David S. Rosenblatt - 09 Mar 2026 Form 4 Insider Report for 1stdibs.com, Inc. (DIBS)

Role
Chief Executive Officer, Director
Signature
/s/ Melanie Goins, Attorney-In-Fact for David S. Rosenblatt
Issuer symbol
DIBS
Transactions as of
09 Mar 2026
Net transactions value
$0
Form type
4
Filing time
11 Mar 2026, 20:05:24 UTC
Previous filing
10 Dec 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
ROSENBLATT DAVID S Chief Executive Officer, Director 300 PARK AVENUE SOUTH, 10TH FLOOR, NEW YORK /s/ Melanie Goins, Attorney-In-Fact for David S. Rosenblatt 11 Mar 2026 0001237860

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction DIBS Common Stock Options Exercise +37,500 +1.9% 2,014,286 09 Mar 2026 Direct F1
transaction DIBS Common Stock Options Exercise +47,500 +2.4% 2,061,786 09 Mar 2026 Direct F1
transaction DIBS Common Stock Options Exercise +47,500 +2.3% 2,109,286 09 Mar 2026 Direct F1
transaction DIBS Common Stock Tax liability -62,088 -2.9% $5.49* 2,047,198 09 Mar 2026 Direct F2
holding DIBS Common Stock 22,500 09 Mar 2026 By 2024 Laura Thalheimer Rosenblatt Family Trust effective 4/1/2024
holding DIBS Common Stock 665,302 09 Mar 2026 By 2012 David Rosenblatt Family Trust dtd 11/30/2012

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction DIBS Restricted Stock Units Options Exercise -37,500 -20% $0.000000* 150,000 09 Mar 2026 Common Stock 37,500 Direct F1, F3
transaction DIBS Restricted Stock Units Options Exercise -47,500 -11% $0.000000* 380,000 09 Mar 2026 Common Stock 47,500 Direct F1, F4
transaction DIBS Restricted Stock Units Options Exercise -47,500 -7.7% $0.000000* 570,000 09 Mar 2026 Common Stock 47,500 Direct F1, F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.
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, 2023, March 8, 2024 and March 14, 2025. None of these shares were sold in an open market transaction.
F3 The initial number of restricted stock units granted shall vest in 16 equal quarterly installments starting on June 8, 2023, provided the Reporting Person continues to have a service relationship with the Issuer at such time. The restricted stock units have no expiration date.
F4 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.
F5 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.