Sec Form 4 Filing - Hernandez Joseph @ Blue Water Acquisition Corp. III - 2025-06-11

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 Hernandez Joseph 2. Issuer Name and Ticker or Trading Symbol Blue Water Acquisition Corp. III [ BLUW] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Executive Officer (Last) (First) (Middle) C/O BLUE WATER ACQUISITION CORP. III, 15 E PUTNAM AVENUE, SUITE 363 3. Date of Earliest Transaction (MM/DD/YY) 06/11/2025 (Street) GREENWICH, CT06830 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ 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 06/11/2025 P 430,000 A 430,000 I See Footnote ( 1 )

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 Warrants to purchase Class A ordinary shares $ 11.5 06/11/2025 P 215,000 ( 2 ) ( 2 ) Class A ordinary shares 215,000 ( 1 ) 215,000 I See Footnote ( 1 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Hernandez Joseph C/O BLUE WATER ACQUISITION CORP. III 15 E PUTNAM AVENUE, SUITE 363 GREENWICH, CT06830 X X Chief Executive Officer Signatures /s/ Joseph Hernandez 06/12/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Reflects the 430,000 private units owned by Blue Water Acquisition III LLC, the Issuer's sponsor. Each private unit consists of one Class A ordinary share and one-half of one warrant, with each whole warrant entitling the holder thereof to purchase one Class A ordinary share for $11.50 per share, subject to adjustment. The private units were purchased at $10.00 per unit for an aggregate purchase price of $4,300,000. Joseph Hernandez is the managing member of the sponsor and has voting and dispositive power over the securities held of record by the sponsor. Mr. Hernandez disclaims any beneficial ownership of the securities held by the sponsor, except to the extent of his pecuniary interest therein. ( 2 )The warrants included in the private units will become exercisable at the later of 12 months from the closing of the Issuer's initial public offering and 30 days after the completion of its initial business combination and will expire five years after the completion of the initial business combination or earlier upon redemption or liquidation.

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).

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