Molly R. Benson - 01 Mar 2026 Form 4 Insider Report for MPLX LP (MPLX)

Reporting relationship: Chief Legal Ofc & Corp Sec
Issuer ticker: MPLX
Reported as of: 01 Mar 2026
Net transaction value: -$168,895
SEC form: 4
Accepted by SEC: 03 Mar 2026, 19:21:27 UTC
Prior SEC filing: 16 Dec 2025
Source filing: View source filing
Reporting owner signature: /s/ Shane T. Pfleiderer, Attorney-in-Fact for Molly R. Benson

Key filing fact

Molly R. Benson filed Form 4 for MPLX LP (MPLX) on 03 Mar 2026.

Key facts

This page summarizes Molly R. Benson's Form 4 filing for MPLX LP (MPLX).
4 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 03 Mar 2026, 19:21.

Change

Previous filing in this sequence was filed on 16 Dec 2025.
Current net transaction value: -$168,895.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002005019 Primary reporting owner

Benson Molly R

Relationship: Chief Legal Ofc & Corp Sec
Address: C/O MPLX LP, 200 E. HARDIN STREET, FINDLAY
Signature: /s/ Shane T. Pfleiderer, Attorney-in-Fact for Molly R. Benson
Signature date: 03 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MPLX transaction

Common Units (Limited Partner Interests)

Award

Transaction value: $0
Shares: +8,803
Change %: +22%
Price: $0.000000
Shares after: 48,966
Date: 01 Mar 2026
Ownership: Direct

MPLX transaction

Common Units (Limited Partner Interests)

Tax liability

Transaction value: $36,361
Shares: -614
Change %: -1.3%
Price: $59.22
Shares after: 48,352
Date: 02 Mar 2026
Ownership: Direct

MPLX transaction

Common Units (Limited Partner Interests)

Tax liability

Transaction value: $73,433
Shares: -1,240
Change %: -2.6%
Price: $59.22
Shares after: 47,112
Date: 02 Mar 2026
Ownership: Direct

MPLX transaction

Common Units (Limited Partner Interests)

Tax liability

Transaction value: $59,102
Shares: -998
Change %: -2.1%
Price: $59.22
Shares after: 46,114
Date: 02 Mar 2026
Ownership: Direct

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

SEC remarks

The Reporting Person is the Chief Legal Officer and Corporate Secretary of MPLX GP LLC, the general partner of the Issuer. The Issuer is managed by the directors and executive officers of MPLX GP LLC.