South Korea's Kospi index crashed 10 percent, triggering a circuit breaker and halting trading across the market. The abrupt decline reflects deepening investor concerns over global economic stability and a persistent rout in technology stocks, setting a negative tone for U.S. equity futures, which had already shown weakness overnight.

U.S. tech futures slid overnight, extending a recent downturn as the Nasdaq Composite traded down 0.2 percent at 24,932. That modest index dip belies significant individual stock movements. Nvidia shares dropped 5.0 percent to $196.51, leading declines among chipmakers, while Tesla fell 1.2 percent to $309.22. Both names remain under pressure as investors reassess growth multiples in a tightening liquidity environment.

Investors are rotating out of speculative assets into defensive positions. This shift reflects growing skepticism about the sustainability of recent tech sector gains without clear catalysts.

Not all large-cap tech is suffering. Microsoft rose 1.9 percent to $389.10, Alphabet gained 2.1 percent to $326.56 and Apple posted a gain of 1.2 percent to $336.91. This divergence favors companies with strong free cash flow, diversified revenue streams and established market positions over pure growth plays. Trim positions in companies carrying elevated debt or unproven business models; the market will continue to reward profitability and strong balance sheets.