X0306 4 2021-06-14 0 0001600641 1stdibs.com, Inc. DIBS 0001572685 Cohler Matt C/O BENCHMARK 2965 WOODSIDE ROAD WOODSIDE CA 94062 1 0 1 0 Common Stock 2021-06-14 4 C 0 3610333 A 3610333 I See footnote Common Stock 2021-06-14 4 C 0 43583 A 43583 I See footnote Series A Preferred Stock 2021-06-14 4 C 0 3610333 0.00 D Common Stock 3610333 0 I See footnote Series B Preferred Stock 2021-06-14 4 C 0 43583 0.00 D Common Stock 43583 0 I See footnote The Issuer's Series A Preferred Stock converted into Common Stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering (the "IPO"). Shares are held directly by Benchmark Capital Partners VII, L.P. ("BCP VII") for itself and as nominee for Benchmark Founders' Fund VII, L.P. ("BFF VII") and Benchmark Founders' Fund VII-B, L.P. ("BFF VII-B"). Benchmark Capital Management Co. VII, L.L.C. ("BCMC VII"), the general partner for BCP VII, BFF VII and BFF VII-B may be deemed to have sole voting and dispositive power over the securities. Matthew R. Cohler, a member of the Issuer's board of directors, Bruce W. Dunlevie, Peter H. Fenton, J. William Gurley, Kevin R. Harvey, Mitchell H. Lasky and Steven M. Spurlock are the managing members of BCMC VII, and each of them may be deemed to share voting and dispositive power over the securities held by such entities. Each such person and entity disclaims the existence of a "group" and disclaims beneficial ownership of the securities, except to the extent of such person's or entity's pecuniary interest in such securities. The Issuer's Series B Preferred Stock converted into Common Stock on a 1-for-1 basis immediately prior to the closing of the Issuer's IPO. This report is one of three reports, each on a separate Form 3, but relating to the same holdings being filed by entities affiliated with Benchmark and their applicable members. The filing of this statement shall not be deemed an admission that the reporting person is, for purposes of Section 16 of the Exchange Act or otherwise, the beneficial owner of any equity securities covered by this statement. /s/ An-Yen Hu, by power of attorney for Matthew R. Cohler 2021-06-16