Fir Tree E&P Holdings: Midstates Petroleum (MPO): Mississippi Lime/Eagle Ford (This is most likely Ecostims' customer B/C very focused on cost. Sandridge Energy (SD): MidContinent (This might be Ecostims' customer) Memorial Production Partners(Amplify Energy APFY): Permian Ultra Petroleum (UP):Green River Bonanza Creek (BCEI): Niobrara