Quantum BioPharma Ltd. is trading at $4.27 (+5.43%) after hours as the stock rebounds from a sharp decline triggered by a recent regulatory setback.
- The upward move follows heavy selling pressure last week after the FDA placed a clinical hold on the company's lead multiple sclerosis candidate.
- No new company-specific announcements were provided for the June 08, 2026, after-hours session, suggesting the bounce is a technical recovery rather than a response to a fresh catalyst.