FinanceNorth America The Midstream 50: Getting Ready Gregory Morris 2017/05/15 Log in to post comments Email this page 392 Among the 50 largest midstream companies in the U.S., the biggest move for 2016 was at No. 10 rather than No. 1. The top nine places in this magazine’s 2nd annual Midstream 50 were little changed but for MPLX LP, the MLP affiliated with Marathon Petroleum Corp., which vaulted 13 spots from 23rd place in the 2015 table to 10th in 2016 with its acquisition of MarkWest and dropdowns from its parent. The top three were unchanged: Kinder Morgan Inc., Energy Transfer Equity LP and Enterprise Products Partners LP held steady. Enbridge made a jump of two places to 4th with TransCanada Corp. and Williams both slipping a single spot to 5th and 6th, respectively. Spectra Energy, Plains All American and ONEOK all held steady at 7th through 9th.