MPLX LP (MPLX) Prices $1B Senior Notes Offering

MPLX LP (NYSE: MPLX) announced today that it has priced $1,000,000,000 in aggregate principal amount of 4.950% senior notes due 2032 (the "Notes") in an underwritten public offering. The Notes were offered at a price to the public of 99.433% of par.

MPLX intends to use the net proceeds from this offering to repay, redeem or otherwise retire some or all of its (i) 3.500% senior notes due December 2022 (including the portion of such notes for which Andeavor Logistics LP is the obligor) and (ii) 3.375% senior notes due March 2023, and in the interim may use such net proceeds for general partnership purposes.

The closing of this offering is expected to occur on Aug. 11, 2022, subject to satisfaction of customary closing conditions.

Barclays Capital Inc., Mizuho Securities USA LLC and Wells Fargo Securities, LLC are acting as joint book-running managers for this offering.

This offering is being made only by means of a prospectus and related prospectus supplement, which may be obtained for free by visiting the Securities and Exchange Commission's website at http://www.sec.gov. Alternatively, copies may be obtained by contacting the following, who are acting as representatives of the underwriters:

Barclays Capital Inc.c/o Broadridge Financial Solutions1155 Long Island AvenueEdgewood, NY 11717Toll-Free: 1-888-603-5847Email: [email protected]

Mizuho Securities USA LLC1271 Avenue of the AmericasNew York, NY 10020Attn: Debt Capital MarketsToll-free: 1-866-271-7403

Wells Fargo Securities, LLC608 2nd Avenue South, Suite 1000Minneapolis, MN 55402Attn: WFS Customer ServiceToll-free: 1-800-645-3751Email: [email protected]

This news release shall not constitute an offer to sell or a solicitation of an offer to buy any securities, nor shall there be any sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

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