10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_____________________________________________________

FORM 10-Q

_____________________________________________________

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

For the quarterly period ended September 30, 2018

☐ 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

@ZillowGroup

(Registrant’s telephone number, including area code)

 _____________________________________________________ 

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  x    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  x    No  ☐

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

Large accelerated filer	x	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  x

As of October 31, 2018, 57,986,928 shares of Class A common stock, 6,217,447 shares of Class B common stock, and 139,042,266 shares of Class C capital stock were outstanding.

ZILLOW GROUP, INC.

Quarterly Report on Form 10-Q

For the Three Months Ended September 30, 2018

TABLE OF CONTENTS

		Page
	PART I – FINANCIAL INFORMATION
Item 1.	Financial Statements (unaudited)	2
	Condensed Consolidated Balance Sheets	2
	Condensed Consolidated Statements of Operations	3
	Condensed Consolidated Statements of Comprehensive Income (Loss)	4
	Condensed Consolidated Statements of Cash Flows	5
	Notes to Condensed Consolidated Financial Statements	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	25
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	49
Item 4.	Controls and Procedures	50
	PART II – OTHER INFORMATION
Item 1.	Legal Proceedings	51
Item 1A.	Risk Factors	52
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	69
Item 6.	Exhibits	70
	Signatures	71

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 II, Item 1A (Risk Factors) of this report. 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.

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 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.

1

PART I – FINANCIAL INFORMATION

Item 1. Financial Statements (unaudited)

ZILLOW GROUP, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(in thousands, except share data, unaudited)

	September 30, 2018			December 31, 2017
Assets
Current assets:
Cash and cash equivalents	$	643,792		$	352,095
Short-term investments	999,241			410,444
Accounts receivable, net of allowance for doubtful accounts of $5,276 and $5,341 at September 30, 2018 and December 31, 2017, respectively	66,337			54,396
Inventory	43,257			—
Prepaid expenses and other current assets	38,904			24,590
Restricted cash	3,203			—
Total current assets	1,794,734			841,525
Contract cost assets	45,238			—
Property and equipment, net	124,281			112,271
Goodwill	1,931,076			1,931,076
Intangible assets, net	290,887			319,711
Other assets	16,241			25,934
Total assets	$	4,202,457		$	3,230,517
Liabilities and shareholders’ equity
Current liabilities:
Accounts payable	$	5,846		$	3,587
Accrued expenses and other current liabilities	58,533			61,373
Accrued compensation and benefits	25,612			19,109
Revolving credit facility	24,674			—
Deferred revenue	35,959			31,918
Deferred rent, current portion	2,566			2,400
Total current liabilities	153,190			118,387
Deferred rent, net of current portion	18,049			21,330
Long-term debt	690,338			385,416
Deferred tax liabilities and other long-term liabilities	21,861			44,561
Total liabilities	883,438			569,694
Commitments and contingencies (Note 17)
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; 57,965,662 and 56,629,103 shares issued and outstanding as of September 30, 2018 and December 31, 2017, respectively	6			6
Class B common stock, $0.0001 par value; 15,000,000 shares authorized; 6,217,447 shares issued and outstanding as of September 30, 2018 and December 31, 2017	1			1
Class C capital stock, $0.0001 par value; 600,000,000 shares authorized; 138,974,244 and 127,268,598 shares issued and outstanding as of September 30, 2018 and December 31, 2017, respectively	13			13
Additional paid-in capital	3,894,757			3,254,146
Accumulated other comprehensive loss	(1,661		)	(1,100		)
Accumulated deficit	(574,097		)	(592,243		)
Total shareholders’ equity	3,319,019			2,660,823
Total liabilities and shareholders’ equity	$	4,202,457		$	3,230,517

See accompanying notes to condensed consolidated financial statements.

2

ZILLOW GROUP, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share data, unaudited)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Revenue:
IMT	$	332,076		$	281,839		$	957,201		$	794,464
Homes	11,018			—			11,018			—
Total revenue	343,094			281,839			968,219			794,464
Cost of revenue (exclusive of amortization) (1):
IMT	26,386			22,152			75,832			62,644
Homes	10,286			—			10,286			—
Total cost of revenue	36,672			22,152			86,118			62,644
Sales and marketing	128,734			107,108			413,752			344,266
Technology and development	105,314			83,389			299,623			234,798
General and administrative	70,743			54,226			187,395			153,038
Impairment costs	10,000			—			10,000			—
Acquisition-related costs	1,405			218			2,064			366
Integration costs	523			—			523			—
Total costs and expenses	353,391			267,093			999,475			795,112
Income (loss) from operations	(10,297		)	14,746			(31,256		)	(648		)
Other income	7,773			1,407			13,308			3,970
Interest expense	(12,668		)	(6,906		)	(26,928		)	(20,526		)
Income (loss) before income taxes	(15,192		)	9,247			(44,876		)	(17,204		)
Income tax benefit (expense)	14,700			(41		)	22,700			(41		)
Net income (loss)	$	(492	)	$	9,206		$	(22,176	)	$	(17,245	)
Net income (loss) per share — basic and diluted	$	—		$	0.05		$	(0.11	)	$	(0.09	)
Weighted-average shares outstanding — basic	202,416			187,692			195,208			185,447
Weighted-average shares outstanding — diluted	202,416			196,425			195,208			185,447
____________________ (1) Amortization of website development costs and intangible assets included in technology and development	$	18,165		$	23,537		$	61,735		$	69,957

See accompanying notes to condensed consolidated financial statements.

3

ZILLOW GROUP, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(in thousands, unaudited)

	Three Months Ended September 30,					Nine Months Ended September 30,
	2018			2017		2018			2017
Net income (loss)	$	(492	)	$	9,206	$	(22,176	)	$	(17,245	)
Other comprehensive income (loss):
Unrealized gains (losses) on investments	(428		)	99		(537		)	(103		)
Currency translation adjustments	42			—		(24		)	—
Total other comprehensive income (loss)	(386		)	99		(561		)	(103		)
Comprehensive income (loss)	$	(878	)	$	9,305	$	(22,737	)	$	(17,348	)

See accompanying notes to condensed consolidated financial statements.

4

ZILLOW GROUP, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands, unaudited)

	Nine Months Ended September 30,
	2018			2017
Operating activities
Net loss	$	(22,176	)	$	(17,245	)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	76,301			81,576
Share-based compensation expense	111,366			84,162
Amortization of contract cost assets	27,227			—
Amortization of discount and issuance costs on 2021 and 2023 Notes	17,990			13,391
Impairment costs	10,000			—
Deferred income taxes	(22,700		)	—
Loss on disposal of property and equipment	3,129			4,085
Bad debt expense	1,053			5,861
Deferred rent	(3,116		)	3,072
Amortization (accretion) of bond premium (discount)	(2,172		)	451
Changes in operating assets and liabilities:
Accounts receivable	(12,994		)	(19,272		)
Inventory	(43,257		)	—
Prepaid expenses and other assets	(15,012		)	4,434
Contract cost assets	(32,143		)	—
Accounts payable	2,254			224
Accrued expenses and other current liabilities	(3,751		)	13,174
Accrued compensation and benefits	6,503			1,194
Deferred revenue	4,041			1,775
Other long-term liabilities	—			41
Net cash provided by operating activities	102,543			176,923
Investing activities
Proceeds from maturities of investments	261,675			204,520
Purchases of investments	(848,838		)	(303,241		)
Purchases of property and equipment	(44,482		)	(51,580		)
Purchases of intangible assets	(8,179		)	(9,377		)
Purchase of equity investment	—			(10,000		)
Proceeds from divestiture of a business	—			579
Cash paid for acquisition, net	(2,000		)	(11,147		)
Net cash used in investing activities	(641,824		)	(180,246		)
Financing activities
Proceeds from issuance of 2023 Notes, net of issuance costs	364,020			—
Premiums paid for Capped Call Confirmations	(29,414		)	—
Proceeds from issuance of Class C Capital Stock, net of issuance costs	360,345			—
Proceeds from borrowing on revolving credit facility	24,674			—
Proceeds from exercise of stock options	114,623			80,010
Value of equity awards withheld for tax liability	(67		)	(337		)
Net cash provided by financing activities	834,181			79,673
Net increase in cash, cash equivalents and restricted cash during period	294,900			76,350
Cash, cash equivalents and restricted cash at beginning of period	352,095			243,592
Cash, cash equivalents and restricted cash at end of period	$	646,995		$	319,942
Supplemental disclosures of cash flow information
Cash paid for interest	$	4,800		$	4,458
Noncash transactions:
Capitalized share-based compensation	$	6,674		$	8,915
Write-off of fully depreciated property and equipment	$	18,687		$	12,685
Write-off of fully amortized intangible assets	$	10,797		$	5,454

See accompanying notes to condensed consolidated financial statements.

5

ZILLOW GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

Note 1. Organization and Description of Business

Zillow Group, Inc. operates the largest portfolio of real estate and home-related brands on mobile and the web which focus on all stages of the home lifecycle: renting, buying, selling and financing. Zillow Group is committed to empowering consumers with unparalleled data, inspiration and knowledge around homes, and connecting them with great real estate professionals. The Zillow Group portfolio of consumer brands includes real estate and rental marketplaces Zillow, Trulia, StreetEasy, HotPads, Naked Apartments, RealEstate.com and Out East. In addition, Zillow Group provides a comprehensive suite of marketing software and technology solutions to help real estate professionals maximize business opportunities and connect with millions of consumers. Beginning in April of 2018, Zillow Offers provides homeowners in certain metropolitan areas with the opportunity to receive offers to purchase their home from Zillow. When Zillow buys a home, it makes certain repairs and updates and lists the home for resale on the open market. We also own and operate a number of business brands for real estate, rental and mortgage professionals, including 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”). Upon the closing of the Trulia acquisition in February 2015, each of Zillow, Inc. and Trulia became wholly owned subsidiaries of Zillow Group.

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: rates of revenue growth; 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 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; our ability to successfully integrate and realize the benefits of our past or future strategic acquisitions or investments; 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, 2017, which was filed with the SEC on February 15, 2018. The condensed consolidated balance sheet as of December 31, 2017, 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 September 30, 2018, our results of operations and comprehensive income (loss) for the three and nine month periods ended September 30, 2018 and 2017, and our cash flows for the nine month periods ended September 30, 2018 and 2017. The results of the three and nine month periods ended September 30, 2018 are not necessarily indicative of the results to be expected for the year ending December 31, 2018 or for any interim period or for any other future year.

6

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 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 with definite lives, share-based compensation, income taxes, business combinations, and the recoverability of goodwill and indefinite-lived intangible assets, among others. To the extent there are material differences between these estimates, judgments, or assumptions and actual results, our financial statements will be affected.

Recently Adopted Accounting Standards

In May 2014, the Financial Accounting Standards Board (“FASB”) issued guidance on revenue from contracts with customers. The guidance states that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those products or services. It also states that an entity should recognize as an asset the incremental costs of obtaining a contract that the entity expects to recover and amortize the costs consistent with the transfer to the customer of the products or services to which the asset relates. The guidance requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. We adopted this guidance effective January 1, 2018 using the modified retrospective transition approach applied to all contracts at the date of initial application. We recorded an adjustment of $40.3 million to decrease accumulated deficit as of January 1, 2018 related to the accounting for the cost of sales commissions, primarily related to sales commissions for our Premier Agent and Premier Broker advertising products. Historically, we expensed these sales commission costs as incurred, but under the new guidance, the cost of certain sales commissions is recorded as a contract cost asset and recognized as an operating expense over the period that we expect to recover the costs.

The amount by which each financial statement line item is affected by the application of this guidance for the three months ended September 30, 2018 is as follows (in thousands, except per share data):

	New Guidance			Prior Guidance			Change
Condensed Consolidated Statement of Operations:
Sales and marketing	$	128,734		$	130,588		$	(1,854	)
Total costs and expenses	353,391			355,245			(1,854		)
Loss from operations	(10,297		)	(12,151		)	1,854
Loss before income taxes	(15,192		)	(17,046		)	1,854
Income tax benefit	14,700			14,992			(292		)
Net loss	(492		)	(2,054		)	1,562
Net loss per share — basic and diluted	—			(0.01		)	0.01

7

The amount by which each financial statement line item is affected by the application of this guidance as of and for the nine months ended September 30, 2018 is as follows (in thousands, except per share data):

	New Guidance			Prior Guidance			Change
Condensed Consolidated Statement of Operations:
Sales and marketing	$	413,752		$	418,668		$	(4,916	)
Total costs and expenses	999,475			1,004,391			(4,916		)
Loss from operations	(31,256		)	(36,172		)	4,916
Loss before income taxes	(44,876		)	(49,792		)	4,916
Income tax benefit	22,700			23,892			(1,192		)
Net loss	(22,176		)	(25,900		)	3,724
Net loss per share — basic and diluted	(0.11		)	(0.13		)	0.02
Condensed Consolidated Balance Sheet:
Contract cost assets	45,238			—			45,238
Total assets	4,202,457			4,157,219			45,238
Deferred tax liabilities and other long-term liabilities	21,861			20,669			1,192
Total liabilities	883,438			882,246			1,192
Accumulated deficit	(574,097		)	(619,335		)	45,238
Total shareholders’ equity	3,319,019			3,282,422			36,597
Total liabilities and shareholders’ equity	4,202,457			4,157,219			45,238

Recently Issued Accounting Standards Not Yet Adopted

In August 2018, the FASB issued guidance related to a customer’s accounting for implementation costs incurred in hosting arrangements. The guidance aligns the requirements for capitalizing implementation costs incurred in cloud computing arrangements with the requirements for capitalizing costs to develop or obtain internal-use software. This guidance is effective for interim and annual reporting periods beginning after December 15, 2019, and early adoption is permitted. This guidance may be applied either retrospectively or prospectively. We expect to adopt this guidance on January 1, 2020. We have not yet determined the impact the adoption of this guidance will have on our financial position, results of operations or cash flows.

In August 2018, the FASB issued guidance related to disclosure requirements for fair value measurements. This guidance removes, modifies and adds disclosures related to fair value measurements. This guidance is effective for interim and annual periods beginning after December 15, 2019, and early adoption is permitted. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim and annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. We expect to adopt this guidance on January 1, 2020. We have not yet determined the impact the adoption of this guidance will have on our financial statement disclosures.

In June 2018, the FASB issued guidance related to contributions received and made. This guidance assists entities with evaluating whether a transfer of assets is considered a contribution or an exchange transaction. This guidance is effective for interim and annual reporting periods beginning after June 15, 2018 for contributions received and after December 15, 2018 for contributions made, and early adoption is permitted. The guidance should be applied on a modified prospective basis, though retrospective application is permitted. We expect to adopt this guidance on January 1, 2019. The adoption of this guidance is not expected to have a material impact on our financial position, results of operations or cash flows.

In February 2018, the FASB issued guidance on income tax accounting related to the Tax Act. This guidance permits a reclassification from accumulated other comprehensive income (loss) to accumulated deficit for the adjustment of deferred taxes due to the reduction of the historical corporate income tax rate to the newly enacted corporate income tax rate under the Tax Act. It also requires certain disclosures regarding these reclassifications. The guidance is effective for interim and annual reporting periods beginning after December 15, 2018, and early adoption is permitted. This guidance must be applied either on a prospective basis in the period of adoption or retrospectively to each period in which the effect of the change in the corporate income tax rate is recognized. We expect to adopt this guidance on January 1, 2019. The adoption of this guidance is not expected to have a material impact on our financial position, results of operations or cash flows.

8

In March 2017, the FASB issued guidance related to the premium amortization on purchased callable debt securities. This guidance shortens the amortization period for certain callable debt securities purchased at a premium by requiring that the premium be amortized to the earliest call date. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, and early adoption is permitted. This guidance must be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. We expect to adopt this guidance on January 1, 2019. The adoption of this guidance is not expected to have a material impact on our financial position, results of operations or cash flows.

In June 2016, the FASB issued guidance on the measurement of credit losses on financial instruments. This guidance requires the use of an expected loss impairment model for instruments measured at amortized cost. For available-for-sale debt securities, an entity is required to recognize credit losses through an allowance for credit losses rather than as a write-down. This guidance is effective for interim and annual reporting periods beginning after December 15, 2019, and early adoption is permitted for interim and annual reporting periods beginning after December 15, 2018. The adoption of this guidance requires a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. We expect to adopt this guidance on January 1, 2020. We have not yet determined the impact the adoption of this guidance will have on our financial position, results of operations or cash flows.

In February 2016, the FASB issued guidance on leases. This guidance requires the recognition of a right-of-use asset and lease liability on the balance sheet for all leases. This guidance also requires more detailed disclosures to enable users of financial statements to understand the amount, timing, and uncertainty of cash flows arising from leases. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018. In July 2018, the FASB issued certain targeted improvements to the accounting and disclosure requirements for leases, including an additional optional transition method that allows entities to initially apply the new standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption without restating prior periods. We will adopt this guidance on January 1, 2019 using the optional transition method. Under this approach, we will not restate the prior financial statements presented. As we progress through our implementation of this guidance, we continue to expect a significant impact on our financial position upon adoption, primarily due to our office space operating leases, as we will be required to recognize lease assets and lease liabilities on our condensed consolidated balance sheet. As our leases do not provide an implicit rate, we plan to use our incremental borrowing rate based on information available at the commencement date to determine the present value of future payments. We continue to evaluate the incremental borrowing rate, changes to our internal control structure, accounting policies and disclosures. We continue to assess the impact the adoption will have on our results of operations and cash flows.

Note 3. Fair Value Measurements

Accounting standards define fair value as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market in an orderly transaction between market participants on the measurement date. The standards also establish a fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value:

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

• Level 2—Assets and liabilities valued based on observable market data for similar instruments, such as quoted prices for similar assets or liabilities.

• Level 3—Unobservable inputs that are supported by little or no market activity; instruments valued based on the best available data, some of which is internally developed, and considers risk premiums that a market participant would require.

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. The fair value measurement of corporate notes and bonds, commercial paper, U.S. government agency securities and certificates of deposit 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.

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.

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Restricted cash — Restricted cash consists of cash received from the resale of homes through Zillow Offers which is used to repay amounts borrowed on the Revolving Credit Facility (see Note 12) as well as certain reserves we are required to maintain pursuant to the Revolving Credit Facility. The carrying value of restricted cash approximates fair value due to the short period of time amounts borrowed on the Revolving Credit Facility are outstanding.

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

	September 30, 2018
	Total		Level 1		Level 2
Cash equivalents:
Money market funds	$	543,703	$	543,703	$	—
Commercial paper	3,490		—		3,490
Certificates of deposit	249		—		249
Short-term investments:
U.S. government agency securities	717,927		—		717,927
Corporate notes and bonds	121,875		—		121,875
Commercial paper	92,674		—		92,674
Municipal securities	43,154		—		43,154
Foreign government securities	17,905		—		17,905
Certificates of deposit	5,706		—		5,706
Total	$	1,546,683	$	543,703	$	1,002,980

	December 31, 2017
	Total		Level 1		Level 2
Cash equivalents:
Money market funds	$	233,508	$	233,508	$	—
Corporate notes and bonds	6,199		—		6,199
Commercial paper	3,987		—		3,987
U.S. government agency securities	1,748		—		1,748
Certificates of deposit	249		—		249
Short-term investments:
U.S. government agency securities	298,758		—		298,758
Corporate notes and bonds	44,607		—		44,607
Commercial paper	39,325		—		39,325
Municipal securities	11,459		—		11,459
Certificates of deposit	10,297		—		10,297
Foreign government securities	5,998		—		5,998
Total	$	656,135	$	233,508	$	422,627

See Note 12 for the carrying amount and estimated fair value of the Company’s Convertible Senior Notes due in 2023, Convertible Senior Notes due in 2021 and Trulia’s Convertible Senior Notes due in 2020.

We did not have any Level 3 assets as of September 30, 2018 or December 31, 2017. There were no liabilities measured at fair value on a recurring basis as of September 30, 2018 or December 31, 2017.

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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, available-for-sale investments and restricted cash as of the dates presented (in thousands):

	September 30, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	96,350	$	—	$	—		$	96,350
Cash equivalents:
Money market funds	543,703		—		—			543,703
Commercial paper	3,490		—		—			3,490
Certificates of deposit	249		—		—			249
Short-term investments:
U.S. government agency securities	719,380		—		(1,453		)	717,927
Corporate notes and bonds	121,987		1		(113		)	121,875
Commercial paper	92,674		—		—			92,674
Municipal securities	43,237		—		(83		)	43,154
Foreign government securities	17,940		—		(35		)	17,905
Certificates of deposit	5,706		1		(1		)	5,706
Restricted cash	3,203		—		—			3,203
Total	$	1,647,919	$	2	$	(1,685	)	$	1,646,236

	December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	106,404	$	—	$	—		$	106,404
Cash equivalents:
Money market funds	233,508		—		—			233,508
Corporate notes and bonds	6,200		—		(1		)	6,199
Commercial paper	3,987		—		—			3,987
U.S. government agency securities	1,748		—		—			1,748
Certificates of deposit	249		—		—			249
Short-term investments:
U.S. government agency securities	299,814		—		(1,056		)	298,758
Corporate notes and bonds	44,661		1		(55		)	44,607
Commercial paper	39,325		—		—			39,325
Municipal securities	11,494		—		(35		)	11,459
Certificates of deposit	10,296		2		(1		)	10,297
Foreign government securities	6,000		—		(2		)	5,998
Total	$	763,686	$	3	$	(1,150	)	$	762,539

The following table presents available-for-sale investments by contractual maturity date as of September 30, 2018 (in thousands):

	Amortized Cost		Estimated Fair Market Value
Due in one year or less	$	846,217	$	844,993
Due after one year through two years	154,707		154,248
Total	$	1,000,924	$	999,241

Note 5. Accounts Receivable, net

The opening balance of accounts receivable, net was $54.4 million as of January 1, 2018.

The following table presents the changes in the allowance for doubtful accounts (in thousands):

Balance as of January 1, 2018	$	5,341
Bad debt expense	1,053
Less: write-offs, net of recoveries and other adjustments	(1,118		)
Balance as of September 30, 2018	$	5,276

Note 6. Inventory

The components of inventory, net of applicable lower of cost or net realizable value write-downs, were as follows (in thousands):

	September 30, 2018		December 31, 2017
Work-in-progress	$	16,010	$	—
Finished goods	27,247		—
Inventory	$	43,257	$	—

Note 7. Contract Cost Assets

As of September 30, 2018, we had $45.2 million of contract cost assets. During the three and nine month periods ended September 30, 2018, we recorded no impairment losses. During the three and nine month periods ended September 30, 2018, we recorded $8.9 million and $27.2 million, respectively, of amortization expense related to contract cost assets.

Note 8. Property and Equipment, net

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

	September 30, 2018			December 31, 2017
Website development costs	$	147,416		$	130,072
Leasehold improvements	58,354			47,321
Computer equipment	30,896			30,071
Construction-in-progress	26,150			28,150
Office equipment, furniture and fixtures	26,221			22,887
Property and equipment	289,037			258,501
Less: accumulated amortization and depreciation	(164,756		)	(146,230		)
Property and equipment, net	$	124,281		$	112,271

We recorded depreciation expense related to property and equipment (other than website development costs) of $5.1 million and $3.8 million, respectively, during the three months ended September 30, 2018 and 2017, and $14.2 million and $11.5 million, respectively, during the nine months ended September 30, 2018 and 2017.

We capitalized $8.0 million and $13.4 million, respectively, in website development costs during the three months ended September 30, 2018 and 2017, and $26.6 million and $39.8 million, respectively, during the nine months ended September 30, 2018 and 2017. Amortization expense for website development costs included in technology and development expenses was $6.2 million and $10.1 million, respectively, during the three months ended September 30, 2018 and 2017, and $24.2 million and $30.0 million, respectively, during the nine months ended September 30, 2018 and 2017.

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Note 9. Equity Investments

In June 2017, we purchased an equity interest in a privately held corporation for approximately $10.0 million.

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. The entity is financed through its business operations. We are not the primary beneficiary of the entity, as we do not direct the activities that most significantly impact the entity’s economic performance. Therefore, we do not consolidate the entity. Our maximum exposure to loss is $10.0 million, the carrying amount of the investment as of September 30, 2018.

These investments are equity securities without readily determinable fair values which we account for at cost minus any impairment, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments of the same issuer. During the three months ended September 30, 2018, we recognized a non-cash impairment charge of $10.0 million related to our June 2017 investment. The impairment charge is included in Impairment costs within our condensed consolidated statements of operations. In connection with our quarterly qualitative assessment of this investment for impairment indicators, we identified factors that led us to conclude that the investment was impaired and the fair value of the investment was less than the carrying value. The most significant of such factors was related to the business prospects of the investee. Accordingly, we performed an analysis to determine the fair value of the investment and concluded that our best estimate of its fair value was $0.0 million as of September 30, 2018. This is considered a Level 3 measurement under the fair value hierarchy.

There has been no impairment or upward or downward adjustments for our October 2016 equity investment as of September 30, 2018 that would impact the carrying amount of the investment. The October 2016 investment is classified within other assets in the condensed consolidated balance sheet.

Note 10. Intangible Assets, net

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

	September 30, 2018
	Cost		Accumulated Amortization			Net
Purchased content	$	39,105	$	(27,978	)	$	11,127
Software	21,893		(12,534		)	9,359
Customer relationships	103,900		(57,304		)	46,596
Developed technology	111,980		(69,137		)	42,843
Trade names and trademarks	4,900		(4,658		)	242
Intangibles-in-progress	3,720		—			3,720
Total	$	285,498	$	(171,611	)	$	113,887

	December 31, 2017
	Cost		Accumulated Amortization			Net
Purchased content	$	35,260	$	(20,480	)	$	14,780
Software	18,957		(8,899		)	10,058
Customer relationships	103,900		(46,365		)	57,535
Developed technology	113,380		(56,664		)	56,716
Trade names and trademarks	4,900		(3,943		)	957
Advertising relationships	9,000		(8,525		)	475
Intangibles-in-progress	2,190		—			2,190
Total	$	287,587	$	(144,876	)	$	142,711

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Amortization expense recorded for intangible assets for the three months ended September 30, 2018 and 2017 was $12.0 million and $13.4 million, respectively. Amortization expense recorded for intangible assets for the nine months ended September 30, 2018 and 2017 was $37.6 million and $39.9 million, respectively. These amounts are included in technology and development expenses.

We have an indefinite-lived intangible asset that we recorded in connection with our February 2015 acquisition of Trulia for Trulia’s trade names and trademarks that is not subject to amortization. The carrying value of the Trulia trade names and trademarks intangible asset was $177.0 million as of September 30, 2018 and December 31, 2017.

Intangibles-in-progress consists of software that is capitalizable but has not been placed in service.

Note 11. Deferred Revenue

The following tables present the changes in deferred revenue for the periods presented (in thousands):

	Three Months Ended September 30, 2018
Balance as of July 1, 2018	$	35,920
Deferral of revenue	253,571
Less: Revenue recognized	(253,532		)
Balance as of September 30, 2018	$	35,959

	Nine Months Ended September 30, 2018
Balance as of January 1, 2018	$	31,918
Deferral of revenue	742,427
Less: Revenue recognized	(738,386		)
Balance as of September 30, 2018	$	35,959

During the three months ended September 30, 2018, we recognized as revenue a total of $33.0 million pertaining to amounts that were recorded in deferred revenue as of June 30, 2018. During the nine months ended September 30, 2018, we recognized as revenue a total of $30.6 million pertaining to amounts that were recorded in deferred revenue as of December 31, 2017.

Note 12. Debt

Revolving Credit Facility

On July 31, 2018, certain wholly owned subsidiaries of Zillow Group entered into a revolving credit agreement with Credit Suisse AG, Cayman Islands Branch, as the directing lender, and certain other parties thereto (the “Revolving Credit Facility”). The Revolving Credit Facility provides for a maximum borrowing capacity of $250.0 million (the “Maximum Amount”) with a current borrowing capacity of $25.0 million as of September 30, 2018, which amount may be increased up to the Maximum Amount subject to the satisfaction of certain conditions, through a non-recourse credit facility secured by a pledge of the equity of certain Zillow Group subsidiaries that purchase and sell select residential properties through Zillow Offers. In certain circumstances Zillow Group may be obligated to fund some or all of the payment obligations under the Revolving Credit Facility. Zillow Group formed certain special purpose entities to effectuate the transactions contemplated by the agreement underlying the Revolving Credit Facility. Each special purpose entity is a wholly owned subsidiary of Zillow Group and a separate legal entity, and neither the assets nor credit of any such entity are available to satisfy the debts and other obligations of any affiliate or other entity.

The Revolving Credit Facility has an initial term of one year which may be extended for up to three years, subject to agreement by the directing lender. The Revolving Credit Facility includes customary representations and warranties, covenants (including financial covenants applicable to Zillow Group), and provisions regarding events of default. As of September 30, 2018, Zillow Group was in compliance with all financial covenants and no event of default had occurred. Availability under the Revolving Credit Facility is limited by a formula equal to the lower of 85% of the aggregate acquisition cost of financed residential properties or 85% of the aggregate market value, which for each residential property is the sum of the value established by an independent broker-pricing opinion and renovation costs paid.

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Pursuant to the terms of the Revolving Credit Facility, we are required to establish, maintain, and in certain circumstances fund, certain specified reserve accounts. These reserve accounts include, but are not limited to, interest reserves, insurance, tax and HOA fee reserves, renovation cost reserves and special reserves. The credit facility reserve accounts and the collection account into which funds are deposited upon the resale of financed residential properties, which funds are used to repay amounts borrowed on the Revolving Credit Facility, are under the sole control of Credit Suisse AG, New York Branch, as defined in the agreement governing the Revolving Credit Facility. Amounts funded to these reserve accounts and the collection account have been classified within our condensed consolidated balance sheets as restricted cash. Borrowings on our Revolving Credit Facility bear interest at the one-month London Interbank Offered Rate (“LIBOR”) plus an applicable margin. We are also required to pay a funding fee for each financed residential property and certain other fees to certain other parties to the agreement. Interest, funding fees and other fees, including the amortization of deferred issuance costs, are classified within interest expense in our condensed consolidated statements of operations.

As of September 30, 2018, we have outstanding $24.7 million of borrowings on the Revolving Credit Facility and approximately $0.3 million is currently available for future borrowings.

Convertible Senior Notes due in 2023

On July 3, 2018, Zillow Group issued $373.8 million aggregate principal amount of Convertible Senior Notes due 2023 (the “2023 Notes”), which includes $48.8 million principal amount of 2023 Notes sold pursuant to the underwriters’ option to purchase additional 2023 Notes. The 2023 Notes bear interest at a fixed rate of 1.50% per year, payable semiannually in arrears on January 1 and July 1 of each year, beginning on January 1, 2019. The 2023 Notes are convertible into cash, shares of Class C capital stock or a combination thereof, at our election. The 2023 Notes will mature on July 1, 2023, unless earlier repurchased, redeemed, or converted in accordance with their terms.

The net proceeds from the issuance of the 2023 Notes were approximately $364.0 million, after deducting underwriting discounts and commissions and offering expenses payable by the Company. We used approximately $29.4 million of the net proceeds from the issuance of the 2023 Notes to pay the cost of the Capped Call Confirmations described below. The Company intends to use the remainder of the net proceeds for general corporate purposes.

Prior to the close of business on the business day immediately preceding April 1, 2023, the 2023 Notes are convertible at the option of the holders only under certain conditions. On or after April 1, 2023, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their 2023 Notes at their option at the conversion rate then in effect, irrespective of these conditions. The Company will settle conversions of the 2023 Notes by paying or delivering, as the case may be, cash, shares of the Company’s Class C capital stock, or a combination of cash and shares of Class C capital stock, at its election. The conversion rate will initially be 12.7592 shares of Class C capital stock per $1,000 principal amount of 2023 Notes (equivalent to an initial conversion price of approximately $78.37 per share of Class C capital stock). The conversion rate is subject to customary adjustments upon the occurrence of certain events. The Company may redeem for cash all or part of the 2023 Notes, at its option, on or after July 6, 2021, under certain circumstances at a redemption price equal to 100% of the principal amount of the 2023 Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date (as defined in the indenture governing the 2023 Notes). The conversion option does not meet the criteria for separate accounting as a derivative as it is indexed to our own stock.

If the Company undergoes a fundamental change (as defined in the indenture governing the 2023 Notes), holders may require the Company to repurchase for cash all or part of their 2023 Notes at a repurchase price equal to 100% of the principal amount of the 2023 Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date (as defined in the indenture governing the 2023 Notes). In addition, if certain fundamental changes occur, the Company may be required in certain circumstances to increase the conversion rate for any Notes converted in connection with such fundamental changes by a specified number of shares of its Class C capital stock. Certain events are also considered “Events of Default,” which may result in the acceleration of the maturity of the 2023 Notes, as described in the indenture governing the 2023 Notes. There are no financial covenants associated with the 2023 Notes.

We may not redeem the 2023 Notes prior to July 6, 2021. We may redeem for cash all or any portion of the 2023 Notes, at our option, in whole or in part on or after July 6, 2021 if the last reported sale price per share of our Class C capital stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period.

In accounting for the issuance of the 2023 Notes, the Company separated the 2023 Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component, representing the conversion

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option, was determined by deducting the fair value of the liability component from the par value of the 2023 Notes. The difference between the principal amount of the 2023 Notes and the liability component represents the debt discount, which is recorded as a direct deduction from the related debt liability in the condensed consolidated balance sheet and amortized to interest expense using the effective interest method over the term of the 2023 Notes. The equity component of the 2023 Notes of approximately $78.6 million is included in additional paid-in capital in the condensed consolidated balance sheet and is not remeasured as long as it continues to meet the conditions for equity classification.

Interest expense related to the 2023 Notes for the three and nine month periods ended September 30, 2018 was $5.0 million, which is comprised of approximately $3.6 million related to the amortization of debt discount and debt issuance costs and $1.4 million for the contractual coupon interest.

The effective interest rate on the liability component of the 2023 Notes for the three and nine month periods ended September 30, 2018 is 6.99%. Accrued interest related to the 2023 Notes as of September 30, 2018 was $1.4 million and is recorded in accrued expenses and other current liabilities in the condensed consolidated balance sheet.

The following table presents the outstanding principal amount and carrying value of the 2023 Notes as of the date presented (in thousands):

	Outstanding Principal Amount		Unamortized Debt Discount and Debt Issuance Costs			Carrying Value
September 30, 2018	$	373,750	$	(82,717	)	$	291,033

As of September 30, 2018, the unamortized debt discount and debt issuance costs for the 2023 Notes will be amortized to interest expense over a remaining period of approximately 57 months.

The estimated fair value of the 2023 Notes was $344.3 million as of September 30, 2018. The estimated fair value of the 2023 Notes was determined through consideration of quoted market prices. The fair value is classified as Level 3 due to the limited trading activity for the 2023 Notes.

The Capped Call Confirmations are expected generally to reduce the potential dilution of our Class C capital stock upon any conversion of 2023 Notes and/or offset the cash payments the Company is required to make in excess of the principal amount of the 2023 Notes in the event that the market price of the Class C capital stock is greater than the strike price of the Capped Call Confirmations (which initially corresponds to the initial conversion price of the 2023 Notes and is subject to certain adjustments under the terms of the Capped Call Confirmations), with such reduction and/or offset subject to a cap based on the cap price of the Capped Call Confirmations. The Capped Call Confirmations have an initial cap price of $105.45 per share, which represents a premium of approximately 85% over the public offering price of the Company’s Class C capital stock in the concurrent share offering of $57.00, and is subject to certain adjustments under the terms of the Capped Call Confirmations. The Capped Call Confirmations will cover, subject to anti-dilution adjustments substantially similar to the 2023 Notes, the number of shares of Class C capital stock that will underlie the 2023 Notes. The Capped Call Confirmations do not meet the criteria for separate accounting as a derivative as they are indexed to our own stock. The premiums paid for the Capped Call Confirmations have been included as a net reduction to additional paid-in-capital within shareholders’ equity.

Convertible Senior Notes due in 2021

On December 12, 2016, Zillow Group issued $460.0 million aggregate principal amount of 2.00% Convertible Senior Notes due 2021 (the “2021 Notes”), which amount includes the exercise in full of the $60.0 million over-allotment option, to Citigroup Global Markets Inc. as the initial purchaser of the 2021 Notes in a private offering to the initial purchaser in reliance on the exemption from the registration requirements provided by Section 4(a)(2) of the Securities Act of 1933, as amended (the “Securities Act”) for resale to qualified institutional buyers as defined in, and pursuant to, Rule 144A under the Securities Act. The 2021 Notes bear interest at a fixed rate of 2.00% per year, payable semiannually in arrears on June 1 and December 1 of each year. The 2021 Notes are convertible into cash, shares of our Class C capital stock or a combination thereof, at the Company’s election. The 2021 Notes will mature on December 1, 2021, unless earlier repurchased, redeemed, or converted in accordance with their terms.

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The net proceeds from the issuance of the 2021 Notes were approximately $447.8 million, after deducting fees and expenses. The Company used approximately $370.2 million of the net proceeds from the issuance of the 2021 Notes to repurchase a portion of the outstanding 2020 Notes (see additional information below under “Trulia’s Convertible Senior Notes due 2020”) in privately negotiated transactions. In addition, the Company used approximately $36.6 million of the net proceeds from the issuance of the 2021 Notes to pay the cost of the capped call transactions with the initial purchaser of the 2021 Notes and two additional financial institutions (“Capped Call Confirmations”) as discussed further below. The Company used the remainder of the net proceeds for general corporate purposes.

Prior to the close of business on the business day immediately preceding September 1, 2021, the 2021 Notes are convertible at the option of the holders of the 2021 Notes only under certain conditions, none of which conditions have been satisfied as of September 30, 2018. On or after September 1, 2021, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders of the 2021 Notes may convert their 2021 Notes at their option at the conversion rate then in effect, irrespective of these conditions. The Company will settle conversions of the 2021 Notes by paying or delivering, as the case may be, cash, shares of Class C capital stock, or a combination of cash and shares of Class C capital stock, at its election. The conversion rate will initially be 19.0985 shares of Class C capital stock per $1,000 principal amount of 2021 Notes (equivalent to an initial conversion price of approximately $52.36 per share of Class C capital stock). The conversion rate is subject to customary adjustments upon the occurrence of certain events. The Company may redeem for cash all or part of the 2021 Notes, at its option, on or after December 6, 2019, under certain circumstances at a redemption price equal to 100% of the principal amount of the 2021 Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date (as defined in the indenture governing the 2021 Notes). The conversion option does not meet the criteria for separate accounting as a derivative as it is indexed to our own stock.

If the Company undergoes a fundamental change (as defined in the indenture governing the 2021 Notes), holders of the 2021 Notes may require the Company to repurchase for cash all or part of their 2021 Notes at a repurchase price equal to 100% of the principal amount of the 2021 Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date (as defined in the indenture governing the 2021 Notes). In addition, if certain fundamental changes occur, the Company may be required in certain circumstances to increase the conversion rate for any 2021 Notes converted in connection with such fundamental changes by a specified number of shares of its Class C capital stock. Certain events are also considered “Events of Default,” which may result in the acceleration of the maturity of the 2021 Notes, as described in the indenture governing the notes. There are no financial covenants associated with the 2021 Notes.

