Company: QSEA
Filing Date: 2025-03-17
Form Type: S-1MEF
Source: 0001829126-25-001848
Chunk: 1

Company: Quartzsea Acquisition Corp
Filing Date: 2025-03-17
Form: S-1MEF
Chunk 1
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 Securities
Act registration statement number of the earlier effective registration statement for the same offering. ☒ 333-285152

If this Form is a post-effective amendment filed
pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number
of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed
pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number
of the earlier effective registration statement for the same offering. ☐

Indicate by check mark whether the registrant
is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company.
See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company”
and “emerging growth company” in Rule 12b-2 of the Securities Exchange Act of 1934, as amended.

| Large accelerated filer | ☐ | Accelerated filer         | ☐ |
| Non-accelerated filer   | ☒ | Smaller reporting company | ☒ |
|                         |   | Emerging growth company   | ☒ |

If an emerging growth company that prepares its
financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition
period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities
Act. ☐

This registration statement shall become effective upon filing with the Securities and Exchange Commission in accordance with Rule 462(b) under the Securities Act of 1933, as amended.

<div align='center'>EXPLANATORY NOTE</div>

This Registration Statement
on Form S-1 is being filed by Quartzsea Acquisition Corporation, a blank check company incorporated as a Cayman Islands exempted
company with limited liability (the “Registrant”), pursuant to Rule 462(b) under the Securities Act of 1933,
as amended. This Registration Statement incorporates by reference the contents of, including all exhibits to, the Registrant’s
Registration Statement on Form S-1 (File No. 333-285152), initially filed by the Registrant on February 24, 2025, as amended.

This Registration Statement
covers the registration of an additional 1