Spero Therapeutics, Inc.

Symbol
SPRO on Nasdaq
Business address
675 Massachusetts Avenue, 14 Th Floor, Cambridge, MA, 02139
State of incorporation
DE
Fiscal year end
31 December
Former names
Spero Therapeutics, LLC (to 21 Mar 2017)
Get insider transactions for this issuer
Spero Therapeutics, Inc. has filed 481 SEC EDGAR filings since 21 Mar 2017

Latest Filings

Form type Document Filing Description Filing date Reporting date File number(s)
8-K Open Document | Data Open Filing 8-K 19 Dec 2025 19 Dec 2025 001-38266
8-K Open Document | Data Open Filing 8-K 13 Nov 2025 13 Nov 2025 001-38266
10-Q Open Document | Data Open Filing 10-Q 13 Nov 2025 30 Sep 2025 001-38266
4 Open Document Open Filing 4 12 Nov 2025 07 Nov 2025
4 Open Document Open Filing 4 03 Sep 2025 28 Aug 2025
4 Open Document Open Filing 4 03 Sep 2025 28 Aug 2025
SCHEDULE 13G/A Open Document Open Filing 14 Aug 2025 005-90168
S-8 Open Document | Data Open Filing S-8 12 Aug 2025 333-289544
10-Q Open Document | Data Open Filing 10-Q 12 Aug 2025 30 Jun 2025 001-38266
8-K Open Document | Data Open Filing 8-K 12 Aug 2025 12 Aug 2025 001-38266
8-K Open Document | Data Open Filing 8-K 18 Jun 2025 12 Jun 2025 001-38266
4 Open Document Open Filing 4 16 Jun 2025 12 Jun 2025
4 Open Document Open Filing 4 16 Jun 2025 12 Jun 2025
4 Open Document Open Filing 4 16 Jun 2025 12 Jun 2025
4 Open Document Open Filing 4 16 Jun 2025 12 Jun 2025
4 Open Document Open Filing 4 16 Jun 2025 12 Jun 2025
4 Open Document Open Filing 4 16 Jun 2025 12 Jun 2025
4 Open Document Open Filing 4 16 Jun 2025 12 Jun 2025
4 Open Document Open Filing 4 16 Jun 2025 12 Jun 2025
8-K Open Document | Data Open Filing 8-K 28 May 2025 28 May 2025 001-38266
8-K Open Document | Data Open Filing 8-K 13 May 2025 13 May 2025 001-38266
10-Q Open Document | Data Open Filing 10-Q 13 May 2025 31 Mar 2025 001-38266
4 Open Document Open Filing 4 06 May 2025 02 May 2025
ARS Open Document Open Filing ARS 28 Apr 2025 31 Dec 2024 001-38266
DEFA14A Open Document Open Filing DEFA14A 28 Apr 2025 001-38266
DEF 14A Open Document | Data Open Filing DEF 14A 28 Apr 2025 12 Jun 2025 001-38266
8-K Open Document | Data Open Filing 8-K 28 Apr 2025 22 Apr 2025 001-38266
SCHEDULE 13D/A Open Document Open Filing 28 Mar 2025 005-90168
8-K Open Document | Data Open Filing 8-K 27 Mar 2025 27 Mar 2025 001-38266
10-K Open Document | Data Open Filing 10-K 27 Mar 2025 31 Dec 2024 001-38266
8-K Open Document | Data Open Filing 8-K 28 Feb 2025 25 Feb 2025 001-38266
4 Open Document Open Filing 4 05 Feb 2025 03 Feb 2025
4 Open Document Open Filing 4 05 Feb 2025 03 Feb 2025
4 Open Document Open Filing 4 05 Feb 2025 03 Feb 2025
4 Open Document Open Filing 4 05 Feb 2025 05 Feb 2025
8-K Open Document | Data Open Filing 8-K 10 Jan 2025 07 Jan 2025 001-38266
SC 13G/A Open Document Open Filing SC 13G/A 14 Nov 2024 005-90168
8-K Open Document | Data Open Filing 8-K 14 Nov 2024 14 Nov 2024 001-38266
10-Q Open Document | Data Open Filing 10-Q 14 Nov 2024 30 Sep 2024 001-38266
4 Open Document Open Filing 4 12 Nov 2024 07 Nov 2024
8-K Open Document | Data Open Filing 8-K 29 Oct 2024 29 Oct 2024 001-38266
8-K Open Document | Data Open Filing 8-K 10 Sep 2024 09 Sep 2024 001-38266
4 Open Document Open Filing 4 29 Aug 2024 27 Aug 2024
4 Open Document Open Filing 4 29 Aug 2024 27 Aug 2024
4 Open Document Open Filing 4 29 Aug 2024 27 Aug 2024
4 Open Document Open Filing 4 06 Aug 2024 02 Aug 2024
S-8 Open Document Open Filing S-8 05 Aug 2024 333-281245
10-Q Open Document | Data Open Filing 10-Q 05 Aug 2024 30 Jun 2024 001-38266
8-K Open Document | Data Open Filing 8-K 05 Aug 2024 05 Aug 2024 001-38266
8-K Open Document | Data Open Filing 8-K 03 Jun 2024 29 May 2024 001-38266
4 Open Document Open Filing 4 30 May 2024 29 May 2024
4 Open Document Open Filing 4 30 May 2024 29 May 2024
4 Open Document Open Filing 4 30 May 2024 29 May 2024
4 Open Document Open Filing 4 30 May 2024 29 May 2024
4 Open Document Open Filing 4 30 May 2024 29 May 2024
4 Open Document Open Filing 4 30 May 2024 29 May 2024
4 Open Document Open Filing 4 30 May 2024 29 May 2024
4 Open Document Open Filing 4 30 May 2024 29 May 2024
