U.S. Stock Futures Mixed as Chip Stocks Fall

U.S. stock-index futures opened mixed Tuesday morning. The S&P 500 futures fell 0.2 percent, Nasdaq-100 futures dropped 1.1 percent, and Russell 2000 futures rose 0.4 percent. Samsung Electronics shares declined overnight after the company released preliminary second-quarter figures.

A Chinese artificial-intelligence company said it is developing its own chip intended for inference tasks rather than model training. Shares of a major graphics-chip maker declined 2.2 percent.

A payment-processing company rose 5.5 percent after several large banks held preliminary discussions to acquire one of its debit-card networks.

An electric-vehicle maker fell 10 percent after filing to sell 75 million shares of common stock. The same filing included an updated revenue outlook for the next quarter. A biotechnology firm more than doubled after an announcement that it would be acquired at $85 per share in cash.