Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionArizona State Retirement System
Latest Disclosed Ownership82,368 shares
Latest Disclosed Value $ 20,112,618
Arizona State Retirement System reports 3.54% decrease in ownership of MPC / Marathon Petroleum Corporation

On May 1, 2026 - Arizona State Retirement System filed a 13F-HR form disclosing ownership of 82,368 shares of Marathon Petroleum Corporation (MX:MPC) valued at $20,112,618 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 85,395 shares of Marathon Petroleum Corporation. This represents a change in shares of -3.54% 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.

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)
2026-05-01 2026-03-31 13F MARATHON PETE COM 56585A102 82,368 -3,027 -3.54 20,113 44.83 0.1176
2026-01-28 2025-12-31 13F MARATHON PETE COM 56585A102 85,395 -4,318 -4.81 13,888 -19.69 0.0755
2025-11-03 2025-09-30 13F MARATHON PETE COM 56585A102 89,713 -1,362 -1.50 17,291 14.30 0.0922
2025-08-13 2025-06-30 13F MARATHON PETE COM 56585A102 91,075 -3,245 -3.44 15,128 10.09 0.0872
2025-05-01 2025-03-31 13F MARATHON PETE COM 56585A102 94,320 -1,457 -1.52 13,741 2.85 0.0875
2025-02-06 2024-12-31 13F MARATHON PETE COM 56585A102 95,777 -5,245 -5.19 13,361 -18.82 0.0817
2024-11-12 2024-09-30 13F MARATHON PETE COM 56585A102 101,022 -3,442 -3.29 16,457 -9.19 0.1038
2024-08-05 2024-06-30 13F MARATHON PETE COM 56585A102 104,464 -4,497 -4.13 18,122 -17.46 0.1210
2024-05-07 2024-03-31 13F MARATHON PETE COM 56585A102 108,961 -3,532 -3.14 21,956 31.55 0.1519
2024-01-24 2023-12-31 13F MARATHON PETE COM 56585A102 112,493 -7,601 -6.33 16,689 -8.18 0.1267
2023-11-07 2023-09-30 13F MARATHON PETE COM 56585A102 120,094 -6,143 -4.87 18,175 23.48 0.1544
2023-08-01 2023-06-30 13F MARATHON PETE COM 56585A102 126,237 -1,728 -1.35 14,719 -14.69 0.1195
2023-04-27 2023-03-31 13F MARATHON PETROLEUM COM 56585A102 127,965 -7,896 -5.81 17,254 9.11 0.1548
2023-02-08 2022-12-31 13F MARATHON PETROLEUM COM 56585A102 135,861 -11,195 -7.61 15,813 8.25 0.1527
2022-11-07 2022-09-30 13F MARATHON PETE COM 56585A102 147,056 -8,008 -5.16 14,607 14.58 0.1511
2022-07-28 2022-06-30 13F MARATHON PETE COM 56585A102 155,064 -13,853 -8.20 12,748 -11.73 0.1237
2022-05-04 2022-03-31 13F MARATHON PETE COM 56585A102 168,917 -5,874 -3.36 14,442 29.12 0.1163
2022-02-04 2021-12-31 13F MARATHON PETE COM 56585A102 174,791 -7,210 -3.96 11,185 -0.57 0.0852
2021-11-12 2021-09-30 13F MARATHON PETROLEUM COM 56585A102 182,001 -393 -0.22 11,249 2.08 0.0918
2021-08-02 2021-06-30 13F MARATHON PETROLEUM COM 56585A102 182,394 -962 -0.52 11,020 12.36 0.0896
2021-05-06 2021-03-31 13F MARATHON PETROLEUM COM 56585A102 183,356 -27,776 -13.16 9,808 12.32 0.0857
2021-01-28 2020-12-31 13F MARATHON PETROLEUM COM 56585A102 211,132 11,497 5.76 8,732 49.09 0.0792
