Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionSchroder Investment Management Group
Latest Disclosed Ownership63,193 shares
Latest Disclosed Value $ 15,492,395
Schroder Investment Management Group reports 27.56% decrease in ownership of MPC / Marathon Petroleum Corporation

On May 14, 2026 - Schroder Investment Management Group filed a 13F-HR form disclosing ownership of 63,193 shares of Marathon Petroleum Corporation (MX:MPC) valued at $15,492,395 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 87,237 shares of Marathon Petroleum Corporation. This represents a change in shares of -27.56% 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)
2026-05-14 2026-03-31 13F MARATHON PETE COM 56585A102 63,193 -24,044 -27.56 15,492 8.40 0.0127
2026-02-13 2025-12-31 13F MARATHON PETE COM 56585A102 87,237 -4,556 -4.96 14,291 -19.22 0.0108
2025-11-13 2025-09-30 13F MARATHON PETE COM 56585A102 91,793 44,916 95.82 17,692 127.23 0.0138
2025-08-13 2025-06-30 13F MARATHON PETE COM 56585A102 46,877 -12,955 -21.65 7,787 -9.69 0.0066
2025-05-13 2025-03-31 13F MARATHON PETE COM 56585A102 59,832 -15,668 -20.75 8,622 -15.79 0.0087
2025-02-12 2024-12-31 13F MARATHON PETE COM 56585A102 75,500 -343,103 -81.96 10,238 -85.06 0.0098
2024-11-13 2024-09-30 13F MARATHON PETE COM 56585A102 418,603 -88,443 -17.44 68,504 -22.12 0.0702
2024-08-12 2024-06-30 13F MARATHON PETE COM 56585A102 507,046 -64,929 -11.35 87,962 -23.68 0.0970
2024-05-14 2024-03-31 13F MARATHON PETE COM 56585A102 571,975 -71,615 -11.13 115,253 20.70 0.1356
2024-02-14 2023-12-31 13F MARATHON PETE COM 56585A102 643,590 486,573 309.89 95,483 301.83 0.1238
2023-11-14 2023-09-30 13F MARATHON PETE COM 56585A102 157,017 11,797 8.12 23,763 40.34 0.0354
2023-08-11 2023-06-30 13F MARATHON PETE COM 56585A102 145,220 -20,088 -12.15 16,933 -24.03 0.0243
2023-05-11 2023-03-31 13F MARATHON PETE COM 56585A102 165,308 -11,828 -6.68 22,288 8.11 0.0332
2023-02-10 2022-12-31 13F MARATHON PETE COM 56585A102 177,136 77,075 77.03 20,617 107.43 0.0327
2022-11-14 2022-09-30 13F MARATHON PETE COM 56585A102 100,061 12,966 14.89 9,939 35.10 0.0164
2022-08-11 2022-06-30 13F MARATHON PETE COM 56585A102 87,095 18,682 27.31 7,357 26.00 0.0112
2022-05-16 2022-03-31 13F MARATHON PETE COM 56585A102 68,413 6,354 10.24 5,839 47.04 0.0077
2022-02-14 2021-12-31 13F Marathon Petroleum COM 56585A102 62,059 -24,726 -28.49 3,971 -25.97 0.0052
2021-11-12 2021-09-30 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 86,785 16,789 23.99 5,364 26.84 0.0082
2021-08-13 2021-06-30 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 69,996 2,190 3.23 4,229 16.63 0.0053
2021-05-28 2021-03-31 13F/A-1 MARATHON PETROLEUM CORPORATION NPV COM 56585A102 67,806 26,785 65.30 3,626 362,500.00 0.0047
2021-05-17 2021-03-31 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 67,806 26,785 3,626 0.0047
2021-02-24 2020-12-31 13F/A-1 MARATHON PETROLEUM CORPORATION NPV COM 56585A102 41,021 2,654 6.92 2 -99.91 0.0024
2021-02-16 2020-12-31 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 41,021 2,654 2 0.0024
2020-11-13 2020-09-30 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 38,367 90 0.24 1,085 -24.13 0.0017
2020-08-13 2020-06-30 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 38,277 -26,787 -41.17 1,430 -4.86 0.0026
2020-05-15 2020-03-31 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 65,064 -36,259 -35.79 1,503 -75.38 0.0032
2020-02-11 2019-12-31 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 101,323 -121,790 -54.59 6,104 -56.17 0.0099
2019-11-12 2019-09-30 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 223,113 -286,482 -56.22 13,927 -51.09 0.0246
2019-11-14 2019-06-30 13F/A-2 MARATHON PETROLEUM CORPORATION NPV COM 56585A102 509,595 -221,130 -30.26 28,476 -34.89 0.0518
2019-08-15 2019-06-30 13F/A-1 MARATHON PETROLEUM CORPORATION NPV COM 56585A102 509,595 0 28,476 0.0305
2019-08-08 2019-06-30 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 509,595 -221,130 28,476 30,550.5209
