X0508 4 2026-01-01 0 0001616707 Wayfair Inc. W 0001867558 Tan Fiona C/O WAYFAIR INC., 4 COPLEY PLACE BOSTON MA 02116 0 1 0 0 Chief Technology Officer 0 Class A Common Stock 2026-01-01 4 M 0 1635 0 A 1635 D Class A Common Stock 2026-01-01 4 M 0 21641 0 A 23276 D Class A Common Stock 2026-01-01 4 F 0 11906 106.56 D 11370 D Class A Common Stock 209328 I By Revocable Trust Restricted Stock Unit ("RSU") 2026-01-01 4 M 0 1635 0 D Class A Common Stock 1635 6431 D Restricted Stock Unit ("RSU") 2026-01-01 4 M 0 21641 0 D Class A Common Stock 21641 0 D These shares represent the number of shares of Class A Common Stock withheld by the issuer to satisfy the reporting person's tax withholding obligation upon the vesting of the RSUs reported in this Form 4. The reporting person is the trustee of the revocable trust, and members of the reporting person's immediate family are the sole beneficiaries of the revocable trust. Each RSU represents a contingent right to receive one share of Class A Common Stock when vested. These RSUs, which were granted on April 18, 2022, vest upon the satisfaction of a service condition and have no expiration date. With respect to the number of shares that have not vested, subject to continued service on each applicable vesting date, 1,636 shares will vest on April 1, 2026, and an aggregate amount of 4,795 shares will vest in substantially equal quarterly amounts commencing July 1, 2026. These RSUs, which were granted on December 21, 2025, vest upon the satisfaction of a service condition and have no expiration date. The service condition was fully satisfied on January 1, 2026. /s/Enrique Colbert, Attorney-In-Fact for Fiona Tan 2026-01-05