C3is Inc.

Symbol
CISS on Nasdaq
Industry
Deep Sea Foreign Transportation Of Freight (Office Of Energy & Transportation)
Business address
331 Kifissias Avenue, Erithrea, Athens, Greece, 14561
State of incorporation
Marshall Islands
Fiscal year end
31 December
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C3is Inc. has filed 205 SEC EDGAR filings since 07 Dec 2022

Latest Filings

Form type Document Filing Description Filing date Reporting date File number(s)
SCHEDULE 13G Open Document Open Filing 08 Jan 2026 005-94125
SCHEDULE 13D/A Open Document Open Filing 30 Dec 2025 005-94125
424B3 Open Document Open Filing 424B3 19 Dec 2025 333-290011
424B3 Open Document Open Filing 424B3 19 Dec 2025 333-272939
424B3 Open Document Open Filing 424B3 19 Dec 2025 333-276868
424B3 Open Document Open Filing 424B3 19 Dec 2025 333-276430
6-K Open Document Open Filing 6-K 19 Dec 2025 19 Dec 2025 001-41717
EFFECT Open Document Open Filing 18 Dec 2025 333-276868
EFFECT Open Document Open Filing 18 Dec 2025 333-276430
EFFECT Open Document Open Filing 18 Dec 2025 333-272939
SCHEDULE 13G Open Document Open Filing 18 Dec 2025 005-94125
SCHEDULE 13G Open Document Open Filing 17 Dec 2025 005-94125
POS AM Open Document Open Filing POS AM 15 Dec 2025 333-272939
POS AM Open Document Open Filing POS AM 15 Dec 2025 333-276430
POS AM Open Document Open Filing POS AM 15 Dec 2025 333-276868
SCHEDULE 13D/A Open Document Open Filing 15 Dec 2025 005-94125
6-K Open Document Open Filing 6-K 12 Dec 2025 12 Dec 2025 001-41717
424B4 Open Document Open Filing 424B4 11 Dec 2025 333-290011
EFFECT Open Document Open Filing 10 Dec 2025 333-290011
F-1/A Open Document Open Filing F-1/A 05 Dec 2025 333-290011
EFFECT Open Document Open Filing 21 Nov 2025 333-276868
6-K Open Document Open Filing 6-K 18 Nov 2025 18 Nov 2025 001-41717
SCHEDULE 13G/A Open Document Open Filing 14 Nov 2025 005-94125
F-1/A Open Document Open Filing F-1/A 03 Nov 2025 333-290011
SCHEDULE 13G Open Document Open Filing 28 Oct 2025 005-94125
SCHEDULE 13D/A Open Document Open Filing 10 Oct 2025 005-94125
SCHEDULE 13D/A Open Document Open Filing 10 Oct 2025 005-94125
6-K Open Document Open Filing 6-K 09 Oct 2025 09 Oct 2025 001-41717
424B5 Open Document Open Filing 424B5 09 Oct 2025 333-285135
SCHEDULE 13G/A Open Document Open Filing 02 Oct 2025 005-94125
SCHEDULE 13D/A Open Document Open Filing 01 Oct 2025 005-94125
POS AM Open Document Open Filing POS AM 01 Oct 2025 333-276868
POS AM Open Document Open Filing POS AM 01 Oct 2025 333-272939
POS AM Open Document Open Filing POS AM 01 Oct 2025 333-276430
SCHEDULE 13G/A Open Document Open Filing 29 Sep 2025 005-94125
6-K Open Document | Data Open Filing 6-K 29 Sep 2025 30 Jun 2025 001-41717
SCHEDULE 13G Open Document Open Filing 24 Sep 2025 005-94125
F-1 Open Document | Data Open Filing F-1 03 Sep 2025 333-290011
424B3 Open Document Open Filing 424B3 02 Sep 2025 333-272939
424B3 Open Document Open Filing 424B3 02 Sep 2025 333-276868
424B3 Open Document Open Filing 424B3 02 Sep 2025 333-276430
6-K Open Document Open Filing 6-K 02 Sep 2025 02 Sep 2025 001-41717
6-K Open Document Open Filing 6-K 29 Aug 2025 29 Aug 2025 001-41717
DRS Open Document Open Filing 21 Jul 2025 377-08236
