ALPS ADVISORS INC
Rank #1
2.62%
- Shares
- 27.07M
- Change
- +26.64M
- Change %
- +6201.93%
- Filing
- Mar 31, 2026
Increased
Methodology published · Market data, model notes, and corrections process are public · Data policy · Corrections policy
NYSE · ENERGY · Holders
MPLX LP (MPLX) Institutional Ownership & Insider Trading History
Top MPLX institutional shareholders, filing changes, and Form 4 insider activity with filters for buys, sales, option exercises, gifts, and tax withholding.
Section freshness
Price Jun 24, 4:00 PM EDT · Statements Mar 30, 8:00 PM EDT
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Ownership read
MPLX insider sentiment: Administrative only.
ALPS ADVISORS INC is the largest institutional holder. The recent Form 4 filings are mostly awards, gifts, option exercises, conversions, or administrative transactions rather than open-market buys and sells. Use the filters below to separate real buying and selling from option exercises, gifts, awards, and tax withholding.
Insider flow
MPLX
Purchases—
Sales—
Directional bars ignore awards, gifts, conversions, and tax withholding rows.
Top holder
27.07M
ALPS ADVISORS INC
Insider stance
Administrative only
Based on recent Form 4 action codes
Latest filing
May 15, 2026
Most recent holder or insider filing date
Filings shown
180
120 holder / 60 insider
- Holder rows
- 120
- Market data source
- Latest filing
- May 15, 2026
- Most recent holder or insider filing date
- Increased / initiated
- 63
- 45 decreased
- Insider rows
- 60
- Market data source
Top 120 institutional holders
MPLX LP (MPLX) institutional ownership
Ranked by reported share count, with position changes and latest filing dates where ownership data supplies them.
INVESCO LTD.
Rank #2
1.77%
- Shares
- 18.27M
- Change
- +78.73K
- Change %
- +43.00%
- Filing
- Mar 31, 2026
Increased
BLACKSTONE INC.
Rank #3
1.49%
- Shares
- 15.35M
- Change
- -354.80K
- Change %
- -2.26%
- Filing
- Mar 31, 2026
Decreased
TORTOISE CAPITAL ADVISORS
Rank #4
1.29%
- Shares
- 13.26M
- Change
- -59.33K
- Change %
- -45.00%
- Filing
- Mar 31, 2026
Decreased
GOLDMAN SACHS GROUP INC
Rank #5
1.21%
- Shares
- 12.51M
- Change
- +40.55K
- Change %
- +33.00%
- Filing
- Mar 31, 2026
Increased
MIRAE ASSET GLOBAL ETFS HOLDINGS LTD.
Rank #6
0.71%
- Shares
- 7.32M
- Change
- +410.87K
- Change %
- +5.95%
- Filing
- Mar 31, 2026
Increased
KAYNE ANDERSON CAPITAL ADVISORS LP
Rank #7
0.66%
- Shares
- 6.83M
- Change
- -400.83K
- Change %
- -5.55%
- Filing
- Mar 31, 2026
Decreased
UBS GROUP AG
Rank #8
0.51%
- Shares
- 5.23M
- Change
- -71.23K
- Change %
- -134.00%
- Filing
- Mar 31, 2026
Decreased
CHICKASAW CAPITAL MANAGEMENT LLC
Rank #9
0.51%
- Shares
- 5.22M
- Change
- -207.22K
- Change %
- -3.82%
- Filing
- Mar 31, 2026
Decreased
ENERGY INCOME PARTNERS
Rank #10
0.50%
- Shares
- 5.16M
- Change
- -142.25K
- Change %
- -2.68%
- Filing
- Mar 31, 2026
Decreased
MORGAN STANLEY
Rank #11
0.48%
- Shares
- 4.96M
- Change
- -798.91K
- Change %
- -13.86%
- Filing
- Mar 31, 2026
Decreased
JPMORGAN CHASE & CO
Rank #12
0.40%
- Shares
- 4.13M
- Change
- +847.52K
- Change %
- +25.79%
- Filing
- Mar 31, 2026
Increased
BANK OF MONTREAL
Rank #13
0.39%
- Shares
- 4.03M
- Change
- +4.02M
- Change %
- +71257.67%
- Filing
- Mar 31, 2026
Increased
FMR LLC
Rank #14
0.33%
- Shares
- 3.36M
- Change
- +1.69M
- Change %
- +101.41%
- Filing
- Mar 31, 2026
Increased
BRAVE WARRIOR ADVISORS
Rank #15
0.32%
- Shares
- 3.25M
- Change
- -1.22M
- Change %
- -27.28%
- Filing
- Mar 31, 2026
Decreased
CIBC PRIVATE WEALTH GROUP LLC
Rank #16
0.26%
- Shares
- 2.72M
- Change
- +36.11K
- Change %
- +134.00%
- Filing
- Dec 31, 2025
Increased
CIBC BANCORP USA INC.
