MPLX LP 4

Director Garry L. Peiffer received an award of 1,232.166 MPLX LP common units on August 14, 2026, increasing his trust’s indirect holdings to 68,497 units.

On August 14, 2026, Garry L. Peiffer, a director of MPLX GP LLC (the general partner of MPLX LP), acquired 1,232.166 common units of MPLX LP as an award or similar acquisition at no stated purchase price, which increased the holdings of his revocable trust. Using the approximate indicated value of $69,313 for the transaction, this implies an effective per-unit value around the high‑$50s, consistent with recent market prices. Following this award, the trust reported beneficial ownership of 68,497 common units held indirectly. Based on the current market price of about $59.20 per unit, the post‑transaction position is worth roughly $4.1 million, indicating a substantial ongoing ownership stake aligned with unitholders.

Filing Facts

CIK

1552000

Ticker

MPLX

Form

4

Source Type

sec

Accession

0001193125-26-355727

Alert Tier

6