We may not redeem the 2021 Notes prior to December 6, 2019. We may redeem the 2021 Notes for cash, at our option, in whole or in part on or after December 6, 2019, if the last reported sale price per share of our Class C capital stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period.

Interest expense related to the 2021 Notes for the three months ended September 30, 2018 was $7.2 million, which is comprised of approximately $4.9 million related to the amortization of debt discount and debt issuance costs and $2.3 million for the contractual coupon interest. Interest expense related to the 2021 Notes for the nine months ended September 30, 2018 was $21.3 million, which is comprised of approximately $14.4 million related to the amortization of debt discount and debt issuance costs and $6.9 million for the contractual coupon interest. The effective interest rate on the liability component of the 2021 Notes for the three and nine months ended September 30, 2018 is 7.44%. Accrued interest related to the 2021 Notes as of September 30, 2018 and December 31, 2017 was $3.1 million and $0.8 million, respectively, and is recorded in accrued expenses and other current liabilities in the condensed consolidated balance sheet.

The following table presents the outstanding principal amount and carrying value of the 2021 Notes as of the dates presented (in thousands):

	Outstanding Principal Amount		Unamortized Debt Discount and Debt Issuance Costs			Carrying Value
September 30, 2018	$	460,000	$	(70,332	)	$	389,668
December 31, 2017	$	460,000	$	(84,721	)	$	375,279

As of September 30, 2018, the unamortized debt discount and debt issuance costs for the 2021 Notes will be amortized to interest expense over a remaining period of approximately 38 months.

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The estimated fair value of the 2021 Notes was $498.5 million and $509.0 million, respectively, as of September 30, 2018 and December 31, 2017. The estimated fair value of the 2021 Notes was determined through consideration of quoted market prices. The fair value is classified as Level 3 due to the limited trading activity for the 2021 Notes.

The Capped Call Confirmations are expected generally to reduce the potential dilution of our Class C capital stock upon any conversion of 2021 Notes and/or offset the cash payments the Company is required to make in excess of the principal amount of the 2021 Notes in the event that the market price of the Class C capital stock is greater than the strike price of the Capped Call Confirmations (which initially corresponds to the initial conversion price of the 2021 Notes and is subject to certain adjustments under the terms of the Capped Call Confirmations), with such reduction and/or offset subject to a cap based on the cap price of the Capped Call Confirmations. The Capped Call Confirmations have an initial cap price of $69.19 per share, which represents a premium of approximately 85% over the closing price of the Company’s Class C capital stock on The Nasdaq Global Select Market on December 6, 2016, and is subject to certain adjustments under the terms of the Capped Call Confirmations. The Capped Call Confirmations will cover, subject to anti-dilution adjustments substantially similar to those applicable to the 2021 Notes, the number of shares of Class C capital stock that will underlie the 2021 Notes. In addition, the Capped Call Confirmations provide for the Company to elect, subject to certain conditions, for the Capped Call Confirmations to remain outstanding (with certain modifications) following its election to redeem the 2021 Notes, notwithstanding any conversions of 2021 Notes in connection with such redemption. The Capped Call Confirmations do not meet the criteria for separate accounting as a derivative as they are indexed to our own stock. The premiums paid for the Capped Call Confirmations have been included as a net reduction to additional paid-in capital within shareholders’ equity.

Trulia’s Convertible Senior Notes due in 2020

In connection with the February 2015 acquisition of Trulia, a portion of the total purchase price was allocated to Trulia’s Convertible Senior Notes due in 2020 (the “2020 Notes”), which are unsecured senior obligations. Pursuant to and in accordance with the Merger Agreement, Zillow Group entered into a supplemental indenture in respect of the 2020 Notes in the aggregate principal amount of $230.0 million, which supplemental indenture provides, among other things, that, at the effective time of the Trulia Merger, (i) each outstanding 2020 Note is no longer convertible into shares of Trulia common stock and is convertible solely into shares of Zillow Group Class A common stock, pursuant to, and in accordance with, the terms of the indenture governing the 2020 Notes, and (ii) Zillow Group guaranteed all of the obligations of Trulia under the 2020 Notes and related indenture. In December 2016, the Company used approximately $370.2 million of the net proceeds from the issuance of the 2021 Notes discussed above to repurchase $219.9 million aggregate principal of the 2020 Notes in privately negotiated transactions. The aggregate principal amount of the 2020 Notes is due on December 15, 2020 if not earlier converted or redeemed. Interest is payable on the 2020 Notes at the rate of 2.75% semi-annually on June 15 and December 15 of each year.

Holders of the 2020 Notes may convert all or any portion of their notes, in multiples of $1,000 principal amount, at their option at any time prior to the close of business on the business day immediately preceding the maturity date. Regarding the supplemental indenture in respect of the 2020 Notes, the conversion ratio immediately prior to the effective time of the Trulia Merger of 27.8303 shares of Trulia common stock per $1,000 principal amount of notes was adjusted to 12.3567 shares of our Class A common stock per $1,000 principal amount of notes based on the exchange ratio of 0.444 per the Merger Agreement. This was equivalent to an initial conversion price of approximately $80.93 per share of our Class A common stock. Regarding the August 2015 distribution of shares of our Class C capital stock as a dividend to our Class A and Class B common shareholders, the conversion ratio has been further adjusted to 41.4550 shares of Class A common stock per $1,000 principal amount of notes, which is equivalent to a conversion price of approximately $24.12 per share of our Class A common stock. The conversion ratio will be adjusted for certain dilutive events and will be increased in the case of corporate events that constitute a “Make-Whole Fundamental Change” (as defined in the indenture governing the notes). The conversion option of the 2020 Notes has no cash settlement provisions. The conversion option does not meet the criteria for separate accounting as a derivative as it is indexed to our own stock.

The holders of the 2020 Notes will have the ability to require us to repurchase the notes in whole or in part upon the occurrence of an event that constitutes a “Fundamental Change” (as defined in the indenture governing the notes, including such events as a “change in control” or “termination of trading”, subject to certain exceptions). In such case, the repurchase price would be 100% of the principal amount of the 2020 Notes plus accrued and unpaid interest, if any, to, but excluding, the Fundamental Change repurchase date. Certain events are also considered “Events of Default,” which may result in the acceleration of the maturity of the 2020 Notes, as described in the indenture governing the notes. There are no financial covenants associated with the 2020 Notes.

The 2020 Notes are redeemable, at our option, in whole or in part on or after December 20, 2018, if the last reported sale price per share of our Class A common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period.

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The carrying value of the 2020 Notes was $9.6 million and $10.1 million, respectively, as of September 30, 2018 and December 31, 2017. The estimated fair value of the 2020 Notes was $16.7 million and $17.6 million, respectively, as of September 30, 2018 and December 31, 2017. The estimated fair value of the 2020 Notes was determined through consideration of quoted market prices. The fair value is classified as Level 3 due to the limited trading activity for the 2020 Notes.

Note 13. Income Taxes

We are subject to federal and state income taxes in the United States and in Canada. As of September 30, 2018 and December 31, 2017, 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 $1,014.0 million as of December 31, 2017, which are available to reduce future taxable income. We have accumulated state tax losses of approximately $21.4 million (tax effected) as of December 31, 2017.

We recorded an income tax benefit of $14.7 million for the three months ended September 30, 2018, which was calculated as the difference between the income tax benefit of $22.7 million recorded for the nine months ended September 30, 2018 and the income tax benefit of $8.0 million recorded for the six months ended June 30, 2018. The $22.7 million tax benefit recorded for the nine months ended September 30, 2018 is comprised of a $1.9 million income tax benefit, which was calculated using an estimate of our annual effective tax rate of 4.3% applied to our loss before income taxes of $44.9 million for the nine months ended September 30, 2018 and a $20.8 million discrete income tax benefit as a result of the treatment of stock compensation windfall deductions and the impact from the Tax Act related to IRC Section 162(m). Our estimated annual effective tax rate for the nine months ended September 30, 2018 is primarily impacted by the release in valuation allowance resulting from indefinite-lived deferred tax assets and their ability to offset indefinite-lived intangible deferred tax liabilities.

As of September 30, 2018, we have completed our accounting for the income tax effects related to the deduction limitations on compensation under the Tax Act and have recorded a discrete tax benefit adjustment of $3.3 million during the three months ended September 30, 2018. The Internal Revenue Service has provided further guidance in applying the written binding contracts requirement under the Tax Act and certain of our executive compensation previously eligible to be deducted for tax purposes under Section 162(m) of the Internal Revenue Code will be considered grandfathered and, therefore, will continue to be deductible. Based on the clarification of these rules, the accounting related to the Section 162(m) limitation of the Internal Revenue Code is considered complete and we have recorded a $5.9 million discrete tax benefit adjustment related to this item for the nine months ended September 30, 2018.

Note 14. 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 September 30, 2018 or December 31, 2017.

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. During the nine months ended September 30, 2018 and the year ended December 31, 2017, no shares of Class B common stock were converted into Class A common stock at the option of the holders. 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. On July 3, 2018, Zillow Group issued and sold 6,557,017 shares (of which 855,263 shares were related to the exercise of the underwriters’ option to purchase additional shares) of our Class C capital stock at a public offering price of $57.00 per share. We received net proceeds of $360.3 million after deducting underwriting discounts and commissions and offering expenses payable by us.

Note 15. Share-Based Awards

In connection with our February 2015 acquisition of Trulia, we assumed the obligations of Zillow and Trulia outstanding under pre-existing stock plans. We intend that future equity grants will be made under Zillow Group’s 2011 Amended and Restated Incentive Plan (as amended and/or restated from time to time, the “2011 Plan”) only (or a successor thereto).

Zillow Group, Inc. Amended and Restated 2011 Incentive Plan

On July 19, 2011, the 2011 Plan became effective. In addition to the share reserve of 18,400,000 shares, the number of shares available for issuance under the 2011 Plan automatically increases on the first day of each of our fiscal years by a number of shares equal to the least of (a) 3.5% of our outstanding Class A common stock, Class B common stock, and Class C capital stock on a fully diluted basis as of the end of our immediately preceding fiscal year, (b) 10,500,000 shares, and (c) a lesser amount determined by our board of directors; provided, however, that any shares from any increases in previous years that are not actually issued will continue to be available for issuance under the 2011 Plan. In addition, shares previously available for grant under Zillow, Inc.’s 2005 Equity Incentive Plan (the “2005 Plan”), but not issued or subject to outstanding awards under the 2005 Plan as of July 19, 2011, and shares subject to outstanding awards under the 2005 Plan that subsequently cease to be subject to such awards (other than by reason of exercise of the awards) are available for grant under the 2011 Plan. The 2011 Plan is administered by the compensation committee of the board of directors. Under the terms of the 2011 Plan, the compensation committee may grant equity awards, including incentive stock options, nonqualified stock options, restricted stock, restricted stock units or restricted units to employees, officers, directors, consultants, agents, advisers and independent contractors. The board of directors has also authorized certain senior executive officers to grant equity awards under the 2011 Plan, within limits prescribed by our board of directors. The 2011 Plan provides that in the event of a stock dividend, stock split or similar event, the maximum number and kind of securities available for issuance under the plan will be proportionally adjusted.

Options under the 2011 Plan are granted with an exercise price per share not less than 100% of the fair market value of our stock on the date of grant, with the exception of substituted option awards granted in connection with acquisitions, and are exercisable at such times and under such conditions as determined by the compensation committee. Any portion of an option that is not vested and exercisable on the date of a participant’s termination of service expires on such date. Employees generally forfeit their rights to exercise vested options 3 months following their termination of employment or 12 months following termination by reason of death, disability or retirement. Options granted under the 2011 Plan typically expire seven or ten years from the grant date and typically vest either 25% after 12 months and ratably thereafter over the next 36 months or quarterly over a period of four years, though certain options have been granted with alternative vesting schedules.

Restricted stock units granted under the 2011 Plan typically vest either 25% after 12 months and quarterly thereafter over the next three years, quarterly over a period of four years, or 12.5% after 6 months and quarterly thereafter for the next 3.5 years. Any portion of a restricted stock unit that is not vested on the date of a participant’s termination of service expires on such date.

Option Awards

The following table summarizes option award activity for the nine months ended September 30, 2018:

	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, 2018	26,645,206		$	27.70	5.72	$	355,739
Granted	5,429,505		53.63
Exercised	(5,177,060	)	22.14
Forfeited or cancelled	(610,688	)	34.55
Outstanding at September 30, 2018	26,286,963		33.99		6.24	321,371
Vested and exercisable at September 30, 2018	14,128,452		29.07		4.76	220,974

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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 September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
Expected volatility	42%	46%	42%-45%	46%-49%
Expected dividend yield	—	—	—	—
Risk-free interest rate	2.84%	1.70%	2.52%-2.84%	1.67%-1.84%
Weighted-average expected life	4.50 years	4.25 years	4.50-5.00 years	4.25-4.75 years
Weighted-average fair value of options granted	$19.21	$15.79	$20.89	$14.40

As of September 30, 2018, there was a total of $179.9 million in unrecognized compensation cost related to unvested stock options.

Restricted Stock Units

The following table summarizes activity for restricted stock units for the nine months ended September 30, 2018:

	Restricted Stock Units		Weighted- Average Grant- Date Fair Value
Unvested outstanding at January 1, 2018	4,016,405		$	33.22
Granted	2,898,786		52.75
Vested	(1,288,746	)	35.07
Forfeited or cancelled	(524,952	)	38.50
Unvested outstanding at September 30, 2018	5,101,493		43.33

The fair value of outstanding restricted stock units will be recorded as share-based compensation expense over the vesting period. As of September 30, 2018, there was $205.9 million of total unrecognized compensation cost related to unvested restricted stock units.

Share-Based Compensation Expense

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Cost of revenue	$	969	$	1,014	$	3,180	$	2,942
Sales and marketing	5,911		5,914		17,413		17,694
Technology and development	15,031		10,438		40,920		29,329
General and administrative	19,771		11,208		49,853		34,197
Total	$	41,682	$	28,574	$	111,366	$	84,162

Note 16. 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.

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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 2020 Notes using the if-converted method.

Since the Company expects to settle the principal amount of the outstanding 2021 Notes and 2023 Notes in cash, the Company uses the treasury stock method for calculating any potential dilutive effect of the conversion spread on diluted net income per share, if applicable. For the 2021 Notes, the conversion spread of approximately 8.8 million shares has a dilutive impact on diluted net income per share when the market price of the Company’s Class C capital stock at the end of a period exceeds the conversion price of $52.36 per share. For the 2023 Notes, the conversion spread of approximately 4.8 million shares has a dilutive impact on diluted net income per share when the market price of the Company’s Class C capital stock at the end of a period exceeds the conversion price of $78.37 per share.

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 September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
Denominator for basic calculation	202,416	187,692	195,208	185,447
Effect of dilutive securities:
Option awards	—	7,401	—	—
Unvested restricted stock units	—	1,332	—	—
Denominator for dilutive calculation	202,416	196,425	195,208	185,447

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 September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
Weighted-average Class A common stock and Class C capital stock option awards outstanding	21,766	6,542	23,508	28,671
Weighted-average Class A common stock and Class C capital stock restricted stock units outstanding	5,072	199	4,891	4,311
Class A common stock issuable upon conversion of the 2020 Notes	410	438	410	438
Total Class A common stock and Class C capital stock equivalents	27,248	7,179	28,809	33,420

In the event of liquidation, dissolution, distribution of assets or winding-up of the Company, the holders of all classes of common and capital stock have equal rights to receive all the assets of the Company after the rights of the holders of preferred stock have been satisfied. We have not presented net income (loss) per share under the two-class method for our Class A common stock, Class B common stock and Class C capital stock because it would be the same for each class due to equal dividend and liquidation rights for each class.

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Note 17. Commitments and Contingencies

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 2018 and 2024. We are committed to pay a portion of the related operating expenses under certain of these lease agreements. Certain of these arrangements have free rent periods or escalating rent payment provisions, and we recognize rent expense under such arrangements on a straight-line basis. Operating lease expense for the three months ended September 30, 2018 and 2017 was $5.8 million and $5.7 million, respectively. Operating lease expense for the nine months ended September 30, 2018 and 2017 was $17.2 million and $15.8 million, respectively.

Purchase Commitments

Purchase commitments primarily include various non-cancelable agreements to purchase content related to our mobile applications and websites as well as homes that the Company is under contract to purchase through Zillow Offers but that have not closed as of the respective date. As of September 30, 2018, the value of homes under contract that not have closed was $30.3 million.

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 $3.5 million and $3.7 million, respectively, as of September 30, 2018 and December 31, 2017.

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.

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. A federal jury trial began on January 23, 2017, and on February 9, 2017, the jury 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. In March 2017, the Company filed motions in the district court seeking judgment for the Company on certain claims that are the subject of the verdict, and for a new trial on others. On June 20, 2017, the judge ruled and granted in part our 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 October 26, 2017, the Company 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 oral hearing for the appeal took place on August 28, 2018. We have recorded an estimated liability for approximately $4.1 million as of September 30, 2018 and December 31, 2017. We do not believe there is a reasonable possibility that a material loss in excess of amounts accrued may be incurred.

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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 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 May 2018, the plaintiffs filed their opposition to our motion to dismiss the consolidated amended complaint. In June 2018, we filed our reply in support of our motion to dismiss the consolidated amended complaint. In October 2018, our motion to dismiss was granted, though the plaintiffs have 45 days to attempt to cure the defects in their consolidated amended complaint. We have denied the allegations of wrongdoing and intend to vigorously defend the claims in this lawsuit. We have not recorded an accrual related to this lawsuit as of September 30, 2018 and December 31, 2017, as we do not believe a loss is probable.

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, 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, the defendants breached their fiduciary duties in connection with oversight of 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. All four of the shareholder derivative lawsuits have been stayed until after final resolution of pleading motions and related appeals, if any, in the consolidated securities class action lawsuit discussed above. The defendants intend to deny the allegations of wrongdoing and vigorously defend the claims in these lawsuits. We have not recorded an accrual related to these lawsuits as of September 30, 2018 and December 31, 2017, as we do not believe a loss is probable.

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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Note 18. Self-Insurance

We are self-insured for medical benefits, and beginning on January 1, 2018 for dental benefits, for all qualifying Zillow Group employees. The medical plan carries a stop-loss policy which will protect when cumulative medical claims exceed 125% of expected claims for the plan year with a limit of $1.0 million and from individual claims during the plan year exceeding $150,000. We record estimates of the total costs of claims incurred based on an analysis of historical data and independent estimates. Our liability for self-insured claims is included within accrued compensation and benefits in our condensed consolidated balance sheets and was $3.0 million and $2.0 million, respectively, as of September 30, 2018 and December 31, 2017.

Note 19. 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 for the three months ended September 30, 2018 and 2017 was $4.1 million and $3.0 million, respectively. The total expense related to the Zillow Group 401(k) Plan for the nine months ended September 30, 2018 and 2017 was $11.9 million and $8.9 million, respectively.

Note 20. Segment Information and Revenue

Beginning in the second quarter of 2018, we have two 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 of the Internet, Media & Technology (“IMT”) and Homes segments.

The IMT segment includes the financial results for the Premier Agent, Rentals, Mortgages 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 Homes segment includes the financial results from Zillow Group’s buying and selling of homes directly.

Revenue and costs are generally directly attributed to our segments. However, due to the integrated structure of our business, certain costs incurred by one segment may benefit the other segment. These costs are generally headcount-related and are allocated to each segment based on the estimated effort attributable to each segment.

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

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	Three Months Ended September 30, 2018									Nine Months Ended September 30, 2018
	IMT			Homes			Consolidated			IMT			Homes			Consolidated
Revenue:
Premier Agent	$	232,703		$	—		$	232,703		$	677,320		$	—		$	677,320
Rentals	37,319			—			37,319			99,670			—			99,670
Mortgages	18,438			—			18,438			56,766			—			56,766
Other	43,616			—			43,616			123,445			—			123,445
Homes	—			11,018			11,018			—			11,018			11,018
Total revenue	332,076			11,018			343,094			957,201			11,018			968,219
Costs and expenses:
Cost of revenue	26,386			10,286			36,672			75,832			10,286			86,118
Sales and marketing	123,755			4,979			128,734			405,525			8,227			413,752
Technology and development	99,570			5,744			105,314			286,983			12,640			299,623
General and administrative	65,156			5,587			70,743			172,756			14,639			187,395
Impairment costs	10,000			—			10,000			10,000			—			10,000
Acquisition-related costs	1,405			—			1,405			2,064			—			2,064
Integration costs	523			—			523			523			—			523
Total costs and expenses	326,795			26,596			353,391			953,683			45,792			999,475
Income (loss) from operations	5,281			(15,578		)	(10,297		)	3,518			(34,774		)	(31,256		)
Other income	7,773			—			7,773			13,308			—			13,308
Interest expense	(12,236		)	(432		)	(12,668		)	(26,496		)	(432		)	(26,928		)
Income (loss) before income taxes	$	818		$	(16,010	)	$	(15,192	)	$	(9,670	)	$	(35,206	)	$	(44,876	)

We have not presented the comparable 2017 periods in the table above because we had one operating and reportable segment prior to 2018.

Note 21. Subsequent Events

Acquisition of Mortgage Lenders of America

On October 31, 2018, Zillow Group’s wholly owned subsidiary, ZGM Holdco, Inc., acquired Mortgage Lenders of America, L.L.C. (“MLOA”), a national mortgage lender headquartered in Overland Park, Kansas for approximately $65.0 million in cash, subject to certain adjustments. The purchase price will be allocated to the assets acquired and liabilities assumed, including identifiable intangible assets, based on their respective fair values at the acquisition date. We are currently performing the procedures necessary to determine the purchase price allocation and will record estimated fair values during the fourth quarter of 2018.

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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 II, Item 1A (Risk Factors) of this report.

Overview of our Business

Zillow Group, Inc. operates the largest portfolio of real estate and home-related brands on mobile and the web which focus on all stages of the home lifecycle: renting, buying, selling and financing. Zillow Group is committed to empowering consumers with unparalleled data, inspiration and knowledge around homes, and connecting them with great real estate professionals. The Zillow Group portfolio of consumer brands includes real estate and rental marketplaces Zillow, Trulia, StreetEasy, HotPads, Naked Apartments, RealEstate.com and Out East. In addition, Zillow Group provides a comprehensive suite of marketing software and technology solutions to help real estate professionals maximize business opportunities and connect with millions of consumers. Beginning in April of 2018, Zillow Offers provides homeowners in certain metropolitan areas with the opportunity to receive offers to purchase their home from Zillow. When Zillow buys a home, it makes certain repairs and updates and lists the home for resale on the open market. We also own and operate a number of business brands for real estate, rental and mortgage professionals, including Mortech, dotloop, Bridge Interactive and New Home Feed.

Our living database of approximately 110 million U.S. homes, including homes for sale, homes for rent and homes not currently on the market, attracts an active and vibrant community of users. Individuals and businesses that use Zillow’s mobile applications and websites have updated information on more than 80 million homes, creating exclusive home profiles not available anywhere else. These profiles include detailed information about homes, including property facts, listing information and purchase and sale data. We provide this information to our users where, when and how they want it, through our industry-leading mobile applications and websites. Using complex, proprietary automated valuation models, we provide current home value estimates, or Zestimates, and current rental price estimates, or Rent Zestimates, on approximately 100 million U.S. homes.

As of the second quarter of 2018, Zillow Group has two reportable segments: the Internet, Media & Technology (“IMT”) segment, our historical operating and reportable segment, and the Homes segment. In connection with our IMT segment, we generate revenue from the sale of advertising services and our suite of marketing software and technology solutions to businesses and professionals primarily associated with the residential real estate, rental and mortgage industries. These professionals include real estate, rental and mortgage professionals and brand advertisers. Our four primary revenue categories within our IMT segment are Premier Agent, Rentals, Mortgages and Other.

Premier Agent revenue is generated by the sale of advertising under our Premier Agent and Premier Broker programs, which offer a suite of marketing and business technology products and services to help real estate agents and brokers achieve their advertising goals, while growing and managing their businesses and brands. We offer our Premier Agent and Premier Broker advertising products on a cost per impression basis. Impressions are delivered when a sold advertisement appears on pages viewed by users of our mobile applications and websites. Rentals revenue primarily includes advertising sold to property managers and other rental professionals on a cost per lead, cost per click or cost per lease generated basis. Mortgages revenue primarily includes advertising sold to mortgage lenders and other mortgage professionals on a cost per lead basis, including our Connect (formerly known as Long Form) and Custom Quote services, as well as revenue generated by Mortech, which provides subscription-based mortgage software solutions, including a product and pricing engine and lead management platform. Other revenue primarily includes revenue generated by new construction and display, as well as revenue from the sale of various other advertising and business software solutions and services and technology solutions for real estate professionals, including dotloop. New construction revenue primarily includes advertising services sold to home builders on a cost per residential community basis. Display revenue primarily consists of graphical mobile and web advertising sold to advertisers promoting their brands on our mobile applications and websites.

In our Homes segment, we generate revenue from the resale of homes on the open market through our Zillow Offers program. In April 2018, we announced Zillow Group’s direct purchase and sale of homes through the Zillow Offers program. We began selling homes in July of 2018.

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During the three months ended September 30, 2018, we generated revenue of $343.1 million, as compared to $281.8 million in the three months ended September 30, 2017, an increase of 22%. This increase was primarily the result of a $35.6 million, or 18%, increase in Premier Agent revenue, an $11.0 million increase in Homes revenue, an $8.9 million, or 31%, increase in rentals revenue and an $8.1 million, or 23%, increase in other revenue. This increase was partially offset by a decrease in mortgages revenue of $2.4 million, or 12%, as compared with the three months ended September 30, 2017. There were approximately 186.6 million average monthly unique users of our mobile applications and websites for the three months ended September 30, 2018, representing year-over-year growth of 7%. Visits increased 13% to 1,888.9 million for the three months ended September 30, 2018 from 1,667.1 million for the three months ended September 30, 2017. Net loss for the three months ended September 30, 2018 was $0.5 million, as compared to net income for the three months ended September 30, 2017 of $9.2 million.

On October 31, 2018, we completed the acquisition of Mortgage Lenders of America, L.L.C. (“MLOA”), a national mortgage lender. This acquisition is consistent with our strategy of moving further down funnel and closer to the real estate transaction to create better consumer experiences. The total purchase price for the acquisition of MLOA is approximately $65.0 million in cash. Beginning with the Quarterly Report on Form 10-Q for the quarterly period ending March 31, 2019, Zillow Group expects to report financial results for three reportable segments: the IMT segment, the Homes segment and the Mortgages segment. The IMT segment will include 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 Homes segment will include the financial results from Zillow Group’s buying and selling of homes directly. The Mortgages segment will include the financial results for advertising sold to mortgage lenders and other mortgage professionals, mortgage originations through MLOA and Mortech mortgage software solutions. We expect the Mortgages segment, with the inclusion of MLOA, to have a material impact on our consolidated balance sheets, statements of operations and cash flows in 2019.

On July 3, 2018, we closed underwritten public offerings of (1) 6,557,017 shares of Class C capital stock of Zillow Group, which includes 855,263 shares sold pursuant to the underwriters’ option to purchase additional shares; and (2) $373.8 million aggregate principal amount of Convertible Senior Notes due 2023 (the “2023 Notes”), which includes $48.8 million principal amount of 2023 Notes sold pursuant to the underwriters’ option to purchase additional 2023 Notes. The net proceeds from the offering of Class C capital stock and the issuance of the 2023 Notes were approximately $360.3 million and $364.0 million, respectively, after deducting underwriting discounts and commissions and offering expenses payable by Zillow Group. We used $29.4 million of the net proceeds from the issuance of the 2023 Notes to pay the cost of capped call confirmations. We intend to use the remainder of the net proceeds for general corporate purposes, which may include general and administrative matters and capital expenditures. Additionally, we may choose to use a portion of the net proceeds to expand our current business through acquisitions of, or investments in, other businesses, products or technologies.

As of September 30, 2018, we had 3,809 full-time employees compared to 3,181 full-time employees as of December 31, 2017.

Key Metrics

Management has identified unique users and visits as relevant to investors’ and others’ assessment of our financial condition and results of operations.

Unique Users

Measuring unique users is important to us because much of our Premier Agent, Rentals, Mortgages and other advertising revenue depends in part on our ability to enable real estate, rental and mortgage professionals to connect with our users, our display revenue depends in part on the number of impressions delivered to our users, and our Homes revenue depends in part on users accessing our mobile applications and websites to engage in the sale and purchase of homes with Zillow Group on the open market. Growth in consumer traffic to our mobile applications and websites increases the number of impressions, clicks, leads and other events we can monetize to generate revenue. In addition, our community of users improves the quality of our living database of homes with their contributions, which in turn attracts more users.

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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, HotPads, Naked Apartments and RealEstate.com measure unique users with Google Analytics, and Trulia measures unique users with Adobe Analytics (formerly called Omniture analytical tools). 

	Three Months Ended September 30,		2017 to 2018 % Change
	2018	2017
	(in millions)
Average Monthly Unique Users	186.6	175.2	7	%

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 be transaction-ready real estate market participants and therefore more sought-after by our agent and other real estate professional advertisers or more likely to participate in our Zillow Offers program.

We define a visit as a group of interactions by users with the Zillow, Trulia, StreetEasy and RealEstate.com mobile applications and websites, as we monetize our Premier Agent and Premier Broker products on these 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, StreetEasy and RealEstate.com 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, StreetEasy and RealEstate.com 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.

	Three Months Ended September 30,		2017 to 2018 % Change
	2018	2017
	(in millions)
Visits	1,888.9	1,667.1	13	%

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Basis of Presentation

Revenue

We recognize revenue when (or as) we satisfy our performance obligations by transferring control of promised products or services to our customers in an amount that reflects the consideration to which we expect to be entitled in exchange for those products or services.

In our IMT segment, we generate revenue from the sale of advertising services and our suite of marketing software and technology solutions to businesses and professionals primarily associated with the residential real estate, rental and mortgage industries. These professionals include real estate, rental and mortgage professionals and brand advertisers. Our four primary revenue categories within our IMT segment are Premier Agent, Rentals, Mortgages and Other.

In our Homes segment, we generate revenue from the resale of homes on the open market through our Zillow Offers program.

Premier Agent Revenue. Premier Agent revenue is derived from our Premier Agent and Premier Broker programs. Our Premier Agent and Premier Broker programs offer a suite of marketing and business technology products and services to help real estate agents and brokers achieve their advertising goals, while growing and managing their businesses and brands. All Premier Agents and Premier Brokers receive access to a dashboard portal on our mobile application or website that provides individualized program performance analytics, our customer relationship management, or CRM, tool that captures detailed information about each contact made with a Premier Agent or Premier Broker through our mobile and web platforms and our account management tools. We have concluded that the marketing and business technology products and services promised to Premier Agents and Premier Brokers represent distinct performance obligations.

We offer our Premier Agent and Premier Broker advertising products on a cost per impression basis. Payment is received prior to the delivery of impressions. Impressions are delivered when a sold advertisement appears on pages viewed by users of our mobile applications and websites. We determine the cost per impression delivered in each zip code using an auction-based pricing method in consideration of the total amount spent by Premier Agents and Premier Brokers to purchase impressions in the zip code during the month. A Premier Agent’s or Premier Broker’s share of voice in a zip code is determined by their proportional monthly budgeted spend in that zip code as a percentage of the total monthly budgeted spend of all Premier Agents and Premier Brokers in that zip code. The cost per impression that we charge is dynamic - as demand for impressions in a zip code increases or decreases, the cost per impression in that zip code may be increased or decreased accordingly. The price paid for each impression is representative of the price at which we would sell an impression separately to a customer, or the stand-alone selling price.

We have not allocated the transaction price to each performance obligation as the amounts recognized would be the same irrespective of any allocation. As such, we recognize revenue related to the Premier Agent and Premier Broker products and services based on the contractual spend recognized on a straight-line basis during the contractual period over which the products and services are provided. This methodology best depicts how we satisfy our performance obligations to customers, as we continuously transfer control of the performance obligations to the customer throughout the contractual period.

In April 2018, we began testing a new form of lead validation and distribution related to our auction-based pricing model whereby the share of voice purchased by Premier Agents and Premier Brokers represents both the share of impressions delivered as advertisements appearing on pages viewed by users of our mobile applications and websites, as well as the proportion of validated consumer connections a Premier Agent or Premier Broker receives. When consumers who are interested in connecting with a real estate professional do not select a specific Premier Agent or Premier Broker advertisement on one of Zillow Group’s mobile applications or websites, the validated consumer leads will be distributed to Premier Agents and Premier Brokers in proportion to their share of voice. We believe distributing validated consumer connection leads on the basis of share of voice creates better experiences for consumers and further strengthens our partnerships with real estate professionals. We expect to apply this new form of lead distribution more broadly in the future, with nationwide adoption by the end of 2018.

Rentals Revenue. Rentals revenue includes our rentals marketplace and suite of tools for rental professionals. Rentals revenue primarily includes revenue generated by advertising sold to property managers and other rental professionals on a cost per lead, cost per click or cost per lease generated basis. We recognize revenue as leads or clicks are provided to rental professionals, which is the amount for which we have the right to invoice. The number of leases generated through our rentals marketplace during the period is accounted for as variable consideration, and we estimate these amounts based on the expected number of qualified leases secured during the period. We do not believe that a significant reversal in the amount of cumulative revenue recognized will occur once the uncertainty related to the number of leases secured is subsequently resolved.

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Mortgages Revenue. Mortgages revenue primarily includes marketing products sold to mortgage professionals on a cost per lead basis, including our Custom Quote and a portion of our Connect services, and on a subscription basis, including a portion of our Connect service. For our Connect and Custom Quote cost per lead mortgage marketing products, participating qualified mortgage professionals typically make a prepayment to gain access to consumers interested in connecting with mortgage professionals. Mortgage professionals who exhaust their initial prepayment prepay additional funds to continue to participate in the marketplace. For our Connect subscription mortgage marketing product, participating qualified mortgage professionals generally prepay a monthly subscription fee, which they then allocate to desired geographic counties. In Zillow Group’s Connect platform, consumers answer a series of questions to find a local lender, and mortgage professionals receive consumer contact information, or leads, when the consumer chooses to share their information with a lender. Consumers who request rates for mortgage loans in Custom Quotes are presented with customized quotes from participating mortgage professionals.

For our cost per lead mortgages products, we recognize revenue when a user contacts a mortgage professional through Zillow Group’s mortgages platform, which is the amount for which we have the right to invoice. For our subscription product, the opportunity to receive a consumer contact is based on the mortgage professional’s relative share of voice in a geographic county. When a consumer submits a contact, Zillow Group contacts a group of subscription mortgage professionals via text message, and the first mortgage professional to respond receives the consumer contact information. We recognize revenue based on the contractual spend recognized on a straight-line basis during the contractual period over which the service is provided. This methodology best depicts how we satisfy our performance obligation to subscription customers, as we continuously transfer control of the performance obligation to the customer throughout the contractual period.

Mortgages revenue also includes revenue generated by Mortech, which provides subscription-based mortgage software solutions, including a product and pricing engine and lead management platform, for which we recognize revenue on a straight-line basis during the contractual period over which the services are provided.

Other Revenue. Other revenue primarily includes revenue generated by new construction and display, as well as revenue from the sale of various other marketing and business products and services to real estate professionals. Our new construction marketing solutions allow home builders to showcase their available inventory to home shoppers. New construction revenue primarily includes revenue generated by advertising sold to builders on a cost per residential community basis, and revenue is recognized on a straight-line basis during the contractual period over which the communities are advertised on our mobile applications and websites. Consideration is billed in arrears. Display revenue primarily consists of graphical mobile and web advertising sold on a cost per thousand impressions or cost per click basis to advertisers promoting their brands on our mobile applications and websites. We recognize display revenue as clicks occur or as impressions are delivered to users interacting with our mobile applications or websites, which is the amount for which we have the right to invoice.

Homes Revenue. Homes revenue is derived from the resale of homes on the open market through our Zillow Offers program. Homes revenue is recognized at the time of the closing of the home sale when title to and possession of the property are transferred to the buyer.

Costs and Expenses

Cost of Revenue. For our IMT segment, 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 credit card fees, ad serving costs paid to third parties, revenue-sharing costs related to our commercial business relationships, depreciation expense and costs associated with the operation of our data center and mobile applications and websites. For our Homes segment, our cost of revenue also consists of the consideration paid to acquire, make certain repairs and updates to, and sell each home, including associated overhead costs.

Sales and Marketing. Sales and marketing expenses consist of advertising costs and other sales expenses related to promotional and marketing activities, as well as selling costs, such as commissions, escrow and title fees, staging, and holding costs, such as utilities, taxes and maintenance, related to our Zillow Offers program. Sales and marketing expenses also include headcount expenses, including salaries, commissions, benefits, share-based compensation expense and bonuses for sales, sales support, customer support, marketing and public relations employees, and depreciation expense.

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Technology and Development. Technology and development expenses consist of headcount expenses, including salaries, benefits, share-based compensation expense and bonuses for salaried employees and contractors engaged in the design, development and testing of our mobile applications and websites, and equipment and maintenance costs. 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, and amortization of intangible assets recorded in connection with acquisitions, including developed technology and customer relationships, amongst others. Technology and development expenses also include depreciation expense.

General and Administrative. General and administrative expenses consist of headcount expenses, including salaries, benefits, share-based compensation expense and bonuses 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, legal, accounting and other third-party professional service fees, rent expense, depreciation expense and bad debt expense.

Impairment Costs. Impairment costs consist of non-cash impairment charges incurred.

Acquisition-related Costs. Acquisition-related costs consist of investment banking, legal, accounting, tax, and regulatory filing fees associated with effecting acquisitions.

Integration Costs. Integration costs consist of expenses incurred to incorporate operations, systems, technology, and rights and responsibilities of acquired companies, during both pre-closing and post-closing periods, into Zillow Group’s business. With respect to the impact of the then pending acquisition of MLOA, integration costs primarily include consulting-related expenses incurred in anticipation of the close of the acquisition for the three months ended September 30, 2018.

Other Income

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

Interest Expense

Interest expense consists of interest on Trulia’s Convertible Senior Notes due in 2020 (the “2020 Notes”) we guaranteed in connection with our February 2015 acquisition of Trulia, interest on the Convertible Senior Notes due in 2021 (the “2021 Notes”) we issued in December 2016 and interest on the 2023 Notes we issued in July 2018. Interest is payable on the 2020 Notes at the rate of 2.75% semi-annually on June 15 and December 15 of each year. Interest is payable on the 2021 Notes at the rate of 2.00% semi-annually on June 1 and December 1 of each year. Interest is payable on the 2023 Notes at the rate of 1.50% semi-annually on January 1 and July 1 of each year.