Rank #17
0.26%
- Shares
- 2.64M
- Change
- +2.64M
- Change %
- —
- Filing
- Mar 31, 2026
Initiated
BANK OF AMERICA CORP
Rank #18
0.25%
- Shares
- 2.57M
- Change
- -5.96M
- Change %
- -69.84%
- Filing
- Mar 31, 2026
Decreased
CLEARBRIDGE INVESTMENTS
Rank #19
0.23%
- Shares
- 2.34M
- Change
- —
- Change %
- 0.00%
- Filing
- Mar 31, 2026
Unchanged
MILLER HOWARD INVESTMENTS INC
Rank #20
0.22%
- Shares
- 2.24M
- Change
- -76.23K
- Change %
- -3.29%
- Filing
- Mar 31, 2026
Decreased
WESTWOOD HOLDINGS GROUP INC
Rank #21
0.22%
- Shares
- 2.24M
- Change
- +2.19M
- Change %
- +5211.05%
- Filing
- Mar 31, 2026
Increased
BROOKFIELD CORP
Rank #22
0.21%
- Shares
- 2.17M
- Change
- -786.01K
- Change %
- -26.56%
- Filing
- Mar 31, 2026
Decreased
FRACTAL INVESTMENTS LLC
Rank #23
0.20%
- Shares
- 2.05M
- Change
- —
- Change %
- 0.00%
- Filing
- Mar 31, 2026
Unchanged
CUSHING ASSET MANAGEMENT
Rank #24
0.18%
- Shares
- 1.86M
- Change
- -24.70K
- Change %
- -131.00%
- Filing
- Mar 31, 2026
Decreased
EAGLE GLOBAL ADVISORS LLC
Rank #25
0.18%
- Shares
- 1.81M
- Change
- -79.24K
- Change %
- -4.21%
- Filing
- Mar 31, 2026
Decreased
ING GROEP NV
Rank #26
0.17%
- Shares
- 1.77M
- Change
- -1.14M
- Change %
- -39.11%
- Filing
- Mar 31, 2026
Decreased
DUFF & PHELPS INVESTMENT MANAGEMENT CO
Rank #27
0.16%
- Shares
- 1.67M
- Change
- -163.54K
- Change %
- -8.93%
- Filing
- Mar 31, 2026
Decreased
ALPHACORE CAPITAL LLC
Rank #28
0.16%
- Shares
- 1.62M
- Change
- +8.91K
- Change %
- +56.00%
- Filing
- Mar 31, 2026
Increased
STIFEL FINANCIAL CORP
Rank #29
0.13%
- Shares
- 1.33M
- Change
- +2.33K
- Change %
- +17.00%
- Filing
- Mar 31, 2026
Increased
BNP PARIBAS FINANCIAL MARKETS
Rank #30
0.13%
- Shares
- 1.29M
- Change
- +184.41K
- Change %
- +16.67%
- Filing
- Mar 31, 2026
Increased
MARINER
Rank #31
0.11%
- Shares
- 1.15M
- Change
- -674
- Change %
- -6.00%
- Filing
- Mar 31, 2026
Decreased
ROYAL BANK OF CANADA
Rank #32
0.11%
- Shares
- 1.15M
- Change
- +360.43K
- Change %
- +45.54%
- Filing
- Mar 31, 2026
Increased
EPOCH INVESTMENT PARTNERS
Rank #33
0.11%
- Shares
- 1.13M
- Change
- -29.05K
- Change %
- -2.51%
- Filing
- Mar 31, 2026
Decreased
NEUBERGER BERMAN GROUP LLC
Rank #34
0.11%
- Shares
- 1.10M
- Change
- -24.26K
- Change %
- -2.16%
- Filing
- Mar 31, 2026
Decreased
INFRASTRUCTURE CAPITAL ADVISORS
