds in excess of the outstanding borrowings. The final maturity dates are inclusive of extensions which are subject to agreement by the respective lender.

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On February 23, 2021, certain wholly owned subsidiaries of Zillow Group amended and restated the Citibank, N.A. credit agreement in order to facilitate a titling trust structure. In March 2021, Zillow Group, through Zillow Offers, began buying and selling homes through a titling trust. The titling trust facilitates the allocation of beneficial ownership of properties to special purpose entities (each, an “SPE”), which special purpose entities are then party to agreements to finance the properties. Zillow Group initially formed these SPEs to purchase and sell residential properties through Zillow Offers, and subsequent to the creation of the titling trust, these SPEs hold beneficial interests in homes purchased by the titling trust, which the SPEs subsequently finance. Each SPE is a wholly owned subsidiary of Zillow Group and a separate legal entity, and neither the assets nor credit of any such SPE are available to satisfy the debts and other obligations of any affiliate or other entity. The credit facilities are secured by the assets and equity of one or more SPEs. These SPEs and titling trust are variable interest entities and Zillow Group is the primary beneficiary as it has the power to control the activities that most significantly impact the SPEs’ and titling trust’s economic performance and the obligation to absorb losses of the SPEs and titling trust or the right to receive benefits that could potentially be significant to the SPEs and titling trust. The SPEs and titling trust are consolidated within Zillow Group’s condensed consolidated financial statements. As of March 31, 2021 and December 31, 2020, the total assets of the SPEs and titling trust were $573.6 million and $551.2 million, respectively, of which $471.9 million and $491.3 million are inventory, respectively, $83.2 million and $53.0 million are restricted cash, respectively, and $16.4 million and $3.9 million are accounts receivable, respectively. As of March 31, 2021 and December 31, 2020, the total liabilities of the SPEs and titling trust were $411.6 million and $372.5 million, respectively, of which $398.8 million and $361.2 million are credit facility borrowings, respectively, and $9.9 million and $10.8 million are accrued expenses, respectively.

Outstanding amounts drawn under each credit facility are required to be repaid on the facility maturity date or earlier if accelerated due to an event of default. Further, each SPE is required to repay any resulting shortfall if the value of the eligible properties owned by such SPE falls below a certain percentage of the principal amount outstanding under the applicable credit facility. Continued inclusion of properties in each credit facility is subject to various eligibility criteria. For example, aging criteria limit the inclusion in the borrowing base of properties owned longer than a specified number of days, and properties owned for longer than one year are generally ineligible.

The stated interest rate on our credit facilities is one-month LIBOR plus an applicable margin, and in certain cases include a LIBOR floor, as defined in the respective credit agreements. Our credit facilities include customary representations and warranties, provisions regarding events of default and covenants. The terms of these credit facilities and related financing documents require Zillow Group and certain of its subsidiaries, as applicable, to comply with a number of customary financial and other covenants, such as maintaining certain levels of liquidity, tangible net worth and leverage ratios. As of March 31, 2021, Zillow Group was in compliance with all financial covenants and no event of default had occurred. Except for certain limited circumstances, the credit facilities are non-recourse to Zillow Group. Our credit facilities require that we establish, maintain and in certain circumstances that Zillow Group fund specified reserve accounts. These reserve accounts include, but are not limited to, interest reserves, insurance reserves, tax reserves, renovation cost reserves and reserves for specially permitted liens. Amounts funded to these reserve accounts and the collection accounts have been classified within our condensed consolidated balance sheets as restricted cash.

Mortgages Segment

To provide capital for Zillow Home Loans, we utilize master repurchase agreements and a warehouse line of credit which are classified as current liabilities in our condensed consolidated balance sheets. The repurchase agreements and warehouse line of credit provide short-term financing between the issuance of a mortgage loan and when Zillow Home Loans sells the loan to an investor or directly to an agency. The following table summarizes certain details related to our repurchase agreements and warehouse line of credit (in thousands, except interest rates):

Lender	Maturity Date	Maximum Borrowing Capacity		Weighted-Average Interest Rate
Credit Suisse AG, Cayman Islands	March 18, 2022	$	300,000	2.50	%
Citibank, N.A.	October 26, 2021	100,000		1.86	%
Comerica Bank	June 26, 2021	100,000		3.01	%
	Total	$	500,000

On March 19, 2021, Zillow Home Loans amended its Credit Suisse AG, Cayman Islands (“Credit Suisse”) master repurchase agreement to increase the uncommitted total maximum borrowing capacity to $300.0 million with a maturity date of March 18, 2022. The repurchase agreement with Citibank, N.A. includes a committed amount of $25.0 million.

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In accordance with the master repurchase agreements, Credit Suisse and Citibank, N.A. (together the “Lenders”) have agreed to pay Zillow Home Loans a negotiated purchase price for eligible loans, and Zillow Home Loans has simultaneously agreed to repurchase such loans from the Lenders under a specified timeframe at an agreed upon price that includes interest. The master repurchase agreements contain margin call provisions that provide the Lenders with certain rights in the event of a decline in the market value of the assets purchased under the master repurchase agreements. As of March 31, 2021 and December 31, 2020, $189.9 million and $240.1 million, respectively, in mortgage loans held for sale were pledged as collateral under the master repurchase agreements.

On February 4, 2021, Zillow Home Loans amended its Comerica Bank warehouse line of credit to increase the total maximum borrowing capacity to $100.0 million with a maturity date of June 26, 2021. The warehouse line of credit with Comerica Bank is committed.

Borrowings on the repurchase agreements and warehouse line of credit bear interest at the one-month LIBOR plus an applicable margin, and in certain cases include a LIBOR floor, as defined in the governing agreements, and are secured by residential mortgage loans held for sale. The repurchase agreements and warehouse line of credit include customary representations and warranties, covenants and provisions regarding events of default. As of March 31, 2021, Zillow Home Loans was in compliance with all financial covenants and no event of default had occurred. The repurchase agreements and warehouse line of credit are recourse to Zillow Home Loans, and have no recourse to Zillow Group or any of its other subsidiaries.

For additional details related to our warehouse line of credit and repurchase agreements, see Note 14 in the Notes to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

Convertible Senior Notes

The following tables summarize certain details related to our outstanding convertible senior notes as of the dates presented or for the periods ended (in thousands, except interest rates):

									March 31, 2021				December 31, 2020
Maturity Date	Aggregate Principal Amount		Stated Interest Rate		Effective Interest Rate		First Interest Payment Date	Semi-Annual Interest Payment Dates	Unamortized Debt Discount and Debt Issuance Costs		Fair Value		Unamortized Debt Discount and Debt Issuance Costs		Fair Value
September 1, 2026	$	498,800	1.375	%	8.10	%	March 1, 2020	March 1; September 1	$	146,723	$	1,476,837	$	152,434	$	1,508,675
May 15, 2025	565,000		2.75	%	10.32	%	November 15, 2020	May 15; November 15	143,230		1,172,674		150,112		1,168,855
September 1, 2024	622,382		0.75	%	7.69	%	March 1, 2020	March 1; September 1	129,338		1,854,113		148,727		2,023,280
July 1, 2023	372,825		1.50	%	6.99	%	January 1, 2019	January 1; July 1	42,511		611,522		46,954		633,039
Total	$	2,059,007							$	461,802	$	5,115,146	$	498,227	$	5,333,849

	Three Months Ended March 31, 2021								Three Months Ended March 31, 2020
Maturity Date	Contractual Coupon Interest		Amortization of Debt Discount		Amortization of Debt Issuance Costs		Interest Expense		Contractual Coupon Interest		Amortization of Debt Discount		Amortization of Debt Issuance Costs		Interest Expense
September 1, 2026	$	1,717	$	5,226	$	128	$	7,071	$	1,719	$	4,824	$	118	$	6,661
May 15, 2025	3,884		6,533		349		10,766		—		—		—		—
September 1, 2024	1,238		8,410		289		9,937		1,248		7,861		267		9,376
July 1, 2023	1,401		3,950		386		5,737		1,402		3,697		361		5,460
December 1, 2021	—		—		—		—		2,300		4,911		508		7,719
December 15, 2020	—		—		—		—		66		—		—		66
Total	$	8,240	$	24,119	$	1,152	$	33,511	$	6,735	$	21,293	$	1,254	$	29,282

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The convertible notes are senior unsecured obligations and are classified as long-term debt in our condensed consolidated balance sheets based on their contractual maturity dates. Interest on the convertible notes is paid semi-annually in arrears. The estimated fair value of the convertible senior notes was determined through consideration of quoted market prices. The fair value is classified as Level 3 due to the limited trading activity for each of the convertible senior notes.

The convertible senior notes maturing in 2026 (“2026 Notes”), 2025 (“2025 Notes”), 2024 (“2024 Notes”) and 2023 (“2023 Notes”) (together, the “Notes”) are convertible into cash, shares of Class C capital stock or a combination thereof, at our election, and may be settled as described below. The Notes will mature on their respective maturity date, unless earlier repurchased, redeemed or converted in accordance with their terms.

The following table summarizes the conversion and redemption options with respect to the Notes:

Maturity Date	Early Conversion Date	Conversion Rate	Conversion Price		Optional Redemption Date
September 1, 2026	March 1, 2026	22.9830	$	43.51	September 5, 2023
May 15, 2025	November 15, 2024	14.8810	67.20		May 22, 2023
September 1, 2024	March 1, 2024	22.9830	43.51		September 5, 2022
July 1, 2023	April 1, 2023	12.7592	78.37		July 6, 2021

The following table summarizes certain details related to the capped call confirmations with respect to certain of the convertible senior notes:

Maturity Date	Initial Cap Price		Cap Price Premium
September 1, 2026	$	80.5750	150	%
September 1, 2024	72.5175		125	%
July 1, 2023	105.45		85	%
December 1, 2021	69.19		85	%

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Each series of the Notes was convertible during the three months ended March 31, 2021, at the option of the holders. The following table summarizes the conversion activity for the Notes for the period presented (in thousands, except for share amounts):

	Three Months Ended March 31, 2021
	2023 Notes		2024 Notes		2026 Notes		Total
Aggregate principal amount converted	$	925	$	50,618	$	1,200	$	52,743
Shares of Class C capital stock issued upon conversion	11,789		1,163,352		27,579		1,202,720
Total fair value of consideration transferred (1)	$	1,643	$	153,925	$	4,204	$	159,772
Loss on extinguishment of debt:
Consideration allocated to the liability component (2)	$	841	$	41,267	$	883	$	42,991
Carrying value of the liability component, net of unamortized debt discount and debt issuance costs	818		39,927		843		41,588
Loss on extinguishment of debt	$	23	$	1,340	$	40	$	1,403
Consideration allocated to the equity component	$	802	$	112,658	$	3,321	$	116,781
(1) Total fair value of consideration transferred includes the value of shares transferred to note holders using the daily volume weighted-average price of our Class C capital stock on the conversion date and an immaterial amount of cash paid in lieu of fractional shares.
(2) Consideration allocated to the liability component is based on the fair value of the liability component immediately prior to settlement, which was calculated using a discounted cash flow analysis with a market interest rate of a similar liability that does not have an associated convertible feature.

For more than 20 trading days during the 30 consecutive trading days ended March 31, 2021, the last reported sale price of our Class C capital stock exceeded 130% of the conversion price of each series of the Notes. Accordingly, each series of the Notes is convertible at the option of the holders from April 1 through June 30, 2021. The 2026 Notes and 2024 Notes were first convertible during the three months ended September 30, 2020, and the 2025 Notes and 2023 Notes were first convertible during the three months ended March 31, 2021.

For additional details related to our convertible senior notes, see Note 14 in the Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

Note 12. Income Taxes

We are subject to federal and state income taxes in the U.S. and federal and provincial income taxes in Canada. As of March 31, 2021 and December 31, 2020, we have provided a valuation allowance against our net deferred tax assets that we believe, based on the weight of available evidence, are not more likely than not to be realized. Therefore, no material current tax liability or expense has been recorded in the condensed consolidated financial statements. We have accumulated federal tax losses of approximately $1.7 billion as of December 31, 2020, which are available to reduce future taxable income. We have accumulated state tax losses of approximately $53.2 million (tax effected) as of December 31, 2020.

We recorded an income tax benefit of $2.9 million for the three months ended March 31, 2021, primarily related to state income taxes. We recorded an income tax benefit of $9.2 million for the three months ended March 31, 2020 primarily as a result of a $9.7 million income tax benefit related to the $71.5 million non-cash impairment we recorded during the three months ended March 31, 2020 related to the Trulia trade names and trademarks intangible asset. For additional information about the non-cash impairment, see Note 10 of our condensed consolidated financial statements.

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Note 13. Shareholders’ Equity

Preferred Stock

Our board of directors has the authority to fix and determine and to amend the number of shares of any series of preferred stock that is wholly unissued or to be established and to fix and determine and to amend the designation, preferences, voting powers and limitations and the relative, participating, optional or other rights, of any series of shares of preferred stock that is wholly unissued or to be established, subject in each case to certain approval rights of holders of our outstanding Class B common stock. There was no preferred stock issued and outstanding as of March 31, 2021 or December 31, 2020.

Common and Capital Stock

Our Class A common stock has no preferences or privileges and is not redeemable. Holders of Class A common stock are entitled to one vote for each share.

Our Class B common stock has no preferences or privileges and is not redeemable. At any time after the date of issuance, each share of Class B common stock, at the option of the holder, may be converted into one share of Class A common stock, or automatically converted into Class A common stock upon the affirmative vote by or written consent of holders of a majority of the shares of the Class B common stock. Holders of Class B common stock are entitled to 10 votes for each share.

Our Class C capital stock has no preferences or privileges, is not redeemable and, except in limited circumstances, is non-voting.

Equity Distribution Agreement

On February 17, 2021, we entered into an equity distribution agreement with certain sales agents and/or principals (the “Managers”), pursuant to which we may offer and sell from time to time, through the Managers, shares of our Class C capital stock, having an aggregate gross sales price of up to $1.0 billion, in such share amounts as we may specify by notice to the Managers, in accordance with the terms and conditions set forth in the equity distribution agreement.

The following table summarizes the activity pursuant to the equity distribution agreement for the period presented (in thousands, except share and per share amounts):

	Three Months Ended March 31, 2021
Shares of Class C capital stock issued	3,163,502
Weighted-average issuance price per share	$	174.0511
Gross proceeds (1)	$	550,611

(1) Net proceeds were $544.6 million after deducting $6.1 million of commissions and other offering expenses incurred.

Note 14. Share-Based Awards

Option Awards

The following table summarizes option award activity for the three months ended March 31, 2021:

	Number of Shares Subject to Existing Options	Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2021	20,051,051	$	42.68	7.22	$	1,751,105
Granted	8,226,833	133.88
Exercised	(1,602,896)	38.15
Forfeited or cancelled	(373,388)	47.58
Outstanding at March 31, 2021	26,301,600	71.41		7.99	1,580,222
Vested and exercisable at March 31, 2021	9,411,270	39.23		6.05	851,494

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The fair value of options granted is estimated at the date of grant using the Black-Scholes-Merton option-pricing model, assuming no dividends and with the following assumptions for the periods presented:

	Three Months Ended March 31,
	2021	2020
Expected volatility	52%-55%	45%-48%
Expected dividend yield	—	—
Risk-free interest rate	0.57%-0.90%	0.87%-0.93%
Weighted-average expected life	4.50-5.75 years	5.00-5.50 years
Weighted-average fair value of options granted	$59.74	$20.75

As of March 31, 2021, there was a total of $638.0 million in unrecognized compensation cost related to unvested stock options.

Restricted Stock Units

The following table summarizes activity for restricted stock units for the three months ended March 31, 2021:

	Restricted Stock Units	Weighted- Average Grant- Date Fair Value
Unvested outstanding at January 1, 2021	7,316,557	$	48.14
Granted	930,831	138.13
Vested	(813,471)	44.96
Forfeited	(162,972)	48.73
Unvested outstanding at March 31, 2021	7,270,945	60.01

As of March 31, 2021, there was a total of $411.1 million in unrecognized compensation cost related to unvested restricted stock units.

Share-Based Compensation Expense

The following table presents the effects of share-based compensation expense in our condensed consolidated statements of operations during the periods presented (in thousands):

	Three Months Ended March 31,
	2021		2020
Cost of revenue	$	2,386	$	1,173
Sales and marketing	9,887		6,993
Technology and development	26,393		18,917
General and administrative	25,007		16,712
Total	$	63,673	$	43,795

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Note 15. Net Income (Loss) Per Share

Basic net income (loss) per share is computed by dividing net income (loss) by the weighted-average number of shares (including Class A common stock, Class B common stock and Class C capital stock) outstanding during the period. In the calculation of basic net income (loss) per share, undistributed earnings are allocated assuming all earnings during the period were distributed.

Diluted net income (loss) per share is computed by dividing net income (loss) by the weighted-average number of shares (including Class A common stock, Class B common stock and Class C capital stock) outstanding during the period and potentially dilutive Class A common stock and Class C capital stock equivalents, except in cases where the effect of the Class A common stock or Class C capital stock equivalent would be antidilutive. Potential Class A common stock and Class C capital stock equivalents consist of Class A common stock and Class C capital stock issuable upon exercise of stock options and Class A common stock and Class C capital stock underlying unvested restricted stock units using the treasury stock method. Potential Class A common stock equivalents also include Class A common stock issuable upon conversion of the convertible notes due in 2020 using the if-converted method through the date of their last conversion in December 2020.

Prior to the second half of 2020, we intended to settle the principal amount of our outstanding convertible senior notes in cash and therefore used the treasury stock method to calculate any potential dilutive effect of the conversion spread on diluted net income per share, if applicable.

Effective July 1, 2020, we can no longer assume cash settlement of the principal amount of these outstanding convertible notes, therefore share settlement is now presumed. On a prospective basis we have applied the if-converted method for calculating any potential dilutive effect of the conversion of the outstanding convertible notes on diluted net income per share, if applicable. The following table presents the maximum number of shares and conversion price per share of Class C capital stock for each of the Notes based on the aggregate principal amount outstanding as of March 31, 2021 (in thousands, except per share amounts):

Maturity Date	Shares	Conversion Price per Share
September 1, 2026	11,464	$	43.51
May 15, 2025	8,408	67.20
September 1, 2024	14,304	43.51
July 1, 2023	4,757	78.37

For the periods presented, the following table reconciles the denominators used in the basic and diluted net income (loss) per share calculations (in thousands):

	Three Months Ended March 31,
	2021	2020
Denominator for basic calculation	243,234	210,674
Effect of dilutive securities:
Option awards	12,437	—
Unvested restricted stock units	3,675	—
Denominator for dilutive calculation	259,346	210,674

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For the periods presented, the following Class A common stock and Class C capital stock equivalents were excluded from the calculations of diluted net income (loss) per share because their effect would have been antidilutive (in thousands):

	Three Months Ended March 31,
	2021	2020
Weighted-average Class A common stock and Class C capital stock option awards outstanding	2,546	23,663
Weighted-average Class C capital stock restricted stock units outstanding	303	7,623
Class A common stock issuable upon conversion of the convertible notes maturing in 2020	—	407
Class C capital stock issuable upon conversion of the 2023 Notes, 2024 Notes, 2025 Notes and 2026 Notes	39,834	—
Total Class A common stock and Class C capital stock equivalents	42,683	31,693

Note 16. Commitments and Contingencies

Interest Rate Lock Commitments

We have entered into IRLCs with prospective borrowers under our mortgage origination business whereby we commit to lend a certain loan amount under specific terms and at a specific interest rate to the borrower. These commitments are treated as derivatives and are carried at fair value. For additional information regarding our IRLCs, see Note 3 of our Notes to Condensed Consolidated Financial Statements of this Quarterly Report on Form 10-Q.

Lease Commitments

We have entered into various non-cancelable operating lease agreements for certain of our office space and equipment with original lease periods expiring between 2021 and 2030. For additional information regarding our lease agreements, see Note 13 in the Notes to the Consolidated Financial Statements in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

Purchase Commitments

Purchase commitments primarily include various non-cancelable agreements to purchase content related to our mobile applications and websites and certain cloud computing services as well as homes we are under contract to purchase through Zillow Offers but that have not closed as of the respective date. As of March 31, 2021, the value of homes under contract that have not closed was $511.3 million.

Letters of Credit

As of March 31, 2021, we have outstanding letters of credit of approximately $16.9 million, which secure our lease obligations in connection with certain of our office space operating leases.

Surety Bonds

In the course of business, we are required to provide financial commitments in the form of surety bonds to third parties as a guarantee of our performance on and our compliance with certain obligations. If we were to fail to perform or comply with these obligations, any draws upon surety bonds issued on our behalf would then trigger our payment obligation to the surety bond issuer. We have outstanding surety bonds issued for our benefit of approximately $10.4 million and $10.1 million, respectively, as of March 31, 2021 and December 31, 2020.

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Legal Proceedings

We are involved in a number of legal proceedings concerning matters arising in connection with the conduct of our business activities, some of which are at preliminary stages and some of which seek an indeterminate amount of damages. We regularly evaluate the status of legal proceedings in which we are involved to assess whether a loss is probable or there is a reasonable possibility that a loss or additional loss may have been incurred to determine if accruals are appropriate. We further evaluate each legal proceeding to assess whether an estimate of possible loss or range of loss can be made if accruals are not appropriate. For certain cases described below, management is unable to provide a meaningful estimate of the possible loss or range of possible loss because, among other reasons, (i) the proceedings are in preliminary stages; (ii) specific damages have not been sought; (iii) damages sought are, in our view, unsupported and/or exaggerated; (iv) there is uncertainty as to the outcome of pending appeals or motions; (v) there are significant factual issues to be resolved; and/or (vi) there are novel legal issues or unsettled legal theories presented. For these cases, however, management does not believe, based on currently available information, that the outcomes of these proceedings will have a material effect on our financial position, results of operations or cash flow. For the matters discussed below, we have not recorded any material accruals as of March 31, 2021 or December 31, 2020.

In July 2015, VHT, Inc. (“VHT”) filed a complaint against us in the U.S. District Court for the Western District of Washington alleging copyright infringement of VHT’s images on the Zillow Digs site. In January 2016, VHT filed an amended complaint alleging copyright infringement of VHT’s images on the Zillow Digs site as well as the Zillow listing site. In December 2016, the court granted a motion for partial summary judgment that dismissed VHT’s claims with respect to the Zillow listing site. On February 9, 2017, a jury trial returned a verdict finding that the Company had infringed VHT’s copyrights in images displayed or saved to the Digs site. The jury awarded VHT $79,875 in actual damages and approximately $8.2 million in statutory damages. On June 20, 2017, the District Court granted certain of our post-trial motions, finding that VHT failed to present sufficient evidence to prove direct copyright infringement for a portion of the images, reducing the total damages to approximately $4.1 million. On March 15, 2019, after we filed an appeal with the Ninth Circuit Court of Appeals seeking review of the final judgment and certain prior rulings entered by the District Court, the Ninth Circuit Court of Appeals issued an opinion that, among other things, (i) affirmed the District Court’s grant of summary judgment in favor of Zillow on direct infringement of images on Zillow’s listing site, (ii) affirmed the district court’s grant in favor of Zillow of judgment notwithstanding the verdict on certain images that were displayed on the Zillow Digs site, (iii) remanded consideration of the issue whether VHT’s images on the Zillow Digs site were part of a compilation or individual photos, and (iv) vacated the jury’s finding of willful infringement. On October 7, 2019, the U.S. Supreme Court denied VHT’s petition for writ of certiorari seeking review of certain rulings by the Ninth Circuit Court of Appeals. On December 6, 2019, the Company filed a motion for summary judgment with the District Court seeking a ruling that VHT’s images are a compilation, or in the alternative, seeking a dismissal of the case based on a recent U.S. Supreme Court ruling. On May 8, 2020, the District Court denied the Company’s motion for summary judgment and granted VHT’s motion for summary judgment on the issue of whether the remaining photos were a compilation. On March 10, 2021, the District Court ordered a new trial relating to 2,700 images that the jury previously found that the Company had willfully infringed, and for which the court did not enter judgment, on the question of (i) whether the Company’s infringement was innocent, and (2) statutory damages. A trial date has been scheduled during the third quarter of 2021. We do not believe there is a reasonable possibility that a material loss will be incurred related to this lawsuit.

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In August and September 2017, two purported class action lawsuits were filed against us and certain of our executive officers, alleging, among other things, violations of federal securities laws on behalf of a class of those who purchased our common stock between February 12, 2016 and August 8, 2017. One of those purported class actions, captioned Vargosko v. Zillow Group, Inc. et al, was brought in the U.S. District Court for the Central District of California. The other purported class action lawsuit, captioned Shotwell v. Zillow Group, Inc. et al, was brought in the U.S. District Court for the Western District of Washington. The complaints allege, among other things, that during the period between February 12, 2016 and August 8, 2017, we issued materially false and misleading statements regarding our business practices. The complaints seek to recover, among other things, alleged damages sustained by the purported class members as a result of the alleged misconduct. In November 2017, an amended complaint was filed against us and certain of our executive officers in the Shotwell v. Zillow Group purported class action lawsuit, extending the beginning of the class period to November 17, 2014. In January 2018, the Vargosko v. Zillow Group purported class action lawsuit was transferred to the U.S. District Court for the Western District of Washington and consolidated with the Shotwell v. Zillow Group purported class action lawsuit. In February 2018, the plaintiffs filed a consolidated amended complaint, and in April 2018, we filed our motion to dismiss the consolidated amended complaint. In October 2018, our motion to dismiss was granted without prejudice, and in November 2018, the plaintiffs filed a second consolidated amended complaint, which we moved to dismiss in December 2018. On April 19, 2019, our motion to dismiss the second consolidated amended complaint was denied, and we filed our answer to the second amended complaint on May 3, 2019. On October 11, 2019, plaintiffs filed a motion for class certification which was granted by the District Court on October 28, 2020. On February 17, 2021, the Ninth Circuit Court of Appeals denied our petition for review of that decision. We have denied the allegations of wrongdoing and intend to vigorously defend the claims in this lawsuit. We do not believe that there is a reasonable possibility that a material loss will be incurred related to this lawsuit.

In October and November 2017 and January and February 2018, four shareholder derivative lawsuits were filed in the U.S. District Court for the Western District of Washington and the Superior Court of the State of Washington, King County, against certain of our executive officers and directors seeking unspecified damages on behalf of the Company and certain other relief, such as reform to corporate governance practices. The plaintiffs in the derivative suits (in which the Company is a nominal defendant) allege, among other things, that the defendants breached their fiduciary duties in connection with oversight of the Company’s public statements and legal compliance, and as a result of the breach of such fiduciary duties, the Company was damaged, and defendants were unjustly enriched. Certain of the plaintiffs also allege, among other things, violations of Section 14(a) of the Securities Exchange Act of 1934 and waste of corporate assets. On February 5, 2018, the U.S. District Court for the Western District of Washington consolidated the two federal shareholder derivative lawsuits pending in that court. On February 16, 2018, the Superior Court of the State of Washington, King County, consolidated the two shareholder derivative lawsuits pending in that court. All four of the shareholder derivative lawsuits were stayed until our motion to dismiss the second consolidated amended complaint in the securities class action lawsuit discussed above was denied in April 2019. On July 8, 2019, the plaintiffs in the consolidated federal derivative lawsuit filed a consolidated shareholder derivative complaint, which we moved to dismiss on August 22, 2019. On February 28, 2020, our motion to dismiss the consolidated federal shareholder derivative complaint was denied. On May 18, 2020, we filed an answer in the consolidated federal derivative lawsuit. On August 24, 2020, we filed an answer in the consolidated state derivative matter. On February 16, 2021, the court in the consolidated state derivative matter stayed the action. On March 5, 2021, a new shareholder derivative lawsuit was filed in the U.S. District Court for the Western District of Washington against certain of our executive officers and directors seeking unspecified damages on behalf of the Company and certain other relief, such as reform to corporate governance practices, alleging, among other things, violations of federal securities laws. The defendants intend to deny the allegations of wrongdoing and vigorously defend the claims in this lawsuit. We do not believe that there is a reasonable possibility that a material loss will be incurred related to these derivative matters.