Beginning in August 2018, interest expense includes interest on borrowings, funding fees and other fees, including the amortization of deferred issuance costs, on our revolving credit agreement with Credit Suisse AG, Cayman Islands Branch (the “Revolving Credit Facility”) related to our Zillow Offers business. Borrowings on our Revolving Credit Facility bear interest at a floating rate based on LIBOR plus an applicable margin.

Income Taxes

We are subject to federal and state income taxes in the United States and in Canada. As of September 30, 2018 and December 31, 2017, 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 $1,014.0 million as of December 31, 2017, which are available to reduce future taxable income. We have accumulated state tax losses of approximately $21.4 million (tax effected) as of December 31, 2017.

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On December 22, 2017, the U.S. government enacted comprehensive tax legislation under the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act makes broad and complex changes to the U.S. tax code, including but not limited to: (1) reducing the U.S. federal corporate tax rate from 35 percent to 21 percent; (2) requiring companies to pay a one-time transition tax on certain untaxed earnings of foreign subsidiaries; (3) generally eliminating U.S. federal income taxes on dividends from foreign subsidiaries; (4) eliminating the corporate alternative minimum tax (“AMT”) and how AMT credits are utilized; (5) the additional limitations on deducting executive compensation under IRC Section 162(m); and (6) changing rules related to uses and limitations of net operating loss carryforwards created in tax years beginning after December 31, 2017. Shortly after enactment, implementation guidance was released by the Securities and Exchange Commission that requires a company to reflect the income tax effects of those aspects of the Tax Act for which the accounting under the accounting rules is complete. To the extent that a company’s accounting for certain income tax effects of the Tax Act is incomplete but the company is able to determine a reasonable estimate, it should record a provisional estimate in the financial statements. Further, the implementation guidance also provides for a measurement period that should not extend beyond one year from the Tax Act enactment date for companies to complete their accounting pursuant to the accounting rules.

We recorded an income tax benefit of $14.7 million for the three months ended September 30, 2018, which was calculated as the difference between the income tax benefit of $22.7 million recorded for the nine months ended September 30, 2018 and the income tax benefit of $8.0 million recorded for the six months ended June 30, 2018. The $22.7 million tax benefit recorded for the nine months ended September 30, 2018 is comprised of a $1.9 million income tax benefit, which was calculated using an estimate of our annual effective tax rate of 4.3% applied to our loss before income taxes of $44.9 million for the nine months ended September 30, 2018 and a $20.8 million discrete income tax benefit as a result of the treatment of stock compensation windfall deductions and the impact from the Tax Act related to IRC Section 162(m). Our estimated annual effective tax rate for the nine months ended September 30, 2018 is primarily impacted by the release in valuation allowance resulting from indefinite-lived deferred tax assets and their ability to offset indefinite-lived intangible deferred tax liabilities.

As of September 30, 2018, we have completed our accounting for the income tax effects related to the deduction limitations on compensation under the Tax Act and have recorded a discrete tax benefit adjustment of $3.3 million during the three months ended September 30, 2018. The Internal Revenue Service has provided further guidance in applying the written binding contracts requirement under the Tax Act, and certain of our executive compensation previously eligible to be deductible for tax purposes under Section 162(m) of the Internal Revenue Code will be considered grandfathered and, therefore, will continue to be deductible. Based on the clarification of these rules, the accounting related to the Section 162(m) limitation of the Internal Revenue Code is considered complete and we have recorded a $5.9 million discrete tax benefit adjustment related to this item for the nine months ended September 30, 2018.

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Results of Operations

The following tables present our results of operations for the periods indicated and as a percentage of total revenue:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
	(in thousands, except per share data, unaudited)
Statements of Operations Data:
Revenue:
IMT	$	332,076		$	281,839		$	957,201		$	794,464
Homes	11,018			—			11,018			—
Total revenue	343,094			281,839			968,219			794,464
Cost of revenue (exclusive of amortization) (1)(2):
IMT	26,386			22,152			75,832			62,644
Homes	10,286			—			10,286			—
Total cost of revenue	36,672			22,152			86,118			62,644
Sales and marketing (1)	128,734			107,108			413,752			344,266
Technology and development (1)	105,314			83,389			299,623			234,798
General and administrative (1)	70,743			54,226			187,395			153,038
Impairment costs	10,000			—			10,000			—
Acquisition-related costs	1,405			218			2,064			366
Integration costs	523			—			523			—
Total costs and expenses	353,391			267,093			999,475			795,112
Income (loss) from operations	(10,297		)	14,746			(31,256		)	(648		)
Other income	7,773			1,407			13,308			3,970
Interest expense	(12,668		)	(6,906		)	(26,928		)	(20,526		)
Income (loss) before income taxes	(15,192		)	9,247			(44,876		)	(17,204		)
Income tax benefit (expense)	14,700			(41		)	22,700			(41		)
Net income (loss)	$	(492	)	$	9,206		$	(22,176	)	$	(17,245	)
Net income (loss) per share — basic and diluted	$	—		$	0.05		$	(0.11	)	$	(0.09	)
Weighted-average shares outstanding — basic	202,416			187,692			195,208			185,447
Weighted-average shares outstanding — diluted	202,416			196,425			195,208			185,447
Other Financial Data:
Adjusted EBITDA (3)	$	66,165		$	70,957		$	168,475		$	165,456

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
	(in thousands, unaudited)
(1) Includes share-based compensation as follows:
Cost of revenue	$	969	$	1,014	$	3,180	$	2,942
Sales and marketing	5,911		5,914		17,413		17,694
Technology and development	15,031		10,438		40,920		29,329
General and administrative	19,771		11,208		49,853		34,197
Total	$	41,682	$	28,574	$	111,366	$	84,162
(2) Amortization of website development costs and intangible assets included in technology and development	$	18,165	$	23,537	$	61,735	$	69,957
(3) See “Adjusted EBITDA” below for more information and for a reconciliation of Adjusted EBITDA to net income (loss), the most directly comparable financial measure calculated and presented in accordance with U.S. generally accepted accounting principles, or GAAP.

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	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
	(unaudited)
Percentage of Revenue:
Revenue:
IMT	97	%	100 %		99	%	100	%
Homes	3		0		1		0
Total revenue	100		100		100		100
Cost of revenue (exclusive of amortization):
IMT	8		8		8		8
Homes	3		0		1		0
Total cost of revenue	11		8		9		8
Sales and marketing	38		38		43		43
Technology and development	31		30		31		30
General and administrative	21		19		19		19
Impairment costs	3		0		1		0
Acquisition-related costs	—		—		—		—
Integration costs	—		0		—		0
Total costs and expenses	103		95		103		100
Income (loss) from operations	(3	)	5		(3	)	—
Other income	2		—		1		—
Interest expense	(4	)	(2	)	(3	)	(3	)
Income (loss) before income taxes	(4	)	3		(5	)	(2	)
Income tax benefit (expense)	4		—		2		—
Net income (loss)	—	%	3	%	(2	)%	(2	)%

Adjusted EBITDA

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

We have included Adjusted EBITDA in this Quarterly Report on Form 10-Q as it is a key metric 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 has limitations as an analytical tool, and you should not consider it 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 interest expense or other income;

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• 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 alongside other financial performance measures, including various cash flow metrics, net income (loss) and our other GAAP results.

The following table presents a reconciliation of Adjusted EBITDA to net income (loss) for each of the periods presented:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
	(in thousands, unaudited)
Reconciliation of Adjusted EBITDA to Net Income (Loss):
Net income (loss)	$	(492	)	$	9,206		$	(22,176	)	$	(17,245	)
Other income	(7,773		)	(1,407		)	(13,308		)	(3,970		)
Depreciation and amortization expense	23,375			27,419			76,301			81,576
Share-based compensation expense	41,682			28,574			111,366			84,162
Impairment costs	10,000			—			10,000			—
Acquisition-related costs	1,405			218			2,064			366
Interest expense	12,668			6,906			26,928			20,526
Income tax (benefit) expense	(14,700		)	41			(22,700		)	41
Adjusted EBITDA	$	66,165		$	70,957		$	168,475		$	165,456

Mortgage Lenders of America

As discussed above, Zillow Group completed its acquisition of MLOA on October 31, 2018, and as a result, Zillow Group expects to report financial results for three reportable segments beginning with the Quarterly Report on Form 10-Q for the quarterly period ending March 31, 2019: the IMT segment, the Homes segment and the Mortgages segment. The Mortgages segment will include the financial results for advertising sold to mortgage lenders and other mortgage professionals and Mortech (which together comprise mortgages revenue), and mortgage originations through MLOA. We expect the Mortgages segment, with the inclusion of MLOA, to have a material impact on our consolidated balance sheets, statements of operations and cash flows for 2019. Though we expect the addition of MLOA to contribute to total revenue, we also expect cost of revenue, sales and marketing expense and other costs and expenses will increase. Due to differences between the operational requirements and accounting treatment, among other factors, of mortgage originations through MLOA as compared with our current products and services, historical financial results may not be indicative of future financial performance on a consolidated basis.

Three Months Ended September 30, 2018 Compared to Three Months Ended September 30, 2017

Revenue

The following table presents Zillow Group’s revenue by category for the periods presented (in thousands, unaudited):

	Three Months Ended September 30,				2017 to 2018 % Change
	2018		2017
Premier Agent	$	232,703	$	197,054	18	%
Rentals	37,319		28,438		31	%
Mortgages	18,438		20,869		(12	)%
Other	43,616		35,478		23	%
Homes	11,018		—		N/A
Total revenue	$	343,094	$	281,839	22	%

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The following table presents Zillow Group’s revenue categories as percentages of total revenue for the periods presented (unaudited):

	Three Months Ended September 30,
	2018		2017
Percentage of Total Revenue:
Premier Agent	68	%	70	%
Rentals	11		10
Mortgages	5		7
Other	13		13
Homes	3		—
Total revenue	100	%	100	%

Total revenue increased by $61.3 million, or 22%, for the three months ended September 30, 2018 compared to the three months ended September 30, 2017. There were approximately 186.6 million average monthly unique users of our mobile applications and websites for the three months ended September 30, 2018 compared to 175.2 million average monthly unique users for the three months ended September 30, 2017, representing year-over-year growth of 7%. Visits increased 13% to 1,888.9 million for the three months ended September 30, 2018 from 1,667.1 million for the three months ended September 30, 2017. The increases in unique users and visits increased the number of impressions, leads, clicks and other events we monetized across our revenue categories.

Premier Agent revenue grew to $232.7 million for the three months ended September 30, 2018 from $197.1 million for the three months ended September 30, 2017, an increase of $35.6 million, or 18%. Premier Agent revenue represented 68% and 70% of total revenue, respectively, for the three months ended September 30, 2018 and 2017. Premier Agent revenue was positively impacted by an increase in visits. As discussed above, visits increased 13% to 1,888.9 million for the three months ended September 30, 2018 from 1,677.1 million for the three months ended September 30, 2017. This increase in visits increased the number of impressions we could monetize in our Premier Agent marketplace. Premier Agent revenue per visit increased by 4% to $0.123 for the three months ended September 30, 2018 from $0.118 for the three months ended September 30, 2017. We calculate Premier Agent revenue per visit by dividing the revenue generated by our Premier Agent and Premier Broker programs in the period by the number of visits in the period. We believe Premier Agent revenue was also positively impacted by market forces continuing to take effect within the auction-based pricing method we deployed for our Premier Agent and Premier Broker products in 2016 and 2017, which may have increased demand for our advertising platform.

In April 2018, we began testing a new method of consumer lead validation and distribution to our Premier Agent and Premier Broker advertisers related to our auction-based pricing model. A validated consumer connection is made when a consumer who is interested in connecting with a real estate professional does not select a specific Premier Agent or Premier Broker with whom they want to connect through one of our mobile applications or websites. Applying the new model, these validated consumer leads will be distributed to Premier Agents and Premier Brokers in proportion to their share of voice. With the new method of consumer lead distribution, the share of voice, or an agent advertiser’s share of total advertising purchased in a particular zip code, purchased by Premier Agents and Premier Brokers represents both the share of impressions delivered as advertisements appearing on pages viewed by users of our mobile applications and websites, as well as the proportion of validated consumer connections a Premier Agent or Premier Broker receives. We believe distributing validated consumer connection leads on the basis of share of voice creates better experiences for consumers and further strengthens our partnerships with real estate professionals. We expect to apply this new form of lead validation and distribution more broadly in the future, with nationwide adoption by the end of 2018. The implementation of this lead validation and distribution process has reduced low quality leads and, therefore the total number of leads, delivered to certain Premier Agents and Premier Brokers. We believe this transition to the new lead validation and distribution process will result in increased advertiser churn, or entry to and exit from our advertising platform, in the fourth quarter of 2018 as current and prospective Premier Agents and Premier Brokers evaluate the value of these higher-quality leads and market-based pricing continues to take effect. This churn may negatively impact Premier Agent revenue for the fourth quarter of 2018. We are not able to predict whether this new form of lead validation and distribution will have a material impact on our results beyond 2018.

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In October 2018, we began testing of a new flex pricing model for Premier Broker advertising services in limited markets. With the flex pricing model, select Premier Brokers are provided with validated leads at no upfront cost, and they pay a performance advertising fee only when a real estate transaction is closed with one of their leads. We expect to continue testing of this pricing model in additional regions and may implement it more broadly in the future. These initiatives are part of our continuous evaluation of different pricing and value delivery strategies to better align our revenue opportunities with changes and growth in usage of our mobile and web platforms.

Rentals revenue was $37.3 million for the three months ended September 30, 2018 compared to $28.4 million for the three months ended September 30, 2017, an increase of $8.9 million, or 31%. The increase in rentals revenue was primarily attributable to an increase in the number of average monthly rental listings on our mobile applications and websites, which increased 31% to 40,962 average monthly rental listings for the three months ended September 30, 2018 from 31,374 average monthly rental listings for the three months ended September 30, 2017. Average monthly rental listings include the average monthly monetized, deduplicated rental listings for the period, which are displayed across all of our mobile applications and websites. An increase in rental listings on our mobile applications and websites increases the likelihood that a consumer will contact a rental professional, which in turn increases the likelihood of a lead, click, or lease that we monetize. The quarterly revenue per average monthly rental listing increased 1% to approximately $911 for the three months ended September 30, 2018 from approximately $906 for the three months ended September 30, 2017. We calculate quarterly revenue per average monthly rental listing by dividing total rentals revenue for the period by the average monthly deduplicated rental listings for the period and then dividing by the number of quarters in the period.

Mortgages revenue was $18.4 million for the three months ended September 30, 2018 compared to $20.9 million for the three months ended September 30, 2017, a decrease of $2.4 million, or 12%. The decrease in mortgages revenue was primarily a result of decreased revenue generated by our Connect and Custom Quote services. In 2018, we began testing and implementation of a new consumer lead distribution model in select markets. Following full implementation of the new lead distribution model in the fourth quarter of 2018, we expect to deliver fewer, more transaction-ready consumer connections to our advertising lenders, which we believe will result in a more efficient experience for all participants. We believe the decrease in revenue generated by Connect was primarily a result of the fewer, higher quality consumer leads and other product iterations across our sites which also led to a decrease in leads.

In addition, we believe rising mortgage interest rates in the United States have contributed to a decrease in monetization events, primarily for our Custom Quote service, where we experienced lower refinance lead volumes than expected. We are uncertain how interest rates will impact mortgages revenue in future periods. The number of mortgage loan information requests submitted by consumers increased 13% to 6.3 million for the three months ended September 30, 2018 from 5.5 million mortgage loan information requests submitted by consumers for the three months ended September 30, 2017. This resulted in a 22% decrease in our average revenue per loan information request for the three months ended September 30, 2018 compared to the three months ended September 30, 2017. The growth in loan information requests submitted by consumers increases the likelihood of a monetization event, but there is not a direct correlation between the number of loan information requests and mortgage revenue because loan information requests do not always result in revenue recognition.

We expect mortgages revenue will be positively impacted as a result of our acquisition of MLOA.

Other revenue was $43.6 million for the three months ended September 30, 2018 compared to $35.5 million for the three months ended September 30, 2017, an increase of $8.1 million, or 23%. The increase in other revenue was primarily a result of a 51% increase in revenue generated by our new construction marketing solutions. Growth in new construction revenue was primarily attributable to increases in adoption by and advertising sales to new home builders through our new construction platform.

Homes revenue was $11.0 million for the three months ended September 30, 2018 due to the sale of 36 homes at an average selling price of $306.1 thousand per home.

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Nine Months Ended September 30, 2018 Compared to Nine Months Ended September 30, 2017

Revenue

The following table presents Zillow Group’s revenue by category for the periods presented (in thousands, unaudited):

	Nine Months Ended September 30,				2017 to 2018 % Change
	2018		2017
Premier Agent	$	677,320	$	562,081	21	%
Rentals	99,670		73,693		35	%
Mortgages	56,766		62,075		(9	)%
Other	123,445		96,615		28	%
Homes	11,018		—		N/A
Total revenue	$	968,219	$	794,464	22	%

The following table presents Zillow Group’s revenue categories as percentages of total revenue for the periods presented (unaudited):

	Nine Months Ended September 30,
	2018		2017
Percentage of Total Revenue:
Premier Agent	70	%	71	%
Rentals	10		9
Mortgages	6		8
Other	13		12
Homes	1		—
Total revenue	100	%	100	%

Total revenue increased by $173.8 million, or 22%, for the nine months ended September 30, 2018 compared to the nine months ended September 30, 2017. There were approximately 186.6 million average monthly unique users of our mobile applications and websites for the three months ended September 30, 2018 compared to 175.2 million average monthly unique users for the three months ended September 30, 2017, representing year-over-year growth of 7%. This increase in unique users increased the number of impressions, leads, clicks and other events we monetized across our revenue categories.

Premier Agent revenue grew to $677.3 million for the nine months ended September 30, 2018 from $562.1 million for the nine months ended September 30, 2017, an increase of $115.2 million, or 21%. Premier Agent revenue represented 70% and 71% of total revenue, respectively, for the nine months ended September 30, 2018 and 2017. Premier Agent revenue was positively impacted by an increase in visits. Visits increased 14% to 5,574.3 million for the nine months ended September 30, 2018 from 4,878.8 million for the nine months ended September 30, 2017. This increase in visits increased the number of impressions we could monetize in our Premier Agent marketplace. Premier Agent revenue per visit increased by 5% to $0.122 for the nine months ended September 30, 2018 from $0.115 for the nine months ended September 30, 2017. We believe Premier Agent revenue was also positively impacted by market forces continuing to take effect within the auction-based pricing method we deployed for our Premier Agent and Premier Broker products in 2016 and 2017, which may have increased demand for our advertising platform.

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Rentals revenue was $99.7 million for the nine months ended September 30, 2018 compared to $73.7 million for the nine months ended September 30, 2017, an increase of $26.0 million, or 35%. The increase in rentals revenue was partially attributable to an increase in the number of average monthly rental listings on our mobile applications and websites, which increased 63% to 38,125 average monthly rental listings for the nine months ended September 30, 2018 from 23,340 average monthly rental listings for the nine months ended September 30, 2017. The increase in average monthly rental listings was primarily a result of our monetization of rental listings on our StreetEasy brand mobile application and website beginning in the third quarter of 2017. The quarterly revenue per average monthly rental listing decreased 17% to approximately $871 for the nine months ended September 30, 2018 from approximately $1,052 for the nine months ended September 30, 2017, due primarily to the monetization of rental listings on StreetEasy beginning in the third quarter of 2017, which typically generate less revenue per listing than larger rental properties.

Mortgages revenue was $56.8 million for the nine months ended September 30, 2018 compared to $62.1 million for the nine months ended September 30, 2017, a decrease of $5.3 million, or 9%. The decrease in mortgages revenue was primarily a result of decreased revenue generated by our Connect and Custom Quote services. In 2018, we began testing and implementation of a new consumer lead distribution model in select markets. Following full implementation of the new lead distribution model in the fourth quarter of 2018, we expect to deliver fewer, more transaction-ready consumer connections to our advertising lenders, which we believe will result in a more efficient experience for all participants. We believe the decrease in revenue generated by Connect was primarily a result of the fewer, higher quality consumer leads delivered in connection with our testing and initial implementation of Connect in select markets, and other product iterations across our sites which also led to a decrease in leads.

In addition, we believe rising mortgage interest rates in the United States have contributed to a decrease in monetization events, primarily for our Custom Quote service, where we experienced lower refinance lead volumes than expected. We are uncertain how interest rates will impact mortgages revenue in future periods. The number of mortgage loan information requests submitted by consumers increased 15% to 19.9 million for the nine months ended September 30, 2018 from 17.3 million mortgage loan information requests submitted by consumers for the nine months ended September 30, 2017. This resulted in a 20% decrease in our average revenue per loan information request for the nine months ended September 30, 2018 compared to the nine months ended September 30, 2017. The growth in loan information requests submitted by consumers increases the likelihood of a monetization event, but there is not a direct correlation between the number of loan requests and mortgage revenue because loan information requests do not always result in revenue recognition.

Other revenue was $123.4 million for the nine months ended September 30, 2018 compared to $96.6 million for the nine months ended September 30, 2017, an increase of $26.8 million, or 28%. The increase in other revenue was primarily a result of a 59% increase in revenue generated by our new construction marketing solutions. Growth in new construction revenue was primarily attributable to increases in adoption by and advertising sales to new home builders through our new construction platform.

Homes revenue was $11.0 million for the nine months ended September 30, 2018 due to the sale of 36 homes at an average selling price of $306.1 thousand per home, which sales took place following the launch of Zillow Offers in April 2018.

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Three Months Ended September 30, 2018 Compared to Three Months Ended September 30, 2017

Segment Results of Operations

The following table presents Zillow Group’s segment results for the periods presented (in thousands, unaudited):

	Three Months Ended September 30, 2018									Three Months Ended September 30, 2017
	IMT			Homes			Consolidated			IMT			Homes		Consolidated
Revenue	$	332,076		$	11,018		$	343,094		$	281,839		$	—	$	281,839
Costs and expenses:
Cost of revenue	26,386			10,286			36,672			22,152			—		22,152
Sales and marketing	123,755			4,979			128,734			107,108			—		107,108
Technology and development	99,570			5,744			105,314			83,389			—		83,389
General and administrative	65,156			5,587			70,743			54,226			—		54,226
Impairment costs	10,000			—			10,000			—			—		—
Acquisition-related costs	1,405			—			1,405			218			—		218
Integration costs	523			—			523			—			—		—
Total costs and expenses	326,795			26,596			353,391			267,093			—		267,093
Income (loss) from operations	5,281			(15,578		)	(10,297		)	14,746			—		14,746
Other income	7,773			—			7,773			1,407			—		1,407
Interest expense	(12,236		)	(432		)	(12,668		)	(6,906		)	—		(6,906		)
Income (loss) before income taxes	$	818		$	(16,010	)	$	(15,192	)	$	9,247		$	—	$	9,247

IMT Segment

Cost of Revenue

Cost of revenue was $26.4 million for the three months ended September 30, 2018 compared to $22.2 million for the three months ended September 30, 2017, an increase of $4.2 million, or 19%. The increase in cost of revenue was primarily attributable to a $2.4 million increase in data center and connectivity costs, a $1.1 million increase in credit card and ad serving fees and a $0.4 million increase in headcount-related expenses, including share-based compensation expense. We expect our cost of revenue to increase in absolute dollars in future years as we continue to incur more expenses that are associated with growth in revenue.

Sales and Marketing

Sales and marketing expenses were $123.8 million for the three months ended September 30, 2018 compared to $107.1 million for the three months ended September 30, 2017, an increase of $16.6 million, or 16%. The increase in sales and marketing expenses was primarily attributable to a $10.9 million increase in headcount-related expenses, including share-based compensation expense, due primarily to significant growth in the size of our sales team. The increase in sales and marketing expenses was also attributable to a $2.3 million increase in marketing and advertising expenses, a $1.1 million increase in tradeshows and conferences expense and related travel costs, a $1.0 million increase in consulting costs to support our advertising initiatives, a $0.6 million increase in software and hardware costs, and a $0.7 million increase in miscellaneous expenses. We expect our sales and marketing expenses to increase in absolute dollars in future years as we continue to expand our sales team and invest more resources in extending our audience through marketing and advertising initiatives.

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Technology and Development

Technology and development expenses, which include research and development costs, were $99.6 million for the three months ended September 30, 2018 compared to $83.4 million for the three months ended September 30, 2017, an increase of $16.2 million, or 19%. Approximately $17.2 million of the increase related to growth in headcount-related expenses, including share-based compensation expense, as we continue to grow our engineering teams to support current and future product initiatives. In addition, there was a $2.0 million increase in other non-capitalizable data content expense, a $1.1 million increase in professional services, a $0.6 million increase in software and hardware costs and a $0.5 million increase in miscellaneous expenses, partially offset by a $5.2 million decrease in depreciation and amortization expense.

Other data content expense was $12.1 million and $10.1 million, respectively, for the three months ended September 30, 2018 and 2017. Amortization expense included in technology and development related to intangible assets recorded in connection with acquisitions was $8.2 million and $9.8 million, respectively, for the three months ended September 30, 2018 and 2017. Amortization expense included in technology and development for capitalized website development costs and software was $7.4 million and $11.2 million, respectively, for the three months ended September 30, 2018 and 2017. Amortization expense included in technology and development for purchased data content intangible assets was $2.5 million for the three months ended September 30, 2018 and 2017. We expect our technology and development expenses to increase in absolute dollars over time as we continue to build new mobile and website functionality and develop new technologies.

General and Administrative

General and administrative expenses were $65.2 million for the three months ended September 30, 2018 compared to $54.2 million for the three months ended September 30, 2017, an increase of $10.9 million, or 20%. The increase in general and administrative expenses was primarily due to an $11.5 million increase in headcount-related expenses, including share-based compensation expense, driven primarily by growth in headcount in shared corporate services to support our engineering and other teams, a $1.6 million increase in software and hardware costs, a $0.9 million increase in professional services, a $0.8 million increase in miscellaneous expenses, partially offset by a $3.4 million decrease in estimated legal liabilities and a $0.5 million decrease in bad debt expense. We expect general and administrative expenses to increase over time in absolute dollars as we continue to expand our business.

Impairment Costs

Impairment costs for the three months ended September 30, 2018 consisted of the $10.0 million non-cash impairment related to our June 2017 equity investment. For additional information about the impairment, see Note 9 to our condensed consolidated financial statements. There were no impairment costs for the three months ended September 30, 2017.

Acquisition-Related Costs

Acquisition-related costs were $1.4 million for the three months ended September 30, 2018 and related to our acquisition of MLOA. Acquisition-related costs were $0.2 million for the three months ended September 30, 2017, primarily due to our September 2017 acquisition of New Home Feed.

Integration Costs

Integration costs were $0.5 million for the three months ended September 30, 2018 and primarily consisted of professional consulting service fees. There were no integration costs for the three months ended September 30, 2017.

Interest Expense

Interest expense was $12.2 million for the three months ended September 30, 2018, compared to $6.9 million for the three months ended September 30, 2017.

For the three months ended September 30, 2018, interest expense primarily related to the 2021 Notes and the 2023 Notes. As a result of the issuance of the 2023 Notes on July 3, 2018, we expect that our interest expense for the IMT segment will increase in future periods related to the contractual coupon interest and amortization of debt discount and debt issuance costs that will be recognized in interest expense.

For the three months ended September 30, 2017, interest expense primarily related to the 2021 Notes.

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For additional information regarding the 2021 Notes and the 2023 Notes, see Note 12 to our condensed consolidated financial statements.

Homes Segment

Cost of Revenue

Cost of revenue was $10.3 million for the three months ended September 30, 2018. Cost of revenue was primarily attributable to home acquisition and renovation costs related to the 36 homes that we sold during the period. We expect cost of revenue to increase in absolute dollars in future years as we continue to incur more expenses that are associated with growth in revenue and expansion of Zillow Offers into new markets.

Sales and Marketing

Sales and marketing expenses were $5.0 million for the three months ended September 30, 2018. Sales and marketing expenses were primarily attributable to $3.1 million in headcount-related expenses, including share-based compensation expense, $0.5 million of holding costs, $0.5 million of selling expenses directly attributable to the resale of homes and $0.9 million in miscellaneous expenses. We expect our sales and marketing expenses to increase in absolute dollars in future periods as we continue to expand the Homes segment.

Technology and Development

Technology and development expenses, which include research and development costs, were $5.7 million for the three months ended September 30, 2018. Technology and development expenses were primarily due to $5.3 million in headcount-related expenses, including share-based compensation expense, as we continue to grow our teams to support the Homes segment. We expect our technology and development expenses to increase in absolute dollars in future periods as we continue to build new website functionality and other technologies that will facilitate the purchasing and sales processes related to our Homes segment.

General and Administrative

General and administrative expenses were $5.6 million for the three months ended September 30, 2018. General and administrative expenses were primarily due to $4.3 million in headcount-related expenses, including share-based compensation expense, as we continue to grow our teams to support the Homes segment. In addition, we incurred $0.5 million in building lease-related expenses including rent, utilities and insurance, and $0.8 million in miscellaneous expenses. We expect general and administrative expenses to increase in absolute dollars in future periods as we continue to expand our Homes business.

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Nine Months Ended September 30, 2018 Compared to Nine Months Ended September 30, 2017

Segment Results of Operations

The following table presents Zillow Group’s segment results for the periods presented (in thousands, unaudited):

	Nine Months Ended September 30, 2018									Nine Months Ended September 30, 2017
	IMT			Homes			Consolidated			IMT			Homes		Consolidated
Revenue	$	957,201		$	11,018		$	968,219		$	794,464		$	—	$	794,464
Costs and expenses:
Cost of revenue	75,832			10,286			86,118			62,644			—		62,644
Sales and marketing	405,525			8,227			413,752			344,266			—		344,266
Technology and development	286,983			12,640			299,623			234,798			—		234,798
General and administrative	172,756			14,639			187,395			153,038			—		153,038
Impairment costs	10,000			—			10,000			—			—		—
Acquisition-related costs	2,064			—			2,064			366			—		366
Integration costs	523			—			523			—			—		—
Total costs and expenses	953,683			45,792			999,475			795,112			—		795,112
Income (loss) from operations	3,518			(34,774		)	(31,256		)	(648		)	—		(648		)
Other income	13,308			—			13,308			3,970			—		3,970
Interest expense	(26,496		)	(432		)	(26,928		)	(20,526		)	—		(20,526		)
Loss before income taxes	$	(9,670	)	$	(35,206	)	$	(44,876	)	$	(17,204	)	$	—	$	(17,204	)

IMT Segment

Cost of Revenue

Cost of revenue was $75.8 million for the nine months ended September 30, 2018 compared to $62.6 million for the nine months ended September 30, 2017, an increase of $13.2 million, or 21%. The increase in cost of revenue was primarily attributable to a $6.5 million increase in data center and connectivity costs, a $4.7 million increase in credit card and ad serving fees and a $1.7 million increase in headcount-related expenses, including share-based compensation expense.

Sales and Marketing

Sales and marketing expenses were $405.5 million for the nine months ended September 30, 2018 compared to $344.3 million for the nine months ended September 30, 2017, an increase of $61.3 million, or 18%. The increase in sales and marketing expenses was primarily attributable to increased headcount-related expenses of $27.1 million, including share-based compensation expense, due primarily to significant growth in the size of our sales team.

In addition to the increases in headcount-related expenses, marketing and advertising expenses increased $23.9 million, primarily related to advertising spend to attract consumers across online and offline channels, which supports our growth initiatives. The increase in sales and marketing expenses was also attributable to a $4.1 million increase in tradeshows and conferences expense and related travel costs, a $2.5 million increase in consulting costs to support our advertising initiatives, a $1.1 million increase in depreciation expense, a $1.1 million increase in software and hardware costs, and a $1.5 million increase in miscellaneous expenses.

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Technology and Development

Technology and development expenses, which include research and development costs, were $287.0 million for the nine months ended September 30, 2018 compared to $234.8 million for the nine months ended September 30, 2017, an increase of $52.2 million, or 22%. Approximately $47.5 million of the increase related to growth in headcount-related expenses, including share-based compensation expense, as we continue to grow our engineering teams to support current and future product initiatives. In addition, there was a $7.9 million increase in other non-capitalizable data content expense, a $2.3 million increase in professional services fees, a $1.0 million increase in software and hardware costs and a $1.2 million increase in miscellaneous expenses, partially offset by a $7.7 million decrease in depreciation and amortization expense.

Other data content expense was $33.7 million and $25.8 million, respectively, for the nine months ended September 30, 2018 and 2017. Amortization expense included in technology and development for capitalized website development costs and software was $28.0 million and $33.0 million, respectively, for the nine months ended September 30, 2018 and 2017. Amortization expense included in technology and development related to intangible assets recorded in connection with acquisitions was $26.0 million and $29.5 million, respectively, for the nine months ended September 30, 2018 and 2017. Amortization expense included in technology and development for purchased data content intangible assets was $7.5 million for the nine months ended September 30, 2018 and 2017.

General and Administrative

General and administrative expenses were $172.8 million for the nine months ended September 30, 2018 compared to $153.0 million for the nine months ended September 30, 2017, an increase of $19.7 million, or 13%. The increase in general and administrative expenses was primarily due to a $22.6 million increase in headcount-related expenses, including share-based compensation expense, driven primarily by growth in headcount in shared corporate services to support our engineering and other teams, a $6.3 million increase in software and hardware costs, a $2.8 million increase in travel and meals expense, a $1.6 million increase in building lease-related expenses including rent, utilities and insurance, a $1.4 million increase in city and state taxes and a $0.9 million increase in professional services fees, partially offset by a $10.6 million decrease in estimated legal liabilities and a $4.8 million decrease in bad debt expense.

Impairment Costs

Impairment costs for the nine months ended September 30, 2018 consisted of the $10.0 million non-cash impairment related to our June 2017 equity investment. For additional information about the impairment, see Note 9 to our condensed consolidated financial statements. There were no impairment costs for the nine months ended September 30, 2017.

Acquisition-Related Costs

Acquisition-related costs were $2.1 million for the nine months ended September 30, 2018 and related to our acquisition of MLOA. Acquisition-related costs were $0.4 million for the nine months ended September 30, 2017, primarily due to our January 2017 acquisition of Hamptons Real Estate Online, now Out East, and our September 2017 acquisition of New Home Feed.

Integration Costs

Integration costs were $0.5 million for the nine months ended September 30, 2018 and primarily consisted of professional consulting services fees. There were no integration costs for the nine months ended September 30, 2017.

Interest Expense

Interest expense was $26.5 million for the nine months ended September 30, 2018, compared to $20.5 million for the nine months ended September 30, 2017.

For the nine months ended September 30, 2018, interest expense primarily related to the 2021 Notes. Beginning in July 2018, interest expense also related to the 2023 Notes that were issued on July 3, 2018.

For the nine months ended September 30, 2017, interest expense primarily related to the 2021 Notes.

For additional information regarding the 2021 Notes and the 2023 Notes, see Note 12 to our condensed consolidated financial statements.

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Homes Segment

Cost of Revenue

Cost of revenue was $10.3 million for the nine months ended September 30, 2018. Cost of revenue was primarily attributable to home acquisition and renovation costs related to the 36 homes that we sold during the period.

Sales and Marketing

Sales and marketing expenses were $8.2 million for the nine months ended September 30, 2018. Sales and marketing expenses were primarily attributable to $5.5 million in headcount-related expenses, including share-based compensation expense, $0.6 million in tradeshows and conferences expense and related travel costs, $0.5 million of holding costs, $0.5 million of selling expenses directly attributable to the resale of homes and $0.5 million of marketing and advertising expenses.

Technology and Development

Technology and development expenses, which include research and development costs, were $12.6 million for the nine months ended September 30, 2018. Technology and development expenses were primarily due to $11.9 million in headcount-related expenses, including share-based compensation expense, as we continue to grow our teams to support the Homes segment.

General and Administrative

General and administrative expenses were $14.6 million for the nine months ended September 30, 2018. General and administrative expenses were primarily due to $11.7 million in headcount-related expenses, including share-based compensation expense, as we continue to grow our teams to support the Homes segment. In addition, we incurred $1.4 million in building lease-related expenses including rent, utilities and insurance, and $1.5 million in miscellaneous expenses.

Liquidity and Capital Resources

As of September 30, 2018 and December 31, 2017, we had cash and cash equivalents, investments and restricted cash of $1,646.2 million and $762.5 million, respectively. Cash and cash equivalents balances consist of operating cash on deposit with financial institutions, money market funds, corporate notes and bonds, commercial paper, U.S. government agency securities and certificates of deposit with original maturities of three months or less. Investments consist of fixed income securities, which include U.S. government agency securities, corporate notes and bonds, commercial paper, municipal securities, foreign government securities and certificates of deposit. Restricted cash consists of amounts funded to the reserve and collection accounts related to our Revolving Credit Facility (described below). Amounts on deposit with third-party financial institutions exceed the Federal Deposit Insurance Corporation and the Securities Investor Protection Corporation insurance limits, as applicable. 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 implementation and expansion of Zillow Group’s purchase of homes in the Zillow Offers program and sale of homes on the open market will likely have a significant impact on our liquidity and capital resources as a cash and inventory intensive initiative. During the second quarter of 2018, we used cash from our balance sheet to fund the purchases of homes and related costs. Beginning in the third quarter of 2018, we use debt financing to fund a portion of the purchase price of homes and certain related costs. On July 31, 2018, certain wholly owned subsidiaries of Zillow Group entered into a revolving credit agreement with Credit Suisse AG, Cayman Islands Branch, as the directing lender, and certain other parties thereto (the “Revolving Credit Facility”). The Revolving Credit Facility provides for a maximum borrowing capacity of $250.0 million (the “Maximum Amount”) with a current borrowing capacity of $25.0 million as of September 30, 2018, which amount may be increased up to the Maximum Amount subject to the satisfaction of certain conditions, through a non-recourse credit facility secured by a pledge of the equity of certain Zillow Group subsidiaries that purchase and sell select residential properties through Zillow Offers. The Revolving Credit Facility has an initial term of one year which may be extended for up to three years, subject to agreement by the directing lender. Beginning in August 2018, we incurred interest on borrowings on the Revolving Credit Facility at a floating rate based on LIBOR, plus an applicable margin. The Revolving Credit Facility includes customary representations and warranties, covenants (including financial covenants applicable to the Company), and provisions regarding events of default. For additional information regarding the Revolving Credit Facility, see Note 12 to our condensed consolidated financial statements.

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The October 31, 2018 acquisition of MLOA will likely have a significant impact on our liquidity and capital resources as a cash intensive business as it relates to funding mortgage loans originated for resale in the secondary market. In conjunction with the acquisition of MLOA, we acquired two warehouse lines of credit which we expect to use to fund mortgage loans originated by MLOA post-closing.

