Expion360 is trading 7.36% higher at $5.69 in after-hours trading, with no verified company-specific catalyst identified. - It closed the September 22, 2026 regular session at $5.30, after gaining 9.28% during that session. - No company announcement, earnings release, analyst action, or late-breaking catalyst was verified. Market coverage also reported the stock higher without confirming a direct catalyst; the move suggests elevated volatility and speculative trading rather than a confirmed fundamental trigger.