Illumination Acquisition Corp. I: 5%+ holders

As of November 6, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of Illumination Acquisition Corp. I. The largest reported stake is Illumination Acquisition 1 Sponsor LLC's, at 25.7%. 3 filings are on record since March 5, 2026 (Schedule 13D, March 5, 2026).

MAGNETAR FINANCIAL LLC also filed stake reports on 97 other companies ↓

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Key facts

• Filing 2026-08-13 · Reporting person: Magnetar Financial LLC · Sole voting: 0 · Shared voting: 1,849,995 · Sole dispositive: 0 · Shared dispositive: 1,849,995 · SCHEDULE 13G/A, 2026-08-13
• Filed 2026-05-13 · Holder: Magnetar Financial LLC · Percent: 5.91% · SCHEDULE 13G
• Filed 2026-03-05 · Holder: Illumination Acquisition 1 Sponsor LLC · Percent: 25.7% · SCHEDULE 13D

Illumination Acquisition Corp. I has 3 Schedule 13D or 13G filings on record since 2026-03-05. 2 holders' latest filing reports 5% or more of class a ordinary shares, 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 Illumination Acquisition Corp. I and the records around it.

Companies that share a holder

• MAGNETAR FINANCIAL LLC also filed stake reports on 97 other companies: Blue Acquisition Corp. (Sep 2026), CENTURION ACQUISITION CORP. (Sep 2026), Churchill Capital Corp IX (Sep 2026)

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What the Full Report on Illumination Acquisition Corp. I covers

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4. Who Runs It, And How To Reach Them

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Voting and dispositive power, as filed

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The latest filing identifies Illumination Acquisition Corp. I by CUSIP G470AU100 and gives its principal executive office as 570 LEXINGTON AVENUE), 40TH FLOOR, New York, NY 10022 (SCHEDULE 13G/A, 2026-08-13).

What the percentages are based on

As of June 30, 2026, each of the Reporting Persons were deemed to be the beneficial owner constituting approximately 7.83% of the total number of shares outstanding (based upon the information provided by the Issuer in the Form 10-Q filed on July 15, 2026 there were approximately 23,625,000 Shares outstanding).Magnetar Financial LLC, SCHEDULE 13G/A, 2026-08-13

Purpose of Transaction (Item 4)

Illumination Acquisition 1 Sponsor LLC

November 21, 2025, Sponsor, as sponsor of the Issuer, acquired an aggregate of7,666,667 ordinary shares for an aggregate purchase price of $25,000, or approximately $0.003 per share. On February 26, 2026, the Issuer consummated its initial public offering ("IPO") and in connection with the consummation, the Sponsor purchased an aggregate of 365,000 units for an aggregate purchase price of $3,650,000. Each unit purchased was comprised of one Class A ordinary share of the Issuer and one-third of one redeemable warrant of the Issuer, with each whole warrant exercisable to purchase one Class A ordinary share upon consummation of an initial business combination. The reporting persons made the acquisitions reported in this Schedule 13D as sponsor, officers and directors of the Issuer and in support of the Issuer's business plan. The reporting persons may acquire or dispose of additional securities or sell securities of the Issuer from time to time in the market or in private transactions, including as a result of ownership of the warrants referred to above. However, reporting persons do not have any other agreements to acquire additional Class A ordinary shares at this time. As officers and directors of the Issuer, Lipman and Rosenberg are involved in making material business decisions regarding the Issuer's policies and practices and may be involved in the consideration of various proposals considered by the Issuer's board of directors. Additionally, as the Issuer's business …The first part of Item 4 of the SCHEDULE 13D filed 2026-03-05; the filing has the rest

Timeline

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Questions about who owns Illumination Acquisition Corp. I

Who owns Illumination Acquisition Corp. I?

On this page, 2 holders' latest ownership filings report 5% or more of Illumination Acquisition Corp. I: Illumination Acquisition 1 Sponsor LLC (25.7%, Schedule 13D, filed 2026-03-05) and Magnetar Financial LLC (7.83%, Schedule 13G/A, filed 2026-08-13).

Who are the largest shareholders of Illumination Acquisition Corp. I?

By the share each holder's latest filing reports, the largest holders of Illumination Acquisition Corp. I on this page are Illumination Acquisition 1 Sponsor LLC (25.7%) and Magnetar Financial LLC (7.83%).

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

The filings give report dates, not purchase dates. The earliest filing from Illumination Acquisition 1 Sponsor LLC on this page is the Schedule 13D, filed 2026-03-05, reporting 25.7%.

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%); 3 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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