Sec Form 3 Filing - United Acquisition SPAC LLC @ United Acquisition Corp. I - 2026-01-28

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person United Acquisition SPAC LLC 2. Issuer Name and Ticker or Trading Symbol United Acquisition Corp. I [ UACU] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O UNITED ACQUISITION CORP. I, 7100 W. CAMINO REAL, SUITE 302-48 3. Date of Earliest Transaction (MM/DD/YY) 01/28/2026 (Street) BOCA RATON, FL33433 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 ( 1 ) 175,000 D ( 2 )

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: 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 Class B Ordinary Shares ( 3 ) ( 3 ) ( 3 ) Class A Ordinary Shares 3,733,333 ( 4 ) D ( 2 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other United Acquisition SPAC LLC C/O UNITED ACQUISITION CORP. I 7100 W. CAMINO REAL, SUITE 302-48 BOCA RATON, FL33433 X PACKER PAUL C/O UNITED ACQUISITION CORP. I 7100 W. CAMINO REAL, SUITE 302-48 BOCA RATON, FL33433 X X CEO, CFO and Chairman Signatures /s/ Paul Packer, as the managing member of United Acquisition SPAC LLC 01/28/2026 Signature of Reporting Person Date /s/ Paul Packer 01/28/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )These Class A ordinary shares (the "Private Placement Shares") underlie the 175,000 private placement units (the "Private Placement Units") that United Acquisition SPAC LLC (the "Sponsor") has irrevocably committed to purchase from United Acquisition Corp. I (the "Issuer") in a private placement that will close simultaneously with the consummation of the Issuer's initial public offering, at $10.00 per Private Placement Unit, as described in in the Issuer's registration statement on Form S-1 (File No. 333-291904) (the "Registration Statement"). Each Private Placement Unit is comprised of one Private Placement Share and one-quarter of one warrant (the "Private Placement Warrants"), with each whole Private Placement Warrant exercisable to purchase one Private Placement Share. Does not represent any Private Placement Shares issuable upon the exercise of the Private Placement Warrants. ( 2 )Mr. Paul Packer, the Issuer's Chairman, Chief Executive Officer and Chief Financial Officer, is the sole managing member of the Sponsor. As a result, Mr. Packer may be deemed to have beneficial ownership of the Class B ordinary shares and the Private Placement Units (including the Private Placement Shares included in such units) held by the Sponsor. Mr. Packer disclaims such beneficial ownership except to the extent of his pecuniary interest therein. ( 3 )As described in the Issuer's Registration Statement, the Class B ordinary shares will automatically convert into Class A ordinary at the time of the Issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to certain adjustments described therein and have no expiration date. ( 4 )These Class B ordinary shares are held by the Sponsor and were acquired pursuant to a subscription agreement by and between the Sponsor and the Issuer. The Class B ordinary shares owned by the Sponsor include up to 500,000 shares that are subject to forfeiture to the extent that the underwriters' over-allotment option is not exercised in full, as described in the Issuer's Registration Statement.

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