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On September 17, 2019, International Business Machines Corporation (“IBM”) filed a complaint against us in the U.S. District Court for the Central District of California, alleging, among other things, that the Company has infringed and continues to willfully infringe seven patents held by IBM and seeks unspecified damages, including a request that the amount of compensatory damages be trebled, injunctive relief and costs and reasonable attorneys’ fees. On November 8, 2019, we filed a motion to transfer venue and/or to dismiss the complaint. On December 2, 2019, IBM filed an amended complaint, and on December 16, 2019, we filed a renewed motion to transfer venue and/or to dismiss the complaint. The Company’s motion to transfer venue to the U.S. District Court for the Western District of Washington was granted on May 28, 2020. We filed our answer with counterclaims in response to the amended complaint on June 11, 2020. On July 2, 2020, IBM filed a motion to dismiss our counterclaims. In response to IBM’s motion, on July 22, 2020, we filed an amended answer with counterclaims. On August 12, 2020, IBM filed its answer to our counterclaims. On September 18, 2020, we filed four inter partes review (“IPR”) petitions before the U.S. Patent and Trial Appeal Board (“PTAB”) seeking the Board’s review of the patentability with respect to three of the patents asserted by IBM in the lawsuit. On March 15, 2021, the PTAB instituted inter partes review proceedings with respect to two of the three patents for which we filed petitions. On March 22, 2021, the PTAB denied institution with respect to the last of the three patents for which we filed an IPR. On April 21, 2021, we filed a request for rehearing of the PTAB decision denying institution. On January 22, 2021, the court partially stayed the action with respect to all patents for which we filed an IPR and set forth a motion schedule. On March 8, 2021, IBM filed its second amended complaint. On March 25, 2021, we filed an amended motion for judgment on the pleadings. We deny the allegations of any wrongdoing and intend to vigorously defend the claims in the lawsuit. There is a reasonable possibility that a loss may be incurred related to these IBM complaints; however, the possible loss or range of loss is not estimable.

On July 21, 2020, IBM filed a second action against us in the U.S. District Court for the Western District of Washington, alleging, among other things that the Company has infringed and continues to willfully infringe five patents held by IBM and seeks unspecified damages. On September 14, 2020, we filed a motion to dismiss the complaint filed in the action, to which IBM responded by the filing of an amended complaint on November 5, 2020. On December 18, 2020, we filed a motion to dismiss IBM’s first amended complaint. On December 23, 2020, the Court issued a written order staying this case in full. We deny the allegations of any wrongdoing and intend to vigorously defend the claims in the lawsuit. There is a reasonable possibility that a loss may be incurred related to these IBM complaints; however, the possible loss or range of loss is not estimable.

In addition to the matters discussed above, from time to time, we are involved in litigation and claims that arise in the ordinary course of business. Although we cannot be certain of the outcome of any such litigation or claims, nor the amount of damages and exposure that we could incur, we currently believe that the final disposition of such matters will not have a material effect on our business, financial position, results of operations or cash flow. Regardless of the outcome, litigation can have an adverse impact on us because of defense and settlement costs, diversion of management resources and other factors.

Indemnifications

In the ordinary course of business, we enter into contractual arrangements under which we agree to provide indemnification of varying scope and terms to business partners and other parties with respect to certain matters, including, but not limited to, losses arising out of the breach of such agreements and out of intellectual property infringement claims made by third parties. In addition, we have agreements that indemnify certain issuers of surety bonds against losses that they may incur as a result of executing surety bonds on our behalf. For our indemnification arrangements, payment may be conditional on the other party making a claim pursuant to the procedures specified in the particular contract. Further, our obligations under these agreements may be limited in terms of time and/or amount, and in some instances, we may have recourse against third parties for certain payments. In addition, we have indemnification agreements with certain of our directors and executive officers that require us, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers. The terms of such obligations may vary.

Note 17. Employee Benefit Plan

We have a defined contribution 401(k) retirement plan covering Zillow Group employees who have met certain eligibility requirements (the “Zillow Group 401(k) Plan”). Eligible employees may contribute pretax compensation up to a maximum amount allowable under the Internal Revenue Service limitations. Employee contributions and earnings thereon vest immediately. We currently match up to 4% of employee contributions under the Zillow Group 401(k) Plan. The total expense related to the Zillow Group 401(k) Plan was $7.7 million and $6.4 million, respectively, for the three months ended March 31, 2021 and 2020.

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Note 18. Segment Information and Revenue

We have three operating and reportable segments, which have been identified based on the way in which our chief operating decision-maker manages our business, makes operating decisions and evaluates operating performance. The chief executive officer acts as the chief operating decision-maker and reviews financial and operational information for the Homes, Internet, Media & Technology (“IMT”) and Mortgages segments.

The Homes segment includes the financial results from Zillow Group’s purchase and sale of homes directly through Zillow Offers and the financial results from title and escrow services through Zillow Closing Services. The IMT segment includes the financial results for the Premier Agent, rentals and new construction marketplaces, dotloop and display, as well as revenue from the sale of various other marketing and business products and services to real estate professionals. The Mortgages segment primarily includes financial results for mortgage originations and the sale of mortgages on the secondary market through Zillow Home Loans and advertising sold to mortgage lenders and other mortgage professionals.

Revenue and costs are directly attributed to our segments when possible. However, due to the integrated structure of our business, certain costs incurred by one segment may benefit the other segments. These costs primarily include headcount-related expenses, general and administrative expenses including executive, finance, accounting, legal, human resources, recruiting and facilities costs, product development and data acquisition costs, costs related to operating our mobile applications and websites, and marketing and advertising costs. These costs are allocated to each segment based on the estimated benefit each segment receives from such expenditures.

The chief executive officer reviews information about our revenue categories as well as statement of operations data inclusive of income (loss) before income taxes by segment. This information is included in the following table for the periods presented (in thousands):

	Three Months Ended March 31, 2021						Three Months Ended March 31, 2020
	Homes		IMT		Mortgages		Homes		IMT		Mortgages
Revenue:
Zillow Offers	$	700,974	$	—	$	—	$	769,112	$	—	$	—
Premier Agent	—		334,318		—		—		242,106		—
Other	3,178		112,010		—		761		88,560		—
Mortgages	—		—		67,960		—		—		25,282
Total revenue	704,152		446,328		67,960		769,873		330,666		25,282
Costs and expenses:
Cost of revenue	640,618		28,016		18,396		732,199		24,318		5,155
Sales and marketing	55,025		113,298		25,270		71,589		120,173		12,886
Technology and development	37,139		101,893		9,824		32,538		95,028		7,352
General and administrative	25,532		58,729		16,290		23,421		58,754		10,110
Impairment costs	—		—		—		—		73,900		2,900
Acquisition-related costs	—		817		—		—		—		—
Total costs and expenses (1)	758,314		302,753		69,780		859,747		372,173		38,403
Income (loss) from operations	(54,162)		143,575		(1,820)		(89,874)		(41,507)		(13,121)
Segment other income	—		—		1,732		—		—		202
Segment interest expense	(4,312)		—		(1,732)		(8,084)		—		(226)
Income (loss) before income taxes (2)	$	(58,474)	$	143,575	$	(1,820)	$	(97,958)	$	(41,507)	$	(13,145)

(1) The following table presents depreciation and amortization expense and share-based compensation expense for each of our segments for the periods presented (in thousands):

	Three Months Ended March 31, 2021						Three Months Ended March 31, 2020
	Homes		IMT		Mortgages		Homes		IMT		Mortgages
Depreciation and amortization expense	$	4,293	$	22,799	$	1,807	$	3,575	$	23,777	$	1,674
Share-based compensation expense	$	15,921	$	41,392	$	6,360	$	11,304	$	29,547	$	2,944

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(2) The following table presents the reconciliation of total segment income (loss) before income taxes to consolidated income (loss) before income taxes for the periods presented (in thousands):

	Three Months Ended March 31,
	2021		2020
Total segment income (loss) before income taxes	$	83,281	$	(152,610)
Corporate interest expense	(33,511)		(29,282)
Corporate other income	707		9,391
Loss on extinguishment of debt	(1,403)		—
Consolidated income (loss) before income taxes	$	49,074	$	(172,501)

Certain corporate items are not directly attributable to any of our segments, including the loss on extinguishment of debt, interest income earned on our short-term investments included in other income and interest costs on our convertible senior notes included in interest expense.

Note 19. Subsequent Events

Acquisition of ShowingTime.com, Inc.

As previously disclosed, in February 2021, we entered into a definitive agreement to acquire ShowingTime.com, Inc. (“ShowingTime”), a real estate showing software provider, for $500.0 million in cash, subject to certain adjustments, payable upon the closing of the acquisition. On April 19, 2021, each of Zillow Group and ShowingTime received a request from the U.S. Federal Trade Commission (the “FTC”) for additional information and documentary material (commonly referred to as a “Second Request”) pursuant to the Hart-Scott-Rodino Antitrust Improvements Act of 1976 (the “HSR Act”) in connection with our proposed acquisition of ShowingTime. The FTC’s Second Request extends the waiting period imposed under the HSR Act until 30 days after both Zillow Group and ShowingTime have substantially complied with the Second Request, unless the waiting period is terminated earlier by the FTC or voluntarily extended through an agreement among Zillow Group, ShowingTime and the FTC. We continue to cooperate with the FTC in its review of the proposed acquisition.

Amendment of Credit Facility Agreements

On April 7, 2021, certain wholly owned subsidiaries of Zillow Group amended and restated the credit agreement with Credit Suisse AG, Cayman Islands, in order to facilitate a titling trust structure. The credit facility will continue to be classified within current liabilities in our condensed consolidated balance sheets.

On April 14, 2021, certain wholly owned subsidiaries of Zillow Group amended and restated the credit agreement with Goldman Sachs Bank USA previously maturing on April 20, 2022 in order to facilitate a titling trust structure and extend the maturity date to October 21, 2022. The credit facility will continue to be classified within current liabilities in our condensed consolidated balance sheets.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion of our financial condition and results of operations should be read in conjunction with our condensed consolidated financial statements and the related notes included elsewhere in this Quarterly Report on Form 10-Q. In addition to historical financial information, the following discussion contains forward-looking statements that reflect our plans, estimates and beliefs. Our actual results may differ materially from those described in or implied by any forward-looking statements. Factors that could cause or contribute to these differences include those discussed below and elsewhere in this Quarterly Report on Form 10-Q, including in the section titled “Note Regarding Forward-Looking Statements,” and also those factors discussed in Part I, Item 1A (Risk Factors) of our Annual Report on Form 10-K for the year ended December 31, 2020.

Overview of our Business

Zillow Group, Inc. is reimagining real estate to make it easier to unlock life’s next chapter. As the most visited real estate website in the United States, Zillow and its affiliates offer customers an on-demand experience for selling, buying, renting or financing with transparency and nearly seamless end-to-end service. Zillow Offers buys and sells homes directly in dozens of markets across the country, allowing sellers control over their timeline. Zillow Home Loans, our affiliate lender, provides our customers with an easy option to get pre-approved and secure financing for their next home purchase. In September 2020, Zillow launched Zillow Homes, Inc., a licensed brokerage entity, to streamline Zillow Offers transactions.

Other consumer brands include Trulia, StreetEasy, HotPads and Out East. In addition, Zillow Group provides a comprehensive suite of marketing software and technology solutions which include Mortech, dotloop, Bridge Interactive and New Home Feed.

Reportable Segments and Revenue Overview

Zillow Group has three reportable segments: the Homes segment, the Internet, Media & Technology (“IMT”) segment and the Mortgages segment. The Homes segment includes the financial results from Zillow Group’s purchase and sale of homes directly through the Zillow Offers service and the financial results from the title and escrow services provided through Zillow Closing Services. The IMT segment includes the financial results for the Premier Agent, rentals and new construction marketplaces, as well as dotloop, display and other advertising and business software solutions. The Mortgages segment primarily includes financial results for mortgage originations through Zillow Home Loans and advertising sold to mortgage lenders and other mortgage professionals.

The Homes segment primarily generates revenue through our Zillow Offers service from the resale of homes. Other Homes revenue relates to revenue associated with title and escrow services provided through Zillow Closing Services.

Premier Agent revenue is generated by the sale of advertising services, as well as marketing and technology products and services, to help real estate agents and brokers grow and manage their businesses. We offer these products and services through our Premier Agent and Premier Broker programs. Premier Agent and Premier Broker advertising products, which include the delivery of impressions and validated consumer connections, or leads, are primarily offered on a share of voice basis. Impressions and leads are distributed to Premier Agents and Premier Brokers in proportion to their share of voice, or an agent advertiser’s share of total advertising purchased in a particular zip code. Impressions are delivered when an advertisement of a Premier Agent or Premier Broker appears on pages viewed by users of our mobile applications and websites and connections are delivered when consumer contact information is provided to Premier Agents and Premier Brokers. Connections and impressions are each provided as part of our advertising services for Premier Agent and Premier Brokers; we do not charge a separate fee for these consumer leads.

We also offer a pay for performance pricing model called “Flex” for Premier Agent and Premier Broker advertising services in limited markets. We offer this pricing model to select partners and provide it alongside our legacy market-based pricing model. With the Flex model, Premier Agents and Premier Brokers are provided with validated leads at no upfront cost and pay a performance advertising fee only when a real estate transaction is closed with one of the leads.

Other IMT revenue includes revenue generated by rentals, new construction and display advertising, as well as revenue from the sale of various other advertising and business technology solutions for real estate professionals, including dotloop. Rentals revenue includes advertising sold to property managers, landlords and other rental professionals on a cost per lead, cost per click, cost per lease, cost per listing or cost per impression basis. Rentals revenue also includes revenue generated from our rental applications product, through which potential renters can submit applications to multiple properties for a flat service fee. New construction revenue primarily includes advertising services sold to home builders on a cost per residential community or cost per impression basis. Display revenue consists of graphical mobile and web advertising sold on a cost per impression or cost per click basis to advertisers promoting their brands on our mobile applications and websites.

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In our Mortgages segment, we primarily generate revenue through mortgage originations and the related sale of mortgages on the secondary market through Zillow Home Loans and from advertising sold to mortgage lenders and other mortgage professionals on a cost per lead basis, including our Custom Quote and Connect services.

As of March 31, 2021, we had 5,868 full-time employees compared to 5,504 full-time employees as of December 31, 2020.

Financial Highlights

During the three months ended March 31, 2021, and 2020, we generated total revenue of $1.2 billion and $1.1 billion, respectively, representing year-over-year growth of 8%. The increase in total revenue was primarily attributable to:

•Premier Agent revenue increased by $92.2 million to $334.3 million for the three months ended March 31, 2021 compared to $242.1 million for the three months ended March 31, 2020.

•Other IMT revenue increased by $23.5 million to $112.0 million for the year ended March 31, 2021 compared to $88.6 million for the three months ended March 31, 2020, primarily due to a 46% increase in rentals revenue.

•Mortgages segment revenue increased by $42.7 million to $68.0 million for the three months ended March 31, 2021 compared to $25.3 million for the three months ended March 31, 2020, primarily due to an increase in revenue generated by Zillow Home Loans.

•Zillow Offers revenue decreased by $68.1 million to $701.0 million for the three months ended March 31, 2021 due to the sale of 1,965 homes at an average selling price of $356.7 thousand per home. For the three months ended March 31, 2020, Zillow Offers revenue was $769.1 million due to the sale of 2,394 homes at an average selling price of $321.3 thousand per home. As of March 31, 2021, Zillow Offers was operating in 25 metropolitan areas.

•Visits for the three months ended March 31, 2021 and 2020 were 2,511.2 million and 2,117.6 million, respectively, representing year-over-year growth of 19%. The increase in visits increased the number of events we monetized across our revenue categories.

•Average monthly unique users of our mobile applications and websites for the three months ended March 31, 2021 and 2020 were 220.5 million and 192.5 million, respectively, representing year-over-year growth of 15%.

COVID-19 Impact

In December 2019, COVID-19 was reported and subsequently spread worldwide. On March 11, 2020, the World Health Organization declared COVID-19 a pandemic. The COVID-19 pandemic and resulting global and economic disruptions have affected our business, as well as those of our customers and real estate partners. In response to the COVID-19 pandemic, we have taken certain measures intended to serve the needs of our customers and real estate partners, while also protecting our business and the safety of our employees, our customers and the communities in which we operate.

We have taken meaningful actions to support our customers and partners throughout the pandemic. In 2020, we implemented a variety of relief initiatives to help them navigate their financial challenges. This included discounts provided to our Premier Agent advertisers and on certain of our other IMT and Mortgage marketplace products. In addition, we temporarily paused home buying in early 2020 in all markets in response to local public health orders and to help protect the safety and health of our employees, customers and partners. By early August 2020, we had resumed home buying in all paused Zillow Offers markets with enhanced health and safety protocols and increased usage of virtual technology. For more details on these initiatives, see Part II Item 7 (Management’s Discussion and Analysis of Financial Condition and Results of Operations) of our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

We have also taken action to promote the health and safety of our employees during the COVID-19 pandemic and we quickly transitioned the majority of our employees to work remotely and announced that most employees will have flexibility to work from home indefinitely. We have started re-opening our offices to employees on an as-needed basis and will begin welcoming employees to use certain office locations more widely in September 2021. We believe our offices will continue to provide our distributed workforce with a place to work, learn and collaborate in the future.

To preserve our liquidity in response to the COVID-19 pandemic, we temporarily paused hiring for non-critical roles, paused the majority of our advertising spending and reduced other discretionary spending during the first half of 2020. As our financial position has strengthened, we have gradually increased our hiring and marketing and advertising activities, and on March 11, 2021, we announced our plan to hire more than 2,000 employees nationwide in 2021.

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Our liquidity has also been positively impacted by certain provisions included in the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) that was signed into law on March 27, 2020 and provides tax provisions and other stimulus measures to affected companies. Under the CARES Act, we are able to defer certain 2020 employer payroll tax payments until the fourth quarter of 2021 and 2022.

The effect and extent of the impact of the COVID-19 pandemic on our business continues to be uncertain and difficult to predict. While we have seen recovery in our business and the business of our customers and real estate partners from the initial economic effects of the pandemic, the impact of the COVID-19 pandemic may continue to affect our financial results in 2021. The extent to which COVID-19 continues to impact our results and financial position will depend on future developments, which are uncertain and difficult to predict, including new information that may emerge concerning the severity of the COVID-19 pandemic, actions taken to contain it or address its impact and the availability and widespread distribution and use of effective vaccines.

Key Metrics

Management has identified visits, unique users, the number of homes sold through Zillow Offers and the volume of loans originated through Zillow Home Loans as relevant to investors’ and others’ assessment of our financial condition and results of operations. Both visits and unique users increased for the three months ended March 31, 2021 as compared to the three months ended March 31, 2020, reflecting the continued stabilization of the real estate market and our business. However, as the COVID-19 pandemic is ongoing, it may adversely impact the number of visits and unique users to our mobile applications and websites in the future.

Visits

The number of visits is an important metric because it is an indicator of consumers’ level of engagement with our mobile applications, websites and other services. We believe highly engaged consumers are more likely to participate in our Zillow Offers program, use Zillow Homes Loans or be transaction-ready real estate market participants and therefore are more sought-after by our Premier Agent and Premier Broker real estate partners.

We define a visit as a group of interactions by users with the Zillow, Trulia and StreetEasy mobile applications and websites. A single visit can contain multiple page views and actions, and a single user can open multiple visits across domains, web browsers, desktop or mobile devices. Visits can occur on the same day, or over several days, weeks or months.

Zillow and StreetEasy measure visits with Google Analytics, and Trulia measures visits with Adobe Analytics. Visits to Trulia end after thirty minutes of user inactivity. Visits to Zillow and StreetEasy end either: (i) after thirty minutes of user inactivity or at midnight; or (ii) through a campaign change. A visit ends through a campaign change if a visitor arrives via one campaign or source (for example, via a search engine or referring link on a third-party website), leaves the mobile application or website, and then returns via another campaign or source.

The following table presents the number of visits to our mobile applications and websites for the periods presented (in millions):

	Three Months Ended March 31,		2020 to 2021 % Change
	2021	2020
Visits	2,511.2	2,117.6	19	%

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Unique Users

Measuring unique users is important to us because much of our revenue depends in part on our ability to connect home buyers and sellers, renters and individuals with or looking for a mortgage to real estate, rental and mortgage professionals, products and services. Growth in consumer traffic to our mobile applications and websites increases the number of impressions, clicks, connections, leads and other events we can monetize to generate revenue. For example, our Homes segment and Mortgages segment revenue depend in part on users accessing our mobile applications and websites to engage in the sale, purchase and financing of homes with Zillow Offers and Zillow Home Loans, and our Premier Agent revenue and display revenue depend on advertisements being served to users of our mobile applications and websites.

We count a unique user the first time an individual accesses one of our mobile applications using a mobile device during a calendar month and the first time an individual accesses one of our websites using a web browser during a calendar month. If an individual accesses our mobile applications using different mobile devices within a given month, the first instance of access by each such mobile device is counted as a separate unique user. If an individual accesses more than one of our mobile applications within a given month, the first access to each mobile application is counted as a separate unique user. If an individual accesses our websites using different web browsers within a given month, the first access by each such web browser is counted as a separate unique user. If an individual accesses more than one of our websites in a single month, the first access to each website is counted as a separate unique user since unique users are tracked separately for each domain. Zillow, StreetEasy and HotPads measure unique users with Google Analytics, and Trulia measures unique users with Adobe Analytics.

Due to third-party technological limitations, user software settings, or user behavior, Google Analytics may assign a unique cookie to different instances of access by the same individual to our mobile applications and websites. In such instances, Google Analytics would count different instances of access by the same individual as separate unique users. Accordingly, reliance on the number of unique users counted by Google Analytics may overstate the actual number of unique users who access our mobile applications and websites during the period.

The following table presents our average monthly unique users for the periods presented (in millions):

	Three Months Ended March 31,		2020 to 2021 % Change
	2021	2020
Average monthly unique users	220.5	192.5	15	%

Homes Sold

The number of homes sold through Zillow Offers is an important metric as it is an indicator of customers’ adoption of the Zillow Offers service as well as our ability to generate revenue through the service. Growth in the number of homes sold through Zillow Offers suggests increased adoption of the service by home buyers and generally results in growth in Homes segment revenue.

The following table presents the number of homes sold through Zillow Offers for the periods presented:

	Three Months Ended March 31,		2020 to 2021 % Change
	2021	2020
Number of homes sold	1,965	2,394	(18)	%

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Loan Origination Volume

Loan origination volume is an important metric as it is a measure of how successful we are at growing originations and subsequent sales of mortgage loan products through our mortgage origination business, Zillow Home Loans, which directly impacts our Mortgages segment revenue. Loan origination volume represents the total value of mortgage loan originations closed through Zillow Home Loans during the period.

The following table presents loan origination volume by purpose and in total for Zillow Home Loans for the periods presented (in thousands):

	Three Months Ended March 31,				2020 to 2021 % Change
	2021		2020
Purchase loan origination volume	$	115,238	$	112,221	3	%
Refinance loan origination volume	1,051,807		24,809		4,140	%
Total loan origination volume	$	1,167,045	$	137,030	752	%

As we began presenting loan origination volume by purpose and in total for the three months ended March 31, 2021, the following table sets forth select historical loan origination data for each of the periods presented (in thousands):

	Three Months Ended
	December 31, 2020		September 30, 2020		June 30, 2020
Purchase loan origination volume	$	143,549	$	163,728	$	120,831
Refinance loan origination volume	687,104		353,360		147,475
Total loan origination volume	$	830,653	$	517,088	$	268,306

Results of Operations

Given the remaining uncertainty surrounding the COVID-19 pandemic, financial performance for prior and current periods may not be indicative of future performance.

Revenue

									% of Total Revenue
	Three Months Ended March 31,				2020 to 2021				Three Months Ended March 31,
	2021		2020		$ Change		% Change		2021		2020
	(in thousands, unaudited)
Revenue:
Homes segment:
Zillow Offers	$	700,974	$	769,112	$	(68,138)	(9)	%	58	%	68	%
Other	3,178		761		2,417		318		—		—
Total Homes segment revenue	704,152		769,873		(65,721)		(9)		58		68
IMT segment:
Premier Agent	334,318		242,106		92,212		38		27		22
Other	112,010		88,560		23,450		26		9		8
Total IMT segment revenue	446,328		330,666		115,662		35		37		29
Mortgages segment	67,960		25,282		42,678		169		6		2
Total revenue	$	1,218,440	$	1,125,821	$	92,619	8	%	100	%	100	%

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Total revenue increased $92.6 million, or 8%, to $1,218.4 million:

•IMT segment revenue increased 35% to $446.3 million due to a $92.2 million, or 38%, increase in Premier Agent revenue and a $23.5 million, or 26%, increase in Other IMT revenue. Premier Agent revenue was positively impacted by an increase in visits, which increased 19% to 2,511.2 million. Premier Agent revenue per visit increased by 16% to $0.133 for the three months ended March 31, 2021 from $0.114 for the three months ended March 31, 2020. We calculate Premier Agent revenue per visit by dividing the revenue generated by our Premier Agent and Premier Broker programs by the number of visits in the period. The increase in Premier Agent revenue per visit was driven primarily by continued strong demand across the residential real estate industry and increased consumer engagement across our mobile applications and websites. Additionally, in response to the COVID-19 pandemic, effective March 23, 2020 we offered Premier Agent advertisers who participated in our market-based pricing program a 50% discount on their next monthly bill. These discounts had the impact of decreasing Premier Agent revenue per visit for the three months ended March 31, 2020. Other IMT revenue increased primarily due to a 46% increase in revenue generated by our rentals marketplace. This was attributable to increased revenue from our pay per listing, pay per contact and rental applications products. We expect IMT segment revenue to increase in absolute dollars in future periods as a result of the expected continued expansion of our Flex pricing model and rentals products.

•Mortgages segment revenue increased 169% to $68.0 million primarily due to growth in mortgage originations revenue which drove 82% of the increase in Mortgages segment revenue, while growth in our Custom Quote and Connect advertising services revenue accounted for 18% of the increase in Mortgages segment revenue. The increase in mortgage originations revenue was primarily driven by an increase in loan origination volume from $137.0 million to $1.2 billion, or 752%, as well as a 6% increase in gain on sale margin. We believe low interest rates have supported strong refinance activity during the three months ended March 31, 2021. In the event interest rates increase in future periods, refinance activity may decrease as a percentage of total loan origination volume which may result in a decrease in absolute dollars in mortgage segment revenue in future periods. Gain on sale margin represents the net gain on sale of mortgage loans divided by total loan origination volume for the period. Net gain on sale of mortgage loans includes all components related to the origination and sale of mortgage loans, including the net gain on sale of loans into the secondary market, loan origination fees, unrealized gains and losses associated with changes in fair value of interest rate lock commitments and mortgage loans held for sale, realized and unrealized gains or losses from derivative financial instruments, and the provision for losses relating to representations and warranties. The increase in our Custom Quote and Connect advertising revenue was primarily due to a 46% increase in leads generated from marketing products sold to mortgage professionals.

•Homes segment revenue decreased 9% to $704.2 million, primarily due to a decrease of $68.1 million, or 9%, in Zillow Offers revenue. Zillow Offers revenue declined to $701.0 million due to the sale of 1,965 homes at an average selling price of $356.7 thousand per home, as compared to the sale of 2,394 homes at an average selling price of $321.3 thousand per home in the comparable prior year period. While we have resumed home buying in all Zillow Offers markets following our temporary pause in the first half of 2020, we are continuing to rebuild our inventory available for resale. We expect Zillow Offers revenue to increase in future periods as we expect to continue to increase our home buying and home selling activities across all markets.

