Insider Transaction Report

Thomas J Etergino, Chief Financial Officer of 1stdibs.com, Inc., acquired 145,500 Restricted Stock Units (RSUs) on March 13, 2026. These RSUs represent a contingent right to receive one share of the company's common stock. The grant vests in 12 equal quarterly installments starting June 8, 2026, contingent upon continued service with the company. The RSUs have no expiration date and were acquired at a price of $0.0 per share. Following the transaction, Mr. Etergino holds 145,500 shares of common stock underlying these RSUs.