Sec Form 3 Filing - Gong Qi @ Quartzsea Acquisition Corp - 2025-03-14

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 Gong Qi 2. Issuer Name and Ticker or Trading Symbol Quartzsea Acquisition Corp [ QSEAU] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chairwoman, CEO, and CFO (Last) (First) (Middle) C/O QUARTZSEA ACQUISITION CORPORATION,, 1185 6TH AVE., SUITE 304 3. Date of Earliest Transaction (MM/DD/YY) 03/14/2025 (Street) NEW YORK,, NY10036 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 Ordinary Shares, par value $0.0001 per share 3,129,900 ( 1 ) I ( 3 ) See footnote

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 Rights ( 2 ) ( 2 ) ( 2 ) Ordinary Shares 46,380 ( 2 ) I ( 3 ) See footnote

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Gong Qi C/O QUARTZSEA ACQUISITION CORPORATION, 1185 6TH AVE., SUITE 304 NEW YORK,, NY10036 X Chairwoman, CEO, and CFO Signatures /s/ Qi Gong 03/28/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Includes 2,898,000 ordinary shares (of which 378,000 ordinary shares are subject to forfeiture if the underwriter's overallotment option is not fully exercised) and 231,900 ordinary shares underlying the private placement units, which were sold in a private placement taking place simultaneously with the Quartzsea Acquisition Corporation's initial public offering. ( 2 )Includes 231,900 rights underlying the private placement units, which were sold in a private placement taking place simultaneously with the Quartzsea Acquisition Corporation's initial public offering. Each right is exchangeable for one fifth of one ordinary share upon the completion of Quartzsea Acquisition Corporation's initial business combination. ( 3 )Blue Jay Investment LLC, a Delaware limited liability company, is the record holder of the securities reported herein, which is controlled by Qi Gong.

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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