Description of Business and Summary of Significant Accounting Policies:

Description of Business—Redfin Corporation (“Redfin” or the “Company”) was incorporated in October 2002 and is headquartered in Seattle, Washington. The Company operates an online real estate marketplace and provides real estate services, including assisting individuals in the purchase or sale of their residential property. The Company also provides title and settlement services, originates and sells mortgages, and buys and sells residential property. The Company has operations located in multiple states nationwide.

Basis of Presentation—The consolidated financial statements and accompanying notes have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”). The Company had no components of other comprehensive income (loss) during any of the years presented, as such, a consolidated statement of comprehensive income (loss) is not presented. All amounts are presented in thousands, except share and per share data.

Principles of Consolidation—The consolidated financial statements include the accounts of Redfin and its wholly owned subsidiaries. Intercompany transactions and balances have been eliminated.

Certain Significant Risks and Business Uncertainties—The Company is subject to the risks and challenges associated with companies at a similar stage of development. These include dependence on key individuals, successful development and marketing of its offerings, and competition with larger companies with greater financial, technical, and marketing resources. Further, during the period required to achieve substantially higher revenue in order to become profitable, the Company may require additional funds that may not be readily available or may not be on terms that are acceptable to the Company.

The Company operates in the online real estate marketplace and, accordingly, can be affected by a variety of factors. For example, management of the Company believes that any of the following factors could have a significant negative effect on the Company’s future financial position, results of operations, and cash flows: unanticipated fluctuations in operating results due to seasonality and cyclicality in the real estate industry, changes in home sale prices and transaction volumes, the Company’s ability to increase market share, competition and U.S. economic conditions. Since inception through December 31, 2017, the Company has incurred losses from operations and accumulated a deficit of $129,003, and has been dependent on equity financing to fund operations.

Reverse Stock Split—On July 8, 2017, the Company’s board of directors approved an amendment to its certificate of incorporation to effect a reverse split of shares of the issued and outstanding common stock and redeemable convertible preferred stock at a 3-to-1 ratio. The reverse stock split was approved by the Company’s stockholders and effected on July 10, 2017. The par value of the common stock and the par value of the redeemable convertible preferred stock were not adjusted as a result of the reverse stock split. All issued and outstanding shares of common stock and redeemable convertible preferred stock, dividend rates, conversion rates, options to purchase common stock, exercise prices, and the related per-share amounts contained in these consolidated financial statements have been retroactively adjusted to reflect this reverse stock split for all periods presented.

Initial Public Offering—On August 2, 2017, the Company completed an initial public offering (the "IPO") whereby 10,615,650 shares of common stock were sold at a price of $15.00 per share, which included 1,384,650 shares pursuant to the underwriters' option to purchase additional shares. The Company received net proceeds of $144,380 after deducting the underwriting discount and offering expenses directly attributable to the IPO. Upon the closing of the IPO, all shares of the outstanding redeemable convertible preferred stock automatically converted into 55,422,002 shares of common stock on a one-for-one basis.

Initial Public Offering Costs—Costs, including legal, accounting and other fees and costs relating to the IPO are accounted for a reduction in additional paid-in capital. Costs incurred prior to the IPO were capitalized and included as a noncurrent asset in the consolidated balance sheets. There were $720 of capitalized deferred offering costs as of December 31, 2016. Aggregate offering expenses totaled $3,708.

Use of Estimates—The preparation of consolidated financial statements, in conformity with GAAP, requires management to make estimates and assumptions that affect the reported amounts of

assets and liabilities and results of operations during the respective periods. The Company’s more significant estimates include, but are not limited to, valuation of deferred income taxes, stock-based compensation, fair value of common stock and redeemable convertible preferred stock, capitalization of website development costs, recoverability of intangible assets with finite lives, and the fair value of reporting units for purposes of evaluating goodwill for impairment. The amounts ultimately realized from the affected assets or ultimately recognized as liabilities will depend on, among other factors, general business conditions and could differ materially in the near term from the carrying amounts reflected in the consolidated financial statements.

Cash and Cash Equivalents—The Company considers all highly liquid investments with original maturities of three months or less at the date of purchase to be cash equivalents. Cash equivalents consist primarily of money market instruments.

