Castor Maritime Inc.

Symbol
CTRM on Nasdaq
Business address
Christodoulou Chatzipavlou 223, HawaII Royal Gardens, Apart. 16, Limassol, Cyprus, 3036
Top holdings (ownership)
EGLE
State of incorporation
Marshall Islands
Fiscal year end
31 December
Get insider transactions for this reporting owner
Castor Maritime Inc. has filed 283 SEC EDGAR filings since 01 Dec 2017

Latest Filings

Form type Document Filing Description Filing date Reporting date File number(s)
6-K Open Document Open Filing 6-K 05 Jan 2026 05 Jan 2026 001-38802
6-K Open Document Open Filing 6-K 29 Dec 2025 29 Dec 2025 001-38802
6-K Open Document Open Filing 6-K 03 Dec 2025 03 Dec 2025 001-38802
6-K Open Document Open Filing 6-K 15 Oct 2025 15 Oct 2025 001-38802
6-K Open Document | Data Open Filing 6-K 01 Oct 2025 30 Jun 2025 001-38802
6-K Open Document Open Filing 6-K 01 Oct 2025 01 Oct 2025 001-38802
6-K Open Document Open Filing 6-K 15 Sep 2025 15 Sep 2025 001-38802
6-K Open Document Open Filing 6-K 11 Aug 2025 11 Aug 2025 001-38802
6-K Open Document Open Filing 6-K 30 Jul 2025 30 Jul 2025 001-38802
6-K Open Document Open Filing 6-K 29 Jul 2025 29 Jul 2025 001-38802
6-K Open Document Open Filing 6-K 07 Jul 2025 07 Jul 2025 001-38802
20-F Open Document | Data Open Filing 20-F 14 May 2025 31 Dec 2024 001-38802
6-K Open Document Open Filing 6-K 14 May 2025 14 May 2025 001-38802
NT 20-F Open Document Open Filing NT 20-F 30 Apr 2025 31 Dec 2024 001-38802
6-K Open Document Open Filing 6-K 21 Mar 2025 21 Mar 2025 001-38802
6-K Open Document Open Filing 6-K 14 Feb 2025 14 Feb 2025 001-38802
6-K Open Document Open Filing 6-K 19 Dec 2024 19 Dec 2024 001-38802
6-K Open Document Open Filing 6-K 17 Dec 2024 17 Dec 2024 001-38802
6-K Open Document Open Filing 6-K 12 Dec 2024 12 Dec 2024 001-38802
6-K Open Document Open Filing 6-K 02 Dec 2024 02 Dec 2024 001-38802
6-K Open Document Open Filing 6-K 07 Nov 2024 07 Nov 2024 001-38802
6-K Open Document Open Filing 6-K 07 Nov 2024 07 Nov 2024 001-38802
6-K Open Document Open Filing 6-K 30 Sep 2024 30 Sep 2024 001-38802
6-K Open Document Open Filing 6-K 10 Sep 2024 10 Sep 2024 001-38802
6-K Open Document Open Filing 6-K 09 Sep 2024 09 Sep 2024 001-38802
6-K Open Document | Data Open Filing 6-K 08 Aug 2024 30 Jun 2024 001-38802
6-K Open Document Open Filing 6-K 08 Aug 2024 08 Aug 2024 001-38802
6-K Open Document Open Filing 6-K 06 Aug 2024 06 Aug 2024 001-38802
6-K Open Document Open Filing 6-K 25 Jul 2024 25 Jul 2024 001-38802
6-K Open Document Open Filing FORM 6-K 03 Jun 2024 03 Jun 2024 001-38802
SC TO-I/A Open Document Open Filing SC TO-I/A 03 Jun 2024 005-90917
6-K Open Document Open Filing 6-K 16 May 2024 16 May 2024 001-38802
6-K Open Document Open Filing 6-K 16 May 2024 16 May 2024 001-38802
CORRESP Open Document Open Filing 16 May 2024
SC TO-I/A Open Document Open Filing SC TOI/A 16 May 2024 005-90917
UPLOAD Open Document Open Filing 30 Apr 2024 005-90917
SC TO-I/A Open Document Open Filing SC TO-I/A 22 Apr 2024 005-90917
6-K Open Document Open Filing 6K 22 Apr 2024 22 Apr 2024 001-38802
