Arqit Quantum is trading at $12.13, down 12.04%, amid broader market pressure on technology stocks; no confirmed company-specific catalyst was identified. - Major indexes fell sharply on November 5, with technology stocks pressured by AI-regulation concerns and Qualcomm’s weak outlook. - Arqit’s investor-relations page lists its latest announcements as October 20 and October 8. Trading-volume information was unavailable.