Restricted Cash and Other Payables—Restricted cash primarily consists of cash held in escrow on behalf of real estate buyers using the Company’s title and settlement services. Since the Company does not have rights to the cash, a corresponding customer deposit liability in the same amount is recognized in the consolidated balance sheets in other payables. When a real estate transaction closes, the restricted cash transfers from escrow and the corresponding deposit liability is reduced.

Short-Term Investments—The Company’s short-term investments consisted of certificates of deposit with maturities of 12 months or less from the balance sheet date. Short-term investments are reported at cost, which approximates fair value, as of each balance sheet date. As of December 31, 2017 the Company no longer held any short-term investments.

Concentration of Credit Risk—Financial instruments that potentially subject the Company to concentrations of credit risk are primarily cash and cash equivalents. The Company generally places its cash and cash equivalents and short-term investments with high-credit-quality counterparties to make sure the financial institutions are stable when the Company’s deposits exceed Federal Deposit Insurance Corporation limits, and by policy, limit the amount of credit exposure to any one counterparty based on the Company’s analysis of the counterparty’s relative credit standing. The Company maintains its cash accounts with financial institutions where, at times, deposits exceed federal insurance limits.

Other Assets and Other Current Assets—Other assets consists primarily of leased building security deposits. In May 2016, the Company signed a new lease for its corporate headquarters with a security deposit of $5,424.

At December 31, 2016 other current assets consisted primarily of a receivable, for $8,470, due from the landlord related to the Company's corporate headquarters leasehold improvements. The Company collected the receivable in April 2017. Additionally, in January 2017, RDFN Ventures, Inc. (“Redfin Now”), a wholly owned subsidiary of the Company, began purchasing residential properties with the intent of resale. Direct property acquisition and improvement costs are capitalized and tracked directly with each specific property. Home inventories are stated at cost unless the utility of the properties is no longer as great as their cost, in which case it is written down to “market.” As of December 31, 2017 there were $3,382 in home inventories included in other current assets. Of the $3,382 in home inventories, $2,335 were listed for sale and $1,047 were in process and being made ready for sale. As of December 31, 2017, all properties were carried at cost.

Loans Held for Sale—Redfin Mortgage, LLC (“Redfin Mortgage”), a wholly owned subsidiary of the Company, began originating residential mortgage loans in March 2017. Such mortgage loans are intended to be sold in the secondary mortgage market within a short period of time following origination. Mortgage loans held for sale consist of single-family residential loans collateralized by the underlying property. Mortgage loans held for sale are stated at the lower of cost or market value. As of December 31, 2017 there were $1,891 of mortgage loans held for sale.

Property and Equipment—Property and equipment are recorded at cost and depreciated using the straight-line method over the estimated useful life of two to seven years. Depreciation and amortization is included in cost of revenue, technology and development, and general and administrative and is allocated based on estimated usage for each class of asset.

Leasehold improvements are amortized over the shorter of the lease term or the estimated useful life of the related asset. Upon retirement or sale, the cost of assets disposed of and the related accumulated depreciation are removed from the accounts, and any resulting gain or loss is reflected in the consolidated statements of operations. Repair and maintenance costs are expensed as incurred.

Costs incurred in the preliminary stages of website and software development are expensed as incurred. Once an application has reached the development stage, direct internal and external costs relating to upgrades or enhancements that meet the capitalization criteria are capitalized in property and equipment and amortized on a straight-line basis over their estimated useful lives. Maintenance and enhancement costs (including those costs in the post- implementation stages) are typically expensed as incurred, unless such costs relate to substantial upgrades and enhancements to the websites (or software) that result in added functionality, in which case the costs are capitalized as well.

Capitalized software development activities placed in service are amortized over the expected useful lives of those releases. The Company views capitalized software costs as either internal use or expansion. Currently, internal use and expansion useful lives are estimated at one year and three years, respectively.

Estimated useful lives of website and software development activities are reviewed annually or whenever events or changes in circumstances indicate that intangible assets may be impaired and adjusted as appropriate to reflect upcoming development activities that may include significant upgrades or enhancements to the existing functionality. The Company capitalized software development costs of $2,824, $3,194, and $4,619 during the years ended December 31, 2015, 2016, and 2017, respectively.

