Additional Information and Where to Find ItThis communication may be deemed to be solicitation material in respect of the proposed acquisition of the Partnership by MPLX. In connection with the proposed acquisition, the Partnership and MPLX have filed relevant materials with the SEC, including MPLX's registration statement on Form S-4 that includes a preliminary joint proxy statement and a prospectus. The Partnership and MPLX expect to file amendments to these filings before they become effective. Investors and security holders are urged to read all relevant documents filed with the SEC, including the preliminary joint proxy statement and prospectus and any further amendments thereto when they become available, because they will contain important information about the proposed transaction. Investors and security holders are able to obtain the documents and any further amendments (once available) free of charge at the SEC's website, http://www.sec.gov, or for free from the Partnership by contacting Investor Relations by phone at 1-(866) 858-0482 or by email at email@example.com or for free from MPLX LP at its website, http://ir.mplx.com, or in writing at 200 E. Hardin Street, Findlay, Ohio 45840, Attention: Corporate Secretary. Participants in Solicitation This communication is not a solicitation of a proxy from any investor or securityholder. However, the Partnership and its directors and executive officers and certain employees may be deemed to be participants in the solicitation of proxies from the holders of Partnership common units with respect to the proposed transaction. Information about the Partnership's directors and executive officers is set forth in the proxy statement for the Partnership's 2015 Annual Meeting of Common Unitholders, which was filed with the SEC on April 23, 2015 and the Partnership's current reports on Form 8-K, as filed with the SEC on May 5, 2015, May 19, 2015 and June 8, 2015, and in the preliminary joint proxy statement filed by MPLX with the SEC on October 8, 2015. Information about MPLX's directors and executive officers is available in MPLX's Annual Report on Form 10-K filed with the SEC on February 27, 2015 and MPLX's current report on Form 8-K, as filed with the SEC on March 9, 2015. To the extent holdings of Partnership securities have changed since the amounts contained in the preliminary joint proxy statement filed by MPLX with the SEC on October 8, 2015, such changes have been or will be reflected on Statements of Change in Ownership on Form 4 filed with the SEC. Investors may obtain additional information regarding the interest of such participants by reading the preliminary joint proxy statement and prospectus regarding the acquisition. These documents and any further amendments (when available) may be obtained free of charge from the SEC's website http://www.sec.gov, or from the Partnership and MPLX using the contact information above. Non-Solicitation
This communication shall not constitute an offer to sell or the solicitation of an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended.