Keystone CFO Cho Jaiho files Form 3

Keystone Acquisition Corp. filed an initial insider ownership report for Cho Jaiho, who serves as Chief Financial Officer.

Rhea-AI Filing Summary

Keystone Acquisition Corp. filed an initial insider ownership report for Cho Jaiho, who serves as Chief Financial Officer. This Form 3 identifies Cho as a reporting person for the company’s securities. The filing excerpt does not show any buy or sell transactions or derivative positions for Cho.

Key Figures

Buy transactions: 0 transactions Sell transactions: 0 transactions Derivative transactions: 0 transactions +1 more

4 metrics

Buy transactions 0 transactions Form 3 transaction summary for Cho Jaiho

Sell transactions 0 transactions Form 3 transaction summary for Cho Jaiho

Derivative transactions 0 transactions Form 3 derivative transaction count

Net buy/sell direction neutral Form 3 transactionSummary field

Key Terms

Form 3, Chief Financial Officer, reporting person

3 terms

Form 3 regulatory

"INSIDER FILING DATA (Form 3)"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

Chief Financial Officer financial

""officer_title": "Chief Financial Officer""

A Chief Financial Officer (CFO) is the person in charge of a company's money and financial planning. They decide how to spend, save, and invest funds to help the company grow and stay stable. Their role is important because good financial decisions keep the company healthy and successful.

reporting person regulatory

""reportingPersons": [{"name": "Cho Jaiho""

FAQ

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

What does the Keystone Acquisition Corp. (KEYYU) Form 3 for Cho Jaiho report?

The Form 3 identifies Cho Jaiho as a Chief Financial Officer and reporting person of Keystone Acquisition Corp. It serves as an initial insider ownership statement and, in this excerpt, shows no reported purchases, sales, or derivative positions for Cho.

Who is the insider named in Keystone Acquisition Corp. (KEYYU) Form 3?

The insider is Cho Jaiho, designated as Chief Financial Officer of Keystone Acquisition Corp. The filing formally records Cho’s status as a reporting person under SEC rules, even though no specific transactions or holdings appear in the provided data.

Does the Keystone Acquisition Corp. (KEYYU) Form 3 show any insider trades?

In the provided excerpt, the Form 3 shows no reported purchases or sales by Cho Jaiho. The transaction summary lists zero buy, sell, exercise, gift, tax-withholding, or restructuring transactions, indicating no trading activity is disclosed here.

What does the transaction summary indicate in the KEYYU Form 3 filing?

The transaction summary reports zero buys, sells, exercises, gifts, tax withholdings, and restructurings, with net buy/sell direction marked as neutral. This means the excerpted Form 3 reflects registration of insider status without accompanying trading activity data for Cho.

Are any derivative securities reported for Cho Jaiho in the KEYYU Form 3?

No derivative securities are shown in the excerpted data for Cho Jaiho. The derivativeSummary is empty and the derivative transaction count is zero, so there are no options, warrants, or similar instruments reported in this portion of the filing.

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

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Accepted by SEC EDGAR 06/02/2026 - 09:52 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^*

Cho Jaiho

(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)

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

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

Explanation of Responses:

Remarks:

See Exhibit 24.1 - Power of Attorney.

No securities are beneficially owned.

	/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)