<SEC-DOCUMENT>0001193125-25-052580-index.html : 20250312
<SEC-HEADER>0001193125-25-052580.hdr.sgml : 20250312
<ACCEPTANCE-DATETIME>20250312090149
ACCESSION NUMBER:		0001193125-25-052580
CONFORMED SUBMISSION TYPE:	424B3
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20250312
DATE AS OF CHANGE:		20250312

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			C3is Inc.
		CENTRAL INDEX KEY:			0001951067
		STANDARD INDUSTRIAL CLASSIFICATION:	DEEP SEA FOREIGN TRANSPORTATION OF FREIGHT [4412]
		ORGANIZATION NAME:           	01 Energy & Transportation
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			1T
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-276868
		FILM NUMBER:		25730130

	BUSINESS ADDRESS:	
		STREET 1:		331 KIFISSIAS AVENUE
		STREET 2:		ERITHREA
		CITY:			ATHENS
		STATE:			J3
		ZIP:			14561
		BUSINESS PHONE:		011-30-210-625-0001

	MAIL ADDRESS:	
		STREET 1:		331 KIFISSIAS AVENUE
		STREET 2:		ERITHREA
		CITY:			ATHENS
		STATE:			J3
		ZIP:			14561
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B3
<SEQUENCE>1
<FILENAME>d925998d424b3.htm
<DESCRIPTION>424B3
<TEXT>
Document 1 - file: d925998d424b3.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g925998g81d21.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g925998g81d21.jpg

</DOCUMENT>
</SEC-DOCUMENT>