MPLX LP - Limited Partnership
US ˙ NYSE ˙ US55336V1008

SecurityMPLX / MPLX LP - Limited Partnership
InstitutionNeuberger Berman Group LLC
Latest Disclosed Ownership1,100,009 shares
Latest Disclosed Value $ 62,777,490
Neuberger Berman Group LLC reports 2.16% decrease in ownership of MPLX / MPLX LP - Limited Partnership

On May 14, 2026 - Neuberger Berman Group LLC filed a 13F-HR form disclosing ownership of 1,100,009 shares of MPLX LP - Limited Partnership (US:MPLX) valued at $62,777,514 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,124,270 shares of MPLX LP - Limited Partnership. This represents a change in shares of -2.16% during the quarter. The current value of the position is $60,786,497 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)
2026-05-14 2026-03-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 1,100,009 -24,261 -2.16 62,777 4.62 0.0244
2026-02-13 2025-12-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 1,124,270 29,089 2.66 60,002 9.68 0.0447
2025-11-12 2025-09-30 13F MPLX COMMON UNITS MLP COMMON 55336V100 1,095,181 47,037 4.49 54,704 1.32 0.0400
2025-08-25 2025-06-30 13F/A-1 MPLX COMMON UNITS MLP COMMON 55336V100 1,048,144 51,367 5.15 53,990 1.20 0.0415
2025-08-13 2025-06-30 13F MPLX COMMON UNITS MLP COMMON 55336V100 1,048,144 51,367 53,990 0.0215
2025-05-13 2025-03-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 996,777 352,782 54.78 53,348 73.09 0.0447
2025-02-13 2024-12-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 643,995 443,910 221.86 30,822 246.50 0.0245
2024-11-14 2024-09-30 13F MPLX COMMON UNITS MLP COMMON 55336V100 200,085 13,085 7.00 8,896 11.69 0.0069
2024-11-14 2024-06-30 13F/A-1 MPLX COMMON UNITS MLP COMMON 55336V100 187,000 -510 -0.27 7,964 2.21 0.0065
2024-08-13 2024-06-30 13F MPLX COMMON UNITS MLP COMMON 55336V100 187,000 -510 7,964 0.0065
2024-11-14 2024-03-31 13F/A-1 MPLX COMMON UNITS MLP COMMON 55336V100 187,510 -3,287 -1.72 7,793 11.22 0.0064
2024-05-13 2024-03-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 187,510 -3,287 7,793 0.0064
2024-11-14 2023-12-31 13F/A-2 MPLX COMMON UNITS MLP COMMON 55336V100 190,797 6,508 3.53 7,006 6.88 0.0061
2024-02-09 2023-12-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 190,797 6,508 7,006 0.0061
2023-11-14 2023-09-30 13F MPLX COMMON UNITS MLP COMMON 55336V100 184,289 -6,754 -3.54 6,555 1.10 0.0060
2023-08-11 2023-06-30 13F MPLX COMMON UNITS MLP COMMON 55336V100 191,043 -401 -0.21 6,484 -1.68 0.0058
2023-05-12 2023-03-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 191,444 2,671 1.41 6,595 6.39 0.0061
2023-02-13 2022-12-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 188,773 0 0.00 6,199 9.43 0.0061
2022-11-15 2022-09-30 13F MPLX COMMON UNITS MLP COMMON 55336V100 188,773 -3,741 -1.94 5,665 0.94 0.0059
2022-08-15 2022-06-30 13F MPLX COMMON UNITS MLP COMMON 55336V100 192,514 -168,356 -46.65 5,612 -53.13 0.0056
2022-05-23 2022-03-31 13F/A-1 MPLX COMMON UNITS MLP COMMON 55336V100 360,870 -22,130 -5.78 11,974 5.66 0.0101
2022-05-13 2022-03-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 360,870 -22,130 11,974 0.0053
2022-02-11 2021-12-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 383,000 -321,607 -45.64 11,333 -43.50 0.0089
2021-11-12 2021-09-30 13F MPLX COMMON UNITS MLP COMMON 55336V100 704,607 -15,701 -2.18 20,060 -5.95 0.0175
2021-08-13 2021-06-30 13F MPLX COMMON UNITS MLP COMMON 55336V100 720,308 -95,887 -11.75 21,328 1.96 0.0186
2021-05-13 2021-03-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 816,195 -133,460 -14.05 20,919 1.75 0.0200
2021-02-10 2020-12-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 949,655 135,838 16.69 20,560 60.51 0.0213
2020-11-12 2020-09-30 13F MPLX COMMON UNITS MLP COMMON 55336V100 813,817 62,279 8.29 12,809 -1.36 0.0152
2020-08-13 2020-06-30 13F MPLX COMMON UNITS MLP COMMON 55336V100 751,538 153,627 25.69 12,986 86.90 0.0161
2020-05-14 2020-03-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 597,911 -134,710 -18.39 6,948 -62.75 0.0106
2020-02-12 2019-12-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 732,621 -63,545 -7.98 18,653 -16.36 0.0218
2019-11-13 2019-09-30 13F MPLX COMMON UNITS MLP COMMON 55336V100 796,166 105,035 15.20 22,301 0.24 0.0272
2019-08-13 2019-06-30 13F MPLX COMMON UNITS MLP COMMON 55336V100 691,131 2,840 0.41 22,248 -1.72 0.0266
2019-05-13 2019-03-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 688,291 77,083 12.61 22,638 22.24 0.0277
2019-02-12 2018-12-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 611,208 -155,126 -20.24 18,520 -30.32 0.0258
2018-11-16 2018-09-30 13F/A-1 MPLX COMMON UNITS MLP COMMON 55336V100 766,334 -131,584 -14.65 26,577 -13.30 0.0301
2018-11-13 2018-09-30 13F MPLX COMMON UNITS MLP COMMON 55336V100 766,334 -131,584 26,577
2018-08-13 2018-06-30 13F MPLX COMMON UNITS MLP COMMON 55336V100 897,918 -7,679 -0.85 30,655 2.45 0.0338
2018-05-08 2018-03-31 13F MPLX COMMON UNITS MLP Common 55336V100 905,597 -949,733 -51.19 29,921 -54.53 0.0342
2018-02-14 2017-12-31 13F MPLX COMMON UNITS MLP COMMON 55336V100 1,855,330 -1,115,749 -37.55 65,809 -36.73 0.0756
2017-11-15 2017-09-30 13F MPLX COMMON STOCK 55336V100 2,971,079 -464,429 -13.52 104,017 -9.35 0.1301
2017-08-08 2017-06-30 13F MPLX COMMON STOCK 55336V100 3,435,508 -1,179,201 -25.55 114,746 -31.08 0.1474
2017-05-10 2017-03-31 13F MPLX COMMON STOCK 55336V100 4,614,709 886,696 23.78 166,499 29.00 0.2149
2017-02-06 2016-12-31 13F MPLX COMMON STOCK 55336V100 3,728,013 2,805,151 303.96 129,064 313.03 0.1733
2016-11-02 2016-09-30 13F MPLX COMMON STOCK 55336V100 922,862 377,778 69.31 31,248 70.47 0.0424
2016-08-05 2016-06-30 13F MPLX COMMON STOCK 55336V100 545,084 92,201 20.36 18,331 36.33 0.0253
2016-05-06 2016-03-31 13F MPLX COMMON STOCK 55336V100 452,883 388,318 601.44 13,446 429.58 0.0185
2016-01-28 2015-12-31 13F MPLX COMMON STOCK 55336V100 64,565 64,565 2,539 0.0033
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.