US stock index futures subdued as oil, Treasury yields rise on Iran tensions

At 4:25 a.m. ET, Dow E-minis YMcv1 were up 7 points, or 0.01%, S&P 500 E-minis EScv1 dipped 6.25 points, or 0.08%, and Nasdaq 100 E-minis NQcv1 slipped 81 points, or 0.28%.

Equities were also under pressure from elevated yields on risk-free U.S. Treasuries, which reduce the appeal of taking on the added risk of buying stocks.

Investors are contending with seasonal weakness too. Since 1926, the benchmark S&P 500 has lost 0.7% on average in September, making it the weakest month for stocks and the only one with a negative average return, according to Fisher Investments, which cited data from Finaeon.

Major movers in the premarket session included Dell DELL.N, which gained 9.65% after raising its annual profit and revenue forecast.

The Magnificent Seven group of stocks was mixed, with Alphabet GOOGL.O and Tesla TSLA.O up 0.81% and 0.42% respectively, while Nvidia NVDA.O and Microsoft MSFT.O fell.