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Income (Loss) Before Income Taxes

									% of Revenue
	Three Months Ended March 31,				2020 to 2021				Three Months Ended March 31,
	2021		2020		$ Change		% Change		2021		2020
	(in thousands, unaudited)
Income (loss) before income taxes:
Homes segment	$	(58,474)	$	(97,958)	$	39,484	40	%	(8)	%	(13)	%
IMT segment	143,575		(41,507)		185,082		446		32		(13)
Mortgages segment	(1,820)		(13,145)		11,325		86		(3)		(52)
Corporate items (1)	(34,207)		(19,891)		(14,316)		(72)		N/A		N/A
Total income (loss) before income taxes	$	49,074	$	(172,501)	$	221,575	128	%	4	%	(15)	%

(1) Certain corporate items are not directly attributable to any of our segments, including the loss on extinguishment of debt, interest income earned on our short-term investments included in other income and interest costs on our convertible senior notes included in interest expense.

Income (loss) before income taxes increased by $221.6 million, or 128%, to income of $49.1 million, driven by:

•An increase in IMT segment income before income taxes of $185.1 million, or 446%, primarily due to an increase in IMT segment revenue of $115.7 million, as discussed above, and a decrease in impairment costs of $73.9 million, due to $68.6 million of the $71.5 million non-cash impairment recorded to the IMT segment related to the Trulia trade names and trademarks intangible asset and the $5.3 million non-cash impairment related to our October 2016 equity investment recognized during the three months ended March 31, 2020. The increase in IMT segment income before income taxes was also attributable to a decrease in data acquisition costs of $8.6 million and a decrease in marketing and advertising expenses of $8.4 million, partially offset by an increase in headcount-related expenses of $29.5 million, as discussed further below under the “Costs and Expenses and Other Items” subsection.

•A decrease in Homes segment loss before income taxes of $39.5 million, or 40%, resulting from a decrease of $101.4 million in Homes segment costs and expenses and a decrease of $3.8 million in interest expense, partially offset by a decrease of $65.7 million in Homes segment revenue. The decreases in these items was driven by the sale of 429 fewer homes during the three months ended March 31, 2021 compared to the three months ended March 31, 2020, as described above.

•A decrease in Mortgages segment loss before income taxes of $11.3 million, or 86%, primarily due to an increase in Mortgages segment revenue of $42.7 million driven by higher loan origination volume within our Zillow Home Loans business, as discussed above. This was partially offset by an increase in Mortgages segment costs and expenses of $31.4 million, driven primarily by increased headcount-related costs to support the growth in our Zillow Home Loans business.

•An increase in loss before income taxes for corporate items of $14.3 million to a loss of $34.2 million, primarily due to a decrease in other income of $8.7 million as a result of rebalancing of our investment portfolio to lower risk investments with generally lower yields in light of the COVID-19 pandemic, a $4.2 million increase in interest expense primarily associated with the May 2020 issuance of the convertible senior notes due in 2025, which was partially offset by the impact of the settlement of the convertible senior notes due in 2020 and 2021 during the three months ended December 31, 2020, and a $1.4 million increase in the loss on extinguishment of debt due to conversions of the convertible senior notes maturing in 2023, 2024 and 2026 which occurred during the three months ended March 31, 2021.

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Adjusted EBITDA

									% of Revenue
	Three Months Ended March 31,				2020 to 2021				Three Months Ended March 31,
	2021		2020		$ Change		% Change		2021		2020
	(in thousands, unaudited)
Net income (loss)	$	51,964	$	(163,273)	$	215,237	132	%	4	%	(15)	%
Adjusted EBITDA:
Homes segment	$	(33,948)	$	(74,995)	$	41,047	55	%	(5)	%	(10)	%
IMT segment	208,583		85,717		122,866		143		47		26
Mortgages segment	6,347		(5,603)		11,950		213		9		(22)
Total Adjusted EBITDA	$	180,982	$	5,119	$	175,863	3435	%	15	%	—	%

To provide investors with additional information regarding our financial results, we have disclosed Adjusted EBITDA in total and for each segment, each a non-GAAP financial measure, within this Quarterly Report on Form 10-Q. We have provided a reconciliation below of Adjusted EBITDA in total to net income (loss) and Adjusted EBITDA by segment to income (loss) before income taxes for each segment, the most directly comparable GAAP financial measures.

We have included Adjusted EBITDA in total and for each segment in this Quarterly Report on Form 10-Q as they are key metrics used by our management and board of directors to measure operating performance and trends and to prepare and approve our annual budget. In particular, the exclusion of certain expenses in calculating Adjusted EBITDA facilitates operating performance comparisons on a period-to-period basis.

Our use of Adjusted EBITDA in total and for each segment has limitations as an analytical tool, and you should not consider these measures in isolation or as a substitute for analysis of our results as reported under GAAP. Some of these limitations are:

•Adjusted EBITDA does not reflect our cash expenditures or future requirements for capital expenditures or contractual commitments;

•Adjusted EBITDA does not reflect changes in, or cash requirements for, our working capital needs;

•Adjusted EBITDA does not consider the potentially dilutive impact of share-based compensation;

•Although depreciation and amortization are non-cash charges, the assets being depreciated and amortized may have to be replaced in the future, and Adjusted EBITDA does not reflect cash capital expenditure requirements for such replacements or for new capital expenditure requirements;

•Adjusted EBITDA does not reflect impairment costs;

•Adjusted EBITDA does not reflect acquisition-related costs;

•Adjusted EBITDA does not reflect the loss on extinguishment of debt;

•Adjusted EBITDA does not reflect interest expense or other income;

•Adjusted EBITDA does not reflect income taxes; and

•Other companies, including companies in our own industry, may calculate Adjusted EBITDA differently than we do, limiting its usefulness as a comparative measure.

Because of these limitations, you should consider Adjusted EBITDA in total and for each segment alongside other financial performance measures, including various cash flow metrics, net income (loss), income (loss) before income taxes for each segment and our other GAAP results.

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The following tables present a reconciliation of Adjusted EBITDA to the most directly comparable GAAP financial measure, which is net income (loss) on a consolidated basis and income (loss) before income taxes for each segment, for each of the periods presented (in thousands, unaudited):

	Three Months Ended March 31, 2021
	Homes		IMT		Mortgages		Corporate Items (2)		Consolidated
Reconciliation of Adjusted EBITDA to Net Income and Income (Loss) Before Income Taxes:
Net income (1)	N/A		N/A		N/A		N/A		$	51,964
Income tax benefit	N/A		N/A		N/A		N/A		(2,890)
Income (loss) before income taxes	$	(58,474)	$	143,575	$	(1,820)	$	(34,207)	$	49,074
Other income	—		—		(1,732)		(707)		(2,439)
Depreciation and amortization expense	4,293		22,799		1,807		—		28,899
Share-based compensation expense	15,921		41,392		6,360		—		63,673
Acquisition-related costs	—		817		—		—		817
Loss on extinguishment of debt	—		—		—		1,403		1,403
Interest expense	4,312		—		1,732		33,511		39,555
Adjusted EBITDA	$	(33,948)	$	208,583	$	6,347	$	—	$	180,982

	Three Months Ended March 31, 2020
	Homes		IMT		Mortgages		Corporate Items (2)		Consolidated
Reconciliation of Adjusted EBITDA to Net Loss and Loss Before Income Taxes:
Net loss (1)	N/A		N/A		N/A		N/A		$	(163,273)
Income tax benefit	N/A		N/A		N/A		N/A		(9,228)
Loss before income taxes	$	(97,958)	$	(41,507)	$	(13,145)	$	(19,891)	$	(172,501)
Other income	—		—		(202)		(9,391)		(9,593)
Depreciation and amortization expense	3,575		23,777		1,674		—		29,026
Share-based compensation expense	11,304		29,547		2,944		—		43,795
Impairment costs	—		73,900		2,900		—		76,800
Interest expense	8,084		—		226		29,282		37,592
Adjusted EBITDA	$	(74,995)	$	85,717	$	(5,603)	$	—	$	5,119
(1) We use income (loss) before income taxes as our profitability measure in making operating decisions and assessing the performance of our segments, therefore, net income (loss) and income tax benefit are calculated and presented only on a consolidated basis within our financial statements.
(2) Certain corporate items are not directly attributable to any of our segments, including the loss on extinguishment of debt, interest income earned on our short-term investments included in other income and interest costs on our convertible senior notes included in interest expense.

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Costs and Expenses and Other Items

									% of Total Revenue
	Three Months Ended March 31,				2020 to 2021				Three Months Ended March 31,
	2021		2020		$ Change		% Change		2021		2020
	(in thousands, unaudited)
Cost of revenue (exclusive of amortization) (1)	$	687,030	$	761,672	$	(74,642)	(10)	%	56	%	68	%
Sales and marketing	193,593		204,648		(11,055)		(5)		16		18
Technology and development	148,856		134,918		13,938		10		12		12
General and administrative	100,551		92,285		8,266		9		8		8
Impairment costs	—		76,800		(76,800)		(100)		0		7
Acquisition-related costs	817		—		817		N/A		—		0
Total costs and expenses	1,130,847		1,270,323		(139,476)		(11)		93		113
Loss on extinguishment of debt	(1,403)		—		(1,403)		N/A		—		0
Other income	2,439		9,593		(7,154)		(75)		—		1
Interest expense	(39,555)		(37,592)		(1,963)		(5)		(3)		(3)
Income tax benefit	2,890		9,228		(6,338)		(69)		—		1

(1) Amortization of website development costs and intangible assets included in technology and development was $20.8 million and $17.2 million for the three months ended March 31, 2021 and 2020, respectively.

Cost of Revenue

Our cost of revenue consists of expenses related to operating our mobile applications and websites, including associated headcount expenses, such as salaries, benefits, bonuses and share-based compensation expense, as well as revenue-sharing costs related to our commercial business relationships, depreciation expense and costs associated with hosting our mobile applications and websites. For our Homes segment, our cost of revenue also consists of the consideration paid to acquire and make certain repairs and updates to each home, including associated overhead costs, as well as inventory valuation adjustments. For our IMT and Mortgages segments, cost of revenue also includes credit card fees and ad serving costs paid to third parties. For our Mortgages segment, our cost of revenue also consists of direct costs to originate loans, including underwriting and processing costs.

Cost of revenue decreased by $74.6 million, or 10%, due primarily to a decrease of $91.6 million in our Homes segment, partially offset by increases of $13.2 million and $3.7 million within the Mortgages and IMT segments, respectively.

The decrease in cost of revenue in our Homes segment was driven primarily by a decrease of $92.7 million in home acquisition and renovation costs due to the decrease in the number of homes sold from 2,394 during the three months ended March 31, 2020 to 1,965 during the three months ended March 31, 2021. See further discussion on the decrease in the number of homes sold under the “Revenue” subsection above. We expect cost of revenue for the Homes segment to increase in absolute dollars in future periods as we accelerate home buying and selling through our Zillow Offers business.

The increase in cost of revenue in the Mortgages segment was primarily attributable to an increase in headcount-related expenses of $5.7 million and an increase in lead acquisition costs of $4.7 million associated with growth in our Zillow Home Loans business, as discussed above. We expect cost of revenue for our Mortgages segment to increase in absolute dollars in future periods due to an increase in lead acquisition costs to support the growth of our Zillow Home Loans business.

We expect cost of revenue for our IMT segment to increase in absolute dollars in future periods to support the expected growth in revenue as discussed above.

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Sales and Marketing

Sales and marketing expenses consist of advertising costs and other sales expenses related to promotional and marketing activities, headcount expenses, including salaries, commissions, benefits, bonuses and share-based compensation expense for sales, sales support, customer support, including the customer connections team, marketing and public relations employees and depreciation expense. For our Homes segment, sales and marketing expenses also consist of selling costs, such as real estate agent commissions, escrow and title fees, and staging costs, as well as holding costs incurred during the period that homes are listed for sale, including utilities, taxes and maintenance. For our Mortgages segment, sales and marketing expenses include headcount expenses for loan officers and specialists supporting Zillow Home Loans.

Sales and marketing expenses decreased $11.1 million, or 5%, due primarily to decreases of $16.6 million in our Homes segment and $6.9 million in our IMT segment, partially offset by a $12.4 million increase in our Mortgages segment.

The decrease in sales and marketing expenses in the Homes segment was primarily attributable to an $8.0 million decline in home holding and selling costs driven by the reduction in the number of homes sold during the three months ended March 31, 2021 compared to the three months ended March 31, 2020, as discussed above. Further, during the three months ended March 31, 2020, Homes segment sales and marketing expenses included $5.7 million in expenses attributable to our efforts to pause home buying in response to the COVID-19 pandemic. We expect sales and marketing expenses within the Homes segment to increase in absolute dollars in future periods as we accelerate our Zillow Offers business. Sales and marketing expenses in our Homes segment included $3.9 million and $5.3 million in holding costs for the three months ended March 31, 2021 and 2020, respectively.

The decrease in sales and marketing expenses in the IMT segment was primarily attributable to an $8.4 million reduction in marketing and advertising costs, a $2.7 million decline in depreciation and amortization expense and a $2.2 million decline in travel expenses. The decreases in IMT segment sales and marketing expenses were partially offset by an increase in headcount-related expenses, including share-based compensation expense, of approximately $7.1 million. Marketing and advertising costs for the three months ended March 31, 2021 were lower than the comparable prior year period due to our pause in most discretionary spending in the first half of 2020 in response to the COVID-19 pandemic. We expect IMT sales and marketing expenses to increase in absolute dollars in future periods as we continue to increase our marketing and advertising activities.

The increase in sales and marketing expenses in the Mortgages segment was primarily attributable to a $10.4 million increase in headcount-related expenses associated with growth of our Zillow Home Loans business.

Technology and Development

Technology and development expenses consist of headcount expenses, including salaries, benefits, bonuses and share-based compensation expense for individuals engaged in the design, development and testing of our products, mobile applications and websites and the tools and applications that support our products. Technology and development expenses also include amortization costs related to capitalized website and development activities, amortization of software, amortization of certain intangibles and other data agreement costs related to the purchase of data used to populate our mobile applications and websites, amortization of intangible assets recorded in connection with acquisitions, including trade names and trademarks, developed technology and customer relationships, amongst others, equipment and maintenance costs and depreciation expense.

Technology and development expenses increased $13.9 million, or 10%, due to increases of $6.9 million in our IMT segment, $4.6 million in our Homes segment and $2.5 million in our Mortgages segment.

The increase in technology and development expenses within the IMT segment was primarily attributable to an increase of $15.0 million in headcount-related expenses, including share-based compensation expense, as we continue to invest in human capital to grow our businesses, partially offset by a decrease of $8.6 million in data acquisition costs. We expect technology and development expenses for our IMT segment to increase in absolute dollars in future periods due to expected increases in headcount.

The increase in technology and development expenses within the Homes segment was primarily attributable to an increase of $4.7 million in headcount-related expenses, including share-based compensation expense, as we have grown our teams to support the continued expected growth in the Homes segment.

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General and Administrative

General and administrative expenses consist of headcount expenses, including salaries, benefits, bonuses and share-based compensation expense for executive, finance, accounting, legal, human resources, recruiting, corporate information technology costs and other administrative support. General and administrative expenses also include legal settlement costs and estimated legal liabilities, legal, accounting and other third-party professional service fees, rent expense, depreciation expense and bad debt expense.

General and administrative expenses increased $8.3 million, or 9%, due to increases of $6.2 million in our Mortgages segment and $2.1 million in our Homes segment. IMT segment general and administrative expenses remained relatively flat quarter over quarter.

The increase in Mortgages segment general and administrative expenses was primarily due to a $5.1 million increase in headcount-related expenses, including share-based compensation expense, associated with the growth of our Zillow Home Loans business. While IMT segment general and administrative expenses remained relatively flat, there was a $6.2 million increase in headcount expenses driven by continued investment in our IMT segment products and services, offset primarily by decreases of $3.1 million in legal expenses and $1.2 million in business-related taxes.

We expect general and administrative expenses to increase in absolute dollars in future periods for all of our segments due to increased headcount expenses required to support the growth of our businesses.

Impairment Costs

We did not record any impairment costs for the three months ended March 31, 2021. Impairment costs for the three months ended March 31, 2020 consist of a $71.5 million non-cash impairment related to the Trulia trade names and trademarks intangible asset and a $5.3 million non-cash impairment related to our October 2016 equity investment. For additional information about the impairments, see Note 9 and Note 10 in our Notes to Condensed Consolidated Financial Statements of this Quarterly Report on Form 10-Q.

Loss on Extinguishment of Debt

We recorded a $1.4 million loss on extinguishment of debt during the three months ended March 31, 2021 associated with conversions of the convertible senior notes maturing in 2023, 2024 and 2026. For additional information on the loss on extinguishment, see Note 11 of our Notes to Condensed Consolidated Financial Statements of this Quarterly Report on Form 10-Q.

Other Income

Other income consists primarily of interest income earned on our cash, cash equivalents and short-term investments.

Other income decreased $7.2 million, or 75%, primarily due to a decrease in corporate other income not directly attributable to our segments driven by a rebalancing of our investment portfolio to lower risk investments with generally lower yields in light of the COVID-19 pandemic. We expect other income related to investment portfolio returns to remain relatively low for the foreseeable future as interest rates are currently projected to remain low.

Interest Expense

Our corporate interest expense consists of interest on our convertible senior notes and also includes the amortization of the debt discount and deferred issuance costs for the convertible senior notes. Refer to Note 11 of our Notes to Condensed Consolidated Financial Statements of this Quarterly Report on Form 10-Q for stated interest rates and interest payment dates for each of our convertible senior notes.

For our Homes segment, interest expense includes interest on borrowings, funding fees and other fees, including the amortization of deferred issuance costs, on the credit facilities related to our Zillow Offers business. Borrowings on these credit facilities bear interest at the one-month London Inter-Bank Offered Rate (“LIBOR”) plus an applicable margin, and in certain cases are subject to a LIBOR floor, as defined in the credit agreements.

For our Mortgages segment, interest expense includes interest on the warehouse line of credit and interest on the master repurchase agreements related to our Zillow Home Loans business. Borrowings on the warehouse line of credit and master repurchase agreements bear interest at the one-month LIBOR plus an applicable margin, and in certain cases are subject to a LIBOR floor, as defined in the agreements.

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Interest expense increased $2.0 million, or 5%, due to a $4.2 million increase in corporate interest expense not attributable to any of our segments, partially offset by a $3.8 million decrease in interest expense related to our Homes segment.

The increase in corporate interest expense not attributable to any of our segments was primarily due to the May 2020 issuance of the 2025 Notes, partially offset by the settlement of the convertible senior notes due in 2020 and 2021 in the three months ended December 31, 2020. The decrease in Homes segment interest expense was primarily attributable to the reduced number of homes financed on our credit facilities, as described above. We expect interest expense to increase in absolute dollars in future periods due to expected growth in our homes inventory as we grow our Zillow Offers business.

Income Taxes

We are subject to federal and state income taxes in the U.S. and federal and provincial income taxes in Canada. As of March 31, 2021 and December 31, 2020, we have provided a valuation allowance against our net deferred tax assets that we believe, based on the weight of available evidence, are not more likely than not to be realized. Therefore, no material current tax liability or expense has been recorded in the condensed consolidated financial statements. We have accumulated federal tax losses of approximately $1.7 billion as of December 31, 2020, which are available to reduce future taxable income. We have accumulated state tax losses of approximately $53.2 million (tax effected) as of December 31, 2020.

We recorded an income tax benefit of $2.9 million for the three months ended March 31, 2021, primarily related to state income taxes. We recorded an income tax benefit of $9.2 million for the three months ended March 31, 2020 primarily as a result of a $9.7 million income tax benefit related to the $71.5 million non-cash impairment we recorded during the three months ended March 31, 2020 related to the Trulia trade names and trademarks intangible asset. For additional information about the non-cash impairment, see Note 10 of our Notes to Condensed Consolidated Financial Statements of this Quarterly Report on Form 10-Q.

Liquidity and Capital Resources

As of March 31, 2021 and December 31, 2020, we had cash and cash equivalents, investments and restricted cash of $4.8 billion and $4.0 billion, respectively. Cash and cash equivalents balances consist of operating cash on deposit with financial institutions, money market funds and municipal securities. Investments consist of fixed income securities, which include U.S. government agency securities, municipal securities, treasury bills and certificates of deposit. Restricted cash consists of amounts funded to the reserve and collection accounts related to our credit facilities, amounts held in escrow related to funding home purchases in our mortgage origination business and amounts held in escrow related to our Zillow Closing Services business. Amounts on deposit with third-party financial institutions exceed the Federal Deposit Insurance Corporation and the Securities Investor Protection Corporation insurance limits, as applicable. As of March 31, 2021, Zillow Group and its subsidiaries were in compliance with all debt covenants specified in the facilities described below.

To preserve our liquidity in response to the COVID-19 pandemic, we temporarily paused hiring for non-critical roles, paused the majority of our advertising spending and reduced other discretionary spending during the first half of 2020. As our financial position has strengthened, we have gradually increased our hiring and marketing and advertising activities, and on March 11, 2021, we announced our plan to hire more than 2,000 employees nationwide in 2021. Additionally, we temporarily paused home buying through Zillow Offers in March of 2020 and resumed home buying activities in all markets in early August 2020. As of March 31, 2021, Zillow Offers is available in 25 markets.

Our liquidity has been positively impacted by certain provisions included in the CARES Act which provides tax provisions and other stimulus measures to affected companies. Under the CARES Act, we expect to defer certain 2020 employer payroll tax payments until the fourth quarter of 2021 and 2022. During 2020, we deferred a total of $23.8 million of such payments.

On February 17, 2021, we entered into an equity distribution agreement with certain sales agents and/or principals (the “Managers”), pursuant to which we may offer and sell from time to time, through the Managers, shares of our Class C capital stock, having an aggregate gross sales price of up to $1.0 billion, in such share amounts as we may specify by notice to the Managers, in accordance with the terms and conditions set forth in the equity distribution agreement. During the three months ended March 31, 2021, we issued and sold 3,163,502 shares of our Class C capital stock for total proceeds of $550.6 million and net proceeds of $544.6 million, after deducting $6.1 million of commissions and other offering expenses incurred. For additional information regarding the Equity Distribution Agreement, see Note 13 in our Notes to Condensed Consolidated Financial Statements of this Quarterly Report on Form 10-Q.

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In February 2021, we entered into a definitive agreement to acquire ShowingTime.com, Inc. (“ShowingTime”), a real estate showing software provider, for $500.0 million in cash, subject to adjustments, payable upon the closing of the acquisition. On April 19, 2021, each of Zillow Group and ShowingTime received a request from the U.S. Federal Trade Commission (the “FTC”) for additional information and documentary material (commonly referred to as a “Second Request”) pursuant to the Hart-Scott-Rodino Antitrust Improvements Act of 1976 (the “HSR Act”) in connection with our proposed acquisition of ShowingTime. The FTC’s Second Request extends the waiting period imposed under the HSR Act until 30 days after both Zillow Group and ShowingTime have substantially complied with the Second Request, unless the waiting period is terminated earlier by the FTC or voluntarily extended through an agreement among Zillow Group, ShowingTime and the FTC.

Zillow Group’s purchase of homes through the Zillow Offers program and sale of homes has a significant impact on our liquidity and capital resources as a cash and inventory intensive business. We primarily use debt financing through credit facilities to fund a portion of the purchase price of homes and certain related costs. As previously noted, due to the temporary pause in Zillow Offers home buying activities in response to the COVID-19 pandemic in 2020, we temporarily experienced a decrease in the amounts drawn on our credit facilities as we reduced the number of homes financed. We expect home financing to accelerate in future periods as we continue to grow our home buying in all Zillow Offers markets. As of March 31, 2021, we have $398.8 million of total outstanding borrowings on credit facilities to provide capital for Zillow Offers with a total maximum borrowing capacity of $1.5 billion.

Zillow Home Loans continues to impact our liquidity and capital resources as a cash intensive business that funds mortgage loans originated for resale in the secondary market. We primarily use debt financing to fund mortgage loan originations. As of March 31, 2021, we have $263.3 million of total outstanding borrowings on our warehouse line of credit and master repurchase agreement with a total maximum borrowing capacity of $500.0 million.

As of March 31, 2021, we have outstanding a total of $2.1 billion aggregate principal of convertible senior notes. The convertible notes are senior unsecured obligations, and interest on the convertible notes is paid semi-annually.

For additional information regarding our debt, see Note 11 of our Notes to Condensed Consolidated Financial Statements in Part I of this Quarterly Report on Form 10-Q.

We believe that cash from operations and cash and cash equivalents and investment balances will be sufficient to meet our ongoing operating activities, working capital, capital expenditures and other capital requirements for at least the next 12 months.

The following table presents selected cash flow data for the periods presented (in thousands, unaudited):

	Three Months Ended March 31,
	2021		2020
Cash Flow Data:
Net cash provided by operating activities	$	241,658	$	301,990
Net cash provided by investing activities	904,334		254,341
Net cash provided by (used in) financing activities	597,548		(163,102)

Cash Flows Provided By Operating Activities

Our operating cash flows result primarily from cash received from real estate professionals, rental professionals, mortgage professionals and brand advertisers, as well as cash received from customers for sales of homes through Zillow Offers and sales of mortgages originated by Zillow Home Loans. Our primary uses of cash from operating activities include payments for homes purchased through Zillow Offers, marketing and advertising activities, mortgages funded through Zillow Home Loans and employee compensation and benefits. Additionally, uses of cash from operating activities include costs associated with operating our mobile applications and websites and other general corporate expenditures.

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For the three months ended March 31, 2021, net cash provided by operating activities was $241.7 million. This was primarily driven by net income of $52.0 million, adjusted by share-based compensation expense of $63.7 million, depreciation and amortization expense of $28.9 million, amortization of debt discount and debt issuance costs of $25.3 million, amortization of contract cost assets of $10.1 million, amortization of right of use assets of $7.4 million, a loss on disposal of property and equipment and other assets of $4.4 million, amortization of bond premium of $4.0 million, and a loss on extinguishment of debt of $1.4 million. This was partially offset by a $2.9 million change in deferred income taxes. Changes in operating assets and liabilities increased cash provided by operating activities by $47.3 million. The changes in operating assets and liabilities are primarily related to a $56.4 million decrease in mortgage loans held for sale, a $24.9 million increase in accrued expenses and other liabilities driven by the timing of payments, an $18.9 million decrease in inventory due to the sale of homes through Zillow Offers outpacing home purchases for the three months ended March 31, 2021, a $5.2 million increase in deferred revenue, and a $2.2 million increase in accrued compensation and benefits. These changes were partially offset by a $28.6 million increase in prepaid expenses and other current assets due to timing of payments and an increase in our contract assets. The increase in contract assets was primarily associated with increased revenue from our Premier Agent Flex pricing model. The changes were further offset by a $12.6 million increase in accounts receivable due to an increase in revenue from products and services billed in arrears, a $9.6 million increase in contract cost assets due primarily to capitalized sales commissions, a $6.8 million decrease in lease liabilities, a $2.2 million decrease in accounts payable and a $0.4 million decrease in other long-term liabilities.

For the three months ended March 31, 2020, net cash provided by operating activities was $302.0 million. This was primarily driven by a net loss of $163.3 million, adjusted by non-cash impairment costs of $76.8 million, share-based compensation expense of $43.8 million, depreciation and amortization expense of $29.0 million, amortization of debt discount and debt issuance costs of $22.5 million, a $9.2 million change in deferred income taxes, amortization of contract cost assets of $8.4 million, amortization of right of use assets of $6.5 million and a loss on disposal of property and equipment of $2.0 million. Changes in operating assets and liabilities increased cash provided by operating activities by $285.0 million. The changes in operating assets and liabilities are primarily related to a $302.6 million decrease in inventory due to the sale of homes and a decrease in home purchases through Zillow Offers during the three months ended March 31, 2020, a $9.8 million increase in contract cost assets due primarily to the capitalization of sales commissions, a $7.7 million increase in accounts payable and a $4.6 million increase in accrued expenses and other liabilities driven by the timing of payments, a $5.3 million increase in accounts receivable due primarily to an increase in revenue, a $5.0 million decrease in accrued compensation and benefits, a $4.4 million decrease in deferred revenue and a $2.9 million increase in prepaid expenses and other current assets driven primarily by the timing of payments.

Cash Flows Provided By Investing Activities

Our primary investing activities include the purchase and sale or maturity of investments and the purchase of property and equipment and intangible assets.