8-K Open Document | Data Open Filing 8-K 15 May 2024 15 May 2024 001-38266
10-Q Open Document | Data Open Filing 10-Q 15 May 2024 31 Mar 2024 001-38266
ARS Open Document Open Filing ARS 16 Apr 2024 31 Dec 2023 001-38266
DEFA14A Open Document Open Filing DEFA14A 16 Apr 2024 001-38266
DEF 14A Open Document | Data Open Filing DEF 14A 16 Apr 2024 29 May 2024 001-38266
8-K Open Document | Data Open Filing 8-K 29 Mar 2024 29 Mar 2024 001-38266
EFFECT Open Document Open Filing 22 Mar 2024 333-277998
CORRESP Open Document Open Filing 20 Mar 2024
UPLOAD Open Document Open Filing 20 Mar 2024 333-277998
S-3 Open Document Open Filing S-3 15 Mar 2024 333-277998
S-8 Open Document Open Filing S-8 15 Mar 2024 333-277984
10-K Open Document | Data Open Filing 10-K 13 Mar 2024 31 Dec 2023 001-38266
8-K Open Document | Data Open Filing 8-K 13 Mar 2024 13 Mar 2024 001-38266
SC 13G Open Document Open Filing SC 13G 14 Feb 2024 005-90168
8-K Open Document | Data Open Filing 8-K 09 Feb 2024 05 Feb 2024 001-38266
4 Open Document Open Filing 4 05 Feb 2024 01 Feb 2024
4 Open Document Open Filing 4 05 Feb 2024 02 Feb 2024
4 Open Document Open Filing 4 05 Feb 2024 01 Feb 2024
4 Open Document Open Filing 4 05 Feb 2024 01 Feb 2024
4 Open Document Open Filing 4 05 Feb 2024 01 Feb 2024
4 Open Document Open Filing 4 05 Feb 2024 01 Feb 2024
144 Open Document Open Filing 05 Feb 2024 001-38266
8-K Open Document | Data Open Filing 8-K 08 Jan 2024 08 Jan 2024 001-38266
8-K Open Document | Data Open Filing 8-K 05 Jan 2024 05 Jan 2024 001-38266
4 Open Document Open Filing 4 04 Jan 2024 02 Jan 2024
8-K Open Document | Data Open Filing 8-K 02 Jan 2024 02 Jan 2024 001-38266
4 Open Document Open Filing 4 15 Nov 2023 13 Nov 2023
3 Open Document Open Filing 3 15 Nov 2023 06 Nov 2023
S-8 Open Document Open Filing S-8 13 Nov 2023 333-275515
S-8 Open Document Open Filing S-8 13 Nov 2023 333-275514
8-K Open Document | Data Open Filing 8-K 13 Nov 2023 13 Nov 2023 001-38266
10-Q Open Document | Data Open Filing 10-Q 13 Nov 2023 30 Sep 2023 001-38266
8-K Open Document | Data Open Filing 8-K 01 Nov 2023 30 Oct 2023 001-38266
8-K/A Open Document | Data Open Filing 8-K/A 16 Oct 2023 05 Oct 2023 001-38266
4 Open Document Open Filing 4 10 Oct 2023 05 Oct 2023
4 Open Document Open Filing 4 10 Oct 2023 05 Oct 2023
4 Open Document Open Filing 4 10 Oct 2023 05 Oct 2023
4 Open Document Open Filing 4 10 Oct 2023 05 Oct 2023
4 Open Document Open Filing 4 10 Oct 2023 05 Oct 2023
4 Open Document Open Filing 4 10 Oct 2023 05 Oct 2023
4 Open Document Open Filing 4 10 Oct 2023 05 Oct 2023
4 Open Document Open Filing 4 10 Oct 2023 05 Oct 2023
8-K Open Document | Data Open Filing 8-K 10 Oct 2023 05 Oct 2023 001-38266
4 Open Document Open Filing 4 15 Sep 2023 13 Sep 2023
ARS Open Document Open Filing ARS 01 Sep 2023 31 Dec 2022 001-38266
DEF 14A Open Document Open Filing DEF 14A 01 Sep 2023 05 Oct 2023 001-38266
4 Open Document Open Filing 4 30 Aug 2023 28 Aug 2023
4 Open Document Open Filing 4 30 Aug 2023 28 Aug 2023
4 Open Document Open Filing 4 30 Aug 2023 28 Aug 2023
4 Open Document Open Filing 4 30 Aug 2023 28 Aug 2023
144 Open Document Open Filing 29 Aug 2023 001-38266
PRE 14A Open Document Open Filing PRE 14A 22 Aug 2023 05 Oct 2023 001-38266
S-8 Open Document Open Filing S-8 10 Aug 2023 333-273880
8-K Open Document | Data Open Filing 8-K 10 Aug 2023 10 Aug 2023 001-38266
10-Q Open Document | Data Open Filing 10-Q 10 Aug 2023 30 Jun 2023 001-38266
4 Open Document Open Filing 4 03 Aug 2023 01 Aug 2023
8-K Open Document | Data Open Filing 8-K 31 Jul 2023 31 Jul 2023 001-38266
3 Open Document Open Filing 3 24 Jul 2023 15 Jul 2023
4 Open Document Open Filing 4 14 Jun 2023 12 Jun 2023
8-K Open Document | Data Open Filing 8-K 14 Jun 2023 12 Jun 2023 001-38266
8-K Open Document | Data Open Filing 8-K 11 May 2023 11 May 2023 001-38266
10-Q Open Document | Data Open Filing 10-Q 11 May 2023 31 Mar 2023 001-38266
S-8 Open Document Open Filing S-8 30 Mar 2023 333-271000
8-K Open Document | Data Open Filing 8-K 30 Mar 2023 30 Mar 2023 001-38266
10-K Open Document | Data Open Filing 10-K 30 Mar 2023 31 Dec 2022 001-38266
