1stdibs.com: United Refining reports about 7.8% stake

United Refining directly holds the reported position; four other reporting persons are also reported as beneficial owners through the ownership and management chain.

Rhea-AI Filing Summary

1stdibs.com, Inc. (DIBS) is the issuer in an amended beneficial-ownership report stating that United Refining, Inc. holds 2,635,385 shares, approximately 7.8% of the company’s outstanding shares. The percentage uses 33,615,293 shares outstanding as of July 31, 2026. United Acquisition Corp., Red Apple Group, Inc., John A. Catsimatidis Jr. (President and Chief Operating Officer of Red Apple Group), and John A. Catsimatidis (sole director, Chairman and Chief Executive Officer of Red Apple Group) are also reported as beneficial owners of the same block through their stated ownership and company roles.

United Refining purchased the shares in open-market transactions using working capital; the aggregate purchase price was approximately $13,216,097.15, including brokerage commissions. Its transactions during the past 60 days were effected in the open market through a broker.

Key Figures

Shares held by United Refining: 2,635,385 shares Ownership percentage: approximately 7.8% Shares outstanding: 33,615,293 shares +1 more

4 metrics

Shares held by United Refining 2,635,385 shares Reported beneficial-ownership position

Ownership percentage approximately 7.8% Based on shares outstanding as of July 31, 2026

Shares outstanding 33,615,293 shares As of July 31, 2026

Aggregate purchase price approximately $13,216,097.15 For the 2,635,385 shares, including brokerage commissions

Key Terms

beneficially own, sole power to vote, sole power to dispose, working capital, +1 more

5 terms

beneficially own regulatory

"may be deemed to beneficially own these 2,635,385 Shares"

Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.

sole power to vote regulatory

"has the sole power to vote or direct the vote of 2,635,385 Shares"

sole power to dispose regulatory

"has the sole power to dispose or direct the disposition of 2,635,385 Shares"

working capital financial

"purchased by United Refining with working capital"

Working capital is the money a business has available to cover its daily expenses, like paying bills and buying supplies. It’s like the cash in your wallet that helps you handle everyday costs; having enough ensures the business can operate smoothly without running into money shortages.

brokerage commissions financial

"including brokerage commissions"

Brokerage commissions are fees charged by a broker for executing buy or sell orders of stocks, bonds, or other securities on an investor’s behalf. Think of them as a service or ticket fee paid each time you use a broker to make a trade; they reduce your net returns and can influence how often you trade, so investors weigh their size and structure when deciding where and how actively to invest.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many shares do the DIBS reporting persons beneficially own?

United Refining holds 2,635,385 shares, reported as approximately 7.8% of outstanding shares. The same position is attributed to United Acquisition Corp., Red Apple Group, Inc., John A. Catsimatidis Jr., and John A. Catsimatidis.

Who has voting and disposition power over DIBS shares?

United Refining has sole power to vote or direct the vote of 2,635,385 shares and sole power to dispose or direct the disposition of the same number. United Acquisition, Red Apple Group, John A. Catsimatidis Jr., and John A. Catsimatidis are described as able to direct those powers through their stated ownership relationships and company roles.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/19/2026 - 05:00 PM EDT Accepted by SEC EDGAR 10/19/2026 - 05:00 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 1)

1stdibs.com, Inc.

(Name of Issuer)

Common Stock, par value $0.01 per share

(Title of Class of Securities)

320551104

(CUSIP Number)

Emily Pankow
800 Third Avenue, Fifth Floor
New York, NY, 10022
212.373.8422

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

10/15/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 320551104

1

Name of reporting person

John A. Catsimatidis Jr.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 2,635,385.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 2,635,385.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

2,635,385.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

7.8 %

14

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13D

CUSIP Number(s): 320551104

1

Name of reporting person

Red Apple Group, Inc.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 2,635,385.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 2,635,385.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

2,635,385.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

7.8 %

14

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13D

CUSIP Number(s): 320551104

1

Name of reporting person

United Acquisition Corp.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 2,635,385.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 2,635,385.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

2,635,385.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

7.8 %

14

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13D

CUSIP Number(s): 320551104

1

Name of reporting person

United Refining, Inc.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 2,635,385.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 2,635,385.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

2,635,385.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

7.8 %

14

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13D

CUSIP Number(s): 320551104

1

Name of reporting person

John A. Catsimatidis

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 2,635,385.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 2,635,385.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

