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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Price time means the latest available trade or regular-market close. Other times show when that section was checked or published.
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Latest item •
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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
| # | 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 |
Showing 20 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.