Solstice Advanced Materials is trading at $64.88, up 11.75%, with no verified October 5 after-hours company announcement or news report explaining the move. - Its latest listed release scheduled third-quarter results for November 4. - Published coverage dates the previously announced merger termination and $500 million buyback to late August, so they do not establish a fresh catalyst. - Market context was broadly positive, but does not establish that sentiment caused the larger after-hours move.