SCHEDULE 13G

CUSIP Number(s):

G6S74K106

1

Names of Reporting Persons

RP Investment Advisors LP

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

ONTARIO, CANADA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,812,994.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,812,994.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,812,994.00

10

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

Checkbox not checked

11

Percent of class represented by amount in row (9)

6.3 %

12

Type of Reporting Person (See Instructions)

PN, IA, FI

Comment for Type of Reporting Person: Based upon 28,750,000 Class A ordinary shares outstanding, as reported by the Issuer in its current report on Form 10-Q filed with the Securities and Exchange Commission on May 11, 2026.

SCHEDULE 13G

CUSIP Number(s):

G6S74K106

1

Names of Reporting Persons

RP Select Opportunities Master Fund Ltd.

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

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 875,762.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 875,762.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

875,762.00

10

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

Checkbox not checked

11

Percent of class represented by amount in row (9)

3.1 %

12

Type of Reporting Person (See Instructions)

FI

Comment for Type of Reporting Person: Based upon 28,750,000 Class A ordinary shares outstanding, as reported by the Issuer in its current report on Form 10-Q filed with the Securities and Exchange Commission on May 11, 2026.

SCHEDULE 13G

CUSIP Number(s):

G6S74K106

1

Names of Reporting Persons

RP Debt Opportunities Fund Ltd.

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

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 271,119.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 271,119.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

271,119.00

10

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

Checkbox not checked

11

Percent of class represented by amount in row (9)

0.9 %

12

Type of Reporting Person (See Instructions)

FI

Comment for Type of Reporting Person: Based upon 28,750,000 Class A ordinary shares outstanding, as reported by the Issuer in its current report on Form 10-Q filed with the Securities and Exchange Commission on May 11, 2026.

SCHEDULE 13G

CUSIP Number(s):

G6S74K106

1

Names of Reporting Persons

RP Alternative Global Bond Fund

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

ONTARIO, CANADA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 538,478.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 538,478.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

538,478.00

10

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

Checkbox not checked

11

Percent of class represented by amount in row (9)

1.9 %

12

Type of Reporting Person (See Instructions)

FI

Comment for Type of Reporting Person: Based upon 28,750,000 Class A ordinary shares outstanding, as reported by the Issuer in its current report on Form 10-Q filed with the Securities and Exchange Commission on May 11, 2026.

SCHEDULE 13G

CUSIP Number(s):

G6S74K106

1

Names of Reporting Persons

RP Alternative Credit Opportunities Fund

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

ONTARIO, CANADA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 127,635.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 127,635.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

127,635.00

10

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

Checkbox not checked

11

Percent of class represented by amount in row (9)

3.4 %

12

Type of Reporting Person (See Instructions)

FI

Comment for Type of Reporting Person: Based upon 28,750,000 Class A ordinary shares outstanding, as reported by the Issuer in its current report on Form 10-Q filed with the Securities and Exchange Commission on May 11, 2026.

SCHEDULE 13G

Item 1.

(a)

Name of issuer:

OneIM Acquisition Corp.

(b)

Address of issuer's principal executive offices:

390 PARK AVE., 11TH FLOOR, NEW YORK, NEW YORK, 10022

Item 2.

(a)

Name of person filing:

This statement is jointly filed by and on behalf of each of RP Investment Advisors LP, RP Select Opportunities Master Fund Ltd., RP Debt Opportunities Fund Ltd., RP Alternative Global Bond Fund and RP Alternative Credit Opportunities Fund (the "Funds"). RP Select Opportunities Master Fund Ltd., RP Debt Opportunities Fund Ltd., RP Alternative Global Bond Fund and RP Alternative Credit Opportunities Fund (the "Funds") are the record and direct beneficial owners of the securities covered by this statement. RP Investment Advisors LP is the investment advisor of, and may be deemed to beneficially own securities owned by, the Funds. Each reporting person declares that neither the filing of this statement nor anything herein shall be construed as an admission that such person is for the purposes of Section 13(d) or 13(g) of the Act or any other purpose, the beneficial owner of any securities covered by this statement. Each of the reporting persons may be deemed to be a member of a group with respect to the Issuer or securities of the Issuer for the purposes of Section 13(d) or 13(g) of the Act. Each of the reporting persons declares that neither the filing of this statement nor anything herein shall be contrued as an admission that such person is, for the purposes of Section 13(d) or 13(g) of the Act or any other purpose, (i) acting (or has agreed or is agreeing to act together with any other person) as a partnership, syndicate, or other group for the purpose of acquiring, holding, or disposing of securities of the Issuer or otherwise with respect to the Issuer or any securities of the Issuer or (ii) a member of any group with respect to the Issuer or any securities of the Issuer.

(b)

Address or principal business office or, if none, residence:

The address of the principal business office of each of the reporting persons is 39 Hazelton Avenue, Toronto, Ontario, Canada, M5R 2E3.

(c)

Citizenship:

See Item 4 on the cover page(s) hereto.

(d)

Title of class of securities:

Class A ordinary shares

(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:

See Item 9 on the cover page(s) hereto.

(b)

Percent of class:

See Item 11 on the cover page(s) hereto.

(c)

Number of shares as to which the person has:

(i) Sole power to vote or to direct the vote:

See Item 5 on the cover page(s) hereto.

(ii) Shared power to vote or to direct the vote:

See Item 6 on the cover page(s) hereto.

(iii) Sole power to dispose or to direct the disposition of:

See Item 7 on the cover page(s) hereto.

(iv) Shared power to dispose or to direct the disposition of:

See Item 8 on the cover page(s) hereto.

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:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

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.

RP Investment Advisors LP

Signature:	/s/ Richard Pilosof
Name/Title:	Richard Pilosof, Chief Executive Officer, RP Investment Advisors LP by its General Partner RP Investment Advisors GP Inc
Date:	06/18/2026

RP Select Opportunities Master Fund Ltd.

Signature:	/s/ Richard Pilosof
Name/Title:	Richard Pilosof, Chief Executive Officer, RP Investment Advisors LP by its General Partner RP Investment Advisors GP Inc
Date:	06/18/2026

RP Debt Opportunities Fund Ltd.

Signature:	/s/ Richard Pilosof
Name/Title:	Richard Pilosof, Chief Executive Officer, RP Investment Advisors LP by its General Partner RP Investment Advisors GP Inc.
Date:	06/18/2026

RP Alternative Global Bond Fund

Signature:	/s/ Richard Pilosof
Name/Title:	Richard Pilosof, Chief Executive Officer, RP Investment Advisors LP by its General Partner RP Investment Advisors GP Inc.
Date:	06/18/2026

RP Alternative Credit Opportunities Fund

Signature:	/s/ Richard Pilosof
Name/Title:	Richard Pilosof, Chief Executive Officer, RP Investment Advisors LP by its General Partner RP Investment Advisors GP Inc.
Date:	06/18/2026

Exhibit Information

Exhibit 99.1 Joint Filing Agreement (filed herewith).

SEC Form SCHEDULE 13G filed by OneIM Acquisition Corp.