Intangible Assets—Intangible assets are finite lived and mainly consist of trade names, developed technology and customer relationships and are amortized over their estimated useful lives of ten years. The useful lives were determined by estimating future cash flows generated by the acquired intangible assets. Amortization expense is included in cost of revenue.

Impairment of Long-Lived Assets—Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Recoverability of assets to be held and used is measured first by a comparison of the carrying amount of an asset to future undiscounted net cash flows expected to be generated by the asset. If such asset were considered to be impaired, an impairment loss would be recognized when the carrying amount of the asset exceeds the fair value of the asset. To date, no such impairment has occurred.

Goodwill—Goodwill represents the excess of the purchase price over the fair value of the net tangible assets and identifiable intangible assets acquired in a business combination. Goodwill is not amortized, but is subject to impairment testing. The Company assesses the impairment of goodwill on an annual basis, on October 1, or whenever events or changes in circumstances indicate that goodwill may be impaired. The Company assesses goodwill for possible impairment by performing a qualitative assessment to determine whether it is more likely than not that the fair value of the reporting unit is less than its carrying amount. If the Company qualitatively determines that it is not more likely than not that the fair value of the reporting unit is less than its carrying amount, then no additional impairment steps are necessary.

For the Company’s most recent impairment assessment performed as of October 1, 2017, the Company performed a qualitative assessment and determined that it was not more likely than not that the fair value of its reporting unit for which goodwill has been assigned was less than its carrying amount. In evaluating whether it was more likely than not that the fair value of its reporting unit was less than its carrying amount the Company considered macroeconomic conditions, industry and market considerations, cost factors, its overall financial performance, other relevant entity-specific events, potential events affecting its reporting unit, and changes in the fair value of the Company’s common stock. The primary qualitative factors the Company considered in its analysis as of October 1, 2017 were the Company’s overall financial performance and the fair value of the reporting unit for which goodwill was assigned, which was substantially in excess of its book value. The aggregate carrying value of goodwill was $9,186 at December 31, 2016 and 2017. Goodwill is assigned to the Company’s real estate services reporting unit, and there have been no accumulated impairments to goodwill.

Leases—The Company categorizes leases at their inception as either operating or capital leases. On certain lease agreements, the Company may receive rent holidays and other incentives. The Company recognizes lease costs on a straight-line basis without regard to deferred payment terms, such as rent holidays, that defer the commencement date of required payments. Additionally, incentives the Company receives are treated as a reduction of rent expense over the term of the agreement and are presented in leasehold improvements and deferred rent on the balance sheet.

Derivative Instruments—Redfin Mortgage is party to interest rate lock commitments (“IRLCs”) with customers resulting from mortgage origination operations. IRLCs for single family mortgage loans that Redfin Mortgage intends to sell are considered free-standing derivatives. All free-standing derivatives are required to be recorded on the Company’s consolidated balance sheets at fair value. Because Redfin Mortgage can terminate a loan commitment if the borrower does not comply with the terms of the contract, and some loan commitments may expire without being drawn upon, these commitments do not necessarily represent future cash requirements. The Company does not use derivatives for trading purposes.

Interest rate market risk, related to the residential mortgage loans held for sale and IRLCs, is offset using investor loan commitments. Changes in the fair value of IRLCs and forward sales commitments are recognized in revenue, and the fair values are reflected in other current assets and accrued liabilities, as applicable. The Company considers several factors in determining the fair value including the fair value in the underlying loan resulting from the exercise of the commitment and the probability that the loan will not fund according to the terms of the commitment (referred to as a pull-through factor). The value of the underlying loan is affected primarily by changes in interest rates.

Income Taxes—Income taxes are accounted for using an asset and liability approach that requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the consolidated financial statement and tax bases of assets and liabilities at the applicable enacted tax rates. The Company will establish a valuation allowance for deferred tax assets if it is more likely than not that these items will expire before either the Company is able to realize their benefit or that future deductibility is uncertain.

The Company believes that it is currently more likely than not that its deferred tax assets will not be realized and as such, it has recorded a full valuation allowance for these assets. The Company evaluates the likelihood of the ability to realize deferred tax assets in future periods on a quarterly basis, and when appropriate evidence indicates it would release its valuation allowance accordingly. The determination to provide a valuation allowance is dependent upon the assessment of whether it is more likely than not that sufficient taxable income will be generated to utilize the deferred tax assets. Based on the weight of the available evidence, which includes the Company’s historical operating losses, lack of taxable income, and accumulated deficit, the Company provided a full valuation allowance against the U.S. tax assets resulting from the tax losses and credits carried forward.

