1stdibs.com, Inc. — Major Shareholding Notification 2025

Aug 14, 2025

xml version="1.0" encoding="UTF-8"? Generated by Workiva SCHEDULE 13G/A 0001237860 XXXXXXXX LIVE 3 Common Stock, $0.01 par value per share 06/30/2025 0001600641 1stdibs.com, Inc. 320551104 300 PARK AVENUE SOUTH 10TH FLOOR NEW YORK NY 10010 David S. Rosenblatt b X1 3904520.00 0.00 3904520.00 0.00 3904520.00 Y 10.2 IN Bessemer Trust Company of Delaware, N.A., as Trustee of the 2024 Laura Thalheimer Rosenblatt Family Trust u/a/d April 1, 2024 b DE 22500.00 0.00 22500.00 0.00 22500.00 N 0.1 OO 2012 David Rosenblatt Family Trust dated November 30, 2012 b NY 665302.00 0.00 665302.00 0.00 665302.00 N 1.8 OO 1stdibs.com, Inc. 300 PARK AVENUE SOUTH, 10TH FLOOR, NEW YORK, NY, 10010 David S. Rosenblatt 2012 David Rosenblatt Family Trust dated November 30, 2012 Bessemer Trust Company of Delaware, N.A., as Trustee of the 2024 Laura Thalheimer Rosenblatt Family Trust u/a/d April 1, 2024 c/o 1stdibs.com, Inc. 300 Park Avenue South 10th Floor New York, New York 10010 David S. Rosenblatt is a citizen of the United States of America. The 2012 David Rosenblatt Family Trust dated November 30, 2012 is formed under the laws of the State of New York. The 2024 Laura Thalheimer Rosenblatt Family Trust u/a/d April 1, 2024 is administered under the laws of the State of Delaware. Y The responses to questions 5 through 9 and 11 on the cover pages are incorporated by reference into this Item 4. David S. Rosenblatt has no voting or dispositive power over shares of Common Stock held by the 2012 David Rosenblatt Family Trust dated November 30, 2012 or the 2024 Laura Thalheimer Rosenblatt Family Trust effective April 1, 2024 (collectively, the "Trusts"). Mr Rosenblatt disclaims beneficial ownership of the shares of Common Stock held by the Trusts, except to the extent of his pecuniary interest therein. The filing of this Amendment No. 3 to Schedule 13G (this "Amendment") shall not be deemed an admission that Mr. Rosenblatt is, for purposes of Section 13(g) of the Securities Exchange Act of 1934, as amended, or otherwise, the beneficial owner of any equity securities held by the Trusts and covered by this Amendment. The responses to questions 5 through 9 and 11 on the cover pages are incorporated by reference into this Item 4. David S. Rosenblatt has no voting or dispositive power over shares of Common Stock held by the Trusts. Mr Rosenblatt disclaims beneficial ownership of the shares of Common Stock held by the Trusts, except to the extent of his pecuniary interest therein. The filing of this Amendment shall not be deemed an admission that Mr. Rosenblatt is, for purposes of Section 13(g) of the Securities Exchange Act of 1934, as amended, or otherwise, the beneficial owner of any equity securities held by the Trusts and covered by this Amendment. The responses to questions 5 through 9 and 11 on the cover pages are incorporated by reference into this Item 4. David S. Rosenblatt has no voting or dispositive power over shares of Common Stock held by the Trusts. 2012 David Rosenblatt Family Trust dated November 30, 2012 or the 2024 Laura Thalheimer Rosenblatt Family Trust effective April 1, 2024 (collectively, the "Trusts"). Mr Rosenblatt disclaims beneficial ownership of the shares of Common Stock held by the Trusts, except to the extent of his pecuniary interest therein. The filing of this Amendment shall not be deemed an admission that Mr. Rosenblatt is, for purposes of Section 13(g) of the Securities Exchange Act of 1934, as amended, or otherwise, the beneficial owner of any equity securities held by the Trusts and covered by this Amendment. The responses to questions 5 through 9 and 11 on the cover pages are incorporated by reference into this Item 4. David S. Rosenblatt has no voting or dispositive power over shares of Common Stock held by the Trusts. Mr Rosenblatt disclaims beneficial ownership of the shares of Common Stock held by the Trusts, except to the extent of his pecuniary interest therein. The filing of this Amendment shall not be deemed an admission that Mr. Rosenblatt is, for purposes of Section 13(g) of the Securities Exchange Act of 1934, as amended, or otherwise, the beneficial owner of any equity securities held by the Trusts and covered by this Amendment. The responses to questions 5 through 9 and 11 on the cover pages are incorporated by reference into this Item 4. David S. Rosenblatt has no voting or dispositive power over shares of Common Stock held by the Trusts. Mr Rosenblatt disclaims beneficial ownership of the shares of Common Stock held by the Trusts, except to the extent of his pecuniary interest therein. The filing of this Amendment shall not be deemed an admission that Mr. Rosenblatt is, for purposes of Section 13(g) of the Securities Exchange Act of 1934, as amended, or otherwise, the beneficial owner of any equity securities held by the Trusts and covered by this Amendment. The responses to questions 5 through 9 and 11 on the cover pages are incorporated by reference into this Item 4. David S. Rosenblatt has no voting or dispositive power over shares of Common Stock held by the Trusts. Mr Rosenblatt disclaims beneficial ownership of the shares of Common Stock held by the Trusts, except to the extent of his pecuniary interest therein. The filing of this Amendment shall not be deemed an admission that Mr. Rosenblatt is, for purposes of Section 13(g) of the Securities Exchange Act of 1934, as amended, or otherwise, the beneficial owner of any equity securities held by the Trusts and covered by this Amendment. Y N N Not applicable. N Not applicable. N Not applicable. N Not applicable. N David S. Rosenblatt David S. Rosenblatt David S. Rosenblatt 08/14/2025 Bessemer Trust Company of Delaware, N.A., as Trustee of the 2024 Laura Thalheimer Rosenblatt Family Trust u/a/d April 1, 2024 Bessemer Trust Company of Delaware, N.A., as Trustee of the 2024 Laura Thalheimer Rosenblatt Family Trust u/a/d April 1, 2024 By: Emily Nelson Its: Associate Vice President 08/14/2025 2012 David Rosenblatt Family Trust dated November 30, 2012 2012 David Rosenblatt Family Trust dated November 30, 2012 By: David Peltz Its: Trustee 08/14/2025