US equity futures experienced a surge in response to the closure of polls in key states on election night. The most significant volatility was observed in small-cap stocks, as reflected by the Russell 2000 Index futures, which initially climbed as much as 3.6% before settling at a 2.5% increase. This movement indicates increased investor activity in the riskier segments of the market.

Additionally, futures for the S&P 500 Index rose by 1.2%, while the Nasdaq 100 Index saw a gain of 1.3%. These fluctuations demonstrate the strong response of traders to unfolding election results, underscoring the market's sensitivity to political developments.