Gelteq is trading 23.1% up at $0.53 in after-hours, with the catalyst unclear. - Compared with the provided regular-session close of $0.43, shares had fallen from $0.52 on October 9 to $0.43 on October 19. - No confirmed Gelteq announcement or other company-specific catalyst dated October 19 was identified; available company-news listings show earlier releases. - Broader indexes were higher, but the evidence does not establish that market sentiment explains this after-hours move.