SC TO-I Open Document Open Filing SC TO-I 22 Apr 2024 005-90917
6-K Open Document Open Filing 6-K 15 Apr 2024 15 Apr 2024 001-38802
4 Open Document Open Filing FORM 4 05 Apr 2024 03 Apr 2024 001-33831
6-K Open Document Open Filing 6-K 29 Mar 2024 29 Mar 2024 001-38802
8-A12B/A Open Document Open Filing 8-A12B/A 27 Mar 2024 001-38802
6-K Open Document Open Filing 6-K 22 Mar 2024 22 Mar 2024 001-38802
20-F Open Document | Data Open Filing 20-F 29 Feb 2024 31 Dec 2023 001-38802
6-K Open Document Open Filing 6-K 22 Feb 2024 22 Feb 2024 001-38802
6-K Open Document Open Filing 6-K 08 Feb 2024 08 Feb 2024 001-38802
6-K Open Document Open Filing 6-K 29 Jan 2024 29 Jan 2024 001-38802
6-K Open Document Open Filing 6-K 05 Jan 2024 05 Jan 2024 001-38802
6-K Open Document Open Filing 6-K 18 Dec 2023 18 Dec 2023 001-38802
6-K Open Document Open Filing 6-K 28 Nov 2023 28 Nov 2023 001-38802
6-K Open Document Open Filing 6-K 09 Nov 2023 09 Nov 2023 001-38802
6-K Open Document Open Filing 6-K 08 Nov 2023 08 Nov 2023 001-38802
6-K Open Document Open Filing 6-K 08 Nov 2023 08 Nov 2023 001-38802
6-K Open Document Open Filing 6-K 23 Oct 2023 23 Oct 2023 001-38802
6-K Open Document Open Filing 6-K 19 Oct 2023 19 Oct 2023 001-38802
6-K Open Document Open Filing 6-K 06 Oct 2023 06 Oct 2023 001-38802
6-K Open Document Open Filing 6-K 26 Sep 2023 26 Sep 2023 001-38802
6-K Open Document Open Filing 6-K 05 Sep 2023 05 Sep 2023 001-38802
6-K Open Document | Data Open Filing 6-K 08 Aug 2023 30 Jun 2023 001-38802
6-K Open Document Open Filing 6-K 08 Aug 2023 08 Aug 2023 001-38802
6-K Open Document Open Filing 6-K 08 Aug 2023 08 Aug 2023 001-38802
6-K Open Document Open Filing 6-K 31 Jul 2023 31 Jul 2023 001-38802
3 Open Document Open Filing 30 Jun 2023 23 Jun 2023 001-33831
SC 13G Open Document Open Filing SC 13G 30 Jun 2023
6-K Open Document Open Filing 6-K 15 Jun 2023 08 Jun 2023 001-38802
6-K Open Document Open Filing 6-K 23 May 2023 23 May 2023 001-38802
424B5 Open Document Open Filing 424B5 23 May 2023 333-254977
6-K Open Document Open Filing 6-K 23 May 2023 23 May 2023 001-38802
6-K Open Document Open Filing 6-K 23 May 2023 23 May 2023 001-38802
6-K Open Document Open Filing 6-K 24 Apr 2023 24 Apr 2023 001-38802
6-K Open Document Open Filing 6-K 19 Apr 2023 19 Apr 2023 001-38802
6-K Open Document Open Filing 6-K 03 Apr 2023 03 Apr 2023 001-38802
6-K Open Document Open Filing 6-K 20 Mar 2023 20 Mar 2023 001-38802
6-K Open Document Open Filing 6-K 08 Mar 2023 08 Mar 2023 001-38802
20-F Open Document | Data Open Filing 20-F 08 Mar 2023 31 Dec 2022 001-38802
6-K Open Document Open Filing 6-K 08 Mar 2023 08 Mar 2023 001-38802
6-K Open Document Open Filing 6-K 13 Feb 2023 13 Feb 2023 001-38802
6-K Open Document Open Filing 6-K 02 Feb 2023 02 Feb 2023 001-38802
6-K Open Document Open Filing 6-K 30 Dec 2022 30 Dec 2022 001-38802
6-K Open Document Open Filing 6-K 16 Dec 2022 16 Dec 2022 001-38802
6-K Open Document Open Filing 6-K 14 Dec 2022 14 Dec 2022 001-38802
6-K Open Document Open Filing 6-K 01 Dec 2022 01 Dec 2022 001-38802
6-K Open Document Open Filing 6-K 23 Nov 2022 23 Nov 2022 001-38802
