{"url_path":"/sec/spro/8-k/2026-06-25/item-5-03","section_key":"item-5-03","section_title":"Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.","topic":"sec","document":{"doc_type":"8-K","doc_date":"2026-06-25","source_url":"https://www.sec.gov/Archives/edgar/data/1701108/0001193125-26-283033-index.html","accession_number":"0001193125-26-283033","cik":"0001701108","ticker":"SPRO","issuer_name":"Spero Therapeutics, Inc.","edgar_url":"https://www.sec.gov/Archives/edgar/data/1701108/0001193125-26-283033-index.html","primary_entity_key":"0001701108","primary_entity_name":"Spero Therapeutics, Inc."},"word_count":122,"has_tables":true,"body_markdown":"Item 5.03\n\nAmendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.\n\nAmendment to Articles of Incorporation\n\nAt the Annual Meeting, the stockholders of the Company approved an amendment to the Company’s Amended and Restated Certificate of Incorporation, to increase the total number of shares of common stock authorized for issuance thereunder from 120,000,000 shares to 240,000,000 shares. The certificate of amendment to the Company’s Amended and Restated Certificate of Incorporation (the “Certificate of Amendment”) was filed with the Secretary of State of the State of Delaware on June 23, 2026 and became effective upon filing.\n\nThe foregoing description is qualified in its entirety by the Certificate of Amendment, which is attached as Exhibit 3.1 and is incorporated herein by reference."}