Today's biggest winners and losers in the stock market, a look at the notable movers:
On this episode of Stock Movers:

- Apple (AAPL) is developing a screenless health and fitness tracker similar to Whoop Inc.'s wrist-worn device as part of an effort to rethink its smartwatch lineup and add new wearable technologies. The company has been exploring the category for several months and is now developing prototypes, with the effort having support from top executives, including Apple Executive Chairman Tim Cook and services chief Eddy Cue. The project remains in a preliminary phase, and if Apple proceeds with a release, the device likely won't debut before 2028, featuring a thin fabric band with a sensor-equipped computing module and distinguishing it from the Apple Watch.

- Sandisk (SNDK) shares are up 7.4% on Tuesday, after Rosenblatt Securities started coverage on the computer hardware and storage company with a buy rating and $2,400 price target, citing AI tailwinds to growth. The stock is the day’s biggest percentage gainer among S&P 500 Index components.

- Lennar (LEN) shares rise as much as 6.2%, the most intraday since June 24, after Berkshire Hathaway increased its stake in the homebuilder over three trading days.