Premarket movers: CoreWeave, Nvidia rally; Fossil, Tandy Leather jump

 U.S. stock index futures were mixed on Wednesday, with technology shares leading gains as an upbeat financial outlook from AI cloud infrastructure provider CoreWeave and strong demand for Anthropic's initial public offering helped revive optimism around artificial intelligence. The gains came as investors looked for signs that demand for AI infrastructure can continue to support the sector's rapid expansion. 

By 05:36 ET, Nasdaq 100 futures had climbed 471 points, or 1.7%, while S&P 500 futures had gained 56 points, or 0.7%. Dow futures, meanwhile, had edged down 30 points, or 0.1%.

Here are some of the biggest premarket U.S. stock movers today:

CoreWeave shares surged 13.7% in premarket trading after the AI cloud infrastructure provider reported third-quarter results that topped estimates on key metrics and raised its full-year revenue outlook. Revenue reached $3.66 billion, ahead of analyst expectations of $3.55 billion, while its adjusted loss of $0.95 per share was narrower than the $1.16 loss forecast.

The company raised its 2026 revenue guidance to between $13 billion and $13.3 billion, above the previous analyst consensus of $12.86 billion. CoreWeave also sought to address investor concerns about its debt levels, citing around $9 billion in expected customer prepayments and deposits over the next three months and saying it did not intend to issue additional parent-level unsecured debt through 2027. Its revenue backlog reached a record $133 billion, up 138% from a year earlier, with more than half expected to begin delivery by year-end.

Nvidia shares climbed 4.9% to $177.08 ahead of the opening bell, joining a broader rally in semiconductor stocks as CoreWeave's stronger outlook helped ease concerns about demand for AI infrastructure. The move also marked a recovery after recent pressure on the chipmaker's shares amid controversy surrounding Chief Executive Jensen Huang. Micron Technology rose 6.5%, Advanced Micro Devices gained 6.4%, Intel added 6.2% and Broadcom advanced 4.2%.

Valens Semiconductor shares jumped 6.8% in premarket trading after the company reported better-than-expected third-quarter 2026 results. Revenue rose 26% year-over-year to $21.91 million, above its guidance, while GAAP and non-GAAP gross margins came in at 62.2% and 64.4%, respectively, both ahead of expectations. Its adjusted EBITDA loss of $2.7 million was also narrower than the guided range.

Valens reaffirmed its full-year revenue forecast of $78 million to $81 million, saying it now expects results toward the upper end. The company also highlighted the launch of its VS6310 chipset for video-conferencing devices and a partnership with onsemi on high-volume automotive camera applications. Automotive revenue reached $7.9 million, with gross margin improving to 53.9% from 41.5% in the previous quarter.

Tandy Leather Factory shares rose 10.7% in premarket trading after the specialty leather retailer reported a sharp turnaround in third-quarter profitability. The company posted net income of $500,000, compared with a loss of $1.4 million a year earlier, while earnings per share improved to $0.06 from a loss of $0.17. Revenue increased 7.3% year-over-year to $18.5 million, and gross margin widened to 62.4% from 58.9%. Operating income climbed about 182% to $600,000, pointing to improved profitability across its retail and e-commerce operations.

Fossil shares surged 20.2% in after-hours trading after the accessories and watchmaker reported an unexpected third-quarter profit and raised its full-year revenue forecast. Adjusted earnings came in at $0.19 per share, compared with analyst expectations for a loss of $0.10, while revenue of $271.2 million topped estimates of $248.88 million. Fossil swung to net income of $11.7 million for the quarter ended October 3, 2026, from a loss of $39.9 million a year earlier.

Gross margin expanded 10.8 percentage points to 59.8%, helped by lower licensed-brand minimum royalties and improved product margins from full-price selling and sourcing initiatives. The company also raised its 2026 revenue outlook to $980 million to $990 million, above the previous analyst consensus of $966 million.