For the three months ended March 31, 2021, net cash provided by investing activities was $904.3 million. This was the result of $920.3 million of proceeds from the maturity of investments and $16.0 million of purchases of property and equipment and intangible assets.

For the three months ended March 31, 2020, net cash provided by investing activities was $254.3 million. This was the result of $291.8 million of net proceeds from maturities and sales of investments and $37.5 million of purchases for property and equipment and intangible assets.

Cash Flows Provided By (Used In) Financing Activities

Net cash provided by financing activities has primarily resulted from net proceeds from the issuance of convertible notes, net proceeds from equity offerings, the exercise of employee option awards and equity awards withheld for tax liabilities, proceeds from and repayments of borrowings on our credit facilities related to Zillow Offers and proceeds from borrowings on our warehouse line of credit and the master repurchase agreements related to Zillow Home Loans.

For the three months ended March 31, 2021, cash provided by financing activities was $597.5 million, which was primarily related to the $544.6 million in proceeds from the sale of 3,163,502 shares of Class C capital stock under our equity distribution agreement, $61.1 million of proceeds from the exercise of option awards, and $37.7 million of net borrowings on our credit facilities related to Zillow Offers. These cash inflows were partially offset by $45.7 million of net repayments on our warehouse line of credit and master repurchase agreements related to Zillow Home Loans.

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For the three months ended March 31, 2020, cash used in financing activities was $163.1 million, including $259.7 million of net repayments of borrowings on our credit facilities related to Zillow Offers, partially offset by $92.2 million of proceeds from the exercise of option awards and $4.4 million of net borrowings on our warehouse line of credit and master repurchase agreement related to Zillow Home Loans.

Off-Balance Sheet Arrangements

We did not have any off-balance sheet arrangements other than outstanding surety bonds issued for our benefit of approximately $10.4 million as of March 31, 2021. We do not believe that the surety bonds will have a material effect on our liquidity, capital resources, market risk support or credit risk support. For additional information regarding the surety bonds, see Note 16 of our Notes to Condensed Consolidated Financial Statements of this Quarterly Report on Form 10-Q under the subsection titled “Surety Bonds”.

Contractual Obligations and Other Commitments

There have been no material changes outside the ordinary course of business in our commitments under contractual obligations as previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2020, except for the categories of contractual obligations included in the table below, which have been updated to reflect our contractual obligations as of March 31, 2021 (in thousands, unaudited):

	Payments Due By Period
	Total		Less Than 1 Year		1-3 Years		3-5 Years		More Than 5 Years
2024 Notes (1)	$	622,382	$	—	$	—	$	622,382	$	—
Interest on 2024 Notes (2)	15,949		4,668		9,336		1,945		—
Homes segment credit facilities (3)	398,836		398,836		—		—		—
Mortgages segment credit facilities (4)	263,339		263,339		—		—		—
Homes under contract (5)	511,253		511,253		—		—		—
Total contractual obligations	$	1,811,759	$	1,178,096	$	9,336	$	624,327	$	—
____________________ (1) The aggregate principal amount of the 2024 Notes is due on September 1, 2024 if not earlier converted or redeemed. (2) The stated interest rate on the 2024 Notes is 0.75%. (3) Includes principal amounts due for amounts borrowed under the credit facilities used to provide capital for our Zillow Offers business. Amounts exclude an immaterial amount of estimated interest payments. (4) Includes principal amounts due for amounts borrowed under the warehouse line of credit and master repurchase agreements to finance mortgages originated through Zillow Home Loans. Amounts exclude an immaterial amount of estimated interest payments. (5) We have obligations to purchase homes under contract through our Zillow Offers business.

As of March 31, 2021, we have outstanding letters of credit of approximately $16.9 million, which secure our lease obligations in connection with certain of the operating leases of our office spaces.

In the course of business, we are required to provide financial commitments in the form of surety bonds to third parties as a guarantee of our performance on and our compliance with certain obligations. If we were to fail to perform or comply with these obligations, any draws upon surety bonds issued on our behalf would then trigger our payment obligation to the surety bond issuer. We have outstanding surety bonds issued for our benefit of approximately $10.4 million and $10.1 million as of March 31, 2021 and December 31, 2020, respectively.

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Critical Accounting Policies and Estimates

Our condensed consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles, or GAAP. The preparation of these financial statements requires us to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenue, expenses and related disclosures. We evaluate our estimates, judgments and assumptions on an ongoing basis. Our estimates are based on historical experience and various other assumptions that we believe to be reasonable under the circumstances. Our actual results could differ from these estimates, and the COVID-19 pandemic has introduced significant additional uncertainty with respect to estimates, judgments and assumptions, which may materially impact our estimates. For information on our critical accounting policies and estimates, see Part II Item 7 (Management’s Discussion and Analysis of Financial Condition and Results of Operations) of our Annual Report on Form 10-K for the fiscal year ended December 31, 2020. There have been no material changes to our critical accounting policies and estimates as previously disclosed in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

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Item 3. Quantitative and Qualitative Disclosures About Market Risk

We are exposed to market risks in the ordinary course of our business. These risks primarily consist of fluctuations in interest rates.

Interest Rate Risk

Under our current investment policy, we invest our excess cash in money market funds, municipal securities, U.S. government agency securities, treasury bills and certificates of deposit. Our current investment policy seeks first to preserve principal, second to provide liquidity for our operating and capital needs and third to maximize yield without putting our principal at risk.

Our investments are exposed to market risk due to the fluctuation of prevailing interest rates that may reduce the yield on our investments or their fair value. As our investment portfolio is short-term in nature, we do not believe an immediate 10% increase in interest rates would have a material effect on the fair market value of our portfolio.

Our convertible senior notes bear interest at fixed rates. Thus, we have no related direct financial statement risk associated with changes in interest rates. However, the fair values of the convertible senior notes change primarily when the market price of our stock fluctuates or interest rates change. The following table summarizes our outstanding convertible senior notes as of March 31, 2021 (in thousands, except interest rates):

Maturity Date	Aggregate Principal Amount		Stated Interest Rate
September 1, 2026	$	498,800	1.375	%
May 15, 2025	565,000		2.75	%
September 1, 2024	622,382		0.75	%
July 1, 2023	372,825		1.50	%
	$	2,059,007

We are subject to market risk by way of changes in interest rates on borrowings under our credit facilities that provide capital for Zillow Offers. As of March 31, 2021 and December 31, 2020, we had outstanding $398.8 million and $361.2 million, respectively, of borrowings on these credit facilities which bear interest at a floating rate based on the one-month LIBOR plus an applicable margin, and in certain cases a LIBOR floor. Accordingly, fluctuations in market interest rates may increase or decrease our interest expense. Assuming no change in the outstanding borrowings on our credit facilities, we estimate that a one percentage point increase in LIBOR would increase our annual interest expense by approximately $4.0 million and $3.6 million as of March 31, 2021 and December 31, 2020, respectively.

We are also subject to market risk by way of changes in interest rates on borrowings under our warehouse line of credit and master repurchase agreements that provide capital for Zillow Home Loans. As of March 31, 2021 and December 31, 2020, we had outstanding $263.3 million and $309.0 million, respectively, of borrowings on our warehouse line of credit and master repurchase agreements which bear interest at a floating rate based on LIBOR plus an applicable margin, and in certain cases include a LIBOR floor. We manage the interest rate risk associated with our mortgage loan origination services through the use of forward sales of mortgage-backed securities. Assuming no change in the outstanding borrowings on the warehouse line of credit and master repurchase agreements, we estimate that a one percentage point increase in LIBOR would increase our annual interest expense associated with the warehouse line of credit and master repurchase agreements by approximately $2.6 million and $3.1 million as of March 31, 2021 and December 31, 2020, respectively.

As described above, we utilize debt facilities that bear interest at a floating rate based on LIBOR, which is expected to be phased out as a reference rate in future periods. We do not expect the eventual transition away from LIBOR to have a material impact on our financial position, results of operations or cash flows.

Inflation Risk

We do not believe that inflation has had a material effect on our business, results of operations or financial condition. If our costs were to become subject to significant inflationary pressures, we may not be able to fully offset such higher costs through price increases. Our inability or failure to do so could harm our business, results of operations and financial condition.

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Foreign Currency Exchange Risk

We do not believe that foreign currency exchange risk has had a material effect on our business, results of operations or financial condition. As we do not maintain a significant balance of foreign currency, we do not believe an immediate 10% increase or decrease in foreign currency exchange rates relative to the U.S. dollar would have a material effect on our business, results of operations or financial condition.

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Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

The Company maintains disclosure controls and procedures (as defined under Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934, as amended). Management, under the supervision and with the participation of our Chief Executive Officer and our Chief Financial Officer, evaluated the effectiveness of the Company’s disclosure controls and procedures pursuant to Exchange Act Rule 13a-15(b) as of March 31, 2021. Based on that evaluation, the Chief Executive Officer and the Chief Financial Officer concluded that these disclosure controls and procedures were effective as of March 31, 2021.

Changes in Internal Control Over Financial Reporting

There were no changes in our internal control over financial reporting identified in connection with the evaluation required by Rule 13a-15(d) and 15d-15(d) of the Exchange Act that occurred during the three months ended March 31, 2021 that have 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

For information regarding legal proceedings in which we are involved, see Note 16 under the subsection titled “Legal Proceedings” in our Notes to Condensed Consolidated Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q.

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Item 1A. Risk Factors

There have not been any material changes to the risk factors affecting our business, financial condition or future results from those set forth in Part I, Item 1A (Risk Factors) in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020. However, you should carefully consider the factors discussed in our Annual Report on Form 10-K, which could materially affect our business, financial condition or future results. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition and/or operating results.

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Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Unregistered Sales of Equity Securities

There were no unregistered sales of equity securities during the three months ended March 31, 2021.

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Item 6. Exhibits

The exhibits listed below are filed as part of this Quarterly Report on Form 10-Q.

Exhibit Number	Description
31.1	Certification of Chief Executive Officer pursuant to Rule 13-14(a) of the Securities Exchange Act of 1934 as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Chief Financial Officer pursuant to Rule 13-14(a) of the Securities Exchange Act of 1934 as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of Chief Financial Officer Pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	Inline XBRL Instance Document (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 Document.
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document.
104	Cover Page Interactive Data File (embedded within the inline XBRL document).

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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.

Dated: May 4, 2021	ZILLOW GROUP, INC.
	By:	/s/ JENNIFER ROCK
	Name:	Jennifer Rock
	Title:	Chief Accounting Officer

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EX-31.1

EXHIBIT 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO RULE 13-14(A) OF THE SECURITIES

EXCHANGE ACT OF 1934 AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Richard Barton, certify that:

1.I have reviewed this report on Form 10-Q of Zillow Group, Inc. for the fiscal quarter ended March 31, 2021;

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

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

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

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

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

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

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

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

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

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

By:	/s/ RICHARD BARTON
Name:	Richard Barton
Title:	Chief Executive Officer
Date:	May 4, 2021

EX-31.2

EXHIBIT 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO RULE 13-14(A) OF THE SECURITIES

EXCHANGE ACT OF 1934 AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Allen Parker, certify that:

1.I have reviewed this report on Form 10-Q of Zillow Group, Inc. for the fiscal quarter ended March 31, 2021;

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

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

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

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

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

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

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

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

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

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

By:	/s/ ALLEN PARKER
Name:	Allen Parker
Title:	Chief Financial Officer
Date:	May 4, 2021

EX-32.1

EXHIBIT 32.1

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906

OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Zillow Group, Inc. (the “Company”) for the fiscal quarter ended March 31, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Richard Barton, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1.The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:	/s/ RICHARD BARTON
Name:	Richard Barton
Title:	Chief Executive Officer
Date:	May 4, 2021

EX-32.2

EXHIBIT 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906

OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Zillow Group, Inc. (the “Company”) for the fiscal quarter ended March 31, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Allen Parker, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1.The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:	/s/ ALLEN PARKER
Name:	Allen Parker
Title:	Chief Financial Officer
Date:	May 4, 2021

XML

Cover Page - shares	3 Months Ended
	Mar. 31, 2021	Apr. 27, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-36853
Entity Registrant Name	ZILLOW GROUP, INC.
Entity Incorporation, State or Country Code	WA
Entity Tax Identification Number	47-1645716
Entity Address, Address Line One	1301 Second Avenue
Entity Address, Address Line Two	Floor 31
Entity Address, City or Town	Seattle
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	98101
City Area Code	206
Local Phone Number	470-7000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001617640
Current Fiscal Year End Date	--12-31
Class A Common Stock
Entity Information [Line Items]
Title of 12(b) Security	Class A Common Stock, par value $0.0001 per share
Trading Symbol	ZG
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		61,335,992
Class B Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		6,217,447
Class C Capital Stock
Entity Information [Line Items]
Title of 12(b) Security	Class C Capital Stock, par value $0.0001 per share
Trading Symbol	Z
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		180,104,154

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 3,401,762	$ 1,703,130
Short-term investments	1,294,051	2,218,108
Accounts receivable, net of allowance for doubtful accounts of $3,460 and $3,427 at March 31, 2021 and December 31, 2020, respectively	82,461	69,940
Mortgage loans held for sale		330,758
Inventory	472,397	491,293
Prepaid expenses and other current assets	107,877	75,846
Restricted cash	120,713	75,805
Total current assets	5,753,580	4,964,880
Contract cost assets	50,182	50,719
Property and equipment, net	190,234	196,152
Right of use assets	180,610	187,960
Goodwill	1,984,907	1,984,907
Intangible assets, net	87,711	94,767
Other assets	8,678	7,175
Total assets	8,255,902	7,486,560
Current liabilities:
Accounts payable	17,044	18,974
Accrued expenses and other current liabilities	121,692	94,487
Accrued compensation and benefits	49,844	47,666
Borrowings under credit facilities	662,175	670,209
Deferred revenue	54,192	48,995
Lease liabilities, current portion	28,465	28,310
Total current liabilities	933,412	908,641
Lease liabilities, net of current portion	200,762	207,723
Convertible senior notes	1,597,205	1,613,523
Other long-term liabilities	14,485	14,857
Total liabilities	2,745,864	2,744,744
Commitments and contingencies (Note 16)
Shareholders’ equity:
Preferred stock, $0.0001 par value; 30,000,000 shares authorized; no shares issued and outstanding	0	0
Additional paid-in capital	6,596,850	5,880,883
Accumulated other comprehensive income	454	164
Accumulated deficit	(1,087,291)	(1,139,255)
Total shareholders’ equity	5,510,038	4,741,816
Total liabilities and shareholders’ equity	8,255,902	7,486,560
Level 2
Current assets:
Mortgage loans held for sale	274,319
Restricted cash	0	0
Class A Common Stock
Shareholders’ equity:
Common stock/capital stock	6	6
Class B Common Stock
Shareholders’ equity:
Common stock/capital stock	1	1
Class C Capital Stock
Shareholders’ equity:
Common stock/capital stock	$ 18	$ 17

XML

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Allowance for doubtful accounts	$ 3,460	$ 3,427
Preferred stock, par value (usd per share)	$ 0.0001	$ 0.0001
Preferred stock, authorized (in shares)	30,000,000	30,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Class A Common Stock
Common stock, par value (usd per share)	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	1,245,000,000	1,245,000,000
Common stock, issued (in shares)	61,335,992	61,101,303
Common stock, outstanding (in shares)	61,335,992	61,101,303
Class B Common Stock
Common stock, par value (usd per share)	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	15,000,000	15,000,000
Common stock, issued (in shares)	6,217,447	6,217,447
Common stock, outstanding (in shares)	6,217,447	6,217,447
Class C Capital Stock
Common stock, par value (usd per share)	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	600,000,000	600,000,000
Common stock, issued (in shares)	179,754,423	173,207,170
Common stock, outstanding (in shares)	179,754,423	173,207,170

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Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Revenue:
Revenue		$ 1,218,440	$ 1,125,821
Cost of revenue (exclusive of amortization)
Cost of revenue	[1]	687,030	761,672
Sales and marketing		193,593	204,648
Technology and development		148,856	134,918
General and administrative		100,551	92,285
Impairment costs		0	76,800
Acquisition-related costs		817	0
Total costs and expenses		1,130,847	1,270,323
Income (loss) from operations		87,593	(144,502)
Loss on extinguishment of debt		(1,403)	0
Other income		2,439	9,593
Interest expense		(39,555)	(37,592)
Income (loss) before income taxes		49,074	(172,501)
Income tax benefit		2,890	9,228
Net income (loss)		$ 51,964	$ (163,273)
Net income (loss) per share:
Basic (usd per share)		$ 0.21	$ (0.78)
Diluted (usd per share)		$ 0.20	$ (0.78)
Weighted-average shares outstanding:
Basic (in shares)		243,234	210,674
Diluted (in shares)		259,346	210,674
Homes segment
Revenue:
Revenue		$ 704,152	$ 769,873
Cost of revenue (exclusive of amortization)
Cost of revenue	[1]	640,618	732,199
Sales and marketing		55,025	71,589
Technology and development		37,139	32,538
General and administrative		25,532	23,421
Impairment costs		0	0
Acquisition-related costs		0	0
Total costs and expenses		758,314	859,747
Income (loss) from operations		(54,162)	(89,874)
Other income		0	0
Interest expense		(4,312)	(8,084)
Income (loss) before income taxes		(58,474)	(97,958)
IMT
Revenue:
Revenue		446,328	330,666
Cost of revenue (exclusive of amortization)
Cost of revenue	[1]	28,016	24,318
Sales and marketing		113,298	120,173
Technology and development		101,893	95,028
General and administrative		58,729	58,754
Impairment costs		0	73,900
Acquisition-related costs		817	0
Total costs and expenses		302,753	372,173
Income (loss) from operations		143,575	(41,507)
Other income		0	0
Interest expense		0	0
Income (loss) before income taxes		143,575	(41,507)
Mortgages segment
Revenue:
Revenue		67,960	25,282
Cost of revenue (exclusive of amortization)
Cost of revenue	[1]	18,396	5,155
Sales and marketing		25,270	12,886
Technology and development		9,824	7,352
General and administrative		16,290	10,110
Impairment costs		0	2,900
Acquisition-related costs		0	0
Total costs and expenses		69,780	38,403
Income (loss) from operations		(1,820)	(13,121)
Other income		1,732	202
Interest expense		(1,732)	(226)
Income (loss) before income taxes		$ (1,820)	$ (13,145)

[1]  ____________________
(1) Amortization of website development costs and intangible assets included in technology and development

XML

Condensed Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Amortization of website development costs and intangible assets included in technology and development	$ 12,900	$ 11,800
Technology and Development
Amortization of website development costs and intangible assets included in technology and development	$ 20,838	$ 17,184

XML

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 51,964	$ (163,273)
Other comprehensive income:
Unrealized gains on investments	261	3,602
Reclassification adjustment for net investment gains included in net income (loss)	0	434
Net unrealized gains on investments	261	4,036
Currency translation adjustments	29	(90)
Total other comprehensive income	290	3,946
Comprehensive income (loss)	$ 52,254	$ (159,327)

XML

Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	2.75% convertible senior notes due 2020	Class A Common Stock, Class B Common Stock and Class C Capital Stock	Class A Common Stock, Class B Common Stock and Class C Capital Stock 2.75% convertible senior notes due 2020	Additional Paid-In Capital	Additional Paid-In Capital 2.75% convertible senior notes due 2020	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning Balance at Dec. 31, 2019	$ 3,435,421		$ 21		$ 4,412,200		$ (977,140)	$ 340
Beginning Balance (in shares) at Dec. 31, 2019			209,066,855,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common and capital stock upon exercise of stock options	92,202		$ 1		92,201
Issuance of common and capital stock upon exercise of stock options (in shares)			3,207,375,000
Vesting of restricted stock units (in shares)			638,909,000
Share-based compensation expense	47,465				47,465
Net income (loss)	(163,273)						(163,273)
Other comprehensive income	3,946							3,946
Ending Balance at Mar. 31, 2020	3,415,761		$ 22		4,551,866		(1,140,413)	4,286
Ending Balance (in shares) at Mar. 31, 2020			212,913,139,000
Beginning Balance at Dec. 31, 2020	4,741,816		$ 24		5,880,883		(1,139,255)	164
Beginning Balance (in shares) at Dec. 31, 2020			240,525,920
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common and capital stock upon exercise of stock options	$ 61,149		$ 0		61,149
Issuance of common and capital stock upon exercise of stock options (in shares)	1,602,896		1,602,896
Vesting of restricted stock units (in shares)			813,471
Restricted stock units withheld for tax liability (in shares)			(622)
Restricted stock units withheld for tax liability	$ (124)				(124)
Share-based compensation expense	67,386				67,386
Issuance of Class C capital stock in connection with equity offering, net of issuance costs of $6,054	544,558		$ 1		544,557
Issuance of Class C capital stock in connection with equity offering, net of issuance costs (in shares)			3,163,502
Conversion of convertible senior notes		$ 42,999				$ 42,999
Conversion of convertible senior notes (in shares)				1,202,720
Unwind capped call transactions (in shares)			(25)
Net income (loss)	51,964						51,964
Other comprehensive income	290							290
Ending Balance at Mar. 31, 2021	$ 5,510,038		$ 25		$ 6,596,850		$ (1,087,291)	$ 454
Ending Balance (in shares) at Mar. 31, 2021			247,307,862

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Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Statement of Stockholders' Equity [Abstract]
Capital stock, issuance costs	$ 6,054

XML

Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net income (loss)	$ 51,964,000	$ (163,273,000)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	28,899,000	29,026,000
Share-based compensation expense	63,673,000	43,795,000
Amortization of right of use assets	7,350,000	6,465,000
Amortization of contract cost assets	10,130,000	8,415,000
Amortization of debt discount and debt issuance costs	25,271,000	22,547,000
Loss on extinguishment of debt	1,403,000	0
Impairment costs	0	76,800,000
Deferred income taxes	(2,890,000)	(9,228,000)
Loss on disposal of property and equipment and other assets	4,418,000	1,952,000
Credit loss expense	128,000	558,000
Net loss on investment securities	0	434,000
Amortization (accretion) of bond premium (discount)	4,014,000	(473,000)
Changes in operating assets and liabilities:
Accounts receivable	(12,649,000)	(5,335,000)
Mortgage loans held for sale	56,439,000	(341,000)
Inventory	18,893,000	302,593,000
Prepaid expenses and other assets	(28,643,000)	(2,916,000)
Contract cost assets	(9,593,000)	(9,771,000)
Lease liabilities	(6,806,000)	(1,625,000)
Accounts payable	(2,235,000)	7,673,000
Accrued expenses and other current liabilities	24,889,000	4,588,000
Accrued compensation and benefits	2,178,000	(4,967,000)
Deferred revenue	5,197,000	(4,400,000)
Other long-term liabilities	(372,000)	(527,000)
Net cash provided by operating activities	241,658,000	301,990,000
Investing activities
Proceeds from maturities of investments	920,304,000	296,272,000
Proceeds from sales of investments	0	53,997,000
Purchases of investments	0	(58,459,000)
Purchases of property and equipment	(11,485,000)	(32,966,000)
Purchases of intangible assets	(4,485,000)	(4,503,000)
Net cash provided by investing activities	904,334,000	254,341,000
Financing activities
Proceeds from issuance of Class C capital stock, net of issuance costs	544,557,000	0
Proceeds from borrowings on credit facilities	126,010,000	34,460,000
Repayments of borrowings on credit facilities	(88,340,000)	(294,150,000)
Net borrowings (repayments) on warehouse line of credit and repurchase agreements	(45,704,000)	4,386,000
Proceeds from exercise of stock options	61,149,000	92,202,000
Value of equity awards withheld for tax liability	(124,000)	0
Net cash provided by (used in) financing activities	597,548,000	(163,102,000)
Net increase in cash, cash equivalents and restricted cash during period	1,743,540,000	393,229,000
Cash, cash equivalents and restricted cash at beginning of period	1,778,935,000	1,230,909,000
Cash, cash equivalents and restricted cash at end of period	3,522,475,000	1,624,138,000
Supplemental disclosures of cash flow information
Cash paid for interest	14,191,000	17,038,000
Noncash transactions:
Capitalized share-based compensation	3,713,000	3,670,000
Write-off of fully depreciated property and equipment	11,603,000	4,143,000
Write-off of fully amortized intangible assets	1,300,000	0
Property and equipment purchased on account	$ 905,000	$ 9,445,000

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Organization and Description of Business

3 Months Ended

Mar. 31, 2021

Accounting Policies [Abstract]

Organization and Description of Business

Organization and Description of Business

Zillow Group, Inc. is reimagining real estate to make it easier to unlock life’s next chapter. As the most visited real estate website in the United States, Zillow and its affiliates offer customers an on-demand experience for selling, buying, renting or financing with transparency and nearly seamless end-to-end service. Zillow Offers buys and sells homes directly in dozens of markets across the country, allowing sellers control over their timeline. Zillow Home Loans, our affiliate lender, provides our customers with an easy option to get pre-approved and secure financing for their next home purchase. In September 2020, Zillow launched Zillow Homes, Inc., a licensed brokerage entity, to streamline Zillow Offers transactions.

Other consumer brands include Trulia, StreetEasy, HotPads and Out East. In addition, Zillow Group provides a comprehensive suite of marketing software and technology solutions which include Mortech, dotloop, Bridge Interactive and New Home Feed. Zillow, Inc. was incorporated as a Washington corporation in December 2004, and we launched the initial version of our website, Zillow.com, in February 2006. Zillow Group, Inc. was incorporated as a Washington corporation in July 2014 in connection with our acquisition of Trulia, Inc. (“Trulia”), and upon the closing of the Trulia acquisition in February 2015, each of Zillow, Inc. and Trulia became wholly owned subsidiaries of Zillow Group, Inc.

Certain Significant Risks and Uncertainties

We operate in a dynamic industry and, accordingly, can be affected by a variety of factors. For example, we believe that changes in any of the following areas could have a significant negative effect on us in terms of our future financial position, results of operations or cash flows: public health crises, like the COVID-19 pandemic and the availability and widespread distribution and use of effective vaccines; rates of revenue growth; our ability to successfully integrate and realize the benefits of our past or future strategic acquisitions or investments; the satisfaction of conditions precedent to the closing of our proposed acquisition of ShowingTime.com, Inc., including expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Act; our ability to manage advertising inventory or pricing; engagement and usage of our products; our investment of resources to pursue strategies that may not prove effective; competition in our market; the stability of the residential real estate market and the impact of interest rate changes; changes in technology, products, markets or services by us or our competitors; addition or loss of significant customers; our ability to maintain or establish relationships with listings and data providers; our ability to obtain or maintain licenses and permits to support our current and future businesses; actual or anticipated changes to our products and services; changes in government regulation affecting our business; outcomes of legal proceedings; natural disasters and catastrophic events; scaling and adaptation of existing technology and network infrastructure; management of our growth; our ability to attract and retain qualified employees and key personnel; protection of customers’ information and other privacy concerns; protection of our brand and intellectual property; and intellectual property infringement and other claims, among other things.

XML

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2021

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Basis of Presentation

The accompanying condensed consolidated financial statements include Zillow Group, Inc. and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. These condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Accordingly, these interim condensed consolidated financial statements should be read in conjunction with the audited financial statements and accompanying notes included in Zillow Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2020, which was filed with the SEC on February 12, 2021. The condensed consolidated balance sheet as of December 31, 2020, included herein, was derived from the audited financial statements of Zillow Group, Inc. as of that date.

The unaudited condensed consolidated interim financial statements, in the opinion of management, reflect all adjustments, consisting only of normal recurring adjustments, necessary to present fairly our financial position as of March 31, 2021 and our results of operations, comprehensive income (loss), shareholders’ equity and cash flows for the three months ended March 31, 2021 and 2020. The results for the three months ended March 31, 2021 are not necessarily indicative of the results to be expected for the year ending December 31, 2021 or for any interim period or for any other future year.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and the related disclosures at the date of the financial statements, as well as the reported amounts of revenue and expenses during the periods presented. On an ongoing basis, we evaluate our estimates, including those related to the accounting for certain revenue offerings, the net realizable value of inventory, amortization period and recoverability of contract cost assets, website and software development costs, recoverability of long-lived assets and intangible assets, share-based compensation, income taxes, business combinations and the recoverability of goodwill, among others. To the extent there are material differences between these estimates, judgments or assumptions and actual results, our financial statements will be affected. The COVID-19 pandemic has introduced significant additional uncertainty with respect to estimates, judgments and assumptions, which may materially impact the estimates previously listed, among others.