We have outstanding $9.6 million aggregate principal of 2020 Notes as of September 30, 2018. The 2020 Notes were guaranteed by Zillow Group in connection with our February 2015 acquisition of Trulia, Inc. The aggregate principal amount of the 2020 Notes is due on December 15, 2020 if not earlier converted or redeemed. The 2020 Notes are convertible into shares of Zillow Group Class A common stock. Interest is payable on the 2020 Notes at the rate of 2.75% semi-annually on June 15 and December 15 of each year. Holders of the 2020 Notes may convert all or any portion of their notes, in multiples of $1,000 principal amount, at their option at any time prior to the close of business on the business day immediately preceding the maturity date. The 2020 Notes are redeemable, at our option, in whole or in part on or after December 20, 2018, under certain circumstances. For additional information regarding the 2020 Notes, see Note 12 to our condensed consolidated financial statements.

In December 2016, Zillow Group issued $460.0 million aggregate principal amount of 2021 Notes. The 2021 Notes bear interest at a fixed rate of 2.00% per year, payable semiannually in arrears on June 1 and December 1 of each year. The 2021 Notes are convertible into cash, shares of our Class C capital stock or a combination thereof, at the Company’s election. The 2021 Notes will mature on December 1, 2021, unless earlier repurchased, redeemed, or converted in accordance with their terms. Prior to the close of business on the business day immediately preceding September 1, 2021, the 2021 Notes are convertible at the option of the holders of the 2021 Notes only under certain conditions, none of which conditions have been satisfied as of September 30, 2018. On or after September 1, 2021, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders of the 2021 Notes may convert their 2021 Notes at their option at the conversion rate then in effect, irrespective of these conditions. The Company will settle conversions of the 2021 Notes by paying or delivering, as the case may be, cash, shares of Class C capital stock, or a combination of cash and shares of Class C capital stock, at its election. The Company may redeem for cash all or part of the 2021 Notes, at its option, on or after December 6, 2019, under certain circumstances at a redemption price equal to 100% of the principal amount of the 2021 Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date (as defined in the indenture governing the 2021 Notes). For additional information regarding the 2021 Notes, see Note 12 to our condensed consolidated financial statements.

On July 3, 2018, we closed underwritten public offerings of (1) 6,557,017 shares of Class C capital stock of Zillow Group, which includes 855,263 shares sold pursuant to the underwriters’ option to purchase additional shares; and (2) $373.8 million aggregate principal amount of Convertible Senior Notes due 2023 (the “2023 Notes”), which includes $48.8 million principal amount of 2023 Notes sold pursuant to the underwriters’ option to purchase additional 2023 Notes. The net proceeds from the offering of Class C capital stock and the issuance of the 2023 Notes were $360.3 million and $364.0 million, respectively, after deducting underwriting discounts and commissions and offering expenses payable by Zillow Group. We used $29.4 million of the net proceeds from the issuance of the 2023 Notes to pay the cost of capped call confirmations. We intend to use the remainder of the net proceeds for general corporate purposes, which may include general and administrative matters and capital expenditures. Additionally, we may choose to use a portion of the net proceeds to expand our current business through acquisitions of, or investments in, other businesses, products or technologies.

The 2023 Notes bear interest at a fixed rate of 1.50% per year, payable semiannually in arrears on January 1 and July 1 of each year, beginning on January 1, 2019. Beginning in July 2018, interest expense included interest on the 2023 Notes. The 2023 Notes are convertible into cash, shares of Class C capital stock or a combination thereof, at the Company’s election. The 2023 Notes will mature on July 1, 2023, unless earlier repurchased, redeemed, or converted in accordance with their terms. Prior to the close of business on the business day immediately preceding April 1, 2023, the 2023 Notes are convertible at the option of the holders only under certain conditions. On or after April 1, 2023, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their 2023 Notes at their option at the conversion rate then in effect, irrespective of these conditions. The Company will settle conversions of the 2023 Notes by paying or delivering, as the case may be, cash, shares of the Company’s Class C capital stock, or a combination of cash and shares of Class C capital stock, at its election. The conversion rate will initially be 12.7592 shares of Class C capital stock per $1,000 principal amount of 2023 Notes (equivalent to an initial conversion price of approximately $78.37 per share of Class C capital stock). The conversion rate is subject to customary adjustments upon the occurrence of certain events. The Company may redeem for cash all or part of the 2023 Notes, at its option, on or after July 6, 2021, under certain circumstances at a redemption price equal to 100% of the principal amount of the 2023 Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date (as defined in the indenture governing the 2023 Notes).

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The following table presents selected cash flow data for the periods presented:

	Nine Months Ended September 30,
	2018			2017
	(in thousands, unaudited)
Cash Flow Data:
Net cash provided by operating activities	$	102,543		$	176,923
Net cash used in investing activities	(641,824		)	(180,246		)
Net cash provided by financing activities	834,181			79,673

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. Our primary uses of cash from operating activities include payments for marketing and advertising activities, homes purchased through Zillow Offers 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.

For the nine months ended September 30, 2018, net cash provided by operating activities was $102.5 million. This was primarily driven by a net loss of $22.2 million, adjusted by share-based compensation expense of $111.4 million, depreciation and amortization expense of $76.3 million, amortization of contract cost assets of $27.2 million, a non-cash change in our deferred income taxes of $22.7 million, amortization of the discount and issuance costs on the 2021 Notes and 2023 Notes of $18.0 million, a non-cash impairment charge of $10.0 million, a change in deferred rent of $3.1 million, and a loss on disposal of property and equipment of $3.1 million. Changes in operating assets and liabilities decreased cash provided by operating activities by $94.4 million. The changes in operating assets and liabilities are primarily due to a $43.3 million increase in inventory due to the purchase of homes through Zillow Offers, a $32.1 million increase in contract cost assets due primarily to the capitalization of sales commissions, a $15.0 million increase in prepaid expenses and other assets driven primarily by the timing of payments, a $13.0 million increase in accounts receivable due primarily to an increase in revenue, and a $6.5 million increase in accrued compensation and benefits driven primarily by the timing of payments.

For the nine months ended September 30, 2017, net cash provided by operating activities was $176.9 million. This was primarily driven by a net loss of $17.2 million, adjusted by depreciation and amortization expense of $81.6 million, share-based compensation expense of $84.2 million, amortization of the discount and issuance costs on the 2021 Notes of $13.4 million, an increase in bad debt expense of $5.9 million, a loss on disposal of property and equipment of $4.1 million, and a change in deferred rent of $3.1 million. Changes in operating assets and liabilities increased cash provided by operating activities by $1.6 million. The changes in operating assets and liabilities are primarily due to a $19.3 million increase in accounts receivable due primarily to an increase in revenue, a $13.2 million increase in accrued expenses and other current liabilities, and a $4.4 million decrease in prepaid expenses and other assets driven primarily by the timing of payments.

Cash Flows Used In Investing Activities

Our primary investing activities include the purchase and sale or maturity of investments, the purchase of property and equipment and intangible assets, and cash paid in connection with acquisitions.

For the nine months ended September 30, 2018, net cash used in investing activities was $641.8 million. This was primarily the result of $587.2 million of net purchases of investments in connection with investment of a portion of the net proceeds from our July 2018 public offerings of Class C capital stock and 2023 Notes, and $52.7 million of purchases for property and equipment and intangible assets.

For the nine months ended September 30, 2017, net cash used in investing activities was $180.2 million. This was primarily the result of $98.7 million of net purchases of investments, $61.0 million of purchases for property and equipment and intangible assets, approximately $11.1 million paid in connection with acquisitions, and $10.0 million related to the purchase of an equity investment, partially offset by $0.6 million in proceeds from our August 2016 sale of our Diverse Solutions business.

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Cash Flows Provided By Financing Activities

Net cash provided by financing activities has, in the past, primarily resulted from the exercise of employee option awards and equity awards withheld for tax liabilities, and for the nine months ended September 30, 2018, also includes net proceeds from the issuance of the 2023 Notes, premiums paid for Capped Call Confirmations, net proceeds from our Class C capital stock public offering, and proceeds from borrowing on our Revolving Credit Facility.

For the nine months ended September 30, 2018, net cash provided by financing activities was approximately $834.2 million, which was primarily related to net proceeds from the issuance of the 2023 Notes of $364.0 million, net proceeds from the public offering of our Class C capital stock of $360.3 million, proceeds from the exercise of option awards of $114.6 million, partially offset by approximately $29.4 million paid in premiums for certain Capped Call Confirmations in July 2018, and proceeds from borrowing on our Revolving Credit Facility of $24.7 million.

For the nine months ended September 30, 2017, our financing activities primarily related to the exercise of employee option awards. The proceeds from the exercise of option awards for the nine months ended September 30, 2017 was $80.0 million.

Off-Balance Sheet Arrangements

We did not have any off-balance sheet arrangements other than outstanding surety bonds issued for our benefit of approximately $3.5 million as of September 30, 2018. 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 17 to our condensed consolidated financial statements 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, 2017, except for an operating lease obligation disclosed in our Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2018, and the contractual obligations listed below as of September 30, 2018:

	Payments Due By Period
	Total		Less Than 1 Year		1-3 Years		3-5 Years		More Than 5 Years
	(in thousands, unaudited)
2023 Notes (1)	$	373,750	$	—	$	—	$	373,750	$	—
Interest on 2023 Notes (2)	28,017		5,591		11,213		11,213		—
Homes under contract (3)	30,269		30,269		—		—		—
Revolving credit facility (4)	24,674		24,674		—		—		—
Total contractual obligations	$	456,710	$	60,534	$	11,213	$	384,963	$	—
____________________ (1) The aggregate principal amount of the 2023 Notes is due on July 1, 2023, if not earlier converted or redeemed. (2) The stated interest rate on the 2023 Notes is 1.50%. (3) We have obligations to purchase homes under contract through our Zillow Offers business. (4) Includes principal amounts due for amounts borrowed under the Revolving Credit Facility entered into on July 31, 2018. Amount exclude an immaterial amount of estimated interest payments.

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 $3.5 million as of September 30, 2018.

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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 and assumptions that affect the reported amounts of assets, liabilities, revenue, expenses and related disclosures. We evaluate our estimates 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. For information on our critical accounting policies and estimates, see Part I, Item 2 (Management’s Discussion and Analysis of Financial Condition and Results of Operations) of our Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2018. There have been no material changes to our critical accounting policies and estimates as previously disclosed in our Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2018.

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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, certificates of deposit, U.S. government agency securities, commercial paper, foreign government securities, municipal securities, and corporate notes and bonds. 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.

As of September 30, 2018, we have outstanding $373.8 million aggregate principal Convertible Senior Notes due in 2023 (the “2023 Notes”), $460.0 million aggregate principal Convertible Senior Notes due in 2021 (the “2021 Notes”) and $9.6 million aggregate principal Convertible Senior Notes due in 2020 (the “2020 Notes”). The 2023 Notes were issued in July 2018 and carry a fixed interest rate of 1.50% per year. The 2021 Notes were issued in December 2016 and carry a fixed interest rate of 2.00% per year. The 2020 Notes were guaranteed by Zillow Group in connection with our February 2015 acquisition of Trulia, Inc. and carry a fixed interest rate of 2.75% per year.

Since the 2023 Notes, 2021 Notes, and 2020 Notes bear interest at fixed rates, we have no direct financial statement risk associated with changes in interest rates as of September 30, 2018. However, the fair values of the 2023 Notes, 2021 Notes, and 2020 Notes change primarily when the market price of our stock fluctuates or interest rates change.

We are subject to market risk by way of changes in interest rates on borrowings under our revolving credit agreement with Credit Suisse AG, Cayman Islands Branch, which we entered into on July 31, 2018 (the “Revolving Credit Facility”). As of September 30, 2018, we have outstanding $24.7 million of borrowings on the Revolving Credit Facility. Borrowings on our Revolving Credit Facility bear interest at a floating rate based on the one-month London Interbank Offered Rate (“LIBOR”) plus an applicable margin. Accordingly, fluctuations in market interest rates may increase or decrease our interest expense. Assuming no change in the outstanding borrowings on the Revolving Credit Facility, we estimate that a 100 basis point increase in LIBOR would increase our annual interest expense by approximately $0.2 million.

The October 31, 2018 acquisition of Mortgage Lenders of America, L.L.C. (“MLOA”) is expected to have a significant future impact on our exposure to interest rate risk. We will be exposed to interest rate risk associated with our mortgage loan origination services which we will manage through the use of forward sales of mortgage-backed securities. In conjunction with the acquisition of MLOA, we acquired two warehouse lines of credit which we expect to use to fund mortgage loans originated by MLOA post-closing. The warehouse lines of credit bear interest at a floating rate based on LIBOR, plus an applicable margin.

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.

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 Interim Chief Financial Officer, evaluated the effectiveness of the Company’s disclosure controls and procedures pursuant to Exchange Act Rule 13a-15(b) as of September 30, 2018. Based on that evaluation, the Chief Executive Officer and the Interim Chief Financial Officer concluded that these disclosure controls and procedures were effective as of September 30, 2018.

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 September 30, 2018 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 17 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

Our business is subject to numerous risks. You should carefully consider the following risk factors, as any of these risks could harm our business, results of operations, and future financial performance. Recovery pursuant to our insurance policies may not be available due to policy definitions of covered losses or other factors, and available insurance may be insufficient to compensate for damages, expenses, fines, penalties, and other losses we may incur as a result of these and other risks. In addition, risks and uncertainties not currently known to us or that we currently deem to be immaterial may materially adversely affect our business, financial condition and operating results. If any of these risks occur, the trading price of our common and capital stock could decline, and you could lose all or part of your investment. The following is an update to the risk factors set forth in Part II, Item 1A (Risk Factors) in our Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2018.

Risks Related to Our Business and Industry

If Real Estate, Rental and Mortgage Professionals, Home Builders or Other Advertisers Reduce or End Their Advertising Spending With Us or if We Are Unable to Effectively Manage Advertising Inventory or Pricing, Our Business Would Be Harmed.

Our current financial model depends on revenue generated primarily through sales of advertising products and services to real estate agents and brokerages, rental professionals, mortgage professionals, home builders, and other advertisers in categories relevant to real estate. Our ability to attract and retain advertisers, and ultimately to generate advertising revenue, depends on a number of factors, including how successfully we can:

• increase the number of consumers who use our products and services, provide them with tools to promote engagement between real estate market participants, and enhance their user experience so we can retain them;

• offer an attractive return on investment to our advertisers for their advertising spending with us;

• continue to develop our advertising products and services to increase adoption by and engagement with advertising customers;

• keep pace with and anticipate changes in technology to provide industry-leading products and services to advertisers and consumers; and

• compete effectively for advertising dollars with other online media companies.

Premier Agent revenue, derived from our Premier Agent and Premier Broker programs, accounted for 68% of total revenue for the three months ended September 30, 2018. This level of revenue concentration suggests that even modest decreases in individual agent advertiser spending across the advertiser population, caused by actual or perceived decreases to return on investment, preference for a competitive service, or other factors, could have a significant negative impact on our results of operations. We do not have long-term contracts with most of our advertisers. Our advertisers could choose to modify or discontinue their relationships with us with little or no advance notice. For example, our self-serve account interface for Premier Agent advertisers allows agent advertisers to independently control the duration of their advertising commitments. We may not succeed in retaining existing advertisers’ spending or capturing a greater share of such spending if we are unable to convince advertisers of the effectiveness or superiority of our products as compared to alternatives, including traditional offline advertising media such as television and newspapers. In addition, we continually evaluate and utilize various pricing and value delivery strategies in order to better align our revenue opportunities with the growth in usage of our mobile and web platforms. In 2016, for example, we implemented a new auction-based pricing method for our Premier Agent products, and in the second quarter of 2018, we began testing a new form of lead validation and distribution related to our auction-based pricing model whereby the share of voice purchased by Premier Agents and Premier Brokers represents both the share of impressions delivered as advertisements appearing on pages viewed by users of our mobile applications and websites, as well as the proportion of validated consumer connections a Premier Agent or Premier Broker receives. Future changes to our pricing or lead delivery methodologies for advertising services or product offerings may cause advertisers to reduce or end their advertising with us or negatively impact our ability to manage revenue opportunities. If advertisers reduce or end their advertising spending with us, or if we are unable to effectively manage inventory and pricing, our advertising revenue and business, results of operations and financial condition would be harmed.

If We Do Not Innovate or Provide High-Quality Products and Services on Mobile and the Web That Are Attractive to Our Users and to Our Advertisers, Our Business Could Be Harmed.

Our success depends on our continued innovation to provide new, and improve upon existing, products and services that make our mobile applications, websites and other tools useful for consumers and real estate, rental and mortgage professionals, and attractive to our advertisers. As a result, we must continually invest significant resources in research and development to improve the attractiveness and comprehensiveness of our products and services, adapt to changes in technology, and support new devices and operating systems. If we are unable to provide products and services that users, including real estate

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professionals, want to use, on the devices they prefer, then users may become dissatisfied and use competitors’ mobile applications, websites and tools. If consumers begin to access real estate through other media and we fail to innovate, our business may be negatively impacted. If we are unable to continue offering high-quality, innovative products and services, we may be unable to attract additional users and advertisers or retain our current users and advertisers, which could harm our business, results of operations and financial condition.

We Face Competition for Consumers in the Real Estate Category, Which Could Impair Our Ability to Attract Users of Our Mobile Applications and Websites, Which Would Harm Our Business, Results of Operations and Financial Condition.

Our business model depends on our ability to continue to attract consumers to our mobile applications and websites and enhance their engagement with our products and services in a cost-effective manner. New entrants continue to join the category at an increasingly rapid pace. Our existing and potential competitors include companies that operate, or could develop, national and local real estate, rental, new construction and mortgage mobile applications and websites. Such competitors range from companies offering traditional offline advertising media, like newspapers, to new mobile- or web-only technology companies. These companies could devote greater financial, technical and other resources than we have available to sales, advertising, or research and development, have a more accelerated time frame for deployment, or leverage their existing user bases and proprietary technologies to provide products and services that consumers might view as superior to our offerings. Any of our future or existing competitors may introduce different solutions that attract consumers or provide solutions similar to our own but with better branding or marketing resources. If we are not able to continue to attract consumers to our mobile applications and websites, our business, results of operations and financial condition would be harmed.

We May Not Be Able to Compete Successfully Against Our Existing or Future Competitors in Attracting Advertisers, Which Could Harm Our Business, Results of Operations and Financial Condition.

We face intense competition from traditional and online or mobile media sources to attract advertisers. Online and on mobile, we compete against websites dedicated to providing real estate, rental, new construction, and mortgage information and services to real estate professionals and consumers, major internet portals, general search engines, e-commerce, and social media sites, as well as other technology and media companies. We also compete for a share of advertisers’ overall marketing budgets with traditional media such as television, magazines, newspapers and home/apartment guide publications, particularly with respect to advertising dollars spent at the local level by real estate professionals to advertise their qualifications and listings. Large companies with significant brand recognition have large numbers of direct sales personnel and substantial proprietary advertising inventory and web traffic, which may provide a competitive advantage. To compete successfully for advertisers against future and existing competitors, we must continue to invest resources in developing our advertising platform and proving the effectiveness and relevance of our advertising products and services. Pressure from competitors seeking to acquire a greater share of our advertisers’ overall marketing budget could adversely affect our pricing and margins, lower our revenue, and increase our research and development and marketing expenses. If we are unable to compete successfully against our existing or future competitors, our business, results of operations or financial condition would be harmed.

We Compete in a Dynamic Industry, and We May Invest Significant Resources to Pursue Strategies and Develop New Products and Services That Do Not Prove Effective.

The industry for residential real estate technology, information marketplaces, services, and advertising is dynamic, and the expectations and behaviors of consumers and professionals shift constantly and rapidly. We continue to learn a great deal about the behaviors and objectives of residential real estate market participants as the industry evolves and are investing significant resources to develop, test, and launch products and services to address the needs of the market and improve the homebuying, selling, financing, building, and renting experience. Changes or additions to our products and services may not attract or engage our users, and may reduce confidence in our products and services, negatively impact the quality of our brands, upset other industry participants, expose us to increased market or legal risks, subject us to new laws and regulations, or otherwise harm our business. Our product Zillow Offers, for example, which allows home sellers to request an offer from Zillow to purchase their home, may not engage home sellers as we think it will. Further, if we do not realize the benefits we expect from strategic relationships we enter into, including for example, the generation of additional advertising revenue opportunities, our business could be harmed. We may not successfully anticipate or keep pace with industry changes, and we may invest considerable financial, personnel, and other resources to pursue strategies that do not, ultimately, prove effective such that our results of operations and financial condition may be harmed.

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Zillow Offers Could Fail to Achieve Expected Results and Cause Harm to Our Financial Results, Operations, and Reputation.

Beginning in April 2018, Zillow purchases homes, makes certain repairs and updates, and attempts to sell the homes back into the market through its Zillow Offers service (the “Homes business”). This initiative may expose us to a variety of financial, legal, and reputational risks. The success of the Homes business depends in part on our ability to efficiently acquire, renovate, and sell properties. In determining whether to purchase a property, we may make assumptions, including the estimated time from purchase to sale, update costs, market conditions and potential resale proceeds, closing costs, and holding costs. These assumptions may be inaccurate. Our estimates of what homes are worth, and the algorithms and other data points used to inform those estimates, may not be accurate and we may pay more for homes than the price at which we are able to resell them. In addition, we may not timely discover latent home construction or environmental hazards or other issues which may decrease the value of properties we own. As a result, we may overpay for properties we acquire, and we may not be able to resell them for the price we anticipated or at all. We plan to use third party service providers to make upgrades to and perform maintenance on homes we acquire and, as a result, we may not be able to effectively control the timing and costs of those projects. Further, homes we purchase may suffer decreases in value due to natural disasters, catastrophic events, or other forces outside of our control. The homes we own may not be insured against all damages and losses.

The supply of and demand for homes, and the amounts prospective homebuyers are willing to pay for properties, are impacted by the strength of the overall economy, employment levels, availability of credit, tax or other governmental incentives that encourage homeownership, and regulation of mortgage interest rates, among other factors. Changes to these factors may negatively impact our ability to purchase a sufficient number of properties to realize benefits of scale and sell properties at the amounts we anticipated, if at all.

The actual or perceived quality of the homes we sell may be poor due to factors both within and beyond our control, such as our decision to make certain upgrades but not others and latent defects in properties of which we are not aware. We may experience unsafe conditions at properties while we own them or soon after we resell them, which may cause harm to person or property. We may be subject to new legal, regulatory, local ordinance, and other requirements, as well as disputes with consumers, service providers, and others arising from our purchase, renovation, or resale of properties. These and other factors may reduce consumer confidence in our services and negatively impact our business reputation.

We have limited experience purchasing, upgrading, and selling homes, and our forecasts of financial results for this new business segment may vary significantly from our actual results. The accounting treatment, operational demands, and other aspects of the Homes business are very different from our Internet, Media, and Technology (“IMT”) business and may impact our overall results in ways that are difficult to predict.

Our Entry into the Mortgage Lending Business Could Fail to Achieve Expected Results and Cause Harm to Our Financial Results, Operations, and Reputation.

In October 2018, we completed the acquisition of Mortgage Lenders of America, L.L.C. (“MLOA”), a national mortgage lender. This acquisition may expose us to a variety of financial, legal, and reputational risks. MLOA has historically funded its loans using its warehouse credit facilities, intending to sell all loans to third-party financial institutions after a holding period. Sales of loans to third parties are subject to origination quality standards, and these institutions still retain contractual rights to reject the loans. If MLOA is unable to sell its loans or is required to repurchase the loans from third parties due to representation and warranty claims, it may be required to hold the loans for investment or sell them at a discount.

Additionally, for residential mortgage loans that we originate, borrowers may allege that the origination of the loans did not comply with applicable laws or regulations in one or more respects and assert such violation as an affirmative defense to payment or in an action seeking statutory and other damages in connection with such violation. If we are not successful in demonstrating that the loans in dispute were originated in accordance with applicable statutes and regulations, we could become subject to monetary damages and other civil penalties. Similarly, the third-party financial institutions to whom we sell the loans may claim that the origination of the loans did not comply with the terms of our agreements or applicable guidelines, laws or regulations, and may require MLOA to repurchase loans upon discovery of a breach.

We may use derivatives and other instruments to hedge our mortgage lending interest rate risk. We may not hedge all of our risk, and we may not be successful in hedging any of the risk. Hedging is a complex process, requiring sophisticated models and constant monitoring. We may hedge our interest rate risk by utilizing forward loan sale commitments which may not adequately mitigate the impact of changes in interest rates. We could incur losses from our hedging activities. There may be periods where we elect not to use derivatives and other instruments to hedge mortgage lending interest rate risk.

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Our entry into the mortgage lending business may also cause a negative reaction within the mortgage industry, including among some of our mortgage advertisers, which could harm our reputation, results of operations and financial condition.

We Depend on the Real Estate Industry, and Changes to That Industry, Including to Supply and Demand in the Real Estate Market or Mortgage Lending Regulation, Could Reduce the Demand for, or Restrict Our Ability to Provide, Our Products and Services.

Our financial results significantly depend on real estate market participants using our products and services. Real estate shopping patterns depend on the overall health of the real estate market. Changes to the regulation of the real estate industry, including mortgage lending, may negatively impact the prevalence of home ownership, the amount home buyers are willing and able to spend, and the ability of market participants to close transactions.

Changes to the real estate industry, including to supply and demand in the real estate market, regulation of rental properties, or mortgage interest rates, could reduce demand for our services. In addition, real estate, rental, and mortgage professionals are subject to comprehensive, and rapidly evolving, federal, state, and local laws and regulations which may cause them to significantly alter, decrease, or terminate their purchase of our products and services. Seasonality, micro- and macroeconomic factors, government regulation, tax laws, and other factors may decrease consumer usage as well as sales to our advertisers and other customers, which could harm our results of operations and financial condition.

Certain of our mortgage marketing products are operated by our wholly owned subsidiary, Zillow Group Mortgages, Inc., a licensed mortgage broker, and in October 2018 we completed the acquisition of MLOA, a licensed mortgage lender, through which we originate residential mortgages. Zillow Group Mortgages, Inc. and MLOA are subject to stringent state and federal laws and regulations and to the scrutiny of state and federal government agencies as a licensed mortgage broker and licensed mortgage lender, respectively. Further, due to the geographic scope of our operations and the nature of the services we provide, we maintain real estate brokerage, mortgage broker, and mortgage lender licenses in certain states in which we operate, including in connection with Zillow Offers. In connection with such licenses, we are required to designate individual licensed brokers of record, qualified individuals and control persons. We cannot assure you that we, or our licensed personnel, are and will remain at all times, in full compliance with state real estate and mortgage licensing laws and regulations and we may be subject to fines or penalties in the event of any non-compliance. If in the future a state agency were to determine that we are required to obtain additional licenses in that state in order to operate our business, or if we lose an existing license or are otherwise found to be in violation of a law or regulation, we may be subject to fines or legal penalties, lawsuits, enforcement actions, or our business operations in that state may be suspended or prohibited. Compliance with these laws and regulations is complicated and costly and may inhibit our ability to innovate or grow. Any failure to comply with applicable laws and regulations may limit our ability to expand into new markets, offer new products or continue to operate in one or more of our current markets.

Natural Disasters and Catastrophic Events May Disrupt Real Estate Markets and Our Business.

The occurrence of a significant natural disaster or other catastrophic event, such as earthquake, hurricane, fire, flood, terrorist attack or other similar event, may damage or disrupt our operations, local and regional real estate markets or economies, and negatively impact our business, results of operations and financial condition. Our largest offices are located in Seattle, Washington, Denver, Colorado, and San Francisco, California, and an earthquake or natural disaster in any of these cities could disrupt our engineering and sales teams and equipment critical to the operation of our business. Similarly, a significant natural disaster or other catastrophic event in any major U.S. city could negatively impact a large number of our advertisers and users, and cause a decrease in our revenue or traffic. For example, in connection with the hurricanes and wildfires that occurred during the second half of 2017, we worked closely with our Premier Agents and other advertisers in affected areas to help manage their advertising budgets, and we provided relief initiatives, which included billing credits and other forms of advertiser assistance. We also experienced a temporary decline in traffic to our mobile applications and websites from consumers in impacted areas during September 2017. Though our relief initiatives and the temporary decline in traffic did not have a material impact on our results of operations and financial condition for 2017, our results of operations and financial condition may be negatively affected by natural disasters in the future. In addition, through Zillow Offers, Zillow purchases, updates and sells homes in certain metropolitan areas. The occurrence of a natural disaster or other catastrophic event in any of these localities could have a significant negative impact on those real estate markets and the success of our Homes and mortgage origination businesses in the affected regions.

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We May Not Be Able to Maintain or Establish Relationships With Real Estate Brokerages, Real Estate Listing Aggregators, Multiple Listing Services, Property Management Companies, Home Builders and Other Third-Party Listing Providers, Which Could Limit the Information We Are Able to Provide to Our Users.

Our ability to attract users to our mobile applications, websites and other tools depends to some degree on providing timely access to comprehensive and accurate for-sale, new construction and rental listings. To provide these listings, we maintain relationships with real estate brokerages, real estate listing aggregators, multiple listing services (“MLSs”), property management companies, home builders, other third-party listing providers, and homeowners and their real estate agents to include listing data in our services. Many of our agreements with real estate listing providers are short-term agreements that may be terminated with limited notice. Many of our competitors and other real estate websites have similar access to MLSs and listing data and may be able to source real estate information faster or more efficiently than we can. Another industry participant or group could create a new listings data service, which could impact the relative quality or quantity of information of our listing providers. The loss of existing relationships with MLSs and other listing providers, whether due to termination of agreements or otherwise, changes to our rights to use or timely access listing data, or an inability to continue to add new listing providers or changes to the way real estate information is shared, may negatively impact our listing data quality. This could reduce user confidence in the sale and rental data we provide and make us less popular with consumers, which could harm our business, results of operations and financial condition.

We May Not Be Able to Maintain or Establish Relationships With Data Providers, Which Could Limit the Information We Are Able to Provide to Our Users and Impair Our Ability to Attract or Retain Users.

We obtain real estate data, such as transaction history, property descriptions, tax-assessed value and property taxes paid, under licenses from third-party data providers. We use this data to enable the development, maintenance and improvement of our marketplace and information services, including Zestimates, Rent Zestimates and our living database of homes. We have invested significant time and resources to develop proprietary algorithms, valuation models, software and practices to use and improve on this specific data. We may be unable to renew our licenses with these data providers, enter into new data license agreements, or we may be able to do so only on terms that are less favorable to us, which could harm our ability to continue to develop, maintain and improve these information services and could harm our business, results of operations and financial condition.

If Our Data Integrity Suffers Real or Perceived Harm, Consumers and Advertisers May Decrease Use or Cease Using Our Products and Services, and We May Be Subject to Legal Liability.

Because homes represent significant investments, and many consumer decisions regarding homes are data-driven, our ability to attract and retain users and advertisers to our information products and services is dependent upon our ability to publish, and reputation for publishing, accurate and complete residential real estate information through our mobile applications and websites. As discussed above, a significant amount of the data we publish on our mobile applications and websites are licensed from third parties, and we have limited ability to control the quality of the information we receive from them. We also publish a significant amount of user-generated content, and our tools and processes designed to ensure the accuracy, quality, and legality of such content may not always be effective. Data we generate independently are subject to error, unauthorized modification by way of third-party viruses, and other factors. As the volume of data we publish increases, and potential threats to data quality become more complex, the risk of harm to our data integrity also increases. If our data integrity suffers real or perceived harm, we may be subject to legal liability, and consumers and advertisers may decrease their use or cease using our products and services, which would harm our results of operations and financial condition.

Our Dedication to Making Decisions Based Primarily on the Best Interests of Consumers May Cause Us to Forgo Short-Term Gains.

Our guiding principle is to build our business by making decisions based primarily on the best interests of consumers, which we believe has been essential to our success in increasing our user growth rate and engagement and has served the long-term interests of our company and our shareholders. In the past, we have forgone, and we will in the future forgo, certain expansion or short-term revenue opportunities that we do not believe are in the best interests of consumers, even if such decisions negatively impact our short-term results of operations. In addition, our philosophy of putting consumers first may negatively impact our relationships with our existing or prospective advertisers. This could result in a loss of advertisers, which could harm our revenue and results of operations. For example, we believe that some real estate agents have chosen not to purchase our Premier Agent advertising product because we display a Zestimate on their for-sale listings. We believe, however, that it is valuable to consumers to have access to a valuation starting point on all homes and so we display a Zestimate on every home in the Zillow database for which we have sufficient data to produce the Zestimate. Our consumer focus may also negatively impact our relationships with real estate brokerages, MLSs, and other industry participants on whom we rely for

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listings information. Our Zillow Offers product and our acquisition of MLOA, for example, may be perceived as impinging upon the business models of real estate agents, brokerages and lenders, which may cause them to terminate their listings agreements with us or, with respect to brokerages and lenders, cease advertising with us. Such risks could have a materially negative impact on our results of operations. Our principle of making decisions based primarily on the best interests of consumers may not result in the long-term benefits that we expect, in which case our user traffic and engagement, business and results of operations could be harmed.

We Are Subject to Disputes Regarding the Accuracy or Display of Our Zestimates and Rent Zestimates.

We provide our users with Zestimate and Rent Zestimate home and rental valuations. Zestimates are our estimated current market values of a home based on our proprietary automated valuation models that apply advanced algorithms to analyze our data; they are not appraisals. A Rent Zestimate is our estimated current monthly rental price of a home, using similar automated valuation models that we have designed to address the unique attributes of rental homes. We are, from time to time, involved in disputes with property owners and others who disagree with the accuracy or display of a Zestimate or Rent Zestimate, and such disputes may result in costly litigation in the future. Further, revisions to our automated valuation models, or the algorithms that underlie them, poor data quality, or other factors may cause certain Zestimates or Rent Zestimates to vary from expectations for those Zestimates or Rent Zestimates. Any such dispute or variation in Zestimates or Rent Zestimates could result in distraction from our business or potentially harm our reputation and financial condition.

We Rely on Internet Search Engines and Mobile Application Marketplaces to Connect with Consumers.

We rely on organic traffic generated from search engines like Google to attract users to our websites. This organic traffic is dependent in part upon the way in which links to and information from our websites are featured on search engine result pages. The ranking and other display features of links to and information from our websites is impacted by a variety of factors, many of which are not within our control, such as a change to the search engine ranking algorithm. We devote significant time and resources to digital marketing initiatives, such as search engine optimization, to improve our search result rankings and increase visits to our sites. These marketing efforts may prove unsuccessful due to a variety of factors, including increased costs to use online advertising platforms, ineffective campaigns and increased competition. We also rely on mobile application marketplaces like Apple’s App Store and Google Play to connect users with our mobile applications. These marketplaces may change in a way that negatively affects the prominence of or ease with which users can access our mobile applications. Such changes to Internet search engines or mobile application marketplaces may adversely impact our ability to connect with consumers, which could have a material negative effect on our results of operations and financial condition.

We May Be Unable to Increase Awareness of the Zillow Group Brands Cost-effectively, Which Could Harm Our Business.

We believe the Zillow Group brands, including Zillow and Trulia, are key assets of our company. Awareness and perceived quality and differentiation of the Zillow Group brands are important aspects of our efforts to attract and expand the number of consumers who use our mobile applications and websites. Should the competition and costs for awareness and brand preference increase among providers of mobile or online real estate information, we may not be able to successfully maintain or enhance the strength of our brand. We expect to continue to invest in our paid advertising to increase brand awareness and grow traffic. Paid advertising may not continue to be successful or cost-effective. If we are unable to maintain or enhance user and advertiser awareness of our brands cost-effectively, or if we are unable to recover our additional marketing and advertising costs through increased usage of our products and services, our business, results of operations and financial condition could be harmed.

If We Fail to Manage Our Growth and Multi-Brand Portfolio Effectively, Our Reputation, Results of Operations and Business Could Be Harmed.

We have experienced rapid and significant growth in our headcount and related operations, including as a result of the February 2015 Trulia acquisition and other acquisitions. We have also acquired or launched several new business-to-consumer and business-to-business brands in recent years, including the October 2018 acquisition of MLOA, a consumer-facing mortgage lending business, the 2017 acquisition of New Home Feed, a listing management technology company, and the launch of OutEast.com, a consumer-facing website for real estate in the Hamptons. This growth adds complexity to business operations, including internal controls and compliance, and places substantial demand on management and our operational infrastructure. As we continue to grow, we must effectively integrate, develop and motivate a large number of new employees, while maintaining the beneficial aspects of our company culture, and successfully manage a diverse portfolio of brands. If we do not manage the growth of our business and operations effectively, the quality of our services and efficiency of our operations could suffer, which could harm our brand, results of operations and overall business.

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We Rely on the Performance of Highly Skilled Personnel, and if We Are Unable to Attract, Retain and Motivate Well-Qualified Employees, Our Business Could Be Harmed.

We believe our success has depended, and continues to depend, on the efforts and talents of our management and our highly skilled team of employees, including our software engineers, statisticians, marketing professionals and advertising sales staff. Our future success depends on our continuing ability to attract, develop, motivate and retain highly qualified and skilled employees. The loss of any of our senior management or key employees could materially adversely affect our ability to build on the efforts they have undertaken and to execute our business plan, and we may not be able to find adequate replacements. The market for highly skilled personnel is very competitive. We cannot ensure that we will be able to retain the services of any members of our senior management or other key employees. If we do not succeed in attracting well-qualified employees or retaining and motivating existing employees in a cost-effective manner, our business could be harmed.

We May Make Acquisitions and Investments, Which Could Result in Operating Difficulties, Dilution and Other Harmful Consequences.

We continue to evaluate a wide array of potential strategic opportunities, including acquisitions and investments. For example, we acquired MLOA in October 2018, and acquired Hamptons Real Estate Online, or HREO, and New Home Feed, and purchased an equity interest in a privately held corporation, in the year ended December 31, 2017. Any transactions that we enter into could be material to our financial condition and results of operations. The acquisitions may not result in the intended benefits to our business, and we may not successfully evaluate or utilize the acquired products, technology, or personnel, or accurately forecast the financial impact of an acquisition transaction. The process of integrating an acquired company, business or technology could create unforeseen operating difficulties and expenditures. The areas where we face risks include:

• diversion of management time and focus from operating our business to acquisition integration challenges;

• consumer and industry acceptance of products and services offered by the acquired company;

• implementation or remediation of controls, procedures and policies at the acquired company;

• coordination of product, engineering and sales and marketing functions;

• retention of employees from the acquired company;

• liability for activities of the acquired company before the acquisition;

• litigation or other claims arising in connection with the acquired company; and

• impairment charges associated with goodwill and other acquired intangible assets.

For example, during the year ended December 31, 2017, we recorded a non-cash impairment for $174.0 million related to the $351.0 million indefinite-lived intangible asset that we recorded in connection with our February 2015 acquisition of Trulia for Trulia’s trade names and trademarks, and during the three months ended September 30, 2018, we recognized a non-cash impairment charge of $10.0 million related to a June 2017 investment.

Our failure to address these risks or other problems encountered in connection with our past or future acquisitions and investments could cause us to fail to realize the anticipated benefits of such acquisitions or investments, incur unanticipated liabilities, and harm our business, results of operations and financial condition.

