<SEC-DOCUMENT>0001193125-25-226737-index.html : 20251001
<SEC-HEADER>0001193125-25-226737.hdr.sgml : 20251001
<ACCEPTANCE-DATETIME>20251001160412
ACCESSION NUMBER:		0001193125-25-226737
CONFORMED SUBMISSION TYPE:	POS AM
PUBLIC DOCUMENT COUNT:		5
FILED AS OF DATE:		20251001
DATE AS OF CHANGE:		20251001

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
		EIN:				000000000
		STATE OF INCORPORATION:			1T
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		POS AM
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-276430
		FILM NUMBER:		251364616

	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>POS AM
<SEQUENCE>1
<FILENAME>d74751dposam.htm
<DESCRIPTION>POS AM
<TEXT>
Document 1 - file: d74751dposam.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>2
<FILENAME>d74751dex231.htm
<DESCRIPTION>EX-23.1
<TEXT>
Document 2 - file: d74751dex231.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.2
<SEQUENCE>3
<FILENAME>d74751dex232.htm
<DESCRIPTION>EX-23.2
<TEXT>
Document 3 - file: d74751dex232.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g74751g1001084304495.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g74751g1001084304495.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g74751g1001084304651.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g74751g1001084304651.jpg

</DOCUMENT>
</SEC-DOCUMENT>