Investing.com - U.S. stock index futures were mixed on Wednesday, with the S&P 500 and Nasdaq edging higher after a bruising two-day selloff in technology and semiconductor shares. Investors were also looking ahead to earnings from memory chipmaker Micron for fresh clues on the outlook for artificial intelligence-related demand.

By 05:51 ET (09:51 GMT), S&P 500 Futures had risen 0.16% to 7,377 points, Nasdaq 100 Futures had gained 0.37% to 29,771.5 points, while Dow Jones Futures had slipped 0.19% to 52,054 points.

Technology stocks remained in focus, with investors assessing earnings updates and corporate announcements across the AI, semiconductor and data center sectors.

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

Absci shares surged 24% after the biotechnology company reported positive interim Phase 1 safety data for ABS-201, its investigational antibody treatment for hair loss. The company said the therapy was well tolerated across all dose cohorts, with no serious adverse events reported.

FuelCell Energy jumped 16% after announcing a strategic agreement with Fit Energy USA to provide up to 380 megawatts of clean power for data centers using its fuel cell technology. The agreement includes an initial 30 MW deployment scheduled to begin later this year.

Cerebras Systems tumbled about 14% after the AI chip designer forecast 2026 adjusted gross margins of 38% to 41%, below the 47% margin reported in the first quarter. The warning came in the company’s first earnings report since its high-profile initial public offering.

FedEx fell 7.3% after issuing a fiscal 2027 earnings outlook that missed Wall Street expectations. While the delivery giant reported fourth-quarter earnings and revenue above estimates, investors focused on weaker-than-anticipated profit guidance for the year ahead.

Bilibili rose 2.4% after the Chinese video-sharing platform unveiled a new $300 million share repurchase program. The buyback authorization will remain in place for 24 months and follows a period of improving profitability and revenue growth.