Stock futures were rising Tuesday as investors hoped for confirmation of a second round of peace talks between the U.S. and Iran.

These stocks were making moves in premarket trading:

Apple slipped 0.6%. The iPhone maker said late Monday that Tim Cook will be stepping down as CEO, effective Sept. 1. John Ternus, currently Apple's senior vice president of hardware engineering, will replace Cook.

Amazon.com rose 2.7% after the online retailer said it would invest an additional $5 billion in Anthropic, the developer of the Claude artificial-intelligence large-language model. The total investment could be as high as $25 billion if the partnership hits certain milestones.

Shares in chip makers with ties to Amazon also were rising after the investment was announced. Marvell Technology climbed 2.7% and Astera Labs jumped 6.8% ahead of the opening bell.

Alaska Air dropped 3.5% after the airline suspended its full-year guidance, citing higher fuel costs. Alaska Air also reported a wider-than-expected loss for the first quarter.

Avis Budget Group surged 10%, extending one of the wildest short squeezes in recent memory. Shares in the car rental company have risen more than 400% over the past month. Just two investors effectively own more than 100% of Avis's stock outstanding, by Barron's calculations.

AXT plunged 6.3% after the semiconductor wafer substrate maker said it intends to sell shares in a public offering. The stock has jumped 5,867% over the past year, surging thanks to the boom in data-center construction driving up demand for its products.

UnitedHealth Group rose 0.6% ahead of first-quarter earnings from the health insurer.

Earnings reports are also expected Tuesday from GE Aerospace, RTX, Danaher, Northrop Grumman, 3M, D.R. Horton, MSCI, Halliburton, Tractor Supply, Equifax, Intuitive Surgical, Chubb, Capital One, Interactive Brokers, and United Airlines.