As of November 7, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of 1stdibs.com, Inc. The largest reported stake is David S. Rosenblatt's, at 10.5%. 9 filings are on record since August 14, 2025 (Schedule 13G/A, August 14, 2026).
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Key facts
- · Reporting person: John A. Catsimatidis Jr. · Sole voting: 2,635,385 · Shared voting: 0 · Sole dispositive: 2,635,385 · Shared dispositive: 0 · SCHEDULE 13D/A, 2026-10-19
- · Reporting person: David S. Rosenblatt · Sole voting: 3,701,802 · Shared voting: 0 · Sole dispositive: 3,701,802 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-08-14
- · Holder: David S. Rosenblatt · Percent: 9.8% · SCHEDULE 13G/A
- · Holder: David S. Rosenblatt · Percent: 9.3% · SCHEDULE 13G/A
- · Holder: Kanen Wealth Management LLC · Percent: 5.3% · SCHEDULE 13G
1stdibs.com, Inc. has 9 Schedule 13D or 13G filings on record since 2025-08-14. 3 holders' latest filing reports 5% or more of common stock, par value $0.01 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 10.5% | 3,701,802 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 | |
| 7.8% | 2,635,385 | SCHEDULE 13D/A, 2026-10-19 | 2026-10-15 | |
| Kanen Wealth Management LLC | 5.3% | 1,936,801 | SCHEDULE 13G, 2026-02-06 | 2026-02-02 |
| Sofina Capital S.A. | 0% | 0 | SCHEDULE 13G, 2026-01-15 | 2025-11-14 |
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More on 1stdibs.com, Inc. and the records around it.
1stdibs.com, Inc. elsewhere on the record
- Leadership changes Nov 2026
- Who owns it
Companies that share a holder
- Philotimo Fund, LP also filed stake reports on 9 other companies: Apyx Medical Corp (Oct 2026), Fossil Group, Inc. (Sep 2026), Allot Ltd. (Jun 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| David S. Rosenblatt | 3,701,802 | 0 | 3,701,802 | 0 | SCHEDULE 13G/A, 2026-08-14 |
| Bessemer Trust Company of Delaware, N.A., as Trustee of the 2024 Laura Thalheimer Rosenblatt Family Trust u/a/d April 1, 2024 | 22,500 | 0 | 22,500 | 0 | SCHEDULE 13G/A, 2026-08-14 |
| 2012 David Rosenblatt Family Trust dated November 30, 2012 | 712,802 | 0 | 712,802 | 0 | SCHEDULE 13G/A, 2026-08-14 |
| John A. Catsimatidis Jr. | 2,635,385 | 0 | 2,635,385 | 0 | SCHEDULE 13D/A, 2026-10-19 |
| Red Apple Group, Inc. | 2,635,385 | 0 | 2,635,385 | 0 | SCHEDULE 13D/A, 2026-10-19 |
| United Acquisition Corp. | 2,635,385 | 0 | 2,635,385 | 0 | SCHEDULE 13D/A, 2026-10-19 |
| United Refining, Inc. | 2,635,385 | 0 | 2,635,385 | 0 | SCHEDULE 13D/A, 2026-10-19 |
| John A. Catsimatidis | 2,635,385 | 0 | 2,635,385 | 0 | SCHEDULE 13D/A, 2026-10-19 |
The latest filing identifies 1stdibs.com, Inc. by CUSIP 320551104 and gives its principal executive office as 300 Park Avenue South, 10th Floor, New York, NY 10010 (SCHEDULE 13D/A, 2026-10-19).
What the percentages are based on
Calculations are based upon 33,615,293 shares of Common Stock of the Issuer outstanding as of September June 30, 2026, as set forth in the Form 10-Q of the Issuer filed with the U.S. Securities and Exchange Commission. The responses to questions 5 through 9 and 11 on the cover pages are incorporated by reference into this Item 4. David S.David S. Rosenblatt, SCHEDULE 13G/A, 2026-08-14
Source of funds (Item 3)
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.John A. Catsimatidis Jr., SCHEDULE 13D/A, 2026-10-19
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-14 | David S. Rosenblatt | 10.2% | SCHEDULE 13G/A |
| 2025-11-14 | David S. Rosenblatt | 10.4% | SCHEDULE 13G/A |
| 2025-11-21 | John A. Catsimatidis Jr. | 5.1% | SCHEDULE 13D |
| 2026-01-15 | Sofina Capital S.A. | 0% | SCHEDULE 13G |
| 2026-02-06 | Kanen Wealth Management LLC | 5.3% | SCHEDULE 13G |
| 2026-02-13 | David S. Rosenblatt | 9.3% | SCHEDULE 13G/A |
| 2026-05-15 | David S. Rosenblatt | 9.8% | SCHEDULE 13G/A |
| 2026-08-14 | David S. Rosenblatt | 10.5% | SCHEDULE 13G/A |
| 2026-10-19 | John A. Catsimatidis Jr. | 7.8% | SCHEDULE 13D/A |
Questions about who owns 1stdibs.com, Inc.
Who owns 1stdibs.com, Inc.?
On this page, 3 holders' latest ownership filings report 5% or more of 1stdibs.com, Inc.: David S. Rosenblatt (10.5%, Schedule 13G/A, filed 2026-08-14), John A. Catsimatidis Jr. (7.8%, Schedule 13D/A, filed 2026-10-19) and Kanen Wealth Management LLC (5.3%, Schedule 13G, filed 2026-02-06).
Who are the largest shareholders of 1stdibs.com, Inc.?
By the share each holder's latest filing reports, the largest holders of 1stdibs.com, Inc. on this page are David S. Rosenblatt (10.5%), John A. Catsimatidis Jr. (7.8%) and Kanen Wealth Management LLC (5.3%).
When did David S. Rosenblatt buy into 1stdibs.com, Inc.?
The filings give report dates, not purchase dates. The earliest filing from David S. Rosenblatt on this page is the Schedule 13G/A, filed 2025-08-14, reporting 10.2%; its latest, Schedule 13G/A filed 2026-08-14, reports 10.5%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 9 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for 1stdibs.com, Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| November 5, 2026 | Leadership change: David Rosenblatt departs, Chief Executive Officer, and 2 more | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.