Rank #35
0.10%
- Shares
- 1.07M
- Change
- +30.27K
- Change %
- +2.92%
- Filing
- Mar 31, 2026
Increased
PROGENY 3
Rank #36
0.10%
- Shares
- 1.02M
- Change
- -42.99K
- Change %
- -4.06%
- Filing
- Mar 31, 2026
Decreased
RAYMOND JAMES FINANCIAL INC
Rank #37
0.09%
- Shares
- 977.94K
- Change
- +22.24K
- Change %
- +2.33%
- Filing
- Mar 31, 2026
Increased
VICTORY CAPITAL MANAGEMENT INC
Rank #38
0.09%
- Shares
- 971.48K
- Change
- +906.75K
- Change %
- +1401.00%
- Filing
- Mar 31, 2026
Increased
COHEN & STEERS
Rank #39
0.09%
- Shares
- 929.75K
- Change
- +49.16K
- Change %
- +5.58%
- Filing
- Mar 31, 2026
Increased
BARCLAYS PLC
Rank #40
0.09%
- Shares
- 887.23K
- Change
- -28.46K
- Change %
- -3.11%
- Filing
- Mar 31, 2026
Decreased
DEUTSCHE BANK AG\
Rank #41
0.08%
- Shares
- 853.78K
- Change
- —
- Change %
- 0.00%
- Filing
- Mar 31, 2026
Unchanged
ALLIANZ ASSET MANAGEMENT GMBH
Rank #42
0.08%
- Shares
- 829.14K
- Change
- —
- Change %
- 0.00%
- Filing
- Mar 31, 2026
Unchanged
WELLS FARGO & COMPANY
Rank #43
0.08%
- Shares
- 805.23K
- Change
- +56.56K
- Change %
- +7.55%
- Filing
- Mar 31, 2026
Increased
AMERICANA PARTNERS
Rank #44
0.07%
- Shares
- 765.47K
- Change
- +5.16K
- Change %
- +68.00%
- Filing
- Mar 31, 2026
Increased
REAVES W H & CO INC
Rank #45
0.06%
- Shares
- 670.50K
- Change
- —
- Change %
- 0.00%
- Filing
- Mar 31, 2026
Unchanged
LONGFELLOW INVESTMENT MANAGEMENT CO LLC
Rank #46
0.06%
- Shares
- 579.45K
- Change
- -187.08K
- Change %
- -24.41%
- Filing
- Mar 31, 2026
Decreased
U.S. CAPITAL WEALTH ADVISORS
Rank #47
0.06%
- Shares
- 577.58K
- Change
- -840
- Change %
- -14.00%
- Filing
- Mar 31, 2026
Decreased
JENNISON ASSOCIATES LLC
Rank #48
0.05%
- Shares
- 545.07K
- Change
- -125.26K
- Change %
- -18.69%
- Filing
- Mar 31, 2026
Decreased
APPALOOSA LP
Rank #49
0.05%
- Shares
- 502.46K
- Change
- -125.04K
- Change %
- -19.93%
- Filing
- Mar 31, 2026
Decreased
CHICAGO PARTNERS INVESTMENT GROUP LLC
Rank #50
0.05%
- Shares
- 486.67K
- Change
- +7.06K
- Change %
- +147.00%
- Filing
- Mar 31, 2026
Increased
LPL FINANCIAL LLC
Rank #51
0.05%
- Shares
- 476.69K
- Change
- -2.21K
- Change %
- -46.00%
- Filing
- Mar 31, 2026
Decreased
OXBOW ADVISORS
Rank #52
0.04%
- Shares
- 434.01K
- Change
- +28.84K
- Change %
- +7.12%
- Filing
- Mar 31, 2026
Increased
