Mplx LP (MPLX) Quarterly Institutional 13F Update (Q2 2026)

MPLX ranks #876 out of 37696 tracked stocks by institutional interest — one of the most closely watched names in our coverage.

MPLX is a disclosed holding of Stephen Schwarzman (Blackstone Group), one of the tracked superinvestors on AlphaSMO — it makes up 2.2% of that fund's own 13F portfolio.

MPLX is a top-conviction position for Fractal Investments LLC — at 10.8% of their entire disclosed 13F portfolio, it's one of their largest single bets, not just a passing allocation.

The largest dollar stake in MPLX belongs to Alps Advisors Inc, but the position matters far more to Fractal Investments LLC, who has 10.8% of their own portfolio riding on it — a reminder that the biggest holder by size and the holder with the biggest bet aren't always the same fund.

Walnut Private Equity Partners, LLC has added to its MPLX position for two straight quarters, increasing it by $1.4M to reach $16.6M today.

Chickasaw Capital Management LLC has trimmed its MPLX position for two straight quarters, cutting it by $302.6M while still holding $293.6M.

MPLX is down 1.8% today, and institutions have been net sellers of $556.6M this quarter — today's price move and the underlying institutional flow are pointing the same direction.

MPLX posted net income of $4.8B over the trailing twelve months.

• Profitable — net income of $4.8B over the trailing twelve months
• Revenue grew 3.1% year over year
• Net income improved year over year, from $4.4B to $4.8B
• Generated $5.9B in positive operating cash flow
• Current ratio of 1.23x — below the conventional 1.5x liquidity buffer
• Liabilities run 1.96x equity — within a conventional range