Stock futures were rising Tuesday as risk appetite returned following a rocky start to December.

These stocks were poised to make moves Tuesday:

Apple slipped 0.2% in premarket trading. The iPhone maker announced late Monday a shake-up of its artificial-intelligence team as it struggles to find its footing in a post-ChatGPT world. John Giannandrea, the company's senior vice president of machine learning and AI strategy, is retiring, with more of his portfolio getting spread out through Apple's organization. Apple shares have closed higher for six straight sessions.

MongoDB surged 23% ahead of the opening bell. The document database company raised its full-year outlook, a sign that the AI boom is still driving up demand for its program. MongoDB now forecasts annual adjusted earnings per share of $4.76 to $4.80 -- more than $1 above its previous guidance of $3.64 to $3.73.

Credo Technology jumped 18%. The company, which provides high-speed connectivity solutions for data centers, topped Wall Street's targets for fiscal second-quarter earnings and revenue. The excitement around AI has helped Credo to sell more of its active electrical cables, which are copper-based cables used to attach AI servers to networking switches.

Warner Bros. Discovery rose 2.1% after a report signaled that the bidding war for the entertainment company has been heating up. Streamer Netflix has sweetened its offer for Warner Bros.,, while Paramount Skydance and Comcast also have submitted second bids, The Wall Street Journal reported, citing people familiar with the matter. Warner Bros., Netflix, Paramount, and Comcast didn't immediately respond to requests for comment from Barron's.

Synopsys climbed 1.5%, following a 4.9% rally the previous session. Shares jumped on Monday after chip maker Nvidia said it had taken a $2 billion stake in Synopsys, which provides the electronic automation software that is used to design semiconductors.

Albemarle edged up 0.7% to $129.26 after Baird upgraded the lithium producer to Neutral from Underperform and raised its price target to $113 from $81. The new target still implies that Albemarle shares will slide 13% from their current level.

Marvell Technology added 1.2% in the premarket session. The chip maker is set to report its third-quarter earnings after the close of trading Tuesday. Analysts are expecting adjusted earnings of 74 cents a share on revenue of $2.07 billion, according to a FactSet poll. A year ago, Marvell reported earnings of 43 cents a share on $1.52 billion.