Bullish Big Oil Microsectors U.S. Big Oil Index 3X ETN NRGU – Up 13.5% Oil prices jumped recently after Saudi indicated that OPEC could slash output. MicroSectors U.S. Big Oil Index 3X Leveraged ETN (NRGU): ETF Research Reports Wall Street was downbeat last week mainly due to Federal Reserve Chair Jerome Powell’s comments at the Jackson Hole economic symposium that the central bank will remain committed to fight inflation.