US equity markets are poised for gains at Wednesday's open, with S&P 500 Index futures climbing 0.7% by 7:42 a.m. in New York. The premarket advance sets up a positive start for major indices following overnight strength in Asian and European markets.

Micron Technology's latest forecast is driving renewed enthusiasm for artificial intelligence plays, breathing fresh life into the AI trade that has dominated market sentiment this year. Semiconductor stocks typically lead on AI optimism, with chipmakers seeing increased demand projections.

The catalyst comes as investors parse corporate earnings and economic data ahead of the Federal Reserve's policy meeting later this week. Technology shares have outperformed recently on AI infrastructure spending expectations, while energy and financials lag the broader market advance.

Wednesday's early action suggests momentum stocks will continue attracting buyers, with the S&P 500 Index futures up nearly three-quarters of a percent entering the final trading week of June. Volume trends will confirm whether dip-buyers are returning to favor growth names.