BOLLARD GROUP LLC
Rank #53
0.04%
- Shares
- 405.73K
- Change
- +52.31K
- Change %
- +14.80%
- Filing
- Mar 31, 2026
Increased
EXCHANGE TRADED CONCEPTS
Rank #54
0.04%
- Shares
- 403.88K
- Change
- -154.86K
- Change %
- -27.72%
- Filing
- Mar 31, 2026
Decreased
SOVEREIGN INVESTMENT ADVISORS
Rank #55
0.04%
- Shares
- 373.95K
- Change
- +1.75K
- Change %
- +47.00%
- Filing
- Mar 31, 2026
Increased
HIGHTOWER ADVISORS
Rank #56
0.04%
- Shares
- 363.68K
- Change
- -3.04K
- Change %
- -83.00%
- Filing
- Mar 31, 2026
Decreased
NORTHSIDE CAPITAL MANAGEMENT
Rank #57
0.04%
- Shares
- 362.11K
- Change
- -227.97K
- Change %
- -38.63%
- Filing
- Mar 31, 2026
Decreased
GOLDENTREE ASSET MANAGEMENT LP
Rank #58
0.03%
- Shares
- 344.69K
- Change
- -80.20K
- Change %
- -18.88%
- Filing
- Mar 31, 2026
Decreased
MARYLAND STATE RETIREMENT & PENSION SYSTEM
Rank #59
0.03%
- Shares
- 339.11K
- Change
- -15.41K
- Change %
- -4.35%
- Filing
- Mar 31, 2026
Decreased
CORIENT PRIVATE WEALTH LLC
Rank #60
0.03%
- Shares
- 337.72K
- Change
- +57.62K
- Change %
- +20.57%
- Filing
- Mar 31, 2026
Increased
| # | Institution | % held | Shares | Change | Change % | Filing date |
|---|---|---|---|---|---|---|
| 1 | ALPS ADVISORS INC | 2.62% | 27.07M | +26.64M Increased | +6201.93% | Mar 31, 2026 |
| 2 | 1.77% | 18.27M | +78.73K Increased | +43.00% | Mar 31, 2026 | |
| 3 | BLACKSTONE INC. | 1.49% | 15.35M | -354.80K Decreased | -2.26% | Mar 31, 2026 |
| 4 | TORTOISE CAPITAL ADVISORS | 1.29% | 13.26M | -59.33K Decreased | -45.00% | Mar 31, 2026 |
| 5 | 1.21% | 12.51M | +40.55K Increased | +33.00% | Mar 31, 2026 | |
| 6 | MIRAE ASSET GLOBAL ETFS HOLDINGS LTD. | 0.71% | 7.32M | +410.87K Increased | +5.95% | Mar 31, 2026 |
| 7 | KAYNE ANDERSON CAPITAL ADVISORS LP | 0.66% | 6.83M | -400.83K Decreased | -5.55% | Mar 31, 2026 |
| 8 | 0.51% | 5.23M | -71.23K Decreased | -134.00% | Mar 31, 2026 | |
| 9 | CHICKASAW CAPITAL MANAGEMENT LLC | 0.51% | 5.22M | -207.22K Decreased | -3.82% | Mar 31, 2026 |
| 10 | ENERGY INCOME PARTNERS | 0.50% | 5.16M | -142.25K Decreased | -2.68% | Mar 31, 2026 |
| 11 | 0.48% | 4.96M | -798.91K Decreased | -13.86% | Mar 31, 2026 | |
| 12 | 0.40% | 4.13M | +847.52K Increased | +25.79% | Mar 31, 2026 | |
| 13 | BANK OF MONTREAL | 0.39% | 4.03M | +4.02M Increased | +71257.67% | Mar 31, 2026 |
