Spero Therapeutics, Inc.
SEC Filing List

SPRO         CIK: 0001701108

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Form Description Owner/Filer Filing Agent Date Actions
10-QQuarterly report pursuant to Section 13 ...Spero Therapeutics, Inc. DONNELLEY FINANCIAL SOLUTIONS /FA/05/13/2026
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8-KCurrent report filingSpero Therapeutics, Inc. DONNELLEY FINANCIAL SOLUTIONS /FA/05/13/2026
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4Statement of changes in beneficial owner...Rajavelu EstherDONNELLEY FINANCIAL SOLUTIONS /FA/05/06/2026
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ARSAnnual report to security holdersSpero Therapeutics, Inc. DONNELLEY FINANCIAL SOLUTIONS /FA/04/27/2026
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DEFA14ADefinitive additional proxy soliciting m...Spero Therapeutics, Inc. DONNELLEY FINANCIAL SOLUTIONS /FA/04/27/2026
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DEF 14ADefinitive proxy statementsSpero Therapeutics, Inc. DONNELLEY FINANCIAL SOLUTIONS /FA/04/27/2026
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PRE 14APreliminary proxy statement not related ...Spero Therapeutics, Inc. DONNELLEY FINANCIAL SOLUTIONS /FA/04/13/2026
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PRE 14APreliminary proxy statement not related ...Spero Therapeutics, Inc. DONNELLEY FINANCIAL SOLUTIONS /FA/04/13/2026
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8-KCurrent report filingSpero Therapeutics, Inc. DONNELLEY FINANCIAL SOLUTIONS /FA/03/26/2026
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10-KAnnual report pursuant to Section 13 and...Spero Therapeutics, Inc. DONNELLEY FINANCIAL SOLUTIONS /FA/03/26/2026
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