ASP Isotopes is trading 5.12% up at $2.77; available evidence does not establish why the shares are rising. - No new company announcement or clearly verified company-specific catalyst for September 30, 2026, appeared in available search results. The latest major update located was its September 8 Capital Markets Day. - Supplied market indices were up modestly, below the 0.5% threshold for attributing the move to broad-market strength. - An investor-rights investigation notice was among recent headlines, but does not confirm the cause.