MPLX LP - 有限合夥企業
US ˙ NYSE ˙ US55336V1008

SecurityMPLX / MPLX LP - Limited Partnership
InstitutionMorgan Stanley
Latest Disclosed Ownership4,964,199 shares
Latest Disclosed Value $ 283,306,899
Morgan Stanley reports 13.86% decrease in ownership of MPLX / MPLX LP - Limited Partnership

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 4,964,199 shares of MPLX LP - Limited Partnership (US:MPLX) valued at $283,306,837 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 5,763,110 shares of MPLX LP - Limited Partnership. This represents a change in shares of -13.86% during the quarter. The current value of the position is $280,328,318 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)
2026-05-15 2026-03-31 13F MPLX COM UNIT REP LTD 55336V100 4,964,199 -798,911 -13.86 283,307 -7.89 0.0171
2026-05-27 2025-12-31 13F/A-1 MPLX COM UNIT REP LTD 55336V100 5,763,110 1,104,510 23.71 307,577 32.18 0.0184
2026-02-13 2025-12-31 13F MPLX COM UNIT REP LTD 55336V100 5,763,110 1,104,510 307,577 0.0184
2026-05-27 2025-09-30 13F/A-1 MPLX COM UNIT REP LTD 55336V100 4,658,600 -586,044 -11.17 232,697 -13.86 0.0141
2025-11-14 2025-09-30 13F MPLX COM UNIT REP LTD 55336V100 4,658,600 -586,044 232,697 0.0141
2025-08-15 2025-06-30 13F MPLX COM UNIT REP LTD 55336V100 5,244,644 -1,210,903 -18.76 270,152 -21.81 0.0176
2025-05-15 2025-03-31 13F MPLX COM UNIT REP LTD 55336V100 6,455,547 873,705 15.65 345,501 29.33 0.0247
2025-05-15 2024-12-31 13F/A-1 MPLX COM UNIT REP LTD 55336V100 5,581,842 -875,114 -13.55 267,147 -6.94 0.0187
2025-02-14 2024-12-31 13F MPLX COM UNIT REP LTD 55336V100 5,581,842 -875,114 267,147 0.0187
2025-05-14 2024-09-30 13F/A-2 MPLX COM UNIT REP LTD 55336V100 6,456,956 -590,953 -8.38 287,076 -4.36 0.0208
2025-02-14 2024-09-30 13F/A-1 MPLX COM UNIT REP LTD 55336V100 6,456,956 -590,953 287,076 0.0208
2024-11-14 2024-09-30 13F MPLX COM UNIT REP LTD 55336V100 6,456,956 -590,953 287,076 0.0025
2025-05-14 2024-06-30 13F/A-2 MPLX COM UNIT REP LTD 55336V100 7,047,909 -1,425,571 -16.82 300,170 -14.76 0.0232
2024-10-17 2024-06-30 13F/A-1 MPLX COM UNIT REP LTD 55336V100 7,047,909 -1,425,571 300,170 0.0232
2024-08-14 2024-06-30 13F MPLX COM UNIT REP LTD 55336V100 7,047,909 -1,425,571 300,170 0.0232
2024-10-17 2024-03-31 13F/A-2 MPLX COM UNIT REP LTD 55336V100 8,473,480 2,733,979 47.63 352,158 67.09 0.0283
2024-08-16 2024-03-31 13F/A-1 MPLX COM UNIT REP LTD 55336V100 8,473,480 2,733,979 352,158 0.0033
2024-05-15 2024-03-31 13F MPLX COM UNIT REP LTD 55336V100 8,473,480 2,733,979 352,158 0.0283
2024-08-16 2023-12-31 13F/A-1 MPLX COM UNIT REP LTD 55336V100 5,739,501 -74,237 -1.28 210,755 1.91 0.0186
2024-02-13 2023-12-31 13F MPLX COM UNIT REP LTD 55336V100 5,739,501 -74,237 210,755 0.0186
