Andeavor unitholders will receive 1.135 MPLX common units for each Andeavor common unit held. Marathon will receive 1.0328 MPLX common units for each Andeavor common unit held.

The enterprise value of the deal is listed at $14 billion.

Andeavor, formerly known as Tesoro, has refineries in California, Minnesota, New Mexico, North Dakota, Texas, Utah, Washington and Alaska. The companies are all based in Findlay, Ohio.

The deal is targeted to close in the second half of the year.