MPLX LP - Limited Partnership
US ˙ NYSE ˙ US55336V1008

SecurityMPLX / MPLX LP - Limited Partnership
InstitutionSmith, Moore & Co.
Latest Disclosed Ownership21,165 shares
Latest Disclosed Value $ 1,207,887
Smith, Moore & Co. reports 5.79% decrease in ownership of MPLX / MPLX LP - Limited Partnership

On May 5, 2026 - Smith, Moore & Co. filed a 13F-HR form disclosing ownership of 21,165 shares of MPLX LP - Limited Partnership (US:MPLX) valued at $1,207,887 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 22,465 shares of MPLX LP - Limited Partnership. This represents a change in shares of -5.79% during the quarter. The current value of the position is $1,169,578 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-05 2026-03-31 13F MPLX LP COM UNIT REP Stock 55336V100 21,165 -1,300 -5.79 1,208 0.75 0.0879
2026-01-23 2025-12-31 13F MPLX COM UNIT REP LTD 55336V100 22,465 -200 -0.88 1,199 5.83 0.0906
2025-11-12 2025-09-30 13F MPLX OM UNIT REP LTD 55336V100 22,665 80 0.35 1,132 -2.67 0.0867
2025-08-13 2025-06-30 13F MPLX COM UNIT REP LTD 55336V100 22,585 -1,650 -6.81 1,163 -10.33 0.0976
2025-05-15 2025-03-31 13F MPLX COM UNIT REP LTD 55336V100 24,235 -100 -0.41 1,297 11.43 0.1201
2025-02-13 2024-12-31 13F MPLX COM UNIT REP LTD 55336V100 24,335 -1,400 -5.44 1,165 1.75 0.1064
2024-11-12 2024-09-30 13F MPLX COM UNIT REP LTD 55336V100 25,735 -100 -0.39 1,144 4.00 0.1093
2024-08-14 2024-06-30 13F MPLX COM UNIT REP LTD 55336V100 25,835 -275 -1.05 1,100 1.38 0.1135
2024-05-13 2024-03-31 13F MPLX COM UNIT REP LTD 55336V100 26,110 -725 -2.70 1,085 10.15 0.1156
2024-02-13 2023-12-31 13F MPLX COM UNIT REP LTD 55336V100 26,835 -1,200 -4.28 985 -1.20 0.1161
2023-11-15 2023-09-30 13F/A-1 MPLX COM UNIT REP LTD 55336V100 28,035 -200 -0.71 997 4.07 0.1317
2023-11-14 2023-09-30 13F MPLX COM UNIT REP LTD 55336V100 28,235 0 958 0.1221
2023-08-11 2023-06-30 13F MPLX COM UNIT REP LTD 55336V100 28,235 366 1.31 958 -0.21 0.1221
2023-05-12 2023-03-31 13F MPLX COM UNIT REP LTD 55336V100 27,869 -181 -0.65 960 4.23 0.1305
2023-02-13 2022-12-31 13F MPLX COM UNIT REP LTD 55336V100 28,050 -600 -2.09 921 7.09 0.1279
2022-11-14 2022-09-30 13F MPLX COM UNIT REP LTD 55336V100 28,650 -2,000 -6.53 860 -3.70 0.1305
2022-08-12 2022-06-30 13F MPLX COM UNIT REP LTD 55336V100 30,650 -500 -1.61 893 -13.64 0.1377
2022-05-12 2022-03-31 13F MPLX COM UNIT REP LTD 55336V100 31,150 -650 -2.04 1,034 9.88 0.1411
2022-02-08 2021-12-31 13F MPLX COM UNIT REP LTD 55336V100 31,800 -210 -0.66 941 3.29 0.1307
2021-11-12 2021-09-30 13F MPLX COM UNIT REP LTD 55336V100 32,010 0 0.00 911 -3.90 0.1390
2021-08-10 2021-06-30 13F MPLX COM UNIT REP LTD 55336V100 32,010 -1,350 -4.05 948 10.88 0.1428
2021-05-14 2021-03-31 13F MPLX COM UNIT REP LTD 55336V100 33,360 -1,105 -3.21 855 14.61 0.1383
2021-02-16 2020-12-31 13F MPLX COM UNIT REP LTD 55336V100 34,465 300 0.88 746 38.66 0.1392
2020-11-12 2020-09-30 13F MPLX COM UNIT REP LTD 55336V100 34,165 4,250 14.21 538 4.06 0.1118
2020-08-10 2020-06-30 13F MPLX COM UNIT REP LTD 55336V100 29,915 725 2.48 517 52.51 0.1142
2020-05-15 2020-03-31 13F MPLX COM UNIT REP LTD 55336V100 29,190 -940 -3.12 339 -55.80 0.0894
2020-02-07 2019-12-31 13F MPLX COM UNIT REP LTD 55336V100 30,130 30,130 767 0.1592
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.