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
ARS Annual report to shareholders Apr 27, 2026 Dec 31, 2025
10-K Annual report Mar 26, 2026 Dec 31, 2025
ARS Annual report to shareholders Apr 28, 2025 Dec 31, 2024
10-K Annual report Mar 27, 2025 Dec 31, 2024
ARS Annual report to shareholders Apr 16, 2024 Dec 31, 2023
10-K Annual report Mar 13, 2024 Dec 31, 2023
ARS Annual report to shareholders Sep 1, 2023 Dec 31, 2022
10-K Annual report Mar 30, 2023 Dec 31, 2022
10-K Annual report Mar 31, 2022 Dec 31, 2021
10-K/A Amended annual report Mar 23, 2021 Dec 31, 2020
10-K Annual report Mar 11, 2021 Dec 31, 2020
10-K Annual report Mar 16, 2020 Dec 31, 2019
10-K Annual report Mar 14, 2019 Dec 31, 2018
10-K Annual report Apr 2, 2018 Dec 31, 2017

Showing 14 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)

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Source: SEC EDGAR filings. This is company-reported data, not investment advice.