Active broad-market exchange-traded funds in Wednesday's regular session: SPDR Select Sector Fund - Financial ( XLF ): -1.1% United States Oil Fund ( USO ): -3.8% iShares MSCI Emerging Index Fund ( EEM ): +0.7% iPath S&P 500 VIX Short Term Futures ETN ( VXX ): +0.7% United States Oil Fund ( USO ) was down 3.9%. U.S. stocks were mixed at session's half, fter soft retail sales and inflation data coupled with a shooting in Virginia dampened Wall Street's optimism ahead of the Federal Open Market Committee policy announcement.