ROSENBLATT DAVID S (Chief Executive Officer) sold 23.7% of their position (595.07K shares) of 1STDIBS.COM, INC. on the open market

Open‑market sale worth $3.03M — a significant reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

ROSENBLATT DAVID S

Filed: 11/26/2025ACC: 0001237860-25-000007

InsiderROSENBLATT DAVID SCIK 1237860

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Issuer1STDIBS.COM, INC.CIK 1600641

DirectorOfficer· Chief Executive Officer

Since Jun 2021

-595.07K

Net shares

Net seller

$3.03M

Total sold

Open market trades

0B · 1S

Total transactions

666.67K acquired · 1.26M disposed

Non-Derivative Transactions2

Common Stock

Direct

M · Option Exercise

+666.67K

Price / share

$3.87

Trade value

$2.58M

% of position

36.1%

11/24/2025

1.85M→2.51M

Common Stock

Direct

S · Sale

−595.07K

Price / share

$5.09

Trade value

$3.03M

% of position

23.7%

11/24/2025

2.51M→1.92M

Total

Net shares

+71.59K

Net value

-$448.91K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	11/24/2025	M · Option Exercise	+666.67K	$3.87	$2.58M	36.1%	1.85M	2.51M
Common Stock Direct	11/24/2025	S · Sale	−595.07K	$5.09	$3.03M	23.7%	2.51M	1.92M
Total			+71.59K		-$448.91K

Derivative Transactions1

Employee Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Common Stock

666.67K shares

−666.67K

Strike price

3.87

Held after

0.00

Exercisable

—

11/24/2025

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Employee Stock Option (right to buy) Direct	Common Stock666.67K shares	11/24/2025	M · Option Exercise	−666.67K	3.87	—	0.00

Non-Derivative Holdings (Post-Transaction)2

Common Stock

Indirect

Shares owned22.50K

Common Stock

Indirect

Shares owned665.30K

Total

687.80K indirect687.80K

Security Title	Shares Owned	Ownership Type
Common Stock	22.50K	Indirect
Common Stock	665.30K	Indirect
Total	687.80K	687.80K indirect

Derivative Holdings (Post-Transaction)0

No derivative holdings reported