Question 1

Who owns MPLXP stock?

Accepted Answer

MPLXP (MPLX LP) is held by 3 tracked superinvestors with an aggregate position value of $209M based on the most recent SEC 13F filings. Top institutional holders include: Glenn Greenberg, David Tepper, Wally Obermeyer.

Question 2

How much MPLXP do superinvestors hold in aggregate?

Accepted Answer

Across 3 tracked managers, superinvestors collectively report $209M in MPLXP positions worth 3,715,340 shares.

Question 3

What is the largest holder of MPLXP?

Accepted Answer

The largest tracked holder of MPLXP is Glenn Greenberg (Brave Warrior Advisors) with 3,180,534 shares worth $179M, representing 3.90% of their portfolio.

Investor	Fund	Shares	Value▼	% of Portfolio	Rpt Price	Period
Glenn Greenberg	Brave Warrior Advisors	3180534	$179.2M	3.90%	$56.33	Q2 2026
David Tepper	Appaloosa Management	502460	$28.3M	0.37%	$56.33	Q2 2026
Wally Obermeyer	Obermeyer Wealth Partners	32346	$1.8M	0.07%	$56.33	Q2 2026

MPLXPMPLX LP

📊 Holdings Over Time

Quarter-by-Quarter Activity