Sec Form 4 Filing - Blue Holdings Sponsor LLC @ Blue Acquisition Corp/Cayman - 2026-06-16

FORM 4 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 Blue Holdings Sponsor LLC 2. Issuer Name and Ticker or Trading Symbol Blue Acquisition Corp/Cayman [ BACC] 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 BLUE ACQUISITION CORP., 1601 ANITA LANE 3. Date of Earliest Transaction (MM/DD/YY) 06/16/2026 (Street) NEWPORT BEACH, CA92660 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 06/16/2025 P 391,000 ( 3 ) A 391,000 ( 3 ) 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 (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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Blue Holdings Sponsor LLC C/O BLUE ACQUISITION CORP. 1601 ANITA LANE NEWPORT BEACH, CA92660 X Blue Holdings Management LLC C/O BLUE ACQUISITION CORP. 1601 ANITA LANE NEWPORT BEACH, CA92660 X Bauer David Raphael C/O BLUE ACQUISITION CORP. 1601 ANITA LANE NEWPORT BEACH, CA92660 X X CEO and CFO Signatures /s/ David Bauer, Managing Member of Blue Holdings Management LLC, Managing Member of Blue Holdings Sponsor LLC 06/18/2026 Signature of Reporting Person Date /s/ David Bauer 06/18/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This filing is being made solely to reflect a change in the beneficial owner of securities held by Blue Holdings Sponsor LLC ("Sponsor"). On June 16, 2026, Ketan Seth, the former Chief Executive Officer of the Issuer (a position from which Mr. Seth resigned as of June 9, 2026), resigned from his position as the managing member of Blue Holdings Management LLC ("BHM"), the managing member of the Sponsor, and forfeited and surrendered to BHM any and all rights, tile or interest in and to any membership units of BHM and any securities of the Issuer, including, without limitation, any right, title or interest to or in any securities of the surviving public company upon and after the consummation (the "Closing"), if any, of the proposed business combination transaction between the Issuer and Blockfusion USA, Inc. ( 2 )Upon the resignation and forfeiture by Ketan Seth, David Bauer, the Issuer's interim Chief Executive Officer and Chief Financial Officer, was appointed as the managing member of BHM and holds voting and investment discretion with respect to the securities held of record by the Sponsor. As such, Mr. Bauer may be deemed to have beneficial ownership of the securities held of record by the Sponsor. Mr. Bauer disclaims any beneficial ownership except to the extent of his pecuniary interest therein. ( 3 )Reflects the 391,000 Class A ordinary shares of Blue Acquisition Corp. (the "Issuer") that are included in the 391,000 private placement units of the Issuer purchased by Blue Holdings Sponsor LLC ("Sponsor"). Each private placement unit was purchased for $10 per unit and consists of one Class A ordinary share and one right to receive one-tenth (1/10) of one Class A ordinary share upon consummation of the Issuer's initial business combination.

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).

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