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

On this episode of Stock Movers:

- Billionaire activist Bill Ackman has proposed a bid for Universal Music Group (UMG NA) — the world’s largest music company, which houses the likes of Taylor Swift, Drake and Sabrina Carpenter — to increase returns on one of his hedge fund’s biggest holdings.

- Broadcom (AVGO) shares are up after the chipmaker announced a long-term agreement with Google to develop and supply Tensor Processing Units.

- The US Medicare program will pay private insurers 2.48% more in 2027, a meaningful improvement over the initial rates the agency proposed in January. Shares of major insurance companies jumped on the news in premarket trading on Tuesday, with UnitedHealth Group Inc. up 6.6%, Humana Inc. rising 11%, and CVS Health Corp. up 5.8%.