---
schema_version: "secwatch.filing_event.v1"
accession: "0001552000-24-000027"
form_type: "8-K/A"
ticker: "MPLX"
cik: "0001552000"
company_name: "MPLX LP"
filed_at: "2024-08-06T23:59:59+00:00"
generated_at: "2026-05-31T12:15:19.049237+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# MPLX amends 8-K to disclose CEO Mannen compensation: base $1.4M, LTI $12M

## Summary
- Effective Aug 1, Maryann T. Mannen's base salary as CEO raised to $1,400,000; target bonus 165% of salary.
- Mannen received one-time LTI award of $2,917,000; annualized LTI target award value $12,000,000.
- Michael J. Hennigan, now Executive Chairman, base salary reduced to $1,050,000; no 2024 LTI change.
- Hennigan's LTI target award value expected to reduce to $8,880,000 for 2025.
- Compensation changes approved by MPC board on July 31, 2024; MPLX contracts with MPC for personnel.

## SEC filing metadata
- accession: 0001552000-24-000027
- form_type: 8-K/A
- ticker: MPLX
- cik: 0001552000
- company_name: MPLX LP
- filed_at: 2024-08-06T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1552000/000155200024000027/0001552000-24-000027-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1552000/000155200024000027/mplx-20240511.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001552000-24-000027
- JSON: https://secwatch.observer/filing/0001552000-24-000027.json
- Plain text: https://secwatch.observer/filing/0001552000-24-000027.txt

## Key facts
- Executive change
  Michael J. Hennigan changed role as Executive Chairman at MPLX LP.
  - Action: transitioned
  - Role: Executive Chairman
  source text: the board of directors of MPC approved the compensation changes below in connection with the appointment of Ms. Mannen to Chief Executive Officer of MPC and the transition of Mr. Hennigan to Executive Chairman of the board of directors of MPC.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1552000/000155200024000027/0001552000-24-000027-index.htm
- Executive change
  Maryann T. Mannen was appointed as Chief Executive Officer at MPLX LP.
  - Action: appointed
  - Role: Chief Executive Officer
  source text: the board of directors of MPC approved the compensation changes below in connection with the appointment of Ms. Mannen to Chief Executive Officer of MPC and the transition of Mr. Hennigan to Executive Chairman of the board of directors of MPC.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1552000/000155200024000027/0001552000-24-000027-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.