MPLX LP - Limited Partnership
US ˙ NYSE ˙ US55336V1008

SecurityMPLX / MPLX LP - Limited Partnership
InstitutionSignaturefd, Llc
Latest Disclosed Ownership8,000 shares
Latest Disclosed Value $ 456,560
Signaturefd, Llc ownership in MPLX / MPLX LP - Limited Partnership

On April 7, 2026 - Signaturefd, Llc filed a 13F-HR form disclosing ownership of 8,000 shares of MPLX LP - Limited Partnership (US:MPLX) valued at $456,560 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 20, 2026 disclosing 8,000 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 $451,840 USD.

Signaturefd, Llc has a history of taking positions in derivatives of the underlying security (MPLX) in the form of stock options.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MPLX / MPLX LP - Limited Partnership Historical Put/Call Ratio
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)
2026-04-07 2026-03-31 13F MPLX COM UNIT REP LTD 55336V100 8,000 0 0.00 457 7.04 0.0070
2026-01-20 2025-12-31 13F MPLX COM UNIT REP LTD 55336V100 8,000 0 0.00 427 6.77 0.0065
2025-10-21 2025-09-30 13F MPLX COM UNIT REP LTD 55336V100 8,000 0 0.00 400 -3.16 0.0063
2025-07-16 2025-06-30 13F MPLX COM UNIT REP LTD 55336V100 8,000 0 0.00 412 -3.74 0.0070
2025-05-02 2025-03-31 13F MPLX COM UNIT REP LTD 55336V100 8,000 4,999 166.58 428 199.30 0.0081
2025-02-10 2024-12-31 13F MPLX COM UNIT REP LTD 55336V100 3,001 0 0.00 144 7.52 0.0027
2024-10-21 2024-09-30 13F MPLX COM UNIT REP LTD 55336V100 3,001 0 0.00 133 4.72 0.0025
2024-07-29 2024-06-30 13F MPLX COM UNIT REP LTD 55336V100 3,001 0 0.00 128 2.42 0.0026
2024-05-03 2024-03-31 13F MPLX COM UNIT REP LTD 55336V100 3,001 -1,631 -35.21 125 -27.06 0.0026
2024-02-01 2023-12-31 13F MPLX COM UNIT REP LTD 55336V100 4,632 1,605 53.02 170 58.88 0.0039
2023-11-03 2023-09-30 13F MPLX COM UNIT REP LTD 55336V100 3,027 0 0.00 108 4.90 0.0028
2023-08-01 2023-06-30 13F MPLX COM UNIT REP LTD 55336V100 3,027 27 0.90 103 -0.97 0.0026
2023-04-28 2023-03-31 13F MPLX COM UNIT REP LTD 55336V100 3,000 -750 -20.00 103 -16.26 0.0028
2023-01-30 2022-12-31 13F MPLX COM UNIT REP LTD 55336V100 3,750 0 0.00 123 8.85 0.0036
2022-11-08 2022-09-30 13F MPLX COM UNIT REP LTD 55336V100 3,750 750 25.00 113 29.89 0.0039
2022-08-10 2022-06-30 13F MPLX COM UNIT REP LTD 55336V100 3,000 500 20.00 87 4.82 0.0030
2022-05-02 2022-03-31 13F MPLX COM UNIT REP LTD 55336V100 2,500 -8,625 -77.53 83 -74.77 0.0025
2022-01-25 2021-12-31 13F MPLX COM UNIT REP LTD 55336V100 11,125 -1,170 -9.52 329 -6.00 0.0101
2021-10-28 2021-09-30 13F MPLX COM UNIT REP LTD 55336V100 12,295 0 0.00 350 -3.85 0.0121
