New Delhi, July 28 -- US stock futures pointed to a weaker open on Tuesday, July 28, as global semiconductor stocks came under renewed selling pressure amid mounting investor concerns over the returns on billions of dollars of artificial intelligence (AI) spending. Sentiment also remained cautious ahead of a busy week of central bank policy decisions.

Nasdaq-100 futures fell 0.9%, while S&P 500 futures slipped 0.1%. In contrast, Dow Jones Industrial Average futures rose 123 points, or 0.2%.

Among individual stocks, Micron Technology declined 4.5%, while Marvell Technology and Advanced Micro Devices (AMD) each fell around 3% in pre-market trading.

The weakness in semiconductor stocks followed a sharp sell-off in South Korea, where SK Hy...