Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionSwiss National Bank
Latest Disclosed Ownership882,166 shares
Latest Disclosed Value $ 215,407,294
Swiss National Bank reports 5.88% increase in ownership of MPC / Marathon Petroleum Corporation

On May 7, 2026 - Swiss National Bank filed a 13F-HR form disclosing ownership of 882,166 shares of Marathon Petroleum Corporation (MX:MPC) valued at $215,407,294 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 833,166 shares of Marathon Petroleum Corporation. This represents a change in shares of 5.88% during the quarter.

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)
2026-05-07 2026-03-31 13F MARATHON PETE COM 56585A102 882,166 49,000 5.88 215,407 58.98 0.1239
2026-02-12 2025-12-31 13F MARATHON PETE COM 56585A102 833,166 -52,400 -5.92 135,498 -20.61 0.0807
2025-11-13 2025-09-30 13F MARATHON PETE COM 56585A102 885,566 -57,400 -6.09 170,684 8.97 0.0990
2025-08-12 2025-06-30 13F MARATHON PETE COM 56585A102 942,966 36,600 4.04 156,636 18.62 0.0938
2025-05-12 2025-03-31 13F MARATHON PETE COM 56585A102 906,366 -39,100 -4.14 132,048 0.12 0.0933
2025-02-10 2024-12-31 13F MARATHON PETE COM 56585A102 945,466 -100,300 -9.59 131,893 -22.58 0.0877
2024-11-07 2024-09-30 13F MARATHON PETE COM 56585A102 1,045,766 -21,200 -1.99 170,366 -7.96 0.1107
2024-08-08 2024-06-30 13F MARATHON PETE COM 56585A102 1,066,966 -70,000 -6.16 185,097 -19.21 0.1272
2024-05-07 2024-03-31 13F MARATHON PETE COM 56585A102 1,136,966 -113,400 -9.07 229,099 23.50 0.1606
2024-02-06 2023-12-31 13F MARATHON PETE COM 56585A102 1,250,366 -114,500 -8.39 185,504 -10.19 0.1361
2023-11-08 2023-09-30 13F MARATHON PETE COM 56585A102 1,364,866 -230,000 -14.42 206,559 11.08 0.1620
2023-08-09 2023-06-30 13F MARATHON PETE COM 56585A102 1,594,866 -265,100 -14.25 185,961 -25.85 0.1263
2023-05-10 2023-03-31 13F MARATHON PETE COM 56585A102 1,859,966 -166,600 -8.22 250,779 6.32 0.1719
2023-02-08 2022-12-31 13F MARATHON PETE COM 56585A102 2,026,566 -317,970 -13.56 235,872 1.28 0.1694
2022-11-09 2022-09-30 13F MARATHON PETE COM 56585A102 2,344,536 -107,300 -4.38 232,883 15.54 0.1666
2022-08-09 2022-06-30 13F MARATHON PETE COM 56585A102 2,451,836 -214,400 -8.04 201,565 -11.58 0.1364
2022-05-09 2022-03-31 13F MARATHON PETE COM 56585A102 2,666,236 240,500 9.91 227,963 46.86 0.1285
2022-02-08 2021-12-31 13F MARATHON PETE COM 56585A102 2,425,736 -157,300 -6.09 155,223 -2.78 0.0934
2021-11-08 2021-09-30 13F MARATHON PETE COM 56585A102 2,583,036 -71,500 -2.69 159,657 -0.46 0.1015
2021-08-06 2021-06-30 13F MARATHON PETE COM 56585A102 2,654,536 153,525 6.14 160,387 19.89 0.0989
2021-05-07 2021-03-31 13F MARATHON PETE COM 56585A102 2,501,011 41,700 1.70 133,779 31.52 0.0892
2021-02-05 2020-12-31 13F MARATHON PETE COM 56585A102 2,459,311 -71,800 -2.84 101,717 36.97 0.0723
2020-11-09 2020-09-30 13F MARATHON PETE COM 56585A102 2,531,111 -35,400 -1.38 74,263 -22.59 0.0581
