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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

Prices as of Oct 2, 4:00 PM EDT · Fundamentals checked Oct 3, 4:17 PM EDT

Ownership read

MPLX insider transaction activity: Mixed activity.

Alps Advisors Inc. is the largest institutional holder. 1 sale and 1 purchase appear in the recent Form 4 filings. Use the filters below to separate open-market activity from option exercises, gifts, awards, and tax withholding.

Review insider tradesView institutions

Insider flow

MPLX

Purchases4.00K
Sales4.00K

Directional bars ignore awards, gifts, conversions, and tax withholding rows.

Top holder

28.60M

Alps Advisors Inc.

Insider transaction activity

Mixed activity

$188.96K sold / $211K bought

Observations shown

109

10 holder / 99 insider

Holder rows
10
Yahoo Finance · Filing dates shown per row
Increased / initiated
6
4 decreased · provider-reported changes
Insider rows
99
Yahoo Finance · Filing dates shown per row

Ownership concentration and transaction activity

Top 10 reported holders
11.00% outstanding
Changes with share-count history
Prior-position data unavailable
New / exited positions
0 / 0 explicitly reported
Largest increase with share-count history
Prior share counts unavailable

Reported-holder cohort only; absence from a limited provider list does not establish an exit. Changes are provider-reported and are only comparable quarter over quarter when the position periods match.

Net shares sold: 0

Sale-code S shares minus purchase-code P shares in this sample. Includes disclosed plans and unknown plan status; excludes grants, gifts, exercises and withholding. This is activity, not sentiment.

  • Grant: 97
  • Purchase / sale; plan unknown: 2

Top 10 institutional holders

MPLX LP (MPLX) institutional ownership

Ranked by reported share count, with position changes and separate position and filing dates where ownership data supplies them.

MPLX LP (MPLX) institutional ownership
#Institution% heldSharesChange %Position / filing date
1
Alps Advisors Inc.
2.82%28.60M+5.65%Position as of Jun 30, 2026Filing date unknown
2
Invesco Ltd.
1.80%18.27M+0.04%Position as of Jun 30, 2026Filing date unknown
3
Blackstone Inc
1.28%12.96M-15.59%Position as of Jun 30, 2026Filing date unknown
4
Goldman Sachs Group Inc
1.12%11.33M-9.42%Position as of Jun 30, 2026Filing date unknown
5
Tortoise Capital Advisors, LLC
1.04%10.50M-20.81%Position as of Jun 30, 2026Filing date unknown
6
Mirae Asset Global ETFs Holdings Ltd.
0.79%8.01M+9.46%Position as of Jun 30, 2026Filing date unknown
7
Kayne Anderson Capital Advisors, L.P.
0.58%5.86M-14.12%Position as of Jun 30, 2026Filing date unknown
8
Energy Income Partners, LLC
0.53%5.38M+4.32%Position as of Jun 30, 2026Filing date unknown
9
Morgan Stanley
0.52%5.28M+6.28%Position as of Jun 30, 2026Filing date unknown
10
UBS Group AG
0.52%5.26M+0.49%Position as of Jun 30, 2026Filing date unknown
Showing 10 of 10 matching institutional rows.

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.

MPLX LP (MPLX) Form 4 insider transactions
#Insider% companyActionSharesTransaction date
1
BREVES CHRISTINE S
Director
<0.01%Stock Award(Grant)Provider-supplied Form 4 action code. Review the original filing before making a trading judgment.
Transaction context
Classification:
Grant
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

218Aug 14, 2026
2
STICE J MICHAEL ED.D.
Director
<0.01%Stock Award(Grant)Provider-supplied Form 4 action code. Review the original filing before making a trading judgment.
Transaction context
Classification:
Grant
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

982Aug 14, 2026
3
SURMA JOHN P JR.
Director
<0.01%Stock Award(Grant)Provider-supplied Form 4 action code. Review the original filing before making a trading judgment.
Transaction context
Classification:
Grant
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

1.56KAug 14, 2026
4
WALKER RAY N JR
Director
<0.01%Stock Award(Grant)Provider-supplied Form 4 action code. Review the original filing before making a trading judgment.
Transaction context
Classification:
Grant
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

81Aug 14, 2026
5
PEIFFER GARRY L
Director
<0.01%Stock Award(Grant)Provider-supplied Form 4 action code. Review the original filing before making a trading judgment.
Transaction context
Classification:
Grant
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

1.23KAug 14, 2026
6
HELMS CHRISTOPHER A
Affiliated Person
<0.01%Stock Award(Grant)Provider-supplied Form 4 action code. Review the original filing before making a trading judgment.
Transaction context
Classification:
Grant
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

1.34KAug 14, 2026
7
SEMPLE FRANK M
Director
<0.01%Stock Award(Grant)Provider-supplied Form 4 action code. Review the original filing before making a trading judgment.
Transaction context
Classification:
Grant
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

1.07KAug 14, 2026
8
BREVES CHRISTINE S
Affiliated Person
<0.01%Stock Award(Grant)Provider-supplied Form 4 action code. Review the original filing before making a trading judgment.
Transaction context
Classification:
Grant
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

276May 15, 2026
9
STICE J MICHAEL ED.D.
Director
<0.01%Stock Award(Grant)Provider-supplied Form 4 action code. Review the original filing before making a trading judgment.
Transaction context
Classification:
Grant
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

1.10KMay 15, 2026
10
SURMA JOHN P JR.
Affiliated Person
<0.01%Stock Award(Grant)Provider-supplied Form 4 action code. Review the original filing before making a trading judgment.
Transaction context
Classification:
Grant
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

1.66KMay 15, 2026
11
WALKER RAY N JR
Director
<0.01%Stock Award(Grant)Provider-supplied Form 4 action code. Review the original filing before making a trading judgment.
Transaction context
Classification:
Grant
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

78May 15, 2026
12
PEIFFER GARRY L
Director
<0.01%Stock Award(Grant)Provider-supplied Form 4 action code. Review the original filing before making a trading judgment.
Transaction context
Classification:
Grant
10b5-1:
Unknown; not supplied by provider
Holdings after:
Not reported
Position sold:
Not calculable
Filed:
Not reported

Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.

1.30KMay 15, 2026
Showing 12 of 99 matching Form 4 rows. Percent of company uses current shares outstanding.

Frequently asked

Common questions.

Who are the largest MPLX shareholders?

Alps Advisors Inc. is the largest reported institutional holder of MPLX, with 28.60 million shares, or about 2.82% of shares outstanding.

What does the institutional filing activity show for MPLX?

MPLX LP has 10 institutional rows on file: 6 increased or initiated positions and 4 reduced them.

What insider transactions are available for MPLX?

TECHi shows 99 dated MPLX insider transactions through Aug 14, 2026, with transaction types kept separate so administrative actions are not presented as open-market trades.

Are MPLX insiders buying or selling?

The displayed MPLX activity reads Mixed activity: 1 sale and 1 purchase. Other transaction types remain separate.

Who is the most active reported MPLX insider?

MANNEN MARYANN T has the largest absolute share movement in the displayed MPLX filing rows, totaling 101,680 shares. The action labels provide the transaction context.

All data sources

Search the dated figures used for this view. Each entry identifies its units, reporting period and calculation status.

How to use this page

Use this to check who owns the float and whether insiders are active.

Best for Institutional concentration, insider transaction pattern, and float context.

Weak when Filings are delayed or transactions are administrative rather than economic.

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