Spero Therapeutics, Inc. SEC filings SPRO
Spero Therapeutics, Inc. has 515 filings in SEC EDGAR's recent list, going back to Mar 21, 2017. Its latest annual report, Form ARS, was filed on Apr 27, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 12, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Oct 27, 2026 (officer or director change). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 8-K |
Current report
Officer or director change
|
Oct 27, 2026 | Oct 26, 2026 |
| 8-K |
Current report
Material agreement, Other events
|
Aug 28, 2026 | Aug 28, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 12, 2026 | Aug 12, 2026 |
| 8-K |
Current report
Material agreement, New debt, Regulation FD disclosure, Other events
|
Jul 14, 2026 | Jul 8, 2026 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change, Shareholder vote results
|
Jun 25, 2026 | Jun 23, 2026 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jun 22, 2026 | Jun 17, 2026 |
| 8-K |
Current report
Results of operations
|
May 13, 2026 | May 13, 2026 |
| 8-K |
Current report
Results of operations
|
Mar 26, 2026 | Mar 26, 2026 |
| 8-K |
Current report
Officer or director change, Other events
|
Jan 30, 2026 | Jan 30, 2026 |
| 8-K |
Current report
Other events
|
Dec 19, 2025 | Dec 19, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 13, 2025 | Nov 13, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 12, 2025 | Aug 12, 2025 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jun 18, 2025 | Jun 12, 2025 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
May 28, 2025 | May 28, 2025 |
| 8-K |
Current report
Results of operations
|
May 13, 2025 | May 13, 2025 |
| 8-K |
Current report
Officer or director change
|
Apr 28, 2025 | Apr 22, 2025 |
| 8-K |
Current report
Results of operations
|
Mar 27, 2025 | Mar 27, 2025 |
| 8-K |
Current report
Listing notice
|
Feb 28, 2025 | Feb 25, 2025 |
| 8-K |
Current report
Results of operations, Officer or director change, Regulation FD disclosure, Other events
|
Jan 10, 2025 | Jan 7, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 14, 2024 | Nov 14, 2024 |
| 8-K |
Current report
Results of operations, Exit or restructuring costs, Regulation FD disclosure, Other events
|
Oct 29, 2024 | Oct 29, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 10, 2024 | Sep 9, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 5, 2024 | Aug 5, 2024 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jun 3, 2024 | May 29, 2024 |
| 8-K |
Current report
Results of operations
|
May 15, 2024 | May 15, 2024 |
| 8-K |
Current report
Other events
|
Mar 29, 2024 | Mar 29, 2024 |
| 8-K |
Current report
Results of operations
|
Mar 13, 2024 | Mar 13, 2024 |
| 8-K |
Current report
Officer or director change
|
Feb 9, 2024 | Feb 5, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 8, 2024 | Jan 8, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jan 5, 2024 | Jan 5, 2024 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jan 2, 2024 | Jan 2, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 13, 2023 | Nov 13, 2023 |
| 8-K |
Current report
Officer or director change, Other events
|
Nov 1, 2023 | Oct 30, 2023 |
| 8-K/A |
Amended current report
Bylaw or fiscal year change, Shareholder vote results
|
Oct 16, 2023 | Oct 5, 2023 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change, Shareholder vote results
|
Oct 10, 2023 | Oct 5, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 10, 2023 | Aug 10, 2023 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jul 31, 2023 | Jul 31, 2023 |
| 8-K |
Current report
Officer or director change, Other events
|
Jun 14, 2023 | Jun 12, 2023 |
| 8-K |
Current report
Results of operations
|
May 11, 2023 | May 11, 2023 |
| 8-K |
Current report
Results of operations
|
Mar 30, 2023 | Mar 30, 2023 |
| 8-K |
Current report
Officer or director change
|
Feb 1, 2023 | Jan 30, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jan 9, 2023 | Jan 9, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 14, 2022 | Nov 14, 2022 |
| 8-K |
Current report
Other events
|
Nov 8, 2022 | Nov 8, 2022 |
| 8-K |
Current report
Material agreement, Unregistered share sale, Other events
|
Sep 22, 2022 | Sep 21, 2022 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Sep 19, 2022 | Sep 15, 2022 |
| 8-K |
Current report
Other events
|
Sep 6, 2022 | Sep 6, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 10, 2022 | Aug 10, 2022 |
| 8-K |
Current report
Officer or director change
|
Jul 1, 2022 | Jul 1, 2022 |
| 8-K |
Current report
Other events
|
Jun 27, 2022 | Jun 27, 2022 |
| 8-K |
Current report
Agreement ended
|
Jun 7, 2022 | Jun 7, 2022 |
| 8-K |
Current report
Results of operations
|
May 16, 2022 | May 16, 2022 |
| 8-K |
Current report
Exit or restructuring costs, Officer or director change, Other events
|
May 3, 2022 | May 3, 2022 |
| 8-K |
Current report
Other events
|
Apr 7, 2022 | Apr 6, 2022 |
| 8-K |
Current report
Results of operations
|
Mar 31, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Other events
|
Feb 16, 2022 | Feb 16, 2022 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jan 25, 2022 | Jan 25, 2022 |
| 8-K |
Current report
Other events
|
Jan 19, 2022 | Jan 19, 2022 |
| 8-K |
Current report
Other events
|
Jan 4, 2022 | Jan 3, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 10, 2021 | Nov 10, 2021 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Oct 28, 2021 | Oct 27, 2021 |