SC 13G/A Open Document Open Filing AMENDMENT NO. 5 TO THE SCHEDULE 13G 14 Feb 2023 005-90168
SC 13G/A Open Document Open Filing 14 Feb 2023 005-90168
4 Open Document Open Filing FORM 4 SUBMISSION 06 Feb 2023 03 Feb 2023
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2023 01 Feb 2023
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2023 01 Feb 2023
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2023 01 Feb 2023
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2023 01 Feb 2023
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2023 01 Feb 2023
8-K Open Document | Data Open Filing 8-K 01 Feb 2023 30 Jan 2023 001-38266
SC 13D/A Open Document Open Filing SCHEDULE 13D/A 20 Jan 2023 005-90168
CT ORDER Open Document Open Filing 19 Jan 2023 001-38266
8-K Open Document | Data Open Filing 8-K 09 Jan 2023 09 Jan 2023 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 05 Jan 2023 03 Jan 2023
4 Open Document Open Filing FORM 4 SUBMISSION 05 Jan 2023 03 Jan 2023
D Open Document Open Filing 15 Nov 2022 021-464777
3 Open Document Open Filing 14 Nov 2022 07 Nov 2022
SC 13D/A Open Document Open Filing SCHEDULE 13D/A 14 Nov 2022 005-90168
S-8 Open Document Open Filing S-8 14 Nov 2022 333-268344
8-K Open Document | Data Open Filing 8-K 14 Nov 2022 14 Nov 2022 001-38266
10-Q Open Document | Data Open Filing 10-Q 14 Nov 2022 30 Sep 2022 001-38266
8-K Open Document | Data Open Filing 8-K 08 Nov 2022 08 Nov 2022 001-38266
SC 13G/A Open Document Open Filing 03 Oct 2022 005-90168
4 Open Document Open Filing PRIMARY DOCUMENT 26 Sep 2022 22 Sep 2022
8-K Open Document | Data Open Filing 8-K 22 Sep 2022 21 Sep 2022 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 19 Sep 2022 15 Sep 2022
4 Open Document Open Filing FORM 4 SUBMISSION 19 Sep 2022 15 Sep 2022
4 Open Document Open Filing FORM 4 SUBMISSION 19 Sep 2022 15 Sep 2022
4 Open Document Open Filing FORM 4 SUBMISSION 19 Sep 2022 15 Sep 2022
4 Open Document Open Filing FORM 4 SUBMISSION 19 Sep 2022 15 Sep 2022
4 Open Document Open Filing FORM 4 SUBMISSION 19 Sep 2022 15 Sep 2022
4 Open Document Open Filing FORM 4 SUBMISSION 19 Sep 2022 15 Sep 2022
8-K Open Document | Data Open Filing 8-K 19 Sep 2022 15 Sep 2022 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 14 Sep 2022 12 Sep 2022
3 Open Document Open Filing FORM 3 SUBMISSION 14 Sep 2022 12 Sep 2022
8-K Open Document | Data Open Filing 8-K 06 Sep 2022 06 Sep 2022 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 30 Aug 2022 29 Aug 2022
8-K Open Document | Data Open Filing 8-K 10 Aug 2022 10 Aug 2022 001-38266
10-Q Open Document | Data Open Filing 10-Q 10 Aug 2022 30 Jun 2022 001-38266
DEFA14A Open Document Open Filing DEFA14A 05 Aug 2022 001-38266
DEF 14A Open Document Open Filing DEF 14A 05 Aug 2022 15 Sep 2022 001-38266
SC 13G Open Document Open Filing 08 Jul 2022 005-90168
8-K Open Document | Data Open Filing 8-K 01 Jul 2022 01 Jul 2022 001-38266
8-K Open Document | Data Open Filing 8-K 27 Jun 2022 27 Jun 2022 001-38266
8-K Open Document | Data Open Filing 8-K 07 Jun 2022 07 Jun 2022 001-38266
8-K Open Document | Data Open Filing 8-K 16 May 2022 16 May 2022 001-38266
10-Q Open Document | Data Open Filing 10-Q 16 May 2022 31 Mar 2022 001-38266
8-K Open Document | Data Open Filing 8-K 03 May 2022 03 May 2022 001-38266
4 Open Document Open Filing PRIMARY DOCUMENT 28 Apr 2022 26 Apr 2022
8-K Open Document | Data Open Filing 8-K 07 Apr 2022 06 Apr 2022 001-38266
8-K Open Document | Data Open Filing 8-K 31 Mar 2022 31 Mar 2022 001-38266
10-K Open Document | Data Open Filing 10-K 31 Mar 2022 31 Dec 2021 001-38266
4 Open Document Open Filing PRIMARY DOCUMENT 31 Mar 2022 30 Mar 2022
4 Open Document Open Filing PRIMARY DOCUMENT 16 Mar 2022 14 Mar 2022
SC 13G/A Open Document Open Filing 09 Mar 2022 005-90168
4 Open Document Open Filing PRIMARY DOCUMENT 02 Mar 2022 28 Feb 2022
4 Open Document Open Filing PRIMARY DOCUMENT 23 Feb 2022 18 Feb 2022
8-K Open Document | Data Open Filing 8-K 16 Feb 2022 16 Feb 2022 001-38266
SC 13G/A Open Document Open Filing 14 Feb 2022 005-90168
SC 13G/A Open Document Open Filing AMENDMENT NO. 4 TO THE SCHEDULE 13G 14 Feb 2022 005-90168
