Stock market today: Dow, S&P 500, Nasdaq futures steady after tech rally

US stock futures were little changed on Wednesday morning as investors awaited minutes from the Fed's September meeting. Futures on the Dow Jones Industrial Average (YM=F) slipped below the flat line. Futures on the S&P 500 (ES=F) and the Nasdaq-100 (NQ=F) traded roughly flat after the two indexes notched record highs the day before. Sentiment has turned more buoyant in markets this week as bullish earnings estimates have helped lift major indexes to all-time highs. But as Yahoo Finance's Brian Sozzi pointed out on Tuesday, those records belie a highly concentrated market, where the index's top three holdings (Nvidia (NVDA), Apple (AAPL), Microsoft (MSFT)) account for roughly a fifth of the S&P 500.