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 |
|---|---|---|---|
| EFFECT | Filing | Sep 10, 2026 | — |
| EFFECT | Filing | Mar 22, 2024 | — |
| CORRESP | Letter to the SEC | Mar 20, 2024 | — |
| UPLOAD | Letter from the SEC | Mar 20, 2024 | — |
| CT ORDER | Filing | Jan 19, 2023 | — |
| D | Filing | Nov 15, 2022 | — |
| CT ORDER | Filing | Dec 16, 2021 | — |
| D | Filing | Jul 14, 2021 | — |
| EFFECT | Filing | Mar 29, 2021 | — |
| CORRESP | Letter to the SEC | Mar 24, 2021 | — |
| UPLOAD | Letter from the SEC | Mar 17, 2021 | — |
| CT ORDER | Filing | Apr 1, 2019 | — |
| EFFECT | Filing | Dec 11, 2018 | — |
| CT ORDER | Filing | Dec 11, 2018 | — |
| CORRESP | Letter to the SEC | Dec 7, 2018 | — |
| EFFECT | Filing | Jul 12, 2018 | — |
| DRS | Filing | May 25, 2018 | — |
| UPLOAD | Letter from the SEC | Nov 6, 2017 | — |
| EFFECT | Filing | Nov 1, 2017 | — |
| CERTNAS | Auto-generated paper document | Nov 1, 2017 | — |
| CT ORDER | Filing | Nov 1, 2017 | — |
| CORRESP | Letter to the SEC | Oct 30, 2017 | — |
| CORRESP | Letter to the SEC | Oct 30, 2017 | — |
| 8-A12B | Filing | Oct 30, 2017 | — |
| CORRESP | Letter to the SEC | Oct 12, 2017 | — |
| DRSLTR | Filing | Sep 29, 2017 | — |
| DRS/A | Filing | Sep 29, 2017 | — |
| DRS/A | Filing | Sep 22, 2017 | — |
| DRS | Filing | Aug 25, 2017 | — |
| D | Filing | Mar 21, 2017 | — |
Showing 30 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
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.