Recently Adopted Accounting Standards

In December 2019, the Financial Accounting Standards Board (“FASB”) issued guidance which is intended to simplify the accounting for income taxes. It removes certain exceptions to the general principles and clarifies and amends existing guidance to improve consistent application. This guidance is effective for interim and annual periods beginning after December 15, 2020, and early adoption is permitted. We adopted this guidance on January 1, 2021. The method of adoption for this guidance varies based on the amendment, however the relevant amendments have been applied on a prospective basis. The adoption of this guidance did not have a material impact on our financial position, results of operations or cash flows.

Recently Issued Accounting Standards Not Yet Adopted

In August 2020, the FASB issued guidance which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts in an entity’s own equity. Among other changes, the guidance removes the liability and equity separation models for convertible instruments. Instead, entities will account for convertible debt instruments wholly as debt unless convertible instruments contain features that require bifurcation as a derivative or that result in substantial premiums accounted for as paid-in capital. The guidance also requires the application of the if-converted method to calculate the impact of convertible instruments on diluted earnings per share. The guidance is effective for fiscal years beginning after December 15, 2021, with early adoption permitted for fiscal years beginning after December 15, 2020, and can be adopted on either a retrospective or modified retrospective basis. We expect to adopt this guidance on January 1, 2022. Although we continue to evaluate the method of adoption and impact of this guidance on our financial position, results of operations and cash flows, upon adoption we expect this guidance to result in a reclassification of conversion feature balances from additional paid-in capital to debt and to decrease reported interest expense for our convertible senior notes.

In March 2020, the FASB issued guidance which provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions that reference the London Inter-Bank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued because of reference rate reform. This guidance is optional 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. This guidance is effective from March 12, 2020 through December 31, 2022. Entities may elect to adopt the amendments for contract modifications 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. We expect to apply some of the expedients and exceptions provided in this guidance to our credit facilities, warehouse line of credit and master repurchase agreements, all of which reference the one-month LIBOR in the applicable interest rate, as publication of the one-month LIBOR is expected to cease after June 30, 2023. We expect to amend our facility agreements prior to that date. As the goal of the reference rate reform transition is for it to be economically neutral to entities, we do not believe the adoption of this guidance will have a material impact on our financial position, results of operations or cash flows.

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Fair Value Measurements

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

We applied the following methods and assumptions in estimating our fair value measurements:

Cash equivalents — The fair value measurement of money market funds is based on quoted market prices in active markets (Level 1). The fair value measurement of other cash equivalents is based on observable market-based inputs principally derived from or corroborated by observable market data (Level 2).

Short-term investments — The fair value measurement of our short-term investments is based on observable market-based inputs or inputs that are derived principally from or corroborated by observable market data by correlation or other means (Level 2).

Restricted cash — The carrying value of restricted cash approximates fair value due to the short period of time amounts borrowed on the credit facilities are outstanding and amounts are held in escrow (Level 1).

Mortgage loans held for sale — The fair value of mortgage loans held for sale is generally calculated by reference to quoted prices in secondary markets for commitments to sell mortgage loans with similar characteristics (Level 2).

Interest rate lock commitments — The fair value of interest rate lock commitments (“IRLCs”) is calculated by reference to quoted prices in secondary markets for commitments to sell mortgage loans with similar characteristics. Expired commitments are excluded from the fair value measurement. Since not all IRLCs will become closed loans, we adjust our fair value measurements for the estimated amount of IRLCs that will not close. This adjustment is effected through the pull-through rate, which represents the probability that an interest rate lock commitment will ultimately result in a closed loan (Level 3).

The following table presents the range and weighted-average pull-through rates used in determining the fair value of IRLCs as of the dates presented:

	March 31, 2021	December 31, 2020
Range	50% - 100%	47% - 100%
Weighted-average	81%	75%

Forward contracts — The fair value of mandatory loan sales commitments and derivative instruments such as forward sales of mortgage-backed securities that are utilized as economic hedging instruments are calculated by reference to quoted prices for similar assets (Level 2).

The following tables present the balances of assets and liabilities measured at fair value on a recurring basis, by level within the fair value hierarchy, as of the dates presented (in thousands):

	March 31, 2021
	Total		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	3,074,175	$	3,074,175	$	—	$	—
Short-term investments:
U. S. government agency securities	988,774		—		988,774		—
Treasury bills	298,984		—		298,984		—
Municipal securities	6,044		—		6,044		—
Certificates of deposit	249		—		249		—
Restricted cash	120,713		120,713		—		—
Mortgage origination-related:
Mortgage loans held for sale	274,319		—		274,319		—
IRLCs	5,002		—		—		5,002
Forward contracts - other current assets	4,946		—		4,946		—
Forward contracts - other current liabilities	(16)		—		(16)		—
Total	$	4,773,190	$	3,194,888	$	1,573,300	$	5,002

	December 31, 2020
	Total		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	1,486,384	$	1,486,384	$	—	$	—
Municipal securities	3,228		—		3,228		—
Short-term investments:
Treasury bills	1,163,813		—		1,163,813		—
U. S. government agency securities	1,037,577		—		1,037,577		—
Municipal securities	16,220		—		16,220		—
Certificates of deposit	498		—		498		—
Restricted cash	75,805		75,805		—		—
Mortgage origination-related:
Mortgage loans held for sale	330,758		—		330,758		—
IRLCs	12,342		—		—		12,342
Forward contracts - other current liabilities	(2,608)		—		(2,608)		—
Total	$	4,124,017	$	1,562,189	$	2,549,486	$	12,342

The following table presents the changes in our IRLCs during the three months ended March 31, 2021 (in thousands):

	Three Months Ended March 31, 2021		Three Months Ended March 31, 2020
Balance, beginning of the period	$	12,342	$	937
Issuances	18,301		5,208
Transfers	(24,398)		(5,349)
Fair value changes recognized in earnings	(1,243)		1,429
Balance, end of period	$	5,002	$	2,225

At March 31, 2021, the notional amounts of the hedging instruments related to our mortgage loans held for sale were $336.2 million and $560.0 million for our IRLCs and forward contracts, respectively. At December 31, 2020, the notional amounts of the hedging instruments related to our mortgage loans held for sale were $378.1 million and $652.1 million for our IRLCs and forward contracts, respectively. We do not have the right to offset our derivative positions.

See Note 11 for the carrying amount and estimated fair value of our convertible senior notes.

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Cash and Cash Equivalents, Short-term Investments and Restricted Cash

3 Months Ended

Mar. 31, 2021

Cash and Cash Equivalents [Abstract]

Cash and Cash Equivalents, Short-term Investments and Restricted Cash

Cash and Cash Equivalents, Short-term Investments and Restricted Cash

The following tables present the amortized cost, gross unrealized gains and losses and estimated fair market value of our cash and cash equivalents, short-term investments and restricted cash as of the dates presented (in thousands):

	March 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Market Value
Cash	$	327,587	$	—	$	—	$	327,587
Cash equivalents:
Money market funds	3,074,175		—		—		3,074,175
Short-term investments:
U. S. government agency securities	988,478		303		(7)		988,774
Treasury bills	298,953		31		—		298,984
Municipal securities	6,046		—		(2)		6,044
Certificates of deposit	249		—		—		249
Restricted cash	120,713		—		—		120,713
Total	$	4,816,201	$	334	$	(9)	$	4,816,526

	December 31, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Market Value
Cash	$	213,518	$	—	$	—	$	213,518
Cash equivalents:
Money market funds	1,486,384		—		—		1,486,384
Municipal securities	3,229		—		(1)		3,228
Short-term investments:
Treasury bills	1,163,748		65		—		1,163,813
U.S. government agency securities	1,037,572		57		(52)		1,037,577
Municipal securities	16,226		—		(6)		16,220
Certificates of deposit	498		—		—		498
Restricted cash	75,805		—		—		75,805
Total	$	3,996,980	$	122	$	(59)	$	3,997,043

All short-term investments as of March 31, 2021 have a contractual maturity date of one year or less.

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Inventory

3 Months Ended

Mar. 31, 2021

Inventory Disclosure [Abstract]

Inventory

Inventory

The following table presents the components of inventory, net of applicable lower of cost or net realizable value adjustments, as of the dates presented (in thousands):

	March 31, 2021		December 31, 2020
Finished goods	$	341,887	$	339,372
Work-in-process	130,510		151,921
Inventory	$	472,397	$	491,293

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Contract Balances

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Contract Balances

Contract Balances

Contract assets were $34.3 million and $20.8 million as of March 31, 2021 and December 31, 2020, respectively. Contract assets are recorded within prepaids and other current assets in our condensed consolidated balance sheets.

For the three months ended March 31, 2021 and 2020, we recognized revenue of $46.5 million and $36.0 million, respectively, that was included in the deferred revenue balance at the beginning of the related period.

Contract Cost AssetsAs of March 31, 2021 and December 31, 2020, we had $50.2 million and $50.7 million, respectively, of contract cost assets. During the three months ended March 31, 2021 and 2020, we did not incur any impairment losses to our contract cost assets. We recorded amortization expense related to contract cost assets of $10.1 million and $8.4 million during the three months ended March 31, 2021 and 2020, respectively.

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Contract Cost Assets

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Contract Cost Assets

Contract Balances

Contract assets were $34.3 million and $20.8 million as of March 31, 2021 and December 31, 2020, respectively. Contract assets are recorded within prepaids and other current assets in our condensed consolidated balance sheets.

For the three months ended March 31, 2021 and 2020, we recognized revenue of $46.5 million and $36.0 million, respectively, that was included in the deferred revenue balance at the beginning of the related period.

Contract Cost AssetsAs of March 31, 2021 and December 31, 2020, we had $50.2 million and $50.7 million, respectively, of contract cost assets. During the three months ended March 31, 2021 and 2020, we did not incur any impairment losses to our contract cost assets. We recorded amortization expense related to contract cost assets of $10.1 million and $8.4 million during the three months ended March 31, 2021 and 2020, respectively.

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Property and Equipment, net

3 Months Ended

Mar. 31, 2021

Property, Plant and Equipment [Abstract]

Property and Equipment, net

Property and Equipment, net

The following table presents the detail of property and equipment as of the dates presented (in thousands):

	March 31, 2021		December 31, 2020
Website development costs	$	110,971	$	95,466
Leasehold improvements	102,632		110,280
Office equipment, furniture and fixtures	34,561		39,607
Construction-in-progress	32,553		44,151
Computer equipment	20,209		20,433
Property and equipment	300,926		309,937
Less: accumulated amortization and depreciation	(110,692)		(113,785)
Property and equipment, net	$	190,234	$	196,152

We recorded depreciation expense related to property and equipment (other than website development costs) of $7.9 million and $11.8 million during the three months ended March 31, 2021 and 2020, respectively.

We capitalized $12.4 million and $12.5 million in website development costs during the three months ended March 31, 2021 and 2020, respectively. Amortization expense for website development costs included in technology and development expenses was $8.0 million and $5.4 million during the three months ended March 31, 2021 and 2020, respectively.

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Equity Investment	3 Months Ended
	Mar. 31, 2021
Equity Method Investments and Joint Ventures [Abstract]
Equity Investment	Equity InvestmentIn October 2016, we purchased a 10% equity interest in a privately held variable interest entity within the real estate industry for $10.0 million. In March 2020, we recognized a non-cash impairment charge of $5.3 million related to this investment. The impairment charge is included in impairment costs within our IMT segment for the three months ended March 31, 2020. We sold our 10% equity interest in June 2020.

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Intangible Assets, net

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets, net

Intangible Assets, net

The following tables present the detail of intangible assets as of the dates presented (in thousands):

	March 31, 2021
	Cost		Accumulated Amortization		Net
Trade names and trademarks	$	36,500	$	(5,105)	$	31,395
Software	33,764		(13,155)		20,609
Developed technology	86,064		(73,507)		12,557
Customer relationships	87,600		(76,429)		11,171
Intangibles-in-progress	9,886		—		9,886
Purchased content	49,565		(47,472)		2,093
Total	$	303,379	$	(215,668)	$	87,711

	December 31, 2020
	Cost		Accumulated Amortization		Net
Trade names and trademarks	$	36,500	$	(3,822)	$	32,678
Software	28,515		(11,483)		17,032
Developed technology	86,064		(70,270)		15,794
Customer relationships	87,600		(73,301)		14,299
Intangibles-in-progress	11,863		—		11,863
Purchased content	47,930		(44,829)		3,101
Total	$	298,472	$	(203,705)	$	94,767

Amortization expense recorded for intangible assets for the three months ended March 31, 2021 and 2020 was $12.9 million and $11.8 million, respectively. These amounts are included in technology and development expenses.

We did not record any impairment costs related to our intangible assets for the three months ended March 31, 2021. During the three months ended March 31, 2020, we recognized a non-cash impairment charge of $71.5 million related to our Trulia trade names and trademarks intangible asset, which historically had not been subject to amortization. The impairment charge is included in impairment costs within our IMT and Mortgages segments. In March 2020, we identified factors directly related to the COVID-19 pandemic that led us to conclude it was more likely than not that the $108.0 million carrying value of the asset exceeded its fair value. Accordingly, with the assistance of a third-party valuation specialist, we performed a quantitative analysis to determine the fair value of the intangible asset and concluded that our best estimate of its fair value was $36.5 million. The remaining carrying value of the intangible asset will be amortized on an accelerated basis commensurate with the projected cash flows expected to be generated by the intangible asset over a useful life of 10 years. The carrying value of the Trulia trade names and trademarks intangible asset was $31.4 million and $32.7 million as of March 31, 2021 and December 31, 2020, respectively. For additional details regarding this impairment, see Note 11 in the Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

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Debt

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Debt

Debt

The following table presents the carrying values of Zillow Group’s debt as of the dates presented (in thousands):

	March 31, 2021		December 31, 2020
Homes segment
Credit facilities:
Goldman Sachs Bank USA	$	190,176	$	145,825
Citibank, N.A.	109,732		87,103
Credit Suisse AG, Cayman Islands	98,928		128,238
Total Homes segment debt	398,836		361,166
Mortgages segment
Repurchase agreements:
Credit Suisse AG, Cayman Islands	132,001		149,913
Citibank, N.A.	50,546		90,227
Warehouse line of credit:
Comerica Bank	80,792		68,903
Total Mortgages segment debt	263,339		309,043
Convertible senior notes
1.375% convertible senior notes due 2026	352,077		347,566
2.75% convertible senior notes due 2025	421,770		414,888
0.75% convertible senior notes due 2024	493,044		524,273
1.50% convertible senior notes due 2023	330,314		326,796
Total convertible senior notes	1,597,205		1,613,523
Total debt	$	2,259,380	$	2,283,732

Homes Segment

To provide capital for Zillow Offers, we utilize credit facilities that are classified as current liabilities in our condensed consolidated balance sheets. We classify these credit facilities as current liabilities as amounts drawn to purchase homes are typically due as homes are sold, which we expect to be within one year. The following table summarizes certain details related to our credit facilities (in thousands, except interest rates):

Lender	Final Maturity Date	Maximum Borrowing Capacity		Weighted-Average Interest Rate
Goldman Sachs Bank USA	April 20, 2022	$	500,000	3.15	%
Citibank, N.A.	November 30, 2021	500,000		2.86	%
Credit Suisse AG, Cayman Islands	December 31, 2022	500,000		2.86	%
	Total	$	1,500,000

On January 6, 2021, certain wholly owned subsidiaries of Zillow Group amended the Credit Suisse AG, Cayman Islands credit agreement previously maturing on July 31, 2021 such that it now matures on December 31, 2022.

Undrawn amounts available under the credit facilities included in the table above are not committed, meaning the applicable lender is not committed to, but may in its discretion, advance loan funds in excess of the outstanding borrowings. The final maturity dates are inclusive of extensions which are subject to agreement by the respective lender.

On February 23, 2021, certain wholly owned subsidiaries of Zillow Group amended and restated the Citibank, N.A. credit agreement in order to facilitate a titling trust structure. In March 2021, Zillow Group, through Zillow Offers, began buying and selling homes through a titling trust. The titling trust facilitates the allocation of beneficial ownership of properties to special purpose entities (each, an “SPE”), which special purpose entities are then party to agreements to finance the properties. Zillow Group initially formed these SPEs to purchase and sell residential properties through Zillow Offers, and subsequent to the creation of the titling trust, these SPEs hold beneficial interests in homes purchased by the titling trust, which the SPEs subsequently finance. Each SPE is a wholly owned subsidiary of Zillow Group and a separate legal entity, and neither the assets nor credit of any such SPE are available to satisfy the debts and other obligations of any affiliate or other entity. The credit facilities are secured by the assets and equity of one or more SPEs. These SPEs and titling trust are variable interest entities and Zillow Group is the primary beneficiary as it has the power to control the activities that most significantly impact the SPEs’ and titling trust’s economic performance and the obligation to absorb losses of the SPEs and titling trust or the right to receive benefits that could potentially be significant to the SPEs and titling trust. The SPEs and titling trust are consolidated within Zillow Group’s condensed consolidated financial statements. As of March 31, 2021 and December 31, 2020, the total assets of the SPEs and titling trust were $573.6 million and $551.2 million, respectively, of which $471.9 million and $491.3 million are inventory, respectively, $83.2 million and $53.0 million are restricted cash, respectively, and $16.4 million and $3.9 million are accounts receivable, respectively. As of March 31, 2021 and December 31, 2020, the total liabilities of the SPEs and titling trust were $411.6 million and $372.5 million, respectively, of which $398.8 million and $361.2 million are credit facility borrowings, respectively, and $9.9 million and $10.8 million are accrued expenses, respectively.

Outstanding amounts drawn under each credit facility are required to be repaid on the facility maturity date or earlier if accelerated due to an event of default. Further, each SPE is required to repay any resulting shortfall if the value of the eligible properties owned by such SPE falls below a certain percentage of the principal amount outstanding under the applicable credit facility. Continued inclusion of properties in each credit facility is subject to various eligibility criteria. For example, aging criteria limit the inclusion in the borrowing base of properties owned longer than a specified number of days, and properties owned for longer than one year are generally ineligible.

The stated interest rate on our credit facilities is one-month LIBOR plus an applicable margin, and in certain cases include a LIBOR floor, as defined in the respective credit agreements. Our credit facilities include customary representations and warranties, provisions regarding events of default and covenants. The terms of these credit facilities and related financing documents require Zillow Group and certain of its subsidiaries, as applicable, to comply with a number of customary financial and other covenants, such as maintaining certain levels of liquidity, tangible net worth and leverage ratios. As of March 31, 2021, Zillow Group was in compliance with all financial covenants and no event of default had occurred. Except for certain limited circumstances, the credit facilities are non-recourse to Zillow Group. Our credit facilities require that we establish, maintain and in certain circumstances that Zillow Group fund specified reserve accounts. These reserve accounts include, but are not limited to, interest reserves, insurance reserves, tax reserves, renovation cost reserves and reserves for specially permitted liens. Amounts funded to these reserve accounts and the collection accounts have been classified within our condensed consolidated balance sheets as restricted cash.

Mortgages Segment

To provide capital for Zillow Home Loans, we utilize master repurchase agreements and a warehouse line of credit which are classified as current liabilities in our condensed consolidated balance sheets. The repurchase agreements and warehouse line of credit provide short-term financing between the issuance of a mortgage loan and when Zillow Home Loans sells the loan to an investor or directly to an agency. The following table summarizes certain details related to our repurchase agreements and warehouse line of credit (in thousands, except interest rates):

Lender	Maturity Date	Maximum Borrowing Capacity		Weighted-Average Interest Rate
Credit Suisse AG, Cayman Islands	March 18, 2022	$	300,000	2.50	%
Citibank, N.A.	October 26, 2021	100,000		1.86	%
Comerica Bank	June 26, 2021	100,000		3.01	%
	Total	$	500,000

On March 19, 2021, Zillow Home Loans amended its Credit Suisse AG, Cayman Islands (“Credit Suisse”) master repurchase agreement to increase the uncommitted total maximum borrowing capacity to $300.0 million with a maturity date of March 18, 2022. The repurchase agreement with Citibank, N.A. includes a committed amount of $25.0 million.

In accordance with the master repurchase agreements, Credit Suisse and Citibank, N.A. (together the “Lenders”) have agreed to pay Zillow Home Loans a negotiated purchase price for eligible loans, and Zillow Home Loans has simultaneously agreed to repurchase such loans from the Lenders under a specified timeframe at an agreed upon price that includes interest. The master repurchase agreements contain margin call provisions that provide the Lenders with certain rights in the event of a decline in the market value of the assets purchased under the master repurchase agreements. As of March 31, 2021 and December 31, 2020, $189.9 million and $240.1 million, respectively, in mortgage loans held for sale were pledged as collateral under the master repurchase agreements.

On February 4, 2021, Zillow Home Loans amended its Comerica Bank warehouse line of credit to increase the total maximum borrowing capacity to $100.0 million with a maturity date of June 26, 2021. The warehouse line of credit with Comerica Bank is committed.

Borrowings on the repurchase agreements and warehouse line of credit bear interest at the one-month LIBOR plus an applicable margin, and in certain cases include a LIBOR floor, as defined in the governing agreements, and are secured by residential mortgage loans held for sale. The repurchase agreements and warehouse line of credit include customary representations and warranties, covenants and provisions regarding events of default. As of March 31, 2021, Zillow Home Loans was in compliance with all financial covenants and no event of default had occurred. The repurchase agreements and warehouse line of credit are recourse to Zillow Home Loans, and have no recourse to Zillow Group or any of its other subsidiaries.

For additional details related to our warehouse line of credit and repurchase agreements, see Note 14 in the Notes to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

Convertible Senior Notes

The following tables summarize certain details related to our outstanding convertible senior notes as of the dates presented or for the periods ended (in thousands, except interest rates):

									March 31, 2021				December 31, 2020
Maturity Date	Aggregate Principal Amount		Stated Interest Rate		Effective Interest Rate		First Interest Payment Date	Semi-Annual Interest Payment Dates	Unamortized Debt Discount and Debt Issuance Costs		Fair Value		Unamortized Debt Discount and Debt Issuance Costs		Fair Value
September 1, 2026	$	498,800	1.375	%	8.10	%	March 1, 2020	March 1; September 1	$	146,723	$	1,476,837	$	152,434	$	1,508,675
May 15, 2025	565,000		2.75	%	10.32	%	November 15, 2020	May 15; November 15	143,230		1,172,674		150,112		1,168,855
September 1, 2024	622,382		0.75	%	7.69	%	March 1, 2020	March 1; September 1	129,338		1,854,113		148,727		2,023,280
July 1, 2023	372,825		1.50	%	6.99	%	January 1, 2019	January 1; July 1	42,511		611,522		46,954		633,039
Total	$	2,059,007							$	461,802	$	5,115,146	$	498,227	$	5,333,849

	Three Months Ended March 31, 2021								Three Months Ended March 31, 2020
Maturity Date	Contractual Coupon Interest		Amortization of Debt Discount		Amortization of Debt Issuance Costs		Interest Expense		Contractual Coupon Interest		Amortization of Debt Discount		Amortization of Debt Issuance Costs		Interest Expense
September 1, 2026	$	1,717	$	5,226	$	128	$	7,071	$	1,719	$	4,824	$	118	$	6,661
May 15, 2025	3,884		6,533		349		10,766		—		—		—		—
September 1, 2024	1,238		8,410		289		9,937		1,248		7,861		267		9,376
July 1, 2023	1,401		3,950		386		5,737		1,402		3,697		361		5,460
December 1, 2021	—		—		—		—		2,300		4,911		508		7,719
December 15, 2020	—		—		—		—		66		—		—		66
Total	$	8,240	$	24,119	$	1,152	$	33,511	$	6,735	$	21,293	$	1,254	$	29,282

The convertible notes are senior unsecured obligations and are classified as long-term debt in our condensed consolidated balance sheets based on their contractual maturity dates. Interest on the convertible notes is paid semi-annually in arrears. The estimated fair value of the convertible senior notes was determined through consideration of quoted market prices. The fair value is classified as Level 3 due to the limited trading activity for each of the convertible senior notes.

The convertible senior notes maturing in 2026 (“2026 Notes”), 2025 (“2025 Notes”), 2024 (“2024 Notes”) and 2023 (“2023 Notes”) (together, the “Notes”) are convertible into cash, shares of Class C capital stock or a combination thereof, at our election, and may be settled as described below. The Notes will mature on their respective maturity date, unless earlier repurchased, redeemed or converted in accordance with their terms.

The following table summarizes the conversion and redemption options with respect to the Notes:

Maturity Date	Early Conversion Date	Conversion Rate	Conversion Price		Optional Redemption Date
September 1, 2026	March 1, 2026	22.9830	$	43.51	September 5, 2023
May 15, 2025	November 15, 2024	14.8810	67.20		May 22, 2023
September 1, 2024	March 1, 2024	22.9830	43.51		September 5, 2022
July 1, 2023	April 1, 2023	12.7592	78.37		July 6, 2021

The following table summarizes certain details related to the capped call confirmations with respect to certain of the convertible senior notes:

Maturity Date	Initial Cap Price		Cap Price Premium
September 1, 2026	$	80.5750	150	%
September 1, 2024	72.5175		125	%
July 1, 2023	105.45		85	%
December 1, 2021	69.19		85	%

Each series of the Notes was convertible during the three months ended March 31, 2021, at the option of the holders. The following table summarizes the conversion activity for the Notes for the period presented (in thousands, except for share amounts):

	Three Months Ended March 31, 2021
	2023 Notes		2024 Notes		2026 Notes		Total
Aggregate principal amount converted	$	925	$	50,618	$	1,200	$	52,743
Shares of Class C capital stock issued upon conversion	11,789		1,163,352		27,579		1,202,720
Total fair value of consideration transferred (1)	$	1,643	$	153,925	$	4,204	$	159,772
Loss on extinguishment of debt:
Consideration allocated to the liability component (2)	$	841	$	41,267	$	883	$	42,991
Carrying value of the liability component, net of unamortized debt discount and debt issuance costs	818		39,927		843		41,588
Loss on extinguishment of debt	$	23	$	1,340	$	40	$	1,403
Consideration allocated to the equity component	$	802	$	112,658	$	3,321	$	116,781
(1) Total fair value of consideration transferred includes the value of shares transferred to note holders using the daily volume weighted-average price of our Class C capital stock on the conversion date and an immaterial amount of cash paid in lieu of fractional shares.
(2) Consideration allocated to the liability component is based on the fair value of the liability component immediately prior to settlement, which was calculated using a discounted cash flow analysis with a market interest rate of a similar liability that does not have an associated convertible feature.

For more than 20 trading days during the 30 consecutive trading days ended March 31, 2021, the last reported sale price of our Class C capital stock exceeded 130% of the conversion price of each series of the Notes. Accordingly, each series of the Notes is convertible at the option of the holders from April 1 through June 30, 2021. The 2026 Notes and 2024 Notes were first convertible during the three months ended September 30, 2020, and the 2025 Notes and 2023 Notes were first convertible during the three months ended March 31, 2021.

For additional details related to our convertible senior notes, see Note 14 in the Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

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Income Taxes

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

We are subject to federal and state income taxes in the U.S. and federal and provincial income taxes in Canada. As of March 31, 2021 and December 31, 2020, we have provided a valuation allowance against our net deferred tax assets that we believe, based on the weight of available evidence, are not more likely than not to be realized. Therefore, no material current tax liability or expense has been recorded in the condensed consolidated financial statements. We have accumulated federal tax losses of approximately $1.7 billion as of December 31, 2020, which are available to reduce future taxable income. We have accumulated state tax losses of approximately $53.2 million (tax effected) as of December 31, 2020.

