
In late 2015, MPLX (i.e., Marathon Petroleum) bought out and merged in the Utica Shale’s premier midstream company, MarkWest Energy, for $15 billion (see
MarkWest Energy Investors/Unitholders Approve Merger with Marathon). The “new” MarkWest, aka MPLX, plays on a much larger stage now, including the ownership and operation of major assets in the Permian Basin and the Bakken Shale, in addition to the Marcellus/Utica. However, the M-U still plays a starring role for the company. MPLX recently issued its first quarter 2025 update. CEO Maryann Mannen said most of the company's first quarter profits were from its natural gas and NGL segment in the Northeast.
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