1stdibs (DIBS) CEO boosts stake via RSU vesting and tax withholding

Rhea-AI Filing Summary

1stdibs.com, Inc. Chief Executive Officer David S. Rosenblatt exercised restricted stock units into 132,500 shares of common stock on March 9, 2026. To satisfy tax obligations on these RSU vestings, 62,088 shares at $5.49 per share were withheld by the company rather than sold on the open market.

After these transactions, Rosenblatt directly owns 2,047,198 shares of common stock. Additional indirect holdings are reported through family trusts holding 22,500 and 665,302 shares, respectively.

Insights

Equity compensation analyst

CEO’s Form 4 shows routine RSU vesting with tax withholding, not open‑market trading.

The transactions reflect RSU vesting converting into 132,500 common shares for CEO David S. Rosenblatt. Code M entries are derivative exercises at a stated price of $0.0000, consistent with stock-based compensation rather than market purchases.

A Form 4 entry with code F shows 62,088 shares at $5.4900 withheld to cover tax liabilities on these vestings. Footnote language clarifies none of these shares were sold in open-market transactions, making this a mechanical tax event. Overall, Rosenblatt’s direct holdings increase to 2,047,198 shares, a routine compensation-driven change with neutral investment impact.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

ROSENBLATT DAVID S

(Last) (First) (Middle)

300 PARK AVENUE SOUTH

10TH FLOOR

(Street)

NEW YORK NY 10010

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
1stdibs.com, Inc. [ DIBS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/09/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/09/2026		M		37,500	A	(1)	2,014,286	D
Common Stock	03/09/2026		M		47,500	A	(1)	2,061,786	D
Common Stock	03/09/2026		M		47,500	A	(1)	2,109,286	D
Common Stock	03/09/2026		F		62,088	D	$5.49(2)	2,047,198	D
Common Stock								22,500	I	By 2024 Laura Thalheimer Rosenblatt Family Trust effective 4/1/2024
Common Stock								665,302	I	By 2012 David Rosenblatt Family Trust dtd 11/30/2012

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(1)	03/09/2026		M			37,500	(3)	(3)	Common Stock	37,500	$0	150,000	D
Restricted Stock Units	(1)	03/09/2026		M			47,500	(4)	(4)	Common Stock	47,500	$0	380,000	D
Restricted Stock Units	(1)	03/09/2026		M			47,500	(5)	(5)	Common Stock	47,500	$0	570,000	D

Explanation of Responses:

1. Each restricted stock unit represents a contingent right to receive one share of Issuer common stock.

2. 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.

3. 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.

4. 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.

5. 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.

Remarks:

	/s/ Melanie Goins, Attorney-In-Fact for David S. Rosenblatt	03/11/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What did 1stdibs (DIBS) CEO David Rosenblatt report in this Form 4?

David Rosenblatt reported RSU vesting that converted into 132,500 shares of common stock. These transactions are coded as derivative exercises, reflecting equity compensation rather than open‑market buying or selling, and increase his directly held stake in 1stdibs.com, Inc.

How many 1stdibs (DIBS) shares were withheld for David Rosenblatt’s taxes?

The filing shows 62,088 shares of common stock were withheld at $5.49 per share to satisfy tax obligations. Footnotes specify these shares were retained by the company and not sold in open‑market transactions, making this a routine tax‑withholding event.

How many 1stdibs (DIBS) shares does CEO David Rosenblatt own directly after these transactions?

Following the reported RSU exercises and tax withholding, David Rosenblatt directly owns 2,047,198 shares of 1stdibs.com, Inc. common stock. This total reflects his direct stake after converting restricted stock units and delivering shares to cover associated tax liabilities.

What do the RSU transactions in the 1stdibs (DIBS) Form 4 represent?

The RSU transactions represent restricted stock units converting into 132,500 common shares. Each RSU equals one share of common stock, and the exercises are part of scheduled vesting from grants made in March 2023, March 2024, and March 2025, according to the footnotes.

Were any of David Rosenblatt’s 1stdibs (DIBS) shares sold on the open market?

The Form 4 footnotes state that none of the 62,088 shares used for tax withholding were sold in open‑market transactions. Instead, these shares were retained by the issuer to meet Rosenblatt’s tax obligations related to the RSU vesting.

Does David Rosenblatt have indirect holdings in 1stdibs (DIBS) through family trusts?

Yes. The filing reports indirect ownership of 22,500 shares through the 2024 Laura Thalheimer Rosenblatt Family Trust and 665,302 shares through the 2012 David Rosenblatt Family Trust, in addition to his directly held 2,047,198 shares of common stock.