SC 13G/A Open Document Open Filing 03 Feb 2022 005-90168
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2022 01 Feb 2022
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2022 01 Feb 2022
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2022 01 Feb 2022
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2022 01 Feb 2022
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2022 01 Feb 2022
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2022 01 Feb 2022
4 Open Document Open Filing PRIMARY DOCUMENT 01 Feb 2022 31 Jan 2022
4 Open Document Open Filing PRIMARY DOCUMENT 26 Jan 2022 24 Jan 2022
SC 13G/A Open Document Open Filing SCHEDULE 13G/A 25 Jan 2022 005-90168
8-K Open Document | Data Open Filing 8-K 25 Jan 2022 25 Jan 2022 001-38266
4 Open Document Open Filing PRIMARY DOCUMENT 20 Jan 2022 18 Jan 2022
8-K Open Document | Data Open Filing 8-K 19 Jan 2022 19 Jan 2022 001-38266
4 Open Document Open Filing PRIMARY DOCUMENT 12 Jan 2022 10 Jan 2022
4 Open Document Open Filing FORM 4 SUBMISSION 07 Jan 2022 05 Jan 2022
4 Open Document Open Filing FORM 4 SUBMISSION 07 Jan 2022 05 Jan 2022
4 Open Document Open Filing FORM 4 SUBMISSION 07 Jan 2022 05 Jan 2022
8-K Open Document | Data Open Filing 8-K 04 Jan 2022 03 Jan 2022 001-38266
4 Open Document Open Filing PRIMARY DOCUMENT 03 Jan 2022 29 Dec 2021
4 Open Document Open Filing FORM 4 SUBMISSION 29 Dec 2021 27 Dec 2021
CT ORDER Open Document Open Filing 16 Dec 2021 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 12 Nov 2021 11 Nov 2021
8-K Open Document | Data Open Filing 8-K 10 Nov 2021 10 Nov 2021 001-38266
10-Q Open Document | Data Open Filing 10-Q 10 Nov 2021 30 Sep 2021 001-38266
4 Open Document Open Filing PRIMARY DOCUMENT 02 Nov 2021 29 Oct 2021
8-K Open Document | Data Open Filing 8-K 28 Oct 2021 27 Oct 2021 001-38266
3 Open Document Open Filing FORM 3 SUBMISSION 14 Oct 2021 11 Oct 2021
8-K Open Document | Data Open Filing 8-K 12 Oct 2021 11 Oct 2021 001-38266
4 Open Document Open Filing PRIMARY DOCUMENT 04 Oct 2021 30 Sep 2021
8-K Open Document | Data Open Filing 8-K 30 Sep 2021 29 Sep 2021 001-38266
S-8 Open Document Open Filing S-8 20 Sep 2021 333-259662
SC 13D/A Open Document Open Filing AMENDMENT TO FORM SC 13D 16 Sep 2021 005-90168
4 Open Document Open Filing PRIMARY DOCUMENT 15 Sep 2021 13 Sep 2021
4 Open Document Open Filing PRIMARY DOCUMENT 10 Sep 2021 09 Sep 2021
4 Open Document Open Filing PRIMARY DOCUMENT 01 Sep 2021 30 Aug 2021
4 Open Document Open Filing FORM 4 SUBMISSION 30 Aug 2021 26 Aug 2021
4 Open Document Open Filing FORM 4 SUBMISSION 30 Aug 2021 26 Aug 2021
4 Open Document Open Filing FORM 4 SUBMISSION 30 Aug 2021 26 Aug 2021
4 Open Document Open Filing FORM 4 SUBMISSION 30 Aug 2021 26 Aug 2021
4 Open Document Open Filing FORM 4 SUBMISSION 30 Aug 2021 26 Aug 2021
4 Open Document Open Filing FORM 4 SUBMISSION 30 Aug 2021 26 Aug 2021
8-K Open Document | Data Open Filing 8-K 30 Aug 2021 26 Aug 2021 001-38266
4 Open Document Open Filing PRIMARY DOCUMENT 27 Aug 2021 26 Aug 2021
4 Open Document Open Filing PRIMARY DOCUMENT 24 Aug 2021 20 Aug 2021
4 Open Document Open Filing FORM 4 SUBMISSION 18 Aug 2021 17 Aug 2021
4 Open Document Open Filing FORM 4 SUBMISSION 18 Aug 2021 17 Aug 2021
4 Open Document Open Filing FORM 4 SUBMISSION 18 Aug 2021 17 Aug 2021
4 Open Document Open Filing FORM 4 SUBMISSION 18 Aug 2021 17 Aug 2021
4 Open Document Open Filing FORM 4 SUBMISSION 18 Aug 2021 17 Aug 2021
4 Open Document Open Filing FORM 4 SUBMISSION 18 Aug 2021 17 Aug 2021
8-K Open Document | Data Open Filing 8-K 18 Aug 2021 17 Aug 2021 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 18 Aug 2021 17 Aug 2021
8-K Open Document | Data Open Filing 8-K 05 Aug 2021 05 Aug 2021 001-38266
10-Q Open Document | Data Open Filing 10-Q 05 Aug 2021 30 Jun 2021 001-38266
D Open Document Open Filing 14 Jul 2021 021-406258
SC 13G Open Document Open Filing SC 13G SPERO THERAPEUTICS, INC. 09 Jul 2021 005-90168
DEF 14A Open Document Open Filing DEF 14A 06 Jul 2021 17 Aug 2021 001-38266
8-K Open Document | Data Open Filing 8-K 01 Jul 2021 30 Jun 2021 001-38266