| 8-K |
Current report
Officer or director change
|
Oct 12, 2021 | Oct 11, 2021 |
| 8-K |
Current report
Material agreement, New debt
|
Sep 30, 2021 | Sep 29, 2021 |
| 8-K |
Current report
Officer or director change
|
Aug 30, 2021 | Aug 26, 2021 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change, Shareholder vote results
|
Aug 18, 2021 | Aug 17, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 5, 2021 | Aug 5, 2021 |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Jul 1, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations
|
May 6, 2021 | May 6, 2021 |
| 8-K |
Current report
Results of operations
|
Mar 11, 2021 | Mar 11, 2021 |
| 8-K |
Current report
Other events
|
Feb 5, 2021 | Feb 5, 2021 |
| 8-K |
Current report
Material agreement
|
Jan 19, 2021 | Jan 15, 2021 |
| 8-K |
Current report
Officer or director change, Other events
|
Dec 17, 2020 | Dec 9, 2020 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Dec 3, 2020 | Dec 3, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2020 | Nov 5, 2020 |
| 8-K |
Current report
Shareholder vote results
|
Oct 28, 2020 | Oct 27, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 16, 2020 | Sep 16, 2020 |
| 8-K |
Current report
Material agreement, Bylaw or fiscal year change, Other events
|
Sep 14, 2020 | Sep 10, 2020 |
| 8-K |
Current report
Other events
|
Sep 9, 2020 | Sep 9, 2020 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Sep 8, 2020 | Sep 8, 2020 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2020 | Aug 6, 2020 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jun 4, 2020 | Jun 4, 2020 |
| 8-K/A |
Amended current report
Officer or director change
|
May 11, 2020 | Apr 16, 2020 |
| 8-K |
Current report
Results of operations
|
May 8, 2020 | May 8, 2020 |
| 8-K |
Current report
Officer or director change
|
Apr 16, 2020 | Apr 16, 2020 |
| 8-K |
Current report
Results of operations
|
Mar 16, 2020 | Mar 16, 2020 |
| 8-K |
Current report
Change to shareholder rights, Bylaw or fiscal year change, Other events
|
Feb 28, 2020 | Feb 28, 2020 |
| 8-K |
Current report
Results of operations, Other events
|
Feb 11, 2020 | Feb 11, 2020 |
| 8-K |
Current report
Material agreement, Unregistered share sale, Other events
|
Jan 30, 2020 | Jan 30, 2020 |
| 8-K |
Current report
Material agreement, New debt
|
Dec 19, 2019 | Dec 16, 2019 |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 5, 2019 | Dec 5, 2019 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2019 | Nov 4, 2019 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 3, 2019 | Oct 3, 2019 |
| 8-K |
Current report
Officer or director change
|
Sep 6, 2019 | Sep 4, 2019 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2019 | Aug 8, 2019 |
| 8-K |
Current report
Material agreement
|
Jun 13, 2019 | Jun 12, 2019 |
| 8-K |
Current report
Shareholder vote results
|
Jun 6, 2019 | Jun 5, 2019 |
| 8-K |
Current report
Results of operations
|
May 9, 2019 | May 9, 2019 |
| 8-K |
Current report
Officer or director change
|
Apr 18, 2019 | Apr 18, 2019 |
| 8-K/A |
Amended current report
Officer or director change
|
Mar 29, 2019 | Mar 19, 2019 |
| 8-K |
Current report
Officer or director change
|
Mar 19, 2019 | Mar 19, 2019 |
| 8-K |
Current report
Results of operations
|
Mar 14, 2019 | Mar 14, 2019 |
| 8-K |
Current report
Material agreement, Other events
|
Jan 7, 2019 | Jan 4, 2019 |
| 8-K |
Current report
Material agreement, Unregistered share sale, Change to shareholder rights, Bylaw or fiscal year change
|
Nov 16, 2018 | Nov 15, 2018 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Nov 13, 2018 | Nov 13, 2018 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2018 | Nov 8, 2018 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 27, 2018 | Sep 27, 2018 |
| 8-K |
Current report
Officer or director change
|
Aug 14, 2018 | Aug 14, 2018 |
| 8-K |
Current report
Results of operations
|
Aug 9, 2018 | Aug 9, 2018 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Jul 17, 2018 | Jul 17, 2018 |
| 8-K |
Current report
Other events
|
Jul 16, 2018 | Jul 16, 2018 |
| 8-K |
Current report
Results of operations, Other events
|
Jul 9, 2018 | Jul 9, 2018 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 9, 2018 | Jul 9, 2018 |
| 8-K |
Current report
Shareholder vote results
|
Jun 8, 2018 | Jun 5, 2018 |
| 8-K |
Current report
Results of operations
|
May 10, 2018 | May 10, 2018 |
| 8-K |
Current report
Results of operations
|
Apr 2, 2018 | Apr 2, 2018 |
| 8-K |
Current report
Officer or director change
|
Feb 1, 2018 | Feb 1, 2018 |
| 8-K |
Current report
Material agreement, New debt
|
Jan 23, 2018 | Jan 17, 2018 |
| 8-K |
Current report
Results of operations
|
Dec 14, 2017 | Dec 14, 2017 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change, Other events
|
Nov 6, 2017 | Nov 6, 2017 |
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Company profile
- Industry
- Pharmaceutical Preparations (SIC 2834)
- Listed as
- SPRO (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Cambridge, MA
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 1701108
- Former names
- Spero Therapeutics, LLC (until Mar 21, 2017)
Other Pharmaceutical Preparations companies
- ELI LILLY & Co LLY
- Johnson & Johnson JNJ
- AbbVie Inc. ABBV
- Merck & Co., Inc. MRK
- Novartis AG NVS
- Astrazeneca PLC AZN
- Abbott Laboratories ABT
- Novo Nordisk A S NVO
Source: SEC EDGAR filings. This is company-reported data, not investment advice.