Arcturus Therapeutics is trading 5.27% lower at $13.12 in pre-market; no company-specific announcement explaining the September 28 move was identified. - This compares with its September 25 close of $13.85. - The move coincides with weaker risk-off markets: the S&P 500 is down 0.50% and Nasdaq is down 0.90%, amid higher oil, rising yields and renewed U.S.-Iran tensions. This is market context, not a confirmed stock-specific cause. - The latest major company news was released September 23.