MPLX LP - Limited Partnership
US ˙ NYSE ˙ US55336V1008

SecurityMPLX / MPLX LP - Limited Partnership
InstitutionFifth Third Bancorp
Latest Disclosed Ownership1,499 shares
Latest Disclosed Value $ 85,548
Fifth Third Bancorp ownership in MPLX / MPLX LP - Limited Partnership

On May 1, 2026 - Fifth Third Bancorp filed a 13F-HR form disclosing ownership of 1,499 shares of MPLX LP - Limited Partnership (US:MPLX) valued at $85,548 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 1,499 shares of MPLX LP - Limited Partnership. This represents a change in shares of 0.00% during the quarter. The current value of the position is $84,664 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)
2026-05-01 2026-03-31 13F MPLX COM UNIT REP LTD 55336V100 1,499 0 0.00 86 6.25 0.0002
2026-02-02 2025-12-31 13F MPLX COM UNIT REP LTD 55336V100 1,499 0 0.00 80 8.11 0.0003
2025-11-07 2025-09-30 13F MPLX COM UNIT REP LTD 55336V100 1,499 -1,666 -52.64 75 -54.60 0.0002
2025-07-15 2025-06-30 13F MPLX COM UNIT REP LTD 55336V100 3,165 227 7.73 163 3.82 0.0006
2025-04-15 2025-03-31 13F MPLX COM UNIT REP LTD 55336V100 2,938 0 0.00 157 12.14 0.0006
2025-01-21 2024-12-31 13F MPLX COM UNIT REP LTD 55336V100 2,938 -1,229 -29.49 141 -24.32 0.0005
2024-10-17 2024-09-30 13F MPLX COM UNIT REP LTD 55336V100 4,167 0 0.00 185 4.52 0.0007
2024-07-22 2024-06-30 13F MPLX COM UNIT REP LTD 55336V100 4,167 -833 -16.66 177 -14.49 0.0007
2024-04-23 2024-03-31 13F MPLX COM UNIT REP LTD 55336V100 5,000 -2,896 -36.68 208 -28.37 0.0008
2024-01-19 2023-12-31 13F MPLX COM UNIT REP LTD 55336V100 7,896 0 0.00 290 3.21 0.0012
2023-10-31 2023-09-30 13F MPLX COM UNIT REP LTD 55336V100 7,896 -490 -5.84 281 -1.41 0.0013
2023-07-26 2023-06-30 13F MPLX COM UNIT REP LTD 55336V100 8,386 0 0.00 285 -1.39 0.0013
2023-04-24 2023-03-31 13F MPLX COM UNIT REP LTD 55336V100 8,386 0 0.00 289 4.73 0.0013
2023-01-25 2022-12-31 13F MPLX COM UNIT REP LTD 55336V100 8,386 -300 -3.45 275 5.36 0.0013
2022-10-25 2022-09-30 13F MPLX COM UNIT REP LTD 55336V100 8,686 0 0.00 261 3.16 0.0014
2022-08-04 2022-06-30 13F MPLX COM UNIT REP LTD 55336V100 8,686 -735 -7.80 253 -19.17 0.0012
2022-04-19 2022-03-31 13F MPLX COM UNIT REP LTD 55336V100 9,421 -2,998 -24.14 313 -14.71 0.0013
2022-02-01 2021-12-31 13F MPLX COM UNIT REP LTD 55336V100 12,419 964 8.42 367 12.58 0.0014
2021-10-15 2021-09-30 13F MPLX COM UNIT REP LTD 55336V100 11,455 -35,050 -75.37 326 -76.33 0.0014
2021-08-06 2021-06-30 13F MPLX COM UNIT REP LTD 55336V100 46,505 -26 -0.06 1,377 15.42 0.0060
2021-05-07 2021-03-31 13F MPLX COM UNIT REP LTD 55336V100 46,531 4,902 11.78 1,193 32.41 0.0055
2021-02-16 2020-12-31 13F MPLX COM UNIT REP LTD 55336V100 41,629 959 2.36 901 40.78 0.0044
2020-11-09 2020-09-30 13F MPLX COM UNIT REP LTD 55336V100 40,670 3,203 8.55 640 -1.08 0.0035
