Prospectus summary
Prospectus summary This summary highlights selected information contained elsewhere in this prospectus. You should carefully read the entire prospectus, including “Risk Factors” and the historical and unaudited pro forma combined financial statements and related notes included elsewhere in this prospectus before making an investment decision. Unless otherwise indicated, the information in this prospectus assumes (1) an initial public offering price of $ per common unit (the mid-point of the price range set forth on the cover of this prospectus) and (2) that the underwriters do not exercise their option to purchase additional common units. You should read “Risk Factors” beginning on page 23 for more information about important factors that you should consider before purchasing our common units.Unless the context otherwise requires, references in this prospectus to “MPLX LP,” “our partnership,” “we,” “our,” “us,” or like terms, when used in a historical context, refer to the assets that MPC is contributing to us in connection with this offering. These assets include a 100.0% interest in MPLX Terminal and Storage LLC, which owns our butane cavern, and our 51.0% general partner interest in MPLX Pipe Line Holdings LP, the 100.0% owner of Marathon Pipe Line LLC and Ohio River Pipe Line LLC, which are the subsidiaries of MPC that own our pipeline systems and associated crude oil and product storage assets. When used in the present tense or prospectively, these terms refer to MPLX LP and its subsidiaries. References to “our general partner” refer to MPLX GP LLC. References to “MPC” refer collectively to Marathon Petroleum Corporation and its subsidiaries, other than us, our subsidiaries and our general partner. References to “Pipe Line Holdings” refer to MPLX Pipe Line Holdings LP. References to “MPL” and “ORPL” refer to Marathon Pipe Line LLC and Ohio River Pipe Line LLC, respectively. While we will only own a 51.0% indirect interest in MPL and ORPL through Pipe Line Holdings, we refer to the assets owned by MPL and ORPL as our assets. In addition, unless otherwise specifically noted, financial results and operating data are shown on a 100.0% basis and are not adjusted to reflect MPC’s 49.0% limited partner interest in Pipe Line Holdings. We have provided definitions for some of the terms we use to describe our business and industry and other terms used in this prospectus in the “Glossary of Terms” beginning on page B-1 of this prospectus.