MPLX

MPLX • NYSE

MPLX is a oil & gas midstream company in the energy sector on NYSE, led by Maryann T. Mannen, with a market cap of $55.5B. As of Q3 2025, 21% of shares are held by 568 institutional investors, with ALPS ADVISORS INC as the largest holder at 2.59%.

Chief Executive OfficerMaryann T. Mannen

Market Cap$55.5B

Oil & Gas Midstream

Energy

Employees5.8K

Websitemplx.com

Country

United States of America

Overview

Overview of institutional ownership in MPLX as of Q3 2025 with a market cap of $50.9B

All Institutions

Institutions: 568
Value Held: $10.5B
Shares Held: 209.9M
Avg Position: $18.5M
Median Position: $580.3K

Hedge Funds

Hedge Funds: 24
Value Held: $428.4M
Shares Held: 8.6M
Avg Position: $17.9M
Median Position: $1.2M

Ownership Breakdown

Institutional (non-HF)

19.76%

$10.1B

Hedge Funds

0.842%

$428.4M

Retail & Other

79.4%

$40.4B

Based on market cap of $50.9B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in MPLX as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
A ALPS ADVISORS INC ETF Provider	Laton Andrew Spahr President	$1.3B 7.35% of portfolio	2.59% 26.4M shares	Q2 2015 Held for 10y 5m	$18.0B
Invesco Ltd. ETF Provider	Brian Christopher Hartigan CEO	$977.1M 0.15% of portfolio	1.92% 19.6M shares	Q3 2014 Held for 11y 2m	$633.08B
Blackstone Group L.P. Institution	Jonathan D. Gray President	$700.2M 3.02% of portfolio	1.38% 14.0M shares	Q1 2020 Held for 5y 8m	$23.2B
TORTOISE CAPITAL ADVISORS, L.L.C. Real Assets	Thomas Ibberson Florence CEO	$675.3M 8.71% of portfolio	1.33% 13.5M shares	≤ Q2 2013 Held for 12y 5m+	$7.8B
GOLDMAN SACHS GROUP INC Institution	David M. Solomon CEO	$654.2M 0.09% of portfolio	1.29% 13.1M shares	≤ Q2 2013 Held for 12y 5m+	$691.34B
BANK OF AMERICA CORP /DE/ Institution	Brian T. Moynihan CEO	$466.8M 0.04% of portfolio	0.92% 9.3M shares	≤ Q2 2013 Held for 12y 5m+	$1.33T
KAYNE ANDERSON CAPITAL ADVISORS LP Private Equity	Albert Rabil CEO	$361.3M 8.02% of portfolio	0.71% 7.2M shares	Q4 2014 Held for 10y 11m	$4.5B
M MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Institution	-	$352.6M 0.57% of portfolio	0.69% 7.1M shares	Q2 2024 Held for 1y 5m	$61.8B
Energy Income Partners, LLC Long Only Manager	James Jarvis Murchie CEO	$282.7M 5.45% of portfolio	0.56% 5.7M shares	Q4 2021 Held for 3y 11m	$5.2B
CHICKASAW CAPITAL MANAGEMENT LLC Long Only Manager	Geoffrey Paul Mavar Managing Partner	$280.3M 11.56% of portfolio	0.55% 5.6M shares	≤ Q2 2013 Held for 12y 5m+	$2.4B

Net Capital Flow

Institutional buying and selling activity for MPLX in Q3 2025

Traded: −$1.1B
Buyers: 273
Sellers: 166
Total Bought: +$266.2M
Total Sold: −$1.4B
Avg Position: $17.1M

