Marathon Petroleum Corporation
US ˙ NYSE ˙ US56585A1025

SecurityMPC / Marathon Petroleum Corporation
InstitutionWetherby Asset Management Inc
Latest Disclosed Ownership15,040 shares
Latest Disclosed Value $ 2,898,811
Wetherby Asset Management Inc reports 3.05% increase in ownership of MPC / Marathon Petroleum Corporation

On November 14, 2025 - Wetherby Asset Management Inc filed a 13F-HR form disclosing ownership of 15,040 shares of Marathon Petroleum Corporation (US:MPC) valued at $2,898,810 USD as of September 30, 2025. The entity filed a previous 13F-HR on August 14, 2025 disclosing 14,595 shares of Marathon Petroleum Corporation. This represents a change in shares of 3.05% during the quarter. The current value of the position is $4,018,838 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)
2025-11-14 2025-09-30 13F MARATHON PETE COM 56585A102 15,040 445 3.05 2,899 19.55 0.1183
2025-08-14 2025-06-30 13F MARATHON PETE COM 56585A102 14,595 703 5.06 2,424 25.14 0.1079
2025-02-14 2024-12-31 13F MARATHON PETE COM 56585A102 13,892 -2,372 -14.58 1,938 -26.88 0.0929
2024-11-14 2024-09-30 13F MARATHON PETE COM 56585A102 16,264 -334 -2.01 2,650 -7.99 0.1211
2024-08-14 2024-06-30 13F MARATHON PETE COM 56585A102 16,598 808 5.12 2,879 -9.49 0.1357
2024-05-15 2024-03-31 13F MARATHON PETE COM 56585A102 15,790 -1,111 -6.57 3,182 26.88 0.1516
2024-02-14 2023-12-31 13F MARATHON PETE COM 56585A102 16,901 -399 -2.31 2,507 -4.24 0.1306
2023-11-14 2023-09-30 13F MARATHON PETE COM 56585A102 17,300 1,109 6.85 2,618 38.74 0.1485
2023-08-14 2023-06-30 13F MARATHON PETE COM 56585A102 16,191 -893 -5.23 1,888 -18.06 0.1017
2023-05-12 2023-03-31 13F MARATHON PETE COM 56585A102 17,084 332 1.98 2,303 18.16 0.1348
2023-02-14 2022-12-31 13F MARATHON PETE COM 56585A102 16,752 268 1.63 1,950 19.06 0.1252
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 16,484 3,054 22.74 1,637 48.28 0.1154
2022-08-15 2022-06-30 13F MARATHON PETE COM 56585A102 13,430 2,370 21.43 1,104 16.70 0.0754
2022-05-16 2022-03-31 13F MARATHON PETE COM 56585A102 11,060 519 4.92 946 40.15 0.0542
2022-02-14 2021-12-31 13F MARATHON PETE COM 56585A102 10,541 477 4.74 675 8.52 0.0379
2021-11-15 2021-09-30 13F MARATHON PETE COM 56585A102 10,064 448 4.66 622 7.06 0.0384
2021-08-16 2021-06-30 13F MARATHON PETE COM 56585A102 9,616 1,155 13.65 581 28.26 0.0354
2021-05-14 2021-03-31 13F MARATHON PETE COM 56585A102 8,461 39 0.46 453 30.17 0.0345
2021-02-11 2020-12-31 13F MARATHON PETE COM 56585A102 8,422 8,122 2,707.33 348 3,766.67 0.0236
2020-12-16 2020-09-30 13F/A-01 MARATHON PETE COM 56585A102 8,317 -1,773 244 0.0224
2020-12-16 2020-09-30 13F/A-02 MARATHON PETE COM 56585A102 300 -9,790 -97.03 9 -97.61 0.0270
2020-11-13 2020-09-30 13F MARATHON PETE COM 56585A102 8,765 -1,325 257 16,347.4566
