RP Investment Advisors reports 5.4% stake in KPET

Rhea-AI Filing Summary

RP Investment Advisors and affiliated funds filed a joint Schedule 13G reporting shared beneficial ownership of Class A ordinary shares of KPET Ultra Paceline Corp. The cover shows combined shared dispositive and voting positions held across five funds, including 1,250,000 shares (5.4%) by RP Investment Advisors (via funds) and other fund positions of 760,125 shares (3.3%), 281,125 shares (1.2%), 148,125 shares (0.6%), and 60,625 shares (0.3%). The percentages are calculated “based upon 23,000,000 Class A ordinary shares outstanding following the issuer’s IPO,” as cited in the filing.

Insights

Institutional Ownership Analyst

Joint filing reports passive, shared holdings across RP-managed funds totaling multiple mid-six-figure stakes.

The Schedule 13G lists specific holdings by each RP fund with percentage stakes tied to an explicit 23,000,000 shares outstanding post-IPO. The filing emphasizes shared dispositive/voting power rather than sole control.

Future disclosures in periodic filings may update positions; this filing frames the current passive ownership snapshot and identifies the reporting group.

SEC Compliance Specialist

Filing uses standard Schedule 13G language and includes a joint filing agreement and customary Section 13(g) disclaimers.

The cover pages attribute shared power figures and include the statutory caveats that the reporting persons do not admit beneficial ownership for Section 13(d)/(g) purposes. The signature block is provided by the adviser’s CEO.

Items to watch in subsequent filings: any change to percent ownership or conversion from passive (13G) to active (13D) status if the group’s intent or holdings change.

Key Figures

Shares outstanding: 23,000,000 shares RP Investment Advisors position: 1,250,000 shares RP Select Opportunities position: 760,125 shares +3 more

6 metrics

Shares outstanding 23,000,000 shares post-IPO outstanding as cited in filing

RP Investment Advisors position 1,250,000 shares shared dispositive/voting power, <date>05/11/2026</date>

RP Select Opportunities position 760,125 shares shared dispositive/voting power, based on 23,000,000 shares outstanding

RP Alternative Global Bond Fund position 281,125 shares shared dispositive/voting power, based on 23,000,000 shares outstanding

RP Debt Opportunities position 148,125 shares shared dispositive/voting power, based on 23,000,000 shares outstanding

RP Alternative Credit Opportunities position 60,625 shares shared dispositive/voting power, based on 23,000,000 shares outstanding

Key Terms

beneficially owned, shared dispositive power, Section 13(d) or 13(g)

3 terms

beneficially owned regulatory

"Amount beneficially owned: See Item 9 on the cover page(s) hereto."

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared dispositive power regulatory

"Shared Dispositive Power 1,250,000.00"

Section 13(d) or 13(g) regulatory

"neither the filing of this statement nor anything herein shall be construed as an admission ... Section 13(d) or 13(g) of the Act"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake does RP Investment Advisors report in KPET (KPET)?

RP Investment Advisors reports shared beneficial ownership of 1,250,000 shares (5.4%) of KPET Class A ordinary shares, based on 23,000,000 shares outstanding after the issuer's IPO, per the filing.

Which RP funds are named in the joint Schedule 13G for KPET?

The joint filing lists 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 as reporting persons.

How were the percentage ownership figures for KPET calculated?

Percentages are stated as calculated “based upon 23,000,000 Class A ordinary shares outstanding following the IPO,” as cited in the Schedule 13G cover page comments in the filing.

Does the Schedule 13G indicate RP is acting as an activist group in KPET?

No. The filing includes standard disclaimers that the reporting persons do not admit they are acting as a group under Section 13(d) or 13(g) and reports the positions as passive under Schedule 13G language.

Who signed the Schedule 13G for the RP reporting group?

The Schedule 13G is signed on behalf of the reporting group by Richard Pilosof, Chief Executive Officer of RP Investment Advisors LP (by its general partner), with signature dates of 05/13/2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/13/2026 - 03:26 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

KPET Ultra Paceline Corp

(Name of Issuer)

Class A ordinary shares

(Title of Class of Securities)

G53157122

(CUSIP Number)

05/11/2026

(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): G53157122

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 1,250,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,250,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,250,000.00

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)

5.4 %

12

Type of Reporting Person (See Instructions)

PN, IA, FI

Comment for Type of Reporting Person: Based upon 23,000,000 Class A ordinary shares outstanding following the issuance made pursuant to the initial public offering of the Issuer's units, as reported by the Issuer in its current report on Form 8-K filed with the Securities and Exchange Commission on April 22, 2026.

SCHEDULE 13G

CUSIP Number(s): G53157122

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 760,125.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 760,125.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

760,125.00

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)

3.3 %

12

Type of Reporting Person (See Instructions)

FI

Comment for Type of Reporting Person: Based upon 23,000,000 Class A ordinary shares outstanding following the issuance made pursuant to the initial public offering of the Issuer's units, as reported by the Issuer in its current report on Form 8-K filed with the Securities and Exchange Commission on April 22, 2026.

SCHEDULE 13G

CUSIP Number(s): G53157122

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 148,125.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 148,125.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

148,125.00

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)

0.6 %

12

Type of Reporting Person (See Instructions)

FI

Comment for Type of Reporting Person: Based upon 23,000,000 Class A ordinary shares outstanding following the issuance made pursuant to the initial public offering of the Issuer's units, as reported by the Issuer in its current report on Form 8-K filed with the Securities and Exchange Commission on April 22, 2026.

SCHEDULE 13G

CUSIP Number(s): G53157122

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 281,125.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 281,125.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

281,125.00

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)

1.2 %

12

Type of Reporting Person (See Instructions)

FI

Comment for Type of Reporting Person: Based upon 23,000,000 Class A ordinary shares outstanding following the issuance made pursuant to the initial public offering of the Issuer's units, as reported by the Issuer in its current report on Form 8-K filed with the Securities and Exchange Commission on April 22, 2026.

SCHEDULE 13G

CUSIP Number(s): G53157122

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 60,625.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 60,625.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

60,625.00

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)

0.3 %

12

Type of Reporting Person (See Instructions)

FI

Comment for Type of Reporting Person: Based upon 23,000,000 Class A ordinary shares outstanding following the issuance made pursuant to the initial public offering of the Issuer's units, as reported by the Issuer in its current report on Form 8-K filed with the Securities and Exchange Commission on April 22, 2026.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: KPET Ultra Paceline Corp
(b)	Address of issuer's principal executive offices: 5109 S. BROADBAND LANE, SIOUX FALLS, SOUTH DAKOTA, 57108.
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): G53157122
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:	05/13/2026

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:	05/13/2026

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:	05/13/2026

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:	05/13/2026

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:	05/13/2026

Exhibit Information

Exhibit 99.1 Joint Filing Agreement (filed herewith).