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 Katie Greifeld, Romaine Bostick, Carol Massar and Tim Stenovec.

- Masimo (MASI) stocks spiked around 34% in enormous volume on news that it would be acquired by Danaher for $180 a share in cash, or about $9.9 billion.

- TripAdvisor (TRIP) shares rose as much as 8.6%, the most intraday since Nov. 21, after Starboard Value LP delivered a letter to the online travel platform’s leadership highlighting prolonged underperformance and announced plans to nominate a majority slate of director candidates for the 2026 annual meeting.

- Genuine Parts (GPC) shares slump as much as 12% Tuesday — the most intraday since October 2024 — after the provider of automotive and industrial parts reported fourth-quarter sales and profit that fell short of Wall Street’s expectations. The firm also said it plans to separate its automotive and industrial businesses into two companies.