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

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1. Name and Address of Reporting Person* Union Street Sponsor, LLC (Last) (First) (Middle) C/O ACP HOLDINGS ACQUISITION CORP. 3131 EASTSIDE STREET (Street) HOUSTON TEXAS 77098 (City) (State) (Zip) UNITED STATES (Country)	2. Date of Event Requiring Statement (Month/Day/Year) 04/06/2026	3. Issuer Name and Ticker or Trading Symbol ACP Holdings Acquisition Corp. [ ACGCU ]
		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 X 10% Owner Officer (give title below) Other (specify below)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X 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, par value $0.0001 per share	(1)	(1)	Class A Ordinary Shares, par value $0.0001 per share	7,153,867	(1)	D(2)(3)

1. Name and Address of Reporting Person* Union Street Sponsor, LLC (Last) (First) (Middle) C/O ACP HOLDINGS ACQUISITION CORP. 3131 EASTSIDE STREET (Street) HOUSTON TEXAS 77098 (City) (State) (Zip) UNITED STATES (Country) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* Mallozzi Andrew Emilio (Last) (First) (Middle) C/O ACP HOLDINGS ACQUISITION CORP. 3131 EASTSIDE STREET (Street) HOUSTON TEXAS 77098 (City) (State) (Zip) UNITED STATES (Country) Relationship of Reporting Person(s) to Issuer X Director X 10% Owner X Officer (give title below) Other (specify below) CEO and Chairman of the Board

Explanation of Responses:

1. As described in the registration statement on Form S-1 (File No. 333-294120) of ACP Holdings Acquisition Corp. (the "Issuer") under the heading "Description of Securities--Founder Shares," the Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the Issuer's initial business combination, or at any time prior to the Issuer's initial business combination, at the option of the holder, on a one-for-one basis, subject to certain adjustments. The Class B ordinary shares have no expiration date.

2. These shares represent the 7,666,667 Class B ordinary shares initially held by Union Street Sponsor, LLC (the "Sponsor") acquired pursuant to a subscription agreement by and between the Issuer and the Sponsor. The Sponsor then forfeited to the Issuer 512,800 founder shares based on the extent of the underwriters of the Issuer's initial public offering exercise of their over-allotment option as described in the Issuer's registration statement.

3. The Sponsor is the record holder of such shares. Union Street Management Sponsor, LLC is the managing member of the Sponsor. Andrew Mallozzi is the managing member of Union Street Management Sponsor, LLC, and has voting and investment discretion with respect to the securities held of record by the Sponsor. Mr. Mallozzi disclaims any beneficial ownership of the securities held by the Sponsor other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

	/s/ Andrew Mallozzi for Union Street Sponsor, LLC, Name: Andrew Mallozzi Title: Authorized Representative	04/16/2026
	/s/ Andrew Mallozzi	04/16/2026
	** 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).
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* Form 3: SEC 1473 (03-26)