Biggest Buyers

Institution	Net Bought	Current Position
N NATIXIS Institution	+$28.5M +570.0K shares	$48.6M 973.8K shares
TORTOISE CAPITAL ADVISORS, L.L.C. Real Assets	+$16.5M +329.6K shares	$675.3M 13.5M shares
A ALPS ADVISORS INC ETF Provider	+$16.3M +325.5K shares	$1.3B 26.4M shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	+$15.2M +304.1K shares	$17.0M 340.2K shares
M MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Institution	+$15.0M +300.3K shares	$352.6M 7.1M shares
FMR LLC Institution	+$12.1M +242.0K shares	$83.2M 1.7M shares
C CI Private Wealth, LLC RIA/Wealth	+$11.8M +242.3K shares	$13.8M 281.3K shares
B Brave Warrior Advisors, LLC Hedge Fund•Long/Short	+$9.6M +192.4K shares	$223.2M 4.5M shares
Blueprint Financial Advisors LLC RIA/Wealth	+$7.9M +157.9K shares	$7.9M 157.9K shares
Invesco Ltd. ETF Provider	+$7.2M +143.4K shares	$977.1M 19.6M shares

Biggest Sellers

Institution	Net Sold	Current Position
Kingstone Capital Partners Texas, LLC RIA/Wealth	−$776.9M −15.1M shares	Sold Off 0 shares
Blackstone Group L.P. Institution	−$146.1M −2.9M shares	$700.2M 14.0M shares
UBS Group AG Institution	−$77.1M −1.5M shares	$263.1M 5.3M shares
VICTORY CAPITAL MANAGEMENT INC Long Only Manager	−$60.0M −1.2M shares	$12.2M 244.6K shares
GOLDMAN SACHS GROUP INC Institution	−$52.4M −1.0M shares	$654.2M 13.1M shares
B BROOKFIELD ASSET MANAGEMENT INC. RIA/Wealth	−$46.5M −931.6K shares	$141.1M 2.8M shares
MORGAN STANLEY RIA/Wealth	−$29.3M −586.0K shares	$232.7M 4.7M shares
BANK OF AMERICA CORP /DE/ Institution	−$26.4M −527.7K shares	$466.8M 9.3M shares
KAYNE ANDERSON CAPITAL ADVISORS LP Private Equity	−$19.2M −385.3K shares	$361.3M 7.2M shares
I ING GROEP NV Institution	−$12.9M −258.2K shares	$215.0M 4.3M shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited MPLX in Q3 2025

New Positions: 28
New Value: $14.5M
Exited Positions: 45
Exited Value: $804.9M

New Positions

Institution	Position Value
Blueprint Financial Advisors LLC RIA/Wealth	$7.9M 157.9K shares
F FIRST INTERSTATE BANK Institution	$799.2K 16.0K shares
Bouchey Financial Group Ltd RIA/Wealth	$527.9K 10.6K shares
S Sunbeam Capital Management, LLC RIA/Wealth	$515.0K 10.3K shares
PINNACLE FINANCIAL PARTNERS INC Institution	$449.6K 9.0K shares
Traynor Capital Management, Inc. RIA/Wealth	$393.3K 7.9K shares
Vestmark Advisory Solutions, Inc. Fund of Funds	$363.6K 7.3K shares
Severin Investments, LLC RIA/Wealth	$346.2K 6.9K shares
Cannon Advisors, Inc. RIA/Wealth	$333.5K 6.6K shares
FIDUCIARY FINANCIAL GROUP, LLC RIA/Wealth	$330.6K 6.6K shares

Exited Positions

Institution	Previous Position
Kingstone Capital Partners Texas, LLC RIA/Wealth	$776.9M 15.1M shares
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$11.1M 216.4K shares
Corigliano Investment Advisers, LLC Hedge Fund•Sector	$3.9M 75.0K shares
Counterpoint Mutual Funds LLC ETF Provider	$1.9M 36.8K shares
CUSTOM INDEX SYSTEMS, LLC RIA/Wealth	$984.7K 19.1K shares
V Virtu Financial LLC Institution	$962.2K 18.7K shares
GEODE CAPITAL MANAGEMENT LLC ETF Provider	$852.9K 16.6K shares
MCDONALD PARTNERS LLC RIA/Wealth	$837.0K 16.2K shares
Morningstar Investment Management LLC Long Only Manager	$752.6K 14.6K shares
FRANKLIN RESOURCES INC Institution	$665.5K 12.9K shares

