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MPLX · Mplx LP

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$59.25 -0.26 (-0.44%) At close · Aug 28
Market Cap
$60.33B
Shares
1.01B

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 632
Total Value: $10,976,985,550
Total Shares: 194,888,532
Showing 1–100 of 641 holdings by value · page 1 of 7

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 632 13F filers · Δ vs Mar 31, 2026
Top Holder
14.7%
Sep 2023 → Jun 2026 · range 10.0% – 14.7%
+1.6 pts
Top 5
41.9%
Sep 2023 → Jun 2026 · range 37.3% – 46.6%
+0.1 pts
Top 10
57.2%
Sep 2023 → Jun 2026 · range 54.1% – 62.0%
+1.0 pts
HHI
491
Sep 2023 → Jun 2026 · range 394 – 576
Broadly held+28

Quarterly Activity

vs Mar 31, 2026
New
59
Increased
243
Decreased
147
Sold Out
78
Unchanged
183
Holder count: -19
Institutional value: -6.9%
Shares held: -5.7%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 641
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1552000 CUSIP 55336V100 13F (30d) 414 filings 381 filers Visit website Investor relations