MPLX Working on $450M Marcellus Gathering System Expansion

In 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, now plays on a much larger stage, owning and operating major assets in the Permian Basin, the Bakken Shale, and the Marcellus/Utica. However, the M-U still plays a starring role for the company. MPLX recently issued its fourth quarter 2025 update. Based on 4Q earnings materials, MPLX's operations in the Marcellus and Utica (Northeast) region are characterized by near-capacity utilization and significant ongoing infrastructure expansions.

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