EPAM Systems is trading at $127.68 (-4.32%), with the after-hours catalyst unclear. - On October 27, EPAM Systems fell 3.03% during regular trading, while the S&P 500 rose 0.60%. - No verified after-hours company announcement explaining the additional decline was found; available company news chiefly concerned its November 5 earnings date. Greenhaven Associates’ reported exit is a recent 13F disclosure, but available evidence does not establish it as the direct cause.