Our Fraud Detection Processes and Information Security Systems May Not Successfully Detect All Fraudulent Activity by Third Parties Aimed at Users of Our Mobile Applications and Websites, Which Could Adversely Affect Our Reputation and Business Results.

Third-party actors have attempted in the past, and may attempt in the future, to conduct fraudulent activity by engaging with users of our mobile applications and websites by, for example, posting fake real estate listings on our sites and attempting to solicit personal information or money from users. Though we have sophisticated fraud detection processes and have taken other measures to identify fraudulent activity on our mobile applications and websites, we may not be able to detect and prevent all such activity. Persistent or pervasive fraudulent activity may cause users and advertisers to lose trust in us and decrease or terminate their usage of our products and services, thereby harming our business and results of operations.

We Are Subject to a Number of Risks Related to the Credit Card and Debit Card Payments We Accept.

We accept payments through credit and debit card transactions. For credit and debit card payments, we pay interchange and other fees, which may increase over time. An increase in those fees may require us to increase the prices we charge and would increase our operating expenses, either of which could harm our business, financial condition and results of operations.

We depend on processing vendors to complete credit and debit card transactions, both for payments owed to Zillow Group directly and for payments to other third-parties, such as payments made by renters to landlords in our rental payments

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product. If we or our processing vendors fail to maintain adequate systems for the authorization and processing of credit card transactions, it could cause one or more of the major credit card companies to disallow our continued use of their payment products. In addition, if these systems fail to work properly and, as a result, we do not charge our customers’ credit cards on a timely basis or at all, our business, revenue, results of operations and financial condition could be harmed.

The payment methods that we offer also subject us to potential fraud and theft by criminals, who are becoming increasingly more sophisticated, seeking to obtain unauthorized access to or exploit weaknesses that may exist in the payment systems. If we fail to comply with applicable rules or requirements for the payment methods we accept, or if payment-related data are compromised due to a breach of data, we may be liable for significant costs incurred by payment card issuing banks and other third parties or subject to fines and higher transaction fees, or our ability to accept or facilitate certain types of payments may be impaired. In addition, our customers could lose confidence in certain payment types, which may result in a shift to other payment types or potential changes to our payment systems that may result in higher costs. If we fail to adequately control fraudulent credit card transactions, we may face civil liability, diminished public perception of our security measures, and significantly higher credit card-related costs, each of which could harm our business, results of operations and financial condition.

We are also subject to payment card association operating rules, certification requirements and rules governing electronic funds transfers, which could change or be reinterpreted to make it more difficult for us to comply. We are required to comply with payment card industry security standards. Failing to comply with those standards may violate payment card association operating rules, federal and state laws and regulations, and the terms of our contracts with payment processors. Any failure to comply fully also may subject us to fines, penalties, damages and civil liability, and may result in the loss of our ability to accept credit and debit card payments. Further, there is no guarantee that such compliance will prevent illegal or improper use of our payment systems or the theft, loss, or misuse of data pertaining to credit and debit cards, card holders and transactions.

If we are unable to maintain our chargeback rate or refund rates at acceptable levels, our processing vendors may increase our transaction fees or terminate their relationships with us. Any increases in our credit and debit card fees could harm our results of operations, particularly if we elect not to raise our rates for our service to offset the increase. The termination of our ability to process payments on any major credit or debit card would significantly impair our ability to operate our business.

Risks Related to Our Intellectual Property and Technology

If Our Security Measures or Technology Systems Are Compromised, We May Be Subject to Legal Claims and Suffer Significant Losses, and Consumers May Curtail Use of Our Products and Services and Advertisers May Reduce Their Advertising on Our Mobile Applications and Websites.

Our products and services involve the transmission, processing, and/or storage of users’ information, some of which may be private or include personally identifiable information such as social security numbers and credit card information. For example, our dotloop real estate transaction management software stores sensitive personal and financial information, and our Mortech mortgage product and pricing software for mortgage professionals processes social security numbers, and MLOA, our mortgage origination business, receives, handles and transmits highly sensitive personal and financial information about its borrowers. Security breaches and administrative or technical failures could expose us to a risk of data loss or exposure, including both consumer and customer data as well as intellectual property and other confidential business information, which could result in potential significant liability and litigation. Like all mobile application and website providers, our mobile applications and websites are vulnerable to computer viruses, break-ins, phishing attacks, or other attacks, any of which could lead to loss of critical data or the unauthorized disclosure or use of personal or other confidential information. Further, outside parties may attempt to fraudulently induce employees, users or advertisers to disclose sensitive information in order to gain access to our information or our users’ or advertisers’ information, and our information technology and infrastructure may be vulnerable to attacks by hackers or breached due to employee error, malfeasance or other disruptions. If we experience compromises to our security that result in the loss or unauthorized disclosure of confidential information, our users and advertisers may lose trust in us, users may decrease the use of our mobile applications or websites or stop using our mobile applications or websites in their entirety, advertisers may decrease or stop advertising on our mobile applications or websites, and we may be subject to legal claims, government investigation and additional state and federal legal requirements.

We engage a variety of vendors to process and store certain user information, some of which may be private or include personally identifiable information. We also depend on vendors to host many of the systems and infrastructure used to provide our products and services. If our data storage vendors fail to maintain adequate information security systems and our systems or our users’ information is compromised, our business, results of operations and financial condition could be harmed. A security breach at our vendor could be perceived by consumers or our customers as a breach of our systems and could result in damage to our reputation and expose us to other losses.

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Further, because the techniques used to obtain unauthorized access, disable or degrade service, or sabotage systems change frequently, often are not recognized until launched against a target, and may originate from less regulated and remote areas around the world, we may be unable to proactively address all these techniques or to implement adequate preventative measures. Any or all of these issues could negatively impact our ability to attract new users and increase engagement by existing users, cause existing users to curtail or stop use of our products or services or close their accounts, cause existing advertisers to cancel their contracts, cause us to incur significant costs to notify affected individuals and upgrade our technology, or subject us to third-party lawsuits, regulatory fines or other action or liability, thereby harming our business, results of operations and financial condition.

Any Significant Disruption in Service on Our Mobile Applications or Websites or in Our Network Could Damage Our Reputation and Brands, and Result in a Loss of Users of Our Products and Services and of Advertisers, Which Could Harm Our Business, Results of Operations and Financial Condition.

Our brand, reputation and ability to attract users and advertisers depend on the reliable performance of our network infrastructure and content delivery processes. Our mobile applications and websites are exposed to attempts to overload our servers with denial-of-service attacks or similar disruptions from unauthorized use of our computer systems. We have experienced minor interruptions in these systems in the past, including server failures that temporarily slowed the performance of our mobile applications and websites, and we may experience interruptions in the future. Interruptions in these systems, whether due to system failures, computer viruses, software errors or physical or electronic break-ins, could affect the security or availability of our products and services on our mobile applications and websites and prevent or inhibit the ability of users to access our services. Since our users may rely on our products and services, including our customer relationship management tools, for important aspects of their businesses, problems with the reliability, availability or security of our systems could damage our users’ businesses, harm our reputation, result in a loss of users of our products and services and of advertisers and result in additional costs, any of which could harm our business, results of operations and financial condition. In October 2016, for example, traffic to our websites zillow.com and trulia.com was impacted by a distributed denial of service attack against one of our domain name system providers. This incident did not have a material adverse effect on our business, and there is no indication that our internal controls were compromised. Despite the additional network detection tools and other processes we implemented, and our continual work to install new, and upgrade existing, information technology systems and provide employee awareness training around phishing, malware, and other cyber risks, we cannot ensure that we will not experience similar incidents in the future.

Our Zillow technical infrastructure, mobile applications and websites are hosted at a third-party facility located in the Seattle area. We manage our Trulia mobile applications and website from a shared data center in Santa Clara, California. Additionally, we utilize third-party web services for cloud computing and storage to assist in service growth and redundancy.

We do not own or control the operation of certain of these facilities. Our systems and operations are vulnerable to damage or interruption from fire, flood, power loss, telecommunications failure, terrorist attacks, acts of war, electronic and physical break-ins, computer viruses, earthquakes and similar events. The occurrence of any of the foregoing events could result in damage to our systems and hardware or could cause them to fail completely, and our insurance may not cover such events or may be insufficient to compensate us for losses that may occur.

A failure of our systems at one site could result in reduced functionality for our users, and a total failure of our systems could cause our mobile applications or websites to be inaccessible. Problems faced by our third-party web-hosting providers with the telecommunications network providers with which they contract or with the systems by which they allocate capacity among their customers, including us, could adversely affect the experience of our users. Our third-party web-hosting providers could decide to close their facilities without adequate notice. Any financial difficulties, such as bankruptcy reorganization, faced by our third-party web-hosting providers or any of the service providers with whom they contract may have negative effects on our business, the nature and extent of which are difficult to predict. If our third-party web-hosting providers are unable to keep up with our growing needs for capacity, our business could be harmed. In addition, if distribution channels for our mobile applications experience disruptions, such disruptions could adversely affect the ability of users and potential users to access or update our mobile applications, which could harm our business.

We do not carry business interruption insurance sufficient to compensate us for the potentially significant losses, including the potential harm to the future growth of our business, which may result from interruptions in our service as a result of system failures. Any errors, defects, disruptions or other performance problems with our services could harm our reputation, business, results of operations and financial condition.

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We Rely Upon Certain Third Party Services to Support Critical Functions of Our Business and Any Disruption of or Interference with our Use of those Third Party Services Could Adversely Impact Our Operations and Our Business.

A limited number of third party services support essential functions of our business, including Amazon Web Services (“AWS”) and certain other Software-as-a-Service technologies hosted by third parties (“SaaS Services”). AWS provides us with a distributed computing infrastructure platform for business operations, which is commonly referred to as a “cloud” computing service. Certain of our computer systems utilize data processing, storage capabilities and other services provided by AWS, and we currently run the vast majority of computing to power our mobile applications, websites, and other technology products and services on AWS. In addition, we use SaaS Services to support important functions of our business, including enterprise resource planning and customer relationship management. We store a significant amount of information about our users, customers, employees, and business on AWS and in the SaaS Services, and we rely on these third-party service providers to provide services on a timely and effective basis. Their failure to perform as expected or as required by contract could result in significant disruptions and costs to our operations. In light of our reliance on AWS and SaaS Services, coupled with the complexity of obtaining replacement services, any disruption of or interference with our use of these third-party services could adversely impact our operations and business.

We May Be Unable to Adequately Protect Our Intellectual Property, Which Could Harm the Value of Our Brands and Our Business.

We regard our intellectual property as critical to our success, and we rely on trademark, copyright and patent law, trade secret protection and contracts to protect our proprietary rights. If we are not successful in protecting our intellectual property, the value of our brands and our business, results of operations and financial condition could be harmed.

While we believe that our issued patents and pending patent applications help to protect our business, we cannot ensure that our operations do not, or will not, infringe valid, enforceable patents of third parties or that competitors will not devise new methods of competing with us that are not covered by our patents or patent applications. We cannot ensure that our patent applications will be approved, that any patents issued will adequately protect our intellectual property, that such patents will not be challenged by third parties or found to be invalid or unenforceable, or that our patents will be effective in preventing third parties from utilizing a “copycat” business model to offer the same products or services. Our Zestimate home valuation, for example, which we consider to be a key competitive advantage with respect to consumer engagement, is currently protected by a patent, the loss of which could benefit comparable services provided by our competitors and result in decreased user traffic and engagement with our mobile applications and websites, thereby harming our results of operations and financial condition.

Effective trademark, service mark, copyright and trade secret protection may not be available in every country in which our products and services may be provided. The laws of certain countries do not protect proprietary rights to the same extent as the laws of the United States and, therefore, in certain jurisdictions, we may be unable to protect intellectual property and our proprietary technology adequately against unauthorized third-party copying or use, which could harm our competitive position. We have licensed in the past, and expect to license in the future, certain of our proprietary rights, such as trademarks or copyrighted material, to third parties. These licensees may take actions that might diminish the value of our proprietary rights or harm our reputation, even if we have agreements prohibiting such activity. Though certain of these third parties are obligated to indemnify us for breaches of our intellectual property rights, they may be unable to meet these obligations. In addition, we rely on intellectual property and technology developed or licensed by third parties, and we may not be able to obtain licenses and technologies from these third parties on reasonable terms or at all. Any of these events could harm our business, results of operations or financial condition.

In addition, we may actively pursue entities that infringe our intellectual property, including through legal action. Taking such action may be costly, and we cannot ensure that such actions will be successful. Any increase in the unauthorized use of our intellectual property could make it more expensive for us to do business and harm our results of operations or financial condition.

Intellectual Property Disputes Are Costly to Defend and Could Harm Our Business, Results of Operations, Financial Condition and Reputation.

From time to time, we face allegations that we have infringed the trademarks, copyrights, patents and other intellectual property rights of third parties. We are currently subject to intellectual property infringement claims. These claims allege, among other things, that aspects of our technology infringe upon the plaintiffs’ intellectual property. If we are not successful in defending ourselves against these claims, we may be required to pay damages and may be subject to injunctions, each of which could harm our business, results of operations, financial condition and reputation. As we grow our business and expand our operations, we expect that we will continue to be subject to intellectual property claims and allegations. Patent and other

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intellectual property disputes or litigation may be protracted and expensive, and the results are difficult to predict and may require us to stop offering certain products, services or features, purchase licenses that may be expensive to procure, or modify our products or services. In addition, patent or other intellectual property disputes or litigation may result in significant settlement costs. Any of these events could harm our business, results of operations, financial condition and reputation.

In addition, we use open source software in our services and will continue to use open source software in the future. From time to time, we may be subject to claims brought against companies that incorporate open source software into their products or services, claiming ownership of, or demanding release of, the source code, the open source software and/or derivative works that were developed using such software, or otherwise seeking to enforce the terms of the applicable open source license. These claims could also result in litigation, and we may be required to purchase a costly license or remove open source software, devote additional research and development resources to changing our products or services, make generally available the source code for our proprietary technology, or waive certain of our intellectual property rights, any of which would have a negative effect on our business and results of operations.

Even if these matters do not result in litigation or are resolved in our favor or without significant cash settlements, the time and resources necessary to resolve them could harm our business, results of operations, financial condition and reputation.

We May Be Unable to Continue to Use the Domain Names That We Use in Our Business, or Prevent Third Parties From Acquiring and Using Domain Names That Infringe on, Are Similar to, or Otherwise Decrease the Value of Our Brand or Our Trademarks or Service Marks.

We have registered domain names for our websites that we use in our business. If we lose the ability to use a domain name, we may incur significant expenses to market our products and services under a new domain name, which could harm our business. In addition, our competitors could attempt to capitalize on our brand recognition by using domain names similar to ours. Domain names similar to ours have been registered in the United States and elsewhere. We may be unable to prevent third parties from acquiring and using domain names that infringe on, are similar to, or otherwise decrease the value of our brand or our trademarks or service marks. Protecting and enforcing our rights in our domain names and determining the rights of others may require litigation, which could result in substantial costs and diversion of management’s attention.

Confidentiality Agreements With Employees and Others May Not Adequately Prevent Disclosure of Trade Secrets and Other Proprietary Information.

In order to protect our technologies and strategic business and operations information, we rely in part on confidentiality agreements with our employees, independent contractors, vendors, licensees, and other third parties. These agreements may not effectively prevent disclosure of confidential information, including trade secrets, and may not provide an adequate remedy in the event of unauthorized disclosure of confidential information. The loss of trade secret protection could make it easier for third parties to compete with our products by copying functionality. Others may independently discover our trade secrets and proprietary information, and in such cases, we could not assert any trade secret rights against such parties. Further, if our employees, contractors or other third parties with whom we do business use intellectual property owned by others in their work for us, disputes may arise as to the rights in related or resulting know-how and inventions. Any changes in, or unfavorable interpretations of, intellectual property laws may compromise our ability to enforce our trade secret and intellectual property rights. Costly and time-consuming litigation could be necessary to enforce and determine the scope of our proprietary rights, and failure to obtain or maintain protection of our trade secrets or other proprietary information could harm our business, results of operations, reputation and competitive position.

We May Not Be Able to Halt the Operations of Websites That Aggregate or Misappropriate Our Data.

From time to time, third parties have misappropriated our data through website scraping, robots or other means, and aggregated this data on their websites with data from other companies. In addition, copycat websites have misappropriated data on our network and attempted to imitate our brand or the functionality of our websites. When we have become aware of such websites, we have employed technological or legal measures in an attempt to halt their operations. We may not be able, however, to detect all such websites in a timely manner and, even if we could, technological and legal measures may be insufficient to halt their operations. In some cases, particularly in the case of websites operating outside of the United States, our available remedies may not be adequate to protect us against the impact of the operation of such websites. In addition, if such activity creates confusion among consumers or advertisers, our brands and business could be harmed. Regardless of whether we can successfully enforce our rights against the operators of these websites, any measures that we may take could require us to expend significant financial or other resources, which could harm our business, results of operations or financial condition.

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Risks Related to Regulatory Compliance and Legal Matters

We Are, and May in the Future Become, Subject to a Variety of International, Federal, State, and Local Laws, Many of Which Are Unsettled and Still Developing and Which Could Subject Us to Claims or Otherwise Harm Our Business.

With offices and owned properties located throughout the United States and an office in Vancouver, British Columbia, we are currently subject to a variety of, and may in the future become subject to additional, international, federal, state, and local laws that are continuously evolving and developing, including laws regarding the real estate, rental and mortgage industries, mobile- and internet-based businesses and other businesses that rely on advertising, as well as privacy and consumer protection laws, including the Telephone Consumer Protection Act, the Telemarketing Sales Rule, the CAN-SPAM Act, the Fair Credit Reporting Act, the Canadian Anti-Spam Law, the Personal Information Protection and Electronic Documents Act, along with employment laws, including those governing wage and hour requirements, and, in connection with Zillow Offers, laws addressing the purchase, upgrade, and sale of homes, including those governing hazardous substances. These laws are complex and can be costly to comply with, require significant management time and effort, and subject us to claims, government enforcement actions, civil and criminal liability or other remedies, including suspension of business operations. These laws may conflict with each other, and if we comply with the laws of one jurisdiction, we may find that we are violating laws of another jurisdiction.

If we are unable to comply with these laws or regulations in a cost-effective manner, we may modify impacted products and services, which could require a substantial investment and loss of revenue, or cease providing the impacted product or service altogether. If we are found to have violated laws or regulations, we may be subject to significant fines, penalties, and other losses.

We assist with the processing of customer credit card transactions, consumer credit report requests, mortgage loan originations, and provide other product offerings, which results in us receiving or facilitating transmission of personally identifiable information. This information is increasingly subject to legislation and regulation in the United States. This legislation and regulation is generally intended to protect the privacy and security of personal information, including credit card information that is collected, processed and transmitted. For example, the recently enacted California Consumer Privacy Act, which will become effective on January 1, 2020, will impose restrictions on companies’ use of personal data. We could be adversely affected if government regulations require us to significantly change our business practices with respect to this type of information or if the third-parties that we engage with to provide processing and screening services violate applicable laws and regulations.

We are From Time to Time Involved In, or May In the Future be Subject to, Claims, Suits, Government Investigations, and Other Proceedings That May Result In Adverse Outcomes.

We are from time to time involved in, or may in the future be subject to, claims, suits, government investigations, and proceedings arising from our business, including actions with respect to intellectual property claims, privacy, consumer protection, information security, data protection or law enforcement matters, tax matters, labor and employment claims, commercial claims, as well as actions involving content generated by our users, shareholder derivative actions, purported class action lawsuits, and other matters, including those matters described in Part I, Item 1 in Note 17 under the subsection titled “Legal Proceedings” in our Notes to Condensed Consolidated Financial Statements in this Quarterly Report on Form 10-Q. Such claims, suits, government investigations, and proceedings are inherently uncertain, and their results cannot be predicted with certainty. Regardless of the outcome, any such legal proceedings can have an adverse impact on us because of legal costs, diversion of management and other personnel, and other factors. In addition, it is possible that a resolution of one or more such proceedings could result in reputational harm, liability, penalties, or sanctions, as well as judgments, consent decrees, or orders preventing us from offering certain features, functionalities, products, or services, or requiring a change in our business practices, products or technologies, which could in the future materially and adversely affect our business, operating results and financial condition.

The Requirements of Being a Public Company May Strain Our Resources and Distract Our Management, Which Could Make It Difficult to Manage Our Business.

We are required to comply with various regulatory and reporting requirements, including those required by the SEC. Complying with these reporting and other regulatory requirements can be time-consuming and results in increased costs to us and could harm our business, results of operations and financial condition.

As a public company, we are subject to the reporting requirements of the Securities Exchange Act of 1934, as amended, or the Exchange Act. These requirements could strain our systems and resources. The Exchange Act also requires that we file

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annual, quarterly and current reports with respect to our business and financial condition. The Exchange Act requires that we maintain effective disclosure controls and procedures and internal control over financial reporting. To maintain and improve the effectiveness of our disclosure controls and procedures and internal control over financial reporting, we have committed significant resources, hired additional staff and provided additional management oversight. We have implemented additional procedures and processes for the purpose of addressing the standards and requirements applicable to public companies. For example, new revenue recognition guidance was issued by the Financial Accounting Standards Board (“FASB”), which we adopted on January 1, 2018, requiring additional personnel time and other costs to implement. In addition, we expect to invest additional personnel time and other costs to implement new guidance on leases, which we plan to adopt on January 1, 2019. Sustaining our growth will require us to commit additional management, operational and financial resources to identify new professionals to join us and to maintain appropriate operational and financial systems to adequately support expansion. These activities may divert management’s attention from other business concerns and could make it difficult to manage our business, which could harm our business, results of operations, financial condition and cash flows. In addition, if we identify any material weaknesses in our internal controls, we could lose investor confidence in the accuracy and completeness of our financial reports, which would cause the market price of our capital stock to decline.

Risks Related to Our Financial Statements

We Incurred Significant Operating Losses in the Past and We May Not Be Able to Generate Sufficient Revenue to Be Profitable Over the Long Term.

We have incurred significant net operating losses in the past and, as of September 30, 2018, we had an accumulated deficit of $574.1 million. Although we have experienced significant growth in revenue, our revenue growth rate may decline in the future as the result of a variety of factors, including the maturation of our business. At the same time, we also expect our costs to increase in future periods as we continue to expend substantial financial resources to develop and expand our business, including on:

• product development;

• sales and marketing;

• technology infrastructure;

• strategic opportunities, including commercial relationships and acquisitions; and

• general and administrative expenses, including legal and accounting expenses related to being a public company.

These investments may not result in increased revenue or growth in our business. If we fail to continue to grow our revenue and overall business and to manage our expenses, we may incur significant losses in the future and not be able to maintain profitability.

Servicing Our Debt Requires a Significant Amount of Cash, and We May Not Have Sufficient Cash Flow From Our Business to Pay Our Substantial Debt.

Our ability to make scheduled payments of the principal of, to pay interest on or to refinance our indebtedness, including the remaining outstanding $9.6 million aggregate principal under Trulia’s Convertible Senior Notes due in 2020 (the “2020 Notes”), the $460.0 million aggregate principal under our Convertible Senior Notes due in 2021 (the “2021 Notes”), and the $373.8 million aggregate principal amount under our Convertible Senior Notes due in 2023 (the “2023 Notes”), depends on our future performance, which is subject to economic, industry, competitive and other factors beyond our control. Our business may not continue to generate cash flow from operations in the future sufficient to service our debt and make necessary capital expenditures. If we are unable to generate such cash flow, we may be required to adopt one or more alternatives, such as selling assets, restructuring debt or obtaining additional equity capital on terms that may be onerous or highly dilutive. Our ability to refinance our indebtedness will depend on the capital markets and our financial condition at such time. We may not be able to engage in any of these activities or engage in these activities on desirable terms, which could result in a default on our debt obligations.

We May Need to Raise Additional Capital to Grow Our Business and We May Not Be Able to Raise Additional Capital on Terms Acceptable to Us, or At All.

Growing and operating our business, including through the development of new and enhanced products and services, may require significant cash outlays, liquidity reserves and capital expenditures. If cash on hand, cash generated from operations and cash equivalents and investment balances are not sufficient to meet our cash and liquidity needs, we may need to seek additional capital and we may not be able to raise the necessary cash on terms acceptable to us, or at all. For example, our Homes business will require significant cash to acquire, update and sell homes. We entered into a revolving credit facility in July 2018 to support operations of this business, and our acquisition of MLOA in October 2018 includes the assumption of

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warehouse facilities to finance its mortgage origination activities. Financing arrangements we pursue or assume may require us to grant certain rights or agree to certain restrictions, that could negatively impact our business. If additional capital is not available to us on terms acceptable to us or at all, we may need to modify our business plans, which would harm our ability to grow our operations.

We Rely on Assumptions, Estimates, and Business Data to Calculate our Key Performance Indicators and Other Business Metrics, and Real or Perceived Inaccuracies in These Metrics May Harm our Reputation and Negatively Affect our Business.

Certain of our performance metrics are calculated using third party applications or internal company data that have not been independently verified. While these numbers are based on what we believe to be reasonable calculations for the applicable period of measurement, there are inherent challenges in measuring such information. For example, our measurement of unique users and visits may be affected by applications that automatically contact our servers to access our mobile applications and websites with no user action involved, and this activity can cause our system to count the user associated with such a device as a unique user or as a visit on the day such contact occurs.

We regularly review and may adjust our processes for calculating our performance metrics to improve accuracy. Our measure of certain metrics may differ from estimates published by third parties or from similarly-titled metrics of our competitors due to differences in methodology. If real estate professionals, advertisers or investors do not perceive our unique users or visits to be an accurate representation of our user engagement, or if we discover material inaccuracies in our unique users or visits, our reputation may be harmed, and real estate professionals and advertisers may be less willing to allocate their resources to our products and services, which could negatively affect our business and operating results.

We Expect Our Results of Operations to Fluctuate on a Quarterly and Annual Basis.

Our revenue and results of operations could vary significantly from period to period and may fail to match expectations as a result of a variety of factors, some of which are outside our control. The other risk factors discussed in this “Risk Factors” section may contribute to the variability of our quarterly and annual results. In addition, our results may fluctuate as a result of fluctuations in the quantity of, and the price at which we are able to sell, our remnant advertising, seasonal variances of home sales, which historically peak in the spring and summer seasons, and the size and seasonal variability of our advertisers’ marketing budgets. The seasonal variance and cyclical nature of home sales may contribute to the variability of our revenue and results of operations for the Homes and mortgage lending businesses, in particular. As a result of the potential variations in our revenue and results of operations, period-to-period comparisons may not be meaningful and the results of any one period should not be relied on as an indication of future performance. In addition, our results of operations may not meet the expectations of investors or public market analysts who follow us, which may adversely affect our stock price.

We Could Be Subject to Additional Income Tax Liabilities and Our Ability to Use Our Net Operating Loss Carryforwards and Certain Other Tax Attributes May Be Limited.

We are subject to federal and state income taxes in the United States and in Canada. Tax laws, regulations, and administrative practices in various jurisdictions may be subject to significant change, with or without notice, due to economic, political, and other conditions, and significant judgment is required in evaluating and estimating these taxes. Our effective tax rates could be affected by numerous factors, such as entry into new businesses and geographies, changes to our existing business and operations, acquisitions and investments and how they are financed, changes in our stock price, changes in our deferred tax assets and liabilities and their valuation, and changes in the relevant tax, accounting, and other laws, regulations, administrative practices, principles, and interpretations. In the ordinary course of our business, there are transactions and calculations where the ultimate tax determination is uncertain. Economic and political pressure to increase tax revenue in various jurisdictions may make resolving tax disputes favorably more difficult and could create additional tax liabilities.

As of December 31, 2017, we had federal net operating loss carryforwards of approximately $1,014.0 million, state net operating loss carryforwards of approximately $21.4 million (tax effected), and net tax credit carryforwards of approximately $35.8 million. Under Sections 382 and 383 of the Internal Revenue Code of 1986, as amended, if a corporation undergoes an “ownership change,” the corporation’s ability to use its pre-change net operating loss carryforwards and other pre-change tax attributes, such as research tax credits, to offset its post-change income or income tax liability may be limited. In general, an “ownership change” will occur if there is a cumulative change in our ownership by certain “5-percent shareholders” that exceeds 50 percentage points over a rolling three-year period. In connection with Zillow’s August 2013 public offering of Zillow Class A Common stock, Zillow experienced an ownership change that triggered Section 382 and 383, which may limit our ability to utilize net operating loss and tax credit carryforwards. In connection with Zillow Group’s February 2015 acquisition of Trulia, Trulia experienced an ownership change that triggered Section 382 and 383, which may limit Zillow

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Group’s ability to utilize Trulia’s net operating loss and tax credit carryforwards. If we experience one or more ownership changes in the future as a result of future transactions in our stock, our ability to utilize net operating loss carryforwards could be limited. Furthermore, our ability to utilize net operating loss carryforwards of any companies that we have acquired or may acquire in the future may be limited. As a result, if we earn net taxable income, our ability to use our pre-change net operating loss carryforwards, other pre-change tax attributes, or net operating loss carryforwards of any acquired companies to offset our federal taxable income or reduce our federal income tax liability may be subject to limitation.

Risks Related to Ownership of Our Common and Capital Stock and Debt Instruments

Our Class A Common Stock and Class C Capital Stock Prices May Be Volatile, and the Value of an Investment in Our Class A Common Stock and Class C Capital Stock May Decline.

An active, liquid and orderly market for our Class A common stock and Class C capital stock may not be sustained, which could depress the trading price of our Class A common stock and Class C capital stock. The trading price of our Class A common stock and Class C capital stock has at times experienced price volatility and may continue to be volatile. For example, since shares of our Class A common stock began trading in February 2015, the closing price of our Class A common stock has ranged from $17.06 per share to $65.21 per share (adjusted for the August 2015 stock split effected in the form of a dividend) through September 30, 2018. Since shares of our Class C capital stock began trading in August 2015, the closing price of our Class C capital stock has ranged from $16.01 per share to $65.57 per share through September 30, 2018. The market price of our Class A common stock and Class C capital stock could be subject to wide fluctuations in response to many of the risk factors discussed in this Quarterly Report on Form 10-Q and others beyond our control, including:

• 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;

• announcements by us or our competitors of significant acquisitions, strategic partnerships, joint ventures or capital-raising activities or commitments;

• announcements of technological innovations or new offerings by us or our competitors;

• additions or departures of key personnel;

• changes in laws or regulations applicable to our services;

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

• the inclusion, exclusion, or deletion of our Class A common stock and Class C capital stock from any trading indices, such as the S&P 500 Index;

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

• sales of our Class A common stock and Class C capital stock by us or our shareholders;

• issuances of our Class A common stock upon conversion of the 2020 Notes and issuances of our Class C capital stock upon conversion of our 2021 Notes and 2023 Notes;

• stock price and volume fluctuations attributable to inconsistent trading volume levels of our shares; and

• general economic and market conditions.

Furthermore, the stock markets in recent years have experienced extreme price and volume fluctuations that have affected and continue to affect the market prices of the equity securities of many companies. These fluctuations often have been unrelated or disproportionate to the operating performance of those companies. These broad market and industry fluctuations, as well as general economic, political and market conditions such as recessions, interest rate changes or international currency fluctuations, may negatively impact the market price of our Class A common stock and Class C capital stock. In the past, companies that have experienced volatility in the market price of their stock have been subject to securities class action litigation. We have in the past been and are currently the target of this type of litigation, and we may continue to be the target of this type of litigation in the future. Past, current, and future securities litigation against us could result in substantial costs and divert management’s attention from other business concerns, which could harm our business, results of operations or financial condition.

The Structure of Our Capital Stock as Contained in Our Charter Documents Has the Effect of Concentrating Voting Control With Our Founders, and Limits Your Ability to Influence Corporate Matters.

Since Zillow Group’s inception, our capital structure has included authorized Class A common stock and authorized Class B common stock. Our Class A common stock entitles its holder to one vote per share, and our Class B common stock entitles its holder to 10 votes per share. All shares of Class B common stock have been and are held or controlled by our founders, Richard Barton and Lloyd Frink. As of September 30, 2018, Mr. Barton’s holdings and Mr. Frink’s holdings represented approximately 31.4% and 20.5%, respectively, of the voting power of our outstanding capital stock.

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For the foreseeable future, Mr. Barton and Mr. Frink will therefore have significant control over our management and affairs and will be able to control most matters requiring shareholder approval, including the election or removal (with or without cause) of directors and the approval of any significant corporate transaction, such as a merger or other sale of us or our assets. In addition, because our Class C capital stock carries no voting rights (except as required by applicable law or as expressly provided in our amended and restated articles of incorporation), the issuance of Class C capital stock (instead of Class A common stock) could prolong the duration of Mr. Barton’s and Mr. Frink’s relative ownership of our voting power. This concentrated control could delay, defer or prevent a change of control, merger, consolidation, takeover, or other business combination involving us that you, as a shareholder, may otherwise support. This concentrated control could also discourage a potential investor from acquiring our Class A common stock or Class C capital stock due to the limited voting power of such stock relative to the Class B common stock and might harm the market price of our Class A common stock and Class C capital stock.

Future Sales of Our Stock in the Public Market Could Cause Our Stock Price to Decline.

Our Class A common stock began trading on The Nasdaq Global Select Market on February 18, 2015, and our Class C capital stock began trading on The Nasdaq Global Select Market on August 17, 2015. We cannot predict the effect, if any, that market sales of shares or the availability of shares for sale will have on the prevailing trading price of our Class A common stock and Class C capital stock from time to time. There is currently no contractual restriction on our ability to issue additional shares, and all of our outstanding shares are generally freely tradable, except for shares held by our “affiliates” as defined in Rule 144 under the Securities Act, which may be sold in compliance with the volume restrictions of Rule 144. Sales of a substantial number of shares of our Class A common stock and Class C capital stock could cause our stock price to decline. In addition, we may in the future issue shares of Class C capital stock for financings, acquisitions or equity incentives. If we issue shares of Class C capital stock in the future, such issuances would have a dilutive effect on the economic interest of our Class A common stock.

If Securities or Industry Analysts Do Not Publish Research or Publish Inaccurate or Unfavorable Research About Our Business, Our Class A Common Stock and Class C Capital Stock Price and Trading Volume Could Decline.

The trading market for our Class A common stock and Class C capital stock depends in part on the research and reports that securities or industry analysts publish about our company. If few or no securities or industry analysts cover our company, the market price of our publicly-traded stock could be negatively impacted. If securities or industry analysts cover us and if one or more of such analysts downgrade our stock or publish inaccurate or unfavorable research about our business, our stock price would likely decline. If one or more of the analysts covering us fail to publish reports on us regularly, demand for our stock could decline, which could cause our stock price and trading volume to decline.

If We Issue Additional Equity Securities or Issue Additional Convertible Debt to Raise Capital, It May Have a Dilutive Effect on Shareholders’ Investment.

If we raise additional capital through further issuances of equity or convertible debt securities, our existing shareholders could suffer significant dilution in their percentage ownership of us. Moreover, any new equity securities we issue could have rights, preferences and privileges senior to those of holders of our common stock.

The Capped Call Transactions May Affect the Value of Our 2021 Notes, Our 2023 Notes, and Our Class C Capital Stock.

In connection with the pricing of each of the 2021 Notes and 2023 Notes, we entered into capped call transactions with certain financial institutions (the “option counterparties”). The capped call transactions are expected generally to reduce the potential dilution upon conversion of the 2021 Notes or 2023 Notes and/or offset any cash payments we are required to make in excess of the principal amount of converted notes, as the case may be.

The option counterparties or their respective affiliates may modify their hedge positions by entering into or unwinding various derivative transactions with respect to our Class C capital stock and/or purchasing or selling our Class C capital stock or other securities of ours in secondary market transactions prior to the maturity of each of the 2021 Notes and 2023 Notes (and are likely to do so during any observation period related to a conversion of 2021 Notes or 2023 Notes or in connection with any repurchase of 2021 Notes or 2023 Notes by us). This activity could cause or avoid an increase or a decrease in the market price of our Class C capital stock, the 2021 Notes or the 2023 Notes.

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Anti-Takeover Provisions in Our Charter Documents and Under Washington Law Could Make an Acquisition of Us More Difficult, Limit Attempts by Shareholders to Replace or Remove Our Management and Affect the Market Price of Our Stock.

Provisions in our articles of incorporation and bylaws, as amended and restated, may have the effect of delaying or preventing a change of control or changes in our management. Our amended and restated articles of incorporation or amended and restated bylaws include provisions, some of which will become effective only after the date, which we refer to as the threshold date, on which the Class B common stock controlled by our founders represents less than 7% of the aggregate number of shares of our outstanding Class A common stock and Class B common stock, that:

• set forth the structure of our capital stock, which concentrates voting control of matters submitted to a vote of our shareholders with the holders of our Class B common stock, which is held or controlled by our founders;

• authorize our board of directors to issue, without further action by our shareholders, up to 30,000,000 shares of undesignated preferred stock, subject, prior to the threshold date, to the approval rights of the holders of our Class B common stock;

• establish that our board of directors will be divided into three classes, Class I, Class II and Class III, with each class serving three-year staggered terms;

• prohibit cumulative voting in the election of directors;

• provide that, after the threshold date, our directors may be removed only for cause;

• provide that, after the threshold date, vacancies on our board of directors may be filled only by the affirmative vote of a majority of directors then in office or by the sole remaining director;

• provide that only our board of directors may change the board’s size;

• specify that special meetings of our shareholders can be called only by the chair of our board of directors, our board of directors, our chief executive officer, our president or, prior to the threshold date, holders of at least 25% of all the votes entitled to be cast on any issue proposed to be considered at any such special meeting;

• establish an advance notice procedure for shareholder proposals to be brought before a meeting of shareholders, including proposed nominations of persons for election to our board of directors;

• require the approval of our board of directors or the holders of at least two-thirds of all the votes entitled to be cast by shareholders generally in the election of directors, voting together as a single group, to amend or repeal our bylaws; and

• require the approval of not less than two-thirds of all the votes entitled to be cast on a proposed amendment, voting together as a single group, to amend certain provisions of our articles of incorporation.

Prior to the threshold date, our directors can be removed with or without cause by holders of our Class A common stock and Class B common stock, voting together as a single group, and vacancies on the board of directors may be filled by such shareholders, voting together as a single group. Given the structure of our capital stock, our founders, Richard Barton and Lloyd Frink, who hold or control our Class B common stock, will have the ability for the foreseeable future to control these shareholder actions. See the risk factor above titled “The Structure of Our Capital Stock as Contained in Our Charter Documents Has the Effect of Concentrating Voting Control With our Founders, and Limits Your Ability to Influence Corporate Matters.”

The provisions described above, after the threshold date, may frustrate or prevent any attempts by our shareholders to replace or remove our current management by making it more difficult for shareholders to replace members of our board of directors, which board is responsible for appointing our management. In addition, because we are incorporated in the State of Washington, we are governed by the provisions of Chapter 23B.19 of the Washington Business Corporation Act, which prohibits certain business combinations between us and certain significant shareholders unless specified conditions are met. These provisions may also have the effect of delaying or preventing a change of control of our company, even if this change of control would benefit our shareholders.

