MPLX Lp
MPLX Lp (MPLX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MPLX · as of Sep 30, 2025
Ownership Breakdown
590
Institutional Holders
▼ 5 vs Q2
$10.63B
Total Inst. Value
▼ $540.68M vs Q2
1.01B
Shares Outstanding
freeFloat 36.04%
212.76M
13F Shares Held
▼ 19.48M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MPLX largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
ALPS ADVISORS INC pipe lines (no natural gas) | 26.41M | 2.59% | 2.59% | $1.32T | Nov 5, 2025 | ▲ 325.5K |
INVESCO LTD. pipe lines (no natural gas) | 19.56M | 1.92% | 1.92% | $977.12B | Nov 13, 2025 | ▲ 143.4K |
BLACKSTONE INC. pipe lines (no natural gas) | 14.02M | 1.37% | 1.37% | $700.18B | Nov 14, 2025 | ▼ 2.93M |
TORTOISE CAPITAL ADVISORS, L.L.C. pipe lines (no natural gas) | 13.52M | 1.33% | 1.33% | $675.35B | Nov 13, 2025 | ▲ 329.6K |
GOLDMAN SACHS GROUP INC pipe lines (no natural gas) | 13.10M | 1.28% | 1.28% | $654.16B | Nov 14, 2025 | ▼ 1.05M |
BANK OF AMERICA CORP /DE/ pipe lines (no natural gas) | 9.35M | 91.63% | 91.63% | $466.83B | Feb 3, 2026 | ▼ 527.7K |
KAYNE ANDERSON CAPITAL ADVISORS LP pipe lines (no natural gas) | 7.23M | 70.92% | 70.92% | $361.33B | Nov 10, 2025 | ▼ 385.3K |
MIRAE ASSET GLOBAL ETFS HOLDINGS LTD. pipe lines (no natural gas) | 7.06M | 69.22% | 69.22% | $352.65B | Nov 14, 2025 | ▲ 300.3K |
ENERGY INCOME PARTNERS, LLC pipe lines (no natural gas) | 5.66M | 55.49% | 55.49% | $282.71B | Nov 13, 2025 | ▲ 118.1K |
CHICKASAW CAPITAL MANAGEMENT LLC pipe lines (no natural gas) | 5.61M | 55.02% | 55.02% | $280.31B | Oct 7, 2025 | ▲ 120.2K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
24
Increased
+3.41M shares1
New Positions
first time holders21
Decreased
−9.35M shares0
Sold Out
fully exitedNet shares change (top 50)
5.95M
+3.41M / −9.35M
Net new holders
+4
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MPLX insider trading · insider activity
Source: SEC Form 4
0
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Walker Ray N JR director | May 15, 2026 | Award | 78.436 | — | — | 4.1K | Form 4 ↗ |
SURMA JOHN P director | May 15, 2026 | Award | 1,656.317 | — | — | 93.4K | Form 4 ↗ |
STICE J MICHAEL director | May 15, 2026 | Award | 1,098.213 | — | — | 57.0K | Form 4 ↗ |
SEMPLE FRANK M director | May 15, 2026 | Award | 1,194.074 | — | — | 61.9K | Form 4 ↗ |
Peiffer Garry L. director | May 15, 2026 | Award | 1,303.501 | — | — | 67.6K | Form 4 ↗ |
HELMS CHRISTOPHER A director | May 15, 2026 | Award | 1,415.117 | — | — | 84.4K | Form 4 ↗ |
Breves Christine S director | May 15, 2026 | Award | 276.829 | — | — | 14.4K | Form 4 ↗ |
Walker Ray N JR director | Apr 30, 2026 | Award | 2,246.989 | — | — | 4.0K | Form 4 ↗ |
SURMA JOHN P director | Apr 30, 2026 | Award | 2,579.543 | — | — | 91.8K | Form 4 ↗ |
STICE J MICHAEL director | Apr 30, 2026 | Award | 2,579.543 | — | — | 55.9K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
MPLX Lp (MPLX) is primarily owned by institutional investors, who hold approximately 21.0% of total shares outstanding. Company insiders own approximately 63.96%, while retail and public investors account for the remaining 15.08%.
The largest institutional shareholder of MPLX Lp is ALPS ADVISORS INC, holding approximately 26.41 million shares — equal to 2.59% of outstanding shares — as of September 30, 2025.
A total of 590 institutional investors currently hold MPLX stock, with a combined institutional value of approximately $10.63 billion as of the most recent 13F filing period.
Frequently asked questions
MPLX ownershipMPLX Lp (MPLX) is primarily owned by institutional investors, who hold approximately 21.0% of shares. The largest shareholder is ALPS ADVISORS INC with a 2.59% stake. Company insiders hold 63.96%. Data sourced from SEC Form 13F as of September 30, 2025.