MPLX LP - Limited Partnership
US ˙ NYSE ˙ US55336V1008

SecurityMPLX / MPLX LP - Limited Partnership
InstitutionCIBC Private Wealth Group, LLC
Latest Disclosed Ownership2,724,200 shares
Latest Disclosed Value $ 145,390,554
CIBC Private Wealth Group, LLC reports 1.34% increase in ownership of MPLX / MPLX LP - Limited Partnership

On February 12, 2026 - CIBC Private Wealth Group, LLC filed a 13F-HR form disclosing ownership of 2,724,200 shares of MPLX LP - Limited Partnership (US:MPLX) valued at $145,390,554 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 24, 2025 disclosing 2,688,090 shares of MPLX LP - Limited Partnership. This represents a change in shares of 1.34% during the quarter. The current value of the position is $153,862,816 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)
2026-02-12 2025-12-31 13F MPLX COM UNIT REP LTD 55336V100 2,724,200 36,110 1.34 145,391 8.28 0.2458
2025-11-24 2025-09-30 13F MPLX COM UNIT REP LTD 55336V100 2,688,090 -35,979 -1.32 134,270 -4.31 0.2299
2025-08-12 2025-06-30 13F MPLX COM UNIT REP LTD 55336V100 2,724,069 -174,110 -6.01 140,317 3.72 0.2506
2025-05-14 2025-03-31 13F MPLX COM UNIT REP LTD 55336V100 2,898,179 -8,827 -0.30 135,287 -4.01 0.2857
2025-02-12 2024-12-31 13F Marathon Petroleum COM UNIT REP LTD 55336V100 2,907,006 20,941 0.73 140,932 9.83 0.2555
2024-11-13 2024-09-30 13F Marathon Petroleum COM UNIT REP LTD 55336V100 2,886,065 188,758 7.00 128,314 12.38 0.2299
2024-08-09 2024-06-30 13F Marathon Petroleum COM UNIT REP LTD 55336V100 2,697,307 -88,216 -3.17 114,177 -0.80 0.2141
2024-05-10 2024-03-31 13F MPLX COM UNIT REP LTD 55336V100 2,785,523 -242,804 -8.02 115,098 3.50 0.2255
2024-02-13 2023-12-31 13F MPLX LP COM UNIT REP COM 55336V100 3,028,327 574,737 23.42 111,200 27.41 0.2355
2023-11-13 2023-09-30 13F MPLX LP COM UNIT REP COM 55336V100 2,453,590 -173,475 -6.60 87,274 -2.12 0.2065
2023-11-21 2023-06-30 13F/A-1 MPLX LP COM UNIT REP COM 55336V100 2,627,065 6,578 0.25 89,163 18.26 0.1949
2023-08-10 2023-06-30 13F MPLX LP COM UNIT REP COM 55336V100 2,627,065 6,578 89,163 0.1950
2023-11-21 2023-03-31 13F/A-1 MPLX LP COM UNIT REP COM 55336V100 2,620,487 -428,009 -14.04 75,398 -23.30 0.1669
2023-05-12 2023-03-31 13F MPLX LP COM UNIT REP COM 55336V100 2,620,487 -428,009 75,398 0.1639
2023-06-01 2022-12-31 13F/A-2 MPLX LP COM UNIT REP COM 55336V100 3,048,496 -611,550 -16.71 98,298 -10.51 0.3302
2023-02-14 2022-12-31 13F/A-1 MPLX LP COM UNIT REP COM 55336V100 3,048,496 -611,550 100,113 0.2096
2023-02-13 2022-12-31 13F MPLX LP COM UNIT REP COM 55336V100 3,048,496 -611,550 100,113 0.0001
2022-11-15 2022-09-30 13F MPLX LP COM UNIT REP COM 55336V100 3,660,046 -1,228,903 -25.14 109,838 -22.93 0.2958
2022-08-03 2022-06-30 13F MPLX LP COM UNIT REP LTD 55336V100 4,888,949 -27,018 -0.55 142,513 -12.63 0.3701
2022-05-16 2022-03-31 13F MPLX LP COM UNIT REP LTD 55336V100 4,915,967 -1,627,615 -24.87 163,112 -15.76 0.3560
2022-04-04 2021-12-31 13F/A-1 MPLX LP COM UNIT REP LTD 55336V100 6,543,582 -681,242 -9.43 193,624 -5.87 0.4016
2022-02-08 2021-12-31 13F MPLX LP COM UNIT REP LTD 55336V100 6,543,582 -681,242 193,624 0.3139
2021-11-12 2021-09-30 13F MPLX LP COM UNIT REP LTD 55336V100 7,224,824 -1,285,373 -15.10 205,690 -18.37 0.4785
