Quantum BioPharma is trading 6.58% higher at $2.59 after hours, with biotech-sector strength a possible contributor but no confirmed direct cause. - The price compares with the regular-session close of $2.43; the XBI was up 2.10% during the regular session. - No confirmed new company announcement explaining the move appeared in search results. FDA clearance for Lucid-MS and the Thermo Fisher trial agreement were previously reported, not confirmed as fresh catalysts.