2,635,385.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

7.8 %

14

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Stock, par value $0.01 per share
(b)	Name of Issuer: 1stdibs.com, Inc.
(c)	Address of Issuer's Principal Executive Offices: 300 Park Avenue South, 10th Floor, New York, NEW YORK , 10010.
Item 1 Comment: This Amendment No. 1 (this "Amendment") is being filed by John A. Catsimatidis Jr., United Refining, Inc. ("United Refining"), United Acquisition Corp. ("United Acquisition"), Red Apple Group, Inc. ("Red Apple Group") and John A. Catsimatidis (collectively, the "Reporting Persons") and amends and supplements the Schedule 13D filed with the Securities and Exchange Commission (the "SEC") by the Reporting Persons on November 21, 2025 (as amended, the "Schedule 13D") to reflect certain updates to the information previously reported. The Items below amend the information disclosed under the corresponding Items in the Schedule 13D as described below. Capitalized terms used but not defined in this Amendment shall have the same meanings ascribed to them in the Schedule 13D. Except as specifically provided herein, this Amendment does not modify any of the information previously reported in the Schedule 13D.
Item 3.	Source and Amount of Funds or Other Consideration
	Item 3 of the Schedule 13D is hereby amended and restated in its entirety as follows: The Shares beneficially owned by the Reporting Persons and held by United Refining were purchased by United Refining with working capital* in open market purchases. The aggregate purchase price of the 2,635,385 Shares beneficially owned by the Reporting Persons is approximately $13,216,097.15, including brokerage commissions. * Although United Refining is an operating company with a principal business concerning the refining and marketing of petroleum products, United Refining also regularly invests in securities and uses its cash flow and proceeds for such investment purpose.
Item 5.	Interest in Securities of the Issuer
(a)	Item 5(a) of the Schedule 13D is hereby amended and restated in its entirety as follows: The aggregate percentage of Shares reported beneficially owned by the Reporting Persons is calculated based on 33,615,293 Shares outstanding as of July 31, 2026, as disclosed in the Issuer's Quarterly Report on Form 10-Q for the period ended June 30, 2026, filed with the SEC on August 5, 2026. As of the date hereof, 2,635,385 Shares were held by United Refining. As a result, United Refining beneficially owns these 2,635,385 Shares, representing approximately 7.8% of the Shares outstanding. As of the date hereof, United Acquisition, as the sole owner of United Refining, may be deemed to beneficially own these 2,635,385 Shares, representing approximately 7.8% of the Shares outstanding. As of the date hereof, Red Apple Group, as the sole owner of United Acquisition, may be deemed to beneficially own these 2,635,385 Shares, representing approximately 7.8% of the Shares outstanding. As of the date hereof, Mr. Catsimatidis Jr., as the President and Chief Operating Officer of Red Apple Group, may be deemed to beneficially own these 2,635,385 Shares, representing approximately 7.8% of the Shares outstanding. As of the date hereof, Mr. Catsimatidis, as the sole director, Chairman and Chief Executive Officer of Red Apple Group, may be deemed to beneficially own these 2,635,385 Shares, representing approximately 7.8% of the Shares outstanding. Mr. Catsimatidis Jr. is also the President and Chief Operating Officer of United Acquisition and the President and Chief Operating Officer of United Refining, and may be deemed to beneficially own the Shares beneficially owned by each of United Acquisition and United Refining. Mr. Catsimatidis is also the sole director, Chairman and Chief Executive Officer of United Acquisition and the sole director, Chairman, Chief Executive Officer and Treasurer of United Refining, and may be deemed to beneficially own the Shares beneficially owned by each of United Acquisition and United Refining.
(b)	Item 5(b) of the Schedule 13D is hereby amended and restated in its entirety as follows: United Refining has the sole power to vote or direct the vote of 2,635,385 Shares. United Refining has the shared power to vote or direct the vote of 0 Shares. United Refining has the sole power to dispose or direct the disposition of 2,635,385 Shares. United Refining has the shared power to dispose or direct the disposition of 0 Shares. United Acquisition is the sole owner of United Refining. United Acquisition, solely in its capacity as the sole owner of United Refining, has the power to direct United Refining to vote or direct the vote of 2,635,385 Shares. United Acquisition has the shared power to vote or direct the vote of 0 Shares. United Acquisition, solely in its capacity as the sole owner of United Refining, has the power to direct United Refining to dispose or direct the disposition of 2,635,385 Shares. United Acquisition has the shared power to dispose or direct the disposition of 0 Shares. Red Apple Group is the sole owner of United Acquisition. Red Apple Group, solely in its capacity as the sole owner of United Acquisition, has the power to direct United Acquisition, solely in its capacity as the sole owner of United Refining, to direct United Refining to vote or direct the vote of 2,635,385 Shares. Red Apple Group has the shared power to vote or direct the vote of 0 Shares. Red Apple Group, solely in its capacity as the sole owner of United Acquisition, has the power to direct United Acquisition, solely in its capacity as the sole owner of United Refining, to direct United Refining to dispose or direct the disposition