We recorded an income tax benefit of $2.9 million for the three months ended March 31, 2021, primarily related to state income taxes. We recorded an income tax benefit of $9.2 million for the three months ended March 31, 2020 primarily as a result of a $9.7 million income tax benefit related to the $71.5 million non-cash impairment we recorded during the three months ended March 31, 2020 related to the Trulia trade names and trademarks intangible asset. For additional information about the non-cash impairment, see Note 10 of our condensed consolidated financial statements.

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Shareholders' Equity

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Shareholders' Equity

Shareholders’ Equity

Preferred Stock

Our board of directors has the authority to fix and determine and to amend the number of shares of any series of preferred stock that is wholly unissued or to be established and to fix and determine and to amend the designation, preferences, voting powers and limitations and the relative, participating, optional or other rights, of any series of shares of preferred stock that is wholly unissued or to be established, subject in each case to certain approval rights of holders of our outstanding Class B common stock. There was no preferred stock issued and outstanding as of March 31, 2021 or December 31, 2020.

Common and Capital Stock

Our Class A common stock has no preferences or privileges and is not redeemable. Holders of Class A common stock are entitled to one vote for each share.

Our Class B common stock has no preferences or privileges and is not redeemable. At any time after the date of issuance, each share of Class B common stock, at the option of the holder, may be converted into one share of Class A common stock, or automatically converted into Class A common stock upon the affirmative vote by or written consent of holders of a majority of the shares of the Class B common stock. Holders of Class B common stock are entitled to 10 votes for each share.

Our Class C capital stock has no preferences or privileges, is not redeemable and, except in limited circumstances, is non-voting.

Equity Distribution Agreement

On February 17, 2021, we entered into an equity distribution agreement with certain sales agents and/or principals (the “Managers”), pursuant to which we may offer and sell from time to time, through the Managers, shares of our Class C capital stock, having an aggregate gross sales price of up to $1.0 billion, in such share amounts as we may specify by notice to the Managers, in accordance with the terms and conditions set forth in the equity distribution agreement.

The following table summarizes the activity pursuant to the equity distribution agreement for the period presented (in thousands, except share and per share amounts):

	Three Months Ended March 31, 2021
Shares of Class C capital stock issued	3,163,502
Weighted-average issuance price per share	$	174.0511
Gross proceeds (1)	$	550,611

(1) Net proceeds were $544.6 million after deducting $6.1 million of commissions and other offering expenses incurred.

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Share-Based Awards

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Share-Based Awards

Share-Based Awards

Option Awards

The following table summarizes option award activity for the three months ended March 31, 2021:

	Number of Shares Subject to Existing Options	Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2021	20,051,051	$	42.68	7.22	$	1,751,105
Granted	8,226,833	133.88
Exercised	(1,602,896)	38.15
Forfeited or cancelled	(373,388)	47.58
Outstanding at March 31, 2021	26,301,600	71.41		7.99	1,580,222
Vested and exercisable at March 31, 2021	9,411,270	39.23		6.05	851,494

The fair value of options granted is estimated at the date of grant using the Black-Scholes-Merton option-pricing model, assuming no dividends and with the following assumptions for the periods presented:

	Three Months Ended March 31,
	2021	2020
Expected volatility	52%-55%	45%-48%
Expected dividend yield	—	—
Risk-free interest rate	0.57%-0.90%	0.87%-0.93%
Weighted-average expected life	4.50-5.75 years	5.00-5.50 years
Weighted-average fair value of options granted	$59.74	$20.75

As of March 31, 2021, there was a total of $638.0 million in unrecognized compensation cost related to unvested stock options.

Restricted Stock Units

The following table summarizes activity for restricted stock units for the three months ended March 31, 2021:

	Restricted Stock Units	Weighted- Average Grant- Date Fair Value
Unvested outstanding at January 1, 2021	7,316,557	$	48.14
Granted	930,831	138.13
Vested	(813,471)	44.96
Forfeited	(162,972)	48.73
Unvested outstanding at March 31, 2021	7,270,945	60.01

As of March 31, 2021, there was a total of $411.1 million in unrecognized compensation cost related to unvested restricted stock units.

Share-Based Compensation Expense

The following table presents the effects of share-based compensation expense in our condensed consolidated statements of operations during the periods presented (in thousands):

	Three Months Ended March 31,
	2021		2020
Cost of revenue	$	2,386	$	1,173
Sales and marketing	9,887		6,993
Technology and development	26,393		18,917
General and administrative	25,007		16,712
Total	$	63,673	$	43,795

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Net Income (Loss) Per Share

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Net Income (Loss) Per Share

Net Income (Loss) Per Share

Basic net income (loss) per share is computed by dividing net income (loss) by the weighted-average number of shares (including Class A common stock, Class B common stock and Class C capital stock) outstanding during the period. In the calculation of basic net income (loss) per share, undistributed earnings are allocated assuming all earnings during the period were distributed.

Diluted net income (loss) per share is computed by dividing net income (loss) by the weighted-average number of shares (including Class A common stock, Class B common stock and Class C capital stock) outstanding during the period and potentially dilutive Class A common stock and Class C capital stock equivalents, except in cases where the effect of the Class A common stock or Class C capital stock equivalent would be antidilutive. Potential Class A common stock and Class C capital stock equivalents consist of Class A common stock and Class C capital stock issuable upon exercise of stock options and Class A common stock and Class C capital stock underlying unvested restricted stock units using the treasury stock method. Potential Class A common stock equivalents also include Class A common stock issuable upon conversion of the convertible notes due in 2020 using the if-converted method through the date of their last conversion in December 2020.

Prior to the second half of 2020, we intended to settle the principal amount of our outstanding convertible senior notes in cash and therefore used the treasury stock method to calculate any potential dilutive effect of the conversion spread on diluted net income per share, if applicable.

Effective July 1, 2020, we can no longer assume cash settlement of the principal amount of these outstanding convertible notes, therefore share settlement is now presumed. On a prospective basis we have applied the if-converted method for calculating any potential dilutive effect of the conversion of the outstanding convertible notes on diluted net income per share, if applicable. The following table presents the maximum number of shares and conversion price per share of Class C capital stock for each of the Notes based on the aggregate principal amount outstanding as of March 31, 2021 (in thousands, except per share amounts):

Maturity Date	Shares	Conversion Price per Share
September 1, 2026	11,464	$	43.51
May 15, 2025	8,408	67.20
September 1, 2024	14,304	43.51
July 1, 2023	4,757	78.37

For the periods presented, the following table reconciles the denominators used in the basic and diluted net income (loss) per share calculations (in thousands):

	Three Months Ended March 31,
	2021	2020
Denominator for basic calculation	243,234	210,674
Effect of dilutive securities:
Option awards	12,437	—
Unvested restricted stock units	3,675	—
Denominator for dilutive calculation	259,346	210,674

For the periods presented, the following Class A common stock and Class C capital stock equivalents were excluded from the calculations of diluted net income (loss) per share because their effect would have been antidilutive (in thousands):

	Three Months Ended March 31,
	2021	2020
Weighted-average Class A common stock and Class C capital stock option awards outstanding	2,546	23,663
Weighted-average Class C capital stock restricted stock units outstanding	303	7,623
Class A common stock issuable upon conversion of the convertible notes maturing in 2020	—	407
Class C capital stock issuable upon conversion of the 2023 Notes, 2024 Notes, 2025 Notes and 2026 Notes	39,834	—
Total Class A common stock and Class C capital stock equivalents	42,683	31,693

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Interest Rate Lock Commitments

We have entered into IRLCs with prospective borrowers under our mortgage origination business whereby we commit to lend a certain loan amount under specific terms and at a specific interest rate to the borrower. These commitments are treated as derivatives and are carried at fair value. For additional information regarding our IRLCs, see Note 3 of our Notes to Condensed Consolidated Financial Statements of this Quarterly Report on Form 10-Q.

Lease Commitments

We have entered into various non-cancelable operating lease agreements for certain of our office space and equipment with original lease periods expiring between 2021 and 2030. For additional information regarding our lease agreements, see Note 13 in the Notes to the Consolidated Financial Statements in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

Purchase Commitments

Purchase commitments primarily include various non-cancelable agreements to purchase content related to our mobile applications and websites and certain cloud computing services as well as homes we are under contract to purchase through Zillow Offers but that have not closed as of the respective date. As of March 31, 2021, the value of homes under contract that have not closed was $511.3 million.

Letters of Credit

As of March 31, 2021, we have outstanding letters of credit of approximately $16.9 million, which secure our lease obligations in connection with certain of our office space operating leases.

Surety Bonds

In the course of business, we are required to provide financial commitments in the form of surety bonds to third parties as a guarantee of our performance on and our compliance with certain obligations. If we were to fail to perform or comply with these obligations, any draws upon surety bonds issued on our behalf would then trigger our payment obligation to the surety bond issuer. We have outstanding surety bonds issued for our benefit of approximately $10.4 million and $10.1 million, respectively, as of March 31, 2021 and December 31, 2020.

Legal Proceedings

We are involved in a number of legal proceedings concerning matters arising in connection with the conduct of our business activities, some of which are at preliminary stages and some of which seek an indeterminate amount of damages. We regularly evaluate the status of legal proceedings in which we are involved to assess whether a loss is probable or there is a reasonable possibility that a loss or additional loss may have been incurred to determine if accruals are appropriate. We further evaluate each legal proceeding to assess whether an estimate of possible loss or range of loss can be made if accruals are not appropriate. For certain cases described below, management is unable to provide a meaningful estimate of the possible loss or range of possible loss because, among other reasons, (i) the proceedings are in preliminary stages; (ii) specific damages have not been sought; (iii) damages sought are, in our view, unsupported and/or exaggerated; (iv) there is uncertainty as to the outcome of pending appeals or motions; (v) there are significant factual issues to be resolved; and/or (vi) there are novel legal issues or unsettled legal theories presented. For these cases, however, management does not believe, based on currently available information, that the outcomes of these proceedings will have a material effect on our financial position, results of operations or cash flow. For the matters discussed below, we have not recorded any material accruals as of March 31, 2021 or December 31, 2020.

In July 2015, VHT, Inc. (“VHT”) filed a complaint against us in the U.S. District Court for the Western District of Washington alleging copyright infringement of VHT’s images on the Zillow Digs site. In January 2016, VHT filed an amended complaint alleging copyright infringement of VHT’s images on the Zillow Digs site as well as the Zillow listing site. In December 2016, the court granted a motion for partial summary judgment that dismissed VHT’s claims with respect to the Zillow listing site. On February 9, 2017, a jury trial returned a verdict finding that the Company had infringed VHT’s copyrights in images displayed or saved to the Digs site. The jury awarded VHT $79,875 in actual damages and approximately $8.2 million in statutory damages. On June 20, 2017, the District Court granted certain of our post-trial motions, finding that VHT failed to present sufficient evidence to prove direct copyright infringement for a portion of the images, reducing the total damages to approximately $4.1 million. On March 15, 2019, after we filed an appeal with the Ninth Circuit Court of Appeals seeking review of the final judgment and certain prior rulings entered by the District Court, the Ninth Circuit Court of Appeals issued an opinion that, among other things, (i) affirmed the District Court’s grant of summary judgment in favor of Zillow on direct infringement of images on Zillow’s listing site, (ii) affirmed the district court’s grant in favor of Zillow of judgment notwithstanding the verdict on certain images that were displayed on the Zillow Digs site, (iii) remanded consideration of the issue whether VHT’s images on the Zillow Digs site were part of a compilation or individual photos, and (iv) vacated the jury’s finding of willful infringement. On October 7, 2019, the U.S. Supreme Court denied VHT’s petition for writ of certiorari seeking review of certain rulings by the Ninth Circuit Court of Appeals. On December 6, 2019, the Company filed a motion for summary judgment with the District Court seeking a ruling that VHT’s images are a compilation, or in the alternative, seeking a dismissal of the case based on a recent U.S. Supreme Court ruling. On May 8, 2020, the District Court denied the Company’s motion for summary judgment and granted VHT’s motion for summary judgment on the issue of whether the remaining photos were a compilation. On March 10, 2021, the District Court ordered a new trial relating to 2,700 images that the jury previously found that the Company had willfully infringed, and for which the court did not enter judgment, on the question of (i) whether the Company’s infringement was innocent, and (2) statutory damages. A trial date has been scheduled during the third quarter of 2021. We do not believe there is a reasonable possibility that a material loss will be incurred related to this lawsuit.

In August and September 2017, two purported class action lawsuits were filed against us and certain of our executive officers, alleging, among other things, violations of federal securities laws on behalf of a class of those who purchased our common stock between February 12, 2016 and August 8, 2017. One of those purported class actions, captioned Vargosko v. Zillow Group, Inc. et al, was brought in the U.S. District Court for the Central District of California. The other purported class action lawsuit, captioned Shotwell v. Zillow Group, Inc. et al, was brought in the U.S. District Court for the Western District of Washington. The complaints allege, among other things, that during the period between February 12, 2016 and August 8, 2017, we issued materially false and misleading statements regarding our business practices. The complaints seek to recover, among other things, alleged damages sustained by the purported class members as a result of the alleged misconduct. In November 2017, an amended complaint was filed against us and certain of our executive officers in the Shotwell v. Zillow Group purported class action lawsuit, extending the beginning of the class period to November 17, 2014. In January 2018, the Vargosko v. Zillow Group purported class action lawsuit was transferred to the U.S. District Court for the Western District of Washington and consolidated with the Shotwell v. Zillow Group purported class action lawsuit. In February 2018, the plaintiffs filed a consolidated amended complaint, and in April 2018, we filed our motion to dismiss the consolidated amended complaint. In October 2018, our motion to dismiss was granted without prejudice, and in November 2018, the plaintiffs filed a second consolidated amended complaint, which we moved to dismiss in December 2018. On April 19, 2019, our motion to dismiss the second consolidated amended complaint was denied, and we filed our answer to the second amended complaint on May 3, 2019. On October 11, 2019, plaintiffs filed a motion for class certification which was granted by the District Court on October 28, 2020. On February 17, 2021, the Ninth Circuit Court of Appeals denied our petition for review of that decision. We have denied the allegations of wrongdoing and intend to vigorously defend the claims in this lawsuit. We do not believe that there is a reasonable possibility that a material loss will be incurred related to this lawsuit.

In October and November 2017 and January and February 2018, four shareholder derivative lawsuits were filed in the U.S. District Court for the Western District of Washington and the Superior Court of the State of Washington, King County, against certain of our executive officers and directors seeking unspecified damages on behalf of the Company and certain other relief, such as reform to corporate governance practices. The plaintiffs in the derivative suits (in which the Company is a nominal defendant) allege, among other things, that the defendants breached their fiduciary duties in connection with oversight of the Company’s public statements and legal compliance, and as a result of the breach of such fiduciary duties, the Company was damaged, and defendants were unjustly enriched. Certain of the plaintiffs also allege, among other things, violations of Section 14(a) of the Securities Exchange Act of 1934 and waste of corporate assets. On February 5, 2018, the U.S. District Court for the Western District of Washington consolidated the two federal shareholder derivative lawsuits pending in that court. On February 16, 2018, the Superior Court of the State of Washington, King County, consolidated the two shareholder derivative lawsuits pending in that court. All four of the shareholder derivative lawsuits were stayed until our motion to dismiss the second consolidated amended complaint in the securities class action lawsuit discussed above was denied in April 2019. On July 8, 2019, the plaintiffs in the consolidated federal derivative lawsuit filed a consolidated shareholder derivative complaint, which we moved to dismiss on August 22, 2019. On February 28, 2020, our motion to dismiss the consolidated federal shareholder derivative complaint was denied. On May 18, 2020, we filed an answer in the consolidated federal derivative lawsuit. On August 24, 2020, we filed an answer in the consolidated state derivative matter. On February 16, 2021, the court in the consolidated state derivative matter stayed the action. On March 5, 2021, a new shareholder derivative lawsuit was filed in the U.S. District Court for the Western District of Washington against certain of our executive officers and directors seeking unspecified damages on behalf of the Company and certain other relief, such as reform to corporate governance practices, alleging, among other things, violations of federal securities laws. The defendants intend to deny the allegations of wrongdoing and vigorously defend the claims in this lawsuit. We do not believe that there is a reasonable possibility that a material loss will be incurred related to these derivative matters.

On September 17, 2019, International Business Machines Corporation (“IBM”) filed a complaint against us in the U.S. District Court for the Central District of California, alleging, among other things, that the Company has infringed and continues to willfully infringe seven patents held by IBM and seeks unspecified damages, including a request that the amount of compensatory damages be trebled, injunctive relief and costs and reasonable attorneys’ fees. On November 8, 2019, we filed a motion to transfer venue and/or to dismiss the complaint. On December 2, 2019, IBM filed an amended complaint, and on December 16, 2019, we filed a renewed motion to transfer venue and/or to dismiss the complaint. The Company’s motion to transfer venue to the U.S. District Court for the Western District of Washington was granted on May 28, 2020. We filed our answer with counterclaims in response to the amended complaint on June 11, 2020. On July 2, 2020, IBM filed a motion to dismiss our counterclaims. In response to IBM’s motion, on July 22, 2020, we filed an amended answer with counterclaims. On August 12, 2020, IBM filed its answer to our counterclaims. On September 18, 2020, we filed four inter partes review (“IPR”) petitions before the U.S. Patent and Trial Appeal Board (“PTAB”) seeking the Board’s review of the patentability with respect to three of the patents asserted by IBM in the lawsuit. On March 15, 2021, the PTAB instituted inter partes review proceedings with respect to two of the three patents for which we filed petitions. On March 22, 2021, the PTAB denied institution with respect to the last of the three patents for which we filed an IPR. On April 21, 2021, we filed a request for rehearing of the PTAB decision denying institution. On January 22, 2021, the court partially stayed the action with respect to all patents for which we filed an IPR and set forth a motion schedule. On March 8, 2021, IBM filed its second amended complaint. On March 25, 2021, we filed an amended motion for judgment on the pleadings. We deny the allegations of any wrongdoing and intend to vigorously defend the claims in the lawsuit. There is a reasonable possibility that a loss may be incurred related to these IBM complaints; however, the possible loss or range of loss is not estimable.

On July 21, 2020, IBM filed a second action against us in the U.S. District Court for the Western District of Washington, alleging, among other things that the Company has infringed and continues to willfully infringe five patents held by IBM and seeks unspecified damages. On September 14, 2020, we filed a motion to dismiss the complaint filed in the action, to which IBM responded by the filing of an amended complaint on November 5, 2020. On December 18, 2020, we filed a motion to dismiss IBM’s first amended complaint. On December 23, 2020, the Court issued a written order staying this case in full. We deny the allegations of any wrongdoing and intend to vigorously defend the claims in the lawsuit. There is a reasonable possibility that a loss may be incurred related to these IBM complaints; however, the possible loss or range of loss is not estimable.

In addition to the matters discussed above, from time to time, we are involved in litigation and claims that arise in the ordinary course of business. Although we cannot be certain of the outcome of any such litigation or claims, nor the amount of damages and exposure that we could incur, we currently believe that the final disposition of such matters will not have a material effect on our business, financial position, results of operations or cash flow. Regardless of the outcome, litigation can have an adverse impact on us because of defense and settlement costs, diversion of management resources and other factors.

Indemnifications

In the ordinary course of business, we enter into contractual arrangements under which we agree to provide indemnification of varying scope and terms to business partners and other parties with respect to certain matters, including, but not limited to, losses arising out of the breach of such agreements and out of intellectual property infringement claims made by third parties. In addition, we have agreements that indemnify certain issuers of surety bonds against losses that they may incur as a result of executing surety bonds on our behalf. For our indemnification arrangements, payment may be conditional on the other party making a claim pursuant to the procedures specified in the particular contract. Further, our obligations under these agreements may be limited in terms of time and/or amount, and in some instances, we may have recourse against third parties for certain payments. In addition, we have indemnification agreements with certain of our directors and executive officers that require us, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers. The terms of such obligations may vary.

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Employee Benefit Plan	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Employee Benefit Plan	Employee Benefit PlanWe have a defined contribution 401(k) retirement plan covering Zillow Group employees who have met certain eligibility requirements (the “Zillow Group 401(k) Plan”). Eligible employees may contribute pretax compensation up to a maximum amount allowable under the Internal Revenue Service limitations. Employee contributions and earnings thereon vest immediately. We currently match up to 4% of employee contributions under the Zillow Group 401(k) Plan. The total expense related to the Zillow Group 401(k) Plan was $7.7 million and $6.4 million, respectively, for the three months ended March 31, 2021 and 2020.

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Segment Information and Revenue

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Segment Information and Revenue

Segment Information and Revenue

We have three operating and reportable segments, which have been identified based on the way in which our chief operating decision-maker manages our business, makes operating decisions and evaluates operating performance. The chief executive officer acts as the chief operating decision-maker and reviews financial and operational information for the Homes, Internet, Media & Technology (“IMT”) and Mortgages segments.

The Homes segment includes the financial results from Zillow Group’s purchase and sale of homes directly through Zillow Offers and the financial results from title and escrow services through Zillow Closing Services. The IMT segment includes the financial results for the Premier Agent, rentals and new construction marketplaces, dotloop and display, as well as revenue from the sale of various other marketing and business products and services to real estate professionals. The Mortgages segment primarily includes financial results for mortgage originations and the sale of mortgages on the secondary market through Zillow Home Loans and advertising sold to mortgage lenders and other mortgage professionals.

Revenue and costs are directly attributed to our segments when possible. However, due to the integrated structure of our business, certain costs incurred by one segment may benefit the other segments. These costs primarily include headcount-related expenses, general and administrative expenses including executive, finance, accounting, legal, human resources, recruiting and facilities costs, product development and data acquisition costs, costs related to operating our mobile applications and websites, and marketing and advertising costs. These costs are allocated to each segment based on the estimated benefit each segment receives from such expenditures.

The chief executive officer reviews information about our revenue categories as well as statement of operations data inclusive of income (loss) before income taxes by segment. This information is included in the following table for the periods presented (in thousands):

	Three Months Ended March 31, 2021						Three Months Ended March 31, 2020
	Homes		IMT		Mortgages		Homes		IMT		Mortgages
Revenue:
Zillow Offers	$	700,974	$	—	$	—	$	769,112	$	—	$	—
Premier Agent	—		334,318		—		—		242,106		—
Other	3,178		112,010		—		761		88,560		—
Mortgages	—		—		67,960		—		—		25,282
Total revenue	704,152		446,328		67,960		769,873		330,666		25,282
Costs and expenses:
Cost of revenue	640,618		28,016		18,396		732,199		24,318		5,155
Sales and marketing	55,025		113,298		25,270		71,589		120,173		12,886
Technology and development	37,139		101,893		9,824		32,538		95,028		7,352
General and administrative	25,532		58,729		16,290		23,421		58,754		10,110
Impairment costs	—		—		—		—		73,900		2,900
Acquisition-related costs	—		817		—		—		—		—
Total costs and expenses (1)	758,314		302,753		69,780		859,747		372,173		38,403
Income (loss) from operations	(54,162)		143,575		(1,820)		(89,874)		(41,507)		(13,121)
Segment other income	—		—		1,732		—		—		202
Segment interest expense	(4,312)		—		(1,732)		(8,084)		—		(226)
Income (loss) before income taxes (2)	$	(58,474)	$	143,575	$	(1,820)	$	(97,958)	$	(41,507)	$	(13,145)

(1) The following table presents depreciation and amortization expense and share-based compensation expense for each of our segments for the periods presented (in thousands):

	Three Months Ended March 31, 2021						Three Months Ended March 31, 2020
	Homes		IMT		Mortgages		Homes		IMT		Mortgages
Depreciation and amortization expense	$	4,293	$	22,799	$	1,807	$	3,575	$	23,777	$	1,674
Share-based compensation expense	$	15,921	$	41,392	$	6,360	$	11,304	$	29,547	$	2,944

(2) The following table presents the reconciliation of total segment income (loss) before income taxes to consolidated income (loss) before income taxes for the periods presented (in thousands):

	Three Months Ended March 31,
	2021		2020
Total segment income (loss) before income taxes	$	83,281	$	(152,610)
Corporate interest expense	(33,511)		(29,282)
Corporate other income	707		9,391
Loss on extinguishment of debt	(1,403)		—
Consolidated income (loss) before income taxes	$	49,074	$	(172,501)

Certain corporate items are not directly attributable to any of our segments, including the loss on extinguishment of debt, interest income earned on our short-term investments included in other income and interest costs on our convertible senior notes included in interest expense.

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Subsequent Events

3 Months Ended

Mar. 31, 2021

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

Acquisition of ShowingTime.com, Inc.

As previously disclosed, in February 2021, we entered into a definitive agreement to acquire ShowingTime.com, Inc. (“ShowingTime”), a real estate showing software provider, for $500.0 million in cash, subject to certain adjustments, payable upon the closing of the acquisition. On April 19, 2021, each of Zillow Group and ShowingTime received a request from the U.S. Federal Trade Commission (the “FTC”) for additional information and documentary material (commonly referred to as a “Second Request”) pursuant to the Hart-Scott-Rodino Antitrust Improvements Act of 1976 (the “HSR Act”) in connection with our proposed acquisition of ShowingTime. The FTC’s Second Request extends the waiting period imposed under the HSR Act until 30 days after both Zillow Group and ShowingTime have substantially complied with the Second Request, unless the waiting period is terminated earlier by the FTC or voluntarily extended through an agreement among Zillow Group, ShowingTime and the FTC. We continue to cooperate with the FTC in its review of the proposed acquisition.

Amendment of Credit Facility Agreements

On April 7, 2021, certain wholly owned subsidiaries of Zillow Group amended and restated the credit agreement with Credit Suisse AG, Cayman Islands, in order to facilitate a titling trust structure. The credit facility will continue to be classified within current liabilities in our condensed consolidated balance sheets.

On April 14, 2021, certain wholly owned subsidiaries of Zillow Group amended and restated the credit agreement with Goldman Sachs Bank USA previously maturing on April 20, 2022 in order to facilitate a titling trust structure and extend the maturity date to October 21, 2022. The credit facility will continue to be classified within current liabilities in our condensed consolidated balance sheets.

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Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2021

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying condensed consolidated financial statements include Zillow Group, Inc. and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. These condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Accordingly, these interim condensed consolidated financial statements should be read in conjunction with the audited financial statements and accompanying notes included in Zillow Group, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2020, which was filed with the SEC on February 12, 2021. The condensed consolidated balance sheet as of December 31, 2020, included herein, was derived from the audited financial statements of Zillow Group, Inc. as of that date.

The unaudited condensed consolidated interim financial statements, in the opinion of management, reflect all adjustments, consisting only of normal recurring adjustments, necessary to present fairly our financial position as of March 31, 2021 and our results of operations, comprehensive income (loss), shareholders’ equity and cash flows for the three months ended March 31, 2021 and 2020. The results for the three months ended March 31, 2021 are not necessarily indicative of the results to be expected for the year ending December 31, 2021 or for any interim period or for any other future year.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and the related disclosures at the date of the financial statements, as well as the reported amounts of revenue and expenses during the periods presented. On an ongoing basis, we evaluate our estimates, including those related to the accounting for certain revenue offerings, the net realizable value of inventory, amortization period and recoverability of contract cost assets, website and software development costs, recoverability of long-lived assets and intangible assets, share-based compensation, income taxes, business combinations and the recoverability of goodwill, among others. To the extent there are material differences between these estimates, judgments or assumptions and actual results, our financial statements will be affected. The COVID-19 pandemic has introduced significant additional uncertainty with respect to estimates, judgments and assumptions, which may materially impact the estimates previously listed, among others.

Recently Adopted Accounting Standards and Recently Issued Accounting Standards Not Yet Adopted

Recently Adopted Accounting Standards

In December 2019, the Financial Accounting Standards Board (“FASB”) issued guidance which is intended to simplify the accounting for income taxes. It removes certain exceptions to the general principles and clarifies and amends existing guidance to improve consistent application. This guidance is effective for interim and annual periods beginning after December 15, 2020, and early adoption is permitted. We adopted this guidance on January 1, 2021. The method of adoption for this guidance varies based on the amendment, however the relevant amendments have been applied on a prospective basis. The adoption of this guidance did not have a material impact on our financial position, results of operations or cash flows.