68

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 September 30, 2018.

69

Item 6. Exhibits

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

Exhibit Number	Description
10.1*	Executive Severance Agreement and Release, dated October 16, 2018, between Zillow Group, Inc. and Amy Bohutinsky (Filed as Exhibit 10.1 to Zillow Group, Inc.’s Current Report on Form 8-K filed with the Securities and Exchange Commission on October 17, 2018, and incorporated herein by reference).
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	XBRL Instance Document.
101.SCH	XBRL Taxonomy Extension Schema Document.
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document.
*	Indicates a management contract or compensatory plan or arrangement.

70

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: November 6, 2018	ZILLOW GROUP, INC.
	By:	/s/ JENNIFER ROCK
	Name:	Jennifer Rock
	Title:	Interim Chief Financial Officer and Chief Accounting Officer

71

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, Spencer M. Rascoff, certify that:

1. I have reviewed this report on Form 10-Q of Zillow Group, Inc. for the fiscal quarter ended September 30, 2018;

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/ SPENCER M. RASCOFF
Name:	Spencer M. Rascoff
Title:	Chief Executive Officer
Date:	November 6, 2018

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, Jennifer Rock, certify that:

1. I have reviewed this report on Form 10-Q of Zillow Group, Inc. for the fiscal quarter ended September 30, 2018;

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/ JENNIFER ROCK
Name:	Jennifer Rock
Title:	Interim Chief Financial Officer and Chief Accounting Officer
Date:	November 6, 2018

EX-32.1

EXHIBIT 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

In connection with the Quarterly Report on Form 10-Q of Zillow Group, Inc. (the “Company”) for the fiscal quarter ended September 30, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Spencer M. Rascoff, 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/ SPENCER M. RASCOFF
Name:	Spencer M. Rascoff
Title:	Chief Executive Officer
Date:	November 6, 2018

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 September 30, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Jennifer Rock, Interim Chief Financial Officer and Chief Accounting 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/ JENNIFER ROCK
Name:	Jennifer Rock
Title:	Interim Chief Financial Officer and Chief Accounting Officer
Date:	November 6, 2018

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 31, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Trading Symbol	ZG
Entity Registrant Name	ZILLOW GROUP, INC.
Entity Central Index Key	0001617640
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		57,986,928
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		6,217,447
Class C Capital Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		139,042,266

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 643,792	$ 352,095
Short-term investments	999,241	410,444
Accounts receivable, net of allowance for doubtful accounts of $5,276 and $5,341 at September 30, 2018 and December 31, 2017, respectively	66,337	54,396
Inventory	43,257	0
Prepaid expenses and other current assets	38,904	24,590
Restricted cash	3,203	0
Total current assets	1,794,734	841,525
Contract cost assets	45,238	0
Property and equipment, net	124,281	112,271
Goodwill	1,931,076	1,931,076
Intangible assets, net	290,887	319,711
Other assets	16,241	25,934
Total assets	4,202,457	3,230,517
Current liabilities:
Accounts payable	5,846	3,587
Accrued expenses and other current liabilities	58,533	61,373
Accrued compensation and benefits	25,612	19,109
Revolving credit facility	24,674	0
Deferred revenue	35,959	31,918
Deferred rent, current portion	2,566	2,400
Total current liabilities	153,190	118,387
Deferred rent, net of current portion	18,049	21,330
Long-term debt	690,338	385,416
Deferred tax liabilities and other long-term liabilities	21,861	44,561
Total liabilities	883,438	569,694
Commitments and contingencies (Note 17)
Shareholders’ equity:
Preferred stock, $0.0001 par value; 30,000,000 shares authorized; no shares issued and outstanding	0	0
Additional paid-in capital	3,894,757	3,254,146
Accumulated other comprehensive loss	(1,661)	(1,100)
Accumulated deficit	(574,097)	(592,243)
Total shareholders’ equity	3,319,019	2,660,823
Total liabilities and shareholders’ equity	4,202,457	3,230,517
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	$ 13	$ 13

XML

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 5,276	$ 5,341
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)	57,965,662	56,629,103
Common stock, outstanding (in shares)	57,965,662	56,629,103
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)	138,974,244	127,268,598
Common stock, outstanding (in shares)	138,974,244	127,268,598

XML

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended	9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Revenue:
Revenue		$ 343,094	$ 281,839		$ 968,219	$ 794,464
Cost of revenue (exclusive of amortization)
Cost of revenue		36,672	22,152		86,118	62,644
Sales and marketing		128,734	107,108		413,752	344,266
Technology and development		105,314	83,389		299,623	234,798
General and administrative		70,743	54,226		187,395	153,038
Impairment costs		10,000	0		10,000	0
Acquisition-related costs		1,405	218		2,064	366
Integration costs		523	0		523	0
Total costs and expenses		353,391	267,093		999,475	795,112
Income (loss) from operations		(10,297)	14,746		(31,256)	(648)
Other income		7,773	1,407		13,308	3,970
Interest expense		(12,668)	(6,906)		(26,928)	(20,526)
Income (loss) before income taxes		(15,192)	9,247		(44,876)	(17,204)
Income tax benefit (expense)		14,700	(41)	$ 8,000	22,700	(41)
Net income (loss)		$ (492)	$ 9,206		$ (22,176)	$ (17,245)
Net loss per share - basic and diluted (usd per share)		$ 0	$ 0.05		$ (0.11)	$ (0.09)
Weighted-average shares outstanding - basic (in shares)		202,416	187,692		195,208	185,447
Weighted-average shares outstanding - diluted (in shares)		202,416	196,425		195,208	185,447
Amortization of website development costs and intangible assets included in technology and development		$ 18,165	$ 23,537		$ 61,735	$ 69,957
IMT
Revenue:
Revenue		332,076	281,839		957,201	794,464
Cost of revenue (exclusive of amortization)
Cost of revenue	[1]	26,386	22,152		75,832	62,644
Sales and marketing		123,755			405,525
Technology and development		99,570			286,983
General and administrative		65,156			172,756
Impairment costs		10,000			10,000
Acquisition-related costs		1,405			2,064
Integration costs		523			523
Total costs and expenses		326,795			953,683
Income (loss) from operations		5,281			3,518
Other income		7,773			13,308
Interest expense		(12,236)			(26,496)
Income (loss) before income taxes		818			(9,670)
Homes
Revenue:
Revenue		11,018	0		11,018	0
Cost of revenue (exclusive of amortization)
Cost of revenue	[1]	10,286	$ 0		10,286	$ 0
Sales and marketing		4,979			8,227
Technology and development		5,744			12,640
General and administrative		5,587			14,639
Impairment costs		0			0
Acquisition-related costs		0			0
Integration costs		0			0
Total costs and expenses		26,596			45,792
Income (loss) from operations		(15,578)			(34,774)
Other income		0			0
Interest expense		(432)			(432)
Income (loss) before income taxes		$ (16,010)			$ (35,206)

[1] Three Months EndedSeptember 30,?Nine Months EndedSeptember 30,?2018?2017?2018?2017?____________________(1) Amortization of website development costs and intangible assets included in technology and development$18,165?$23,537?$61,735?$69,957

XML

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (492)	$ 9,206	$ (22,176)	$ (17,245)
Other comprehensive income (loss):
Unrealized gains (losses) on investments	(428)	99	(537)	(103)
Currency translation adjustments	42	0	(24)	0
Total other comprehensive income (loss)	(386)	99	(561)	(103)
Comprehensive income (loss)	$ (878)	$ 9,305	$ (22,737)	$ (17,348)

XML

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities
Net loss	$ (22,176)	$ (17,245)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	76,301	81,576
Share-based compensation expense	111,366	84,162
Amortization of contract cost assets	27,227	0
Amortization of discount and issuance costs on 2021 and 2023 Notes	17,990	13,391
Impairment costs	10,000	0
Deferred income taxes	(22,700)	0
Loss on disposal of property and equipment	3,129	4,085
Bad debt expense	1,053	5,861
Deferred rent	(3,116)	3,072
Amortization (accretion) of bond premium (discount)	(2,172)	451
Changes in operating assets and liabilities:
Accounts receivable	(12,994)	(19,272)
Inventory	(43,257)	0
Prepaid expenses and other assets	(15,012)	4,434
Contract cost assets	(32,143)	0
Accounts payable	2,254	224
Accrued expenses and other current liabilities	(3,751)	13,174
Accrued compensation and benefits	6,503	1,194
Deferred revenue	4,041	1,775
Other long-term liabilities	0	41
Net cash provided by operating activities	102,543	176,923
Investing activities
Proceeds from maturities of investments	261,675	204,520
Purchases of investments	(848,838)	(303,241)
Purchases of property and equipment	(44,482)	(51,580)
Purchases of intangible assets	(8,179)	(9,377)
Purchase of equity investment	0	(10,000)
Proceeds from divestiture of a business	0	579
Cash paid for acquisition, net	(2,000)	(11,147)
Net cash used in investing activities	(641,824)	(180,246)
Financing activities
Proceeds from issuance of 2023 Notes, net of issuance costs	364,020	0
Premiums paid for Capped Call Confirmations	(29,414)	0
Proceeds from issuance of Class C Capital Stock, net of issuance costs	360,345	0
Proceeds from borrowing on revolving credit facility	24,674	0
Proceeds from exercise of stock options	114,623	80,010
Value of equity awards withheld for tax liability	(67)	(337)
Net cash provided by financing activities	834,181	79,673
Net increase in cash, cash equivalents and restricted cash during period	294,900	76,350
Cash, cash equivalents and restricted cash at beginning of period	352,095	243,592
Cash, cash equivalents and restricted cash at end of period	646,995	319,942
Supplemental disclosures of cash flow information
Cash paid for interest	4,800	4,458
Noncash transactions:
Capitalized share-based compensation	6,674	8,915
Write-off of fully depreciated property and equipment	18,687	12,685
Write-off of fully amortized intangible assets	$ 10,797	$ 5,454

XML

Organization and Description of Business

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Organization and Description of Business

Organization and Description of Business

Zillow Group, Inc. operates the largest portfolio of real estate and home-related brands on mobile and the web which focus on all stages of the home lifecycle: renting, buying, selling and financing. Zillow Group is committed to empowering consumers with unparalleled data, inspiration and knowledge around homes, and connecting them with great real estate professionals. The Zillow Group portfolio of consumer brands includes real estate and rental marketplaces Zillow, Trulia, StreetEasy, HotPads, Naked Apartments, RealEstate.com and Out East. In addition, Zillow Group provides a comprehensive suite of marketing software and technology solutions to help real estate professionals maximize business opportunities and connect with millions of consumers. Beginning in April of 2018, Zillow Offers provides homeowners in certain metropolitan areas with the opportunity to receive offers to purchase their home from Zillow. When Zillow buys a home, it makes certain repairs and updates and lists the home for resale on the open market. We also own and operate a number of business brands for real estate, rental and mortgage professionals, including 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”). Upon the closing of the Trulia acquisition in February 2015, each of Zillow, Inc. and Trulia became wholly owned subsidiaries of Zillow Group.

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: rates of revenue growth; 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 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; our ability to successfully integrate and realize the benefits of our past or future strategic acquisitions or investments; 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

9 Months Ended

Sep. 30, 2018

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, 2017, which was filed with the SEC on February 15, 2018. The condensed consolidated balance sheet as of December 31, 2017, 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 September 30, 2018, our results of operations and comprehensive income (loss) for the three and nine month periods ended September 30, 2018 and 2017, and our cash flows for the nine month periods ended September 30, 2018 and 2017. The results of the three and nine month periods ended September 30, 2018 are not necessarily indicative of the results to be expected for the year ending December 31, 2018 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 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 with definite lives, share-based compensation, income taxes, business combinations, and the recoverability of goodwill and indefinite-lived intangible assets, among others. To the extent there are material differences between these estimates, judgments, or assumptions and actual results, our financial statements will be affected.

Recently Adopted Accounting Standards

In May 2014, the Financial Accounting Standards Board (“FASB”) issued guidance on revenue from contracts with customers. The guidance states that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those products or services. It also states that an entity should recognize as an asset the incremental costs of obtaining a contract that the entity expects to recover and amortize the costs consistent with the transfer to the customer of the products or services to which the asset relates. The guidance requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. We adopted this guidance effective January 1, 2018 using the modified retrospective transition approach applied to all contracts at the date of initial application. We recorded an adjustment of $40.3 million to decrease accumulated deficit as of January 1, 2018 related to the accounting for the cost of sales commissions, primarily related to sales commissions for our Premier Agent and Premier Broker advertising products. Historically, we expensed these sales commission costs as incurred, but under the new guidance, the cost of certain sales commissions is recorded as a contract cost asset and recognized as an operating expense over the period that we expect to recover the costs.

The amount by which each financial statement line item is affected by the application of this guidance for the three months ended September 30, 2018 is as follows (in thousands, except per share data):

	New Guidance			Prior Guidance			Change
Condensed Consolidated Statement of Operations:
Sales and marketing	$	128,734		$	130,588		$	(1,854	)
Total costs and expenses	353,391			355,245			(1,854		)
Loss from operations	(10,297		)	(12,151		)	1,854
Loss before income taxes	(15,192		)	(17,046		)	1,854
Income tax benefit	14,700			14,992			(292		)
Net loss	(492		)	(2,054		)	1,562
Net loss per share — basic and diluted	—			(0.01		)	0.01

The amount by which each financial statement line item is affected by the application of this guidance as of and for the nine months ended September 30, 2018 is as follows (in thousands, except per share data):

	New Guidance			Prior Guidance			Change
Condensed Consolidated Statement of Operations:
Sales and marketing	$	413,752		$	418,668		$	(4,916	)
Total costs and expenses	999,475			1,004,391			(4,916		)
Loss from operations	(31,256		)	(36,172		)	4,916
Loss before income taxes	(44,876		)	(49,792		)	4,916
Income tax benefit	22,700			23,892			(1,192		)
Net loss	(22,176		)	(25,900		)	3,724
Net loss per share — basic and diluted	(0.11		)	(0.13		)	0.02
Condensed Consolidated Balance Sheet:
Contract cost assets	45,238			—			45,238
Total assets	4,202,457			4,157,219			45,238
Deferred tax liabilities and other long-term liabilities	21,861			20,669			1,192
Total liabilities	883,438			882,246			1,192
Accumulated deficit	(574,097		)	(619,335		)	45,238
Total shareholders’ equity	3,319,019			3,282,422			36,597
Total liabilities and shareholders’ equity	4,202,457			4,157,219			45,238

Recently Issued Accounting Standards Not Yet Adopted

In August 2018, the FASB issued guidance related to a customer’s accounting for implementation costs incurred in hosting arrangements. The guidance aligns the requirements for capitalizing implementation costs incurred in cloud computing arrangements with the requirements for capitalizing costs to develop or obtain internal-use software. This guidance is effective for interim and annual reporting periods beginning after December 15, 2019, and early adoption is permitted. This guidance may be applied either retrospectively or prospectively. We expect to adopt this guidance on January 1, 2020. We have not yet determined the impact the adoption of this guidance will have on our financial position, results of operations or cash flows.

In August 2018, the FASB issued guidance related to disclosure requirements for fair value measurements. This guidance removes, modifies and adds disclosures related to fair value measurements. This guidance is effective for interim and annual periods beginning after December 15, 2019, and early adoption is permitted. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim and annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. We expect to adopt this guidance on January 1, 2020. We have not yet determined the impact the adoption of this guidance will have on our financial statement disclosures.

In June 2018, the FASB issued guidance related to contributions received and made. This guidance assists entities with evaluating whether a transfer of assets is considered a contribution or an exchange transaction. This guidance is effective for interim and annual reporting periods beginning after June 15, 2018 for contributions received and after December 15, 2018 for contributions made, and early adoption is permitted. The guidance should be applied on a modified prospective basis, though retrospective application is permitted. We expect to adopt this guidance on January 1, 2019. The adoption of this guidance is not expected to have a material impact on our financial position, results of operations or cash flows.

In February 2018, the FASB issued guidance on income tax accounting related to the Tax Act. This guidance permits a reclassification from accumulated other comprehensive income (loss) to accumulated deficit for the adjustment of deferred taxes due to the reduction of the historical corporate income tax rate to the newly enacted corporate income tax rate under the Tax Act. It also requires certain disclosures regarding these reclassifications. The guidance is effective for interim and annual reporting periods beginning after December 15, 2018, and early adoption is permitted. This guidance must be applied either on a prospective basis in the period of adoption or retrospectively to each period in which the effect of the change in the corporate income tax rate is recognized. We expect to adopt this guidance on January 1, 2019. The adoption of this guidance is not expected to have a material impact on our financial position, results of operations or cash flows.

In March 2017, the FASB issued guidance related to the premium amortization on purchased callable debt securities. This guidance shortens the amortization period for certain callable debt securities purchased at a premium by requiring that the premium be amortized to the earliest call date. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, and early adoption is permitted. This guidance must be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. We expect to adopt this guidance on January 1, 2019. The adoption of this guidance is not expected to have a material impact on our financial position, results of operations or cash flows.

In June 2016, the FASB issued guidance on the measurement of credit losses on financial instruments. This guidance requires the use of an expected loss impairment model for instruments measured at amortized cost. For available-for-sale debt securities, an entity is required to recognize credit losses through an allowance for credit losses rather than as a write-down. This guidance is effective for interim and annual reporting periods beginning after December 15, 2019, and early adoption is permitted for interim and annual reporting periods beginning after December 15, 2018. The adoption of this guidance requires a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. We expect to adopt this guidance on January 1, 2020. We have not yet determined the impact the adoption of this guidance will have on our financial position, results of operations or cash flows.

In February 2016, the FASB issued guidance on leases. This guidance requires the recognition of a right-of-use asset and lease liability on the balance sheet for all leases. This guidance also requires more detailed disclosures to enable users of financial statements to understand the amount, timing, and uncertainty of cash flows arising from leases. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018. In July 2018, the FASB issued certain targeted improvements to the accounting and disclosure requirements for leases, including an additional optional transition method that allows entities to initially apply the new standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption without restating prior periods. We will adopt this guidance on January 1, 2019 using the optional transition method. Under this approach, we will not restate the prior financial statements presented. As we progress through our implementation of this guidance, we continue to expect a significant impact on our financial position upon adoption, primarily due to our office space operating leases, as we will be required to recognize lease assets and lease liabilities on our condensed consolidated balance sheet. As our leases do not provide an implicit rate, we plan to use our incremental borrowing rate based on information available at the commencement date to determine the present value of future payments. We continue to evaluate the incremental borrowing rate, changes to our internal control structure, accounting policies and disclosures. We continue to assess the impact the adoption will have on our results of operations and cash flows.

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Fair Value Measurements

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

Accounting standards define fair value as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market in an orderly transaction between market participants on the measurement date. The standards also establish a fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value:

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

• Level 2—Assets and liabilities valued based on observable market data for similar instruments, such as quoted prices for similar assets or liabilities.

• Level 3—Unobservable inputs that are supported by little or no market activity; instruments valued based on the best available data, some of which is internally developed, and considers risk premiums that a market participant would require.

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. The fair value measurement of corporate notes and bonds, commercial paper, U.S. government agency securities and certificates of deposit 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.

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.

Restricted cash — Restricted cash consists of cash received from the resale of homes through Zillow Offers which is used to repay amounts borrowed on the Revolving Credit Facility (see Note 12) as well as certain reserves we are required to maintain pursuant to the Revolving Credit Facility. The carrying value of restricted cash approximates fair value due to the short period of time amounts borrowed on the Revolving Credit Facility are outstanding.

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

	September 30, 2018
	Total		Level 1		Level 2
Cash equivalents:
Money market funds	$	543,703	$	543,703	$	—
Commercial paper	3,490		—		3,490
Certificates of deposit	249		—		249
Short-term investments:
U.S. government agency securities	717,927		—		717,927
Corporate notes and bonds	121,875		—		121,875
Commercial paper	92,674		—		92,674
Municipal securities	43,154		—		43,154
Foreign government securities	17,905		—		17,905
Certificates of deposit	5,706		—		5,706
Total	$	1,546,683	$	543,703	$	1,002,980

	December 31, 2017
	Total		Level 1		Level 2
Cash equivalents:
Money market funds	$	233,508	$	233,508	$	—
Corporate notes and bonds	6,199		—		6,199
Commercial paper	3,987		—		3,987
U.S. government agency securities	1,748		—		1,748
Certificates of deposit	249		—		249
Short-term investments:
U.S. government agency securities	298,758		—		298,758
Corporate notes and bonds	44,607		—		44,607
Commercial paper	39,325		—		39,325
Municipal securities	11,459		—		11,459
Certificates of deposit	10,297		—		10,297
Foreign government securities	5,998		—		5,998
Total	$	656,135	$	233,508	$	422,627

See Note 12 for the carrying amount and estimated fair value of the Company’s Convertible Senior Notes due in 2023, Convertible Senior Notes due in 2021 and Trulia’s Convertible Senior Notes due in 2020.

We did not have any Level 3 assets as of September 30, 2018 or December 31, 2017. There were no liabilities measured at fair value on a recurring basis as of September 30, 2018 or December 31, 2017.

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

9 Months Ended

Sep. 30, 2018

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, available-for-sale investments and restricted cash as of the dates presented (in thousands):

	September 30, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	96,350	$	—	$	—		$	96,350
Cash equivalents:
Money market funds	543,703		—		—			543,703
Commercial paper	3,490		—		—			3,490
Certificates of deposit	249		—		—			249
Short-term investments:
U.S. government agency securities	719,380		—		(1,453		)	717,927
Corporate notes and bonds	121,987		1		(113		)	121,875
Commercial paper	92,674		—		—			92,674
Municipal securities	43,237		—		(83		)	43,154
Foreign government securities	17,940		—		(35		)	17,905
Certificates of deposit	5,706		1		(1		)	5,706
Restricted cash	3,203		—		—			3,203
Total	$	1,647,919	$	2	$	(1,685	)	$	1,646,236

	December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	106,404	$	—	$	—		$	106,404
Cash equivalents:
Money market funds	233,508		—		—			233,508
Corporate notes and bonds	6,200		—		(1		)	6,199
Commercial paper	3,987		—		—			3,987
U.S. government agency securities	1,748		—		—			1,748
Certificates of deposit	249		—		—			249
Short-term investments:
U.S. government agency securities	299,814		—		(1,056		)	298,758
Corporate notes and bonds	44,661		1		(55		)	44,607
Commercial paper	39,325		—		—			39,325
Municipal securities	11,494		—		(35		)	11,459
Certificates of deposit	10,296		2		(1		)	10,297
Foreign government securities	6,000		—		(2		)	5,998
Total	$	763,686	$	3	$	(1,150	)	$	762,539

The following table presents available-for-sale investments by contractual maturity date as of September 30, 2018 (in thousands):

	Amortized Cost		Estimated Fair Market Value
Due in one year or less	$	846,217	$	844,993
Due after one year through two years	154,707		154,248
Total	$	1,000,924	$	999,241

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Accounts Receivable, net

9 Months Ended

Sep. 30, 2018

Receivables [Abstract]

Accounts Receivable, net

Accounts Receivable, net

The opening balance of accounts receivable, net was $54.4 million as of January 1, 2018.

The following table presents the changes in the allowance for doubtful accounts (in thousands):

Balance as of January 1, 2018	$	5,341
Bad debt expense	1,053
Less: write-offs, net of recoveries and other adjustments	(1,118		)
Balance as of September 30, 2018	$	5,276

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Inventory

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Inventory

Inventory

The components of inventory, net of applicable lower of cost or net realizable value write-downs, were as follows (in thousands):

	September 30, 2018		December 31, 2017
Work-in-progress	$	16,010	$	—
Finished goods	27,247		—
Inventory	$	43,257	$	—

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Contract Cost Assets

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Contract Cost Assets

Contract Cost AssetsAs of September 30, 2018, we had $45.2 million of contract cost assets. During the three and nine month periods ended September 30, 2018, we recorded no impairment losses. During the three and nine month periods ended September 30, 2018, we recorded $8.9 million and $27.2 million, respectively, of amortization expense related to contract cost assets.Deferred Revenue

The following tables present the changes in deferred revenue for the periods presented (in thousands):

	Three Months Ended September 30, 2018
Balance as of July 1, 2018	$	35,920
Deferral of revenue	253,571
Less: Revenue recognized	(253,532		)
Balance as of September 30, 2018	$	35,959

	Nine Months Ended September 30, 2018
Balance as of January 1, 2018	$	31,918
Deferral of revenue	742,427
Less: Revenue recognized	(738,386		)
Balance as of September 30, 2018	$	35,959

During the three months ended September 30, 2018, we recognized as revenue a total of $33.0 million pertaining to amounts that were recorded in deferred revenue as of June 30, 2018. During the nine months ended September 30, 2018, we recognized as revenue a total of $30.6 million pertaining to amounts that were recorded in deferred revenue as of December 31, 2017.

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Property and Equipment, net

9 Months Ended

Sep. 30, 2018

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):

	September 30, 2018			December 31, 2017
Website development costs	$	147,416		$	130,072
Leasehold improvements	58,354			47,321
Computer equipment	30,896			30,071
Construction-in-progress	26,150			28,150
Office equipment, furniture and fixtures	26,221			22,887
Property and equipment	289,037			258,501
Less: accumulated amortization and depreciation	(164,756		)	(146,230		)
Property and equipment, net	$	124,281		$	112,271

We recorded depreciation expense related to property and equipment (other than website development costs) of $5.1 million and $3.8 million, respectively, during the three months ended September 30, 2018 and 2017, and $14.2 million and $11.5 million, respectively, during the nine months ended September 30, 2018 and 2017.

We capitalized $8.0 million and $13.4 million, respectively, in website development costs during the three months ended September 30, 2018 and 2017, and $26.6 million and $39.8 million, respectively, during the nine months ended September 30, 2018 and 2017. Amortization expense for website development costs included in technology and development expenses was $6.2 million and $10.1 million, respectively, during the three months ended September 30, 2018 and 2017, and $24.2 million and $30.0 million, respectively, during the nine months ended September 30, 2018 and 2017.

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Equity Investments

9 Months Ended

Sep. 30, 2018

Equity Method Investments and Joint Ventures [Abstract]

Equity Investments

Equity Investments

In June 2017, we purchased an equity interest in a privately held corporation for approximately $10.0 million.

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. The entity is financed through its business operations. We are not the primary beneficiary of the entity, as we do not direct the activities that most significantly impact the entity’s economic performance. Therefore, we do not consolidate the entity. Our maximum exposure to loss is $10.0 million, the carrying amount of the investment as of September 30, 2018.

These investments are equity securities without readily determinable fair values which we account for at cost minus any impairment, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments of the same issuer. During the three months ended September 30, 2018, we recognized a non-cash impairment charge of $10.0 million related to our June 2017 investment. The impairment charge is included in Impairment costs within our condensed consolidated statements of operations. In connection with our quarterly qualitative assessment of this investment for impairment indicators, we identified factors that led us to conclude that the investment was impaired and the fair value of the investment was less than the carrying value. The most significant of such factors was related to the business prospects of the investee. Accordingly, we performed an analysis to determine the fair value of the investment and concluded that our best estimate of its fair value was $0.0 million as of September 30, 2018. This is considered a Level 3 measurement under the fair value hierarchy.

There has been no impairment or upward or downward adjustments for our October 2016 equity investment as of September 30, 2018 that would impact the carrying amount of the investment. The October 2016 investment is classified within other assets in the condensed consolidated balance sheet.

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Intangible Assets, net

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets, net

Intangible Assets, net

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

	September 30, 2018
	Cost		Accumulated Amortization			Net
Purchased content	$	39,105	$	(27,978	)	$	11,127
Software	21,893		(12,534		)	9,359
Customer relationships	103,900		(57,304		)	46,596
Developed technology	111,980		(69,137		)	42,843
Trade names and trademarks	4,900		(4,658		)	242
Intangibles-in-progress	3,720		—			3,720
Total	$	285,498	$	(171,611	)	$	113,887

	December 31, 2017
	Cost		Accumulated Amortization			Net
Purchased content	$	35,260	$	(20,480	)	$	14,780
Software	18,957		(8,899		)	10,058
Customer relationships	103,900		(46,365		)	57,535
Developed technology	113,380		(56,664		)	56,716
Trade names and trademarks	4,900		(3,943		)	957
Advertising relationships	9,000		(8,525		)	475
Intangibles-in-progress	2,190		—			2,190
Total	$	287,587	$	(144,876	)	$	142,711

Amortization expense recorded for intangible assets for the three months ended September 30, 2018 and 2017 was $12.0 million and $13.4 million, respectively. Amortization expense recorded for intangible assets for the nine months ended September 30, 2018 and 2017 was $37.6 million and $39.9 million, respectively. These amounts are included in technology and development expenses.

We have an indefinite-lived intangible asset that we recorded in connection with our February 2015 acquisition of Trulia for Trulia’s trade names and trademarks that is not subject to amortization. The carrying value of the Trulia trade names and trademarks intangible asset was $177.0 million as of September 30, 2018 and December 31, 2017.

Intangibles-in-progress consists of software that is capitalizable but has not been placed in service.

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Deferred Revenue

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Deferred Revenue

Contract Cost AssetsAs of September 30, 2018, we had $45.2 million of contract cost assets. During the three and nine month periods ended September 30, 2018, we recorded no impairment losses. During the three and nine month periods ended September 30, 2018, we recorded $8.9 million and $27.2 million, respectively, of amortization expense related to contract cost assets.Deferred Revenue

The following tables present the changes in deferred revenue for the periods presented (in thousands):

	Three Months Ended September 30, 2018
Balance as of July 1, 2018	$	35,920
Deferral of revenue	253,571
Less: Revenue recognized	(253,532		)
Balance as of September 30, 2018	$	35,959

	Nine Months Ended September 30, 2018
Balance as of January 1, 2018	$	31,918
Deferral of revenue	742,427
Less: Revenue recognized	(738,386		)
Balance as of September 30, 2018	$	35,959

During the three months ended September 30, 2018, we recognized as revenue a total of $33.0 million pertaining to amounts that were recorded in deferred revenue as of June 30, 2018. During the nine months ended September 30, 2018, we recognized as revenue a total of $30.6 million pertaining to amounts that were recorded in deferred revenue as of December 31, 2017.

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Debt

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Debt

Debt

Revolving Credit Facility

On July 31, 2018, certain wholly owned subsidiaries of Zillow Group entered into a revolving credit agreement with Credit Suisse AG, Cayman Islands Branch, as the directing lender, and certain other parties thereto (the “Revolving Credit Facility”). The Revolving Credit Facility provides for a maximum borrowing capacity of $250.0 million (the “Maximum Amount”) with a current borrowing capacity of $25.0 million as of September 30, 2018, which amount may be increased up to the Maximum Amount subject to the satisfaction of certain conditions, through a non-recourse credit facility secured by a pledge of the equity of certain Zillow Group subsidiaries that purchase and sell select residential properties through Zillow Offers. In certain circumstances Zillow Group may be obligated to fund some or all of the payment obligations under the Revolving Credit Facility. Zillow Group formed certain special purpose entities to effectuate the transactions contemplated by the agreement underlying the Revolving Credit Facility. Each special purpose entity is a wholly owned subsidiary of Zillow Group and a separate legal entity, and neither the assets nor credit of any such entity are available to satisfy the debts and other obligations of any affiliate or other entity.

The Revolving Credit Facility has an initial term of one year which may be extended for up to three years, subject to agreement by the directing lender. The Revolving Credit Facility includes customary representations and warranties, covenants (including financial covenants applicable to Zillow Group), and provisions regarding events of default. As of September 30, 2018, Zillow Group was in compliance with all financial covenants and no event of default had occurred. Availability under the Revolving Credit Facility is limited by a formula equal to the lower of 85% of the aggregate acquisition cost of financed residential properties or 85% of the aggregate market value, which for each residential property is the sum of the value established by an independent broker-pricing opinion and renovation costs paid.

Pursuant to the terms of the Revolving Credit Facility, we are required to establish, maintain, and in certain circumstances fund, certain specified reserve accounts. These reserve accounts include, but are not limited to, interest reserves, insurance, tax and HOA fee reserves, renovation cost reserves and special reserves. The credit facility reserve accounts and the collection account into which funds are deposited upon the resale of financed residential properties, which funds are used to repay amounts borrowed on the Revolving Credit Facility, are under the sole control of Credit Suisse AG, New York Branch, as defined in the agreement governing the Revolving Credit Facility. Amounts funded to these reserve accounts and the collection account have been classified within our condensed consolidated balance sheets as restricted cash. Borrowings on our Revolving Credit Facility bear interest at the one-month London Interbank Offered Rate (“LIBOR”) plus an applicable margin. We are also required to pay a funding fee for each financed residential property and certain other fees to certain other parties to the agreement. Interest, funding fees and other fees, including the amortization of deferred issuance costs, are classified within interest expense in our condensed consolidated statements of operations.

As of September 30, 2018, we have outstanding $24.7 million of borrowings on the Revolving Credit Facility and approximately $0.3 million is currently available for future borrowings.

Convertible Senior Notes due in 2023

On July 3, 2018, Zillow Group issued $373.8 million aggregate principal amount of Convertible Senior Notes due 2023 (the “2023 Notes”), which includes $48.8 million principal amount of 2023 Notes sold pursuant to the underwriters’ option to purchase additional 2023 Notes. The 2023 Notes bear interest at a fixed rate of 1.50% per year, payable semiannually in arrears on January 1 and July 1 of each year, beginning on January 1, 2019. The 2023 Notes are convertible into cash, shares of Class C capital stock or a combination thereof, at our election. The 2023 Notes will mature on July 1, 2023, unless earlier repurchased, redeemed, or converted in accordance with their terms.

The net proceeds from the issuance of the 2023 Notes were approximately $364.0 million, after deducting underwriting discounts and commissions and offering expenses payable by the Company. We used approximately $29.4 million of the net proceeds from the issuance of the 2023 Notes to pay the cost of the Capped Call Confirmations described below. The Company intends to use the remainder of the net proceeds for general corporate purposes.

Prior to the close of business on the business day immediately preceding April 1, 2023, the 2023 Notes are convertible at the option of the holders only under certain conditions. On or after April 1, 2023, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their 2023 Notes at their option at the conversion rate then in effect, irrespective of these conditions. The Company will settle conversions of the 2023 Notes by paying or delivering, as the case may be, cash, shares of the Company’s Class C capital stock, or a combination of cash and shares of Class C capital stock, at its election. The conversion rate will initially be 12.7592 shares of Class C capital stock per $1,000 principal amount of 2023 Notes (equivalent to an initial conversion price of approximately $78.37 per share of Class C capital stock). The conversion rate is subject to customary adjustments upon the occurrence of certain events. The Company may redeem for cash all or part of the 2023 Notes, at its option, on or after July 6, 2021, under certain circumstances at a redemption price equal to 100% of the principal amount of the 2023 Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date (as defined in the indenture governing the 2023 Notes). The conversion option does not meet the criteria for separate accounting as a derivative as it is indexed to our own stock.

If the Company undergoes a fundamental change (as defined in the indenture governing the 2023 Notes), holders may require the Company to repurchase for cash all or part of their 2023 Notes at a repurchase price equal to 100% of the principal amount of the 2023 Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date (as defined in the indenture governing the 2023 Notes). In addition, if certain fundamental changes occur, the Company may be required in certain circumstances to increase the conversion rate for any Notes converted in connection with such fundamental changes by a specified number of shares of its Class C capital stock. Certain events are also considered “Events of Default,” which may result in the acceleration of the maturity of the 2023 Notes, as described in the indenture governing the 2023 Notes. There are no financial covenants associated with the 2023 Notes.

We may not redeem the 2023 Notes prior to July 6, 2021. We may redeem for cash all or any portion of the 2023 Notes, at our option, in whole or in part on or after July 6, 2021 if the last reported sale price per share of our Class C capital stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period.

In accounting for the issuance of the 2023 Notes, the Company separated the 2023 Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component, representing the conversion

option, was determined by deducting the fair value of the liability component from the par value of the 2023 Notes. The difference between the principal amount of the 2023 Notes and the liability component represents the debt discount, which is recorded as a direct deduction from the related debt liability in the condensed consolidated balance sheet and amortized to interest expense using the effective interest method over the term of the 2023 Notes. The equity component of the 2023 Notes of approximately $78.6 million is included in additional paid-in capital in the condensed consolidated balance sheet and is not remeasured as long as it continues to meet the conditions for equity classification.

Interest expense related to the 2023 Notes for the three and nine month periods ended September 30, 2018 was $5.0 million, which is comprised of approximately $3.6 million related to the amortization of debt discount and debt issuance costs and $1.4 million for the contractual coupon interest.

The effective interest rate on the liability component of the 2023 Notes for the three and nine month periods ended September 30, 2018 is 6.99%. Accrued interest related to the 2023 Notes as of September 30, 2018 was $1.4 million and is recorded in accrued expenses and other current liabilities in the condensed consolidated balance sheet.

The following table presents the outstanding principal amount and carrying value of the 2023 Notes as of the date presented (in thousands):

	Outstanding Principal Amount		Unamortized Debt Discount and Debt Issuance Costs			Carrying Value
September 30, 2018	$	373,750	$	(82,717	)	$	291,033

As of September 30, 2018, the unamortized debt discount and debt issuance costs for the 2023 Notes will be amortized to interest expense over a remaining period of approximately 57 months.

The estimated fair value of the 2023 Notes was $344.3 million as of September 30, 2018. The estimated fair value of the 2023 Notes was determined through consideration of quoted market prices. The fair value is classified as Level 3 due to the limited trading activity for the 2023 Notes.

The Capped Call Confirmations are expected generally to reduce the potential dilution of our Class C capital stock upon any conversion of 2023 Notes and/or offset the cash payments the Company is required to make in excess of the principal amount of the 2023 Notes in the event that the market price of the Class C capital stock is greater than the strike price of the Capped Call Confirmations (which initially corresponds to the initial conversion price of the 2023 Notes and is subject to certain adjustments under the terms of the Capped Call Confirmations), with such reduction and/or offset subject to a cap based on the cap price of the Capped Call Confirmations. The Capped Call Confirmations have an initial cap price of $105.45 per share, which represents a premium of approximately 85% over the public offering price of the Company’s Class C capital stock in the concurrent share offering of $57.00, and is subject to certain adjustments under the terms of the Capped Call Confirmations. The Capped Call Confirmations will cover, subject to anti-dilution adjustments substantially similar to the 2023 Notes, the number of shares of Class C capital stock that will underlie the 2023 Notes. The Capped Call Confirmations do not meet the criteria for separate accounting as a derivative as they are indexed to our own stock. The premiums paid for the Capped Call Confirmations have been included as a net reduction to additional paid-in-capital within shareholders’ equity.

