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 Romaine Bostick, Katie Greifeld, Carol Massar and Emily Graffeo.

- IBM (IBM) shares plunged on Monday, after the artificial intelligence startup Anthropic said its Claude Code tool can help with modernizing COBOL, a dated programming language that’s mainly run on IBM computers. Shares sank 13% in their biggest one-day percentage loss since October 2000. With the decline, the stock is now down 27% in February, on track for its biggest one-month percentage decline since at least 1968, according to data compiled by Bloomberg.

-Arcellx (ACLX) shares surge as much as 78% — a record — to an all-time high after Gilead Sciences agreed to acquire the biotech company for $115 per share in cash and one contingent value right of $5 per share. Stifel views the deal as a “a near-term better-case scenario” for Arcellx.

DoorDash (DASH) stock slid Monday as investors reacted to a viral post from a research group describing the food-delivery company as a "poster child" for risks from AI agents. A company cofounder responded on X after the report sparked debate on the social media platform over the weekend.

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 Romaine Bostick, Katie Greifeld, Carol Massar and Emily Graffeo. - IBM (IBM) shares plunged on Monday, after the artificial intelligence startup Anthropic said its Claude Code tool can help with modernizing COBOL, a dated programming language that&rsquo;s mainly run on IBM computers. Shares sank 13% in their biggest one-day percentage loss since October 2000. With the decline, the stock is now down 27% in February, on track for its biggest one-month percentage decline since at least 1968, according to data compiled by Bloomberg. -Arcellx (ACLX) shares surge as much as 78% &mdash; a record &mdash; to an all-time high after Gilead Sciences agreed to acquire the biotech company for $115 per share in cash and one contingent value right of $5 per share. Stifel views the deal as a &ldquo;a near-term better-case scenario&rdquo; for Arcellx. DoorDash (DASH) stock slid Monday as investors reacted to a viral post from a research group describing the food-delivery company as a "poster child" for risks from AI agents. A company cofounder responded on X after the report sparked debate on the social media platform over the weekend.

Listen for five-minute conversations on today's biggest winners and losers in the stock market. 

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Listen for five-minute conversations on today's biggest winners and losers in the stock market.&nbsp;
Subscribe for analysis on the companies making news in global equity markets. Episodes are published throughout the day to track stock moves from New York, London, Frankfurt and Paris. Join us for investment news covering technology, energy, finance, health care, communications, industrials, utilities, consumer staples, materials, real estate and more.

Listen for news on today's biggest winners and losers in the stock market.

Stock Movers

Closing Bell: IBM Plunges, Door Dash Sinks Arcellx Soars

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