| 14 | 0.33% | 3.36M | +1.69M Increased | +101.41% | Mar 31, 2026 | |
| 15 | BRAVE WARRIOR ADVISORS | 0.32% | 3.25M | -1.22M Decreased | -27.28% | Mar 31, 2026 |
| 16 | CIBC PRIVATE WEALTH GROUP LLC | 0.26% | 2.72M | +36.11K Increased | +134.00% | Dec 31, 2025 |
| 17 | CIBC BANCORP USA INC. | 0.26% | 2.64M | +2.64M Initiated | — | Mar 31, 2026 |
| 18 | 0.25% | 2.57M | -5.96M Decreased | -69.84% | Mar 31, 2026 | |
| 19 | CLEARBRIDGE INVESTMENTS | 0.23% | 2.34M | — Unchanged | 0.00% | Mar 31, 2026 |
| 20 | MILLER HOWARD INVESTMENTS INC | 0.22% | 2.24M | -76.23K Decreased | -3.29% | Mar 31, 2026 |
| 21 | WESTWOOD HOLDINGS GROUP INC | 0.22% | 2.24M | +2.19M Increased | +5211.05% | Mar 31, 2026 |
| 22 | BROOKFIELD CORP | 0.21% | 2.17M | -786.01K Decreased | -26.56% | Mar 31, 2026 |
| 23 | FRACTAL INVESTMENTS LLC | 0.20% | 2.05M | — Unchanged | 0.00% | Mar 31, 2026 |
| 24 | CUSHING ASSET MANAGEMENT | 0.18% | 1.86M | -24.70K Decreased | -131.00% | Mar 31, 2026 |
| 25 | EAGLE GLOBAL ADVISORS LLC | 0.18% | 1.81M | -79.24K Decreased | -4.21% | Mar 31, 2026 |
| 26 | ING GROEP NV | 0.17% | 1.77M | -1.14M Decreased | -39.11% | Mar 31, 2026 |
| 27 | DUFF & PHELPS INVESTMENT MANAGEMENT CO | 0.16% | 1.67M | -163.54K Decreased | -8.93% | Mar 31, 2026 |
| 28 | ALPHACORE CAPITAL LLC | 0.16% | 1.62M | +8.91K Increased | +56.00% | Mar 31, 2026 |
| 29 | STIFEL FINANCIAL CORP | 0.13% | 1.33M | +2.33K Increased | +17.00% | Mar 31, 2026 |
| 30 | BNP PARIBAS FINANCIAL MARKETS | 0.13% | 1.29M | +184.41K Increased | +16.67% | Mar 31, 2026 |
| 31 | MARINER | 0.11% | 1.15M | -674 Decreased | -6.00% | Mar 31, 2026 |
| 32 | ROYAL BANK OF CANADA | 0.11% | 1.15M | +360.43K Increased | +45.54% | Mar 31, 2026 |
| 33 | EPOCH INVESTMENT PARTNERS | 0.11% | 1.13M | -29.05K Decreased | -2.51% | Mar 31, 2026 |
| 34 | NEUBERGER BERMAN GROUP LLC | 0.11% | 1.10M | -24.26K Decreased | -2.16% | Mar 31, 2026 |
| 35 | INFRASTRUCTURE CAPITAL ADVISORS | 0.10% | 1.07M | +30.27K Increased | +2.92% | Mar 31, 2026 |
| 36 | PROGENY 3 | 0.10% | 1.02M | -42.99K Decreased | -4.06% | Mar 31, 2026 |
| 37 | RAYMOND JAMES FINANCIAL INC | 0.09% | 977.94K | +22.24K Increased | +2.33% | Mar 31, 2026 |
| 38 | VICTORY CAPITAL MANAGEMENT INC | 0.09% | 971.48K | +906.75K Increased | +1401.00% | Mar 31, 2026 |
