Spero Therapeutics closed at $1.07 on Nov 4, up 2.88%, within 2.9% of its 52-week closing low. Volume of 210.3K shares was 0.56× its 20-day average (below normal).
Split-adjusted performance: -10.1% over one month, -57.7% over six months, -55.0% over one year.
Short interest was 840.5K shares at the Oct 15 settlement, up 5.8% from the prior report (2.0% of float, 1.5 days to cover).
Spero Therapeutics Inc is a clinical-stage biopharmaceutical firm. It focuses on identifying, developing, and commercializing novel treatments for MDR (Multi-drug-resistant) bacterial infections and rare diseases.
What is SPRO's market cap?
$62.31M, based on the Nov 4 close of $1.07.
What is SPRO's P/E ratio?
8.4× trailing-twelve-month earnings of $7.38M.
Does Spero Therapeutics pay a dividend?
No regular cash dividend has been paid in the last year.
How much of SPRO is sold short?
840.5K shares, 2.0% of float, as of Oct 15, 2026.
What sector is SPRO in?
Healthcare, in the Pharmaceuticals industry.
About Spero Therapeutics
Spero Therapeutics Inc is a clinical-stage biopharmaceutical firm. It focuses on identifying, developing, and commercializing novel treatments for MDR (Multi-drug-resistant) bacterial infections and rare diseases. The company's product candidate, tebipenem pivoxil hydrobromide or tebipenem HBr, is designed to be an oral carbapenem-class antibiotic for use in adults to treat MDR Gram-negative infections. It is also developing SPR720, a novel oral antibiotic designed for the treatment of a rare, orphan disease caused by pulmonary non-tuberculous mycobacterial infections, or NTM disease. It is also focused on SPR206, a next-generation polymyxin investigational product candidate being developed as an IV-administered medicine to treat MDR Gram-negative infections in the hospital.
Sources: Massive / Polygon daily aggregates (split-adjusted) · SEC filings via Massive · FINRA settlements via Massive · Financial Modeling Prep. Figures are dated where shown; research is informational, not investment advice. Methodology