of 2,635,385 Shares. Red Apple Group has the shared power to dispose or direct the disposition of 0 Shares. Mr. Catsimatidis Jr. is the President and Chief Operating Officer of each of Red Apple Group, United Acquisition and United Refining. Mr. Catsimatidis Jr., solely in his capacity as the President and Chief Operating Officer of Red Apple Group, has the power to direct Red Apple Group, solely in its capacity as the sole owner of United Acquisition, to direct United Acquisition, solely in its capacity as the sole owner of United Refining, to direct United Refining to vote or direct the vote of 2,635,385 Shares. Mr. Catsimatidis Jr., solely in his capacity as the President and Chief Operating Officer of United Acquisition, has the power to direct United Acquisition, solely in its capacity as the sole owner of United Refining, to direct United Refining to vote or direct the vote of 2,635,385 Shares. Mr. Catsimatidis Jr., solely in his capacity as the President and Chief Operating Officer of United Refining, has the power to direct United Refining to vote or direct the vote of 2,635,385 Shares. Mr. Catsimatidis Jr. has the shared power to vote or direct the vote of 0 Shares. Mr. Catsimatidis Jr., solely in his capacity as the President and Chief Operating Officer of Red Apple Group, has the power to direct Red Apple Group, solely in its capacity as the sole owner of United Acquisition, to direct United Acquisition, solely in its capacity as the sole owner of United Refining, to direct United Refining to dispose or direct the disposition of 2,635,385 Shares. Mr. Catsimatidis Jr., solely in his capacity as the President and Chief Operating Officer of United Acquisition, has the power to direct United Acquisition, solely in its capacity as the sole owner of United Refining, to direct United Refining to dispose or direct the disposition of 2,635,385 Shares. Mr. Catsimatidis Jr., solely in his capacity as the President and Chief Operating Officer of United Refining, has the power to direct United Refining to dispose or direct the disposition of 2,635,385 Shares. Mr. Catsimatidis Jr. has the shared power to dispose or direct the disposition of 0 Shares. Mr. Catsimatidis is the sole director, Chairman and Chief Executive Officer of each of Red Apple Group and United Acquisition. Mr. Catsimatidis is the sole director, Chairman, Chief Executive Officer and Treasurer of United Refining. Mr. Catsimatidis, solely in his capacity as the sole director, Chairman and Chief Executive Officer of Red Apple Group, has the power to direct Red Apple Group, solely in its capacity as the sole owner of United Acquisition, to direct United Acquisition, solely in its capacity as the sole owner of United Refining, to direct United Refining to vote or direct the vote of 2,635,385 Shares. Mr. Catsimatidis, solely in his capacity as the sole director, Chairman and Chief Executive Officer of United Acquisition, has the power to direct United Acquisition, solely in its capacity as the sole owner of United Refining, to direct United Refining to vote or direct the vote of 2,635,385 Shares. Mr. Catsimatidis, solely in his capacity as the sole director, Chairman, Chief Executive Officer and Treasurer of United Refining, has the power to direct United Refining to vote or direct the vote of 2,635,385 Shares. Mr. Catsimatidis has the shared power to vote or direct the vote of 0 Shares. Mr. Catsimatidis, solely in his capacity as the sole director, Chairman and Chief Executive Officer of Red Apple Group, has the power to direct Red Apple Group, solely in its capacity as the sole owner of United Acquisition, to direct United Acquisition, solely in its capacity as the sole owner of United Refining, to direct United Refining to dispose or direct the disposition of 2,635,385 Shares. Mr. Catsimatidis, solely in his capacity as the sole director, Chairman and Chief Executive Officer of United Acquisition, has the power to direct United Acquisition, solely in its capacity as the sole owner of United Refining, to direct United Refining to dispose or direct the disposition of 2,635,385 Shares. Mr. Catsimatidis, solely in his capacity as the sole director, Chairman, Chief Executive Officer and Treasurer of United Refining, has the power to direct United Refining to dispose or direct the disposition of 2,635,385 Shares. Mr. Catsimatidis has the shared power to dispose or direct the disposition of 0 Shares.
(c)	Item 5(c) of the Schedule 13D is hereby amended and supplemented as follows: Each of United Acquisition, Red Apple Group and Messrs. Catsimatidis Jr. and Catsimatidis has not entered into any transactions during the past sixty (60) days. The transactions in the Shares by United Refining during the past sixty (60) days are set forth in Exhibit 99.1 and are incorporated herein by reference. All such transactions were effected in the open market through a broker.
Item 7.	Material to be Filed as Exhibits.
	99.1 - Transactions in Issuer Securities During the Past Sixty (60) Days.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

John A. Catsimatidis Jr.

Signature:	/s/ Emily Pankow
Name/Title:	Emily Pankow, Attorney-in-Fact for John A. Catsimatidis Jr.
Date:	10/19/2026

Red Apple Group, Inc.

Signature:	/s/ Emily Pankow
Name/Title:	Emily Pankow, Authorized Signatory
Date:	10/19/2026

United Acquisition Corp.

Signature:	/s/ Emily Pankow
Name/Title:	Emily Pankow, Authorized Signatory
Date:	10/19/2026

United Refining, Inc.

Signature:	/s/ Emily Pankow
Name/Title:	Emily Pankow, Authorized Signatory
Date:	10/19/2026

John A. Catsimatidis

Signature:	/s/ Emily Pankow
Name/Title:	Emily Pankow, Attorney-in-Fact for John A. Catsimatidis
Date:	10/19/2026