Convertible Senior Notes due in 2021

On December 12, 2016, Zillow Group issued $460.0 million aggregate principal amount of 2.00% Convertible Senior Notes due 2021 (the “2021 Notes”), which amount includes the exercise in full of the $60.0 million over-allotment option, to Citigroup Global Markets Inc. as the initial purchaser of the 2021 Notes in a private offering to the initial purchaser in reliance on the exemption from the registration requirements provided by Section 4(a)(2) of the Securities Act of 1933, as amended (the “Securities Act”) for resale to qualified institutional buyers as defined in, and pursuant to, Rule 144A under the Securities Act. The 2021 Notes bear interest at a fixed rate of 2.00% per year, payable semiannually in arrears on June 1 and December 1 of each year. The 2021 Notes are convertible into cash, shares of our Class C capital stock or a combination thereof, at the Company’s election. The 2021 Notes will mature on December 1, 2021, unless earlier repurchased, redeemed, or converted in accordance with their terms.

The net proceeds from the issuance of the 2021 Notes were approximately $447.8 million, after deducting fees and expenses. The Company used approximately $370.2 million of the net proceeds from the issuance of the 2021 Notes to repurchase a portion of the outstanding 2020 Notes (see additional information below under “Trulia’s Convertible Senior Notes due 2020”) in privately negotiated transactions. In addition, the Company used approximately $36.6 million of the net proceeds from the issuance of the 2021 Notes to pay the cost of the capped call transactions with the initial purchaser of the 2021 Notes and two additional financial institutions (“Capped Call Confirmations”) as discussed further below. The Company used the remainder of the net proceeds for general corporate purposes.

Prior to the close of business on the business day immediately preceding September 1, 2021, the 2021 Notes are convertible at the option of the holders of the 2021 Notes only under certain conditions, none of which conditions have been satisfied as of September 30, 2018. On or after September 1, 2021, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders of the 2021 Notes may convert their 2021 Notes at their option at the conversion rate then in effect, irrespective of these conditions. The Company will settle conversions of the 2021 Notes by paying or delivering, as the case may be, cash, shares of Class C capital stock, or a combination of cash and shares of Class C capital stock, at its election. The conversion rate will initially be 19.0985 shares of Class C capital stock per $1,000 principal amount of 2021 Notes (equivalent to an initial conversion price of approximately $52.36 per share of Class C capital stock). The conversion rate is subject to customary adjustments upon the occurrence of certain events. The Company may redeem for cash all or part of the 2021 Notes, at its option, on or after December 6, 2019, under certain circumstances at a redemption price equal to 100% of the principal amount of the 2021 Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date (as defined in the indenture governing the 2021 Notes). The conversion option does not meet the criteria for separate accounting as a derivative as it is indexed to our own stock.

If the Company undergoes a fundamental change (as defined in the indenture governing the 2021 Notes), holders of the 2021 Notes may require the Company to repurchase for cash all or part of their 2021 Notes at a repurchase price equal to 100% of the principal amount of the 2021 Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date (as defined in the indenture governing the 2021 Notes). In addition, if certain fundamental changes occur, the Company may be required in certain circumstances to increase the conversion rate for any 2021 Notes converted in connection with such fundamental changes by a specified number of shares of its Class C capital stock. Certain events are also considered “Events of Default,” which may result in the acceleration of the maturity of the 2021 Notes, as described in the indenture governing the notes. There are no financial covenants associated with the 2021 Notes.

We may not redeem the 2021 Notes prior to December 6, 2019. We may redeem the 2021 Notes for cash, at our option, in whole or in part on or after December 6, 2019, if the last reported sale price per share of our Class C capital stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period.

Interest expense related to the 2021 Notes for the three months ended September 30, 2018 was $7.2 million, which is comprised of approximately $4.9 million related to the amortization of debt discount and debt issuance costs and $2.3 million for the contractual coupon interest. Interest expense related to the 2021 Notes for the nine months ended September 30, 2018 was $21.3 million, which is comprised of approximately $14.4 million related to the amortization of debt discount and debt issuance costs and $6.9 million for the contractual coupon interest. The effective interest rate on the liability component of the 2021 Notes for the three and nine months ended September 30, 2018 is 7.44%. Accrued interest related to the 2021 Notes as of September 30, 2018 and December 31, 2017 was $3.1 million and $0.8 million, respectively, and is recorded in accrued expenses and other current liabilities in the condensed consolidated balance sheet.

The following table presents the outstanding principal amount and carrying value of the 2021 Notes as of the dates presented (in thousands):

	Outstanding Principal Amount		Unamortized Debt Discount and Debt Issuance Costs			Carrying Value
September 30, 2018	$	460,000	$	(70,332	)	$	389,668
December 31, 2017	$	460,000	$	(84,721	)	$	375,279

As of September 30, 2018, the unamortized debt discount and debt issuance costs for the 2021 Notes will be amortized to interest expense over a remaining period of approximately 38 months.

The estimated fair value of the 2021 Notes was $498.5 million and $509.0 million, respectively, as of September 30, 2018 and December 31, 2017. The estimated fair value of the 2021 Notes was determined through consideration of quoted market prices. The fair value is classified as Level 3 due to the limited trading activity for the 2021 Notes.

The Capped Call Confirmations are expected generally to reduce the potential dilution of our Class C capital stock upon any conversion of 2021 Notes and/or offset the cash payments the Company is required to make in excess of the principal amount of the 2021 Notes in the event that the market price of the Class C capital stock is greater than the strike price of the Capped Call Confirmations (which initially corresponds to the initial conversion price of the 2021 Notes and is subject to certain adjustments under the terms of the Capped Call Confirmations), with such reduction and/or offset subject to a cap based on the cap price of the Capped Call Confirmations. The Capped Call Confirmations have an initial cap price of $69.19 per share, which represents a premium of approximately 85% over the closing price of the Company’s Class C capital stock on The Nasdaq Global Select Market on December 6, 2016, and is subject to certain adjustments under the terms of the Capped Call Confirmations. The Capped Call Confirmations will cover, subject to anti-dilution adjustments substantially similar to those applicable to the 2021 Notes, the number of shares of Class C capital stock that will underlie the 2021 Notes. In addition, the Capped Call Confirmations provide for the Company to elect, subject to certain conditions, for the Capped Call Confirmations to remain outstanding (with certain modifications) following its election to redeem the 2021 Notes, notwithstanding any conversions of 2021 Notes in connection with such redemption. The Capped Call Confirmations do not meet the criteria for separate accounting as a derivative as they are indexed to our own stock. The premiums paid for the Capped Call Confirmations have been included as a net reduction to additional paid-in capital within shareholders’ equity.

Trulia’s Convertible Senior Notes due in 2020

In connection with the February 2015 acquisition of Trulia, a portion of the total purchase price was allocated to Trulia’s Convertible Senior Notes due in 2020 (the “2020 Notes”), which are unsecured senior obligations. Pursuant to and in accordance with the Merger Agreement, Zillow Group entered into a supplemental indenture in respect of the 2020 Notes in the aggregate principal amount of $230.0 million, which supplemental indenture provides, among other things, that, at the effective time of the Trulia Merger, (i) each outstanding 2020 Note is no longer convertible into shares of Trulia common stock and is convertible solely into shares of Zillow Group Class A common stock, pursuant to, and in accordance with, the terms of the indenture governing the 2020 Notes, and (ii) Zillow Group guaranteed all of the obligations of Trulia under the 2020 Notes and related indenture. In December 2016, the Company used approximately $370.2 million of the net proceeds from the issuance of the 2021 Notes discussed above to repurchase $219.9 million aggregate principal of the 2020 Notes in privately negotiated transactions. The aggregate principal amount of the 2020 Notes is due on December 15, 2020 if not earlier converted or redeemed. Interest is payable on the 2020 Notes at the rate of 2.75% semi-annually on June 15 and December 15 of each year.

Holders of the 2020 Notes may convert all or any portion of their notes, in multiples of $1,000 principal amount, at their option at any time prior to the close of business on the business day immediately preceding the maturity date. Regarding the supplemental indenture in respect of the 2020 Notes, the conversion ratio immediately prior to the effective time of the Trulia Merger of 27.8303 shares of Trulia common stock per $1,000 principal amount of notes was adjusted to 12.3567 shares of our Class A common stock per $1,000 principal amount of notes based on the exchange ratio of 0.444 per the Merger Agreement. This was equivalent to an initial conversion price of approximately $80.93 per share of our Class A common stock. Regarding the August 2015 distribution of shares of our Class C capital stock as a dividend to our Class A and Class B common shareholders, the conversion ratio has been further adjusted to 41.4550 shares of Class A common stock per $1,000 principal amount of notes, which is equivalent to a conversion price of approximately $24.12 per share of our Class A common stock. The conversion ratio will be adjusted for certain dilutive events and will be increased in the case of corporate events that constitute a “Make-Whole Fundamental Change” (as defined in the indenture governing the notes). The conversion option of the 2020 Notes has no cash settlement provisions. The conversion option does not meet the criteria for separate accounting as a derivative as it is indexed to our own stock.

The holders of the 2020 Notes will have the ability to require us to repurchase the notes in whole or in part upon the occurrence of an event that constitutes a “Fundamental Change” (as defined in the indenture governing the notes, including such events as a “change in control” or “termination of trading”, subject to certain exceptions). In such case, the repurchase price would be 100% of the principal amount of the 2020 Notes plus accrued and unpaid interest, if any, to, but excluding, the Fundamental Change repurchase date. Certain events are also considered “Events of Default,” which may result in the acceleration of the maturity of the 2020 Notes, as described in the indenture governing the notes. There are no financial covenants associated with the 2020 Notes.

The 2020 Notes are redeemable, at our option, in whole or in part on or after December 20, 2018, if the last reported sale price per share of our Class A common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period.

The carrying value of the 2020 Notes was $9.6 million and $10.1 million, respectively, as of September 30, 2018 and December 31, 2017. The estimated fair value of the 2020 Notes was $16.7 million and $17.6 million, respectively, as of September 30, 2018 and December 31, 2017. The estimated fair value of the 2020 Notes was determined through consideration of quoted market prices. The fair value is classified as Level 3 due to the limited trading activity for the 2020 Notes.

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Income Taxes

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

We are subject to federal and state income taxes in the United States and in Canada. As of September 30, 2018 and December 31, 2017, 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 $1,014.0 million as of December 31, 2017, which are available to reduce future taxable income. We have accumulated state tax losses of approximately $21.4 million (tax effected) as of December 31, 2017.

We recorded an income tax benefit of $14.7 million for the three months ended September 30, 2018, which was calculated as the difference between the income tax benefit of $22.7 million recorded for the nine months ended September 30, 2018 and the income tax benefit of $8.0 million recorded for the six months ended June 30, 2018. The $22.7 million tax benefit recorded for the nine months ended September 30, 2018 is comprised of a $1.9 million income tax benefit, which was calculated using an estimate of our annual effective tax rate of 4.3% applied to our loss before income taxes of $44.9 million for the nine months ended September 30, 2018 and a $20.8 million discrete income tax benefit as a result of the treatment of stock compensation windfall deductions and the impact from the Tax Act related to IRC Section 162(m). Our estimated annual effective tax rate for the nine months ended September 30, 2018 is primarily impacted by the release in valuation allowance resulting from indefinite-lived deferred tax assets and their ability to offset indefinite-lived intangible deferred tax liabilities.

As of September 30, 2018, we have completed our accounting for the income tax effects related to the deduction limitations on compensation under the Tax Act and have recorded a discrete tax benefit adjustment of $3.3 million during the three months ended September 30, 2018. The Internal Revenue Service has provided further guidance in applying the written binding contracts requirement under the Tax Act and certain of our executive compensation previously eligible to be deducted for tax purposes under Section 162(m) of the Internal Revenue Code will be considered grandfathered and, therefore, will continue to be deductible. Based on the clarification of these rules, the accounting related to the Section 162(m) limitation of the Internal Revenue Code is considered complete and we have recorded a $5.9 million discrete tax benefit adjustment related to this item for the nine months ended September 30, 2018.

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Shareholders' Equity

9 Months Ended

Sep. 30, 2018

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 September 30, 2018 or December 31, 2017.

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. During the nine months ended September 30, 2018 and the year ended December 31, 2017, no shares of Class B common stock were converted into Class A common stock at the option of the holders. 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. On July 3, 2018, Zillow Group issued and sold 6,557,017 shares (of which 855,263 shares were related to the exercise of the underwriters’ option to purchase additional shares) of our Class C capital stock at a public offering price of $57.00 per share. We received net proceeds of $360.3 million after deducting underwriting discounts and commissions and offering expenses payable by us.

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Share-Based Awards

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Awards

Share-Based Awards

In connection with our February 2015 acquisition of Trulia, we assumed the obligations of Zillow and Trulia outstanding under pre-existing stock plans. We intend that future equity grants will be made under Zillow Group’s 2011 Amended and Restated Incentive Plan (as amended and/or restated from time to time, the “2011 Plan”) only (or a successor thereto).

Zillow Group, Inc. Amended and Restated 2011 Incentive Plan

On July 19, 2011, the 2011 Plan became effective. In addition to the share reserve of 18,400,000 shares, the number of shares available for issuance under the 2011 Plan automatically increases on the first day of each of our fiscal years by a number of shares equal to the least of (a) 3.5% of our outstanding Class A common stock, Class B common stock, and Class C capital stock on a fully diluted basis as of the end of our immediately preceding fiscal year, (b) 10,500,000 shares, and (c) a lesser amount determined by our board of directors; provided, however, that any shares from any increases in previous years that are not actually issued will continue to be available for issuance under the 2011 Plan. In addition, shares previously available for grant under Zillow, Inc.’s 2005 Equity Incentive Plan (the “2005 Plan”), but not issued or subject to outstanding awards under the 2005 Plan as of July 19, 2011, and shares subject to outstanding awards under the 2005 Plan that subsequently cease to be subject to such awards (other than by reason of exercise of the awards) are available for grant under the 2011 Plan. The 2011 Plan is administered by the compensation committee of the board of directors. Under the terms of the 2011 Plan, the compensation committee may grant equity awards, including incentive stock options, nonqualified stock options, restricted stock, restricted stock units or restricted units to employees, officers, directors, consultants, agents, advisers and independent contractors. The board of directors has also authorized certain senior executive officers to grant equity awards under the 2011 Plan, within limits prescribed by our board of directors. The 2011 Plan provides that in the event of a stock dividend, stock split or similar event, the maximum number and kind of securities available for issuance under the plan will be proportionally adjusted.

Options under the 2011 Plan are granted with an exercise price per share not less than 100% of the fair market value of our stock on the date of grant, with the exception of substituted option awards granted in connection with acquisitions, and are exercisable at such times and under such conditions as determined by the compensation committee. Any portion of an option that is not vested and exercisable on the date of a participant’s termination of service expires on such date. Employees generally forfeit their rights to exercise vested options 3 months following their termination of employment or 12 months following termination by reason of death, disability or retirement. Options granted under the 2011 Plan typically expire seven or ten years from the grant date and typically vest either 25% after 12 months and ratably thereafter over the next 36 months or quarterly over a period of four years, though certain options have been granted with alternative vesting schedules.

Restricted stock units granted under the 2011 Plan typically vest either 25% after 12 months and quarterly thereafter over the next three years, quarterly over a period of four years, or 12.5% after 6 months and quarterly thereafter for the next 3.5 years. Any portion of a restricted stock unit that is not vested on the date of a participant’s termination of service expires on such date.

Option Awards

The following table summarizes option award activity for the nine months ended September 30, 2018:

	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, 2018	26,645,206		$	27.70	5.72	$	355,739
Granted	5,429,505		53.63
Exercised	(5,177,060	)	22.14
Forfeited or cancelled	(610,688	)	34.55
Outstanding at September 30, 2018	26,286,963		33.99		6.24	321,371
Vested and exercisable at September 30, 2018	14,128,452		29.07		4.76	220,974

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 September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
Expected volatility	42%	46%	42%-45%	46%-49%
Expected dividend yield	—	—	—	—
Risk-free interest rate	2.84%	1.70%	2.52%-2.84%	1.67%-1.84%
Weighted-average expected life	4.50 years	4.25 years	4.50-5.00 years	4.25-4.75 years
Weighted-average fair value of options granted	$19.21	$15.79	$20.89	$14.40

As of September 30, 2018, there was a total of $179.9 million in unrecognized compensation cost related to unvested stock options.

Restricted Stock Units

The following table summarizes activity for restricted stock units for the nine months ended September 30, 2018:

	Restricted Stock Units		Weighted- Average Grant- Date Fair Value
Unvested outstanding at January 1, 2018	4,016,405		$	33.22
Granted	2,898,786		52.75
Vested	(1,288,746	)	35.07
Forfeited or cancelled	(524,952	)	38.50
Unvested outstanding at September 30, 2018	5,101,493		43.33

The fair value of outstanding restricted stock units will be recorded as share-based compensation expense over the vesting period. As of September 30, 2018, there was $205.9 million of total unrecognized compensation cost related to unvested restricted stock units.

Share-Based Compensation Expense

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Cost of revenue	$	969	$	1,014	$	3,180	$	2,942
Sales and marketing	5,911		5,914		17,413		17,694
Technology and development	15,031		10,438		40,920		29,329
General and administrative	19,771		11,208		49,853		34,197
Total	$	41,682	$	28,574	$	111,366	$	84,162

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Net Income (Loss) Per Share

9 Months Ended

Sep. 30, 2018

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 2020 Notes using the if-converted method.

Since the Company expects to settle the principal amount of the outstanding 2021 Notes and 2023 Notes in cash, the Company uses the treasury stock method for calculating any potential dilutive effect of the conversion spread on diluted net income per share, if applicable. For the 2021 Notes, the conversion spread of approximately 8.8 million shares has a dilutive impact on diluted net income per share when the market price of the Company’s Class C capital stock at the end of a period exceeds the conversion price of $52.36 per share. For the 2023 Notes, the conversion spread of approximately 4.8 million shares has a dilutive impact on diluted net income per share when the market price of the Company’s Class C capital stock at the end of a period exceeds the conversion price of $78.37 per share.

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 September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
Denominator for basic calculation	202,416	187,692	195,208	185,447
Effect of dilutive securities:
Option awards	—	7,401	—	—
Unvested restricted stock units	—	1,332	—	—
Denominator for dilutive calculation	202,416	196,425	195,208	185,447

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 September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
Weighted-average Class A common stock and Class C capital stock option awards outstanding	21,766	6,542	23,508	28,671
Weighted-average Class A common stock and Class C capital stock restricted stock units outstanding	5,072	199	4,891	4,311
Class A common stock issuable upon conversion of the 2020 Notes	410	438	410	438
Total Class A common stock and Class C capital stock equivalents	27,248	7,179	28,809	33,420

In the event of liquidation, dissolution, distribution of assets or winding-up of the Company, the holders of all classes of common and capital stock have equal rights to receive all the assets of the Company after the rights of the holders of preferred stock have been satisfied. We have not presented net income (loss) per share under the two-class method for our Class A common stock, Class B common stock and Class C capital stock because it would be the same for each class due to equal dividend and liquidation rights for each class.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

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 2018 and 2024. We are committed to pay a portion of the related operating expenses under certain of these lease agreements. Certain of these arrangements have free rent periods or escalating rent payment provisions, and we recognize rent expense under such arrangements on a straight-line basis. Operating lease expense for the three months ended September 30, 2018 and 2017 was $5.8 million and $5.7 million, respectively. Operating lease expense for the nine months ended September 30, 2018 and 2017 was $17.2 million and $15.8 million, respectively.

Purchase Commitments

Purchase commitments primarily include various non-cancelable agreements to purchase content related to our mobile applications and websites as well as homes that the Company is under contract to purchase through Zillow Offers but that have not closed as of the respective date. As of September 30, 2018, the value of homes under contract that not have closed was $30.3 million.

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 $3.5 million and $3.7 million, respectively, as of September 30, 2018 and December 31, 2017.

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.

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. A federal jury trial began on January 23, 2017, and on February 9, 2017, the jury 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. In March 2017, the Company filed motions in the district court seeking judgment for the Company on certain claims that are the subject of the verdict, and for a new trial on others. On June 20, 2017, the judge ruled and granted in part our 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 October 26, 2017, the Company 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 oral hearing for the appeal took place on August 28, 2018. We have recorded an estimated liability for approximately $4.1 million as of September 30, 2018 and December 31, 2017. We do not believe there is a reasonable possibility that a material loss in excess of amounts accrued may be incurred.

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 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 May 2018, the plaintiffs filed their opposition to our motion to dismiss the consolidated amended complaint. In June 2018, we filed our reply in support of our motion to dismiss the consolidated amended complaint. In October 2018, our motion to dismiss was granted, though the plaintiffs have 45 days to attempt to cure the defects in their consolidated amended complaint. We have denied the allegations of wrongdoing and intend to vigorously defend the claims in this lawsuit. We have not recorded an accrual related to this lawsuit as of September 30, 2018 and December 31, 2017, as we do not believe a loss is probable.

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, 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, the defendants breached their fiduciary duties in connection with oversight of 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. All four of the shareholder derivative lawsuits have been stayed until after final resolution of pleading motions and related appeals, if any, in the consolidated securities class action lawsuit discussed above. The defendants intend to deny the allegations of wrongdoing and vigorously defend the claims in these lawsuits. We have not recorded an accrual related to these lawsuits as of September 30, 2018 and December 31, 2017, as we do not believe a loss is probable.

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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Self-Insurance	9 Months Ended
	Sep. 30, 2018
Insurance [Abstract]
Self-Insurance	Self-InsuranceWe are self-insured for medical benefits, and beginning on January 1, 2018 for dental benefits, for all qualifying Zillow Group employees. The medical plan carries a stop-loss policy which will protect when cumulative medical claims exceed 125% of expected claims for the plan year with a limit of $1.0 million and from individual claims during the plan year exceeding $150,000. We record estimates of the total costs of claims incurred based on an analysis of historical data and independent estimates. Our liability for self-insured claims is included within accrued compensation and benefits in our condensed consolidated balance sheets and was $3.0 million and $2.0 million, respectively, as of September 30, 2018 and December 31, 2017.

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Employee Benefit Plan	9 Months Ended
	Sep. 30, 2018
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 for the three months ended September 30, 2018 and 2017 was $4.1 million and $3.0 million, respectively. The total expense related to the Zillow Group 401(k) Plan for the nine months ended September 30, 2018 and 2017 was $11.9 million and $8.9 million, respectively.

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Segment Information and Revenue

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Segment Information and Revenue

Segment Information and Revenue

Beginning in the second quarter of 2018, we have two 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 of the Internet, Media & Technology (“IMT”) and Homes segments.

The IMT segment includes the financial results for the Premier Agent, Rentals, Mortgages 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 Homes segment includes the financial results from Zillow Group’s buying and selling of homes directly.

Revenue and costs are generally directly attributed to our segments. However, due to the integrated structure of our business, certain costs incurred by one segment may benefit the other segment. These costs are generally headcount-related and are allocated to each segment based on the estimated effort attributable to each segment.

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

	Three Months Ended September 30, 2018									Nine Months Ended September 30, 2018
	IMT			Homes			Consolidated			IMT			Homes			Consolidated
Revenue:
Premier Agent	$	232,703		$	—		$	232,703		$	677,320		$	—		$	677,320
Rentals	37,319			—			37,319			99,670			—			99,670
Mortgages	18,438			—			18,438			56,766			—			56,766
Other	43,616			—			43,616			123,445			—			123,445
Homes	—			11,018			11,018			—			11,018			11,018
Total revenue	332,076			11,018			343,094			957,201			11,018			968,219
Costs and expenses:
Cost of revenue	26,386			10,286			36,672			75,832			10,286			86,118
Sales and marketing	123,755			4,979			128,734			405,525			8,227			413,752
Technology and development	99,570			5,744			105,314			286,983			12,640			299,623
General and administrative	65,156			5,587			70,743			172,756			14,639			187,395
Impairment costs	10,000			—			10,000			10,000			—			10,000
Acquisition-related costs	1,405			—			1,405			2,064			—			2,064
Integration costs	523			—			523			523			—			523
Total costs and expenses	326,795			26,596			353,391			953,683			45,792			999,475
Income (loss) from operations	5,281			(15,578		)	(10,297		)	3,518			(34,774		)	(31,256		)
Other income	7,773			—			7,773			13,308			—			13,308
Interest expense	(12,236		)	(432		)	(12,668		)	(26,496		)	(432		)	(26,928		)
Income (loss) before income taxes	$	818		$	(16,010	)	$	(15,192	)	$	(9,670	)	$	(35,206	)	$	(44,876	)

We have not presented the comparable 2017 periods in the table above because we had one operating and reportable segment prior to 2018.

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Subsequent Events

9 Months Ended

Sep. 30, 2018

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

Acquisition of Mortgage Lenders of America

On October 31, 2018, Zillow Group’s wholly owned subsidiary, ZGM Holdco, Inc., acquired Mortgage Lenders of America, L.L.C. (“MLOA”), a national mortgage lender headquartered in Overland Park, Kansas for approximately $65.0 million in cash, subject to certain adjustments. The purchase price will be allocated to the assets acquired and liabilities assumed, including identifiable intangible assets, based on their respective fair values at the acquisition date. We are currently performing the procedures necessary to determine the purchase price allocation and will record estimated fair values during the fourth quarter of 2018.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2018

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, 2017, which was filed with the SEC on February 15, 2018. The condensed consolidated balance sheet as of December 31, 2017, 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 September 30, 2018, our results of operations and comprehensive income (loss) for the three and nine month periods ended September 30, 2018 and 2017, and our cash flows for the nine month periods ended September 30, 2018 and 2017. The results of the three and nine month periods ended September 30, 2018 are not necessarily indicative of the results to be expected for the year ending December 31, 2018 or for any interim period or for any other future year.

Use of Estimates

Use of EstimatesThe 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 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 with definite lives, share-based compensation, income taxes, business combinations, and the recoverability of goodwill and indefinite-lived intangible assets, among others. To the extent there are material differences between these estimates, judgments, or assumptions and actual results, our financial statements will be affected.

Recently Adopted Accounting Standards

Recently Adopted Accounting Standards

In May 2014, the Financial Accounting Standards Board (“FASB”) issued guidance on revenue from contracts with customers. The guidance states that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those products or services. It also states that an entity should recognize as an asset the incremental costs of obtaining a contract that the entity expects to recover and amortize the costs consistent with the transfer to the customer of the products or services to which the asset relates. The guidance requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. We adopted this guidance effective January 1, 2018 using the modified retrospective transition approach applied to all contracts at the date of initial application. We recorded an adjustment of $40.3 million to decrease accumulated deficit as of January 1, 2018 related to the accounting for the cost of sales commissions, primarily related to sales commissions for our Premier Agent and Premier Broker advertising products. Historically, we expensed these sales commission costs as incurred, but under the new guidance, the cost of certain sales commissions is recorded as a contract cost asset and recognized as an operating expense over the period that we expect to recover the costs.

The amount by which each financial statement line item is affected by the application of this guidance for the three months ended September 30, 2018 is as follows (in thousands, except per share data):

	New Guidance			Prior Guidance			Change
Condensed Consolidated Statement of Operations:
Sales and marketing	$	128,734		$	130,588		$	(1,854	)
Total costs and expenses	353,391			355,245			(1,854		)
Loss from operations	(10,297		)	(12,151		)	1,854
Loss before income taxes	(15,192		)	(17,046		)	1,854
Income tax benefit	14,700			14,992			(292		)
Net loss	(492		)	(2,054		)	1,562
Net loss per share — basic and diluted	—			(0.01		)	0.01

The amount by which each financial statement line item is affected by the application of this guidance as of and for the nine months ended September 30, 2018 is as follows (in thousands, except per share data):

	New Guidance			Prior Guidance			Change
Condensed Consolidated Statement of Operations:
Sales and marketing	$	413,752		$	418,668		$	(4,916	)
Total costs and expenses	999,475			1,004,391			(4,916		)
Loss from operations	(31,256		)	(36,172		)	4,916
Loss before income taxes	(44,876		)	(49,792		)	4,916
Income tax benefit	22,700			23,892			(1,192		)
Net loss	(22,176		)	(25,900		)	3,724
Net loss per share — basic and diluted	(0.11		)	(0.13		)	0.02
Condensed Consolidated Balance Sheet:
Contract cost assets	45,238			—			45,238
Total assets	4,202,457			4,157,219			45,238
Deferred tax liabilities and other long-term liabilities	21,861			20,669			1,192
Total liabilities	883,438			882,246			1,192
Accumulated deficit	(574,097		)	(619,335		)	45,238
Total shareholders’ equity	3,319,019			3,282,422			36,597
Total liabilities and shareholders’ equity	4,202,457			4,157,219			45,238

Recently Issued Accounting Standards Not Yet Adopted

In August 2018, the FASB issued guidance related to a customer’s accounting for implementation costs incurred in hosting arrangements. The guidance aligns the requirements for capitalizing implementation costs incurred in cloud computing arrangements with the requirements for capitalizing costs to develop or obtain internal-use software. This guidance is effective for interim and annual reporting periods beginning after December 15, 2019, and early adoption is permitted. This guidance may be applied either retrospectively or prospectively. We expect to adopt this guidance on January 1, 2020. We have not yet determined the impact the adoption of this guidance will have on our financial position, results of operations or cash flows.

In August 2018, the FASB issued guidance related to disclosure requirements for fair value measurements. This guidance removes, modifies and adds disclosures related to fair value measurements. This guidance is effective for interim and annual periods beginning after December 15, 2019, and early adoption is permitted. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim and annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. We expect to adopt this guidance on January 1, 2020. We have not yet determined the impact the adoption of this guidance will have on our financial statement disclosures.

In June 2018, the FASB issued guidance related to contributions received and made. This guidance assists entities with evaluating whether a transfer of assets is considered a contribution or an exchange transaction. This guidance is effective for interim and annual reporting periods beginning after June 15, 2018 for contributions received and after December 15, 2018 for contributions made, and early adoption is permitted. The guidance should be applied on a modified prospective basis, though retrospective application is permitted. We expect to adopt this guidance on January 1, 2019. The adoption of this guidance is not expected to have a material impact on our financial position, results of operations or cash flows.

In February 2018, the FASB issued guidance on income tax accounting related to the Tax Act. This guidance permits a reclassification from accumulated other comprehensive income (loss) to accumulated deficit for the adjustment of deferred taxes due to the reduction of the historical corporate income tax rate to the newly enacted corporate income tax rate under the Tax Act. It also requires certain disclosures regarding these reclassifications. The guidance is effective for interim and annual reporting periods beginning after December 15, 2018, and early adoption is permitted. This guidance must be applied either on a prospective basis in the period of adoption or retrospectively to each period in which the effect of the change in the corporate income tax rate is recognized. We expect to adopt this guidance on January 1, 2019. The adoption of this guidance is not expected to have a material impact on our financial position, results of operations or cash flows.

In March 2017, the FASB issued guidance related to the premium amortization on purchased callable debt securities. This guidance shortens the amortization period for certain callable debt securities purchased at a premium by requiring that the premium be amortized to the earliest call date. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018, and early adoption is permitted. This guidance must be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. We expect to adopt this guidance on January 1, 2019. The adoption of this guidance is not expected to have a material impact on our financial position, results of operations or cash flows.

In June 2016, the FASB issued guidance on the measurement of credit losses on financial instruments. This guidance requires the use of an expected loss impairment model for instruments measured at amortized cost. For available-for-sale debt securities, an entity is required to recognize credit losses through an allowance for credit losses rather than as a write-down. This guidance is effective for interim and annual reporting periods beginning after December 15, 2019, and early adoption is permitted for interim and annual reporting periods beginning after December 15, 2018. The adoption of this guidance requires a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. We expect to adopt this guidance on January 1, 2020. We have not yet determined the impact the adoption of this guidance will have on our financial position, results of operations or cash flows.

In February 2016, the FASB issued guidance on leases. This guidance requires the recognition of a right-of-use asset and lease liability on the balance sheet for all leases. This guidance also requires more detailed disclosures to enable users of financial statements to understand the amount, timing, and uncertainty of cash flows arising from leases. This guidance is effective for interim and annual reporting periods beginning after December 15, 2018. In July 2018, the FASB issued certain targeted improvements to the accounting and disclosure requirements for leases, including an additional optional transition method that allows entities to initially apply the new standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption without restating prior periods. We will adopt this guidance on January 1, 2019 using the optional transition method. Under this approach, we will not restate the prior financial statements presented. As we progress through our implementation of this guidance, we continue to expect a significant impact on our financial position upon adoption, primarily due to our office space operating leases, as we will be required to recognize lease assets and lease liabilities on our condensed consolidated balance sheet. As our leases do not provide an implicit rate, we plan to use our incremental borrowing rate based on information available at the commencement date to determine the present value of future payments. We continue to evaluate the incremental borrowing rate, changes to our internal control structure, accounting policies and disclosures. We continue to assess the impact the adoption will have on our results of operations and cash flows.

Fair Value Measurements

Accounting standards define fair value as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market in an orderly transaction between market participants on the measurement date. The standards also establish a fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value:

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

• Level 2—Assets and liabilities valued based on observable market data for similar instruments, such as quoted prices for similar assets or liabilities.

• Level 3—Unobservable inputs that are supported by little or no market activity; instruments valued based on the best available data, some of which is internally developed, and considers risk premiums that a market participant would require.

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. The fair value measurement of corporate notes and bonds, commercial paper, U.S. government agency securities and certificates of deposit 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.

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.

Restricted cash — Restricted cash consists of cash received from the resale of homes through Zillow Offers which is used to repay amounts borrowed on the Revolving Credit Facility (see Note 12) as well as certain reserves we are required to maintain pursuant to the Revolving Credit Facility. The carrying value of restricted cash approximates fair value due to the short period of time amounts borrowed on the Revolving Credit Facility are outstanding.

Net 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 2020 Notes using the if-converted method.

Segment Reporting

Beginning in the second quarter of 2018, we have two 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 of the Internet, Media & Technology (“IMT”) and Homes segments.

The IMT segment includes the financial results for the Premier Agent, Rentals, Mortgages 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 Homes segment includes the financial results from Zillow Group’s buying and selling of homes directly.

Revenue and costs are generally directly attributed to our segments. However, due to the integrated structure of our business, certain costs incurred by one segment may benefit the other segment. These costs are generally headcount-related and are allocated to each segment based on the estimated effort attributable to each segment.

