[Form 4] Yorkville Acquisition Corp. Unit Insider Trading Activity

Rhea-AI Filing Summary

Troy Rillo, Chief Financial Officer of Yorkville Acquisition Corp. (YORK), reported a purchase agreement for Class A Ordinary Shares tied to the issuer's pending business combination. The Form 4 discloses that on 08/25/2025 the reporting person executed a purchase (transaction code P) of 91,770 Class A Ordinary Shares at a price of $1 per share, and that he beneficially owned 91,770 shares following the reported transaction. The filing explains the shares are to be purchased from Clear Street LLC upon closing of the business combination. The form is signed by Troy Rillo on 09/10/2025 and lists his address in Mountainside, NJ.

Positive

• Insider purchase disclosed: CFO agreed to acquire 91,770 Class A Ordinary Shares, signaling alignment with the pending business combination.
• Price stated: The shares are priced at $1 per share, and beneficial ownership post-transaction is clearly reported as 91,770 shares.

Negative

• None.

Insights

Securities Analyst

TL;DR: Insider has a committed purchase of 91,770 Class A shares at $1 tied to the closing of the business combination.

The Form 4 documents a beneficial acquisition by the issuer's CFO via a purchase agreement with Clear Street LLC, effective 08/25/2025, for 91,770 Class A Ordinary Shares at $1 per share. This is recorded under transaction code P, indicating a purchase pursuant to an agreement. For investors, insider purchases at nominal SPAC share prices can signal management alignment with the proposed combination, but the filing contains no information about the business combination terms, timing, or financing beyond the stated contingent purchase upon closing. The filing is narrowly focused on ownership change and does not provide forward-looking details.

Corporate Governance Expert

TL;DR: CFO's committed acquisition is disclosed; it's contingent on the closing of the business combination.

The disclosure clearly identifies the reporting person as the CFO and a purchaser of 91,770 Class A Ordinary Shares from Clear Street LLC upon closing of the business combination. The use of transaction code P and the explanatory note indicate the agreement was simultaneous with entry into the business combination agreement. The filing is procedural and compliant in specifying beneficial ownership after the transaction. It does not disclose whether the purchase is part of a broader sponsor/insider support agreement or any special transfer restrictions.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Rillo Troy

(Last) (First) (Middle)

1012 SPRINFIELD AVENUE

(Street)

MOUNTAINSIDE NJ 07092

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Yorkville Acquisition Corp. [ YORK ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
08/25/2025

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

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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Ordinary Shares	08/25/2025		P		91,770	A	$1(1)	91,770	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Simultaneously with the entry into a business combination agreement by the Issuer, the reporting person agreed to purchase those certain Class A Ordinary Shares from Clear Street LLC, upon closing of the business combination.

	/s/ Troy Rillo	09/10/2025
	** 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 4 (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.

FAQ

What did Yorkville Acquisition Corp. (YORKU) report on this Form 4?

The Form 4 reports that CFO Troy Rillo agreed to purchase 91,770 Class A Ordinary Shares at $1 per share, contingent upon closing of the business combination.

When was the transaction dated on the Form 4 for YORKU?

The transaction date listed is 08/25/2025, and the Form 4 is signed by the reporting person on 09/10/2025.

From whom are the shares being purchased according to the filing?

The filing states the shares are to be purchased from Clear Street LLC upon closing of the business combination.

How many shares does the reporting person beneficially own after the reported transaction for YORKU?

The reporting person beneficially owns 91,770 Class A Ordinary Shares following the reported transaction.

Does the Form 4 disclose terms of the business combination?

No. The Form 4 notes the purchase is simultaneous with entry into a business combination agreement but does not disclose the business combination's financial terms or timing.