Stocks making the biggest moves midday: Penn Entertainment, Metsera, Six Flags & more

Check out the companies making the biggest moves midday: TreeHouse Foods — The food processor rallied 23% after announcing it's being bought by European investment group Investindustrial for $22.50 per share in cash. That represents an 18% premium from Friday's close. The deal values TreeHouse at nearly $3 billion. Tech stocks — Names tied to the artificial intelligence trade roared back on news of a possible end to the U.S. government shutdown, which contributed to investors' risk-on attitude. Nvidia jumped nearly 3.5%, while AMD rose about 3.8%, and Broadcom gained 1.7%. Each of the "Magnificent Seven" stocks were in the green, with gains in Alphabet and Tesla leading the pack. Six Flags Entertainment — The amusement park operator fell 7% following a downgrade to equal weight from overweight at Morgan Stanley. The bank cited headwinds such as lower-than-expected pricing power, relatively narrow windows of operations and consumer softness for lower income households. Coinbase — The crypto exchange rose 3% after an upgrade to buy at Monness Crespi Hardt . "We think downside absent a full winter likely proportional to upside here," the research firm said. Penn Entertainment — The gambling rose more than 8% after CEO Jay Snowden disclosed the purchase of more than 34,000 shares . MP Materials — The rare earth mine operator rose 3% after a Deutsche Bank upgrade to buy from hold. The bank highlighted MP as a buying opportunity for investors looking for exposure to rare earths. Palantir — Shares of the defense technology stock popped 3%. The stock tumbled more than 11% amid the selloff in artificial intelligence-focused names last week. Metsera — The obesity drug developer tumbled 15% after Pfizer won a bidding war to acquire the company, beating out rival Novo Nordisk. Pfizer agreed to pay $86.25 per share for Metsera, a premium of nearly 4% to Friday's close. Rumble — The video-sharing platform's shares surged 10% after the firm secured a $100 million advertising commitment from Tether while announcing a deal to buy German AI firm Northern Data for about $767 million. Viasat — The communications company reported a narrower loss in the latest quarter with strength seen in communication services segment, prompting the stock to gain 5%. Raymond James also upgraded the shares following the results. Diageo — The spirits giant announced it's bringing in former Tesco chief Dave Lewis as new CEO to revive growth. The news triggered sent the stock up 5%. Lewis, who will join Diageo in 2026, is best known for cost-cutting and innovative marketing. — CNBC's Alex Harring, Lisa Kailai Han, Pia Singh and Michelle Fox contributed reporting.