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

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Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Schedule of Effect of Application of New Guidance

The amount by which each financial statement line item is affected by the application of this guidance for the three months ended September 30, 2018 is as follows (in thousands, except per share data):

	New Guidance			Prior Guidance			Change
Condensed Consolidated Statement of Operations:
Sales and marketing	$	128,734		$	130,588		$	(1,854	)
Total costs and expenses	353,391			355,245			(1,854		)
Loss from operations	(10,297		)	(12,151		)	1,854
Loss before income taxes	(15,192		)	(17,046		)	1,854
Income tax benefit	14,700			14,992			(292		)
Net loss	(492		)	(2,054		)	1,562
Net loss per share — basic and diluted	—			(0.01		)	0.01

The amount by which each financial statement line item is affected by the application of this guidance as of and for the nine months ended September 30, 2018 is as follows (in thousands, except per share data):

	New Guidance			Prior Guidance			Change
Condensed Consolidated Statement of Operations:
Sales and marketing	$	413,752		$	418,668		$	(4,916	)
Total costs and expenses	999,475			1,004,391			(4,916		)
Loss from operations	(31,256		)	(36,172		)	4,916
Loss before income taxes	(44,876		)	(49,792		)	4,916
Income tax benefit	22,700			23,892			(1,192		)
Net loss	(22,176		)	(25,900		)	3,724
Net loss per share — basic and diluted	(0.11		)	(0.13		)	0.02
Condensed Consolidated Balance Sheet:
Contract cost assets	45,238			—			45,238
Total assets	4,202,457			4,157,219			45,238
Deferred tax liabilities and other long-term liabilities	21,861			20,669			1,192
Total liabilities	883,438			882,246			1,192
Accumulated deficit	(574,097		)	(619,335		)	45,238
Total shareholders’ equity	3,319,019			3,282,422			36,597
Total liabilities and shareholders’ equity	4,202,457			4,157,219			45,238

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Summary of Balances of Cash Equivalents and Investments

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

	September 30, 2018
	Total		Level 1		Level 2
Cash equivalents:
Money market funds	$	543,703	$	543,703	$	—
Commercial paper	3,490		—		3,490
Certificates of deposit	249		—		249
Short-term investments:
U.S. government agency securities	717,927		—		717,927
Corporate notes and bonds	121,875		—		121,875
Commercial paper	92,674		—		92,674
Municipal securities	43,154		—		43,154
Foreign government securities	17,905		—		17,905
Certificates of deposit	5,706		—		5,706
Total	$	1,546,683	$	543,703	$	1,002,980

	December 31, 2017
	Total		Level 1		Level 2
Cash equivalents:
Money market funds	$	233,508	$	233,508	$	—
Corporate notes and bonds	6,199		—		6,199
Commercial paper	3,987		—		3,987
U.S. government agency securities	1,748		—		1,748
Certificates of deposit	249		—		249
Short-term investments:
U.S. government agency securities	298,758		—		298,758
Corporate notes and bonds	44,607		—		44,607
Commercial paper	39,325		—		39,325
Municipal securities	11,459		—		11,459
Certificates of deposit	10,297		—		10,297
Foreign government securities	5,998		—		5,998
Total	$	656,135	$	233,508	$	422,627

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

9 Months Ended

Sep. 30, 2018

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, available-for-sale investments and restricted cash as of the dates presented (in thousands):

	September 30, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	96,350	$	—	$	—		$	96,350
Cash equivalents:
Money market funds	543,703		—		—			543,703
Commercial paper	3,490		—		—			3,490
Certificates of deposit	249		—		—			249
Short-term investments:
U.S. government agency securities	719,380		—		(1,453		)	717,927
Corporate notes and bonds	121,987		1		(113		)	121,875
Commercial paper	92,674		—		—			92,674
Municipal securities	43,237		—		(83		)	43,154
Foreign government securities	17,940		—		(35		)	17,905
Certificates of deposit	5,706		1		(1		)	5,706
Restricted cash	3,203		—		—			3,203
Total	$	1,647,919	$	2	$	(1,685	)	$	1,646,236

	December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Market Value
Cash	$	106,404	$	—	$	—		$	106,404
Cash equivalents:
Money market funds	233,508		—		—			233,508
Corporate notes and bonds	6,200		—		(1		)	6,199
Commercial paper	3,987		—		—			3,987
U.S. government agency securities	1,748		—		—			1,748
Certificates of deposit	249		—		—			249
Short-term investments:
U.S. government agency securities	299,814		—		(1,056		)	298,758
Corporate notes and bonds	44,661		1		(55		)	44,607
Commercial paper	39,325		—		—			39,325
Municipal securities	11,494		—		(35		)	11,459
Certificates of deposit	10,296		2		(1		)	10,297
Foreign government securities	6,000		—		(2		)	5,998
Total	$	763,686	$	3	$	(1,150	)	$	762,539

Available-for-Sale Investments by Contractual Maturity

The following table presents available-for-sale investments by contractual maturity date as of September 30, 2018 (in thousands):

	Amortized Cost		Estimated Fair Market Value
Due in one year or less	$	846,217	$	844,993
Due after one year through two years	154,707		154,248
Total	$	1,000,924	$	999,241

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Accounts Receivable, net (Tables)

9 Months Ended

Sep. 30, 2018

Receivables [Abstract]

Schedule of Accounts Receivable, Net

The following table presents the changes in the allowance for doubtful accounts (in thousands):

Balance as of January 1, 2018	$	5,341
Bad debt expense	1,053
Less: write-offs, net of recoveries and other adjustments	(1,118		)
Balance as of September 30, 2018	$	5,276

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Inventory (Tables)

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Components of Net Inventory

The components of inventory, net of applicable lower of cost or net realizable value write-downs, were as follows (in thousands):

	September 30, 2018		December 31, 2017
Work-in-progress	$	16,010	$	—
Finished goods	27,247		—
Inventory	$	43,257	$	—

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Property and Equipment, net (Tables)

9 Months Ended

Sep. 30, 2018

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):

	September 30, 2018			December 31, 2017
Website development costs	$	147,416		$	130,072
Leasehold improvements	58,354			47,321
Computer equipment	30,896			30,071
Construction-in-progress	26,150			28,150
Office equipment, furniture and fixtures	26,221			22,887
Property and equipment	289,037			258,501
Less: accumulated amortization and depreciation	(164,756		)	(146,230		)
Property and equipment, net	$	124,281		$	112,271

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Intangible Assets, net (Tables)

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

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

	September 30, 2018
	Cost		Accumulated Amortization			Net
Purchased content	$	39,105	$	(27,978	)	$	11,127
Software	21,893		(12,534		)	9,359
Customer relationships	103,900		(57,304		)	46,596
Developed technology	111,980		(69,137		)	42,843
Trade names and trademarks	4,900		(4,658		)	242
Intangibles-in-progress	3,720		—			3,720
Total	$	285,498	$	(171,611	)	$	113,887

	December 31, 2017
	Cost		Accumulated Amortization			Net
Purchased content	$	35,260	$	(20,480	)	$	14,780
Software	18,957		(8,899		)	10,058
Customer relationships	103,900		(46,365		)	57,535
Developed technology	113,380		(56,664		)	56,716
Trade names and trademarks	4,900		(3,943		)	957
Advertising relationships	9,000		(8,525		)	475
Intangibles-in-progress	2,190		—			2,190
Total	$	287,587	$	(144,876	)	$	142,711

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Deferred Revenue (Tables)

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Schedule of Change in Deferred Revenue

The following tables present the changes in deferred revenue for the periods presented (in thousands):

	Three Months Ended September 30, 2018
Balance as of July 1, 2018	$	35,920
Deferral of revenue	253,571
Less: Revenue recognized	(253,532		)
Balance as of September 30, 2018	$	35,959

	Nine Months Ended September 30, 2018
Balance as of January 1, 2018	$	31,918
Deferral of revenue	742,427
Less: Revenue recognized	(738,386		)
Balance as of September 30, 2018	$	35,959

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Debt (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Outstanding Principal Amount and Carrying Value

The following table presents the outstanding principal amount and carrying value of the 2021 Notes as of the dates presented (in thousands):

	Outstanding Principal Amount		Unamortized Debt Discount and Debt Issuance Costs			Carrying Value
September 30, 2018	$	460,000	$	(70,332	)	$	389,668
December 31, 2017	$	460,000	$	(84,721	)	$	375,279

The following table presents the outstanding principal amount and carrying value of the 2023 Notes as of the date presented (in thousands):

	Outstanding Principal Amount		Unamortized Debt Discount and Debt Issuance Costs			Carrying Value
September 30, 2018	$	373,750	$	(82,717	)	$	291,033

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Share-Based Awards (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Option Award Activity

The following table summarizes option award activity for the nine months ended September 30, 2018:

	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, 2018	26,645,206		$	27.70	5.72	$	355,739
Granted	5,429,505		53.63
Exercised	(5,177,060	)	22.14
Forfeited or cancelled	(610,688	)	34.55
Outstanding at September 30, 2018	26,286,963		33.99		6.24	321,371
Vested and exercisable at September 30, 2018	14,128,452		29.07		4.76	220,974

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 September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
Expected volatility	42%	46%	42%-45%	46%-49%
Expected dividend yield	—	—	—	—
Risk-free interest rate	2.84%	1.70%	2.52%-2.84%	1.67%-1.84%
Weighted-average expected life	4.50 years	4.25 years	4.50-5.00 years	4.25-4.75 years
Weighted-average fair value of options granted	$19.21	$15.79	$20.89	$14.40

Summary of Restricted Stock Units Activity

The following table summarizes activity for restricted stock units for the nine months ended September 30, 2018:

	Restricted Stock Units		Weighted- Average Grant- Date Fair Value
Unvested outstanding at January 1, 2018	4,016,405		$	33.22
Granted	2,898,786		52.75
Vested	(1,288,746	)	35.07
Forfeited or cancelled	(524,952	)	38.50
Unvested outstanding at September 30, 2018	5,101,493		43.33

Effects of Share Based Compensation in Consolidated Statements of Operations

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Cost of revenue	$	969	$	1,014	$	3,180	$	2,942
Sales and marketing	5,911		5,914		17,413		17,694
Technology and development	15,031		10,438		40,920		29,329
General and administrative	19,771		11,208		49,853		34,197
Total	$	41,682	$	28,574	$	111,366	$	84,162

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Net Income (Loss) Per Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Reconciliation of Denominator Used In Basic and Diluted Earnings Per Share Calculations

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 September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
Denominator for basic calculation	202,416	187,692	195,208	185,447
Effect of dilutive securities:
Option awards	—	7,401	—	—
Unvested restricted stock units	—	1,332	—	—
Denominator for dilutive calculation	202,416	196,425	195,208	185,447

Antidilutive Securities Excluded from Computation of Earnings Per Share

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 September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
Weighted-average Class A common stock and Class C capital stock option awards outstanding	21,766	6,542	23,508	28,671
Weighted-average Class A common stock and Class C capital stock restricted stock units outstanding	5,072	199	4,891	4,311
Class A common stock issuable upon conversion of the 2020 Notes	410	438	410	438
Total Class A common stock and Class C capital stock equivalents	27,248	7,179	28,809	33,420

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Segment Information and Revenue (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Revenue Categories

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

	Three Months Ended September 30, 2018									Nine Months Ended September 30, 2018
	IMT			Homes			Consolidated			IMT			Homes			Consolidated
Revenue:
Premier Agent	$	232,703		$	—		$	232,703		$	677,320		$	—		$	677,320
Rentals	37,319			—			37,319			99,670			—			99,670
Mortgages	18,438			—			18,438			56,766			—			56,766
Other	43,616			—			43,616			123,445			—			123,445
Homes	—			11,018			11,018			—			11,018			11,018
Total revenue	332,076			11,018			343,094			957,201			11,018			968,219
Costs and expenses:
Cost of revenue	26,386			10,286			36,672			75,832			10,286			86,118
Sales and marketing	123,755			4,979			128,734			405,525			8,227			413,752
Technology and development	99,570			5,744			105,314			286,983			12,640			299,623
General and administrative	65,156			5,587			70,743			172,756			14,639			187,395
Impairment costs	10,000			—			10,000			10,000			—			10,000
Acquisition-related costs	1,405			—			1,405			2,064			—			2,064
Integration costs	523			—			523			523			—			523
Total costs and expenses	326,795			26,596			353,391			953,683			45,792			999,475
Income (loss) from operations	5,281			(15,578		)	(10,297		)	3,518			(34,774		)	(31,256		)
Other income	7,773			—			7,773			13,308			—			13,308
Interest expense	(12,236		)	(432		)	(12,668		)	(26,496		)	(432		)	(26,928		)
Income (loss) before income taxes	$	818		$	(16,010	)	$	(15,192	)	$	(9,670	)	$	(35,206	)	$	(44,876	)

We have not presented the comparable 2017 periods in the table above because we had one operating and reportable segment prior to 2018.

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Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions	Jan. 01, 2018 USD ($)
Accumulated Deficit | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Property, Plant and Equipment [Line Items]
Cumulative-effect adjustment	$ 40.3

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Summary of Significant Accounting Policies - Schedule of Application of Guidance (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Statement [Abstract]
Sales and marketing	$ 128,734	$ 107,108		$ 413,752	$ 344,266
Total costs and expenses	353,391	267,093		999,475	795,112
Loss from operations	(10,297)	14,746		(31,256)	(648)
Loss before income taxes	(15,192)	9,247		(44,876)	(17,204)
Income tax benefit (expense)	14,700	(41)	$ 8,000	22,700	(41)
Net income (loss)	$ (492)	$ 9,206		$ (22,176)	$ (17,245)
Net loss per share - basic and diluted (usd per share)	$ 0	$ 0.05		$ (0.11)	$ (0.09)
Statement of Financial Position [Abstract]
Contract cost assets	$ 45,238			$ 45,238		$ 0
Total assets	4,202,457			4,202,457		3,230,517
Deferred tax liabilities and other long-term liabilities	21,861			21,861		44,561
Total liabilities	883,438			883,438		569,694
Accumulated deficit	(574,097)			(574,097)		(592,243)
Total shareholders’ equity	3,319,019			3,319,019		2,660,823
Total liabilities and shareholders’ equity	4,202,457			4,202,457		$ 3,230,517
Calculated under Revenue Guidance in Effect before Topic 606
Income Statement [Abstract]
Sales and marketing	130,588			418,668
Total costs and expenses	355,245			1,004,391
Loss from operations	(12,151)			(36,172)
Loss before income taxes	(17,046)			(49,792)
Income tax benefit (expense)	14,992			23,892
Net income (loss)	$ (2,054)			$ (25,900)
Net loss per share - basic and diluted (usd per share)	$ (0.01)			$ (0.13)
Statement of Financial Position [Abstract]
Contract cost assets	$ 0			$ 0
Total assets	4,157,219			4,157,219
Deferred tax liabilities and other long-term liabilities	20,669			20,669
Total liabilities	882,246			882,246
Accumulated deficit	(619,335)			(619,335)
Total shareholders’ equity	3,282,422			3,282,422
Total liabilities and shareholders’ equity	4,157,219			4,157,219
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Income Statement [Abstract]
Sales and marketing	(1,854)			(4,916)
Total costs and expenses	(1,854)			(4,916)
Loss from operations	1,854			4,916
Loss before income taxes	1,854			4,916
Income tax benefit (expense)	(292)			(1,192)
Net income (loss)	$ 1,562			$ 3,724
Net loss per share - basic and diluted (usd per share)	$ 0.01			$ 0.02
Statement of Financial Position [Abstract]
Contract cost assets	$ 45,238			$ 45,238
Total assets	45,238			45,238
Deferred tax liabilities and other long-term liabilities	1,192			1,192
Total liabilities	1,192			1,192
Accumulated deficit	45,238			45,238
Total shareholders’ equity	36,597			36,597
Total liabilities and shareholders’ equity	$ 45,238			$ 45,238

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Fair Value Measurements - Fair Value of Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 999,241
Total	1,546,683	$ 656,135
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	543,703	233,508
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	1,002,980	422,627
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	543,703	233,508
Money market funds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	543,703	233,508
Money market funds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Corporate notes and bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		6,199
Short-term investments	121,875	44,607
Corporate notes and bonds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0
Short-term investments	0	0
Corporate notes and bonds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		6,199
Short-term investments	121,875	44,607
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	3,490	3,987
Short-term investments	92,674	39,325
Commercial paper | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Short-term investments	0	0
Commercial paper | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	3,490	3,987
Short-term investments	92,674	39,325
U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		1,748
Short-term investments	717,927	298,758
U.S. government agency securities | Level 1
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 | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		1,748
Short-term investments	717,927	298,758
Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	249	249
Short-term investments	5,706	10,297
Certificates of deposit | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Short-term investments	0	0
Certificates of deposit | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	249	249
Short-term investments	5,706	10,297
Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	43,154	11,459
Municipal securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Municipal securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	43,154	11,459
Foreign government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	17,905	5,998
Foreign government securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Foreign government securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 17,905	$ 5,998

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Fair Value Measurements - Additional Information (Detail) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value	$ 0	$ 0
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	$ 0	$ 0

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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	Sep. 30, 2018	Dec. 31, 2017
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	$ 643,792	$ 352,095
Short-term investments:
Amortized Cost	1,000,924
Gross Unrealized Gains	2	3
Gross Unrealized Losses	(1,685)
Estimated Fair Market Value	999,241
Restricted cash	3,203
Cash, cash equivalents, short-term investments, and restricted cash, amortized cost	1,647,919	763,686
Cash, cash equivalents, short-term investments, and restricted cash, gross unrealized losses		(1,150)
Cash, cash equivalents, short-term investments, and restricted cash, estimated fair market value	1,646,236	762,539
U.S. government agency securities
Short-term investments:
Amortized Cost	719,380	299,814
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,453)	(1,056)
Estimated Fair Market Value	717,927	298,758
Corporate notes and bonds
Short-term investments:
Amortized Cost	121,987	44,661
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(113)	(55)
Estimated Fair Market Value	121,875	44,607
Commercial paper
Short-term investments:
Amortized Cost	92,674	39,325
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Market Value	92,674	39,325
Municipal securities
Short-term investments:
Amortized Cost	43,237	11,494
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(83)	(35)
Estimated Fair Market Value	43,154	11,459
Foreign government securities
Short-term investments:
Amortized Cost	17,940	6,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(35)	(2)
Estimated Fair Market Value	17,905	5,998
Certificates of deposit
Short-term investments:
Amortized Cost	5,706	10,296
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(1)	(1)
Estimated Fair Market Value	5,706	10,297
Cash
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	96,350	106,404
Money market funds
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	543,703	233,508
Corporate notes and bonds
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents, at cost		6,200
Cash and cash equivalents, gross unrealized losses		(1)
Cash and cash equivalents		6,199
Commercial paper
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	3,490	3,987
U.S. government agency securities
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents		1,748
Certificates of deposit
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	$ 249	$ 249

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Cash and Cash Equivalents, Short-term Investments and Restricted Cash - Available-for-Sale Investments by Contractual Maturity (Detail) $ in Thousands	Sep. 30, 2018 USD ($)
Cash and Cash Equivalents [Abstract]
Amortized Cost, Due in one year or less	$ 846,217
Amortized Cost, Due after one year through two years	154,707
Amortized Cost	1,000,924
Estimated Fair Market Value, Due in one year or less	844,993
Estimated Fair Market Value, Due after one year through two years	154,248
Total	$ 999,241

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Accounts Receivable, net (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Receivables [Abstract]
Accounts receivable, net	$ 66,337		$ 54,396
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning balance	5,341
Bad debt expense	1,053	$ 5,861
Less: write-offs, net of recoveries and other adjustments	(1,118)
Ending balance	$ 5,276

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Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Work-in-progress	$ 16,010	$ 0
Finished goods	27,247	0
Inventory	$ 43,257	$ 0

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Contract Cost Assets (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Contract cost assets	$ 45,238,000	$ 45,238,000		$ 0
Impairment of contract cost assets	0	0
Amortization of contract cost assets	$ 8,900,000	$ 27,227,000	$ 0

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Property and Equipment, net - Detail of Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment	$ 289,037	$ 258,501
Less: accumulated amortization and depreciation	(164,756)	(146,230)
Property and equipment, net	124,281	112,271
Website development costs
Property, Plant and Equipment [Line Items]
Property and equipment	147,416	130,072
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	58,354	47,321
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment	30,896	30,071
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property and equipment	26,150	28,150
Office equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment	$ 26,221	$ 22,887

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Property and Equipment, net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Amortization and depreciation expense related to property and equipment other than website development costs	$ 5,100	$ 3,800	$ 14,200	$ 11,500
Capitalization of website development costs	8,000	13,400	26,600	39,800
Amortization of website development costs and intangible assets included in technology and development	18,165	23,537	61,735	69,957
Technology and development
Property, Plant and Equipment [Line Items]
Amortization of website development costs and intangible assets included in technology and development	12,000	13,400	37,600	39,900
Technology and development | Software Development
Property, Plant and Equipment [Line Items]
Amortization of website development costs and intangible assets included in technology and development	$ 6,200	$ 10,100	$ 24,200	$ 30,000

XML

Equity Investments - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017
Schedule of Equity Method Investments [Line Items]
Impairment costs		$ 10,000,000	$ 0	$ 10,000,000	$ 0
June 2017 Investment
Schedule of Equity Method Investments [Line Items]
Equity investments		0.0		0.0		$ 10,000,000.0
Impairment costs		10,000,000.0
October 2016 Investment
Schedule of Equity Method Investments [Line Items]
Cumulative impairment charge		0		0
Upward adjustments		0		0
Downward adjustments		0		0
October 2016 Investment | Variable Interest Entity, Not Primary Beneficiary
Schedule of Equity Method Investments [Line Items]
Equity investments	$ 10,000,000.0
Percentage of equity interest held	10.00%
Maximum exposure to loss		$ 10,000,000.0		$ 10,000,000.0

XML

Intangible Assets, net - Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Cost	$ 285,498	$ 287,587
Accumulated Amortization	(171,611)	(144,876)
Net	113,887	142,711
Purchased content
Finite-Lived Intangible Assets [Line Items]
Cost	39,105	35,260
Accumulated Amortization	(27,978)	(20,480)
Net	11,127	14,780
Software
Finite-Lived Intangible Assets [Line Items]
Cost	21,893	18,957
Accumulated Amortization	(12,534)	(8,899)
Net	9,359	10,058
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	103,900	103,900
Accumulated Amortization	(57,304)	(46,365)
Net	46,596	57,535
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	111,980	113,380
Accumulated Amortization	(69,137)	(56,664)
Net	42,843	56,716
Trade names and trademarks
Finite-Lived Intangible Assets [Line Items]
Cost	4,900	4,900
Accumulated Amortization	(4,658)	(3,943)
Net	242	957
Advertising relationships
Finite-Lived Intangible Assets [Line Items]
Cost		9,000
Accumulated Amortization		(8,525)
Net		475
Intangibles-in-progress
Finite-Lived Intangible Assets [Line Items]
Cost	3,720	2,190
Accumulated Amortization	0	0
Net	$ 3,720	$ 2,190

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Intangible Assets, net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Indefinite-lived Intangible Assets [Line Items]
Amortization of website development costs and intangible assets included in technology and development	$ 18,165	$ 23,537	$ 61,735	$ 69,957
Trade names and trademarks | Trulia
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible asset	177,000		177,000		$ 177,000
Technology and development
Indefinite-lived Intangible Assets [Line Items]
Amortization of website development costs and intangible assets included in technology and development	$ 12,000	$ 13,400	$ 37,600	$ 39,900

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Deferred Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Change in Contract with Customer, Liability [Roll Forward]
Beginning balance	$ 35,920	$ 31,918
Deferral of revenue	253,571	742,427
Less: Revenue recognized	(253,532)	(738,386)
Ending balance	35,959	35,959
Revenue recognized, recorded in deferred revenue as of prior period	$ 33,000	$ 30,600

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Debt - Narrative (Detail)				1 Months Ended		3 Months Ended		9 Months Ended
	Jul. 31, 2018 USD ($)	Jul. 03, 2018 USD ($) Days $ / shares	Dec. 12, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jan. 31, 2015	Sep. 30, 2018 USD ($) $ / shares	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Days $ / shares	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Feb. 28, 2015 USD ($)
Debt Instrument [Line Items]
Outstanding borrowings on revolving credit facility						$ 24,674,000		$ 24,674,000		$ 0
Net proceeds used to purchase capped call confirmations								29,414,000	$ 0
Interest expense						12,668,000	$ 6,906,000	26,928,000	20,526,000
Amortization of discount and issuance costs								17,990,000	$ 13,391,000
Class C Capital Stock
Debt Instrument [Line Items]
Public offering price (usd per share) | $ / shares		$ 57.00
Convertible Senior Notes due 2023, 1.50%
Debt Instrument [Line Items]
Equity component of convertible debt						78,600,000		78,600,000
Interest expense						5,000,000.0		5,000,000
Amortization of discount and issuance costs						3,600,000		3,600,000
Contractual coupon interest						$ 1,400,000		$ 1,400,000
Effective interest rate						6.99%		6.99%
Accrued interest						$ 1,400,000		$ 1,400,000
Debt instrument amortization period								57 months
Debt instrument carrying value						291,033,000		$ 291,033,000
Convertible Senior Notes due 2023, 1.50% | Fair Value, Inputs, Level 3
Debt Instrument [Line Items]
Fair value of convertible notes						$ 344,300,000		$ 344,300,000
Convertible Senior Notes due 2023, 1.50% | Class C Capital Stock
Debt Instrument [Line Items]
Conversion price (usd per share) | $ / shares						$ 78.37		$ 78.37
Convertible Senior Notes due 2023, 1.50% | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, principal amount issued		$ 373,800,000
Debt instrument, interest rate stated percentage		1.50%
Net proceeds from issuance		$ 364,000,000.0
Net proceeds used to purchase capped call confirmations		$ 29,400,000
Debt instrument, conversion ratio		0.0127592
Conversion price (usd per share) | $ / shares		$ 78.37
Debt instrument, convertible threshold percentage		130.00%
Debt instrument, convertible threshold trading days | Days		20
Debt instrument, convertible threshold consecutive trading days | Days		30
Capped call confirmation premium percentage		85.00%
Initial cap price (usd per share) | $ / shares		$ 105.45
Convertible Senior Notes due 2023, 1.50% | Convertible Debt | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Repurchase price percentage of principal amount		100.00%
Convertible Senior Notes due 2023, 1.50% | Convertible Debt | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Repurchase price percentage of principal amount		100.00%
Convertible Senior Notes due 2023, 1.50%, Underwriters' Option | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, principal amount issued		$ 48,800,000
2.00% Convertible Senior Notes Due 2021
Debt Instrument [Line Items]
Debt instrument, principal amount issued			$ 460,000,000.0
Debt instrument, interest rate stated percentage			2.00%
Net proceeds used to purchase capped call confirmations			$ 36,600,000
Repurchase price percentage of principal amount								100.00%
Capped call confirmation premium percentage								85.00%
Debt instrument, frequency of period payment								semiannually in arrears on June 1 and December 1
Proceeds from issuance of 2021 Notes, net of issuance costs			447,800,000
Partial repurchase of 2020 Notes			370,200,000
Debt instrument, covenant description								There are no financial covenants associated with the 2021 Notes.
Interest expense						$ 7,200,000		$ 21,300,000
Amortization of discount and issuance costs						4,900,000		14,400,000
Contractual coupon interest						$ 2,300,000		$ 6,900,000
Effective interest rate						7.44%		7.44%
Accrued interest						$ 3,100,000		$ 3,100,000		800,000
Debt instrument amortization period								38 months
Initial cap price (usd per share) | $ / shares								$ 69.19
Debt instrument carrying value						389,668,000		$ 389,668,000		375,279,000
2.00% Convertible Senior Notes Due 2021 | Fair Value, Inputs, Level 3
Debt Instrument [Line Items]
Fair value of convertible notes						$ 498,500,000		$ 498,500,000		509,000,000.0
2.00% Convertible Senior Notes Due 2021 | Class C Capital Stock
Debt Instrument [Line Items]
Debt instrument, conversion ratio								0.0190985
Conversion price (usd per share) | $ / shares						$ 52.36		$ 52.36
Debt instrument, convertible threshold percentage								130.00%
Debt instrument, convertible threshold trading days | Days								20
Debt instrument, convertible threshold consecutive trading days								30 days
2.00% Convertible Senior Notes Due 2021, Over-Allotment Option
Debt Instrument [Line Items]
Debt instrument, principal amount issued			$ 60,000,000.0
2.75% Convertible Senior Notes Due 2020
Debt Instrument [Line Items]
Debt instrument, interest rate stated percentage											2.75%
Debt instrument, conversion ratio					0.0278303
Repurchase price percentage of principal amount								100.00%
Debt instrument, frequency of period payment								semi-annually on June 15 and December 15
Partial repurchase of 2020 Notes				$ 370,200,000
Debt instrument, covenant description								There are no financial covenants associated with the 2020 Notes.
Debt instrument carrying value						$ 9,600,000		$ 9,600,000		10,100,000	$ 230,000,000.0
Debt repurchase aggregate principal amount				$ 219,900,000
2.75% Convertible Senior Notes Due 2020 | Fair Value, Inputs, Level 3
Debt Instrument [Line Items]
Fair value of convertible notes						$ 16,700,000		$ 16,700,000		$ 17,600,000
2.75% Convertible Senior Notes Due 2020 | Class A Common Stock
Debt Instrument [Line Items]
Debt instrument, convertible threshold percentage								130.00%
Debt instrument, convertible threshold trading days | Days								20
Debt instrument, convertible threshold consecutive trading days								30 days
2.75% Convertible Senior Notes Due 2020 | Class A Common Stock | Class C Common Stock Distribution
Debt Instrument [Line Items]
Debt instrument, conversion ratio								0.0414550
Conversion price (usd per share) | $ / shares						$ 24.12		$ 24.12
2.75% Convertible Senior Notes Due 2020 | Class A Common Stock | Trulia Merger Agreement
Debt Instrument [Line Items]
Debt instrument, conversion ratio								0.0123567
Conversion price (usd per share) | $ / shares						$ 80.93		$ 80.93
Common stock exchange ratio								0.444
Revolving Credit Facility
Debt Instrument [Line Items]
Current borrowing capacity						$ 25,000,000.0		$ 25,000,000.0
Revolving credit facility, initial term	1 year
Revolving credit facility, extension of initial term	3 years
Availability limit, acquisition cost of residential property	85.00%
Availability limit, market value of residential property	85.00%
Amount available for future borrowings						$ 300,000		$ 300,000
Revolving Credit Facility | Credit Suisse AG, Cayman Islands Branch
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 250,000,000.0

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Debt - Outstanding Principal Amount and Carrying Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Convertible Senior Notes due 2023, 1.50%
Debt Instrument [Line Items]
Outstanding Principal Amount	$ 373,750
Unamortized Debt Discount and Debt Issuance Costs	(82,717)
Carrying Value	291,033
2.00% Convertible Senior Notes Due 2021
Debt Instrument [Line Items]
Outstanding Principal Amount	460,000	$ 460,000
Unamortized Debt Discount and Debt Issuance Costs	(70,332)	(84,721)
Carrying Value	$ 389,668	$ 375,279

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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Schedule Of Income Tax [Line Items]
Income tax expense (benefit)	$ (14,700)	$ 41	$ (8,000)	$ (22,700)	$ 41
Income tax expense (benefit), calculated using estimate of annual effective tax rate				$ 1,900
Effective tax rate				4.30%
Loss before income taxes	15,192	$ (9,247)		$ 44,876	$ 17,204
Discrete income tax benefit - stock compensation and impact of Tax Act				20,800
Adjustment to income tax (benefit) under the Tax Act	$ (3,300)			$ (5,900)
Federal
Schedule Of Income Tax [Line Items]
Net operating loss carryforwards						$ 1,014,000
State
Schedule Of Income Tax [Line Items]
Net operating loss carryforwards						$ 21,400

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Shareholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Millions		9 Months Ended	12 Months Ended
	Jul. 03, 2018 USD ($) $ / shares shares	Sep. 30, 2018 Vote shares	Dec. 31, 2017 shares
Class of Stock [Line Items]
Preferred stock, issued (in shares)		0	0
Preferred stock, outstanding (in shares)		0	0
Class A Common Stock
Class of Stock [Line Items]
Common stock issued (in shares)		0
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
Common stock converted (in shares)		0	0
Class C Capital Stock
Class of Stock [Line Items]
Public offering price (usd per share) | $ / shares	$ 57.00
Net proceeds from public offering | $	$ 360.3
Class C Capital Stock | Public Stock Offering
Class of Stock [Line Items]
Shares issued and sold (in shares)	6,557,017
Class C Capital Stock | Over-Allotment Option
Class of Stock [Line Items]
Shares issued and sold (in shares)	855,263

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Share-Based Awards - Zillow Group, Inc. Incentive Plan - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2018 shares
Amended and Restated 2011 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares)	18,400,000
Increase in number of shares of common and capital stock available for issuance percentage	3.50%
Increase in number of shares of common and capital stock available for issuance	10,500,000
2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price per share fixed	100.00%
2011 Plan | Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation arrangement by share based payment, award minimum exercisable period	3 months
Share based compensation arrangement by share based payment, award maximum exercisable period	12 months
2011 Plan | Option Awards | Vesting After 12 Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Vesting period	12 months
2011 Plan | Option Awards | Vesting After 36 Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	36 months
2011 Plan | Option Awards | Quarterly Vesting Over 4 Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
2011 Plan | Option Awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	7 years
2011 Plan | Option Awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
2011 Plan | Restricted Stock Units | Vesting After 12 Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
2011 Plan | Restricted Stock Units | Vesting After 36 Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	12.50%
2011 Plan | Restricted Stock Units | Minimum | Vesting After 12 Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	12 months
2011 Plan | Restricted Stock Units | Minimum | Vesting After 36 Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	6 months
2011 Plan | Restricted Stock Units | Maximum | Vesting After 12 Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
2011 Plan | Restricted Stock Units | Maximum | Vesting After 36 Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years 6 months

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Share-Based Awards - Summary of Option Award (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Number of Shares Subject to Existing Options
Beginning Balance (in shares)	26,645,206
Granted (in shares)	5,429,505
Exercised (in shares)	(5,177,060)
Forfeited or cancelled (in shares)	(610,688)
Ending Balance (in shares)	26,286,963	26,645,206
Ending balance (in shares)	14,128,452
Weighted- Average Exercise Price Per Share
Beginning Balance (usd per share)	$ 27.70
Granted (usd per share)	53.63
Exercised (usd per share)	22.14
Forfeited or cancelled (usd per share)	34.55
Ending Balance (usd per share)	33.99	$ 27.70
Vested and exercisable (usd per share)	$ 29.07
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-Average Remaining Contractual Life, Outstanding	6 years 2 months 26 days	5 years 8 months 19 days
Weighted-Average Remaining Contractual Life, Vested and exercisable	4 years 9 months 3 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Aggregate Intrinsic Value, Outstanding	$ 321,371	$ 355,739
Aggregate Intrinsic Value Vested, and exercisable	$ 220,974

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Share-Based Awards - Option Awards - Additional Information (Detail) $ in Millions	Sep. 30, 2018 USD ($)
Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized cost of unvested share-based compensation awards	$ 179.9

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Share-Based Awards - Restricted Stock Units - Additional Information (Detail) $ in Millions	Sep. 30, 2018 USD ($)
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost	$ 205.9

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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	42.00%	46.00%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Risk-free interest rate	2.84%	1.70%
Weighted-average expected life	4 years 6 months	4 years 3 months
Weighted-average fair value of options granted (usd per share)	$ 19.21	$ 15.79	$ 20.89	$ 14.40
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility			42.00%	46.00%
Risk-free interest rate			2.52%	1.67%
Weighted-average expected life			4 years 6 months	4 years 3 months
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility			45.00%	49.00%
Risk-free interest rate			2.84%	1.84%
Weighted-average expected life			5 years	4 years 9 months

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Share-Based Awards - Summary of Restricted Stock Units Activity (Detail) - Restricted Stock Units	9 Months Ended
	Sep. 30, 2018 $ / shares shares
Restricted Stock Units
Beginning balance (in shares) | shares	4,016,405
Granted (in shares) | shares	2,898,786
Vested (in shares) | shares	(1,288,746)
Forfeited or cancelled (in shares) | shares	(524,952)
Ending balance (in shares) | shares	5,101,493
Weighted- Average Grant- Date Fair Value
Unvested outstanding, beginning balance (usd per share) | $ / shares	$ 33.22
Granted (usd per share) | $ / shares	52.75
Vested (usd per share) | $ / shares	35.07
Forfeited or cancelled (usd per share) | $ / shares	38.50
Unvested outstanding, ending balance (usd per share) | $ / shares	$ 43.33

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Share-Based Awards - Effects of Share Based Compensation in Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	$ 41,682	$ 28,574	$ 111,366	$ 84,162
Cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	969	1,014	3,180	2,942
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	5,911	5,914	17,413	17,694
Technology and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	15,031	10,438	40,920	29,329
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	$ 19,771	$ 11,208	$ 49,853	$ 34,197

XML

Net Income (Loss) Per Share - Additional Information (Detail) shares in Millions	9 Months Ended
	Sep. 30, 2018 $ / shares shares
2.00% Convertible Senior Notes Due 2021
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Conversion spread, shares | shares	8.8
2.00% Convertible Senior Notes Due 2021 | Class C Capital Stock
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Conversion price (usd per share) | $ / shares	$ 52.36
Convertible Senior Notes due 2023, 1.50%
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Conversion spread, shares | shares	4.8
Convertible Senior Notes due 2023, 1.50% | Class C Capital Stock
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Conversion price (usd per share) | $ / shares	$ 78.37

XML

Net Income (Loss) Per Share - Denominator for Basic and Diluted Net Income (Loss) Per Share Calculation (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Denominator for basic calculation (in shares)	202,416	187,692	195,208	185,447
Effect of dilutive securities:
Denominator for dilutive calculation (in shares)	202,416	196,425	195,208	185,447
Option Awards
Effect of dilutive securities:
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	0	7,401	0	0
Restricted Stock Units
Effect of dilutive securities:
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	0	1,332	0	0

XML

Net Income (Loss) Per Share - Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Class A Common Stock and Class C Capital Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Class A common stock and Class C capital stock equivalents excluded from calculations of diluted net income (loss) per share	27,248	7,179	28,809	33,420
Class A Common Stock and Class C Capital Stock | Weighted Average | Option Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Class A common stock and Class C capital stock equivalents excluded from calculations of diluted net income (loss) per share	21,766	6,542	23,508	28,671
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]
Class A common stock and Class C capital stock equivalents excluded from calculations of diluted net income (loss) per share	5,072	199	4,891	4,311
Class A Common Stock | 2.75% Convertible Senior Notes Due 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Class A common stock and Class C capital stock equivalents excluded from calculations of diluted net income (loss) per share	410	438	410	438

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Commitments and Contingencies - Additional Information (Detail)			3 Months Ended		9 Months Ended
	Jun. 20, 2017 USD ($)	Feb. 09, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($) claim	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($) claim	Feb. 28, 2018 claim	Dec. 31, 2017 USD ($)
Other Commitments [Line Items]
Operating lease expense			$ 5,800,000	$ 5,700,000	$ 17,200,000	$ 15,800,000
Outstanding surety bonds			3,500,000		3,500,000			$ 3,700,000
VHT Vs Zillow Group Inc.
Other Commitments [Line Items]
Jury awarded damages	$ 4,100,000	$ 79,875
Estimated liability			4,100,000		4,100,000			$ 4,100,000
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		2
Shareholder Derivative Lawsuits
Other Commitments [Line Items]
Number of pending claims | claim							4
Homes under contract to purchase that have not closed
Other Commitments [Line Items]
Value of homes under contract that have not closed			$ 30,300,000		$ 30,300,000

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Self-Insurance - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Insurance [Abstract]
Percentage of cumulative medical claim under self insurance plan (percent exceeded)	125.00%
Limit of medical claim under self insurance plan (limit)	$ 1,000,000.0
Minimum amount of individual claim under self insurance plan	150,000
Liability for self-insured claims included in accrued compensation and benefits	$ 3,000,000.0	$ 2,000,000.0

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Employee Benefit Plan - Additional Information (Detail) - Zillow Merger - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
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	$ 4.1	$ 3.0	$ 11.9	$ 8.9

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Segment Information and Revenue - Additional Information (Detail) - segment	6 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Segment Reporting [Abstract]
Number of reportable segments	2	1

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Segment Information and Revenue - Revenue Categories (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue:
Total revenue		$ 343,094	$ 281,839	$ 968,219	$ 794,464
Costs and expenses:
Cost of revenue		36,672	22,152	86,118	62,644
Sales and marketing		128,734	107,108	413,752	344,266
Technology and development		105,314	83,389	299,623	234,798
General and administrative		70,743	54,226	187,395	153,038
Impairment costs		10,000	0	10,000	0
Acquisition-related costs		1,405	218	2,064	366
Integration costs		523	0	523	0
Total costs and expenses		353,391	267,093	999,475	795,112
Income (loss) from operations		(10,297)	14,746	(31,256)	(648)
Other income		7,773	1,407	13,308	3,970
Interest expense		(12,668)	(6,906)	(26,928)	(20,526)
Loss before income taxes		(15,192)	9,247	(44,876)	(17,204)
Premier Agent
Revenue:
Total revenue		232,703		677,320
Rentals
Revenue:
Total revenue		37,319		99,670
Mortgages
Revenue:
Total revenue		18,438		56,766
Other
Revenue:
Total revenue		43,616		123,445
Homes
Revenue:
Total revenue		11,018		11,018
IMT
Revenue:
Total revenue		332,076	281,839	957,201	794,464
Costs and expenses:
Cost of revenue	[1]	26,386	22,152	75,832	62,644
Sales and marketing		123,755		405,525
Technology and development		99,570		286,983
General and administrative		65,156		172,756
Impairment costs		10,000		10,000
Acquisition-related costs		1,405		2,064
Integration costs		523		523
Total costs and expenses		326,795		953,683
Income (loss) from operations		5,281		3,518
Other income		7,773		13,308
Interest expense		(12,236)		(26,496)
Loss before income taxes		818		(9,670)
IMT | Premier Agent
Revenue:
Total revenue		232,703		677,320
IMT | Rentals
Revenue:
Total revenue		37,319		99,670
IMT | Mortgages
Revenue:
Total revenue		18,438		56,766
IMT | Other
Revenue:
Total revenue		43,616		123,445
IMT | Homes
Revenue:
Total revenue		0		0
Homes
Revenue:
Total revenue		11,018	0	11,018	0
Costs and expenses:
Cost of revenue	[1]	10,286	$ 0	10,286	$ 0
Sales and marketing		4,979		8,227
Technology and development		5,744		12,640
General and administrative		5,587		14,639
Impairment costs		0		0
Acquisition-related costs		0		0
Integration costs		0		0
Total costs and expenses		26,596		45,792
Income (loss) from operations		(15,578)		(34,774)
Other income		0		0
Interest expense		(432)		(432)
Loss before income taxes		(16,010)		(35,206)
Homes | Premier Agent
Revenue:
Total revenue		0		0
Homes | Rentals
Revenue:
Total revenue		0		0
Homes | Mortgages
Revenue:
Total revenue		0		0
Homes | Other
Revenue:
Total revenue		0		0
Homes | Homes
Revenue:
Total revenue		$ 11,018		$ 11,018

[1] Three Months EndedSeptember 30,?Nine Months EndedSeptember 30,?2018?2017?2018?2017?____________________(1) Amortization of website development costs and intangible assets included in technology and development$18,165?$23,537?$61,735?$69,957

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Subsequent Events (Details) $ in Millions	Oct. 31, 2018 USD ($)
MLOA | Subsequent Event
Subsequent Event [Line Items]
Purchase price	$ 65.0