C3is Inc.

Registration statement for securities of certain foreign private issuers

Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

A new registration statement filed under Rule 462(b) to add securities to a prior related effective registration statement filed on Form F-1

Notice of Effectiveness

A correspondence can be sent as a document with another submission type or can be sent as a separate submission.

A correspondence can be sent as a document with another submission type or can be sent as a separate submission.

Registration statement for securities of certain foreign private issuers

Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

S.H.N. Financial Investments Ltd.: Major Shareholders

L1 Capital Global Opportunities Master Fund, Ltd.: Major Shareholders

S.H.N. Financial Investments Ltd.: Major Shareholders

Flawless Management Inc.: Major Shareholders

Imperial Petroleum Inc./Marshall Islands: Major Shareholders

Flawless Management Inc.: Major Shareholders

Imperial Petroleum Inc./Marshall Islands: Major Shareholders

Prospectus filed pursuant to Rule 424(b)(3)

Prospectus filed pursuant to Rule 424(b)(4)

Prospectus filed pursuant to Rule 424(b)(3)

Draft registration statement submitted by Emerging Growth Company under Securities Act Section 6(e) or by Foreign Private Issuer under Division of Corporation Finance policy

Prospectus filed pursuant to Rule 424(b)(3)

Prospectus filed pursuant to Rule 424(b)(3)

Initial registration statement for securities to be offered to employees pursuant to employee benefit plans

Prospectus filed pursuant to Rule 424(b)(3)

Prospectus filed pursuant to Rule 424(b)(3)

Prospectus filed pursuant to Rule 424(b)(4)