| 39 | COHEN & STEERS | 0.09% | 929.75K | +49.16K Increased | +5.58% | Mar 31, 2026 |
| 40 | BARCLAYS PLC | 0.09% | 887.23K | -28.46K Decreased | -3.11% | Mar 31, 2026 |
| 41 | DEUTSCHE BANK AG\ | 0.08% | 853.78K | — Unchanged | 0.00% | Mar 31, 2026 |
| 42 | ALLIANZ ASSET MANAGEMENT GMBH | 0.08% | 829.14K | — Unchanged | 0.00% | Mar 31, 2026 |
| 43 | WELLS FARGO & COMPANY | 0.08% | 805.23K | +56.56K Increased | +7.55% | Mar 31, 2026 |
| 44 | AMERICANA PARTNERS | 0.07% | 765.47K | +5.16K Increased | +68.00% | Mar 31, 2026 |
| 45 | REAVES W H & CO INC | 0.06% | 670.50K | — Unchanged | 0.00% | Mar 31, 2026 |
| 46 | LONGFELLOW INVESTMENT MANAGEMENT CO LLC | 0.06% | 579.45K | -187.08K Decreased | -24.41% | Mar 31, 2026 |
| 47 | U.S. CAPITAL WEALTH ADVISORS | 0.06% | 577.58K | -840 Decreased | -14.00% | Mar 31, 2026 |
| 48 | 0.05% | 545.07K | -125.26K Decreased | -18.69% | Mar 31, 2026 | |
| 49 | APPALOOSA LP | 0.05% | 502.46K | -125.04K Decreased | -19.93% | Mar 31, 2026 |
| 50 | CHICAGO PARTNERS INVESTMENT GROUP LLC | 0.05% | 486.67K | +7.06K Increased | +147.00% | Mar 31, 2026 |
| 51 | LPL FINANCIAL LLC | 0.05% | 476.69K | -2.21K Decreased | -46.00% | Mar 31, 2026 |
| 52 | OXBOW ADVISORS | 0.04% | 434.01K | +28.84K Increased | +7.12% | Mar 31, 2026 |
| 53 | BOLLARD GROUP LLC | 0.04% | 405.73K | +52.31K Increased | +14.80% | Mar 31, 2026 |
| 54 | EXCHANGE TRADED CONCEPTS | 0.04% | 403.88K | -154.86K Decreased | -27.72% | Mar 31, 2026 |
| 55 | SOVEREIGN INVESTMENT ADVISORS | 0.04% | 373.95K | +1.75K Increased | +47.00% | Mar 31, 2026 |
| 56 | HIGHTOWER ADVISORS | 0.04% | 363.68K | -3.04K Decreased | -83.00% | Mar 31, 2026 |
| 57 | NORTHSIDE CAPITAL MANAGEMENT | 0.04% | 362.11K | -227.97K Decreased | -38.63% | Mar 31, 2026 |
| 58 | GOLDENTREE ASSET MANAGEMENT LP | 0.03% | 344.69K | -80.20K Decreased | -18.88% | Mar 31, 2026 |
| 59 | MARYLAND STATE RETIREMENT & PENSION SYSTEM | 0.03% | 339.11K | -15.41K Decreased | -4.35% | Mar 31, 2026 |
| 60 | CORIENT PRIVATE WEALTH LLC | 0.03% | 337.72K | +57.62K Increased | +20.57% | Mar 31, 2026 |
Showing 60 of 120 matching institutional rows.Load more institutions
Recent insider transactions
MPLX LP (MPLX) Form 4 filings
Action codes are translated so open-market buys and sales are separate from awards, gifts, conversions, and tax withholding.
