1stdibs.com (DIBS) CEO adds 47,500 shares in open-market trust purchases

Rhea-AI Filing Summary

1stdibs.com, Inc. Chief Executive Officer David S. Rosenblatt reported open-market share purchases through a family trust. On 2026-05-12, a trust for his benefit bought a total of 47,500 shares of 1stdibs.com common stock in three transactions at prices between $4.349 and $4.5105 per share, all classified as open-market purchases.

After these transactions, the 2012 David Rosenblatt Family Trust held 712,802 shares indirectly. Separate entries show 2,047,198 shares held directly and 22,500 shares held indirectly by the 2024 Laura Thalheimer Rosenblatt Family Trust, providing a view of his reported direct and indirect ownership positions.

Insights

Insider trading and governance analyst

CEO David Rosenblatt made a modest net open-market share purchase via a family trust.

CEO David S. Rosenblatt reported three open-market purchases totaling 47,500 shares of 1stdibs.com common stock on 2026-05-12 through the 2012 David Rosenblatt Family Trust. Purchase prices ranged from $4.349 to $4.5105 per share.

These are direct market buys rather than option exercises or tax withholdings, which usually carry stronger informational content. However, relative to his disclosed holdings of more than 2 million shares directly plus substantial indirect positions, the added 47,500 shares appear incremental.

The filing lists other indirect holdings via the 2024 Laura Thalheimer Rosenblatt Family Trust at 22,500 shares, and 2,047,198 shares held directly. Subsequent company filings may clarify any additional trading activity or changes in his overall ownership stake.

Insider Trade Summary

Net Buyer: 47,500 shares ($214,132)

Net Buy 5 txns

Insider ROSENBLATT DAVID S

Role Chief Executive Officer

Bought 47,500 shs ($214K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	43,755	$4.5105	$197K
Purchase	Common Stock	3,425	$4.4916	$15K
Purchase	Common Stock	320	$4.349	$1K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 709,057 shares (Indirect, By 2012 David Rosenblatt Family Trust dtd 11/30/2012); Common Stock — 2,047,198 shares (Direct, null)

Footnotes (1)

Key Figures

Total shares purchased: 47,500 shares Purchase price (trade 1): $4.349 per share Purchase price (trade 2): $4.4916 per share +4 more

7 metrics

Total shares purchased 47,500 shares Open-market buys on 2026-05-12

Purchase price (trade 1) $4.349 per share 320-share open-market purchase

Purchase price (trade 2) $4.4916 per share 3,425-share open-market purchase

Purchase price (trade 3) $4.5105 per share 43,755-share open-market purchase

Indirect trust holding 712,802 shares 2012 David Rosenblatt Family Trust after trades

Direct holding 2,047,198 shares Direct ownership after reported transactions

Other indirect holding 22,500 shares 2024 Laura Thalheimer Rosenblatt Family Trust

Key Terms

open-market purchase, indirect ownership, family trust, non-derivative, +1 more

5 terms

open-market purchase financial

"transaction_action":"open-market purchase""

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

indirect ownership financial

""ownership_type":"indirect","ownership_code":"I""

family trust financial

"By 2012 David Rosenblatt Family Trust dtd 11/30/2012"

non-derivative financial

""transaction_type":"non-derivative""

total_shares_following_transaction financial

""total_shares_following_transaction":"712802.0000""

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Form 4 Insider Transactions: What Each Field Means →

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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 NEW YORK 10010

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/12/2026

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

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

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

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								2,047,198	D
Common Stock								22,500	I	By 2024 Laura Thalheimer Rosenblatt Family Trust effective 4/1/2024
Common Stock	05/12/2026		P		43,755	A	$4.5105	709,057	I	By 2012 David Rosenblatt Family Trust dtd 11/30/2012
Common Stock	05/12/2026		P		3,425	A	$4.4916	712,482	I	By 2012 David Rosenblatt Family Trust dtd 11/30/2012
Common Stock	05/12/2026		P		320	A	$4.349	712,802	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

Explanation of Responses:

Remarks:

	/s/ Melanie Goins, Attorney-In-Fact for David S. Rosenblatt	05/13/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did 1stdibs.com (DIBS) CEO David Rosenblatt report?

David S. Rosenblatt reported three open-market purchases of 1stdibs.com common stock on 2026-05-12. These trades, executed through a family trust, totaled 47,500 shares at prices between $4.349 and $4.5105 per share.

How many 1stdibs.com (DIBS) shares did the Rosenblatt family trust buy and at what prices?

The 2012 David Rosenblatt Family Trust bought 47,500 shares of 1stdibs.com common stock. Purchases occurred at $4.349, $4.4916, and $4.5105 per share, all classified as open-market purchases on 2026-05-12.

What are David Rosenblatt’s indirect 1stdibs.com (DIBS) holdings after the Form 4 trades?

After the reported trades, the 2012 David Rosenblatt Family Trust held 712,802 shares of 1stdibs.com common stock. Another indirect position via the 2024 Laura Thalheimer Rosenblatt Family Trust held 22,500 shares, according to the filing’s ownership entries.

How many 1stdibs.com (DIBS) shares does David Rosenblatt hold directly after these transactions?

The Form 4 shows 2,047,198 shares of 1stdibs.com common stock held under direct ownership for David S. Rosenblatt. This direct position is reported separately from his indirect trust holdings in the same filing.

Were the 1stdibs.com (DIBS) CEO’s reported transactions option exercises or market buys?

The transactions were open-market purchases, coded “P” and described as purchases in the open market or private transactions. There were no derivative exercises reported, and derivativeSummary in the data shows no remaining derivative positions in this filing.

Does the Form 4 mention any Rule 10b5-1 trading plan for 1stdibs.com (DIBS) CEO trades?

The provided Form 4 data does not include any footnote language about a Rule 10b5-1 trading plan. The open-market purchases are reported without additional explanatory footnotes in the supplied excerpt.