0002047455 2026-06-16 2026-06-16 0002047455 CIK0002047455:UnitsEachConsistingOfOneOrdinaryShareAndOneRightMember 2026-06-16 2026-06-16 0002047455 CIK0002047455:OrdinarySharesParValue0.0001PerShareMember 2026-06-16 2026-06-16 0002047455 CIK0002047455:RightsEachRightEntitlingHolderToReceiveOnefifthOfOneOrdinaryShareMember 2026-06-16 2026-06-16 true 0002047455 8-K/A 2026-06-16 Quartzsea Acquisition Corporation E9 001-42555 00-0000000 1185 Avenue of the Americas Suite 304 New York NY 10036 (212) 612-1400 false false false false Units, each consisting of one ordinary share and one right QSEAU NASDAQ Ordinary shares, par value $0.0001 per share QSEA NASDAQ Rights, each right entitling the holder to receive one-fifth of one ordinary share QSEAR NASDAQ true false This Amendment No. 1 on Form 8-K/A amends the Current Report on Form 8-K filed by Quartzsea Acquisition Corporation (the “Company”) with the Securities and Exchange Commission on June 16, 2026 (the “Original Filing”). The purpose of this Amendment No. 1 is to disclose that, in connection with the postponement of the Extraordinary General Meeting of Shareholders, the deadline for shareholders to exercise redemption rights has been extended to 5:00 p.m., Eastern Time, on June 18, 2026. Except as expressly set forth herein, this Amendment No. 1 does not amend, update or modify any other information contained in the Original Filing.