MPLX LP - Limited Partnership
US ˙ NYSE ˙ US55336V1008

SecurityMPLX / MPLX LP - Limited Partnership
InstitutionPrivate Advisor Group, LLC
Latest Disclosed Ownership53,692 shares
Latest Disclosed Value $ 3,064,201
Private Advisor Group, LLC reports 4.58% decrease in ownership of MPLX / MPLX LP - Limited Partnership

On April 24, 2026 - Private Advisor Group, LLC filed a 13F-HR form disclosing ownership of 53,692 shares of MPLX LP - Limited Partnership (US:MPLX) valued at $3,064,202 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 56,267 shares of MPLX LP - Limited Partnership. This represents a change in shares of -4.58% during the quarter. The current value of the position is $2,967,020 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-04-24 2026-03-31 13F MPLX COM UNIT REP LTD 55336V100 53,692 -2,575 -4.58 3,064 2.07 0.0136
2026-02-17 2025-12-31 13F MPLX COM UNIT REP LTD 55336V100 56,267 -3,130 -5.27 3,003 1.21 0.0135
2025-11-13 2025-09-30 13F MPLX COM UNIT REP LTD 55336V100 59,397 2,239 3.92 2,967 0.75 0.0146
2025-08-11 2025-06-30 13F MPLX COM UNIT REP LTD 55336V100 57,158 4,681 8.92 2,944 4.84 0.0159
2025-05-05 2025-03-31 13F MPLX COM UNIT REP LTD 55336V100 52,477 722 1.40 2,809 13.41 0.0170
2025-02-03 2024-12-31 13F MPLX COM UNIT REP LTD 55336V100 51,755 -1,985 -3.69 2,477 3.64 0.0139
2024-10-22 2024-09-30 13F MPLX COM UNIT REP LTD 55336V100 53,740 0 0.00 2,389 4.41 0.0148
2024-08-05 2024-06-30 13F MPLX COM UNIT REP LTD 55336V100 53,740 -1,849 -3.33 2,289 -0.95 0.0154
2024-04-30 2024-03-31 13F MPLX COM UNIT REP LTD 55336V100 55,589 2,260 4.24 2,310 17.98 0.0166
2024-02-06 2023-12-31 13F MPLX COM UNIT REP LTD 55336V100 53,329 37 0.07 1,958 3.32 0.0152
2023-11-03 2023-09-30 13F MPLX COM UNIT REP LTD 55336V100 53,292 4,875 10.07 1,896 12.46 0.0169
2023-08-10 2023-06-30 13F MPLX COM UNIT REP LTD 55336V100 48,417 27,609 132.68 1,686 135.34 0.0147
2023-05-10 2023-03-31 13F MPLX COM UNIT REP LTD 55336V100 20,808 1,890 9.99 717 0.0068
2023-01-18 2022-12-31 13F MPLX COM UNIT REP LTD 55336V100 18,918 6,831 56.52 1 -100.00 0.0000
2022-10-14 2022-09-30 13F MPLX COM UNIT REP LTD 55336V100 12,087 19 0.16 363 3.13 0.0042
2022-07-13 2022-06-30 13F MPLX COM UNIT REP LTD 55336V100 12,068 -758 -5.91 352 -17.37 0.0031
2022-05-12 2022-03-31 13F/A-1 MPLX COM UNIT REP LTD 55336V100 12,826 4,247 49.50 426 67.72 0.0033
2022-05-10 2022-03-31 13F MPLX COM UNIT REP LTD 55336V100 8,579 0 254 0.0019
2022-02-10 2021-12-31 13F MPLX COM UNIT REP LTD 55336V100 8,579 8,579 254 0.0019
2020-10-30 2020-09-30 13F MPLX COM UNIT REP LTD 55336V100 0 -3,174 -100.00 0 -100.00
2020-08-17 2020-06-30 13F MPLX COM UNIT REP LTD 55336V100 3,174 3,174 55 0.0008
2019-11-13 2019-09-30 13F MPLX COM UNIT REP LTD 55336V100 0 -6,942 -100.00 0 -100.00
2019-08-14 2019-06-30 13F MPLX COM UNIT REP LTD 55336V100 6,942 6,942 223 0.0040
2017-08-10 2017-06-30 13F MPLX COM UNIT REP LTD 55336V100 0 -5,441 -100.00 0 -100.00
2017-05-10 2017-03-31 13F MPLX COM UNIT REP LTD 55336V100 5,441 5,441 201 0.0056
2016-05-13 2016-03-31 13F MPLX COM UNIT REP LTD 55336V100 0 -7,089 -100.00 0 -100.00
2016-02-09 2015-12-31 13F MPLX COM UNIT REP LTD 55336V100 7,089 987 16.18 279 19.74 0.0134
2015-11-13 2015-09-30 13F MPLX COM UNIT REP LTD 55336V100 6,102 -3,177 -34.24 233 -64.86 0.0128
2015-08-13 2015-06-30 13F MPLX COM UNIT REP LTD 55336V100 9,279 -245 -2.57 663 -5.01 0.0315
2015-05-13 2015-03-31 13F MPLX COM UNIT REP LTD 55336V100 9,524 685 7.75 698 7.38 0.0402
2015-02-17 2014-12-31 13F MPLX COM UNIT REP LTD 55336V100 8,839 1,720 24.16 650 54.76 0.0419
2014-11-12 2014-09-30 13F MPLX COM UNIT REP LTD 55336V100 7,119 932 15.06 420 5.26 0.0290
2014-08-08 2014-06-30 13F MPLX COM UNIT REP LTD 55336V100 6,187 6,187 399 0.0343
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.