SPRO Stock Skyrockets on Breakthrough Oral Antibiotic Data
Spero shares closed at $2.29 on Oct. 20, 2025, up 3.6%, after reporting Phase 3 trial results showing oral tebipenem HBr matched IV imipenem in overall success (58.5% vs 60.2%) at IDWeek. The stock has surged over 120% year-to-date, trading between $0.51 and $3.22. GSK plans an FDA submission in Q4. Analyst 12-month targets average $5, but ratings remain mixed following a recent Zacks downgrade.
