Changes in Beneficial Ownership · 4

1stdibs.com, Inc.

DIBSNASDAQEQUITYCurrent

Changes in Beneficial Ownership

Filed Sep 10, 2026Accepted Sep 10, 2026, 6:15 PM EDTFiling CIK 1600641Accession 0001336088-26-000009

wk-form4_1789078499.xml

Non-derivative transactions · 4 reported rows
Security	Transaction date	Code	Amount	A / D	Price (USD)	Owned after	Ownership
Common Stock	2026-09-08	M · Form 4	12,125	A	^[F1]	345,545	D
Common Stock	2026-09-08	M · Form 4	11,172	A	^[F1]	356,717	D
Common Stock	2026-09-08	M · Form 4	11,175	A	^[F1]	367,892	D
Common Stock	2026-09-08	F · Form 4	17,599	D	4.73^[F2]	350,293	D

Table key

M · Form 4: Exempt derivative exercise or conversion under Rule 16b-3
A: Acquired
D: Direct
F · Form 4: Securities delivered or withheld for exercise price or tax liability under Rule 16b-3

Derivative transactions · 3 reported rows
Security	Conversion / exercise price (USD)	Transaction date	Code	Amount	A / D	Exercisable	Expires	Underlying security	Underlying shares	Owned after	Ownership
Restricted Stock Units	^[F1]	2026-09-08	M · Form 4	12,125	D	^[F3]	^[F3]	Common Stock	12,125	121,250	D
Restricted Stock Units	^[F1]	2026-09-08	M · Form 4	11,172	D	^[F4]	^[F4]	Common Stock	11,172	111,719	D
Restricted Stock Units	^[F1]	2026-09-08	M · Form 4	11,175	D	^[F5]	^[F5]	Common Stock	11,175	67,050	D

Table key

F1: Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.↩ 1 ↩ 2 ↩ 3 ↩ 4 ↩ 5 ↩ 6
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, 2024, March 13, 2025, and March 13, 2026. None of these shares were sold in an open market transaction.↩ 1
F3: The initial number of restricted stock units granted shall vest in 12 equal quarterly installments starting on June 8, 2026, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.↩ 1 ↩ 2
F4: 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.↩ 1 ↩ 2
F5: 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.↩ 1 ↩ 2