MPLX LP - 합자회사
US ˙ NYSE ˙ US55336V1008

SecurityMPLX / MPLX LP - Limited Partnership
InstitutionBlackRock, Inc.
Latest Disclosed Ownership141,239 shares
Latest Disclosed Value $ 8,060,493
BlackRock, Inc. reports 0.26% decrease in ownership of MPLX / MPLX LP - Limited Partnership

On May 13, 2026 - BlackRock, Inc. filed a 13F-HR form disclosing ownership of 141,239 shares of MPLX LP - Limited Partnership (US:MPLX) valued at $8,060,510 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 141,610 shares of MPLX LP - Limited Partnership. This represents a change in shares of -0.26% during the quarter. The current value of the position is $7,977,179 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)
2026-05-13 2026-03-31 13F MPLX COM UNIT REP LTD 55336V100 141,239 -371 -0.26 8,060 6.66 0.0001
2026-02-12 2025-12-31 13F MPLX COM UNIT REP LTD 55336V100 141,610 -441,982 -75.73 7,558 -74.08 0.0001
2025-11-12 2025-09-30 13F MPLX COM UNIT REP LTD 55336V100 583,592 -2,001 -0.34 29,150 -3.36 0.0005
2025-08-12 2025-06-30 13F MPLX COM UNIT REP LTD 55336V100 585,593 474,842 428.75 30,164 408.91 0.0006
2025-05-02 2025-03-31 13F MPLX COM UNIT REP LTD 55336V100 110,751 18,776 20.41 5,927 34.67 0.0001
2025-02-07 2024-12-31 13F MPLX COM UNIT REP LTD 55336V100 91,975 0 0.00 4,402 7.63 0.0001
2024-11-13 2024-09-30 13F MPLX COM UNIT REP LTD 55336V100 91,975 -5 -0.01 4,089 4.39 0.0001
2024-08-13 2024-06-30 13F MPLX COM UNIT REP LTD 55336V100 91,980 1 0.00 3,917 2.49 0.0001
2024-05-10 2024-03-31 13F MPLX COM UNIT REP LTD 55336V100 91,979 -743 -0.80 3,823 12.28 0.0001
2024-02-13 2023-12-31 13F MPLX COM UNIT REP LTD 55336V100 92,722 4,095 4.62 3,405 7.99 0.0001
2023-11-13 2023-09-30 13F MPLX COM UNIT REP LTD 55336V100 88,627 12,178 15.93 3,152 21.51 0.0001
2023-08-11 2023-06-30 13F MPLX COM UNIT REP LTD 55336V100 76,449 5,474 7.71 2,595 6.09 0.0001
2023-05-12 2023-03-31 13F MPLX COM UNIT REP LTD 55336V100 70,975 1,465 2.11 2,445 7.14 0.0001
2023-02-13 2022-12-31 13F MPLX COM UNIT REP LTD 55336V100 69,510 -15,807 -18.53 2,283 -10.89 0.0001
2022-11-14 2022-09-30 13F MPLX COM UNIT REP LTD 55336V100 85,317 -1,419 -1.64 2,561 1.31 0.0001
2022-08-12 2022-06-30 13F MPLX COM UNIT REP LTD 55336V100 86,736 4,094 4.95 2,528 -7.80 0.0001
2022-05-12 2022-03-31 13F MPLX COM UNIT REP LTD 55336V100 82,642 -2,819 -3.30 2,742 8.47 0.0001
2022-02-10 2021-12-31 13F MPLX COM UNIT REP LTD 55336V100 85,461 -51 -0.06 2,528 3.86 0.0001
2021-11-09 2021-09-30 13F MPLX COM UNIT REP LTD 55336V100 85,512 -1,114 -1.29 2,434 -5.11 0.0001
2021-08-11 2021-06-30 13F MPLX COM UNIT REP LTD 55336V100 86,626 2,997 3.58 2,565 19.64 0.0001
2021-05-07 2021-03-31 13F MPLX COM UNIT REP LTD 55336V100 83,629 -5,315 -5.98 2,144 11.32 0.0001
2021-02-05 2020-12-31 13F MPLX COM UNIT REP LTD 55336V100 88,944 -9,687 -9.82 1,926 24.10 0.0001
2020-11-06 2020-09-30 13F MPLX COM UNIT REP LTD 55336V100 98,631 -5,110 -4.93 1,552 -13.39 0.0001
2020-08-14 2020-06-30 13F MPLX COM UNIT REP LTD 55336V100 103,741 -2,311,162 -95.70 1,792 -93.61 0.0001
2020-05-01 2020-03-31 13F MPLX COM UNIT REP LTD 55336V100 2,414,903 -23,254 -0.95 28,061 -54.80 0.0014
2020-02-13 2019-12-31 13F MPLX COM UNIT REP LTD 55336V100 2,438,157 117,734 5.07 62,075 -4.49 0.0024
2019-11-08 2019-09-30 13F MPLX COM UNIT REP LTD 55336V100 2,320,423 52,217 2.30 64,995 -10.98 0.0027
2019-08-22 2019-06-30 13F/A-1 MPLX COM UNIT REP LTD 55336V100 2,268,206 26,555 1.18 73,013 -0.97 0.0031
2019-08-13 2019-06-30 13F MPLX COM UNIT REP LTD 55336V100 2,268,206 26,555 73,013
2019-05-09 2019-03-31 13F MPLX COM UNIT REP LTD 55336V100 2,241,651 -16,405 -0.73 73,727 7.76 0.0033
2019-02-08 2018-12-31 13F MPLX COM UNIT REP LTD 55336V100 2,258,056 -4,724 -0.21 68,419 -12.81 0.0035
2018-11-09 2018-09-30 13F MPLX COM UNIT REP LTD 55336V100 2,262,780 294,551 14.97 78,473 16.78 0.0034
2018-08-09 2018-06-30 13F MPLX COM UNIT REP LTD 55336V100 1,968,229 -24,229 -1.22 67,195 2.07 0.0031
2018-05-09 2018-03-31 13F MPLX COM UNIT REP LTD 55336V100 1,992,458 -2,415 -0.12 65,831 -6.96 0.0031
2018-02-09 2017-12-31 13F MPLX COM UNIT REP LTD 55336V100 1,994,873 48,111 2.47 70,758 3.82 0.0034
2017-11-14 2017-09-30 13F MPLX COM UNIT REP LTD 55336V100 1,946,762 275,280 16.47 68,157 22.08 0.0034
2017-08-10 2017-06-30 13F MPLX COM UNIT REP LTD 55336V100 1,671,482 8,054 0.48 55,828 -6.98 0.0030
2017-05-12 2017-03-31 13F MPLX COM UNIT REP LTD 55336V100 1,663,428 1,663,428 60,016 0.0033
2016-05-10 2016-03-31 13F MPLX COM UNIT REP LTD 55336V100 0 -5,440 -100.00 0 -100.00
2016-02-11 2015-12-31 13F MPLX COM UNIT REP LTD 55336V100 5,440 1,780 48.63 214 52.86 0.0003
2015-11-13 2015-09-30 13F MPLX COM UNIT REP LTD 55336V100 3,660 947 34.91 140 -27.84 0.0002
2015-08-07 2015-06-30 13F MPLX COM UNIT REP LTD 55336V100 2,713 452 19.99 194 16.87 0.0003
2015-05-13 2015-03-31 13F MPLX COM UNIT REP LTD 55336V100 2,261 2,261 166 0.0002
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.