MPLX Director Garry Peiffer Receives 2,696-Share Award

What Happened

• Garry L. Peiffer, a director of MPLX GP LLC (the general partner of MPLX LP), was granted 2,696.387 shares (units) as his 2026 annual equity retainer on April 30, 2026. The award price is listed as $0.00 (a grant/award), so no cash was paid by the reporting person.

Key Details

• Transaction date: April 30, 2026; transaction code: A (award/grant).
• Shares awarded: 2,696.387; reported acquisition price: $0.00 (total cash paid = $0).
• Filing: This Form 4 is an AMENDED filing (filed Aug 5, 2026) to reflect the correct amount of the annual 2026 equity retainer award.
• Footnotes: F1 = represents the 2026 annual equity retainer; F2 = amendment corrects the award amount; F3 = the filing reflects the corrected beneficial ownership balance as of Apr 30, 2026 (the filing does not include any transactions after that date).
• Shares owned after transaction: the filing references a corrected balance as of Apr 30, 2026 but does not list the numeric total in the provided summary.

Context

• This was an equity retainer award (a grant), not an open-market purchase or sale—such awards are routine compensation for directors and do not by themselves indicate a buying or selling signal.
• The filing notes Peiffer is a director of MPLX GP LLC, which manages the issuer; this clarifies his insider status.