2021-08-16 2021-06-30 13F MPLX LP COM UNIT REP LTD 55336V100 8,510,197 -970,973 -10.24 251,987 3.70 0.5788
2021-05-12 2021-03-31 13F MPLX COM UNIT REP LTD 55336V100 9,481,170 233,680 2.53 243,002 21.37 0.6118
2021-02-12 2020-12-31 13F MPLX COM UNIT REP LTD 55336V100 9,247,490 -135,776 -1.45 200,209 35.56 0.5293
2020-11-03 2020-09-30 13F/A-1 MPLX COM UNIT REP LTD 55336V100 9,383,266 538,277 6.09 147,693 -3.37 0.4524
2020-08-13 2020-06-30 13F MPLX LP COM UNIT REP Com 55336V100 8,844,989 1,519,987 20.75 152,841 79.57 0.7428
2020-05-15 2020-03-31 13F MPLX COM UNIT REP LTD 55336V100 7,325,002 -2,248,080 -23.48 85,116 -65.08 0.3650
2020-01-30 2019-12-31 13F MPLX COM UNIT REP LTD 55336V100 9,573,082 62,002 0.65 243,730 -8.51 0.7950
2019-10-16 2019-09-30 13F MPLX LP COM UNIT REP LTD 55336V100 9,511,080 6,161,044 183.91 266,404 147.04 0.9371
2019-07-31 2019-06-30 13F MPLX COM UNIT REP LTD 55336V100 3,350,036 38,161 1.15 107,837 -1.00 0.3784
2019-05-10 2019-03-31 13F MPLX LP COM UNIT REP LTD 55336V100 3,311,875 -442,620 -11.79 108,928 -4.25 0.4202
2019-02-05 2018-12-31 13F MPLX COM UNIT REP LTD 55336V100 3,754,495 -973,108 -20.58 113,762 -30.61 0.5072
2018-11-14 2018-09-30 13F MPLX LP COM UNIT REP LTD 55336V100 4,727,603 -81,351 -1.69 163,954 -0.14 0.6216
2018-08-02 2018-06-30 13F MPLX LP COM UNIT REP LTD 55336V100 4,808,954 -2,757,192 -36.44 164,178 -34.33 0.6695
2018-05-17 2018-03-31 13F MPLX LP COM UNIT REP LTD 55336V100 7,566,146 235,681 3.22 249,986 -3.86 1.0865
2018-02-12 2017-12-31 13F MPLX COM UNIT REP LTD 55336V100 7,330,465 273,710 3.88 260,012 5.24 1.1028
2017-12-21 2017-09-30 13F/A-1 MPLX LP COM UNIT REP UNIT REP LTD 55336V100 7,056,755 303,471 4.49 247,057 9.53 1.1261
2017-11-14 2017-09-30 13F MPLX LP COM UNIT REP COM 55336V100 7,056,755 303,471 247,057
2017-08-09 2017-06-30 13F MPLX LP COM UNIT REP Com 55336V100 6,753,284 187,807 2.86 225,561 -4.78 1.4162
2017-05-10 2017-03-31 13F MPLX LP COM UNIT REP Com 55336V100 6,565,477 362,343 5.84 236,883 10.31 1.4881
2017-02-13 2016-12-31 13F MPLX LP COM UNIT REP Com 55336V100 6,203,134 769,246 14.16 214,752 16.72 1.4199
2016-11-09 2016-09-30 13F MPLX LP COM UNIT REP Com 55336V100 5,433,888 478,986 9.67 183,992 10.42 1.2761
2016-08-11 2016-06-30 13F MPLX LP COM UNIT REP Com 55336V100 4,954,902 1,137,026 29.78 166,634 47.00 1.2165
2016-05-11 2016-03-31 13F MPLX LP COM UNIT REP Com 55336V100 3,817,876 1,467,878 62.46 113,354 22.64 0.8759
2016-02-10 2015-12-31 13F MPLX LP COM UNIT REP Com 55336V100 2,349,998 2,300,146 4,613.95 92,425 4,751.71 0.7232
2015-11-12 2015-09-30 13F MPLX LP COM UNIT REP Com 55336V100 49,852 -183,385 -78.63 1,905 -88.56 0.0157
2015-08-13 2015-06-30 13F MPLX LP COM UNIT REP Com 55336V100 233,237 49,989 27.28 16,648 24.01 0.1212
2015-05-11 2015-03-31 13F MPLX LP COM UNIT REP Com 55336V100 183,248 151,640 479.75 13,425 478.17 0.0992
2015-02-12 2014-12-31 13F MPLX LP COM UNIT REP Com 55336V100 31,608 0 0.00 2,322 24.64 0.0178
2014-11-12 2014-09-30 13F MPLX LP COM UNIT REP Com 55336V100 31,608 -382 -1.19 1,863 -9.69 0.0147
2014-08-13 2014-06-30 13F MPLX LP COM UNIT REP Com 55336V100 31,990 -47,463 -59.74 2,063 -46.86 0.0167
2014-05-14 2014-03-31 13F MPLX LP COM UNIT REP COM 55336V100 79,453 79,453 3,882 0.0330
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.