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Heronetta Management, L.P.

Position in MPLX — Mplx LP

CIK 1588225 NEW YORK, NY

Position in MPLX

as of Mar 31, 2026 · filed May 1, 2026
Position Value
$18,492,905
+$1,220,292 QoQ
Shares Held
324,039
+0.1% QoQ
Ownership
0.032%
of shares outstanding
% of Portfolio
16.88%
of 13F equity value
Holder Rank
not a current holder
Holding Since
Mar 2020
25 quarters on record
Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Common Shares in MPLX Over Time

Shares Held

Position Value (USD)

Position in Oil & Gas Midstream

Energy · as of Mar 31, 2026

Heronetta Management, L.P. holds $109,570,592 across 16 Oil & Gas Midstream names. MPLX ranks #2 (16.9% of the industry book) .

# Ticker Company Shares Value (USD) Open
2 MPLX
Mplx LP
This page
324,039 $18,492,905

All Filings in MPLX

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25 filing rows on record
Report Date Value (USD) Shares
2026-03-31 $18,492,905 324,039
2025-12-31 $17,272,613 323,639
2025-09-30 $17,785,396 356,064
2025-06-30 $18,340,856 356,064
2025-03-31 $19,056,545 356,064
2024-12-31 $17,017,293 355,564
2024-09-30 $15,932,863 358,364
2024-06-30 $15,262,722 358,364
2024-03-31 $14,839,579 357,064
2023-12-31 $13,302,334 362,264
2023-09-30 $12,017,822 337,864
2023-06-30 $11,290,616 332,664
2023-03-31 $11,439,777 332,069
2022-12-31 $15,123,903 460,533
2022-09-30 $13,136,487 437,737
2022-06-30 $12,690,073 435,337
2022-03-31 $13,973,325 421,137
2021-12-31 $12,343,083 417,137
2021-09-30 $11,747,775 412,637
2021-06-30 $11,871,744 400,937
2021-03-31 $10,022,278 391,037
2020-12-31 $8,310,071 383,837
2020-09-30 $5,805,494 368,837
2020-06-30 $6,190,335 358,237
2020-03-31 $4,147,607 356,937