Today's biggest winners and losers in the stock market.

On this episode of Stock Movers: 

Listen for comprehensive cross-platform coverage of the US market close as heard on Bloomberg Television, Bloomberg Radio, and YouTube with Romaine Bostick, Katie Greifeld, Carol Massar and Tim Stenovec.

- UnitedHealth (UNH) reported first quarter profit that blew past Wall Street expectations and boosted its outlook for the year, a sign of the health conglomerate’s progress toward rebuilding credibility with investors after a collapse a year ago. Revenue in the quarter topped analysts’ views. The company’s medical-loss ratio, which shows how much premium revenue is paid out for care, was 83.9%, more favorable than Wall Street anticipated. Shares rallied in Tuesday trading.

- Apple (AAPL) shares declined in the first full trading day after it announced that Tim Cook would be stepping down as CEO to become executive chairman. Cook told employees on Tuesday that he is “healthy” and plans to serve as executive chairman for a long time. Cook made the comments in an all-hands meeting with staff, following the announcement that he will pass the reins to hardware chief John Ternus on Sept. 1. The two executives held the meeting in the Steve Jobs Theater at the company’s headquarters in Cupertino, California. 

- GE Aerospace (GE US)’s first-quarter profit beat Wall Street’s expectations as the jet-engine maker works to sidestep disruptions tied to the war in Iran. Adjusted earnings were $1.86 a share, the company said in a statement Tuesday, above the $1.60 expected by analysts in a Bloomberg survey. Strong demand for air travel pushed sales up nearly 30% from a year ago, also exceeding analyst estimates. The stock slipped after the war began in late February and has trailed the broader market this year.