QTREX Quantum is trading at $1.57, down 5.42% after hours; no clear company-specific catalyst was identified. - It closed the October 7 regular session at $1.66, above the current after-hours price. - Recent gains included 40.00% on October 5 and 40.20% on October 2. The latest company news found was October 1 testing of its cryogenic interconnect. - Broader markets closed lower amid rising Treasury yields and Fed policy concerns, but index moves were modest, making a direct link uncertain.