InvestorLens

MPLX — MPLX LP

Public company

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For educational research only.InvestorLens analyzes public regulatory filings (SEC EDGAR, STOCK Act PTRs) that may be delayed by 45 days or more. Information shown is historical and is not financial, legal, or tax advice, nor a recommendation or solicitation to buy or sell any security. Always do your own research.

InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.

Sourced from SEC EDGAR public filings

Why are billionaires buying MPLX?

Built from public SEC filings and public economic data. Not a recommendation.

Confidence
65
Institutional Conviction
Net distribution · 0 buying vs 0 selling last quarter
32
Macro Tailwind
Macro conditions are mixed for this sector
56
Why? — Evidence & Confidence ▾

No tracked investor changed their MPLX position last quarter. Macro conditions are mixed for this sector (Macro Tailwind 56/100 in a Overheat regime).

Supporting evidence
  • +2 tracked investors reported holding MPLX at their latest filing
  • +Macro Health is 56/100 in a Overheat regime — historically acceptable for this sectorsource
Contradicting evidence — always shown
  • −13F data is disclosed up to 45 days after quarter end — positions may have changed since
Know the limits
  • · 13F disclosure lag (up to 45 days)
  • · Tracked investors are a sample, not the whole market
  • · Sector regime fit is a historical average, not a guarantee

Every InvestorLens score shows its evidence — including what argues against it. Model conviction-v1 · generated 9/18/2026.

About MPLX LP (MPLX)

MPLX LP (MPLX) appears in the most recent 13F filings of 2 tracked institutional investors. The largest disclosed position is held by Ken Griffin (Citadel Advisors), valued at $97M. Across recent filings, tracked investors recorded 1 new positions, 2 increased, 4 reduced, and 0 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in MPLX

43
/100
Mixed Activity
Added / Increased3
Reduced4
Exited0
BearishBullish
Crowded Trade Score™

How many top investors track MPLX

13
/100
Undiscovered
2investors

Only 2 tracked investors report this position.

UndiscoveredCrowded
151015+

MPLX Ownership Composition

How MPLX LP is held across tracked investor types, based on reported 13F positions.

Dominant Type
Multi-Strategy / Quant
63% of tracked value
Institutions
2
tracked investors
Total Reported
$76.2M
combined 13F value
Types2
  • Multi-Strategy / Quant62.8%
  • Value & Distressed37.2%
Multi-Strategy / Quant(1)
62.8%
Value & Distressed(1)
37.2%

Tracked investors currently reporting MPLX

  • Ken GriffinJun 30, 2026
    Citadel Advisors
    Shares
    849.6K
    Value
    $47.9M
    % Portfolio
    0.01%
  • David TepperJun 30, 2026
    Appaloosa Management
    Shares
    502.5K
    Value
    $28.3M
    % Portfolio
    0.37%

Recent activity

Frequently asked questions

How many institutional investors hold MPLX?
2 tracked institutional investors disclosed a position in MPLX (MPLX LP) in their most recent 13F filing.
Who is the largest institutional holder of MPLX?
Ken Griffin, Citadel Advisors, holds the largest disclosed position in MPLX, valued at $97M.
Did institutional ownership of MPLX increase or decrease?
Across recent 13F filings, tracked investors recorded 1 new positions, 2 increased, 4 reduced, and 0 fully exited MPLX.
Where does this MPLX ownership data come from?
SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.