PRE 14A Open Document Open Filing PRE 14A 25 Jun 2021 17 Aug 2021 001-38266
8-K Open Document | Data Open Filing 8-K 06 May 2021 06 May 2021 001-38266
10-Q Open Document | Data Open Filing 10-Q Q1 2021 06 May 2021 31 Mar 2021 001-38266
EFFECT Open Document Open Filing 29 Mar 2021 333-254170
CORRESP Open Document Open Filing 24 Mar 2021
10-K/A Open Document Open Filing 10-K/A 23 Mar 2021 31 Dec 2020 001-38266
UPLOAD Open Document Open Filing 17 Mar 2021
S-8 Open Document Open Filing S-8 11 Mar 2021 333-254173
S-3 Open Document Open Filing S-3 11 Mar 2021 333-254170
8-K Open Document | Data Open Filing 8-K 11 Mar 2021 11 Mar 2021 001-38266
10-K Open Document | Data Open Filing 10-K 11 Mar 2021 31 Dec 2020 001-38266
SC 13D/A Open Document Open Filing AMENDED ACQUISITION OF BENEFICIAL OWNERSHIP 16 Feb 2021 005-90168
SC 13G/A Open Document Open Filing 16 Feb 2021 005-90168
SC 13G/A Open Document Open Filing AMENDMENT NO. 3 TO THE SCHEDULE 13G 16 Feb 2021 005-90168
SC 13G/A Open Document Open Filing SC 13G/A 10 Feb 2021 005-90168
4 Open Document Open Filing PRIMARY DOCUMENT 10 Feb 2021 08 Feb 2021
8-K Open Document | Data Open Filing 8-K 05 Feb 2021 05 Feb 2021 001-38266
4 Open Document Open Filing PRIMARY DOCUMENT 04 Feb 2021 01 Feb 2021
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2021 01 Feb 2021
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2021 01 Feb 2021
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2021 01 Feb 2021
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2021 01 Feb 2021
SC 13G Open Document Open Filing 02 Feb 2021 005-90168
SC 13G/A Open Document Open Filing SC 13G/A 02 Feb 2021 005-90168
8-K Open Document | Data Open Filing 8-K 19 Jan 2021 15 Jan 2021 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jan 2021 04 Jan 2021
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jan 2021 04 Jan 2021
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jan 2021 04 Jan 2021
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jan 2021 04 Jan 2021
4 Open Document Open Filing FORM 4 SUBMISSION 05 Jan 2021 04 Jan 2021
3 Open Document Open Filing FORM 3 SUBMISSION 05 Jan 2021 04 Jan 2021
4 Open Document Open Filing PRIMARY DOCUMENT 18 Dec 2020 16 Dec 2020
4 Open Document Open Filing FORM 4 SUBMISSION 18 Dec 2020 16 Dec 2020
8-K Open Document | Data Open Filing 8-K 17 Dec 2020 09 Dec 2020 001-38266
SC 13D/A Open Document Open Filing AMENDMENT NO. 5 TO SC 13D 07 Dec 2020 005-90168
8-K Open Document | Data Open Filing 8-K 03 Dec 2020 03 Dec 2020 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 02 Dec 2020 02 Dec 2020
3 Open Document Open Filing FORM 3 SUBMISSION 02 Dec 2020 02 Dec 2020
424B5 Open Document Open Filing 424B5 13 Nov 2020 333-228661
4 Open Document Open Filing PRIMARY DOCUMENT 10 Nov 2020 09 Nov 2020
4 Open Document Open Filing PRIMARY DOCUMENT 06 Nov 2020 04 Nov 2020
4 Open Document Open Filing FORM 4 SUBMISSION 05 Nov 2020 03 Nov 2020
8-K Open Document | Data Open Filing 8-K 05 Nov 2020 05 Nov 2020 001-38266
10-Q Open Document | Data Open Filing 10-Q 05 Nov 2020 30 Sep 2020 001-38266
8-K Open Document | Data Open Filing 8-K 28 Oct 2020 27 Oct 2020 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 27 Oct 2020 27 Oct 2020
4 Open Document Open Filing FORM 4 SUBMISSION 27 Oct 2020 27 Oct 2020
4 Open Document Open Filing FORM 4 SUBMISSION 27 Oct 2020 27 Oct 2020
4 Open Document Open Filing FORM 4 SUBMISSION 27 Oct 2020 27 Oct 2020
4 Open Document Open Filing FORM 4 SUBMISSION 27 Oct 2020 27 Oct 2020
4 Open Document Open Filing FORM 4 SUBMISSION 27 Oct 2020 23 Oct 2020
4 Open Document Open Filing FORM 4 SUBMISSION 27 Oct 2020 27 Oct 2020
4 Open Document Open Filing FORM 4 SUBMISSION 27 Oct 2020 27 Oct 2020
4 Open Document Open Filing FORM 4 SUBMISSION 15 Oct 2020 13 Oct 2020
DEF 14A Open Document Open Filing DEF 14A 30 Sep 2020 27 Oct 2020 001-38266
SC 13G/A Open Document Open Filing 23 Sep 2020 005-90168
3 Open Document Open Filing PRIMARY DOCUMENT 22 Sep 2020 11 Sep 2020
8-K Open Document | Data Open Filing 8-K 16 Sep 2020 16 Sep 2020 001-38266
8-K Open Document | Data Open Filing 8-K 14 Sep 2020 10 Sep 2020 001-38266