In addition, current tax laws impose substantial restrictions on the utilization of research and development credit and net operating loss (“NOL”) carryforwards in the event of an ownership change, as defined by Internal Revenue Code Sections 382 and 383. Such an event, having occurred in the past or in the future, may significantly limit the Company’s ability to utilize its NOLs and research and development tax credit carryforwards. In 2017, the Company completed a Section 382 study. The study determined that the Company underwent an ownership change in 2006. Due to the Section 382 limitation determined on the date of the ownership change in 2006, NOL and R&D credits were reduced by $1,506 and $32, respectively.

Revenue Recognition—Revenue primarily consists of commissions and fees charged on each real estate transaction completed by the Company or its partner agents. The Company’s key revenue components are brokerage revenue, partner revenue, and other revenue. The Company recognizes commission-based brokerage revenue upon closing of a real estate transaction, net of any commission refund or any closing-cost reduction. Partner revenue consists of fees earned by referring customers to partner agents. Partner revenue is earned and recognized when partner agents close a referred transaction, net of any refund provided to customers. Fees and revenue from other services are recognized when the service is provided. Revenue earned from selling homes previously purchased by Redfin Now is recorded at closing on a gross basis, representing the sales price of the home.

Revenue earned but not received is recorded as accrued revenue on the accompanying consolidated balance sheets, net of an allowance for doubtful accounts. Commission revenue is known and is clearing escrow, and therefore it is not estimated.

The Company establishes an allowance for doubtful accounts after reviewing historical experience, age of accounts receivable balances and any other known conditions that may affect collectability. The allowance for doubtful accounts balance was $150 as of December 31, 2016 and $160 as of December 31, 2017. During the year ended December 31, 2016 there were $290 of charges and $140 of write-offs to the allowance. During the year ended December 31, 2017 there were $81 of charges and $71 of write-offs to the allowance.

Cost of Revenue—Cost of revenue consists of personnel costs (including base pay and benefits), stock-based compensation, transaction bonuses, home-touring and field expenses, listing expenses, office and occupancy expenses, depreciation and amortization related to fixed assets and acquired intangible assets, and, for Redfin Now, the cost of homes including the purchase price and capitalized improvements.

Technology and Development—Technology and development costs, which include research and development costs, are expensed as incurred and primarily include personnel costs (including base pay and benefits), stock-based compensation, data licenses, software and equipment, and infrastructure such as for data centers and hosted services. Technology and development expenses also include amortization of capitalized internal-use software and website and mobile application development costs.

Advertising and Advertising Production Costs—The Company expenses advertising costs as they are incurred and production costs as of the first date the advertisement takes place. Advertising costs totaled $8,394, $17,570, and $21,902 in 2015, 2016, and 2017 respectively, and are included in marketing expenses. Advertising production costs totaled $1,661, $1,640, and $1,609 in 2015, 2016, and 2017, respectively, and are included in marketing expenses.

Stock-based Compensation—The Company measures expense for options to purchase common stock and restricted stock units at fair value on the grant date and recognizes the expense over the requisite service period on a straight-line basis. The fair value of options to purchase common stock was calculated using the Black-Scholes-Merton option-pricing model. Through December 31, 2016, the Company recognized compensation expense for only the portion of options expected to vest using an estimated forfeiture rate that is derived from historical employee termination behavior. On January 1, 2017, the Company adopted Accounting Standards Update (“ASU”) 2016-09 and elected to recognize forfeitures as they occur rather than estimate forfeitures. The Company has a stock-based compensation plan that is more fully described in Note 7.

