UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarter ended August 31, 2025 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-42555 Quartzsea Acquisition Corporation (Exact Name of Registrant as Specified in Its Charter) Cayman Islands N/A | Large accelerated file ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarter ended May 31, 2025 Commission file number: 001-42555 Quartzsea Acquisition Corporation (Exact Name of Registrant as Specified in Its Charter) Cayman Islands N/A (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.) 1185 Avenue of the Americas, Suite 304 New York, NY ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarter ended February 28, 2025 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-42555 Quartzsea Acquisition Corporation (Exact Name of Registrant as Specified in Its Charter) Cayman Islands N/A (State or other jurisd ...