Fiserv is trading 12.32% higher at $51.61 in after-hours trading, with no identified company-specific catalyst for the surge. - Shares closed at $45.95 on September 23, 2026; no earnings release, filing, or major company-specific announcement explaining the move was identified. - Fiserv’s latest official release, dated September 22, described Clover’s expanded Canadian sports and entertainment footprint, but available coverage does not directly connect it to the move. - Broader markets declined, making a global explanation less convincing.