U.S. stocks traded mixed on Monday, with the Dow Jones index down about 100 points, while several individual names posted outsized gains on earnings beats, clinical-trial updates, analyst actions and takeover news. Varex Imaging Corp led the session's notable movers, rising 48.4% to $18.42 after reporting quarterly earnings of 31 cents per share, ahead of the 21-cent analyst consensus, despite quarterly sales of $210.500 million missing the $213.940 million estimate. The company also said it will be acquired by Teledyne. Other large gainers included Bowman Consulting Group, up 55.1% to $42.24 after better-than-expected second-quarter results and an acquisition agreement with Bernhard Capital Partners, and MarineMax, which rose 45.8% to $52.05 after announcing it will be acquired by Blackrock Infrastructure's Safe Harbor. Biotech names also advanced after clinical updates, including AbCellera Biologics and Silence Therapeutics, while Archer Aviation climbed after signing definitive agreements tied to Boeing subsidiaries.