Senti Biosciences is trading at $0.31, up 18.85%, with no new company-specific after-hours catalyst established. - It closed October 15 at $0.26 after a +8.60% regular-session move. - Available October 15 coverage cited biotech-sector strength, with XBI up 2.2%, as a backdrop; the company’s press-release page shows no October 15 announcement. - The broader market’s close was mixed, making sector strength the more relevant context.