Sponsor for ACP Holdings (ACGCU) buys 435K Class A shares

Rhea-AI Filing Summary

Union Street Sponsor, LLC, a 10% owner of ACP Holdings Acquisition Corp., reported an open-market style purchase tied to the company’s initial public offering. The sponsor purchased 435,000 private placement units, each including one Class A ordinary share and one-half of a redeemable warrant, at $10.00 per unit, for a total of $4,350,000. Following the transaction, the sponsor holds 435,000 Class A ordinary shares. The filing notes that Union Street Management Sponsor, LLC manages the sponsor, and Andrew Mallozzi has voting and investment discretion, while disclaiming beneficial ownership beyond any pecuniary interest.

Insider Trade Summary

1 transaction reported

Net Buy 1 txn

Insider Union Street Sponsor, LLC

Role 10% Owner

Bought 435,000 shs ($0.00)

Type	Security	Shares	Price	Value
Purchase	Class A ordinary shares	435,000	$0.00	--

Holdings After Transaction: Class A ordinary shares — 435,000 shares (Direct, null)

Footnotes (1)

1. Simultaneously with the consummation of ACP Holdings Acquisition Corp.'s (the "Issuer") initial public offering, Union Street Sponsor, LLC (the "Sponsor") purchased 435,000 private placement units ("Private Placement Units"), each consisting of (i) one Class A ordinary share and (ii) one-half of one redeemable warrant, at a price of $10.00 per unit, or $4,350,000 in the aggregate. Reflects the 435,000 Class A ordinary shares underlying the Private Placement Units. 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 the 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.

Key Figures

Private placement units purchased: 435,000 units Price per unit: $10.00 per unit Aggregate purchase amount: $4,350,000 +2 more

5 metrics

Private placement units purchased 435,000 units Simultaneous with ACP Holdings initial public offering

Price per unit $10.00 per unit Private placement units including one Class A share and half a warrant

Aggregate purchase amount $4,350,000 Total consideration for 435,000 private placement units

Shares held after transaction 435,000 Class A ordinary shares Total Class A shares underlying the private placement units

Net buy shares 435,000 shares Net-buy direction in transaction summary

Key Terms

private placement units, redeemable warrant, beneficial ownership, pecuniary interest

4 terms

private placement units financial

"purchased 435,000 private placement units ("Private Placement Units"), each consisting of (i) one Class A ordinary share"

redeemable warrant financial

"each consisting of (i) one Class A ordinary share and (ii) one-half of one redeemable warrant"

A redeemable warrant is a financial tool that gives its holder the right to buy shares of a company at a fixed price within a certain period. If the holder chooses to do so, the company can buy back or cancel the warrant before it expires, often to encourage investment or manage share issuance. For investors, it provides an option to potentially buy shares at a favorable price while offering some flexibility for the issuing company.

beneficial ownership financial

"Mr. Mallozzi disclaims any beneficial ownership of the securities held by the Sponsor"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

pecuniary interest financial

"other than to the extent of any pecuniary interest he may have therein, directly or indirectly"

Form 4 Insider Transactions: What Each Field Means →

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^*

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. Issuer Name and Ticker or Trading Symbol
ACP Holdings Acquisition Corp. [ ACGCU ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/08/2026

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

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

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

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	04/08/2026		P		435,000	A	(1)	435,000(2)	D(3)

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 consummation of ACP Holdings Acquisition Corp.'s (the "Issuer") initial public offering, Union Street Sponsor, LLC (the "Sponsor") purchased 435,000 private placement units ("Private Placement Units"), each consisting of (i) one Class A ordinary share and (ii) one-half of one redeemable warrant, at a price of $10.00 per unit, or $4,350,000 in the aggregate.

2. Reflects the 435,000 Class A ordinary shares underlying the Private Placement Units.

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 the 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, as Authorized Representative of Union Street Sponsor, LLC	04/10/2026
	** 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 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Union Street Sponsor report for ACGCU?

Union Street Sponsor, LLC reported buying 435,000 private placement units of ACP Holdings Acquisition Corp. Each unit includes one Class A share and half a warrant. This totals 435,000 Class A ordinary shares underlying the units after the transaction.

How much did the ACGCU sponsor pay for the private placement units?

The sponsor paid $10.00 per private placement unit, purchasing 435,000 units for $4,350,000 in total. Each unit consists of one Class A ordinary share and one-half of one redeemable warrant, acquired simultaneously with the initial public offering.

How many ACP Holdings (ACGCU) shares does the sponsor hold after this Form 4?

After the transaction, Union Street Sponsor, LLC holds 435,000 Class A ordinary shares of ACP Holdings Acquisition Corp. These shares reflect the Class A ordinary shares underlying the private placement units purchased in connection with the company’s initial public offering.

What are ACGCU private placement units as described in the Form 4?

The private placement units are securities purchased by the sponsor at $10.00 per unit. Each unit consists of one Class A ordinary share of ACP Holdings Acquisition Corp. and one-half of one redeemable warrant, providing both equity and warrant exposure in a single instrument.

Who has voting and investment discretion over the ACGCU sponsor’s shares?

Union Street Management Sponsor, LLC is the managing member of Union Street Sponsor, LLC. Andrew Mallozzi is the managing member of Union Street Management Sponsor, LLC and has voting and investment discretion over the securities, while disclaiming beneficial ownership beyond any pecuniary interest.