X0101 EFFECT 33 LIVE 2017-08-10 0001144204-17-039892 POS AM 0001384072 Vanguard Natural Resources, Inc. 333-202064 0001461334 Eagle Rock Energy Acquisition Co. II, Inc. 333-202064-15 0001461333 Eagle Rock Upstream Development Co II, Inc. 333-202064-14 0001461332 Eagle Rock Acquisition Partnership II, L.P. 333-202064-13 0001461338 Eagle Rock Energy Acquisition Co., Inc. 333-202064-12 0001461337 Eagle Rock Upstream Development Company, Inc. 333-202064-11 0001461336 Eagle Rock Acquisition Partnership, L.P. 333-202064-10 0001461330 Escambia Operating Co. LLC 333-202064-09 0001461329 Escambia Asset Co. LLC 333-202064-08 0001468366 VNR Holdings, LLC 333-202064-06 0001468367 Vanguard Natural Gas, LLC 333-202064-05 0001445198 Encore Clear Fork Pipeline LLC 333-202064-03 0001633675 Vanguard Operating, LLC 333-202064-01