2020-08-05 2020-06-30 13F MARATHON PETE COM 56585A102 2,566,511 46,300 1.84 95,936 61.16 0.0811
2020-05-08 2020-03-31 13F MARATHON PETE COM 56585A102 2,520,211 444,400 21.41 59,527 -52.40 0.0632
2020-02-06 2019-12-31 13F MARATHON PETE COM 56585A102 2,075,811 -112,700 -5.15 125,068 -5.93 0.1283
2019-11-12 2019-09-30 13F MARATHON PETE COM 56585A102 2,188,511 -7,471 -0.34 132,952 8.35 0.1413
2019-08-02 2019-06-30 13F MARATHON PETE COM 56585A102 2,195,982 -110,000 -4.77 122,711 -11.09 0.1324
2019-05-10 2019-03-31 13F MARATHON PETE COM 56585A102 2,305,982 60,400 2.69 138,013 4.15 0.1514
2019-02-13 2018-12-31 13F MARATHON PETE COM 56585A102 2,245,582 771,186 52.31 132,512 12.39 0.1700
2018-11-08 2018-09-30 13F MARATHON PETE COM 56585A102 1,474,396 -98,700 -6.27 117,907 6.83 0.1313
2018-08-09 2018-06-30 13F MARATHON PETE COM 56585A102 1,573,096 6,100 0.39 110,368 -3.66 0.1262
2018-05-04 2018-03-31 13F MARATHON PETE COM 56585A102 1,566,996 -300,700 -16.10 114,563 -7.03 0.1397
2018-02-07 2017-12-31 13F MARATHON PETE COM 56585A102 1,867,696 -51,300 -2.67 123,231 14.51 0.1331
2017-11-03 2017-09-30 13F MARATHON PETE COM 56585A102 1,918,996 -8,300 -0.43 107,617 6.70 0.1226
2017-08-09 2017-06-30 13F MARATHON PETE COM 56585A102 1,927,296 57,100 3.05 100,855 6.70 0.1196
2017-05-04 2017-03-31 13F MARATHON PETE COM 56585A102 1,870,196 397,500 26.99 94,520 27.47 0.1176
2017-02-08 2016-12-31 13F MARATHON PETE COM 56585A102 1,472,696 4,500 0.31 74,150 24.43 0.1169
2016-11-07 2016-09-30 13F MARATHON PETE COM 56585A102 1,468,196 -15,300 -1.03 59,594 5.82 0.0955
2016-08-03 2016-06-30 13F MARATHON PETE COM 56585A102 1,483,496 98,900 7.14 56,314 14.14 0.0911
2016-05-04 2016-03-31 13F MARATHON PETE COM 56585A102 1,384,596 410,900 42.20 49,338 -2.25 0.0905
2016-02-03 2015-12-31 13F MARATHON PETE COM 56585A102 973,696 4,200 0.43 50,476 12.38 0.1221
2015-11-04 2015-09-30 13F MARATHON PETE COM 56585A102 969,496 88,400 10.03 44,917 -2.55 0.1153
2015-08-05 2015-06-30 13F MARATHON PETE COM 56585A102 881,096 454,248 106.42 46,090 5.46 0.1195
2015-05-06 2015-03-31 13F MARATHON PETE COM 56585A102 426,848 426,848 0.00 43,705 0.1167
2015-02-03 2014-12-31 13F MARATHON PETE COM 56585A102 0 -278,548 -100.00 0 -100.00
2014-11-04 2014-09-30 13F MARATHON PETE COM 56585A102 278,548 -8,600 -2.99 23,585 5.21 0.0904
2014-08-06 2014-06-30 13F MARATHON PETE COM 56585A102 287,148 -4,700 -1.61 22,418 -11.75 0.0829
2014-05-06 2014-03-31 13F MARATHON PETE COM 56585A102 291,848 -41,800 -12.53 25,402 -17.00 0.0997
2014-01-31 2013-12-31 13F MARATHON PETE COM 56585A102 333,648 -18,100 -5.15 30,606 35.28 0.1194
2013-10-29 2013-09-30 13F MARATHON PETE COM 56585A102 351,748 -400 -0.11 22,624 -9.59 0.0943
2013-08-09 2013-06-30 13F MARATHON PETE COM 56585A102 352,148 352,148 25,024 0.1099
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.