Indicate by check mark whether the registrant (1)has filed all reports required to be filed by Section13 or 15(d) of the Securities Exchange Act of 1934during the preceding 12months (or for such shorter period that the registrant was required to file such reports), and (2)has been subject to such filingrequirements for the past 90days. Yes☒No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule405 ofRegulationS-T (§ 232.405 of this chapter) during the preceding 12months (or for such shorter period that the registrant was required to submit such files).Yes☒No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or anemerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” inRule12b-2 of the Exchange Act: ☒Accelerated filer☐Smaller reporting companyEmerging 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 anynew 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 Rule12b-2 of the Exchange Act). Yes☐No☒ WAYFAIR INC.INDEX TO QUARTERLY REPORT ON FORM10-QFor the Quarterly Period Ended March31, 2026 Item 1.Financial Statements1Condensed Consolidated Balance Sheets as of March 31, 2026 and December 31, 20251Condensed Consolidated Statements of Operations for the Three Months Ended March 31, 2026 and 20252Condensed Consolidated Statements of Comprehensive Loss for the Three Months Ended March 31, 2026 and20253Condensed Consolidated Statements of Stockholders' Deficit for the Three Months Ended March 31, 2026 and20254Condensed Consolidated Statements of Cash Flows for the Three Months Ended March 31, 2026 and 20255Notes to Condensed Consolidated Financial Statements7Item 2.Management’s Discussion and Analysis of Financial Condition and Results of Operations21Item 3.Quantitative and Qualitative Disclosures About Market Risk36Item 4.Controls and Procedures36Part II. OTHER INFORMATION36Item 1.Legal Proceedings36Item 1A.Risk Factors37Item 2.Unregistered Sales of Equity Securities and Use of Proceeds37Item 5.Other Information37Item 6.Exhibits37Signatures39 WAYFAIR INC.CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS(Unaudited) WAYFAIR INC.CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS(Unaudited) WAYFAIR INC.CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS(Unaudited) WAYFAIR INC.CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS(Unaudited) Wayfair Inc.Notes to Condensed Consolidated Financial Statements(Unaudited) 1. Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed consolidated financial statements contained in this Quarterly Report on Form 10-Q are those ofWayfair Inc. and its wholly-owned subsidiaries. Unless the context indicates otherwise, “Wayfair,” “the Company" or similar terms refer toWayfair Inc. and its subsidiaries. In the Company’s opinion, the accompanying unaudited condensed consolidated financial statements have beenprepared in accordance with generally accepted accounting principles in the United States ("GAAP") and applicable rules and regulations of theUnited States (“U.S.”) Securities and Exchange Commission ("SEC") regarding interim financial reporting and reflect all adjustments,consisting of normal recurring adjustments, necessary for a fair statement of the results of the interim periods presented. Certain information andnote disclosures normally included in the audited financial statements prepared in accordance with GAAP have been condensed or omittedpursuant to such rules and regulations. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with theaudited consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year endedDecember31, 2025. Furthermore, interim results are not necessarily indicative of the results for the full year ended December31, 2026 or futureperiods. The Company has identified significant accounting policies that are critical to understanding its business and results of operations. Wayfairbelieves that there have been no significant changes during the three months ended March31, 2026 to the items disclosed in Note 1,Summary ofSignificant Accounting Policies, included in Part II, Item 8, Financial Statements and Supplementary Data, of the Company’s Annual Report onForm 10-K for the year ended December31, 2025. Adoption of New Accounting Principles Wayfair adopted ASU 2024-04,Debt - Debt with Conversion and Other Options (Subtopic 470-20): Induced Conversions ofConvertible Debt Instrument