David S. Rosenblatt - 08 Sep 2025 Form 4 Insider Report for 1stdibs.com, Inc. (DIBS)

Role: Chief Executive Officer, Director
Signature: /s/ Melanie Goins, Attorney-In-Fact for David S. Rosenblatt
Issuer symbol: DIBS
Transactions as of: 08 Sep 2025
Net transactions value: -$204,980
Form type: 4
Filing time: 10 Sep 2025, 18:03:02 UTC
Previous filing: 02 Oct 2025
Next filing: 26 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
ROSENBLATT DAVID S	Chief Executive Officer, Director	300 PARK AVENUE SOUTH, 10TH FLOOR, NEW YORK	/s/ Melanie Goins, Attorney-In-Fact for David S. Rosenblatt	10 Sep 2025	0001237860

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	DIBS	Common Stock	Options Exercise		+37,500	+2.1%		1,824,105	08 Sep 2025	Direct	F1
transaction	DIBS	Common Stock	Options Exercise		+47,500	+2.6%		1,871,605	08 Sep 2025	Direct	F1
transaction	DIBS	Common Stock	Options Exercise		+47,500	+2.5%		1,919,105	08 Sep 2025	Direct	F1
transaction	DIBS	Common Stock	Sale	$204,980	-73,207	-3.8%	$2.80	1,845,898	08 Sep 2025	Direct	F2
holding	DIBS	Common Stock						22,500	08 Sep 2025	By 2024 Laura Thalheimer Rosenblatt Family Trust effective 4/1/2024
holding	DIBS	Common Stock						665,302	08 Sep 2025	By 2012 David Rosenblatt Family Trust dtd 11/30/2012

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	DIBS	Restricted Stock Units	Options Exercise	$0	-37,500	-14%	$0.000000	225,000	08 Sep 2025	Common Stock	37,500		Direct	F1, F3
transaction	DIBS	Restricted Stock Units	Options Exercise	$0	-47,500	-9.1%	$0.000000	475,000	08 Sep 2025	Common Stock	47,500		Direct	F1, F4
transaction	DIBS	Restricted Stock Units	Options Exercise	$0	-47,500	-6.7%	$0.000000	665,000	08 Sep 2025	Common Stock	47,500		Direct	F1, F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.
F2	These shares were retained by Issuer via settlement on a net withholding basis in order to meet the tax withholding obligations of the reporting person in connection with the vesting of an installment of restricted stock units ("RSUs") granted to the reporting person on March 15, 2023, March 8, 2024 and March 14, 2025. None of these shares were sold in an open market transaction.
F3	The initial number of restricted stock units granted shall vest in 16 equal quarterly installments starting on June 8, 2023, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.
F4	The initial number of restricted stock units granted shall vest in 16 equal quarterly installments starting on June 8, 2024, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.
F5	The initial number of restricted stock units granted shall vest in 16 equal quarterly installments starting on June 8, 2025, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.