Caseys General Stores is trading 33.83% higher at $799.36 in after-hours trading, after closing at $597.31 on September 23, 2026; no credible company-specific catalyst was found. - Searches found no company-specific announcement, earnings release, acquisition, or late-breaking catalyst dated September 23. - Investor Day materials from June 24 do not establish a connection to the move. - The broader market declined, so market sentiment does not explain the sharp gain.