Recently Issued Accounting Standards Not Yet Adopted

In August 2020, the FASB issued guidance which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts in an entity’s own equity. Among other changes, the guidance removes the liability and equity separation models for convertible instruments. Instead, entities will account for convertible debt instruments wholly as debt unless convertible instruments contain features that require bifurcation as a derivative or that result in substantial premiums accounted for as paid-in capital. The guidance also requires the application of the if-converted method to calculate the impact of convertible instruments on diluted earnings per share. The guidance is effective for fiscal years beginning after December 15, 2021, with early adoption permitted for fiscal years beginning after December 15, 2020, and can be adopted on either a retrospective or modified retrospective basis. We expect to adopt this guidance on January 1, 2022. Although we continue to evaluate the method of adoption and impact of this guidance on our financial position, results of operations and cash flows, upon adoption we expect this guidance to result in a reclassification of conversion feature balances from additional paid-in capital to debt and to decrease reported interest expense for our convertible senior notes.

In March 2020, the FASB issued guidance which provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions that reference the London Inter-Bank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued because of reference rate reform. This guidance is optional 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. This guidance is effective from March 12, 2020 through December 31, 2022. Entities may elect to adopt the amendments for contract modifications 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. We expect to apply some of the expedients and exceptions provided in this guidance to our credit facilities, warehouse line of credit and master repurchase agreements, all of which reference the one-month LIBOR in the applicable interest rate, as publication of the one-month LIBOR is expected to cease after June 30, 2023. We expect to amend our facility agreements prior to that date. As the goal of the reference rate reform transition is for it to be economically neutral to entities, we do not believe the adoption of this guidance will have a material impact on our financial position, results of operations or cash flows.

Fair Value Measurements

We applied the following methods and assumptions in estimating our fair value measurements:

Cash equivalents — The fair value measurement of money market funds is based on quoted market prices in active markets (Level 1). The fair value measurement of other cash equivalents is based on observable market-based inputs principally derived from or corroborated by observable market data (Level 2).

Short-term investments — The fair value measurement of our short-term investments is based on observable market-based inputs or inputs that are derived principally from or corroborated by observable market data by correlation or other means (Level 2).

Restricted cash — The carrying value of restricted cash approximates fair value due to the short period of time amounts borrowed on the credit facilities are outstanding and amounts are held in escrow (Level 1).

Mortgage loans held for sale — The fair value of mortgage loans held for sale is generally calculated by reference to quoted prices in secondary markets for commitments to sell mortgage loans with similar characteristics (Level 2).

Interest rate lock commitments — The fair value of interest rate lock commitments (“IRLCs”) is calculated by reference to quoted prices in secondary markets for commitments to sell mortgage loans with similar characteristics. Expired commitments are excluded from the fair value measurement. Since not all IRLCs will become closed loans, we adjust our fair value measurements for the estimated amount of IRLCs that will not close. This adjustment is effected through the pull-through rate, which represents the probability that an interest rate lock commitment will ultimately result in a closed loan (Level 3).

Forward contracts — The fair value of mandatory loan sales commitments and derivative instruments such as forward sales of mortgage-backed securities that are utilized as economic hedging instruments are calculated by reference to quoted prices for similar assets (Level 2).

Segment Reporting

We have three operating and reportable segments, which have been identified based on the way in which our chief operating decision-maker manages our business, makes operating decisions and evaluates operating performance. The chief executive officer acts as the chief operating decision-maker and reviews financial and operational information for the Homes, Internet, Media & Technology (“IMT”) and Mortgages segments.

The Homes segment includes the financial results from Zillow Group’s purchase and sale of homes directly through Zillow Offers and the financial results from title and escrow services through Zillow Closing Services. The IMT segment includes the financial results for the Premier Agent, rentals and new construction marketplaces, dotloop and display, as well as revenue from the sale of various other marketing and business products and services to real estate professionals. The Mortgages segment primarily includes financial results for mortgage originations and the sale of mortgages on the secondary market through Zillow Home Loans and advertising sold to mortgage lenders and other mortgage professionals.

Revenue and costs are directly attributed to our segments when possible. However, due to the integrated structure of our business, certain costs incurred by one segment may benefit the other segments. These costs primarily include headcount-related expenses, general and administrative expenses including executive, finance, accounting, legal, human resources, recruiting and facilities costs, product development and data acquisition costs, costs related to operating our mobile applications and websites, and marketing and advertising costs. These costs are allocated to each segment based on the estimated benefit each segment receives from such expenditures.

The chief executive officer reviews information about our revenue categories as well as statement of operations data inclusive of income (loss) before income taxes by segment.

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurement Inputs and Valuation Techniques

The following table presents the range and weighted-average pull-through rates used in determining the fair value of IRLCs as of the dates presented:

	March 31, 2021	December 31, 2020
Range	50% - 100%	47% - 100%
Weighted-average	81%	75%

Summary of Balances of Cash Equivalents and Investments

The following tables present the balances of assets and liabilities measured at fair value on a recurring basis, by level within the fair value hierarchy, as of the dates presented (in thousands):

	March 31, 2021
	Total		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	3,074,175	$	3,074,175	$	—	$	—
Short-term investments:
U. S. government agency securities	988,774		—		988,774		—
Treasury bills	298,984		—		298,984		—
Municipal securities	6,044		—		6,044		—
Certificates of deposit	249		—		249		—
Restricted cash	120,713		120,713		—		—
Mortgage origination-related:
Mortgage loans held for sale	274,319		—		274,319		—
IRLCs	5,002		—		—		5,002
Forward contracts - other current assets	4,946		—		4,946		—
Forward contracts - other current liabilities	(16)		—		(16)		—
Total	$	4,773,190	$	3,194,888	$	1,573,300	$	5,002

	December 31, 2020
	Total		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	1,486,384	$	1,486,384	$	—	$	—
Municipal securities	3,228		—		3,228		—
Short-term investments:
Treasury bills	1,163,813		—		1,163,813		—
U. S. government agency securities	1,037,577		—		1,037,577		—
Municipal securities	16,220		—		16,220		—
Certificates of deposit	498		—		498		—
Restricted cash	75,805		75,805		—		—
Mortgage origination-related:
Mortgage loans held for sale	330,758		—		330,758		—
IRLCs	12,342		—		—		12,342
Forward contracts - other current liabilities	(2,608)		—		(2,608)		—
Total	$	4,124,017	$	1,562,189	$	2,549,486	$	12,342

Schedule of Changes in IRLCs

The following table presents the changes in our IRLCs during the three months ended March 31, 2021 (in thousands):

	Three Months Ended March 31, 2021		Three Months Ended March 31, 2020
Balance, beginning of the period	$	12,342	$	937
Issuances	18,301		5,208
Transfers	(24,398)		(5,349)
Fair value changes recognized in earnings	(1,243)		1,429
Balance, end of period	$	5,002	$	2,225

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Cash and Cash Equivalents, Short-term Investments and Restricted Cash (Tables)

3 Months Ended

Mar. 31, 2021

Cash and Cash Equivalents [Abstract]

Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Market Value of Cash and Cash Equivalents and Available-for-Sale Investments

The following tables present the amortized cost, gross unrealized gains and losses and estimated fair market value of our cash and cash equivalents, short-term investments and restricted cash as of the dates presented (in thousands):

	March 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Market Value
Cash	$	327,587	$	—	$	—	$	327,587
Cash equivalents:
Money market funds	3,074,175		—		—		3,074,175
Short-term investments:
U. S. government agency securities	988,478		303		(7)		988,774
Treasury bills	298,953		31		—		298,984
Municipal securities	6,046		—		(2)		6,044
Certificates of deposit	249		—		—		249
Restricted cash	120,713		—		—		120,713
Total	$	4,816,201	$	334	$	(9)	$	4,816,526

	December 31, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Market Value
Cash	$	213,518	$	—	$	—	$	213,518
Cash equivalents:
Money market funds	1,486,384		—		—		1,486,384
Municipal securities	3,229		—		(1)		3,228
Short-term investments:
Treasury bills	1,163,748		65		—		1,163,813
U.S. government agency securities	1,037,572		57		(52)		1,037,577
Municipal securities	16,226		—		(6)		16,220
Certificates of deposit	498		—		—		498
Restricted cash	75,805		—		—		75,805
Total	$	3,996,980	$	122	$	(59)	$	3,997,043

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Inventory (Tables)

3 Months Ended

Mar. 31, 2021

Inventory Disclosure [Abstract]

Components of Net Inventory

The following table presents the components of inventory, net of applicable lower of cost or net realizable value adjustments, as of the dates presented (in thousands):

	March 31, 2021		December 31, 2020
Finished goods	$	341,887	$	339,372
Work-in-process	130,510		151,921
Inventory	$	472,397	$	491,293

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Property and Equipment, net (Tables)

3 Months Ended

Mar. 31, 2021

Property, Plant and Equipment [Abstract]

Detail of Property and Equipment

The following table presents the detail of property and equipment as of the dates presented (in thousands):

	March 31, 2021		December 31, 2020
Website development costs	$	110,971	$	95,466
Leasehold improvements	102,632		110,280
Office equipment, furniture and fixtures	34,561		39,607
Construction-in-progress	32,553		44,151
Computer equipment	20,209		20,433
Property and equipment	300,926		309,937
Less: accumulated amortization and depreciation	(110,692)		(113,785)
Property and equipment, net	$	190,234	$	196,152

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Intangible Assets, net (Tables)

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

The following tables present the detail of intangible assets as of the dates presented (in thousands):

	March 31, 2021
	Cost		Accumulated Amortization		Net
Trade names and trademarks	$	36,500	$	(5,105)	$	31,395
Software	33,764		(13,155)		20,609
Developed technology	86,064		(73,507)		12,557
Customer relationships	87,600		(76,429)		11,171
Intangibles-in-progress	9,886		—		9,886
Purchased content	49,565		(47,472)		2,093
Total	$	303,379	$	(215,668)	$	87,711

	December 31, 2020
	Cost		Accumulated Amortization		Net
Trade names and trademarks	$	36,500	$	(3,822)	$	32,678
Software	28,515		(11,483)		17,032
Developed technology	86,064		(70,270)		15,794
Customer relationships	87,600		(73,301)		14,299
Intangibles-in-progress	11,863		—		11,863
Purchased content	47,930		(44,829)		3,101
Total	$	298,472	$	(203,705)	$	94,767

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Debt (Tables)

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Schedule of Carrying Value of Debt

The following table presents the carrying values of Zillow Group’s debt as of the dates presented (in thousands):

	March 31, 2021		December 31, 2020
Homes segment
Credit facilities:
Goldman Sachs Bank USA	$	190,176	$	145,825
Citibank, N.A.	109,732		87,103
Credit Suisse AG, Cayman Islands	98,928		128,238
Total Homes segment debt	398,836		361,166
Mortgages segment
Repurchase agreements:
Credit Suisse AG, Cayman Islands	132,001		149,913
Citibank, N.A.	50,546		90,227
Warehouse line of credit:
Comerica Bank	80,792		68,903
Total Mortgages segment debt	263,339		309,043
Convertible senior notes
1.375% convertible senior notes due 2026	352,077		347,566
2.75% convertible senior notes due 2025	421,770		414,888
0.75% convertible senior notes due 2024	493,044		524,273
1.50% convertible senior notes due 2023	330,314		326,796
Total convertible senior notes	1,597,205		1,613,523
Total debt	$	2,259,380	$	2,283,732

Schedule of Revolving Credit Facilities and Lines of Credit

The following table summarizes certain details related to our credit facilities (in thousands, except interest rates):

Lender	Final Maturity Date	Maximum Borrowing Capacity		Weighted-Average Interest Rate
Goldman Sachs Bank USA	April 20, 2022	$	500,000	3.15	%
Citibank, N.A.	November 30, 2021	500,000		2.86	%
Credit Suisse AG, Cayman Islands	December 31, 2022	500,000		2.86	%
	Total	$	1,500,000

The following table summarizes certain details related to our repurchase agreements and warehouse line of credit (in thousands, except interest rates):

Lender	Maturity Date	Maximum Borrowing Capacity		Weighted-Average Interest Rate
Credit Suisse AG, Cayman Islands	March 18, 2022	$	300,000	2.50	%
Citibank, N.A.	October 26, 2021	100,000		1.86	%
Comerica Bank	June 26, 2021	100,000		3.01	%
	Total	$	500,000

Schedule of Convertible Senior Notes

The following tables summarize certain details related to our outstanding convertible senior notes as of the dates presented or for the periods ended (in thousands, except interest rates):

									March 31, 2021				December 31, 2020
Maturity Date	Aggregate Principal Amount		Stated Interest Rate		Effective Interest Rate		First Interest Payment Date	Semi-Annual Interest Payment Dates	Unamortized Debt Discount and Debt Issuance Costs		Fair Value		Unamortized Debt Discount and Debt Issuance Costs		Fair Value
September 1, 2026	$	498,800	1.375	%	8.10	%	March 1, 2020	March 1; September 1	$	146,723	$	1,476,837	$	152,434	$	1,508,675
May 15, 2025	565,000		2.75	%	10.32	%	November 15, 2020	May 15; November 15	143,230		1,172,674		150,112		1,168,855
September 1, 2024	622,382		0.75	%	7.69	%	March 1, 2020	March 1; September 1	129,338		1,854,113		148,727		2,023,280
July 1, 2023	372,825		1.50	%	6.99	%	January 1, 2019	January 1; July 1	42,511		611,522		46,954		633,039
Total	$	2,059,007							$	461,802	$	5,115,146	$	498,227	$	5,333,849

	Three Months Ended March 31, 2021								Three Months Ended March 31, 2020
Maturity Date	Contractual Coupon Interest		Amortization of Debt Discount		Amortization of Debt Issuance Costs		Interest Expense		Contractual Coupon Interest		Amortization of Debt Discount		Amortization of Debt Issuance Costs		Interest Expense
September 1, 2026	$	1,717	$	5,226	$	128	$	7,071	$	1,719	$	4,824	$	118	$	6,661
May 15, 2025	3,884		6,533		349		10,766		—		—		—		—
September 1, 2024	1,238		8,410		289		9,937		1,248		7,861		267		9,376
July 1, 2023	1,401		3,950		386		5,737		1,402		3,697		361		5,460
December 1, 2021	—		—		—		—		2,300		4,911		508		7,719
December 15, 2020	—		—		—		—		66		—		—		66
Total	$	8,240	$	24,119	$	1,152	$	33,511	$	6,735	$	21,293	$	1,254	$	29,282

The following table summarizes the conversion and redemption options with respect to the Notes:

Maturity Date	Early Conversion Date	Conversion Rate	Conversion Price		Optional Redemption Date
September 1, 2026	March 1, 2026	22.9830	$	43.51	September 5, 2023
May 15, 2025	November 15, 2024	14.8810	67.20		May 22, 2023
September 1, 2024	March 1, 2024	22.9830	43.51		September 5, 2022
July 1, 2023	April 1, 2023	12.7592	78.37		July 6, 2021

The following table summarizes certain details related to the capped call confirmations with respect to certain of the convertible senior notes:

Maturity Date	Initial Cap Price		Cap Price Premium
September 1, 2026	$	80.5750	150	%
September 1, 2024	72.5175		125	%
July 1, 2023	105.45		85	%
December 1, 2021	69.19		85	%

Each series of the Notes was convertible during the three months ended March 31, 2021, at the option of the holders. The following table summarizes the conversion activity for the Notes for the period presented (in thousands, except for share amounts):

	Three Months Ended March 31, 2021
	2023 Notes		2024 Notes		2026 Notes		Total
Aggregate principal amount converted	$	925	$	50,618	$	1,200	$	52,743
Shares of Class C capital stock issued upon conversion	11,789		1,163,352		27,579		1,202,720
Total fair value of consideration transferred (1)	$	1,643	$	153,925	$	4,204	$	159,772
Loss on extinguishment of debt:
Consideration allocated to the liability component (2)	$	841	$	41,267	$	883	$	42,991
Carrying value of the liability component, net of unamortized debt discount and debt issuance costs	818		39,927		843		41,588
Loss on extinguishment of debt	$	23	$	1,340	$	40	$	1,403
Consideration allocated to the equity component	$	802	$	112,658	$	3,321	$	116,781
(1) Total fair value of consideration transferred includes the value of shares transferred to note holders using the daily volume weighted-average price of our Class C capital stock on the conversion date and an immaterial amount of cash paid in lieu of fractional shares.
(2) Consideration allocated to the liability component is based on the fair value of the liability component immediately prior to settlement, which was calculated using a discounted cash flow analysis with a market interest rate of a similar liability that does not have an associated convertible feature.

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Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Schedule of Sale of Stock

The following table summarizes the activity pursuant to the equity distribution agreement for the period presented (in thousands, except share and per share amounts):

	Three Months Ended March 31, 2021
Shares of Class C capital stock issued	3,163,502
Weighted-average issuance price per share	$	174.0511
Gross proceeds (1)	$	550,611

(1) Net proceeds were $544.6 million after deducting $6.1 million of commissions and other offering expenses incurred.

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Share-Based Awards (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Summary of Option Award Activity

The following table summarizes option award activity for the three months ended March 31, 2021:

	Number of Shares Subject to Existing Options	Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2021	20,051,051	$	42.68	7.22	$	1,751,105
Granted	8,226,833	133.88
Exercised	(1,602,896)	38.15
Forfeited or cancelled	(373,388)	47.58
Outstanding at March 31, 2021	26,301,600	71.41		7.99	1,580,222
Vested and exercisable at March 31, 2021	9,411,270	39.23		6.05	851,494

Fair Value of Options Granted, Estimated at Date of Grant Using Black Scholes Merton Option Pricing Model

The fair value of options granted is estimated at the date of grant using the Black-Scholes-Merton option-pricing model, assuming no dividends and with the following assumptions for the periods presented:

	Three Months Ended March 31,
	2021	2020
Expected volatility	52%-55%	45%-48%
Expected dividend yield	—	—
Risk-free interest rate	0.57%-0.90%	0.87%-0.93%
Weighted-average expected life	4.50-5.75 years	5.00-5.50 years
Weighted-average fair value of options granted	$59.74	$20.75

Summary of Restricted Stock Units Activity

The following table summarizes activity for restricted stock units for the three months ended March 31, 2021:

	Restricted Stock Units	Weighted- Average Grant- Date Fair Value
Unvested outstanding at January 1, 2021	7,316,557	$	48.14
Granted	930,831	138.13
Vested	(813,471)	44.96
Forfeited	(162,972)	48.73
Unvested outstanding at March 31, 2021	7,270,945	60.01

Effects of Share Based Compensation in Consolidated Statements of Operations

The following table presents the effects of share-based compensation expense in our condensed consolidated statements of operations during the periods presented (in thousands):

	Three Months Ended March 31,
	2021		2020
Cost of revenue	$	2,386	$	1,173
Sales and marketing	9,887		6,993
Technology and development	26,393		18,917
General and administrative	25,007		16,712
Total	$	63,673	$	43,795

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Net Income (Loss) Per Share (Tables)

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Antidilutive Securities Excluded from Computation of Earnings Per Share

The following table presents the maximum number of shares and conversion price per share of Class C capital stock for each of the Notes based on the aggregate principal amount outstanding as of March 31, 2021 (in thousands, except per share amounts):

Maturity Date	Shares	Conversion Price per Share
September 1, 2026	11,464	$	43.51
May 15, 2025	8,408	67.20
September 1, 2024	14,304	43.51
July 1, 2023	4,757	78.37

For the periods presented, the following table reconciles the denominators used in the basic and diluted net income (loss) per share calculations (in thousands):

	Three Months Ended March 31,
	2021	2020
Denominator for basic calculation	243,234	210,674
Effect of dilutive securities:
Option awards	12,437	—
Unvested restricted stock units	3,675	—
Denominator for dilutive calculation	259,346	210,674

For the periods presented, the following Class A common stock and Class C capital stock equivalents were excluded from the calculations of diluted net income (loss) per share because their effect would have been antidilutive (in thousands):

	Three Months Ended March 31,
	2021	2020
Weighted-average Class A common stock and Class C capital stock option awards outstanding	2,546	23,663
Weighted-average Class C capital stock restricted stock units outstanding	303	7,623
Class A common stock issuable upon conversion of the convertible notes maturing in 2020	—	407
Class C capital stock issuable upon conversion of the 2023 Notes, 2024 Notes, 2025 Notes and 2026 Notes	39,834	—
Total Class A common stock and Class C capital stock equivalents	42,683	31,693

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Segment Information and Revenue (Tables)

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Revenue Categories

This information is included in the following table for the periods presented (in thousands):

	Three Months Ended March 31, 2021						Three Months Ended March 31, 2020
	Homes		IMT		Mortgages		Homes		IMT		Mortgages
Revenue:
Zillow Offers	$	700,974	$	—	$	—	$	769,112	$	—	$	—
Premier Agent	—		334,318		—		—		242,106		—
Other	3,178		112,010		—		761		88,560		—
Mortgages	—		—		67,960		—		—		25,282
Total revenue	704,152		446,328		67,960		769,873		330,666		25,282
Costs and expenses:
Cost of revenue	640,618		28,016		18,396		732,199		24,318		5,155
Sales and marketing	55,025		113,298		25,270		71,589		120,173		12,886
Technology and development	37,139		101,893		9,824		32,538		95,028		7,352
General and administrative	25,532		58,729		16,290		23,421		58,754		10,110
Impairment costs	—		—		—		—		73,900		2,900
Acquisition-related costs	—		817		—		—		—		—
Total costs and expenses (1)	758,314		302,753		69,780		859,747		372,173		38,403
Income (loss) from operations	(54,162)		143,575		(1,820)		(89,874)		(41,507)		(13,121)
Segment other income	—		—		1,732		—		—		202
Segment interest expense	(4,312)		—		(1,732)		(8,084)		—		(226)
Income (loss) before income taxes (2)	$	(58,474)	$	143,575	$	(1,820)	$	(97,958)	$	(41,507)	$	(13,145)

(1) The following table presents depreciation and amortization expense and share-based compensation expense for each of our segments for the periods presented (in thousands):

	Three Months Ended March 31, 2021						Three Months Ended March 31, 2020
	Homes		IMT		Mortgages		Homes		IMT		Mortgages
Depreciation and amortization expense	$	4,293	$	22,799	$	1,807	$	3,575	$	23,777	$	1,674
Share-based compensation expense	$	15,921	$	41,392	$	6,360	$	11,304	$	29,547	$	2,944

(2) The following table presents the reconciliation of total segment income (loss) before income taxes to consolidated income (loss) before income taxes for the periods presented (in thousands):

	Three Months Ended March 31,
	2021		2020
Total segment income (loss) before income taxes	$	83,281	$	(152,610)
Corporate interest expense	(33,511)		(29,282)
Corporate other income	707		9,391
Loss on extinguishment of debt	(1,403)		—
Consolidated income (loss) before income taxes	$	49,074	$	(172,501)

Reconciliation of Segment Gross Profit and Loss

The following table presents the reconciliation of total segment income (loss) before income taxes to consolidated income (loss) before income taxes for the periods presented (in thousands):

	Three Months Ended March 31,
	2021		2020
Total segment income (loss) before income taxes	$	83,281	$	(152,610)
Corporate interest expense	(33,511)		(29,282)
Corporate other income	707		9,391
Loss on extinguishment of debt	(1,403)		—
Consolidated income (loss) before income taxes	$	49,074	$	(172,501)

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Fair Value Measurements - Fair Value Measurement Inputs and Valuation Techniques (Details) - IRLCs - Not Designated as Hedging Instrument	Mar. 31, 2021	Dec. 31, 2020
Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value rates, IRLCs	0.50	0.47
Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value rates, IRLCs	1	1
Weighted-average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value rates, IRLCs	0.81	0.75

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Fair Value Measurements - Fair Value of Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	$ 120,713	$ 75,805
Mortgage loans held for sale	274,319	330,758
Fair Value, Net Asset (Liability), Total	4,773,190	4,124,017
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	120,713	75,805
Mortgage loans held for sale	0	0
Fair Value, Net Asset (Liability), Total	3,194,888	1,562,189
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	0	0
Mortgage loans held for sale	274,319	330,758
Fair Value, Net Asset (Liability), Total	1,573,300	2,549,486
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	0	0
Mortgage loans held for sale	0	0
Fair Value, Net Asset (Liability), Total	5,002	12,342
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	3,074,175	1,486,384
Money market funds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		1,486,384
Money market funds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Money market funds | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		3,228
Short-term investments	6,044	16,220
Municipal securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0
Short-term investments	0	0
Municipal securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		3,228
Short-term investments		16,220
Municipal securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0
Short-term investments	0	0
U. S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	988,774	1,037,577
U. S. government agency securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
U. S. government agency securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments		1,037,577
U. S. government agency securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Treasury bills
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	298,984	1,163,813
Treasury bills | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Treasury bills | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments		1,163,813
Treasury bills | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	249	498
Certificates of deposit | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Certificates of deposit | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments		498
Certificates of deposit | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
IRLCs | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	5,002	12,342
IRLCs | Level 1 | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
IRLCs | Level 2 | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
IRLCs | Level 3 | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	5,002	12,342
Forward contracts | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	4,946
Derivative liability	(16)	(2,608)
Forward contracts | Level 1 | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0
Derivative liability	0	0
Forward contracts | Level 2 | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	4,946
Derivative liability	(16)	(2,608)
Forward contracts | Level 3 | Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0
Derivative liability	$ 0	$ 0

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Fair Value Measurements - Schedule of Changes in IRLCs (Details) - IRLCs - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative Asset, Rollforward [Roll Forward]
Balance, beginning of the period	$ 12,342	$ 937
Issuances	18,301	5,208
Transfers	(24,398)	(5,349)
Fair value changes recognized in earnings	(1,243)	1,429
Balance, end of period	$ 5,002	$ 2,225

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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Mortgage Loans Held For Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount	$ 336.2	$ 378.1
IRLCs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount	$ 560.0	$ 652.1

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Cash and Cash Equivalents, Short-term Investments and Restricted Cash - Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Market Value of Cash and Cash Equivalents and Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	$ 3,401,762	$ 1,703,130
Short-term investments:
Gross Unrealized Gains	334	122
Gross Unrealized Losses	(9)	(59)
Restricted cash	120,713	75,805
Cash, cash equivalents, short-term investments, and restricted cash, amortized cost	4,816,201	3,996,980
Cash, cash equivalents, short-term investments, and restricted cash, estimated fair market value	4,816,526	3,997,043
U. S. government agency securities
Short-term investments:
Amortized Cost	988,478
Gross Unrealized Gains	303
Gross Unrealized Losses	(7)
Estimated Fair Market Value	988,774	1,037,577
Treasury bills
Short-term investments:
Amortized Cost	298,953	1,163,748
Gross Unrealized Gains	31	65
Gross Unrealized Losses	0	0
Estimated Fair Market Value	298,984	1,163,813
U.S. government agency securities
Short-term investments:
Amortized Cost		1,037,572
Gross Unrealized Gains		57
Gross Unrealized Losses		(52)
Estimated Fair Market Value		1,037,577
Municipal securities
Short-term investments:
Amortized Cost	6,046	16,226
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2)	(6)
Estimated Fair Market Value	6,044	16,220
Certificates of deposit
Short-term investments:
Amortized Cost	249	498
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Market Value	249	498
Cash
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	327,587	213,518
Money market funds
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	$ 3,074,175	1,486,384
Municipal securities
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents, at cost		3,229
Cash and cash equivalents, gross unrealized losses		(1)
Cash and cash equivalents		$ 3,228

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Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Finished goods	$ 341,887	$ 339,372
Work-in-process	130,510	151,921
Inventory	$ 472,397	$ 491,293

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Contract Balances (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Contract asset	$ 34.3		$ 20.8
Revenue recognized, recorded in deferred revenue as of prior period	$ 46.5	$ 36.0

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Contract Cost Assets (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Contract cost assets	$ 50,182,000		$ 50,719,000
Impairment of contract cost assets	0	$ 0
Capitalized contract cost, amortization	$ 10,130,000	$ 8,415,000

