MPLX LP
Ownership
Ownership Structure
Who owns MPLX LP (MPLX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 36.0% of the shares are freely tradable; institutional investors hold 20.4%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| ALPS Advisors Inc | 2.82 | 28,601,592 | +5.7 | 06/30/2026 |
| Amvescap Plc. | 1.80 | 18,266,606 | +0.4 | 03/31/2026 |
| Blackstone Inc | 1.51 | 15,350,683 | -2.3 | 03/31/2026 |
| The Goldman Sachs Group Inc | 1.23 | 12,507,539 | +0.3 | 03/31/2026 |
| Tortoise Midstream Energy Fund, Inc. | 1.04 | 10,500,469 | -20.8 | 06/30/2026 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.72 | 7,319,250 | +5.9 | 03/31/2026 |
| Kayne Anderson Capital Advisors LP | 0.58 | 5,862,925 | -14.1 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Alerian MLP ETF | 2.84 | 28,759,446 | +0.0 | 08/31/2026 |
| Invesco SteelPath MLP Income Y | 1.12 | 11,304,596 | +0.4 | 06/30/2026 |
| Kayne Anderson Energy Infrastructure | 0.57 | 5,748,396 | +0.0 | 11/30/2025 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Surma John P | Director | 95,448 | 5,507,337 $ | Aug 14, 2026 | direct |
| Helms Christopher A | Director | 86,208 | 4,974,225 $ | Aug 14, 2026 | direct |
| Peiffer Garry L. | Director | 69,313 | 3,999,373 $ | Aug 14, 2026 | direct |
| Semple Frank M | Director | 63,476 | 3,662,563 $ | Aug 14, 2026 | direct |
| Stice J Michael | Director | 58,413 | 3,370,425 $ | Aug 14, 2026 | direct |
| Breves Christine S | Director | 15,038 | 867,709 $ | Aug 14, 2026 | direct |
| Walker Ray N JR | Director | 4,609 | 265,956 $ | Aug 14, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 14, 2026 | Peiffer Garry L. | Director | Other | 1,232 | 0.00 | – |
| Aug 14, 2026 | Walker Ray N JR | Director | Other | 82 | 0.00 | – |
| Aug 14, 2026 | Surma John P | Director | Other | 1,563 | 0.00 | – |
| Aug 14, 2026 | Stice J Michael | Director | Other | 983 | 0.00 | – |
| Aug 14, 2026 | Semple Frank M | Director | Other | 1,073 | 0.00 | – |
| Aug 14, 2026 | Helms Christopher A | Director | Other | 1,337 | 0.00 | – |
| Aug 14, 2026 | Breves Christine S | Director | Other | 219 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 28, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.