U.S. stock index futures saw slight gains Wednesday, anticipating the Federal Reserve's first interest rate cut in over four years. Investors largely expect a 50-basis point reduction, though uncertainty remains.

SolarEdge Technologies is down 5% after shares of the solar-power-equipment maker were downgraded to Underperform from Hold at Jefferies and the price target cut to $17 from $27. S&P 500 futures are up 0.3%. Dow Jones Industrial Average futures are adding 0.2%.

Wall Street's main indexes closed higher on Friday as investors honed in on the chance of a bigger interest rate cut by the Federal Reserve next week, with rate-sensitive small cap stocks outperforming.