2019-11-15 2019-03-31 13F/A-1 MARATHON PETROLEUM CORPORATION NPV COM 56585A102 730,725 -86,024 -10.53 43,734 -9.26 0.0779
2019-05-14 2019-03-31 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 730,725 -86,024 43,734 71,033.0193
2019-02-14 2018-12-31 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 816,749 778,374 2,028.34 48,196 1,470.41 0.0872
2018-11-13 2018-09-30 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 38,375 -45,204 -54.09 3,069 -47.16 0.0053
2018-08-23 2018-06-30 13F/A-2 MARATHON PETROLEUM CORPORATION NPV COM 56585A102 83,579 -133,374 -61.48 5,808 -63.38 0.0102
2018-08-16 2018-06-30 13F/A-1 MARATHON PETROLEUM CORPORATION NPV COM 56585A102 83,579 0 5,808 0.0102
2018-08-13 2018-06-30 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 83,579 -133,374 5,808 10,284.3417
2018-05-11 2018-03-31 13F/A-1 MARATHON PETROLEUM CORPORATION NPV COM 56585A102 216,953 130,932 152.21 15,862 179.46 0.0275
2018-05-11 2018-03-31 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 216,953 130,932 15,862 27,487.5515
2018-02-09 2017-12-31 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 86,021 -307,613 -78.15 5,676 -74.01 0.0093
2017-11-09 2017-09-30 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 393,634 -19,333 -4.68 21,835 2.05 0.0379
2017-08-10 2017-06-30 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 412,967 -205,172 -33.19 21,396 -30.97 0.0386
2017-05-18 2017-03-31 13F/A-1 MARATHON PETROLEUM CORPORATION NPV COM 56585A102 618,139 -203,528 -24.77 30,993 -25.09 0.0557
2017-05-10 2017-03-31 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 618,139 -203,528 30,993 55,709.7276
2017-02-10 2016-12-31 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 821,667 -621,106 -43.05 41,371 -29.36 0.0792
2016-11-09 2016-09-30 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 1,442,773 953,650 194.97 58,562 215.41 0.1094
2016-08-08 2016-06-30 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 489,123 -2,839,141 -85.30 18,567 -84.75 0.0373
2016-05-10 2016-03-31 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 3,328,264 716,433 27.43 121,748 -10.08 0.2517
2016-02-10 2015-12-31 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 2,611,831 249,790 10.58 135,398 23.73 0.2793
2015-11-13 2015-09-30 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 2,362,041 915,550 63.29 109,434 48.78 0.2314
2015-08-10 2015-06-30 13F MARATHON PETROLEUM CORPORATION NPV COM 56585A102 1,446,491 915,006 172.16 73,554 38.88 0.1446
2015-05-12 2015-03-31 13F MARATHON PETROLEUM CORPORATION USD0.01 COM 56585A102 531,485 -66,054 -11.05 52,963 -1.80 0.1035
2015-02-18 2014-12-31 13F/A-1 MARATHON PETROLEUM CORPORATION USD0.01 COM 56585A102 597,539 160,445 53,934 0.1058
2015-02-25 2014-12-31 13F/A-2 MARATHON PETROLEUM CORPORATION USD0.01 COM 56585A102 597,539 160,445 36.71 53,934 45.74 0.1059
2015-02-17 2014-12-31 13F MARATHON PETROLEUM CORPORATION USD0.01 COM 56585A102 597,539 160,445 53,934 78,314.2278
2014-11-13 2014-09-30 13F Marathon Petroleum CS USD0.01 COM 56585A102 437,094 -105,100 -19.38 37,009 -12.57 0.0494
2014-08-13 2014-06-30 13F Marathon Petroleum CS USD0 01 COM 56585A102 542,194 -178,390 -24.76 42,329 -32.51 0.0526
2014-05-15 2014-03-31 13F Marathon Petroleum CS USD0.01 COM 56585A102 720,584 -69,802 -8.83 62,720 -13.49 0.0707
2014-02-14 2013-12-31 13F Marathon Petroleum CS USD0.01 COM 56585A102 790,386 -406,300 -33.95 72,502 -5.80 0.0906
2013-12-09 2013-09-30 13F/A-1 Marathon Petroleum CS USD0.01 COM 56585A102 76,970,844 75,902,528 4,950,765 0.1492
2013-12-10 2013-09-30 13F/A-2 Marathon Petroleum CS USD0.01 COM 56585A102 1,196,686 128,370 12.02 76,971 1.39 0.1869
2013-11-08 2013-09-30 13F Marathon Petroleum CS USD0.01 COM 56585A102 1,196,686 128,370 76,971 189.9362
2013-08-12 2013-06-30 13F Marathon Petroleum CS USD0.01 COM 56585A102 1,068,316 1,068,316 75,915 0.2008
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.