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: 9/10/2026ACC: 0001237860-26-000018

InsiderROSENBLATT DAVID SCIK 1237860

→

Issuer1STDIBS.COM, INC.CIK 1600641

DirectorOfficer· Chief Executive Officer

Since Jun 2021

-96.23K

Net shares

Net seller

$455.2K

Total sold

0

Open market trades

0B · 0S

9

Total transactions

174.17K acquired · 270.40K disposed

Non-Derivative Transactions5

Common Stock

Direct

M · Option Exercise

Shares

+37.50K

Price / share

—

Trade value

—

% of position

1.8%

9/8/2026

2.13M→2.16M

Common Stock

Direct

M · Option Exercise

Shares

+47.50K

Price / share

—

Trade value

—

% of position

2.2%

9/8/2026

2.16M→2.21M

Common Stock

Direct

M · Option Exercise

Shares

+47.50K

Price / share

—

Trade value

—

% of position

2.1%

9/8/2026

2.21M→2.26M

Common Stock

Direct

M · Option Exercise

Shares

+41.67K

Price / share

—

Trade value

—

% of position

1.8%

9/8/2026

2.26M→2.30M

Common Stock

Direct

F · Tax Withholding

Shares

−96.23K

Price / share

$4.73

Trade value

$455.16K

% of position

4.2%

9/8/2026

2.30M→2.20M

Total

Net shares

+77.94K

Net value

-$455.16K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	9/8/2026	M · Option Exercise	+37.50K	—	—	1.8%	2.13M	2.16M
Common Stock Direct	9/8/2026	M · Option Exercise	+47.50K	—	—	2.2%	2.16M	2.21M
Common Stock Direct	9/8/2026	M · Option Exercise	+47.50K	—	—	2.1%	2.21M	2.26M
Common Stock Direct	9/8/2026	M · Option Exercise	+41.67K	—	—	1.8%	2.26M	2.30M
Common Stock Direct	9/8/2026	F · Tax Withholding	−96.23K	$4.73	$455.16K	4.2%	2.30M	2.20M
Total			+77.94K		-$455.16K

Derivative Transactions4

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

37.50K shares

Shares

−37.50K

Strike price

Held after

75K

Exercisable

—

9/8/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

47.50K shares

Shares

−47.50K

Strike price

Held after

285K

Exercisable

—

9/8/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

47.50K shares

Shares

−47.50K

Strike price

Held after

475K

Exercisable

—

9/8/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

41.67K shares

Shares

−41.67K

Strike price

Held after

416.67K

Exercisable

—

9/8/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Restricted Stock Units Direct	Common Stock37.50K shares	9/8/2026	M · Option Exercise	−37.50K		—	75K
Restricted Stock Units Direct	Common Stock47.50K shares	9/8/2026	M · Option Exercise	−47.50K		—	285K
Restricted Stock Units Direct	Common Stock47.50K shares	9/8/2026	M · Option Exercise	−47.50K		—	475K
Restricted Stock Units Direct	Common Stock41.67K shares	9/8/2026	M · Option Exercise	−41.67K		—	416.67K

Non-Derivative Holdings (Post-Transaction)2

Common Stock

Indirect

Shares owned22.50K

Common Stock

Indirect

Shares owned712.80K

Total

735.30K indirect735.30K

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

Derivative Holdings (Post-Transaction)0

No derivative holdings reported

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