6-K Open Document Open Filing 6-K 25 Jun 2025 25 Jun 2025 001-41717
424B3 Open Document Open Filing 424B3 16 May 2025 333-276430
424B3 Open Document Open Filing 424B3 16 May 2025 333-272939
424B3 Open Document Open Filing 424B3 16 May 2025 333-276868
6-K Open Document Open Filing 6-K 16 May 2025 16 May 2025 001-41717
EFFECT Open Document Open Filing 05 May 2025 333-276868
EFFECT Open Document Open Filing 05 May 2025 333-276430
EFFECT Open Document Open Filing 05 May 2025 333-272939
POS AM Open Document Open Filing POS AM 30 Apr 2025 333-276430
POS AM Open Document Open Filing POS AM 30 Apr 2025 333-272939
POS AM Open Document Open Filing POS AM 30 Apr 2025 333-276868
20-F Open Document | Data Open Filing 20-F 28 Apr 2025 31 Dec 2024 001-41717
SCHEDULE 13D/A Open Document Open Filing 15 Apr 2025 005-94125
424B3 Open Document Open Filing 424B3 04 Apr 2025 333-272939
424B3 Open Document Open Filing 424B3 04 Apr 2025 333-276868
424B3 Open Document Open Filing 424B3 04 Apr 2025 333-276430
6-K Open Document Open Filing 6-K 04 Apr 2025 04 Apr 2025 001-41717
424B3 Open Document Open Filing 424B3 02 Apr 2025 333-272939
424B3 Open Document Open Filing 424B3 02 Apr 2025 333-276868
424B3 Open Document Open Filing 424B3 02 Apr 2025 333-276430
6-K Open Document Open Filing 6-K 02 Apr 2025 02 Apr 2025 001-41717
424B3 Open Document Open Filing 424B3 12 Mar 2025 333-272939
424B3 Open Document Open Filing 424B3 12 Mar 2025 333-276868
424B3 Open Document Open Filing 424B3 12 Mar 2025 333-276430
6-K Open Document Open Filing 6-K 12 Mar 2025 12 Mar 2025 001-41717
EFFECT Open Document Open Filing 06 Mar 2025 333-285135
CORRESP Open Document Open Filing 04 Mar 2025
UPLOAD Open Document Open Filing 03 Mar 2025 333-285135
F-3 Open Document Open Filing F-3 21 Feb 2025 333-285135
6-K Open Document Open Filing 6-K 21 Feb 2025 21 Feb 2025 001-41717
6-K Open Document Open Filing 6-K 18 Feb 2025 18 Feb 2025 001-41717
SCHEDULE 13G/A Open Document Open Filing 14 Feb 2025 005-94125
SCHEDULE 13D/A Open Document Open Filing 14 Jan 2025 005-94125
424B3 Open Document Open Filing 424B3 02 Jan 2025 333-276868
424B3 Open Document Open Filing 424B3 02 Jan 2025 333-276430
424B3 Open Document Open Filing 424B3 02 Jan 2025 333-272939
6-K Open Document Open Filing 6-K 02 Jan 2025 02 Jan 2025 001-41717
EFFECT Open Document Open Filing 13 Dec 2024 333-276430
EFFECT Open Document Open Filing 13 Dec 2024 333-276868
EFFECT Open Document Open Filing 13 Dec 2024 333-272939
POS AM Open Document Open Filing POS AM 10 Dec 2024 333-272939
POS AM Open Document Open Filing POS AM 10 Dec 2024 333-276868
POS AM Open Document Open Filing POS AM 10 Dec 2024 333-276430
424B3 Open Document Open Filing 424B3 19 Nov 2024 333-272939
424B3 Open Document Open Filing 424B3 19 Nov 2024 333-276868
424B3 Open Document Open Filing 424B3 19 Nov 2024 333-276430
6-K Open Document Open Filing 6-K 19 Nov 2024 19 Nov 2024 001-41717
424B3 Open Document Open Filing 424B3 30 Sep 2024 333-272939
424B3 Open Document Open Filing 424B3 30 Sep 2024 333-276868
424B3 Open Document Open Filing 424B3 30 Sep 2024 333-276430
6-K Open Document | Data Open Filing 6-K 30 Sep 2024 30 Jun 2024 001-41717
SC 13D/A Open Document Open Filing SC 13D/A 18 Sep 2024 005-94125
