Union Street Sponsor, LLC 4

What Happened
Union Street Sponsor, LLC (the Sponsor), a reported 10% owner of ACP Holdings Acquisition Corp. (ACGCU), purchased 435,000 private placement units on April 8, 2026. Each unit consisted of one Class A ordinary share and one-half of a redeemable warrant, at $10.00 per unit, for an aggregate purchase price of $4,350,000. The Form 4 reports the Sponsor as the record holder of the 435,000 Class A shares underlying those units. This transaction is coded as a purchase (P).

Key Details

• Transaction date: April 8, 2026; Form 4 filed April 10, 2026 (timely reported).
• Consideration: $10.00 per unit; aggregate $4,350,000.
• Securities acquired: 435,000 Class A ordinary shares (via 435,000 private placement units).
• Warrants: units include one-half warrant each → 217,500 redeemable warrants attached.
• Shares owned after transaction: 435,000 Class A shares reported of record by the Sponsor.
• Footnotes: F1—purchase was simultaneous with the Issuer’s IPO; F2—435,000 shares reflect underlying Class A shares; F3—Sponsor is record holder; Union Street Management Sponsor, LLC is managing member and Andrew Mallozzi has voting/investment discretion but disclaims beneficial ownership beyond any pecuniary interest.
• Transaction code: P = Purchase.

Context
This was a private placement purchase made concurrently with the company’s IPO (typical for sponsors/founders) and included warrants in addition to shares. As a 10% sponsor entity (institutional sponsor), this is part of structuring the offering rather than routine executive trading; such sponsor purchases are informative but not the same signal as an individual insider buying or selling for personal reasons.