Spero Therapeutics is trading at $1.18, up 5.36%; biotech-sector strength is supportive.
- XBI was up 2.10% during regular trading.
- No clear company-specific announcement explaining the move surfaced. The CEO was scheduled to speak at the Chardan healthcare conference on October 20, a previously announced appearance; available results do not establish that it caused the rise.
- Trading volume information was unavailable.