424B5 Open Document Open Filing 424B5 14 Sep 2020 333-228661
4 Open Document Open Filing FORM 4 SUBMISSION 10 Sep 2020 08 Sep 2020
424B5 Open Document Open Filing 424B5 09 Sep 2020 333-228661
8-K Open Document | Data Open Filing 8-K 09 Sep 2020 09 Sep 2020 001-38266
8-K Open Document | Data Open Filing 8-K 08 Sep 2020 08 Sep 2020 001-38266
S-8 Open Document Open Filing S-8 06 Aug 2020 333-241681
8-K Open Document | Data Open Filing 8-K 06 Aug 2020 06 Aug 2020 001-38266
10-Q Open Document | Data Open Filing 10-Q 06 Aug 2020 30 Jun 2020 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 09 Jul 2020 07 Jul 2020
4 Open Document Open Filing FORM 4 SUBMISSION 29 Jun 2020 22 Jun 2020
4 Open Document Open Filing FORM 4 SUBMISSION 23 Jun 2020 23 Jun 2020
SC 13D/A Open Document Open Filing AMENDMENT TO FORM SC 13D 04 Jun 2020 005-90168
8-K Open Document Open Filing 8-K 04 Jun 2020 04 Jun 2020 001-38266
8-K/A Open Document Open Filing 8-K/A 11 May 2020 16 Apr 2020 001-38266
8-K Open Document Open Filing 8-K 08 May 2020 08 May 2020 001-38266
10-Q Open Document | Data Open Filing 10-Q 08 May 2020 31 Mar 2020 001-38266
3 Open Document Open Filing FORM 3 SUBMISSION 23 Apr 2020 16 Apr 2020
8-K Open Document Open Filing 8-K 16 Apr 2020 16 Apr 2020 001-38266
S-8 Open Document Open Filing S-8 19 Mar 2020 333-237283
8-K Open Document Open Filing 8-K 16 Mar 2020 16 Mar 2020 001-38266
10-K Open Document | Data Open Filing 10-K 16 Mar 2020 31 Dec 2019 001-38266
8-K Open Document Open Filing 8-K 28 Feb 2020 28 Feb 2020 001-38266
SC 13G/A Open Document Open Filing AMENDMENT NO. 2 TO THE SCHEDULE 13G 18 Feb 2020 005-90168
SC 13D/A Open Document Open Filing AMENDMENT TO FORM SC 13D 14 Feb 2020 005-90168
SC 13G/A Open Document Open Filing 14 Feb 2020 005-90168
8-K Open Document Open Filing 8-K 11 Feb 2020 11 Feb 2020 001-38266
424B5 Open Document Open Filing 424B5 11 Feb 2020 333-228661
SC 13G/A Open Document Open Filing SCHEDULE 13G/A 04 Feb 2020 005-90168
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2020 03 Feb 2020
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2020 03 Feb 2020
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2020 03 Feb 2020
4 Open Document Open Filing FORM 4 SUBMISSION 03 Feb 2020 03 Feb 2020
SC 13G/A Open Document Open Filing SC 13G/A 31 Jan 2020 005-90168
8-K Open Document Open Filing 8-K 30 Jan 2020 30 Jan 2020 001-38266
3 Open Document Open Filing FORM 3 SUBMISSION 13 Jan 2020 01 Jan 2020
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jan 2020 02 Jan 2020
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jan 2020 02 Jan 2020
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jan 2020 02 Jan 2020
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jan 2020 02 Jan 2020
8-K Open Document Open Filing 8-K 19 Dec 2019 16 Dec 2019 001-38266
8-K Open Document Open Filing 8-K 05 Dec 2019 05 Dec 2019 001-38266
3 Open Document Open Filing FORM 3 SUBMISSION 08 Nov 2019 08 Nov 2019
8-K Open Document Open Filing 8-K 04 Nov 2019 04 Nov 2019 001-38266
10-Q Open Document | Data Open Filing 10-Q 04 Nov 2019 30 Sep 2019 001-38266
8-K Open Document Open Filing 8-K 03 Oct 2019 03 Oct 2019 001-38266
8-K Open Document Open Filing 8-K 06 Sep 2019 04 Sep 2019 001-38266
8-K Open Document Open Filing 8-K 08 Aug 2019 08 Aug 2019 001-38266
10-Q Open Document | Data Open Filing 10-Q 08 Aug 2019 30 Jun 2019 001-38266
424B5 Open Document Open Filing 424B5 14 Jun 2019 333-228661
8-K Open Document Open Filing 8-K 13 Jun 2019 12 Jun 2019 001-38266
8-K Open Document Open Filing 8-K 06 Jun 2019 05 Jun 2019 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 05 Jun 2019 05 Jun 2019
4 Open Document Open Filing FORM 4 SUBMISSION 05 Jun 2019 05 Jun 2019
4 Open Document Open Filing FORM 4 SUBMISSION 05 Jun 2019 05 Jun 2019
4 Open Document Open Filing FORM 4 SUBMISSION 05 Jun 2019 05 Jun 2019
4 Open Document Open Filing FORM 4 SUBMISSION 05 Jun 2019 05 Jun 2019
4 Open Document Open Filing FORM 4 SUBMISSION 05 Jun 2019 05 Jun 2019
8-K Open Document Open Filing 8-K 09 May 2019 09 May 2019 001-38266
