Wall St futures fall as chip selloff gathers pace; Netflix tumbles

Thursday's session had already set a weaker tone, with losses in chipmakers dragging the broader market lower. The main indexes were also on track for weekly declines, despite an initially upbeat start to the second-quarter earnings season from major banks and benign inflation data earlier in the week.

Geopolitical risks also loomed large. Iran said on Friday it had launched fresh attacks on U.S. facilities in the Gulf after a sixth straight night of U.S. strikes on Iranian military targets.

The escalation followed the breakdown of a brittle ceasefire reached last month and renewed concerns over energy flows through the Strait of Hormuz.

Meanwhile, U.S. President Donald Trump's fresh accusations that China meddled in U.S. elections risked complicating a fragile truce with Chinese leader Xi Jinping, just two months before a planned summit in Washington.

Among other premarket movers, Intuitive Surgical fell 10.8%, even after the medical device maker topped Wall Street estimates for second-quarter profit and revenue on strong demand for its surgical systems.