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Property and Equipment, net - Detail of Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment	$ 300,926	$ 309,937
Less: accumulated amortization and depreciation	(110,692)	(113,785)
Property and equipment, net	190,234	196,152
Website development costs
Property, Plant and Equipment [Line Items]
Property and equipment	110,971	95,466
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	102,632	110,280
Office equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment	34,561	39,607
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property and equipment	32,553	44,151
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 20,209	$ 20,433

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Property and Equipment, net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Property, Plant and Equipment [Line Items]
Amortization and depreciation expense related to property and equipment other than website development costs	$ 7.9	$ 11.8
Capitalization of website development costs	12.4	12.5
Amortization of website development costs and intangible assets included in technology and development	12.9	11.8
Technology and development | Software Development
Property, Plant and Equipment [Line Items]
Amortization of website development costs and intangible assets included in technology and development	$ 8.0	$ 5.4

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Equity Investment - Narrative (Detail) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Oct. 31, 2016	Mar. 31, 2021	Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]
Non-cash impairment charge				$ 0	$ 76,800
October 2016 Investment | Variable Interest Entity, Not Primary Beneficiary
Schedule of Equity Method Investments [Line Items]
Percentage of equity interest held	10.00%		10.00%
Equity investments			$ 10,000
Non-cash impairment charge		$ 5,300

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Intangible Assets, net - Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Cost	$ 303,379	$ 298,472
Accumulated Amortization	(215,668)	(203,705)
Net	87,711	94,767
Trade names and trademarks
Finite-Lived Intangible Assets [Line Items]
Cost	36,500	36,500
Accumulated Amortization	(5,105)	(3,822)
Net	31,395	32,678
Software
Finite-Lived Intangible Assets [Line Items]
Cost	33,764	28,515
Accumulated Amortization	(13,155)	(11,483)
Net	20,609	17,032
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	86,064	86,064
Accumulated Amortization	(73,507)	(70,270)
Net	12,557	15,794
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	87,600	87,600
Accumulated Amortization	(76,429)	(73,301)
Net	11,171	14,299
Intangibles-in-progress
Finite-Lived Intangible Assets [Line Items]
Cost	9,886	11,863
Accumulated Amortization	0	0
Net	9,886	11,863
Purchased content
Finite-Lived Intangible Assets [Line Items]
Cost	49,565	47,930
Accumulated Amortization	(47,472)	(44,829)
Net	$ 2,093	$ 3,101

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Intangible Assets, net - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Indefinite-lived Intangible Assets [Line Items]
Amortization of website development costs and intangible assets included in technology and development	$ 12,900,000	$ 11,800,000
Non-cash impairment charge	0	76,800,000
Finite-lived intangible assets, net	87,711,000		$ 94,767,000
Trade names and trademarks
Indefinite-lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	$ 31,395,000		$ 32,678,000
Trade names and trademarks | Trulia
Indefinite-lived Intangible Assets [Line Items]
Non-cash impairment charge		71,500,000
Indefinite-lived intangible asset		108,000,000.0
Fair value of the intangible asset		$ 36,500,000
Useful life			10 years

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Debt - Schedule of Carrying Value of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt	$ 2,259,380	$ 2,283,732
Convertible senior notes
Debt Instrument [Line Items]
Total convertible senior notes	1,597,205	1,613,523
Convertible senior notes | 2026 Notes
Debt Instrument [Line Items]
Total convertible senior notes	$ 352,077	347,566
Stated Interest Rate	1.375%
Convertible senior notes | 2.75% convertible senior notes due 2025
Debt Instrument [Line Items]
Total convertible senior notes	$ 421,770	414,888
Stated Interest Rate	2.75%
Convertible senior notes | 2024 Notes
Debt Instrument [Line Items]
Total convertible senior notes	$ 493,044	524,273
Stated Interest Rate	0.75%
Convertible senior notes | 2023 Notes
Debt Instrument [Line Items]
Total convertible senior notes	$ 330,314	326,796
Stated Interest Rate	1.50%
Mortgages segment
Debt Instrument [Line Items]
Warehouse line of credit	$ 263,339	309,043
Line of Credit | Homes segment
Debt Instrument [Line Items]
Short-term debt	398,836	361,166
Goldman Sachs Bank USA | Line of Credit | Homes segment
Debt Instrument [Line Items]
Short-term debt	190,176	145,825
Citibank, N.A. | Mortgages segment
Debt Instrument [Line Items]
Short-term debt	50,546	90,227
Citibank, N.A. | Line of Credit | Homes segment
Debt Instrument [Line Items]
Short-term debt	109,732	87,103
Credit Suisse AG, Cayman Islands | Mortgages segment
Debt Instrument [Line Items]
Short-term debt	132,001	149,913
Credit Suisse AG, Cayman Islands | Line of Credit | Homes segment
Debt Instrument [Line Items]
Short-term debt	98,928	128,238
Comerica Bank | Line of Credit | Mortgages segment
Debt Instrument [Line Items]
Warehouse line of credit	$ 80,792	$ 68,903

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Debt - Schedule of Credit Facilities (Details) - Homes segment - Line of Credit	Mar. 31, 2021 USD ($)
Debt Instrument [Line Items]
Maximum Borrowing Capacity	$ 1,500,000,000
Goldman Sachs Bank USA | Final Maturity Date, April 20, 2022
Debt Instrument [Line Items]
Maximum Borrowing Capacity	$ 500,000,000
Weighted-Average Interest Rate	3.15%
Citibank, N.A. | Final Maturity Date, November 30, 2021
Debt Instrument [Line Items]
Maximum Borrowing Capacity	$ 500,000,000
Weighted-Average Interest Rate	2.86%
Credit Suisse AG, Cayman Islands | Final Maturity Date, December 31, 2022
Debt Instrument [Line Items]
Maximum Borrowing Capacity	$ 500,000,000
Weighted-Average Interest Rate	2.86%

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Debt - Narrative (Detail)	3 Months Ended
	Mar. 31, 2021 USD ($) day	Mar. 19, 2021 USD ($)	Feb. 04, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Assets	$ 8,255,902,000			$ 7,486,560,000
Inventory	472,397,000			491,293,000
Restricted cash	120,713,000			75,805,000
Accounts receivable, net of allowance for doubtful accounts of $3,460 and $3,427 at March 31, 2021 and December 31, 2020, respectively	82,461,000			69,940,000
Liabilities	2,745,864,000			2,744,744,000
Borrowings under credit facilities	662,175,000			670,209,000
Accrued expenses and other current liabilities	121,692,000			94,487,000
Variable Interest Entity, Primary Beneficiary
Debt Instrument [Line Items]
Assets	573,600,000			551,200,000
Inventory	471,900,000			491,300,000
Restricted cash	83,200,000			53,000,000.0
Accounts receivable, net of allowance for doubtful accounts of $3,460 and $3,427 at March 31, 2021 and December 31, 2020, respectively	16,400,000			3,900,000
Liabilities	411,600,000			372,500,000
Borrowings under credit facilities	398,800,000			361,200,000
Accrued expenses and other current liabilities	$ 9,900,000			10,800,000
Convertible Senior Notes due 2023, 2024, 2025 and 2026 | Convertible senior notes
Debt Instrument [Line Items]
Debt instrument, convertible threshold trading days | day	20
Debt instrument, threshold consecutive trading days | day	30
Debt instrument, convertible threshold percentage	130.00%
Line of Credit | Homes segment
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,500,000,000
Short-term debt	398,836,000			361,166,000
Line of Credit | Mortgages segment
Debt Instrument [Line Items]
Maximum borrowing capacity	500,000,000
Comerica Bank | Line of Credit | Mortgages segment
Debt Instrument [Line Items]
Maximum borrowing capacity	100,000,000		$ 100,000,000.0
Citibank, N.A. | Mortgages segment
Debt Instrument [Line Items]
Short-term debt	50,546,000			90,227,000
Citibank, N.A. | Line of Credit | Homes segment
Debt Instrument [Line Items]
Short-term debt	109,732,000			87,103,000
Citibank, N.A. | Line of Credit | Mortgages segment
Debt Instrument [Line Items]
Maximum borrowing capacity	100,000,000
Repurchase agreement, committed amount		$ 25,000,000.0
Credit Suisse and Citibank, N.A | Mortgages segment
Debt Instrument [Line Items]
Short-term debt	$ 189,900,000			$ 240,100,000

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Debt - Schedule of Warehouse Lines of Credit (Details) - Line of Credit - Mortgages segment - USD ($)	Mar. 31, 2021	Mar. 19, 2021	Feb. 04, 2021
Debt Instrument [Line Items]
Maximum Borrowing Capacity	$ 500,000,000
Credit Suisse AG, Cayman Islands
Debt Instrument [Line Items]
Maximum Borrowing Capacity	$ 300,000,000	$ 300,000,000.0
Weighted-Average Interest Rate	2.50%
Citibank, N.A.
Debt Instrument [Line Items]
Maximum Borrowing Capacity	$ 100,000,000
Weighted-Average Interest Rate	1.86%
Comerica Bank
Debt Instrument [Line Items]
Maximum Borrowing Capacity	$ 100,000,000		$ 100,000,000.0
Weighted-Average Interest Rate	3.01%

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Debt - Schedule of Convertible Senior Notes (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Interest Expense	$ 39,555,000	$ 37,592,000
Convertible senior notes
Debt Instrument [Line Items]
Aggregate Principal Amount	2,059,007,000
Unamortized Debt Discount and Debt Issuance Costs	461,802,000		$ 498,227,000
Fair Value	5,115,146,000		5,333,849,000
Contractual Coupon Interest	8,240,000	6,735,000
Amortization of Debt Discount	24,119,000	21,293,000
Amortization of Debt Issuance Costs	1,152,000	1,254,000
Interest Expense	33,511,000	29,282,000
Convertible senior notes | 2026 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 498,800,000
Stated Interest Rate	1.375%
Effective Interest Rate	8.10%
Unamortized Debt Discount and Debt Issuance Costs	$ 146,723,000		152,434,000
Fair Value	1,476,837,000		1,508,675,000
Contractual Coupon Interest	1,717,000	1,719,000
Amortization of Debt Discount	5,226,000	4,824,000
Amortization of Debt Issuance Costs	128,000	118,000
Interest Expense	7,071,000	6,661,000
Convertible senior notes | 2.75% convertible senior notes due 2025
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 565,000,000
Stated Interest Rate	2.75%
Effective Interest Rate	10.32%
Unamortized Debt Discount and Debt Issuance Costs	$ 143,230,000		150,112,000
Fair Value	1,172,674,000		1,168,855,000
Contractual Coupon Interest	3,884,000	0
Amortization of Debt Discount	6,533,000	0
Amortization of Debt Issuance Costs	349,000	0
Interest Expense	10,766,000	0
Convertible senior notes | 2024 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 622,382,000
Stated Interest Rate	0.75%
Effective Interest Rate	7.69%
Unamortized Debt Discount and Debt Issuance Costs	$ 129,338,000		148,727,000
Fair Value	1,854,113,000		2,023,280,000
Contractual Coupon Interest	1,238,000	1,248,000
Amortization of Debt Discount	8,410,000	7,861,000
Amortization of Debt Issuance Costs	289,000	267,000
Interest Expense	9,937,000	9,376,000
Convertible senior notes | 2023 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 372,825,000
Stated Interest Rate	1.50%
Effective Interest Rate	6.99%
Unamortized Debt Discount and Debt Issuance Costs	$ 42,511,000		46,954,000
Fair Value	611,522,000		$ 633,039,000
Contractual Coupon Interest	1,401,000	1,402,000
Amortization of Debt Discount	3,950,000	3,697,000
Amortization of Debt Issuance Costs	386,000	361,000
Interest Expense	5,737,000	5,460,000
Convertible senior notes | 2.0% convertible senior notes due 2021
Debt Instrument [Line Items]
Contractual Coupon Interest	0	2,300,000
Amortization of Debt Discount	0	4,911,000
Amortization of Debt Issuance Costs	0	508,000
Interest Expense	0	7,719,000
Convertible senior notes | 2.75% convertible senior notes due 2020
Debt Instrument [Line Items]
Contractual Coupon Interest	0	66,000
Amortization of Debt Discount	0	0
Amortization of Debt Issuance Costs	0	0
Interest Expense	$ 0	$ 66,000

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Debt - Summary of Conversion and Redemption Options and Details Related to Capped Call Confirmations (Details) - Convertible senior notes	3 Months Ended
	Mar. 31, 2021 $ / shares
2026 Notes
Debt Instrument [Line Items]
Debt instrument, conversion rate shares	0.0229830
Conversion Price per Share (usd per share)	$ 43.51
Initial cap price (usd per share)	$ 80.5750
Cap Price Premium	150.00%
2.75% convertible senior notes due 2025
Debt Instrument [Line Items]
Debt instrument, conversion rate shares	0.0148810
Conversion Price per Share (usd per share)	$ 67.20
2024 Notes
Debt Instrument [Line Items]
Debt instrument, conversion rate shares	0.0229830
Conversion Price per Share (usd per share)	$ 43.51
Initial cap price (usd per share)	$ 72.5175
Cap Price Premium	125.00%
2023 Notes
Debt Instrument [Line Items]
Debt instrument, conversion rate shares	0.0127592
Conversion Price per Share (usd per share)	$ 78.37
Initial cap price (usd per share)	$ 105.45
Cap Price Premium	85.00%
2.0% convertible senior notes due 2021
Debt Instrument [Line Items]
Initial cap price (usd per share)	$ 69.19
Cap Price Premium	85.00%

XML

Debt - Summary of Convertible Debt (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt Instrument [Line Items]
Loss on extinguishment of debt	$ (1,403)	$ 0
Convertible senior notes
Debt Instrument [Line Items]
Aggregate principal amount converted	$ 52,743
Shares of Class C capital stock issued upon conversion (in shares)	1,202,720,000
Total fair value of consideration transferred	$ 159,772
Consideration allocated to liability component	42,991
Carrying value of the liability component, net of unamortized debt discount and debt issuance costs	41,588
Loss on extinguishment of debt	1,403
Consideration allocated to the equity component	116,781
2023 Notes | Convertible senior notes
Debt Instrument [Line Items]
Aggregate principal amount converted	$ 925
Shares of Class C capital stock issued upon conversion (in shares)	11,789,000
Total fair value of consideration transferred	$ 1,643
Consideration allocated to liability component	841
Carrying value of the liability component, net of unamortized debt discount and debt issuance costs	818
Loss on extinguishment of debt	23
Consideration allocated to the equity component	802
2024 Notes | Convertible senior notes
Debt Instrument [Line Items]
Aggregate principal amount converted	$ 50,618
Shares of Class C capital stock issued upon conversion (in shares)	1,163,352,000
Total fair value of consideration transferred	$ 153,925
Consideration allocated to liability component	41,267
Carrying value of the liability component, net of unamortized debt discount and debt issuance costs	39,927
Loss on extinguishment of debt	1,340
Consideration allocated to the equity component	112,658
2026 Notes | Convertible senior notes
Debt Instrument [Line Items]
Aggregate principal amount converted	$ 1,200
Shares of Class C capital stock issued upon conversion (in shares)	27,579,000
Total fair value of consideration transferred	$ 4,204
Consideration allocated to liability component	883
Carrying value of the liability component, net of unamortized debt discount and debt issuance costs	843
Loss on extinguishment of debt	40
Consideration allocated to the equity component	$ 3,321

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Income Taxes - Narrative (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Schedule Of Income Tax [Line Items]
Income tax benefit	$ (2,890,000)	$ (9,228,000)
Non-cash impairment charge	$ 0	76,800,000
Trulia
Schedule Of Income Tax [Line Items]
Income tax benefit		(9,700,000)
Trulia | Trade names and trademarks
Schedule Of Income Tax [Line Items]
Non-cash impairment charge		$ 71,500,000
Federal
Schedule Of Income Tax [Line Items]
Net operating loss carryforwards			$ 1,700,000,000
State
Schedule Of Income Tax [Line Items]
Net operating loss carryforwards			$ 53,200,000

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Shareholders' Equity - Additional Information (Detail)		3 Months Ended
	Feb. 17, 2021 USD ($)	Mar. 31, 2021 Vote shares	Dec. 31, 2020 shares
Class of Stock [Line Items]
Preferred stock, issued (in shares) | shares		0	0
Preferred stock, outstanding (in shares) | shares		0	0
Class A Common Stock
Class of Stock [Line Items]
Common stock holders voting right | Vote		1
Conversion of common stock conversion ratio		1
Class B Common Stock
Class of Stock [Line Items]
Common stock holders voting right | Vote		10
Class C Capital Stock | Equity Distribution Agreement
Class of Stock [Line Items]
Sale of stock, maximum consideration on transaction | $	$ 1,000,000,000.0

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Shareholders' Equity - Summary of Equity Distribution (Details) - Class C Capital Stock - Equity Distribution Agreement $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Class of Stock [Line Items]
Shares of Class C capital stock sold (in shares) | shares	3,163,502
Weighted-average issuance price per share (usd per share) | $ / shares	$ 174.0511
Gross proceeds	$ 550,611
Net proceeds from sale of stock	544,600
Payments for commissions	$ 6,100

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Share-Based Awards - Summary of Option Award (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Number of Shares Subject to Existing Options
Beginning Balance (in shares)	20,051,051
Granted (in shares)	8,226,833
Exercised (in shares)	(1,602,896)
Forfeited or cancelled (in shares)	(373,388)
Ending Balance (in shares)	26,301,600	20,051,051
Vested and exercisable (in shares)	9,411,270
Weighted- Average Exercise Price Per Share
Beginning Balance (usd per share)	$ 42.68
Granted (usd per share)	133.88
Exercised (usd per share)	38.15
Forfeited or cancelled (usd per share)	47.58
Ending Balance (usd per share)	71.41	$ 42.68
Vested and exercisable (usd per share)	$ 39.23
Weighted- Average Remaining Contractual Life (Years)
Weighted-Average Remaining Contractual Life, Outstanding	7 years 11 months 26 days	7 years 2 months 19 days
Weighted-Average Remaining Contractual Life, Vested and exercisable	6 years 18 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Outstanding	$ 1,580,222	$ 1,751,105
Aggregate Intrinsic Value, Vested and exercisable	$ 851,494

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Share-Based Awards - Fair Value of Options Granted, Estimated at Date of Grant Using Black Scholes Merton Option Pricing Model (Detail) - Option awards - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%
Weighted-average fair value of options granted (usd per share)	$ 59.74	$ 20.75
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	52.00%	45.00%
Risk-free interest rate	0.57%	0.87%
Weighted-average expected life	4 years 6 months	5 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	55.00%	48.00%
Risk-free interest rate	0.90%	0.93%
Weighted-average expected life	5 years 9 months	5 years 6 months

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Share-Based Awards - Additional Information (Details) $ in Millions	Mar. 31, 2021 USD ($)
Option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized cost of unvested share-based compensation awards	$ 638.0
Unvested restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost	$ 411.1

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Share-Based Awards - Summary of Restricted Stock Units Activity (Detail) - Unvested restricted stock units	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Restricted Stock Units
Beginning balance (in shares) | shares	7,316,557
Granted (in shares) | shares	930,831
Vested (in shares) | shares	(813,471)
Forfeited (in shares) | shares	(162,972)
Ending balance (in shares) | shares	7,270,945
Weighted- Average Grant- Date Fair Value
Unvested outstanding, beginning balance (usd per share) | $ / shares	$ 48.14
Granted (usd per share) | $ / shares	138.13
Vested (usd per share) | $ / shares	44.96
Forfeited (usd per share) | $ / shares	48.73
Unvested outstanding, ending balance (usd per share) | $ / shares	$ 60.01

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Share-Based Awards - Effects of Share Based Compensation in Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	$ 63,673	$ 43,795
Cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	2,386	1,173
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	9,887	6,993
Technology and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	26,393	18,917
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	$ 25,007	$ 16,712

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Net Income (Loss) Per Share - Maximum Number of Shares and Conversion Price (Details) - Convertible senior notes shares in Thousands	3 Months Ended
	Mar. 31, 2021 $ / shares shares
September 1, 2026
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion Spread (in shares) | shares	11,464
Conversion Price per Share (usd per share) | $ / shares	$ 43.51
May 15, 2025
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion Spread (in shares) | shares	8,408
Conversion Price per Share (usd per share) | $ / shares	$ 67.20
September 1, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion Spread (in shares) | shares	14,304
Conversion Price per Share (usd per share) | $ / shares	$ 43.51
July 1, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion Spread (in shares) | shares	4,757
Conversion Price per Share (usd per share) | $ / shares	$ 78.37

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Net Income (Loss) Per Share - Schedule of Denominators Used in Basic and Diluted Per Share Calculations (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Denominator for basic calculation (in shares)	243,234	210,674
Denominator for dilutive calculation (in shares)	259,346	210,674
Option awards
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive securities, share-based payment arrangements (in shares)	12,437	0
Unvested restricted stock units
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive securities, share-based payment arrangements (in shares)	3,675	0

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Net Income (Loss) Per Share - Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Class A Common Stock and Class C Capital Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total Class A common stock and Class C capital stock equivalents (in shares)	42,683	31,693
Class A Common Stock and Class C Capital Stock | Weighted-average | Option awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total Class A common stock and Class C capital stock equivalents (in shares)	2,546	23,663
Class A Common Stock and Class C Capital Stock | Weighted-average | Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total Class A common stock and Class C capital stock equivalents (in shares)	303	7,623
Class A Common Stock | Convertible notes maturing in 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total Class A common stock and Class C capital stock equivalents (in shares)	0	407
Class C Capital Stock | Convertible notes maturing in 2023, 2024, 2025 and 2026
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total Class A common stock and Class C capital stock equivalents (in shares)	39,834	0

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Commitments and Contingencies - Additional Information (Detail)	Mar. 10, 2021 image	Jun. 20, 2017 USD ($)	Feb. 09, 2017 USD ($)	Mar. 31, 2021 USD ($)	Mar. 15, 2021 patent	Dec. 31, 2020 USD ($)	Sep. 18, 2020 petition patent	Jul. 21, 2020 patent	Sep. 17, 2019 patent	Feb. 28, 2018 claim	Feb. 16, 2018 claim	Feb. 05, 2018 claim	Sep. 30, 2017 claim
Other Commitments [Line Items]
Outstanding letters of credit				$ 16,900,000
Outstanding surety bonds				10,400,000		$ 10,100,000
Number of infringed images found | image	2,700
Number of patents infringed | patent					2		3	5	7
Number of petitions filed | petition							4
VHT Vs Zillow Group Inc.
Other Commitments [Line Items]
Jury awarded damages		$ 4,100,000
VHT Vs Zillow Group Inc. | Actual Damages
Other Commitments [Line Items]
Jury awarded damages			$ 79,875
VHT Vs Zillow Group Inc. | Statutory Damages
Other Commitments [Line Items]
Jury awarded damages			$ 8,200,000
Class Action Lawsuits
Other Commitments [Line Items]
Number of pending claims | claim													2
Shareholder Derivative Lawsuits
Other Commitments [Line Items]
Number of pending claims | claim										4	2	2
Homes under contract to purchase that have not closed
Other Commitments [Line Items]
Value of homes under contract that have not closed				$ 511,300,000

XML

Employee Benefit Plan - Additional Information (Detail) - Zillow Merger - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Defined Contribution Plan Disclosure [Line Items]
Company's contribution based on employee contribution (up to)	4.00%
Company's expense related to its defined contribution 401(k) retirement plans	$ 7.7	$ 6.4

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Segment Information and Revenue - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2021 Segment
Segment Reporting [Abstract]
Number of reportable segments	3
Number of operating segments	3

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Segment Information and Revenue - Revenue Categories (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Revenue:
Total revenue		$ 1,218,440	$ 1,125,821
Costs and expenses:
Cost of revenue	[1]	687,030	761,672
Sales and marketing		193,593	204,648
Technology and development		148,856	134,918
General and administrative		100,551	92,285
Impairment costs		0	76,800
Acquisition-related costs		817	0
Total costs and expenses		1,130,847	1,270,323
Income (loss) from operations		87,593	(144,502)
Other income		2,439	9,593
Interest expense		(39,555)	(37,592)
Income (loss) before income taxes		49,074	(172,501)
Homes segment
Revenue:
Total revenue		704,152	769,873
Costs and expenses:
Cost of revenue	[1]	640,618	732,199
Sales and marketing		55,025	71,589
Technology and development		37,139	32,538
General and administrative		25,532	23,421
Impairment costs		0	0
Acquisition-related costs		0	0
Total costs and expenses		758,314	859,747
Income (loss) from operations		(54,162)	(89,874)
Other income		0	0
Interest expense		(4,312)	(8,084)
Income (loss) before income taxes		(58,474)	(97,958)
Homes segment | Zillow Offers
Revenue:
Total revenue		700,974	769,112
Homes segment | Premier Agent
Revenue:
Total revenue		0	0
Homes segment | Other
Revenue:
Total revenue		3,178	761
Homes segment | Mortgages
Revenue:
Total revenue		0	0
IMT
Revenue:
Total revenue		446,328	330,666
Costs and expenses:
Cost of revenue	[1]	28,016	24,318
Sales and marketing		113,298	120,173
Technology and development		101,893	95,028
General and administrative		58,729	58,754
Impairment costs		0	73,900
Acquisition-related costs		817	0
Total costs and expenses		302,753	372,173
Income (loss) from operations		143,575	(41,507)
Other income		0	0
Interest expense		0	0
Income (loss) before income taxes		143,575	(41,507)
IMT | Zillow Offers
Revenue:
Total revenue		0	0
IMT | Premier Agent
Revenue:
Total revenue		334,318	242,106
IMT | Other
Revenue:
Total revenue		112,010	88,560
IMT | Mortgages
Revenue:
Total revenue		0	0
Mortgages segment
Revenue:
Total revenue		67,960	25,282
Costs and expenses:
Cost of revenue	[1]	18,396	5,155
Sales and marketing		25,270	12,886
Technology and development		9,824	7,352
General and administrative		16,290	10,110
Impairment costs		0	2,900
Acquisition-related costs		0	0
Total costs and expenses		69,780	38,403
Income (loss) from operations		(1,820)	(13,121)
Other income		1,732	202
Interest expense		(1,732)	(226)
Income (loss) before income taxes		(1,820)	(13,145)
Mortgages segment | Zillow Offers
Revenue:
Total revenue		0	0
Mortgages segment | Premier Agent
Revenue:
Total revenue		0	0
Mortgages segment | Other
Revenue:
Total revenue		0	0
Mortgages segment | Mortgages
Revenue:
Total revenue		$ 67,960	$ 25,282

[1]  ____________________
(1) Amortization of website development costs and intangible assets included in technology and development

XML

Segment Information and Revenue - Depreciation and Amortization Expense and Share-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization expense	$ 28,899	$ 29,026
Share-based compensation expense	63,673	43,795
Homes segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization expense	4,293	3,575
Share-based compensation expense	15,921	11,304
IMT
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization expense	22,799	23,777
Share-based compensation expense	41,392	29,547
Mortgages segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization expense	1,807	1,674
Share-based compensation expense	$ 6,360	$ 2,944

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Segment Information and Revenue - Reconciliation of Segment Gross Profit and Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment income (loss) before income taxes	$ 49,074	$ (172,501)
Corporate interest expense	(39,555)	(37,592)
Corporate other income	2,439	9,593
Loss on extinguishment of debt	(1,403)	0
Consolidated income (loss) before income taxes	49,074	(172,501)
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Total segment income (loss) before income taxes	83,281	(152,610)
Consolidated income (loss) before income taxes	83,281	(152,610)
Corporate
Segment Reporting, Revenue Reconciling Item [Line Items]
Corporate interest expense	(33,511)	(29,282)
Corporate other income	$ 707	$ 9,391

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Subsequent Events - Narrative (Details) $ in Millions	1 Months Ended
	Feb. 28, 2021 USD ($)
ShowingTime.com, Inc.
Subsequent Event [Line Items]
Payments to Acquire Businesses, Gross	$ 500.0