QTREX Quantum is trading 11.04% higher at $1.71 after-hours; the direct cause is unconfirmed. - October 5 regular-session close: $1.54, up 40.00%; October 2 gain: 40.20%. - No new October 5 company announcement was identified. On October 1, an industry company independently tested QTREX’s cryogenic interconnect at 20 millikelvin, reporting over 100 dB channel isolation. QTREX said it was finalizing a binding agreement with the tester; the announcement is a likely catalyst, though the direct cause of the after-hours move remains unconfirmed.