MPLX — MPLX LP

Ownership history in Heronetta Management, L.P.  ·  50 quarters on record

This page tracks every 13F SEC filing in which Heronetta Management, L.P. reported a position in MPLX LP (MPLX). Data includes quarterly share count, position size as % of portfolio, estimated market value, and end-of-quarter stock price — sourced directly from SEC EDGAR 13F filings.

Peak position
10.41% (2025 Q1)
Avg. % of fund
6.43%
First filed
2013 Q3
Last filed
2025 Q4
Quarters held
50
Quarter Action Shares Change Chg % % of Fund Mkt Value Price (EOQ)
2025 Q4 REDUCED 323,639 -32,425 -9.1% 9.99% $17.3M $52.34
2025 Q3 UNCHANGED 356,064 — 0% 9.74% $17.8M $47.97
2025 Q2 UNCHANGED 356,064 — 0% 10.22% $18.3M $48.54
2025 Q1 ADDED 356,064 +500 +0.1% 10.41% $19.1M $49.47
46 older quarters hidden  —  Sign in free or upgrade to Premium to see full history
% of Fund (quarterly)    MPLX price (monthly, adj. close)

Other funds also holding MPLX

As of 2025 Q4 — sorted by position size

PPM AMERICA INC/IL 3Y 7Y 42.59% Fractal Investments LLC 3Y 15.29% CHICKASAW CAPITAL MANAGEMENT LLC 3Y 7Y 11.94% LONGFELLOW INVESTMENT MANAGEMENT CO LLC 3Y 7Y 9.23% TORTOISE CAPITAL ADVISORS, L.L.C. 3Y 7Y 9.05% KAYNE ANDERSON CAPITAL ADVISORS LP 3Y 7Y 8.76% Amplify Investments, LLC 8.53% WALNUT PRIVATE EQUITY PARTNERS, LLC 3Y 7Y 7.99% Belfer Management LLC 3Y 7Y 7.34% CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT 3Y 7Y 5.77%
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