Stocks remained mixed Wednesday afternoon ahead of the central bank’s policy statement at 2 p.m. ET. The Nasdaq held on to a 0.3% gain. But the Dow Jones industrial average and the S&P 500 fell 0.3% and 0.1%, respectively. Volume was running mixed in the stock market today. Nasdaq trade was tracking sharply higher compared with the same time Tuesday. NYSE turnover was running vastly lower.