2021-07-26 2021-06-30 13F MPLX COM UNIT REP LTD 55336V100 12,295 2,070 20.24 364 38.93 0.0145
2021-04-30 2021-03-31 13F MPLX COM UNIT REP LTD 55336V100 10,225 525 5.41 262 24.76 0.0116
2021-02-11 2020-12-31 13F MPLX COM UNIT REP LTD 55336V100 9,700 2,050 26.80 210 75.00 0.0099
2020-11-03 2020-09-30 13F MPLX COM UNIT REP LTD 55336V100 7,650 600 8.51 120 -1.64 0.0064
2020-07-30 2020-06-30 13F MPLX COM UNIT REP LTD 55336V100 7,050 900 14.63 122 71.83 0.0074
2020-04-23 2020-03-31 13F MPLX COM UNIT REP LTD 55336V100 6,150 1,050 20.59 71 -45.38 0.0061
2020-02-05 2019-12-31 13F MPLX COM UNIT REP LTD 55336V100 5,100 -1,625 -24.16 130 -30.85 0.0096
2019-10-16 2019-09-30 13F MPLX COM UNIT REP LTD 55336V100 6,725 2,525 60.12 188 39.26 0.0154
2019-07-31 2019-06-30 13F MPLX COM UNIT REP LTD 55336V100 4,200 -1,500 -26.32 135 -27.81 0.0117
2019-05-09 2019-03-31 13F MPLX COM UNIT REP LTD 55336V100 5,700 -750 -11.63 187 -4.10 0.0159
2019-02-13 2018-12-31 13F MPLX COM UNIT REP LTD 55336V100 6,450 -12,020 -65.08 195 -69.58 0.0182
2018-11-14 2018-09-30 13F MPLX COM UNIT REP LTD 55336V100 18,470 9,850 114.27 641 118.03 0.0651
2018-08-14 2018-06-30 13F MPLX COM UNIT REP LTD 55336V100 8,620 1,200 16.17 294 20.00 0.0328
2018-05-08 2018-03-31 13F MPLX COM UNIT REP LTD 55336V100 7,420 100 1.37 245 -5.77 0.0287
2018-02-13 2017-12-31 13F MPLX COM UNIT REP LTD 55336V100 7,320 0 0.00 260 1.56 0.0313
2017-11-14 2017-09-30 13F MPLX COM UNIT REP LTD 55336V100 7,320 425 6.16 256 11.30 0.0340
2017-08-14 2017-06-30 13F MPLX COM UNIT REP LTD 55336V100 6,895 0 0.00 230 -7.63 0.0334
2017-05-15 2017-03-31 13F MPLX COM UNIT REP LTD 55336V100 6,895 270 4.08 249 8.73 0.0369
2017-02-14 2016-12-31 13F MPLX COM UNIT REP LTD 55336V100 6,625 0 0.00 229 2.23 0.0385
2016-11-14 2016-09-30 13F MPLX COM UNIT REP LTD 55336V100 6,625 -250 -3.64 224 -3.03 0.0327
2016-07-29 2016-06-30 13F MPLX COM UNIT REP LTD 55336V100 6,875 100 1.48 231 14.93 0.0337
2016-05-12 2016-03-31 13F MPLX COM UNIT REP LTD 55336V100 6,775 6,263 1,223.24 201 905.00 0.0343
2016-01-22 2015-12-31 13F MPLX COM UNIT REP LTD 55336V100 512 512 20 0.0039
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-04-07 2026-03-31 13F MPLX COM UNIT REP LTD Put 5,000 0.00 17 325.00 n/a n/a n/a
2026-01-20 2025-12-31 13F MPLX COM UNIT REP LTD Put 5,000 0.00 4 -55.56 n/a n/a n/a
2025-10-21 2025-09-30 13F MPLX COM UNIT REP LTD Put 5,000 0.00 10 -30.77 n/a n/a n/a
2025-07-16 2025-06-30 13F MPLX COM UNIT REP LTD Put 5,000 0.00 14 18.18 n/a n/a n/a
2025-05-02 2025-03-31 13F MPLX COM UNIT REP LTD Put 5,000 12 n/a n/a n/a
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.