Oil & Energy Microsectors U.S. Big Oil Index 3X ETN NRGU – Up 43.7% Microsectors Oil & Gas Exp. MicroSectors U.S. Big Oil Index 3X Leveraged ETN (NRGU): ETF Research Reports The reading indicated a decline from an average of 439K in the first eight months of the year, as high inflation and interest rates started to weigh on the economy.