System1 is trading at $2.20, up 5.26% in after-hours trading on October 16, 2026, from the regular-session close of $2.10; no verified company-specific announcement or clear catalyst was found. - The rise was opposite the broader market’s decline, which does not explain the move. - Regular-session volume was 118.93K, below the 65-day average of 558.29K.