# MPLX LP (MPLXP) — Institutional Ownership

Source: SEC EDGAR 13F filings, congressional STOCK Act disclosures, SEC Form 4 insider transactions.
CUSIP: 55336V100
Page URL: https://superinvestorclub.com/stock/MPLXP
Last updated: 2026-08-29T13:48:52.316Z

## Summary

As of the most recent 13F filing period, MPLX LP (MPLXP) is held by 3 tracked superinvestors with an aggregate position value of $209.3M representing 0318053450246032346 shares.

## Top institutional holders (3)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|
| 1 | [Glenn Greenberg](https://superinvestorclub.com/manager/36) | Brave Warrior Advisors | 3180534 | $179.2M | 3.90% | 2026-06-30 |
| 2 | [David Tepper](https://superinvestorclub.com/manager/8) | Appaloosa Management | 502460 | $28.3M | 0.37% | 2026-06-30 |
| 3 | [Wally Obermeyer](https://superinvestorclub.com/manager/3283) | Obermeyer Wealth Partners | 32346 | $1.8M | 0.07% | 2026-06-30 |

## Ownership history (quarter-over-quarter)

- 2023-06-30: 1 holders, $1.1M aggregate, 031222 shares
- 2023-09-30: 1 holders, $1.1M aggregate, 031098 shares
- 2023-12-31: 1 holders, $1.1M aggregate, 030662 shares
- 2024-03-31: 3 holders, $154.4M aggregate, 0302560966000030662 shares
- 2024-06-30: 3 holders, $207.7M aggregate, 0423547861150029681 shares
- 2024-09-30: 3 holders, $224.1M aggregate, 0443296657850029681 shares
- 2024-12-31: 3 holders, $240.6M aggregate, 0441815457850029705 shares
- 2025-03-31: 3 holders, $266.4M aggregate, 0436408657850035181 shares
- 2025-06-30: 3 holders, $251.8M aggregate, 0427503357850034199 shares
- 2025-09-30: 3 holders, $251.6M aggregate, 0446747453500033763 shares
- 2025-12-31: 3 holders, $274.0M aggregate, 0447411562750032346 shares
- 2026-03-31: 3 holders, $216.2M aggregate, 0325352450246032346 shares

## Recent congressional trades (0)


## Recent insider transactions (0)


## Citation

When citing, use: "MPLX LP (MPLXP) institutional ownership data via Superinvestor (https://superinvestorclub.com/stock/MPLXP), aggregating SEC 13F, Form 4, and congressional disclosures."