2023-11-15 2023-09-30 13F MPLX COM UNIT REP LTD 55336V100 5,813,738 247,570 4.45 206,795 9.46 0.0210
2023-08-14 2023-06-30 13F MPLX COM UNIT REP LTD 55336V100 5,566,168 250,401 4.71 188,916 3.16 0.0186
2023-05-15 2023-03-31 13F MPLX COM UNIT REP LTD 55336V100 5,315,767 175,559 3.42 183,128 8.49 0.0196
2023-02-14 2022-12-31 13F MPLX COM UNIT REP LTD 55336V100 5,140,208 744,323 16.93 168,804 27.96 0.0192
2022-11-14 2022-09-30 13F MPLX COM UNIT REP LTD 55336V100 4,395,885 -58,465 -1.31 131,920 1.60 0.0180
2022-10-27 2022-06-30 13F/A-1 MPLX COM UNIT REP LTD 55336V100 4,454,350 -580,861 -11.54 129,844 -22.28 0.0169
2022-08-15 2022-06-30 13F MPLX COM UNIT REP LTD 55336V100 4,454,350 -580,861 129,844 0.0034
2022-10-27 2022-03-31 13F/A-1 MPLX COM UNIT REP LTD 55336V100 5,035,211 -511,413 -9.22 167,069 1.79 0.0225
2022-05-13 2022-03-31 13F MPLX COM UNIT REP LTD 55336V100 5,035,211 -511,413 167,069 0.0225
2022-02-14 2021-12-31 13F MPLX COM UNIT REP LTD 55336V100 5,546,624 478,409 9.44 164,124 13.74 0.0203
2021-11-15 2021-09-30 13F MPLX COM UNIT REP LTD 55336V100 5,068,215 -169,967 -3.24 144,292 -6.97 0.0194
2021-08-23 2021-06-30 13F/A-1 MPLX COM UNIT REP LTD 55336V100 5,238,182 -248,664 -4.53 155,103 10.29 0.0205
2021-08-16 2021-06-30 13F MPLX COM UNIT REP LTD 55336V100 5,238,182 -248,664 155,103 0.0043
2021-05-17 2021-03-31 13F MPLX COM UNIT REP LTD 55336V100 5,486,846 -2,117,808 -27.85 140,627 -14.59 0.0207
2021-02-16 2020-12-31 13F MPLX COM UNIT REP LTD 55336V100 7,604,654 -1,222,600 -13.85 164,642 18.50 0.0254
2020-11-13 2020-09-30 13F MPLX COM UNIT REP LTD 55336V100 8,827,254 623,602 7.60 138,941 -1.99 0.0269
2020-08-14 2020-06-30 13F MPLX COM UNIT REP LTD 55336V100 8,203,652 2,085,039 34.08 141,759 99.38 0.0314
2020-05-26 2020-03-31 13F/A-1 MPLX COM UNIT REP LTD 55336V100 6,118,613 -735,892 -10.74 71,099 -59.26 0.0193
2020-05-15 2020-03-31 13F MPLX COM UNIT REP LTD 55336V100 6,118,613 -735,892 71,099 5,461.8854
2020-02-14 2019-12-31 13F MPLX COM UNIT REP LTD 55336V100 6,854,505 755,460 12.39 174,515 2.15 0.0406
2019-11-14 2019-09-30 13F MPLX COM UNIT REP LTD 55336V100 6,099,045 866,326 16.56 170,834 1.42 0.0452
2019-08-14 2019-06-30 13F MPLX COM UNIT REP LTD 55336V100 5,232,719 -214,702 -3.94 168,441 -5.99 0.0448
2019-05-15 2019-03-31 13F MPLX COM UNIT REP LTD 55336V100 5,447,421 888,215 19.48 179,166 29.69 0.0507
2019-02-14 2018-12-31 13F MPLX COM UNIT REP LTD 55336V100 4,559,206 214,269 4.93 138,145 -8.32 0.0413
2019-04-23 2018-09-30 13F/A-2 MPLX COM UNIT REP LTD 55336V100 4,344,937 -111,876 -2.51 150,682 -0.97 0.0377
2018-11-20 2018-09-30 13F/A-1 MPLX COM UNIT REP LTD 55336V100 4,344,937 0 150,682 0.0377
2018-11-14 2018-09-30 13F MPLX COM UNIT REP LTD 55336V100 4,344,937 -111,876 150,682
