U.S. stock index futures fell slightly on the evening of February 20, with investors looking for more monetary policy clues from the minutes of the Federal Reserve meeting at the end of January。

Technology stocks continued to be under pressure, and chipmaker Nvidia (NASDAQ: NVDA) continued its downward trend in after-hours trading ahead of its fourth-quarter earnings release, which will be announced after the close on Wednesday (February 21)。

S & P 500 futures edged down to 4988 as of 19: 03 EST (00: 03 a.m. GMT).50 points, Nasdaq 100 futures down 0.2% to 17,566.50, Dow futures down slightly to 38632.0 points, all three indices remain close to historical highs。

On Feb. 20, Nvidia fell 1 in after-hours trading..4%, after falling more than 4% in the trading day。Nvidia has been at the center of an AI-driven valuation spike over the past year and is expected to report earnings per share of 4.$58, revenue 203.$700 million, both well above the level of a year ago。However, concerns about Nvidia's future and excessively high price-to-earnings ratios have triggered some profit-taking for the chipmaker, which has soared to record highs in recent sessions.。

The market is now waiting for the minutes of the Federal Reserve meeting at the end of January, which will be released later on Wednesday, for fresh clues on the direction of interest rates.。Although the Fed left interest rates unchanged during the meeting, it warned that continued inflation could keep US interest rates high through 2024.。Later in the day, other Federal Reserve spokesmen, such as Raphael Bostic and Michelle Bowman, will speak.。

In after-hours trading, Palo Alto Networks Inc. (NASDAQ: PANW) fell 19 percent after lowering its full-year guidance.。Peers Traddock (NASDAQ: CRWD) and Zscaler Inc (NASDAQ: ZS) also fell。