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

On this episode of Stock Movers:

- Costco (COST) shares are up, erasing an earlier decline, after the club chain reported strong second-quarter results. While bears point out that paid membership growth rates slowed during the quarter, Morgan Stanley attributes the deceleration to fewer new warehouse openings. Costco’s premium valuation is also a point of contention, as it trades at about 47 times forward earnings, which is ahead of Walmart and well above peer BJ’s Wholesale. Shares are up 16% year-to-date while the S&P 500 Index has slid 1.1%.

- Gap (GAP) reported fourth-quarter sales and profit that came in slightly below expectations, as two of its apparel chains underperformed. Old Navy, the company’s biggest brand, and Athleta, its smallest, missed comparable-sales estimates, while Gap and Banana Republic beat. Shares of Gap fell as much as 11% on Friday. That erased the stock’s gain for the year and was the biggest intraday drop since May.

- Day One Biopharmaceuticals (DAWN) saw its shares leap as much as 66%, the most intraday since June 2022, after Servier agreed to acquire the biotech company for $21.50 per share in cash, representing a total equity value of approximately $2.5 billion. Servier agreed to pay $21.50 a share for Day One in a deal that’s expected to close in the second quarter, the companies said on Friday. That’s a 68% premium to Day One’s closing price on Thursday.

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