6-K Open Document Open Filing 6-K 23 Nov 2022 23 Nov 2022 001-38802
6-K Open Document Open Filing 6-K 16 Nov 2022 16 Nov 2022 001-38802
6-K Open Document Open Filing 6-K 08 Nov 2022 08 Nov 2022 001-38802
6-K Open Document | Data Open Filing 6-K 09 Aug 2022 30 Jun 2022 001-38802
6-K Open Document Open Filing 6-K 09 Aug 2022 09 Aug 2022 001-38802
6-K Open Document Open Filing 6-K 09 May 2022 09 May 2022 001-38802
6-K Open Document Open Filing 6-K 09 May 2022 06 May 2022 001-38802
6-K Open Document Open Filing 6-K 18 Apr 2022 18 Apr 2022 001-38802
EFFECT Open Document Open Filing 08 Apr 2022 333-254977
POS AM Open Document Open Filing POS AM 01 Apr 2022 333-254977
20-F Open Document | Data Open Filing 20-F 31 Mar 2022 31 Dec 2021 001-38802
POSASR Open Document Open Filing POSASR 31 Mar 2022 333-254977
6-K Open Document Open Filing 6-K 10 Mar 2022 10 Mar 2022 001-38802
SC 13G/A Open Document Open Filing AMENDMENT NO. 2 TO SCHEDULE 13G 11 Feb 2022 005-90917
6-K Open Document Open Filing 6-K 07 Feb 2022 07 Feb 2022 001-38802
SC 13G/A Open Document Open Filing CTRM 13G/A 04 Feb 2022 005-90917
SC 13G/A Open Document Open Filing CASTOR MARITIME INC. 18 Jan 2022 005-90917
6-K Open Document Open Filing 6-K 18 Jan 2022 18 Jan 2022 001-38802
6-K Open Document Open Filing 6-K 05 Jan 2022 05 Jan 2022 001-38802
6-K Open Document Open Filing 6-K 20 Dec 2021 20 Dec 2021 001-38802
6-K Open Document Open Filing 07 Dec 2021 31 Dec 2021 001-38802
6-K Open Document Open Filing 01 Dec 2021 31 Dec 2021 001-38802
6-K Open Document Open Filing 18 Nov 2021 30 Nov 2021 001-38802
6-K Open Document Open Filing 08 Nov 2021 30 Sep 2021 001-38802
6-K Open Document Open Filing 08 Nov 2021 30 Nov 2021 001-38802
6-K Open Document Open Filing 26 Oct 2021 31 Oct 2021 001-38802
6-K Open Document Open Filing 20 Oct 2021 31 Oct 2021 001-38802
6-K Open Document Open Filing 07 Oct 2021 31 Oct 2021 001-38802
6-K Open Document Open Filing 22 Sep 2021 30 Sep 2021 001-38802
6-K Open Document Open Filing 13 Sep 2021 30 Sep 2021 001-38802
6-K Open Document Open Filing 26 Aug 2021 31 Aug 2021 001-38802
6-K Open Document Open Filing 11 Aug 2021 31 Aug 2021 001-38802
6-K Open Document | Data Open Filing 6-K 05 Aug 2021 30 Jun 2021 001-38802
6-K Open Document Open Filing 30 Jul 2021 31 Jul 2021 001-38802
6-K Open Document Open Filing 28 Jul 2021 31 Jul 2021 001-38802
6-K Open Document Open Filing 24 Jun 2021 30 Jun 2021 001-38802
6-K Open Document Open Filing 17 Jun 2021 30 Jun 2021 001-38802
6-K Open Document Open Filing 15 Jun 2021 30 Jun 2021 001-38802
6-K Open Document Open Filing 15 Jun 2021 30 Jun 2021 001-38802
424B5 Open Document Open Filing 15 Jun 2021 333-254977
6-K Open Document Open Filing 09 Jun 2021 30 Jun 2021 001-38802
6-K Open Document Open Filing 03 Jun 2021 30 Jun 2021 001-38802
8-A12B Open Document Open Filing 28 May 2021 001-38802
6-K Open Document Open Filing 25 May 2021 31 May 2021 001-38802
6-K Open Document Open Filing 21 May 2021 31 May 2021 001-38802
6-K Open Document Open Filing 18 May 2021 31 May 2021 001-38802
