Rainier Acquisition adds new 5.2% unit holder

Rainier Acquisition Corp (RNAQU) has a new significant holder disclosure.

Rhea-AI Filing Summary

Rainier Acquisition Corp (RNAQU) has a new significant holder disclosure. MMCAP International Inc. SPC and MM Asset Management Inc. jointly report beneficial ownership of 400,000 Units of Rainier Acquisition Corp, representing 5.2% of the Unit class, based on 7,694,375 Units outstanding as of August 28, 2026. The reporting persons have shared voting and dispositive power over all 400,000 Units and no sole voting or dispositive power. The securities are Units consisting of Class A ordinary shares with $0.0001 par value and redeemable warrants.

Key Figures

Units beneficially owned: 400,000 Units Percent of class: 5.2% Outstanding Units: 7,694,375 Units +2 more

5 metrics

Units beneficially owned 400,000 Units Beneficial ownership of Rainier Acquisition Corp Units reported on Schedule 13G

Percent of class 5.2% Ownership percentage of Rainier Acquisition Corp Units based on outstanding Units as of August 28, 2026

Outstanding Units 7,694,375 Units Issuer Units outstanding as of August 28, 2026, used to calculate ownership percentage

Shared voting power 400,000 Units Units over which the reporting persons share voting power

Shared dispositive power 400,000 Units Units over which the reporting persons share dispositive power

Key Terms

beneficially owned, shared voting power, shared dispositive power, Units (Class A Ordinary Shares, $0.0001 par vaue, and Redeemable Warrants), +1 more

5 terms

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned: 400,000"

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 voting power financial

"Shared Voting Power 400,000.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"Shared Dispositive Power 400,000.00"

Units (Class A Ordinary Shares, $0.0001 par vaue, and Redeemable Warrants) financial

"Title of class of securities: Units (Class A Ordinary Shares..."

Schedule 13G regulatory

"form_type": "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.

FAQ

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

What percentage of Rainier Acquisition Corp (RNAQU) units is owned by the reporting group?

MMCAP International Inc. SPC and MM Asset Management Inc. report beneficial ownership of 5.2% of Rainier Acquisition Corp’s Units, based on 7,694,375 Units outstanding as of August 28, 2026.

How many Rainier Acquisition Corp (RNAQU) units are beneficially owned by the filers?

The reporting persons beneficially own 400,000 Units of Rainier Acquisition Corp. These Units carry shared voting and shared dispositive power between the filers, with no sole voting or dispositive power reported.

What security class is covered in this Schedule 13G for RNAQU?

The filing covers Units of Rainier Acquisition Corp, each consisting of Class A Ordinary Shares ($0.0001 par value) and Redeemable Warrants, identified by CUSIP G73591110.

Who are the reporting persons in this Rainier Acquisition Corp (RNAQU) Schedule 13G?

The reporting persons are MMCAP International Inc. SPC, organized in the Cayman Islands, and MM Asset Management Inc., organized in Ontario, Canada. They file jointly under a Joint Filing Agreement (Exhibit 99.1).

What voting and dispositive powers are reported over RNAQU units?

The filers report 0 Units with sole voting or dispositive power and 400,000 Units with shared voting power and shared dispositive power over Rainier Acquisition Corp’s Units.

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

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Available on EDGAR 09/02/2026 - 09:10 AM EDT Accepted by SEC EDGAR 09/01/2026 - 02:40 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Rainier Acquisition Corp

(Name of Issuer)

Units (Class A Ordinary Shares, $0.0001 par vaue, and Redeemable Warrants)

(Title of Class of Securities)

G73591110

(CUSIP Number)

08/28/2026

(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): G73591110

1

Names of Reporting Persons

MMCAP International Inc. SPC

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 400,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 400,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

400,000.00

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)

5.2 %

12

Type of Reporting Person (See Instructions)

CO

Comment for Type of Reporting Person: Based on 7,694,375 outstanding Issuer units as of August 28, 2026.

SCHEDULE 13G

CUSIP Number(s): G73591110

1

Names of Reporting Persons

MM Asset Management Inc.

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 400,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 400,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

400,000.00

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)

5.2 %

12

Type of Reporting Person (See Instructions)

CO

Comment for Type of Reporting Person: Based on 7,694,375 outstanding Issuer units as of August 28, 2026

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Rainier Acquisition Corp
(b)	Address of issuer's principal executive offices: 1 Penn Plaza, 48th Floor, New York, NY 10119
Item 2.
(a)	Name of person filing: i) MMCAP International Inc. SPC ii) MM Asset Management Inc.
(b)	Address or principal business office or, if none, residence: i) c/o Mourant Governance Services (Cayman) Limited, 94 Solaris Avenue, Camana Bay, P. O. Box 1348, Grand Cayman KY1-1108, Cayman Islands ii) 161 Bay Street, TD Canada Trust Tower, Suite 2240, Toronto, Ontario M5J 2S1 Canada
(c)	Citizenship: i) Cayman Islands ii) Ontario, Canada
(d)	Title of class of securities: Units (Class A Ordinary Shares, $0.0001 par vaue, and Redeemable Warrants)
(e)	CUSIP Number(s): G73591110
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: 400,000
(b)	Percent of class: 5.2% Based on 7,694,375 outstanding Issuer units as of August 28, 2026
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 400,000
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 400,000
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.

MMCAP International Inc. SPC

Signature:	Ulla Vestergaard
Name/Title:	Director
Date:	08/31/2026

MM Asset Management Inc.

Signature:	Hillel Meltz
Name/Title:	President
Date:	08/31/2026

Exhibit Information

Exhibit 99.1 Joint Filing Agreement