GOINS MELANIE F (General Counsel and Secretary) sold 6.3% of their position (14.90K shares) of 1STDIBS.COM, INC. on the open market

Open‑market sale worth $82.0K — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 3 sales

GOINS MELANIE F

Filed: 3/11/2026ACC: 0001775877-26-000002

InsiderGOINS MELANIE FCIK 1775877

→

Issuer1STDIBS.COM, INC.CIK 1600641

Officer· General Counsel and Secretary

Since Jun 2021

-24.64K

Net shares

Net seller

$82.0K

Total sold

Open market trades

0B · 3S

Total transactions

33.20K acquired · 57.84K disposed

Non-Derivative Transactions8

Common Stock

Direct

M · Option Exercise

+5.33K

Price / share

—

Trade value

—

% of position

2.5%

3/9/2026

213.07K→218.40K

Common Stock

Direct

M · Option Exercise

+8.99K

Price / share

—

Trade value

—

% of position

4.1%

3/9/2026

218.40K→227.39K

Common Stock

Direct

M · Option Exercise

+10.04K

Price / share

—

Trade value

—

% of position

4.4%

3/9/2026

227.39K→237.43K

Common Stock

Direct

M · Option Exercise

+8.83K

Price / share

—

Trade value

—

% of position

3.7%

3/9/2026

237.43K→246.26K

Common Stock

Direct

F · Tax Withholding

−9.74K

Price / share

—

Trade value

—

% of position

4.0%

3/9/2026

246.26K→236.52K

Common Stock

Direct

S · Sale

−12.25K

Price / share

$5.50

Trade value

$67.36K

% of position

5.2%

3/9/2026

236.52K→224.27K

Common Stock

Direct

S · Sale

−2.62K

Price / share

$5.52

Trade value

$14.44K

% of position

1.2%

3/10/2026

224.27K→221.65K

Common Stock

Direct

S · Sale

−36.00

Price / share

$5.50

Trade value

$198.00

% of position

0.0%

3/11/2026

221.65K→221.62K

Total

Net shares

+8.55K

Net value

-$82K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	3/9/2026	M · Option Exercise	+5.33K	—	—	2.5%	213.07K	218.40K
Common Stock Direct	3/9/2026	M · Option Exercise	+8.99K	—	—	4.1%	218.40K	227.39K
Common Stock Direct	3/9/2026	M · Option Exercise	+10.04K	—	—	4.4%	227.39K	237.43K
Common Stock Direct	3/9/2026	M · Option Exercise	+8.83K	—	—	3.7%	237.43K	246.26K
Common Stock Direct	3/9/2026	F · Tax Withholding	−9.74K	—	—	4.0%	246.26K	236.52K
Common Stock Direct	3/9/2026	S · Sale	−12.25K	$5.50	$67.36K	5.2%	236.52K	224.27K
Common Stock Direct	3/10/2026	S · Sale	−2.62K	$5.52	$14.44K	1.2%	224.27K	221.65K
Common Stock Direct	3/11/2026	S · Sale	−36.00	$5.50	$198.00	0.0%	221.65K	221.62K
Total			+8.55K		-$82K

Derivative Transactions4

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

5.33K shares

−5.33K

Strike price

Held after

0.00

Exercisable

—

3/9/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

8.83K shares

−8.83K

Strike price

Held after

0.00

Exercisable

—

3/9/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

8.99K shares

−8.99K

Strike price

Held after

35.96K

Exercisable

—

3/9/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

10.04K shares

−10.04K

Strike price

Held after

80.33K

Exercisable

—

3/9/2026

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Restricted Stock Units Direct	Common Stock5.33K shares	3/9/2026	M · Option Exercise	−5.33K	—	0.00
Restricted Stock Units Direct	Common Stock8.83K shares	3/9/2026	M · Option Exercise	−8.83K	—	0.00
Restricted Stock Units Direct	Common Stock8.99K shares	3/9/2026	M · Option Exercise	−8.99K	—	35.96K
Restricted Stock Units Direct	Common Stock10.04K shares	3/9/2026	M · Option Exercise	−10.04K	—	80.33K