Form 424B3 C3is Inc.
Filed Pursuant to Rule 424(b)(3)
Registration No. 333-290011
PROSPECTUS SUPPLEMENT NO. 4
(TO PROSPECTUS DATED MAY 13, 2026)
C3IS INC.
This is a supplement (“Prospectus Supplement”) to the prospectus, dated May 13, 2026 (“Prospectus”), of C3is Inc. (the “Company”), which forms a part of the Company’s Registration Statement on Form F-1 (Registration No. 333-290011), as amended or supplemented from time to time. This Prospectus Supplement is being filed to... (continue reading...)
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