SCHEDULE: 1stdibs.com Insider Rosenblatt Amends 10.4% Stake

David S. Rosenblatt and related trusts have filed an Amendment No. 4 to Schedule 13G, disclosing beneficial ownership of 10.4% of 1stdibs.com, Inc. common stock as of September 30, 2025.

Summary

• David S. Rosenblatt beneficially owns 4,017,563 shares of 1stdibs.com, Inc. common stock, representing 10.4% of the class, with sole voting and dispositive power over these shares.
• The 2012 David Rosenblatt Family Trust dated November 30, 2012, beneficially owns 665,302 shares, representing 1.8% of the class, with sole voting and dispositive power.
• The 2024 Laura Thalheimer Rosenblatt Family Trust u/a/d April 1, 2024, beneficially owns 22,500 shares, representing 0.1% of the class, with sole voting and dispositive power.
• Calculations for percentage of class are based on 36,246,609 shares of Common Stock outstanding as of September 30, 2025, as reported in the Issuer's Form 10-Q.
• Mr. Rosenblatt disclaims beneficial ownership of the shares held by the trusts, except to the extent of his pecuniary interest therein, and has no voting or dispositive power over those shares.

Sentiment

Score: 5

Explanation: The filing is a routine disclosure of beneficial ownership by an insider and related trusts, providing no specific positive or negative operational or financial information.

Future Outlook

NA

Industry Context

NA

Stakeholder Impact

• Shareholders: Provides transparency regarding significant insider and institutional ownership, which can influence investor confidence and perception of control.

Key Dates

Keywords

1stdibs.com, David S. Rosenblatt, Schedule 13G, beneficial ownership, common stock, insider ownership, institutional ownership, trust, SEC filing