2020-11-05 2020-09-30 13F MARATHON PETROLEUM COM 56585A102 199,635 47,181 30.95 5,857 2.77 0.0582
2020-08-04 2020-06-30 13F MARATHON PETROLEUM COM 56585A102 152,454 35,706 30.58 5,699 106.64 0.0804
2020-05-05 2020-03-31 13F MARATHON PETROLEUM COM 56585A102 116,748 -5,178 -4.25 2,758 -62.46 0.0474
2020-01-27 2019-12-31 13F MARATHON PETROLEUM COM 56585A102 121,926 -1,000 -0.81 7,346 -1.63 0.0885
2019-10-31 2019-09-30 13F MARATHON PETROLEUM COM 56585A102 122,926 -3,098 -2.46 7,468 6.05 0.0911
2019-07-25 2019-06-30 13F MARATHON PETROLEUM COM 56585A102 126,024 -91,358 -42.03 7,042 -45.87 0.0815
2019-04-29 2019-03-31 13F MARATHON PETROLEUM COM 56585A102 217,382 -12,114 -5.28 13,010 -3.94 0.1547
2019-01-28 2018-12-31 13F MARATHON PETROLEUM COM 56585A102 229,496 45,706 24.87 13,543 -7.86 0.1742
2018-10-29 2018-09-30 13F MARATHON PETROLEUM COM 56585A102 183,790 3,836 2.13 14,698 16.41 0.1387
2018-08-07 2018-06-30 13F MARATHON PETROLEUM COM 56585A102 179,954 -13,746 -7.10 12,626 -10.84 0.1270
2018-05-14 2018-03-31 13F MARATHON PETROLEUM COM 56585A102 193,700 4,000 2.11 14,161 13.14 0.1429
2018-02-09 2017-12-31 13F MARATHON PETROLEUM COM 56585A102 189,700 4,776 2.58 12,516 20.68 0.1219
2017-11-14 2017-09-30 13F MARATHON PETROLEUM COM 56585A102 184,924 15,110 8.90 10,371 16.71 0.1239
2017-08-02 2017-06-30 13F MARATHON PETROLEUM COM 56585A102 169,814 -4,700 -2.69 8,886 0.75 0.1231
2017-05-10 2017-03-31 13F MARATHON PETROLEUM COM 56585A102 174,514 100 0.06 8,820 0.43 0.1239
2017-02-10 2016-12-31 13F MARATHON PETROLEUM COM 56585A102 174,414 3,200 1.87 8,782 26.36 0.1292
2016-11-01 2016-09-30 13F MARATHON PETROLEUM COM 56585A102 171,214 -13,600 -7.36 6,950 -0.94 0.1055
2016-08-15 2016-06-30 13F MARATHON PETROLEUM COM 56585A102 184,814 41,300 28.78 7,016 31.48 0.0985
2016-05-16 2016-03-31 13F MARATHON PETROLEUM COM 56585A102 143,514 200 0.14 5,336 -28.17 0.0694
2016-02-12 2015-12-31 13F MARATHON PETROLEUM COM 56585A102 143,314 -3,400 -2.32 7,429 9.30 0.0989
2015-11-20 2015-09-30 13F MARATHON PETROLEUM COM 56585A102 146,714 68,307 87.12 6,797 -3.96 0.0953
2015-02-11 2014-12-31 13F MARATHON PETROLEUM COM 56585A102 78,407 -500 -0.63 7,077 5.93 0.0834
2014-11-21 2014-09-30 13F MARATHON PETROLEUM COM 56585A102 78,907 -1,400 -1.74 6,681 6.57 0.0829
2014-08-07 2014-06-30 13F MARATHON PETROLEUM COM 56585A102 80,307 -3,700 -4.40 6,269 -14.25 0.0758
2014-05-19 2014-03-31 13F MARATHON PETROLEUM COM 56585A102 84,007 -2,100 -2.44 7,311 -7.43 0.0926
2014-02-05 2013-12-31 13F MARATHON PETROLEUM COM 56585A102 86,107 -5,900 -6.41 7,898 33.48 0.0972
2013-11-01 2013-09-30 13F MARATHON PETROLEUM COM 56585A102 92,007 -5,600 -5.74 5,917 -14.68 0.0758
2013-09-17 2013-06-30 13F MARATHON PETROLEUM COM 56585A102 97,607 -54,104 -35.66 6,935 -48.98 0.0946
2013-09-17 2013-03-31 13F MARATHON PETROLEUM COM 56585A102 151,711 151,711 13,593 0.1947
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.