6-K Open Document Open Filing 11 May 2021 31 May 2021 001-38802
6-K Open Document Open Filing 04 May 2021 31 May 2021 001-38802
6-K Open Document Open Filing 30 Apr 2021 30 Apr 2021 001-38802
6-K Open Document Open Filing 28 Apr 2021 30 Apr 2021 001-38802
6-K Open Document Open Filing 19 Apr 2021 30 Apr 2021 001-38802
6-K Open Document Open Filing 19 Apr 2021 30 Apr 2021 001-38802
6-K Open Document Open Filing 15 Apr 2021 30 Apr 2021 001-38802
6-K Open Document Open Filing 09 Apr 2021 30 Apr 2021 001-38802
6-K Open Document Open Filing 07 Apr 2021 30 Apr 2021 001-38802
424B5 Open Document Open Filing 07 Apr 2021 333-254977
F-3ASR Open Document Open Filing 01 Apr 2021 333-254977
RW Open Document Open Filing 30 Mar 2021 333-252443
20-F Open Document | Data Open Filing 30 Mar 2021 31 Dec 2020 001-38802
6-K Open Document Open Filing 23 Mar 2021 31 Mar 2021 001-38802
6-K Open Document Open Filing 19 Mar 2021 31 Mar 2021 001-38802
6-K Open Document Open Filing 12 Mar 2021 31 Mar 2021 001-38802
6-K Open Document Open Filing 10 Mar 2021 31 Mar 2021 001-38802
6-K Open Document Open Filing 03 Mar 2021 31 Mar 2021 001-38802
6-K Open Document Open Filing 18 Feb 2021 28 Feb 2021 001-38802
SC 13G/A Open Document Open Filing SC 13G/A 16 Feb 2021 005-90917
SC 13G/A Open Document Open Filing 12 Feb 2021 005-90917
6-K Open Document Open Filing 11 Feb 2021 28 Feb 2021 001-38802
SC 13G Open Document Open Filing CTRM 13G 09 Feb 2021 005-90917
6-K Open Document Open Filing 03 Feb 2021 28 Feb 2021 001-38802
6-K Open Document Open Filing 01 Feb 2021 28 Feb 2021 001-38802
SC 13G/A Open Document Open Filing AMENDMENT NO. 1 TO SCHEDULE 13G 29 Jan 2021 005-90917
6-K Open Document Open Filing 27 Jan 2021 31 Jan 2021 001-38802
F-3 Open Document Open Filing 27 Jan 2021 333-252443
6-K Open Document Open Filing 25 Jan 2021 31 Jan 2021 001-38802
6-K Open Document Open Filing 20 Jan 2021 31 Jan 2021 001-38802
SC 13G Open Document Open Filing CASTOR MARITIME INC. 13 Jan 2021 005-90917
6-K Open Document Open Filing 12 Jan 2021 31 Jan 2021 001-38802
424B5 Open Document Open Filing 11 Jan 2021 333-232052
F-3MEF Open Document Open Filing 08 Jan 2021 333-251957
SC 13G/A Open Document Open Filing SABBY 13G-A CTRM 1.06.21 06 Jan 2021 005-90917
6-K Open Document Open Filing 05 Jan 2021 31 Jan 2021 001-38802
424B5 Open Document Open Filing 04 Jan 2021 333-232052
6-K Open Document Open Filing 31 Dec 2020 31 Dec 2020 001-38802
6-K Open Document Open Filing 31 Dec 2020 31 Dec 2020 001-38802
6-K Open Document Open Filing 27 Nov 2020 30 Nov 2020 001-38802
6-K Open Document Open Filing 16 Nov 2020 30 Nov 2020 001-38802
6-K Open Document Open Filing 12 Nov 2020 30 Nov 2020 001-38802
6-K Open Document Open Filing 23 Oct 2020 31 Oct 2020 001-38802
6-K Open Document Open Filing 20 Oct 2020 31 Oct 2020 001-38802
6-K Open Document Open Filing 14 Oct 2020 31 Oct 2020 001-38802
6-K Open Document Open Filing 07 Oct 2020 31 Oct 2020 001-38802
6-K Open Document Open Filing 01 Oct 2020 31 Oct 2020 001-38802
EFFECT Open Document Open Filing 23 Sep 2020 333-240262
