DISK is trading 3.72% higher at $40.18, with no direct cause established for the pre-market move. - It rose from the September 24 close of $38.74; no credible company-specific announcement, earnings release, or other overnight catalyst was identified for September 25, 2026. - DISK is the Tema Memory ETF, focused on memory and semiconductor infrastructure companies. - Broader U.S. futures are modestly higher, but do not confirm a macro explanation.