6-K Open Document Open Filing 6-K 30 Aug 2024 30 Aug 2024 001-41717
6-K Open Document Open Filing 6-K 23 Aug 2024 23 Aug 2024 001-41717
SC 13D/A Open Document Open Filing SC 13D/A 24 Jun 2024 005-94125
424B3 Open Document Open Filing 424B3 28 May 2024 333-276868
424B3 Open Document Open Filing 424B3 28 May 2024 333-276430
424B3 Open Document Open Filing 424B3 28 May 2024 333-272939
6-K Open Document Open Filing 6-K 28 May 2024 28 May 2024 001-41717
SC 13G Open Document Open Filing SC 13G 24 May 2024 005-94125
SC 13D Open Document Open Filing SC 13D 20 May 2024 005-94125
EFFECT Open Document Open Filing 08 May 2024 333-272939
EFFECT Open Document Open Filing 08 May 2024 333-276430
EFFECT Open Document Open Filing 08 May 2024 333-276868
SC 13D/A Open Document Open Filing SC 13D/A 01 May 2024 005-94125
POS AM Open Document Open Filing POS AM 01 May 2024 333-276868
POS AM Open Document Open Filing POS AM 01 May 2024 333-276430
POS AM Open Document Open Filing POS AM 01 May 2024 333-272939
20-F Open Document | Data Open Filing 20-F 30 Apr 2024 31 Dec 2023 001-41717
424B3 Open Document Open Filing 424B3 12 Apr 2024 333-276868
424B3 Open Document Open Filing 424B3 12 Apr 2024 333-276430
424B3 Open Document Open Filing 424B3 12 Apr 2024 333-272939
6-K Open Document Open Filing 6-K 12 Apr 2024 12 Apr 2024 001-41717
424B3 Open Document Open Filing 424B3 12 Apr 2024 333-276868
424B3 Open Document Open Filing 424B3 12 Apr 2024 333-276430
424B3 Open Document Open Filing 424B3 12 Apr 2024 333-272939
6-K Open Document Open Filing 6-K 12 Apr 2024 12 Apr 2024 001-41717
424B3 Open Document Open Filing 424B3 26 Mar 2024 333-276868
424B3 Open Document Open Filing 424B3 26 Mar 2024 333-276430
424B3 Open Document Open Filing 424B3 26 Mar 2024 333-272939
6-K Open Document Open Filing 6-K 26 Mar 2024 26 Mar 2024 001-41717
SC 13G Open Document Open Filing SCHEDULE 13G 25 Mar 2024 005-94125
SC 13D/A Open Document Open Filing SC 13D/A 20 Mar 2024 005-94125
424B3 Open Document Open Filing 424B3 19 Mar 2024 333-276868
424B3 Open Document Open Filing 424B3 19 Mar 2024 333-276430
424B3 Open Document Open Filing 424B3 19 Mar 2024 333-272939
6-K Open Document Open Filing 6-K 19 Mar 2024 19 Mar 2024 001-41717
424B3 Open Document Open Filing 424B3 15 Mar 2024 333-276868
424B3 Open Document Open Filing 424B3 15 Mar 2024 333-276430
424B3 Open Document Open Filing 424B3 15 Mar 2024 333-272939
6-K Open Document Open Filing 6-K 15 Mar 2024 15 Mar 2024 001-41717
424B4 Open Document Open Filing 424B4 15 Mar 2024 333-276868
EFFECT Open Document Open Filing 14 Mar 2024 333-276868
CORRESP Open Document Open Filing 14 Mar 2024
CORRESP Open Document Open Filing 14 Mar 2024
CORRESP Open Document Open Filing 14 Mar 2024
CORRESP Open Document Open Filing 14 Mar 2024
CORRESP Open Document Open Filing 11 Mar 2024
CORRESP Open Document Open Filing 11 Mar 2024
CORRESP Open Document Open Filing 23 Feb 2024
F-1/A Open Document Open Filing F-1/A 23 Feb 2024 333-276868
UPLOAD Open Document Open Filing 22 Feb 2024 333-276868
424B3 Open Document Open Filing 424B3 22 Feb 2024 333-276430
424B3 Open Document Open Filing 424B3 22 Feb 2024 333-272939
6-K Open Document Open Filing FORM 6-K 22 Feb 2024 22 Feb 2024 001-41717
