AQR reports 5.99% stake in Keystone Acquisition

AQR Capital Management, LLC, AQR Capital Management Holdings, LLC, and AQR Arbitrage, LLC report a passive ownership stake in Keystone Acquisition Corp. They collectively beneficially own 1,723,275 units, representing 1,723,275 Class A ordinary shares.

Rhea-AI Filing Summary

AQR Capital Management, LLC, AQR Capital Management Holdings, LLC, and AQR Arbitrage, LLC report a passive ownership stake in Keystone Acquisition Corp. They collectively beneficially own 1,723,275 units, representing 1,723,275 Class A ordinary shares.

This position equals 5.99% of the outstanding Class A ordinary shares. The AQR entities report no sole voting or dispositive power over these shares, but shared voting and shared dispositive power over all 1,723,275 shares. AQR Capital Management, LLC is a wholly owned subsidiary of AQR Capital Management Holdings, LLC, and AQR Arbitrage, LLC is deemed controlled by AQR Capital Management, LLC.

Key Figures

Beneficially owned shares: 1,723,275 shares Percent of Class A shares: 5.99 % Shared voting power: 1,723,275 shares +2 more

5 metrics

Beneficially owned shares 1,723,275 shares Units representing Class A ordinary shares beneficially owned by AQR entities

Percent of Class A shares 5.99 % Portion of Keystone Acquisition Corp. Class A ordinary shares beneficially owned

Shared voting power 1,723,275 shares Shares over which AQR entities have shared power to vote or direct the vote

Shared dispositive power 1,723,275 shares Shares over which AQR entities have shared power to dispose or direct disposition

Par value per share $0.0001 per share Par value of Keystone Acquisition Corp. Class A ordinary shares

Key Terms

beneficially owned, shared voting power, shared dispositive power, parent holding company

4 terms

beneficially owned financial

"Amount beneficially owned: 1,723,275 Units representing 1,723,275 shares"

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 power to vote or to direct the vote: ... 1,723,275"

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 power to dispose or to direct the disposition of: ... 1,723,275"

parent holding company financial

"If a parent holding company has filed this schedule, pursuant to (ii)(G)"

FAQ

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

How many Keystone Acquisition Corp. (KEYY) shares does AQR report owning?

AQR entities report beneficial ownership of 1,723,275 units, representing 1,723,275 Class A ordinary shares of Keystone Acquisition Corp. This entire amount is held with shared voting and shared dispositive power among the reporting AQR entities.

What percentage of Keystone Acquisition Corp. (KEYY) does AQR beneficially own?

AQR reports beneficial ownership of 5.99% of Keystone Acquisition Corp.’s Class A ordinary shares. This percentage is based on 1,723,275 shares beneficially owned through units, all subject to shared voting and dispositive power.

Which AQR entities are reporting ownership in Keystone Acquisition Corp. (KEYY)?

The reporting persons are AQR Capital Management, LLC, AQR Capital Management Holdings, LLC, and AQR Arbitrage, LLC. AQR Capital Management, LLC is wholly owned by AQR Capital Management Holdings, LLC, and AQR Arbitrage, LLC is deemed controlled by AQR Capital Management, LLC.

Does AQR have sole or shared voting power over its KEYY shares?

The AQR entities report 0 shares with sole voting power and 1,723,275 shares with shared voting power. They likewise report 0 shares with sole dispositive power and 1,723,275 shares with shared dispositive power over Keystone Acquisition Corp. shares.

What type of Keystone Acquisition Corp. (KEYY) security is AQR reporting on?

AQR reports ownership of Units representing Class A ordinary shares of Keystone Acquisition Corp. Specifically, they hold 1,723,275 units, each representing one Class A ordinary share with a par value of $0.0001 per share.

Where are Keystone Acquisition Corp. (KEYY) and AQR’s principal offices located?

Keystone Acquisition Corp.’s principal executive offices are at 228 Park Avenue S PMB 242627, New York, NY 10003. The AQR reporting entities’ principal business office is at One Greenwich Plaza, Suite 130, Greenwich, Connecticut 06830.

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

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Available on EDGAR 08/13/2026 - 11:29 AM EDT Accepted by SEC EDGAR 08/13/2026 - 11:29 AM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Keystone Acquisition Corp.

(Name of Issuer)

Class A ordinary shares, par value $0.0001 per share

(Title of Class of Securities)

G52539106

(CUSIP Number)

06/30/2026

(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): G52539106

1

Names of Reporting Persons

AQR Capital Management, 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

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,723,275.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,723,275.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,723,275.00

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)

5.99 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP Number(s): G52539106

1

Names of Reporting Persons

AQR Capital Management Holdings, 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

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,723,275.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,723,275.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,723,275.00

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)

5.99 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): G52539106

1

Names of Reporting Persons

AQR Arbitrage, 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

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,723,275.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,723,275.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,723,275.00

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)

5.99 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Keystone Acquisition Corp.
(b)	Address of issuer's principal executive offices: 228 PARK AVENUE S PMB 242627, NEW YORK, NEW YORK 10003
Item 2.
(a)	Name of person filing: AQR Capital Management, LLC AQR Capital Management Holdings, LLC AQR Arbitrage, LLC
(b)	Address or principal business office or, if none, residence: ONE GREENWICH PLAZA SUITE 130 Greenwich, Connecticut 06830
(c)	Citizenship: AQR Capital Management, LLC - UNITED STATES AQR Capital Management Holdings, LLC - UNITED STATES AQR Arbitrage, LLC - UNITED STATES
(d)	Title of class of securities: Class A ordinary shares, par value $0.0001 per share
(e)	CUSIP Number(s): G52539106
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: 1,723,275 Units representing 1,723,275 shares of Class A ordinary shares, par value $0.0001 per share
(b)	Percent of class: 5.99 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: AQR Capital Management, LLC - 0 AQR Capital Management Holdings, LLC - 0 AQR Arbitrage, LLC - 0
	(ii) Shared power to vote or to direct the vote: AQR Capital Management, LLC - 1,723,275 AQR Capital Management Holdings, LLC - 1,723,275 AQR Arbitrage, LLC - 1,723,275
	(iii) Sole power to dispose or to direct the disposition of: AQR Capital Management, LLC - 0 AQR Capital Management Holdings, LLC - 0 AQR Arbitrage, LLC - 0
	(iv) Shared power to dispose or to direct the disposition of: AQR Capital Management, LLC - 1,723,275 AQR Capital Management Holdings, LLC - 1,723,275 AQR Arbitrage, LLC - 1,723,275
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.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Item 2(a) above.
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 acquired and are held in the ordinary course of business and 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.

AQR Capital Management, LLC

Signature:	Henry Parkin
Name/Title:	Authorized Signatory
Date:	08/13/2026

AQR Capital Management Holdings, LLC

Signature:	Henry Parkin
Name/Title:	Authorized Signatory
Date:	08/13/2026

AQR Arbitrage, LLC

Signature:	Henry Parkin
Name/Title:	Authorized Signatory
Date:	08/13/2026

Exhibit Information

AQR Capital Management Holdings, LLC, AQR Capital Management, LLC, and AQR Arbitrage, LLC hereby agree that this Schedule 13G is filed on behalf of each of the parties. AQR Capital Management, LLC is a wholly owned subsidiary of AQR Capital Management Holdings, LLC. AQR Arbitrage, LLC is deemed to be controlled by AQR Capital Management, LLC.