Breves Christine S
- Shares
- 14.36K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
Peiffer Garry L.
- Shares
- 67.62K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
STICE J MICHAEL
- Shares
- 56.97K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
Walker Ray N JR
- Shares
- 4.07K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
SEMPLE FRANK M
- Shares
- 61.95K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
SURMA JOHN P
- Shares
- 93.43K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
HELMS CHRISTOPHER A
- Shares
- 84.41K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
Breves Christine S
- Shares
- 14.08K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed Apr 30, 2026
Peiffer Garry L.
- Shares
- 66.32K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed Apr 30, 2026
STICE J MICHAEL
- Shares
- 55.88K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed Apr 30, 2026
Walker Ray N JR
- Shares
- 3.99K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed Apr 30, 2026
SEMPLE FRANK M
- Shares
- 60.75K
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed Apr 30, 2026
| # | Insider | % company | Action | Shares | Price | Value | Filing date |
|---|---|---|---|---|---|---|---|
| 1 | Breves Christine S | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 14.36K | No cash value | No cash value | May 15, 2026 |
| 2 | Peiffer Garry L. | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 67.62K | No cash value | No cash value | May 15, 2026 |
| 3 | STICE J MICHAEL | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 56.97K | No cash value | No cash value | May 15, 2026 |
| 4 | Walker Ray N JR | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 4.07K | No cash value | No cash value | May 15, 2026 |
| 5 | SEMPLE FRANK M | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 61.95K | No cash value | No cash value | May 15, 2026 |
| 6 | SURMA JOHN P | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 93.43K | No cash value | No cash value | May 15, 2026 |
| 7 | HELMS CHRISTOPHER A | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 84.41K | No cash value | No cash value | May 15, 2026 |
| 8 | Breves Christine S | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 14.08K | No cash value | No cash value | Apr 30, 2026 |
| 9 | Peiffer Garry L. | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 66.32K | No cash value | No cash value | Apr 30, 2026 |
| 10 | STICE J MICHAEL | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 55.88K | No cash value | No cash value | Apr 30, 2026 |
| 11 | Walker Ray N JR | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 3.99K | No cash value | No cash value | Apr 30, 2026 |
| 12 | SEMPLE FRANK M | <0.01% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 60.75K | No cash value | No cash value | Apr 30, 2026 |
Showing 12 of 60 matching Form 4 rows. Percent of company uses current shares outstanding when available.Load more insiders
Frequently asked
Common questions.
Who are the largest MPLX shareholders?
ALPS ADVISORS INC is the largest institutional holder of MPLX, with 27.07 million shares, or about 2.62% of shares outstanding. Additional institutions are ranked by reported share count.
What is institutional ownership of MPLX?
MPLX LP (MPLX) has 120 institutional holders on file — 63 that increased or initiated positions and 45 that reduced them, as of the latest filing on Mar 31, 2026.
Where can I see MPLX LP insider transactions?
MPLX LP (MPLX) has 60 Form 4 insider transactions on file, most recently on May 15, 2026, separated into purchases, sales, option exercises, awards, gifts, and tax withholding so administrative transactions are distinguished from open-market trades.
Are MPLX insiders buying or selling?
Recent MPLX insider activity reads Administrative only: 0 sales and 0 purchases. Awards, gifts, conversions, and tax withholding are listed separately because they do not carry the same signal as open-market trades.
Who is the most active MPLX insider?
Mannen Maryann T. is the most active MPLX insider by absolute share movement, with 691,278 shares moving across the filing history. Review the action labels before treating that activity as buying or selling.