Stocks making the biggest moves midday: Nvidia, Oracle, Constellation Energy, AT&T and more

Check out the companies making headlines in midday trading: Nvidia — The chipmaker tumbled nearly 17% as the performance of a language model from Chinese startup DeepSeek raised questions about the amount of investment in artificial intelligence. With that performance, the high-flying AI name is on track to notch its worst day since March 2020. Chipmakers — Nvidia wasn't the only semiconductor company falling sharply on the DeepSeek developments. Broadcom dropped more than 17%, while Micron fell more than 11%. Advanced Micro Devices slid more than 6%. The VanEck Semiconductor ETF (SMH) slid close to 10%. Microsoft , Oracle — The well-known tech giants slid more than 2% and 13%, respectively, as investors wondered if their large investments in AI data centers wouldn't pay off. Microsoft said it plans to spend $80 billion on the construction of these centers in the 2025 fiscal year, with about half of that money directed toward projects within the U.S. Oracle is one of the backers for the AI infrastructure project called Stargate that was announced by President Donald Trump last week. Power stocks — Power companies tied to the development of AI data centers also struggled. Constellation Energy and Vistra plummeted more than 20% and 28%, respectively. GE Vernova and Talen Energy both dropped more than 21%. Crypto stocks — Stocks tied to the price of bitcoin came under pressure from the tech stock rout. Coinbase and MicroStrategy fell more than 6% and 1%, respectively. Bitcoin miners that power AI ventures suffered deeper losses. Core Scientific slid more than 29%, as did TeraWulf . Iren , formerly known as Iris Energy, fell more than 24%. AT & T — Shares moved more than 6% higher after the telecommunications giant reported fourth-quarter adjusted earnings of 54 cents per share, topping the 50 cents expected from analysts polled by FactSet. Its revenue of $32.3 billion also exceeded the $32.02 billion consensus estimate. SoFi Technologies — Shares dropped 10.3% after the financial services platform posted a downbeat outlook for the first quarter, overshadowing the company's better-than-expected earnings and revenue results. Travel + Leisure — The stock rose just over 2% after Bank of America double upgraded it to buy from underperform. The firm said it sees the company reaching double-digit earnings per share growth this year amid a more resilient backdrop for leisure travel. Titan Machinery — The equipment retailer jumped 10.4% on the heels of Baird's upgrade to outperform from neutral. Baird said the stock should be helped by shrinking inventories. Exelixis — The biotechnology stock popped slightly over 1% on the back of Morgan Stanley's upgrade to overweight from equal weight. The firm called Exelixis' valuation "undemanding." Ralph Lauren — The apparel stock fell 3.2% following a downgrade to market perform from outperform at Raymond James. The investment firm said Ralph Lauren has limited upside due to its recent stock rally and the negative effect of the strengthening U.S. dollar on its financials. — CNBC's Michelle Fox, Tanaya Macheel, Pia Singh, Sean Conlon and Jesse Pound contributed reporting.