EFFECT Open Document Open Filing 23 Sep 2020 333-238990
CORRESP Open Document Open Filing 21 Sep 2020
POS AM Open Document Open Filing 17 Sep 2020 333-238990
F-3/A Open Document Open Filing 17 Sep 2020 333-240262
POS AM Open Document Open Filing 14 Sep 2020 333-238990
6-K Open Document | Data Open Filing 11 Sep 2020 30 Jun 2020 001-38802
POS AM Open Document Open Filing 21 Aug 2020 333-238990
424B3 Open Document Open Filing 14 Aug 2020 333-238990
6-K Open Document Open Filing 14 Aug 2020 31 Aug 2020 001-38802
CORRESP Open Document Open Filing 14 Aug 2020
UPLOAD Open Document Open Filing 12 Aug 2020
SC 13G/A Open Document Open Filing SC 13G/A 11 Aug 2020 005-90917
SC 13G/A Open Document Open Filing SC 13G/A 05 Aug 2020 005-90917
SC 13G/A Open Document Open Filing SC 13G/A 05 Aug 2020 005-90917
F-3 Open Document Open Filing 31 Jul 2020 333-240262
424B3 Open Document Open Filing 29 Jul 2020 333-238990
6-K Open Document Open Filing 29 Jul 2020 31 Jul 2020 001-38802
D Open Document Open Filing 21 Jul 2020 021-371510
SC 13G Open Document Open Filing CASTOR MARITIME INC. 17 Jul 2020 005-90917
6-K Open Document Open Filing 15 Jul 2020 31 Jul 2020 001-38802
424B5 Open Document Open Filing 15 Jul 2020 333-232052
SC 13G Open Document Open Filing SABBY 13G CTRM 7.13.20 13 Jul 2020 005-90917
424B3 Open Document Open Filing 09 Jul 2020 333-238990
6-K Open Document Open Filing 09 Jul 2020 31 Jul 2020 001-38802
SC 13G Open Document Open Filing SCHEDULE 13G 06 Jul 2020 005-90917
SC 13G Open Document Open Filing SCHEDULE 13G 06 Jul 2020 005-90917
424B3 Open Document Open Filing 30 Jun 2020 333-238990
6-K Open Document Open Filing 30 Jun 2020 30 Jun 2020 001-38802
424B3 Open Document Open Filing 30 Jun 2020 333-238990
SC 13G Open Document Open Filing SC 13G 30 Jun 2020 005-90917
6-K Open Document Open Filing 29 Jun 2020 30 Jun 2020 001-38802
424B1 Open Document Open Filing 25 Jun 2020 333-238990
EFFECT Open Document Open Filing 23 Jun 2020 333-238990
F-1MEF Open Document Open Filing 23 Jun 2020 333-239399
CORRESP Open Document Open Filing 23 Jun 2020
F-1/A Open Document Open Filing 23 Jun 2020 333-238990
F-1/A Open Document Open Filing 22 Jun 2020 333-238990
UPLOAD Open Document Open Filing 12 Jun 2020
F-1 Open Document Open Filing 05 Jun 2020 333-238990
6-K Open Document Open Filing 02 Jun 2020 30 Jun 2020 001-38802
6-K Open Document Open Filing 20 Apr 2020 30 Apr 2020 001-38802
6-K Open Document Open Filing 31 Mar 2020 31 Mar 2020 001-38802
20-F Open Document | Data Open Filing 31 Mar 2020 31 Dec 2019 001-38802
6-K Open Document Open Filing 26 Mar 2020 31 Mar 2020 001-38802
6-K Open Document Open Filing 04 Mar 2020 31 Mar 2020 001-38802
EFFECT Open Document Open Filing 19 Feb 2020 333-236331
424B3 Open Document Open Filing 19 Feb 2020 333-236331
CORRESP Open Document Open Filing 14 Feb 2020
UPLOAD Open Document Open Filing 14 Feb 2020
F-3 Open Document Open Filing 07 Feb 2020 333-236331
SC 13G/A Open Document Open Filing 06 Feb 2020 005-90917
SC 13G/A Open Document Open Filing 06 Feb 2020 005-90917
SC 13G/A Open Document Open Filing 06 Feb 2020 005-90917