Options Activity

Institutions with the largest Call and Put options positions in MPLX as of Q3 2025

Call Positions: 7
Call Value: $90.4M
Put Positions: 10
Put Value: $81.4M

Call Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$34.5M 6.9K contracts
J JANE STREET GROUP, LLC Institution	$24.1M 4.8K contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$23.6M 4.7K contracts
W WOLVERINE TRADING, LLC Institution	$6.5M 1.3K contracts
P PEAK6 LLC Institution	$1.4M 283.0 contracts
S Squarepoint Ops LLC Hedge Fund•Quant	$304.7K 61.0 contracts
NBC SECURITIES, INC. RIA/Wealth	$260.0 0.0 contracts

Put Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$46.7M 9.4K contracts
J JANE STREET GROUP, LLC Institution	$13.6M 2.7K contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$12.4M 2.5K contracts
W WOLVERINE TRADING, LLC Institution	$6.2M 1.2K contracts
S Squarepoint Ops LLC Hedge Fund•Quant	$1.5M 301.0 contracts
VELA Investment Management, LLC Long Only Manager	$954.0K 191.0 contracts
SIGNATUREFD, LLC RIA/Wealth	$9.5K 50.0 contracts
GREEN SQUARE CAPITAL MANAGEMENT LLC RIA/Wealth	- - contracts
P PEAK6 LLC Institution	- - contracts
WELLS FARGO & COMPANY/MN Institution	- - contracts

Most Committed Institutions

Institutions with MPLX as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
PPM AMERICA INC/IL Insurance Manager	Craig Donald Smith CEO	23.42% $4.4M	0.01% 87.2K shares	Q3 2021 Held for 4y 2m	$18.6M
Fractal Investments LLC Long Only Manager	Michael Francis Farrell Managing Partner	14.79% $102.5M	0.20% 2.1M shares	Q4 2021 Held for 3y 11m	$693.0M
CHICKASAW CAPITAL MANAGEMENT LLC Long Only Manager	Geoffrey Paul Mavar Managing Partner	11.56% $280.3M	0.55% 5.6M shares	≤ Q2 2013 Held for 12y 5m+	$2.4B
INFRASTRUCTURE CAPITAL ADVISORS, LLC ETF Provider	Jay Don Hatfield CEO	10.30% $57.8M	0.11% 1.1M shares	Q4 2016 Held for 8y 11m	$561.1M
H Heronetta Management, L.P. Hedge Fund•Sector	Henry Reynolds Breck Managing Partner	9.51% $17.8M	0.03% 356.1K shares	Q4 2012 Held for 12y 11m	$187.0M
LONGFELLOW INVESTMENT MANAGEMENT CO LLC Long Only Manager	Barbara Jeanne Mckenna President	9.08% $38.3M	0.08% 766.5K shares	Q4 2020 Held for 4y 11m	$421.7M
TORTOISE CAPITAL ADVISORS, L.L.C. Real Assets	Thomas Ibberson Florence CEO	8.71% $675.3M	1.33% 13.5M shares	≤ Q2 2013 Held for 12y 5m+	$7.8B
KAYNE ANDERSON CAPITAL ADVISORS LP Private Equity	Albert Rabil CEO	8.02% $361.3M	0.71% 7.2M shares	Q4 2014 Held for 10y 11m	$4.5B
Amplify Investments, LLC ETF Provider	William Belden President	7.83% $301.4K	0.00% 6.0K shares	Q2 2025 Held for 5 months	$3.9M
W WALNUT PRIVATE EQUITY PARTNERS, LLC RIA/Wealth	Steven William Seline CEO	7.82% $12.9M	0.03% 257.5K shares	Q4 2015 Held for 9y 11m	$164.4M