10-Q Open Document | Data Open Filing 10-Q 09 May 2019 31 Mar 2019 001-38266
DEF 14A Open Document Open Filing DEF 14A 26 Apr 2019 05 Jun 2019 001-38266
8-K Open Document Open Filing 8-K 18 Apr 2019 18 Apr 2019 001-38266
CT ORDER Open Document Open Filing 01 Apr 2019 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 29 Mar 2019 29 Mar 2019
8-K/A Open Document Open Filing FORM 8-K/A 29 Mar 2019 19 Mar 2019 001-38266
3 Open Document Open Filing FORM 3 SUBMISSION 19 Mar 2019 19 Mar 2019
8-K Open Document Open Filing 8-K 19 Mar 2019 19 Mar 2019 001-38266
S-8 Open Document Open Filing S-8 14 Mar 2019 333-230283
S-8 Open Document Open Filing S-8 14 Mar 2019 333-230281
8-K Open Document Open Filing 8-K 14 Mar 2019 14 Mar 2019 001-38266
10-K Open Document | Data Open Filing 10-K 14 Mar 2019 31 Dec 2018 001-38266
SC 13G/A Open Document Open Filing SC 13G/A 14 Feb 2019 005-90168
SC 13G/A Open Document Open Filing AMENDMENT NO. 1 TO THE SCHEDULE 13G 14 Feb 2019 005-90168
SC 13G/A Open Document Open Filing SC 13G/A 14 Feb 2019 005-90168
SC 13G/A Open Document Open Filing 13 Feb 2019 005-90168
SC 13G/A Open Document Open Filing SC 13G/A 08 Feb 2019 005-90168
8-K Open Document Open Filing FORM 8-K 07 Jan 2019 04 Jan 2019 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 02 Jan 2019 02 Jan 2019
4 Open Document Open Filing FORM 4 SUBMISSION 02 Jan 2019 02 Jan 2019
4 Open Document Open Filing FORM 4 SUBMISSION 02 Jan 2019 02 Jan 2019
4 Open Document Open Filing FORM 4 SUBMISSION 02 Jan 2019 02 Jan 2019
4 Open Document Open Filing FORM 4 SUBMISSION 02 Jan 2019 02 Jan 2019
EFFECT Open Document Open Filing 11 Dec 2018 333-228661
CT ORDER Open Document Open Filing 11 Dec 2018 001-38266
CORRESP Open Document Open Filing 07 Dec 2018
S-3 Open Document Open Filing S-3 03 Dec 2018 333-228661
8-K Open Document Open Filing 8-K 16 Nov 2018 15 Nov 2018 001-38266
8-K Open Document Open Filing 8-K 13 Nov 2018 13 Nov 2018 001-38266
8-K Open Document Open Filing 8-K 08 Nov 2018 08 Nov 2018 001-38266
10-Q Open Document | Data Open Filing 10-Q 08 Nov 2018 30 Sep 2018 001-38266
8-K Open Document Open Filing 8-K 27 Sep 2018 27 Sep 2018 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 21 Sep 2018 21 Sep 2018
3 Open Document Open Filing FORM 3 SUBMISSION 21 Sep 2018 21 Sep 2018
SC 13D/A Open Document Open Filing 19 Sep 2018 005-90168
8-K Open Document Open Filing FORM 8-K 14 Aug 2018 14 Aug 2018 001-38266
8-K Open Document Open Filing 8-K 09 Aug 2018 09 Aug 2018 001-38266
10-Q Open Document | Data Open Filing 10-Q 09 Aug 2018 30 Jun 2018 001-38266
4 Open Document Open Filing OWNERSHIP DOCUMENT 17 Jul 2018 17 Jul 2018
SC 13D/A Open Document Open Filing 17 Jul 2018 005-90168
8-K Open Document Open Filing 8-K 17 Jul 2018 17 Jul 2018 001-38266
8-K Open Document Open Filing 8-K 16 Jul 2018 16 Jul 2018 001-38266
424B4 Open Document Open Filing 424B4 13 Jul 2018 333-226093
EFFECT Open Document Open Filing 12 Jul 2018 333-226093
S-1/A Open Document Open Filing S-1/A 11 Jul 2018 333-226093
8-K Open Document Open Filing 8-K 09 Jul 2018 09 Jul 2018 001-38266
S-1 Open Document | Data Open Filing S-1 09 Jul 2018 333-226093
8-K Open Document Open Filing 8-K 09 Jul 2018 09 Jul 2018 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jul 2018 05 Jul 2018
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jul 2018 05 Jul 2018
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jul 2018 05 Jul 2018
8-K Open Document Open Filing FORM 8-K 08 Jun 2018 05 Jun 2018 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jun 2018 05 Jun 2018
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jun 2018 05 Jun 2018
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jun 2018 05 Jun 2018
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jun 2018 05 Jun 2018
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jun 2018 05 Jun 2018
4 Open Document Open Filing FORM 4 SUBMISSION 06 Jun 2018 05 Jun 2018
DRS Open Document Open Filing 25 May 2018 377-02085
8-K Open Document Open Filing 8-K 10 May 2018 10 May 2018 001-38266
10-Q Open Document | Data Open Filing SPERO THERAPEUTICS, INC. Q1 2018 10-Q 10 May 2018 31 Mar 2018 001-38266
