Sim Acquisition Corp. I: 5%+ holders

As of November 10, 2026, one holder's latest Schedule 13D or 13G filing report owning 5% or more of Sim Acquisition Corp. I. The largest reported stake is SIM Sponsor 1 LLC's, at 93.2%. 16 filings are on record since August 6, 2025 (Schedule 13D, May 15, 2026).

Picton Mahoney Asset Management also filed stake reports on 20 other companies ↓

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Key facts

• Filing 2026-09-04 · Reporting person: Magnetar Financial LLC · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-09-04
• Filing 2026-08-14 · Reporting person: First Trust Merger Arbitrage Fund · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-08-14
• Filing 2026-08-12 · Reporting person: AQR Capital Management, LLC · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-08-12
• Filing 2026-08-11 · Reporting person: Picton Mahoney Asset Management · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-08-11
• Filing 2026-06-05 · Reporting person: Karpus Management, Inc. · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-06-05

Sim Acquisition Corp. I has 16 Schedule 13D or 13G filings on record since 2025-08-06. 1 holder's latest filing reports 5% or more of common stock, par value $0.0001. Each figure below is the holder's own, as filed, with the filing linked.

Holders

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More on Sim Acquisition Corp. I and the records around it.

Companies that share a holder

• Picton Mahoney Asset Management also filed stake reports on 20 other companies: Blue Water Acquisition Corp. III (Oct 2026), Launch One Acquisition Corp. (Oct 2026), Pono Capital Four, Inc. (Oct 2026)
• Westchester Capital Management, LLC also filed stake reports on 31 other companies: Lakeshore Acquisition III Corp. (Aug 2026), Sizzle Acquisition Corp. II (Aug 2026), Tavia Acquisition Corp. (Aug 2026)
• First Trust Merger Arbitrage Fund also filed stake reports on 47 other companies: TCW SPECIALTY LENDING LLC (Sep 2026), Blue Foundry Bancorp (Aug 2026), Centurion Acquisition Corp. (Aug 2026)

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What the Full Report on Sim Acquisition Corp. I covers

1. The Short Answer

2. Which Company This Is

3. What They Do, And How The Money Works

4. Who Runs It, And How To Reach Them

5. The Money: Funding, Valuation, Runway

6. Who Pays Them, And Who They Are Up Against

7. Warning Bells

8. Sources

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Voting and dispositive power, as filed

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The latest filing identifies Sim Acquisition Corp. I by CUSIP G8431T101 and gives its principal executive office as 725 Fifth Ave, 22nd Floor, New York, NY 10022 (SCHEDULE 13G/A, 2026-09-04).

Purpose of Transaction (Item 4)

SIM Sponsor 1 LLC

The responses to Items 3 and 6 of this Schedule 13D are incorporated by reference herein. The Reporting Persons hold their securities of the Issuer for investment purposes. The Reporting Persons continuously assess the Issuer's business, financial condition, results of operations and prospects, general economic conditions, other developments and additional investment opportunities. Depending on such assessments, and subject to any restrictions described herein (such as the transfer restrictions in the Letter Agreement dated July 9, 2024, which was entered into between the Issuer, the Sponsor and certain other parties (the "Letter Agreement")), the Reporting Persons may: (i) acquire beneficial ownership of additional securities of the Issuer in the open market, in privately negotiated transactions or otherwise; (ii) dispose of all or part of their holdings of securities of the Issuer; or (iii) take other actions which could involve one or more of the types of transactions or have one or more of the results described in Item 4 of Schedule 13D. Such actions will depend upon a variety of factors, including, without limitation, current and anticipated future trading prices, the financial condition, results of operations and prospects of the Issuer, alternative investment opportunities, general economic, financial market and industry conditions and other factors that the Reporting Persons may deem material to their investment decision. Except as set forth herein, the Reporting …The first part of Item 4 of the SCHEDULE 13D filed 2026-05-15; the filing has the rest

Timeline

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Questions about who owns Sim Acquisition Corp. I

Who owns Sim Acquisition Corp. I?

On this page, one holder's latest ownership filing reports 5% or more of Sim Acquisition Corp. I: SIM Sponsor 1 LLC (93.2%, Schedule 13D, filed 2026-05-15).

When did SIM Sponsor 1 LLC buy into Sim Acquisition Corp. I?

The filings give report dates, not purchase dates. The earliest filing from SIM Sponsor 1 LLC on this page is the Schedule 13G/A, filed 2026-02-19, reporting 24.7%; its latest, Schedule 13D filed 2026-05-15, reports 93.2%. 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%); 16 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.

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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.

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