X0508 4 2026-01-01 0 0001616707 Wayfair Inc. W 0001950170 Gulliver Kate C/O WAYFAIR INC., 4 COPLEY PLACE BOSTON MA 02116 0 1 0 0 CFO and Chief Admin Officer 1 Class A Common Stock 2026-01-01 4 M 0 391 0 A 175888 D Class A Common Stock 2026-01-01 4 M 0 217 0 A 176105 D Class A Common Stock 2026-01-01 4 M 0 584 0 A 176689 D Class A Common Stock 2026-01-01 4 M 0 18001 0 A 194690 D Class A Common Stock 2026-01-01 4 F 0 8955 106.56 D 185735 D Class A Common Stock 2026-01-02 4 S 0 36497 106.50 D 149238 D Restricted Stock Unit ("RSU") 2026-01-01 4 M 0 391 0 D Class A Common Stock 391 1176 D Restricted Stock Unit ("RSU") 2026-01-01 4 M 0 217 0 D Class A Common Stock 217 1092 D Restricted Stock Units ("RSUs") 2026-01-01 4 M 0 584 0 D Class A Common Stock 584 2296 D Restricted Stock Unit ("RSU") 2026-01-01 4 M 0 18001 0 D Class A Common Stock 18001 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 sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 6, 2025. Each RSU represents a contingent right to receive one share of Class A Common Stock when vested. These RSUs, which were granted on November 11, 2021, 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, 392 shares will vest on each of April 1, 2026, July 1, 2026, and October 1, 2026. 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, 217 shares will vest on April 1, 2026, and an aggregate amount of 875 shares will vest in substantially equal quarterly amounts commencing July 1, 2026. These RSUs, which were granted on February 1, 2023, 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, 584 shares will vest on April 1, 2026, and an aggregate amount of 1,712 shares will vest in 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 Kate Gulliver 2026-01-05