Keystone Acquisition director holds 40,000 share rights

Keystone Acquisition Corp. director John A. Boehner filed an initial ownership report showing holdings of 40,000 Class B ordinary shares.

Rhea-AI Filing Summary

Keystone Acquisition Corp. director John A. Boehner filed an initial ownership report showing holdings of 40,000 Class B ordinary shares. These Class B shares are convertible into 40,000 Class A ordinary shares as described in the company’s registration statement and have no expiration date.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider BOEHNER John A.

Role Director

Type	Security	Shares	Price	Value
holding	Class B Ordinary Shares	--	--	--

Holdings After Transaction: Class B Ordinary Shares — 40,000 contracts (Direct)

Footnotes (1)

1. F1. The Class B ordinary shares are convertible for the Issuer's Class A ordinary shares as described under the heading "Description of Securities" in the Issuer's Registration Statement on Form S-1 (File No. 333-295539) (the "Registration Statement") and have no expiration date.

Key Figures

Class B shares held: 40,000 shares Underlying Class A shares: 40,000 shares Conversion/exercise price: $0.0000 per share

3 metrics

Class B shares held 40,000 shares Beneficial ownership reported on Form 3

Underlying Class A shares 40,000 shares Shares issuable upon conversion of Class B ordinary shares

Conversion/exercise price $0.0000 per share Conversion price for Class B into Class A shares

Key Terms

Class B Ordinary Shares, Class A Ordinary Shares, Registration Statement on Form S-1, convertible

4 terms

Class B Ordinary Shares financial

"The Class B ordinary shares are convertible for the Issuer's Class A ordinary shares"

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.

Class A Ordinary Shares financial

"The Class B ordinary shares are convertible for the Issuer's Class A ordinary shares"

Class A ordinary shares are a type of ownership stake in a company that typically grants voting rights to shareholders, allowing them to have a say in important company decisions. They often come with priority in receiving dividends or profits, making them attractive to investors seeking influence and potential income. These shares help distinguish different levels of ownership and rights within a company's stock structure.

Registration Statement on Form S-1 regulatory

"as described under the heading "Description of Securities" in the Issuer's Registration Statement on Form S-1"

A registration statement on Form S-1 is a detailed filing a company submits to the U.S. securities regulator to register new shares for public sale; it includes a plain-language prospectus, financial statements, business description and risk factors. For investors it matters because it provides the official, comprehensive blueprint of the offering — like an owner’s manual — allowing buyers to assess risks, inspect financial health and compare valuation before deciding to invest.

convertible financial

"The Class B ordinary shares are convertible for the Issuer's Class A ordinary shares"

A convertible is a type of investment that starts as a loan or preferred stake (like a bond or preferred share) but can be exchanged for common shares of the company at a set price or under certain conditions. It matters to investors because it offers a mix of steady income and downside protection like a loan, plus the upside of stock ownership if the company does well—similar to holding a coupon that you can trade for a full ticket if the event becomes valuable.

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

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Accepted by SEC EDGAR 06/02/2026 - 09:53 PM EDT Learn about SEC filing dates

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

BOEHNER John A.

(Last) (First) (Middle)

C/O KEYSTONE ACQUISITION CORP.

142 WEST 57TH STREET, 11TH FLOOR

(Street)

NEW YORK NEW YORK 10019

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
06/02/2026

3. Issuer Name and Ticker or Trading Symbol
Keystone Acquisition Corp. [ KEYY ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Class B Ordinary Shares	(1)	(1)	Class A Ordinary Shares	40,000	(1)	D

Explanation of Responses:

1. The Class B ordinary shares are convertible for the Issuer's Class A ordinary shares as described under the heading "Description of Securities" in the Issuer's Registration Statement on Form S-1 (File No. 333-295539) (the "Registration Statement") and have no expiration date.

Remarks:

See Exhibit 24.1 - Power of Attorney.

	/s/ Claudia Hanover, Attorney-in-Fact	06/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)