OneIM Sponsor holds 20.3% stake in OneIM Acquisition Corp. (OIM) after IPO

Rhea-AI Filing Summary

OneIM Sponsor LLC reports beneficial ownership of 7,337,500 Class A ordinary shares (and Class B equivalents), representing 20.30% of the issuer's ordinary shares. The filing states this percentage is calculated based on 36,137,500 ordinary shares outstanding following the issuer's initial public offering, and the 7,337,500 total comprises 7,137,500 Class B shares plus 200,000 Class A shares included in Private Placement Units.

Insights

Corporate Governance Analyst

Stake report documents a sizable founding sponsor position of 20.30%.

The filing lists 7,337,500 shares beneficially owned by OneIM Sponsor LLC, combining Class B shares and Private Placement Units. The ownership calculation is explicitly tied to 36,137,500 shares outstanding after the IPO.

Holder actions and voting/dispositive powers are reported as sole for all disclosed shares; subsequent Form 13D or Forms 3/4 would show any active changes.

Key Figures

Beneficially owned: 7,337,500 shares Percent of class: 20.30% Shares outstanding: 36,137,500 shares +2 more

5 metrics

Beneficially owned 7,337,500 shares Amount beneficially owned reported on Schedule 13G

Percent of class 20.30% Percent of ordinary shares outstanding following IPO

Shares outstanding 36,137,500 shares Shares outstanding used to calculate percentage following IPO

Class B shares 7,137,500 shares Class B ordinary shares held directly by the Reporting Person

Private Placement Class A 200,000 shares Class A shares included in Private Placement Units held by Reporting Person

Key Terms

Schedule 13G, Private Placement Units, Class B ordinary shares

3 terms

Schedule 13G regulatory

"OneIM Sponsor LLC filing is labeled SCHEDULE 13G"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

Private Placement Units financial

"200,000 Class A ordinary shares included in Private Placement Units"

Class B ordinary shares financial

"7,137,500 Class B ordinary shares of OneIM Acquisition Corp."

Class B ordinary shares are a type of ownership stake in a company that typically come with different voting rights or privileges compared to other share classes. For investors, they represent a way to hold part of the company’s value and influence its decisions, often with fewer voting rights than Class A shares. Understanding these shares helps investors assess their level of control and potential returns within a company.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

OneIM Acquisition Corp.

(Name of Issuer)

Class A Ordinary Shares, $0.0001 par value per share

(Title of Class of Securities)

G6S74K106

(CUSIP Number)

01/13/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): G6S74K106

1

Names of Reporting Persons

OneIM Sponsor LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 7,337,500.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 7,337,500.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

7,337,500.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

20.30 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: (Rows 5, 7 and 9) Represents (i) 7,137,500 Class B ordinary shares of OneIM Acquisition Corp. (the "Issuer") held directly by OneIM Sponsor LLC (the "Reporting Person") and (ii) 200,000 Class A ordinary shares included in Private Placement Units held by the Reporting Person, for an aggregate of 7,337,500 shares. (Row 11) This percentage is calculated based on 36,137,500 ordinary shares outstanding following the completion of the Issuer's initial public offering, which includes 28,750,000 Class A ordinary shares issued in the offering and 7,187,500 Class B ordinary shares held by the initial shareholders, as well as 200,000 Class A ordinary shares included in the Private Placement Units.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: OneIM Acquisition Corp.
(b)	Address of issuer's principal executive offices: c/o OneIM Acquisition Corp., 11th Floor, 390 Park Avenue New York, New York 10022
Item 2.
(a)	Name of person filing: The person filing this statement is OneIM Sponsor LLC.
(b)	Address or principal business office or, if none, residence: c/o OneIM Acquisition Corp.11th Floor, 390 Park Avenue New York, New York 10022
(c)	Citizenship: OneIM Sponsor LLC is a Delaware limited liability company.
(d)	Title of class of securities: Class A Ordinary Shares, $0.0001 par value per share
(e)	CUSIP Number(s): G6S74K106
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 7,337,500
(b)	Percent of class: 20.30%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 7,337,500
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 7,337,500
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.	Certifications:
	Not Applicable

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.

OneIM Sponsor LLC

Signature:	/s/ Grigorios Kapenis
Name/Title:	Grigorios Kapenis, Authorized Person
Date:	04/15/2026

FAQ

What stake does OneIM Sponsor LLC hold in OneIM Acquisition Corp. (OIM)?

OneIM Sponsor LLC beneficially owns 7,337,500 ordinary shares, equal to 20.30% of outstanding shares. This total includes 7,137,500 Class B shares and 200,000 Class A in Private Placement Units.

How was the 20.30% ownership percentage for OIM calculated?

The percentage is calculated using 36,137,500 ordinary shares outstanding following the IPO. That base includes issued Class A shares, Class B shares held by initial shareholders, and Private Placement Units.

Does OneIM Sponsor LLC have voting and dispositive power over its shares?

Yes. The filing reports sole voting power of 7,337,500 shares and sole dispositive power of the same amount, with no shared voting or dispositive power listed.

Which share classes make up the Sponsor's reported holdings in OIM (symbol OIM)?

The reported holdings comprise 7,137,500 Class B ordinary shares held directly and 200,000 Class A ordinary shares included in Private Placement Units, totaling 7,337,500 shares.

When was the Schedule 13G signed for OneIM Sponsor LLC?

The Schedule 13G was signed by an authorized person, Grigorios Kapenis, on 04/15/2026, as indicated in the signature block of the filing.