By Mackenzie Tatananni, George Glover, and Joe Woelfel

Stocks were rising Tuesday, a day after the Dow Jones Industrial Average kicked off the first full trading week of 2026 by surging to a record high.

These stocks were making moves Tuesday:

SanDisk surged 22% without an obvious catalyst, marking the stock's largest same-day percentage increase since Feb. 18, 2025, according to Dow Jones Market Data.

Vistra gained 3% after the electricity and power-generation company said it planned to buy Cogentrix Energy from Quantum Capital Group in a deal valued at about $4 billion, including cash, equity and debt. Vistra is bolstering its energy portfolio in a bid to meet growing demand in key markets, said President and CEO Jim Burke.

Valero Energy reversed earlier gains and fell 1.7%. Shares of the oil refiner closed up 9.2% on Monday, ending the session as the top-performing stock in the S&P 500. Valero is viewed as a potential beneficiary of any production increases from Venezuela following the U.S. capture and ouster of Venezuelan President Nicolás Maduro.

Oilfield-services stock Halliburton, which rose 3.7% on Monday, declined the same amount. SLB traded 0.6% lower following a 9% jump on Monday.

Palantir Technologies advanced 2.7% to $178.78 after Truist Securities analyst Arvind Ramnani initiated coverage on the shares with a Buy rating and $223 price target.

Advanced Micro Devices slid 3.5% after investors reacted to CEO Lisa Su's keynote speech at the CES tech trade show in Las Vegas. "We are just starting to realize the power of AI," Su said late Monday as she unveiled new AI chips and processors. AMD has gained 1.9% so far in 2026 and 71% over the past year.

Nvidia added 1.1%. CEO Jensen Huang said Monday at CES that the chip maker's next big AI graphics processing unit, Vera Rubin, was in "full production." Huang is scheduled to speak again at CES after the market closes on Tuesday.

Shares of Zeta Global, an AI-forward marketing company, climbed 8.9%. Zeta unveiled a strategic collaboration with OpenAI late Monday, saying it would use the ChatGPT maker's models to support its AI agent, Athena.

OneStream stock spiked 22%. The financial software company is nearing a take-private deal with buyout firm Hg Capital, Bloomberg reported, citing people familiar with the matter. A spokesperson for Hg declined to comment in an email to Barron's.

Microchip Technology jumped 9.2%. The company boosted its fiscal third-quarter net sales outlook to about $1.19 billion, higher than previous guidance of $1.1 billion to $1.15 billion. Analysts had been expecting net sales in the period of $1.14 billion. CEO and President Steve Sanghi cited a "fairly broad-based recovery" in most of Microchip's end markets.

Earnings reports are expected after the closing bell Tuesday from AAR Corp. and Penguin Solutions.

Write to George Glover at george.glover@dowjones.com and Joe Woelfel at joseph.woelfel@barrons.com

This content was created by Barron's, which is operated by Dow Jones & Co. Barron's is published independently from Dow Jones Newswires and The Wall Street Journal.

(END) Dow Jones Newswires

January 06, 2026 10:57 ET (15:57 GMT)

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