Quantum BioPharma Ltd. is trading 5.2% down at $3.84 as selling resumes following an FDA clinical hold on its lead multiple sclerosis candidate.
- The stock has fallen steadily from $6.86 on May 29, 2026, experiencing multiple consecutive daily declines.
- Sentiment remains fragile amid ongoing regulatory uncertainty despite a brief rebound on June 8, 2026, following the initial selloff.