2019-04-23 2018-06-30 13F/A-1 MPLX COM UNIT REP LTD 55336V100 4,456,813 -377,755 -7.81 152,156 -4.74 0.0411
2018-08-14 2018-06-30 13F MPLX COM UNIT REP LTD 55336V100 4,456,813 -377,755 152,156
2019-04-23 2018-03-31 13F/A-1 MPLX COM UNIT REP LTD 55336V100 4,834,568 -17,178,550 -78.04 159,734 -79.54 0.0443
2018-05-14 2018-03-31 13F MPLX COM UNIT REP LTD 55336V100 4,834,568 -17,178,550 159,734
2019-04-23 2017-12-31 13F/A-1 MPLX COM UNIT REP LTD 55336V100 22,013,118 1,661,981 8.17 780,805 9.59 0.2137
2018-02-14 2017-12-31 13F MPLX COM UNIT REP LTD 55336V100 22,013,118 1,661,981 780,805
2017-11-14 2017-09-30 13F MPLX COM UNIT REP LTD 55336V100 20,351,137 2,019,889 11.02 712,494 16.37 0.2134
2017-08-11 2017-06-30 13F MPLX COM UNIT REP LTD 55336V100 18,331,248 5,806,477 46.36 612,263 35.49 0.1850
2017-05-22 2017-03-31 13F/A-1 MPLX COM UNIT REP LTD 55336V100 12,524,771 -1,993,086 -13.73 451,895 -10.09 0.1389
2017-05-12 2017-03-31 13F MPLX COM UNIT REP LTD 55336V100 12,524,771 451,895
2017-02-22 2016-12-31 13F/A-1 MPLX COM UNIT REP LTD 55336V100 14,517,857 3,283,634 29.23 502,609 32.13 0.1645
2017-02-13 2016-12-31 13F MPLX COM UNIT REP LTD 55336V100 14,517,857 502,609
2016-11-10 2016-09-30 13F MPLX COM UNIT REP LTD 55336V100 11,234,223 -1,276,430 -10.20 380,391 -9.59 0.1299
2016-08-12 2016-06-30 13F MPLX COM UNIT REP LTD 55336V100 12,510,653 3,139,296 33.50 420,732 51.21 0.1520
2016-05-12 2016-03-31 13F MPLX COM UNIT REP LTD 55336V100 9,371,357 2,670,084 39.84 278,236 5.57 0.1071
2016-02-09 2015-12-31 13F MPLX COM UNIT REP LTD 55336V100 6,701,273 5,520,193 467.39 263,561 484.02 0.0954
2016-02-08 2015-09-30 13F/A-1 MPLX COM UNIT REP LTD 55336V100 1,181,080 294,731 33.25 45,129 -28.67 0.0167
2015-11-09 2015-09-30 13F MPLX COM UNIT REP LTD 55336V100 1,181,080 45,129
2015-08-12 2015-06-30 13F MPLX COM UNIT REP LTD 55336V100 886,349 -147,481 -14.27 63,268 -16.47 0.0219
2015-05-14 2015-03-31 13F MPLX COM UNIT REP LTD 55336V100 1,033,830 55,364 5.66 75,739 5.33 0.0279
2015-02-13 2014-12-31 13F MPLX COM UNIT REP LTD 55336V100 978,466 486,312 98.81 71,907 147.89 0.0263
2014-12-16 2014-09-30 13F/A-1 MPLX COM UNIT REP LTD 55336V100 492,154 105,098 27.15 29,008 52.98 0.0112
2014-11-14 2014-09-30 13F MPLX COM UNIT REP LTD 55336V100 492,154 29,008
2014-05-13 2014-03-31 13F MPLX COM UNIT REP LTD 55336V100 387,056 38,406 11.02 18,962 22.11 0.0079
2014-02-13 2013-12-31 13F MPLX COM UNIT REP LTD 55336V100 348,650 -97,702 -21.89 15,529 -4.53 0.0066
2013-11-13 2013-09-30 13F MPLX COM 55336V100 446,352 -64,237 -12.58 16,266 -13.46 0.0077
2013-08-08 2013-06-30 13F MPLX COM 55336V100 510,589 510,589 18,795 0.0095
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.