1stdibs.com, Inc. — Director's Dealing 2025

Nov 27, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: 1stdibs.com, Inc. (DIBS)
CIK: 0001600641
Period of Report: 2025-11-24

Reporting Person: ROSENBLATT DAVID S (Director, Chief Executive Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-11-24	Common Stock	M	666666	$3.87	Acquired	2512564	Direct
2025-11-24	Common Stock	S	595071	$5.09	Disposed	1917493	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-11-24	Employee Stock Option (right to buy)	$3.87	M	666666	Disposed	2026-02-11	Common Stock (666666)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	22500	Indirect
Common Stock	665302	Indirect

Footnotes

F1: The transactions reported herein represent a net exercise of outstanding stock options. The reporting person received 666,666 shares of common stock on a net exercise of an option to purchase 666,666 shares of common stock. The Issuer withheld 595,071 shares of common stock underlying the option for payment of the aggregate exercise price of $2,579,997.42 and to meet the tax withholding obligations of the reporting person, using the stock price on November 24, 2025 of $5.09, pursuant to the terms of the 2011 Stock Option and Grant Plan.

F2: Option vests over four years with 1/48th of the shares vesting on each monthly anniversary of November 1, 2015, subject to the reporting person's continued service with the Issuer through the applicable vesting date.