CHPX is trading at $104.01, up 3.52%, with no clear CHPX-specific announcement or after-hours catalyst identified. - It closed at $100.47, down 1.91% for the session, before the after-hours move. - On September 28, major U.S. indexes fell as oil prices and Treasury yields rose amid uncertainty over U.S.-Iran negotiations; the risk-off backdrop may have weighed on the session. - The after-hours gain contrasts with the decline; available evidence does not establish the rebound’s driver.