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

On this episode of Stock Movers:
- Mattel (MAT) shares plunged after the toymaker reported holiday results that fell short of analysts’ estimates and issued a 2026 forecast for lower profit. Shares of Mattel fell 32% in premarket trading on Wednesday, setting it up for its biggest fall on record if the losses hold.
- Robinhood (HOOD) shares fall after the company reported lower fourth-quarter profit as sharp declines in Bitcoin and other cryptocurrencies weighed on results at the online brokerage.
- Zillow (ZG) shares fall. Zillow Group forecasted first-quarter profit that falls short of analyst estimates as the home-search site balances legal costs from ongoing litigation and expenses from the company’s partnership with Redfin.