GoPro rockets on stake disclosure; Sono Group eyes Sports One tie-up

Premarket movers see GoPro surge around 80% after Bloomberg reported YouTube creator Mark Fischbach (Markiplier) disclosed an 8.5% stake, sparking retail buying, while Sono Group jumps about 50–55% on news of a non-binding letter of intent to merge with Sports One to form a public vehicle focused on pro sports franchises and analytics. Other notable moves include Robinhood and Duolingo rising on analyst upgrades and Novartis edging higher on positive trial data, as stock futures pointed to a softer start for major indexes.