Arqit Quantum is trading at $16.72, up 5.75% in pre-market, with no specific overnight announcement identified to explain the rise. - Arqit’s latest listed release was its October 20 strategic investment in Sirius, reported for quantum-safe defence communications. - The prior session’s news described Arqit down amid broad technology weakness, without linking the move to a company-specific event. - Available market context is mixed, and no volume or activity data was supplied.