ROSENBLATT DAVID S

PrivateCIK: 1237860

Location

NEW YORK, NY

ROSENBLATT DAVID S (Chief Executive Officer) exercised options at 1STDIBS.COM, INC.

Option exercise — a mechanical event triggered by vesting or expiry. Not a discretionary conviction trade.

M · 4 exercises

ROSENBLATT DAVID S

Filed: 6/10/2026ACC: 0001237860-26-000012

InsiderROSENBLATT DAVID SCIK 1237860

→

Issuer1STDIBS.COM, INC.CIK 1600641

DirectorOfficer· Chief Executive Officer

Since Jun 2021

-96.23K

Net shares

Net seller

$385.9K

Total sold

0

Open market trades

0B · 0S

9

Total transactions

174.17K acquired · 270.39K disposed

Non-Derivative Transactions5

Common Stock

Direct

M · Option Exercise

Shares

+47.50K

Price / share

—

Trade value

—

% of position

2.3%

6/8/2026

2.05M→2.09M

Common Stock

Direct

M · Option Exercise

Shares

+47.50K

Price / share

—

Trade value

—

% of position

2.3%

6/8/2026

2.09M→2.14M

Common Stock

Direct

M · Option Exercise

Shares

+41.67K

Price / share

—

Trade value

—

% of position

1.9%

6/8/2026

2.14M→2.18M

Common Stock

Direct

M · Option Exercise

Shares

+37.50K

Price / share

—

Trade value

—

% of position

1.7%

6/8/2026

2.18M→2.22M

Common Stock

Direct

F · Tax Withholding

Shares

−96.23K

Price / share

$4.01

Trade value

$385.87K

% of position

4.3%

6/8/2026

2.22M→2.13M

Total

Net shares

+77.94K

Net value

-$385.87K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	6/8/2026	M · Option Exercise	+47.50K	—	—	2.3%	2.05M	2.09M
Common Stock Direct	6/8/2026	M · Option Exercise	+47.50K	—	—	2.3%	2.09M	2.14M
Common Stock Direct	6/8/2026	M · Option Exercise	+41.67K	—	—	1.9%	2.14M	2.18M
Common Stock Direct	6/8/2026	M · Option Exercise	+37.50K	—	—	1.7%	2.18M	2.22M
Common Stock Direct	6/8/2026	F · Tax Withholding	−96.23K	$4.01	$385.87K	4.3%	2.22M	2.13M
Total			+77.94K		-$385.87K

Derivative Transactions4

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

47.50K shares

Shares

−47.50K

Strike price

Held after

332.50K

Exercisable

—

6/8/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

47.50K shares

Shares

−47.50K

Strike price

Held after

522.50K

Exercisable

—

6/8/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

41.67K shares

Shares

−41.67K

Strike price

Held after

458.33K

Exercisable

—

6/8/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

37.50K shares

Shares

−37.50K

Strike price

Held after

112.50K

Exercisable

—

6/8/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Restricted Stock Units Direct	Common Stock47.50K shares	6/8/2026	M · Option Exercise	−47.50K		—	332.50K
Restricted Stock Units Direct	Common Stock47.50K shares	6/8/2026	M · Option Exercise	−47.50K		—	522.50K
Restricted Stock Units Direct	Common Stock41.67K shares	6/8/2026	M · Option Exercise	−41.67K		—	458.33K
Restricted Stock Units Direct	Common Stock37.50K shares	6/8/2026	M · Option Exercise	−37.50K		—	112.50K

Non-Derivative Holdings (Post-Transaction)2

Common Stock

Indirect

Shares owned712.80K

Common Stock

Indirect

Shares owned22.50K

Total

735.30K indirect735.30K

Security Title	Shares Owned	Ownership Type
Common Stock	712.80K	Indirect
Common Stock	22.50K	Indirect
Total	735.30K	735.30K indirect

Derivative Holdings (Post-Transaction)0

No derivative holdings reported

ROSENBLATT DAVID S — Insider Transaction (Form 4) Filed Jun 10, 2026 | Finecho