X0609 4 2026-10-20 0 0001616707 Wayfair Inc. W 0001867558 Tan Fiona false C/O WAYFAIR INC., 4 COPLEY PLACE BOSTON MA 02116 0 1 0 0 Chief Technology Officer 1 Class A Common Stock 2026-10-20 4 S 0 8000 115 D 196698 I By Revocable Trust The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan established by the reporting person on behalf of the revocable trust, as trustee, on June 1, 2026. 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. /s/Enrique Colbert, Attorney-In-Fact for Fiona Tan 2026-10-22