2020-08-05 2020-06-30 13F MPLX COM UNIT REP LTD 55336V100 37,467 3,410 10.01 647 63.38 0.0039
2020-05-05 2020-03-31 13F MPLX COM UNIT REP LTD 55336V100 34,057 20,874 158.34 396 17.86 0.0028
2020-02-14 2019-12-31 13F MPLX COM UNIT REP LTD 55336V100 13,183 5,511 71.83 336 56.28 0.0019
2019-11-14 2019-09-30 13F MPLX COM UNIT REP LTD 55336V100 7,672 1,531 24.93 215 8.59 0.0013
2019-08-07 2019-06-30 13F MPLX COM UNIT REP LTD 55336V100 6,141 867 16.44 198 14.45 0.0012
2019-05-14 2019-03-31 13F MPLX COM UNIT REP LTD 55336V100 5,274 -599 -10.20 173 -2.81 0.0011
2019-02-14 2018-12-31 13F MPLX COM UNIT REP LTD 55336V100 5,873 2,834 93.25 178 69.52 0.0013
2018-11-14 2018-09-30 13F MPLX COM UNIT REP LTD 55336V100 3,039 -868 -22.22 105 -21.05 0.0007
2018-08-14 2018-06-30 13F MPLX COM UNIT REP LTD 55336V100 3,907 -4,725 -54.74 133 -53.33 0.0009
2018-05-15 2018-03-31 13F MPLX COM UNIT REP LTD 55336V100 8,632 -826 -8.73 285 -14.93 0.0019
2018-02-14 2017-12-31 13F MPLX COM UNIT REP LTD 55336V100 9,458 -6,700 -41.47 335 -40.81 0.0023
2017-11-14 2017-09-30 13F MPLX COM UNIT REP LTD 55336V100 16,158 -6,127 -27.49 566 -23.92 0.0040
2017-08-11 2017-06-30 13F MPLX COM UNIT REP LTD 55336V100 22,285 4,486 25.20 744 15.89 0.0055
2017-05-12 2017-03-31 13F MPLX COM UNIT REP LTD 55336V100 17,799 6,562 58.40 642 65.04 0.0049
2017-02-13 2016-12-31 13F/A-1 MPLX COM UNIT REP LTD 55336V100 11,237 2,258 25.15 389 27.96 0.0031
2017-02-09 2016-12-31 13F MPLX COM UNIT REP LTD 55336V100 8,979 0 304 0.0025
2016-11-10 2016-09-30 13F MPLX COM UNIT REP LTD 55336V100 8,979 -3,540 -28.28 304 -27.79 0.0025
2016-08-11 2016-06-30 13F MPLX COM UNIT REP L 55336V100 12,519 10,239 449.08 421 519.12 0.0036
2016-05-13 2016-03-31 13F MPLX COM UNIT REP LTD 55336V100 2,280 -408 -15.18 68 -35.85 0.0006
2016-02-16 2015-12-31 13F MPLX COM UNIT REP L 55336V100 2,688 2,053 323.31 106 341.67 0.0009
2015-11-13 2015-09-30 13F MPLX COM UNIT REP LTD 55336V100 635 0 0.00 24 -46.67 0.0002
2015-08-14 2015-06-30 13F MPLX COM UNIT REP LTD 55336V100 635 0 0.00 45 -4.26 0.0004
2015-05-14 2015-03-31 13F MPLX COM UNIT REP LTD 55336V100 635 0 0.00 47 0.00 0.0004
2015-02-13 2014-12-31 13F MPLX COM UNIT REP LTD 55336V100 635 335 111.67 47 161.11 0.0004
2014-11-17 2014-09-30 13F MPLX COM UNIT REP LTD 55336V100 300 0 0.00 18 -5.26 0.0002
2014-08-14 2014-06-30 13F MPLX COM UNIT REP LTD 55336V100 300 -1,000 -76.92 19 -70.31 0.0002
2014-05-15 2014-03-31 13F MPLX COM UNIT REP LTD 55336V100 1,300 0 0.00 64 10.34 0.0006
2014-02-14 2013-12-31 13F MPLX COM UNIT REP LTD 55336V100 1,300 0 0.00 58 23.40 0.0006
2013-11-14 2013-09-30 13F MPLX COM UNIT REP LTD 55336V100 1,300 0 0.00 47 -2.08 0.0005
2013-08-14 2013-06-30 13F MPLX COM UNIT REP L 55336V100 1,300 1,300 48 0.0005
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.