Recently Adopted Accounting Pronouncements—In November 2016, the Financial Accounting Standards Board ("FASB") issued guidance on the classification and presentation of changes in restricted cash on the statement of cash flows. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017, and early adoption is permitted. The adoption of this guidance requires a retrospective transition method to each period presented. The Company early adopted this guidance on October 1, 2017. Upon adoption, the following balances were reclassified: restricted cash to the reconciliation of change in cash, cash equivalents and restricted cash, and other payables related to cash held in escrow on behalf of customers to financing activities. In the Company’s capacity as fiduciary, the cash receipt is a function of providing the customer with a service (title). Therefore, the escrow funds payable are akin to a repayment of debt, a financing activity, whereby the Company in its role as fiduciary is temporarily holding cash in its restricted accounts on behalf of its customers and subsequently releases the cash to settle the customers' contractual obligation. This reclassification will maintain an accurate reflection of the Company's cash flows from operating activities. The reconciliation of amounts previously reported to the revised amounts upon adoption are as follows:



	Previously reported			Adjustments			As revised

Year Ended December 31, 2015
Operating activities	$	(22,160	)	$	(61	)	$	(22,221	)
Financing activities	1,723			1,822			3,545
Net change in cash, cash equivalents, and restricted cash (1)	$	(25,004	)	$	(1,761	)	$	(23,243	)

Year Ended December 31, 2016
Operating activities	$	(9,345	)	$	(7	)	$	(9,352	)
Financing activities	1,345			399			1,744
Net change in cash, cash equivalents, and restricted cash (1)	$	(21,567	)	$	(392	)	$	(21,175	)

(1) Previously titled: net change in cash and cash equivalents

In January 2017, the FASB issued guidance simplifying the test for goodwill impairment. Step 2 from the goodwill impairment test is no longer required, instead requiring an entity to recognize a goodwill impairment charge for the amount by which the goodwill carrying amount exceeds the reporting unit’s fair value. This guidance is effective for interim and annual goodwill impairment tests in fiscal years beginning after December 15, 2019, and early adoption is permitted. This guidance must be applied on a prospective basis. The Company adopted this guidance for interim and annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company performs its goodwill assessment annually on October 1 of each year or as events merit, with the last test performed on October 1, 2017. The adoption of this guidance did not have any impact on the Company's financial position, results of operations or cash flows.

In March 2016, the FASB issued guidance on several aspects of the accounting for share-based payment transactions, including the income tax consequences, impact of forfeitures, classification of awards as either equity or liabilities and classification on the statement of cash flows. This guidance is effective for interim and annual reporting periods beginning after December 15, 2016, and early adoption is permitted. The Company adopted this guidance on January 1, 2017 using the modified retrospective approach through a cumulative-effect adjustment of $522 to beginning accumulated deficit, and the Company elected to account for forfeitures as they occur beginning on January 1, 2017. The adoption of this guidance did not have a material impact on the Company’s financial position, results of operations or cash flows.

Recently Issued Accounting Pronouncements—In August 2016, the FASB issued guidance on the classification of certain cash receipts and cash payments in the statement of cash flows. This new standard will make eight targeted changes to how cash receipts and cash payments are presented and classified in the statement of cash flows. The new standard is effective for fiscal years beginning after December 15, 2017, which means that it will be effective for the Company in its fiscal year beginning January 1, 2018. The new standard will require adoption on a retrospective basis unless it is impracticable to apply, in which case the Company would be required to apply the amendments prospectively as of the earliest date practicable. The adoption of this standard is not expected to have a material impact on the Company’s statement of cash flows.

In February 2016, the FASB issued a new standard to account for leases. This standard requires the recognition of a right-of-use asset and lease liability on the balance sheet for all leases. This standard 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, and should be applied through a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, and early adoption is permitted. The Company expects to adopt this guidance on January 1, 2019. Although the Company is in the process of evaluating the impact of adoption of the ASU on its consolidated financial statements, the Company currently believes the most significant changes will be related to the recognition of new right-of-use assets and lease liabilities on the Company's balance sheet for real estate operating leases.

In May 2014, the FASB issued a new standard to account for revenue. This guidance provides 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 goods or services. This guidance also 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. The Company will adopt this guidance on January 1, 2018, using the modified retrospective adoption methodology. Both real estate and other revenue contain single performance obligations and the Company believes the timing of the satisfaction of the performance obligations, triggering the recognition of revenue, will not differ from the Company's current timing for recognizing revenue. The assessment of the policy changes and quantitative and qualitative impacts is complete and as the amounts and timing of real estate and other revenue will not change, the Company will not recognize a cumulative adjustment to retained earnings upon adoption.