MPLX LP
MPLX- Exchange
- NYSE
- Industry
- Pipe Lines (No Natural Gas)
- SEC CIK
- 0001552000
In the last 90 days, MPLX LP insiders filed 0 open-market purchases and 1 sale; 641 institutions reported holding it in 13F filings for Q2 2026, worth $11.1B in total; Appaloosa is the only superinvestor holding it.
Holders of 5% or more of MPLX
Holders whose latest Schedule 13D or 13G filing reports 5% or more of MPLX LP, largest stake first. The change is against the holder's previous filing.
No holder currently reports owning 5% or more of MPLX LP on Schedule 13D or 13G.
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
8 Schedule 13D and 13G filings on MPLX LP, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| May 10, 20244:59 PM ET | Marathon Petroleum Corp | 13D/AOld format | – | – | – | SEC |
| Feb 9, 2024 | Blackstone Group Management L.L.C. | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2023 | Blackstone Group Management L.L.C. | 13G/AOld format | – | – | – | SEC |
| Oct 4, 20224:29 PM ET | Marathon Petroleum Corp | 13D/AOld format | – | – | – | SEC |
| Feb 11, 2022 | Blackstone Group Management L.L.C. | 13G/AOld format | – | – | – | SEC |
| Sep 22, 20214:31 PM ET | Marathon Petroleum Corp | 13D/AOld format | – | – | – | SEC |
| Feb 16, 2021 | Blackstone Group Management L.L.C. | 13G/AOld format | – | – | – | SEC |
| Jan 5, 20214:13 PM ET | Marathon Petroleum Corp | 13D/AOld format | – | – | – | SEC |
Form 144: proposed insider sales
2 notices from officers, directors and other affiliates planning to sell MPLX LP shares, newest first.
| Filed (ET) | Seller | Shares to sell | Market value | Planned sale | Broker | Filing |
|---|---|---|---|---|---|---|
| Nov 10, 20262:58 PM ET | Hagedorn Carl KristopherOfficer · Director | 3.51K | $199.3K | Nov 10, 2026 | Fidelity Brokerage Services LLC | SEC |
| Nov 18, 20242:22 PM ET | Hagedorn Carl KristopherOfficer · Director | 4.00K | $189.0K | Nov 18, 2024 | Fidelity Brokerage Services LLC | SEC |