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Spero Therapeutics SEC Filings

NASDAQ: SPROHealth CareBiotechnology: Pharmaceutical PreparationsUSD

1.20+0.06 (+5.26%)

At close: Oct 9, 4:00 PM ET · Delayed 15 min

Spero Therapeutics filing overview

This page lists 60 recent SEC filings by Spero Therapeutics (SPRO), including 29 4, 19 8-K, 5 10-Q, 2 DEF 14A. The latest annual report (10-K) was filed on Mar 26, 2026 for the period ending Dec 31, 2025. The most recent quarterly report (10-Q) was filed on Aug 12, 2026.

The latest current report (8-K), used to disclose material events such as earnings releases and executive changes, was filed on Aug 28, 2026. Form 10-K is the audited annual report, 10-Q the quarterly report, 8-K covers material events, and Form 4 reports insider transactions. All documents link directly to SEC EDGAR.

Summary generated from market data by MetaCap's automated system. Methodology

SPRO SEC filings

Spero Therapeutics SEC filings
FiledFormDescriptionDocument
Aug 28, 20268-KEntry into a Material Definitive Agreement; Other EventsView on EDGAR
Aug 12, 202610-QQuarterly reportView on EDGAR
Aug 12, 20268-KResults of Operations and Financial ConditionView on EDGAR
Aug 6, 20264Statement of changes in beneficial ownershipView on EDGAR
Jul 14, 20268-KEntry into a Material Definitive Agreement; Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement; Regulation FD Disclosure; Other EventsView on EDGAR
Jun 25, 20268-KDeparture or Appointment of Directors or Officers; Compensatory Arrangements; Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year; Submission of Matters to a Vote of Security HoldersView on EDGAR
Jun 25, 20264Statement of changes in beneficial ownershipView on EDGAR
Jun 25, 20264Statement of changes in beneficial ownershipView on EDGAR
Jun 25, 20264Statement of changes in beneficial ownershipView on EDGAR
Jun 25, 20264Statement of changes in beneficial ownershipView on EDGAR
Jun 25, 20264Statement of changes in beneficial ownershipView on EDGAR
Jun 25, 20264Statement of changes in beneficial ownershipView on EDGAR
Jun 25, 20264Statement of changes in beneficial ownershipView on EDGAR
Jun 22, 20268-KRegulation FD Disclosure; Other EventsView on EDGAR
May 13, 20268-KResults of Operations and Financial ConditionView on EDGAR
May 13, 202610-QQuarterly reportView on EDGAR
May 6, 20264Statement of changes in beneficial ownershipView on EDGAR
Apr 27, 2026DEF 14ADefinitive proxy statementView on EDGAR
Mar 26, 202610-KAnnual reportView on EDGAR
Mar 26, 20268-KResults of Operations and Financial ConditionView on EDGAR
Feb 9, 20264Statement of changes in beneficial ownershipView on EDGAR
Feb 9, 20264Statement of changes in beneficial ownershipView on EDGAR
Feb 5, 20264Statement of changes in beneficial ownershipView on EDGAR
Feb 4, 20264Statement of changes in beneficial ownershipView on EDGAR
Jan 30, 20268-KDeparture or Appointment of Directors or Officers; Compensatory Arrangements; Other EventsView on EDGAR
Dec 19, 20258-KOther EventsView on EDGAR
Nov 13, 202510-QQuarterly reportView on EDGAR
Nov 13, 20258-KResults of Operations and Financial Condition; Regulation FD DisclosureView on EDGAR
Nov 12, 20254Statement of changes in beneficial ownershipView on EDGAR
Sep 3, 20254Statement of changes in beneficial ownershipView on EDGAR
Sep 3, 20254Statement of changes in beneficial ownershipView on EDGAR
Aug 14, 2025SCHEDULE 13G/ABeneficial ownership report (passive) (amendment)View on EDGAR
Aug 12, 202510-QQuarterly reportView on EDGAR
Aug 12, 20258-KResults of Operations and Financial Condition; Regulation FD DisclosureView on EDGAR
Jun 18, 20258-KDeparture or Appointment of Directors or Officers; Compensatory Arrangements; Submission of Matters to a Vote of Security HoldersView on EDGAR
Jun 16, 20254Statement of changes in beneficial ownershipView on EDGAR
Jun 16, 20254Statement of changes in beneficial ownershipView on EDGAR
Jun 16, 20254Statement of changes in beneficial ownershipView on EDGAR
Jun 16, 20254Statement of changes in beneficial ownershipView on EDGAR
Jun 16, 20254Statement of changes in beneficial ownershipView on EDGAR
Jun 16, 20254Statement of changes in beneficial ownershipView on EDGAR
Jun 16, 20254Statement of changes in beneficial ownershipView on EDGAR
Jun 16, 20254Statement of changes in beneficial ownershipView on EDGAR
May 28, 20258-KRegulation FD Disclosure; Other EventsView on EDGAR
May 13, 202510-QQuarterly reportView on EDGAR
May 13, 20258-KResults of Operations and Financial ConditionView on EDGAR
May 6, 20254Statement of changes in beneficial ownershipView on EDGAR
Apr 28, 20258-KDeparture or Appointment of Directors or Officers; Compensatory ArrangementsView on EDGAR
Apr 28, 2025DEF 14ADefinitive proxy statementView on EDGAR
Mar 28, 2025SCHEDULE 13D/ABeneficial ownership report (activist) (amendment)View on EDGAR
Mar 27, 202510-KAnnual reportView on EDGAR
Mar 27, 20258-KResults of Operations and Financial ConditionView on EDGAR
Feb 28, 20258-KNotice of Delisting or Failure to Satisfy a Continued Listing Rule; Transfer of ListingView on EDGAR
Feb 5, 20254Statement of changes in beneficial ownershipView on EDGAR
Feb 5, 20254Statement of changes in beneficial ownershipView on EDGAR
Feb 5, 20254Statement of changes in beneficial ownershipView on EDGAR
Feb 5, 20254Statement of changes in beneficial ownershipView on EDGAR
Jan 10, 20258-KResults of Operations and Financial Condition; Departure or Appointment of Directors or Officers; Compensatory Arrangements; Regulation FD Disclosure; Other EventsView on EDGAR
Nov 14, 20248-KResults of Operations and Financial ConditionView on EDGAR
Nov 14, 2024SC 13G/ABeneficial ownership report (passive) (amendment)View on EDGAR

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