2020-08-14 2020-06-30 13F MARATHON PETE COM 56585A102 10,090 1,264 14.32 377 81.25 0.0357
2020-05-06 2020-03-31 13F MARATHON PETE COM 56585A102 8,826 -6,495 -42.39 208 -77.46 0.0233
2020-01-28 2019-12-31 13F MARATHON PETE COM 56585A102 15,321 -6,076 -28.40 923 -28.95 0.0909
2019-10-31 2019-09-30 13F MARATHON PETE COM 56585A102 21,397 614 2.95 1,299 11.79 0.1356
2019-07-25 2019-06-30 13F MARATHON PETE COM 56585A102 20,783 2,903 16.24 1,162 8.60 0.1272
2019-07-25 2019-03-31 13F/A-1 MARATHON PETE COM 56585A102 17,880 -2,450 -12.05 1,070 -10.83 0.1332
2019-05-09 2019-03-31 13F MARATHON PETE COM 56585A102 17,880 -2,450 1,070
2019-01-30 2018-12-31 13F MARATHON PETE COM 56585A102 20,330 8,442 71.01 1,200 26.32 0.1697
2018-11-07 2018-09-30 13F MARATHON PETE COM 56585A102 11,888 2,703 29.43 950 47.52 0.1173
2018-07-24 2018-06-30 13F MARATHON PETE COM 56585A102 9,185 -290 -3.06 644 -7.07 0.0872
2018-05-04 2018-03-31 13F MARATHON PETE COM 56585A102 9,475 84 0.89 693 11.77 0.0957
2018-02-09 2017-12-31 13F MARATHON PETE COM 56585A102 9,391 452 5.06 620 23.51 0.0860
2017-11-13 2017-09-30 13F MARATHON PETE COM 56585A102 8,939 178 2.03 502 9.37 0.0747
2017-08-01 2017-06-30 13F MARATHON PETE COM 56585A102 8,761 7 0.08 459 3.85 0.0781
2017-04-27 2017-03-31 13F MARATHON PETE COM 56585A102 8,754 441 5.30 442 5.74 0.0795
2017-02-08 2016-12-31 13F MARATHON PETE COM 56585A102 8,313 357 4.49 418 29.41 0.0819
2016-11-14 2016-09-30 13F MARATHON PETE COM 56585A102 7,956 1,916 31.72 323 41.05 0.0653
2016-08-10 2016-06-30 13F MARATHON PETE COM 56585A102 6,040 43 0.72 229 2.69 0.0508
2016-05-10 2016-03-31 13F MARATHON PETE COM 56585A102 5,997 -1,694 -22.03 223 -44.11 0.0526
2016-02-08 2015-12-31 13F MARATHON PETE COM 56585A102 7,691 233 3.12 399 15.32 0.0957
2015-11-12 2015-09-30 13F MARATHON PETE COM 56585A102 7,458 -500 -6.28 346 -17.03 0.0886
2015-08-12 2015-06-30 13F MARATHON PETE COM 56585A102 7,958 4,238 113.92 417 9.45 0.1002
2015-05-08 2015-03-31 13F MARATHON PETE COM 56585A102 3,720 151 4.23 381 18.32 0.0928
2015-02-12 2014-12-31 13F MARATHON PETE COM 56585A102 3,569 367 11.46 322 18.82 0.0810
2014-11-03 2014-09-30 13F MARATHON PETE COM 56585A102 3,202 -35 -1.08 271 7.11 0.0756
2014-08-01 2014-06-30 13F MARATHON PETE COM 56585A102 3,237 -170 -4.99 253 -14.81 0.0714
2014-05-05 2014-03-31 13F/A-1 MARATHON PETE COM 56585A102 3,407 -200 -5.54 297 -10.00 0.0851
2014-04-30 2014-03-31 13F MARATHON PETE COM 56585A102 3,407 297
2014-01-29 2013-12-31 13F MARATHON PETE COM 56585A102 3,607 -82 -2.22 330 38.66 0.0941
2013-10-29 2013-09-30 13F MARATHON PETE COM 56585A102 3,689 132 3.71 238 -5.56 0.0743
2013-07-24 2013-06-30 13F MARATHON PETE COM 56585A102 3,557 3,557 252 0.0878
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.