SC 13G Open Document Open Filing 13-G 09 Feb 2024 005-94125
F-1 Open Document Open Filing F-1 05 Feb 2024 333-276868
SC 13G Open Document Open Filing SCHEDULE 13G 29 Jan 2024 005-94125
SC 13G Open Document Open Filing SCHEDULE 13G 29 Jan 2024 005-94125
SC 13D/A Open Document Open Filing SC 13D/A 24 Jan 2024 005-94125
SC 13D/A Open Document Open Filing SC 13D/A 24 Jan 2024 005-94125
424B3 Open Document Open Filing 424B3 23 Jan 2024 333-272939
6-K Open Document Open Filing 6-K 23 Jan 2024 23 Jan 2024 001-41717
424B4 Open Document Open Filing 424B4 22 Jan 2024 333-276430
F-1MEF Open Document Open Filing F-1MEF 19 Jan 2024 333-276597
EFFECT Open Document Open Filing 18 Jan 2024 333-276430
CORRESP Open Document Open Filing 17 Jan 2024
CORRESP Open Document Open Filing 17 Jan 2024
UPLOAD Open Document Open Filing 16 Jan 2024 333-276430
F-1 Open Document Open Filing F-1 08 Jan 2024 333-276430
SC 13D Open Document Open Filing SC 13D 16 Nov 2023 005-94125
424B3 Open Document Open Filing 424B3 06 Nov 2023 333-272939
6-K Open Document Open Filing 6-K 06 Nov 2023 06 Nov 2023 001-41717
DRS Open Document Open Filing 29 Sep 2023 377-06902
424B3 Open Document Open Filing 424B3 29 Sep 2023 333-272939
6-K Open Document Open Filing 6-K 29 Sep 2023 29 Sep 2023 001-41717
6-K Open Document Open Filing 6-K 08 Sep 2023 08 Sep 2023 001-41717
424B3 Open Document Open Filing 424B3 25 Aug 2023 333-272939
6-K Open Document Open Filing 6-K 25 Aug 2023 25 Aug 2023 001-41717
SC 13D Open Document Open Filing SC 13D 28 Jul 2023 005-94125
S-8 Open Document Open Filing S-8 18 Jul 2023 333-273306
424B3 Open Document Open Filing 424B3 17 Jul 2023 333-272939
6-K Open Document Open Filing 6-K 17 Jul 2023 17 Jul 2023 001-41717
424B3 Open Document Open Filing 424B3 05 Jul 2023 333-272939
6-K Open Document Open Filing 6-K 05 Jul 2023 05 Jul 2023 001-41717
424B4 Open Document Open Filing 424B4 03 Jul 2023 333-272939
EFFECT Open Document Open Filing 30 Jun 2023 333-272939
CORRESP Open Document Open Filing 28 Jun 2023
CORRESP Open Document Open Filing 28 Jun 2023
F-1 Open Document Open Filing F-1 26 Jun 2023 333-272939
UPLOAD Open Document Open Filing 26 Jun 2023
6-K Open Document Open Filing 6-K 23 Jun 2023 23 Jun 2023 001-41717
DRS Open Document Open Filing 14 Jun 2023 377-06747
EFFECT Open Document Open Filing 12 Jun 2023 333-271228
424B1 Open Document Open Filing 424B1 12 Jun 2023 333-271228
CERT Open Document Open Filing 12 Jun 2023 001-41717
CORRESP Open Document Open Filing 08 Jun 2023
8-A12B Open Document Open Filing 8-A12B 08 Jun 2023 001-41717
CORRESP Open Document Open Filing 06 Jun 2023
F-1/A Open Document Open Filing F-1/A 06 Jun 2023 333-271228
UPLOAD Open Document Open Filing 01 Jun 2023
CORRESP Open Document Open Filing 17 May 2023
F-1/A Open Document Open Filing F-1/A 17 May 2023 333-271228
UPLOAD Open Document Open Filing 28 Apr 2023
CORRESP Open Document Open Filing 12 Apr 2023
F-1 Open Document Open Filing F-1 12 Apr 2023 333-271228
UPLOAD Open Document Open Filing 13 Feb 2023
DRSLTR Open Document Open Filing 25 Jan 2023
DRS/A Open Document Open Filing 25 Jan 2023 377-06490
UPLOAD Open Document Open Filing 03 Jan 2023
DRS Open Document Open Filing 07 Dec 2022 377-06490