U.S. stocks ended Thursday's session mixed, with the Dow closing at its highest level in five months and the broader market weighed by the worst single-session loss of value by a U.S. publicly traded company ever. Meanwhile, the Dow Jones Industrial Average (DJIA) finished the session up about 113 points, or 0.4%, at 25,527, marking its third straight gain and its highest close since Feb. 26, according to FactSet data. The story of the day, however, was Facebook's historic slide as investors responded to disappointing guidance from the social-media giant during its earnings update, pointing to expectations for lower ad revenue in the wake of its Cambridge Analytica scandal.