DEF 14A Open Document Open Filing DEF14A 27 Apr 2018 05 Jun 2018 001-38266
8-K Open Document Open Filing 8-K 02 Apr 2018 02 Apr 2018 001-38266
10-K Open Document | Data Open Filing 10-K 02 Apr 2018 31 Dec 2017 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 30 Mar 2018 30 Mar 2018
SC 13D Open Document Open Filing SC 13D 14 Mar 2018 005-90168
SC 13G Open Document Open Filing SC 13G 14 Feb 2018 005-90168
SC 13G Open Document Open Filing SC 13G 14 Feb 2018 005-90168
SC 13G Open Document Open Filing SC 13G 14 Feb 2018 005-90168
SC 13G Open Document Open Filing SC 13G 13 Feb 2018 005-90168
SC 13G Open Document Open Filing 13 Feb 2018 005-90168
3 Open Document Open Filing FORM 3 SUBMISSION 06 Feb 2018 01 Feb 2018
8-K Open Document Open Filing 8-K 01 Feb 2018 01 Feb 2018 001-38266
8-K Open Document Open Filing 8-K 23 Jan 2018 17 Jan 2018 001-38266
4 Open Document Open Filing FORM 4 SUBMISSION 05 Jan 2018 04 Jan 2018
3 Open Document Open Filing FORM 3 SUBMISSION 05 Jan 2018 04 Jan 2018
4 Open Document Open Filing FORM 4 SUBMISSION 15 Dec 2017 13 Dec 2017
4 Open Document Open Filing FORM 4 SUBMISSION 15 Dec 2017 13 Dec 2017
4 Open Document Open Filing FORM 4 SUBMISSION 15 Dec 2017 13 Dec 2017
4 Open Document Open Filing FORM 4 SUBMISSION 15 Dec 2017 13 Dec 2017
S-8 Open Document Open Filing FORM S-8 14 Dec 2017 333-222060
8-K Open Document Open Filing 8-K 14 Dec 2017 14 Dec 2017 001-38266
10-Q Open Document | Data Open Filing FORM 10-Q 14 Dec 2017 30 Sep 2017 001-38266
SC 13D Open Document Open Filing 16 Nov 2017 005-90168
SC 13G Open Document Open Filing 15 Nov 2017 005-90168
SC 13G Open Document Open Filing THE SCHEDULE 13G 09 Nov 2017 005-90168
4 Open Document Open Filing OWNERSHIP DOCUMENT 07 Nov 2017 06 Nov 2017
4 Open Document Open Filing FORM 4 SUBMISSION 07 Nov 2017 06 Nov 2017
4 Open Document Open Filing FORM 4 SUBMISSION 07 Nov 2017 06 Nov 2017
4 Open Document Open Filing FORM 4 SUBMISSION 07 Nov 2017 06 Nov 2017
4 Open Document Open Filing FORM 4 SUBMISSION 07 Nov 2017 06 Nov 2017
4 Open Document Open Filing FORM 4 SUBMISSION 07 Nov 2017 06 Nov 2017
8-K Open Document Open Filing FORM 8-K 06 Nov 2017 06 Nov 2017 001-38266
UPLOAD Open Document Open Filing 06 Nov 2017
424B4 Open Document Open Filing 424B4 02 Nov 2017 333-220858
3 Open Document Open Filing OWNERSHIP DOCUMENT 02 Nov 2017 01 Nov 2017
EFFECT Open Document Open Filing 01 Nov 2017 333-220858
3 Open Document Open Filing FORM 3 SUBMISSION 01 Nov 2017 01 Nov 2017
3 Open Document Open Filing FORM 3 SUBMISSION 01 Nov 2017 01 Nov 2017
3 Open Document Open Filing FORM 3 SUBMISSION 01 Nov 2017 01 Nov 2017
3 Open Document Open Filing FORM 3 SUBMISSION 01 Nov 2017 01 Nov 2017
3 Open Document Open Filing FORM 3 SUBMISSION 01 Nov 2017 01 Nov 2017
3 Open Document Open Filing FORM 3 SUBMISSION 01 Nov 2017 01 Nov 2017
3 Open Document Open Filing FORM 3 SUBMISSION 01 Nov 2017 01 Nov 2017
3 Open Document Open Filing FORM 3 SUBMISSION 01 Nov 2017 01 Nov 2017
3 Open Document Open Filing FORM 3 SUBMISSION 01 Nov 2017 01 Nov 2017
3 Open Document Open Filing FORM 3 SUBMISSION 01 Nov 2017 01 Nov 2017
3 Open Document Open Filing FORM 3 SUBMISSION 01 Nov 2017 01 Nov 2017
3 Open Document Open Filing FORM 3 SUBMISSION 01 Nov 2017 01 Nov 2017
3 Open Document Open Filing FORM 3 SUBMISSION 01 Nov 2017 01 Nov 2017
3 Open Document Open Filing FORM 3 SUBMISSION 01 Nov 2017 01 Nov 2017
CERTNAS Open Document Open Filing AUTO-GENERATED PAPER DOCUMENT 01 Nov 2017 001-38266
CT ORDER Open Document Open Filing 01 Nov 2017 333-220858
CORRESP Open Document Open Filing 30 Oct 2017
CORRESP Open Document Open Filing 30 Oct 2017
8-A12B Open Document Open Filing 8-A12B 30 Oct 2017 001-38266
S-1/A Open Document Open Filing S-1/A 23 Oct 2017 333-220858
CORRESP Open Document Open Filing 12 Oct 2017
S-1 Open Document Open Filing S-1 06 Oct 2017 333-220858
DRSLTR Open Document Open Filing 29 Sep 2017
DRS/A Open Document Open Filing 29 Sep 2017 377-01690
DRS/A Open Document Open Filing 22 Sep 2017 377-01690
DRS Open Document Open Filing 25 Aug 2017 377-01690
D Open Document Open Filing 21 Mar 2017 021-283010