C3is CISS SEC Filings

NASDAQ CISS
$0.56 +0.02 (+2.91%)
At close: Oct 20, 2026 · 4:00 PM EDT
EDGAR Disclosures

SEC Filings

Source SEC EDGAR

Every SEC filing C3is Inc. (CISS) has made, as reported on EDGAR — annual and quarterly reports, current reports, insider transactions and ownership disclosures. Filter by form group, form type or period, and open any filing or its index directly.

Form Type
# Form Type Form Group Accession Date Filing Index
1POS AMOthers0001193125-26-414249Oct 5, 2026 4:35 PM
2POS AMOthers0001193125-26-414232Oct 5, 2026 4:31 PM
3POS AMOthers0001193125-26-414205Oct 5, 2026 4:27 PM
4SCHEDULE 13G/AOthers0001753926-26-001894Oct 5, 2026 6:07 AM
56-KCurrent Report0001193125-26-405908Sep 29, 2026 6:05 AM
6SCHEDULE 13GBeneficial Ownership Report0001235976-26-000001Sep 3, 2026 2:06 PM
7424B3Prospectus0001193125-26-369646Aug 27, 2026 12:16 PM
8424B3Prospectus0001193125-26-369643Aug 27, 2026 12:15 PM
9424B3Prospectus0001193125-26-369642Aug 27, 2026 12:14 PM
10424B3Prospectus0001193125-26-369641Aug 27, 2026 12:12 PM
11424B3Prospectus0001193125-26-369639Aug 27, 2026 12:11 PM
126-KCurrent Report0001193125-26-369519Aug 27, 2026 11:05 AM
13424B3Prospectus0001193125-26-357115Aug 19, 2026 9:05 PM
14424B3Prospectus0001193125-26-357102Aug 19, 2026 9:03 PM
15424B3Prospectus0001193125-26-357093Aug 19, 2026 9:00 PM
16424B3Prospectus0001193125-26-357080Aug 19, 2026 8:57 PM
17424B3Prospectus0001193125-26-357073Aug 19, 2026 8:54 PM
18SCHEDULE 13GBeneficial Ownership Report0001595888-26-000109Aug 19, 2026 8:15 PM
196-KCurrent Report0001193125-26-356854Aug 19, 2026 8:01 PM
206-KCurrent Report0001193125-26-354028Aug 17, 2026 4:05 PM
21SCHEDULE 13GBeneficial Ownership Report0001753926-26-001328Aug 4, 2026 12:47 AM
22SCHEDULE 13GBeneficial Ownership Report0001094891-26-000264Aug 3, 2026 8:19 PM
23SCHEDULE 13GBeneficial Ownership Report0001649553-26-000076Aug 3, 2026 7:00 PM
24SCHEDULE 13GBeneficial Ownership Report0000929638-26-002851Jul 31, 2026 8:30 PM
25SCHEDULE 13DBeneficial Ownership Report0001193125-26-326456Jul 30, 2026 11:00 PM
26424B3Prospectus0001193125-26-321283Jul 28, 2026 9:25 PM
27424B3Prospectus0001193125-26-321181Jul 28, 2026 8:53 PM
28424B3Prospectus0001193125-26-321178Jul 28, 2026 8:51 PM
29424B3Prospectus0001193125-26-321155Jul 28, 2026 8:48 PM
30424B3Prospectus0001193125-26-321146Jul 28, 2026 8:46 PM
31424B3Prospectus0001193125-26-321141Jul 28, 2026 8:43 PM
326-KCurrent Report0001193125-26-320953Jul 28, 2026 8:02 PM
33424B4Prospectus0001193125-26-318972Jul 28, 2026 12:49 PM
34EFFECTOthers9999999995-26-002470Jul 27, 2026 4:15 AM
356-KCurrent Report0001193125-26-317019Jul 27, 2026 1:25 PM
36F-1Prospectus0001193125-26-314070Jul 23, 2026 8:02 PM
37F-1Prospectus0001193125-26-312562Jul 22, 2026 9:16 PM
386-KCurrent Report0001193125-26-312537Jul 22, 2026 9:01 PM
39SCHEDULE 13DBeneficial Ownership Report0001193125-26-281039Jun 24, 2026 8:05 PM
406-KCurrent Report0001193125-26-277660Jun 22, 2026 9:00 PM
41SCHEDULE 13GBeneficial Ownership Report0001166573-26-000001May 18, 2026 3:21 PM
42424B3Prospectus0001193125-26-228046May 18, 2026 9:17 AM
43424B3Prospectus0001193125-26-228043May 18, 2026 9:15 AM
44424B3Prospectus0001193125-26-228040May 18, 2026 9:14 AM
45424B3Prospectus0001193125-26-228036May 18, 2026 9:13 AM
466-KCurrent Report0001193125-26-228033May 18, 2026 9:11 AM
47EFFECTOthers9999999995-26-001603May 13, 2026 12:15 AM-
48EFFECTOthers9999999995-26-001600May 13, 2026 12:15 AM-
49EFFECTOthers9999999995-26-001599May 13, 2026 12:15 AM-
50EFFECTOthers9999999995-26-001598May 13, 2026 12:15 AM-
...

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