6-K Open Document Open Filing 04 Feb 2020 29 Feb 2020 001-38802
6-K Open Document Open Filing 31 Jan 2020 31 Jan 2020 001-38802
6-K Open Document Open Filing 28 Jan 2020 31 Jan 2020 001-38802
6-K Open Document Open Filing 16 Dec 2019 31 Dec 2019 001-38802
6-K Open Document | Data Open Filing 16 Dec 2019 30 Sep 2019 001-38802
20-F Open Document | Data Open Filing 16 Dec 2019 31 Dec 2018 001-38802
6-K Open Document Open Filing 25 Nov 2019 30 Nov 2019 001-38802
6-K Open Document Open Filing 23 Oct 2019 31 Oct 2019 001-38802
6-K Open Document Open Filing 17 Oct 2019 31 Oct 2019 001-38802
6-K Open Document Open Filing 11 Oct 2019 31 Oct 2019 001-38802
6-K Open Document Open Filing 01 Oct 2019 31 Oct 2019 001-38802
6-K Open Document Open Filing 30 Sep 2019 30 Sep 2019 001-38802
6-K Open Document Open Filing 05 Sep 2019 30 Sep 2019 001-38802
6-K Open Document Open Filing 29 Jul 2019 31 Jul 2019 001-38802
6-K Open Document Open Filing 01 Jul 2019 31 Jul 2019 001-38802
424B5 Open Document Open Filing 01 Jul 2019 333-232052
6-K Open Document Open Filing 28 Jun 2019 30 Jun 2019 001-38802
EFFECT Open Document Open Filing 21 Jun 2019 333-232052
CORRESP Open Document Open Filing 19 Jun 2019
UPLOAD Open Document Open Filing 19 Jun 2019
F-3 Open Document Open Filing 10 Jun 2019 333-232052
6-K Open Document | Data Open Filing 04 Jun 2019 31 Mar 2019 001-38802
6-K Open Document Open Filing 04 Jun 2019 30 Jun 2019 001-38802
CERT Open Document Open Filing 25 Mar 2019 001-38802
8-A12B Open Document Open Filing 21 Mar 2019 001-38802
20-F/A Open Document | Data Open Filing 01 Mar 2019 30 Sep 2018 001-38802
SC 13G Open Document Open Filing 14 Feb 2019 005-90917
SC 13G Open Document Open Filing 14 Feb 2019 005-90917
SC 13G Open Document Open Filing 14 Feb 2019 005-90917
CERT Open Document Open Filing 08 Feb 2019 001-38802
8-A12B/A Open Document Open Filing 08 Feb 2019 001-38802
6-K Open Document Open Filing 07 Feb 2019 28 Feb 2019 001-38802
8-A12B Open Document Open Filing 06 Feb 2019 001-38802
20-F Open Document | Data Open Filing 31 Jan 2019 30 Sep 2018 000-55932
6-K Open Document Open Filing 21 Dec 2018 21 Dec 2018 000-55932
6-K Open Document Open Filing 30 Nov 2018 30 Nov 2018 000-55932
6-K Open Document Open Filing 21 Nov 2018 30 Nov 2018 000-55932
6-K Open Document Open Filing 18 Jun 2018 30 Jun 2018 000-55932
424B3 Open Document Open Filing 03 May 2018 333-224242
EFFECT Open Document Open Filing 02 May 2018 333-224242
8-A12G Open Document Open Filing 02 May 2018 000-55932
CORRESP Open Document Open Filing 30 Apr 2018
F-4/A Open Document Open Filing 25 Apr 2018 333-224242
UPLOAD Open Document Open Filing 24 Apr 2018
F-4 Open Document Open Filing 11 Apr 2018 333-224242
DRS/A Open Document Open Filing 22 Mar 2018 377-01811
UPLOAD Open Document Open Filing 06 Mar 2018
DRS/A Open Document Open Filing 06 Feb 2018 377-01811
UPLOAD Open Document Open Filing 25 Jan 2018
DRS/A Open Document Open Filing 10 Jan 2018 377-01811
UPLOAD Open Document Open Filing 29 Dec 2017
DRS Open Document Open Filing 01 Dec 2017 377-01811