Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
InstitutionRhumbline Advisers
Latest Disclosed Ownership618,835 shares
Latest Disclosed Value $ 151,107,013
Rhumbline Advisers reports 4.64% decrease in ownership of MPC / Marathon Petroleum Corporation

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 618,835 shares of Marathon Petroleum Corporation (MX:MPC) valued at $151,107,013 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 648,955 shares of Marathon Petroleum Corporation. This represents a change in shares of -4.64% 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)
2026-05-12 2026-03-31 13F MARATHON PETE CORP COM COM 56585A102 618,835 -30,120 -4.64 151,107 43.18 0.1293
2026-02-13 2025-12-31 13F MARATHON PETE CORP COM COM 56585A102 648,955 -20,282 -3.03 105,539 -18.18 0.0853
2025-11-06 2025-09-30 13F MARATHON PETE CORP COM COM 56585A102 669,237 11,948 1.82 128,989 18.14 0.1036
2025-08-12 2025-06-30 13F MARATHON PETE CORP COM COM 56585A102 657,289 -11,806 -1.76 109,182 12.00 0.0935
2025-05-29 2025-03-31 13F/A-1 MARATHON PETE CORP COM COM 56585A102 669,095 2,740 0.41 97,480 4.87 0.0912
2025-04-08 2025-03-31 13F MARATHON PETE CORP COM COM 56585A102 669,095 2,740 97,480 0.0912
2025-05-29 2024-12-31 13F/A-1 MARATHON PETE CORP COM COM 56585A102 666,355 -27,933 -4.02 92,956 -17.82 0.0832
2025-01-30 2024-12-31 13F MARATHON PETE CORP COM COM 56585A102 666,355 -27,933 92,956 0.0832
2024-11-12 2024-09-30 13F MARATHON PETE CORP COM COM 56585A102 694,288 -93,696 -11.89 113,106 -17.26 0.1020
2024-08-01 2024-06-30 13F MARATHON PETE CORP COM COM 56585A102 787,984 -3,569 -0.45 136,699 -14.29 0.1285
2024-05-09 2024-03-31 13F MARATHON PETE CORP COM COM 56585A102 791,553 -4,356 -0.55 159,498 35.08 0.1532
2024-02-08 2023-12-31 13F MARATHON PETE CORP COM COM 56585A102 795,909 -60,000 -7.01 118,081 -8.84 0.1238
2023-11-09 2023-09-30 13F MARATHON PETE CORP COM COM 56585A102 855,909 -41,341 -4.61 129,533 23.81 0.1504
2023-08-08 2023-06-30 13F MARATHON PETE CORP COM COM 56585A102 897,250 -43,962 -4.67 104,619 82,930.95 0.1172
2023-05-11 2023-03-31 13F MARATHON PETE CORP COM COM 56585A102 941,212 -14,420 -1.51 127 -99.89 0.1566
2023-02-14 2022-12-31 13F MARATHON PETE CORP COM COM 56585A102 955,632 -28,693 -2.91 111,226 13.76 0.1495
2022-11-10 2022-09-30 13F MARATHON PETE CORP COM COM 56585A102 984,325 -29,539 -2.91 97,773 17.30 0.1456
2022-08-11 2022-06-30 13F MARATHON PETE CORP COM COM 56585A102 1,013,864 1,545 0.15 83,350 -3.70 0.1216
2022-05-12 2022-03-31 13F MARATHON PETE CORP COM COM 56585A102 1,012,319 11,959 1.20 86,553 35.21 0.1114
2022-02-10 2021-12-31 13F MARATHON PETE CORP COM COM 56585A102 1,000,360 -16,444 -1.62 64,013 1.85 0.0785
2021-11-12 2021-09-30 13F MARATHON PETE CORP COM COM 56585A102 1,016,804 -49,771 -4.67 62,849 -2.47 0.0851
2021-08-05 2021-06-30 13F MARATHON PETE CORP COM COM 56585A102 1,066,575 -36,051 -3.27 64,442 9.26 0.0846
2021-05-06 2021-03-31 13F MARATHON PETE CORP COM COM 56585A102 1,102,626 -71,744 -6.11 58,979 21.43 0.0801
2021-02-10 2020-12-31 13F MARATHON PETE CORP COM COM 56585A102 1,174,370 10,344 0.89 48,572 42.22 0.0670
2020-11-12 2020-09-30 13F MARATHON PETE CORP COM COM 56585A102 1,164,026 59,615 5.40 34,153 -17.27 0.0535
2020-08-13 2020-06-30 13F MARATHON PETE CORP COM COM 56585A102 1,104,411 -68,906 -5.87 41,283 48.96 0.0689
2020-05-06 2020-03-31 13F MARATHON PETE CORP COM COM 56585A102 1,173,317 6,797 0.58 27,714 -60.57 0.0581
2020-02-05 2019-12-31 13F MARATHON PETE CORP COM COM 56585A102 1,166,520 12,198 1.06 70,283 0.23 0.1175
2019-10-23 2019-09-30 13F MARATHON PETE CORP COM COM 56585A102 1,154,322 4,276 0.37 70,125 9.12 0.1281
2019-08-14 2019-06-30 13F MARATHON PETE CORP COM COM 56585A102 1,150,046 -78,499 -6.39 64,265 -12.60 0.1206
2019-05-01 2019-03-31 13F MARATHON PETE CORP COM COM 56585A102 1,228,545 -25,499 -2.03 73,528 -0.64 0.1424
2019-01-31 2018-12-31 13F MARATHON PETE CORP COM COM 56585A102 1,254,044 423,031 50.91 74,001 11.35 0.1610
2018-11-07 2018-09-30 13F MARATHON PETE CORP COM COM 56585A102 831,013 -29,211 -3.40 66,456 10.11 0.1284
2018-08-06 2018-06-30 13F MARATHON PETE CORP COM COM 56585A102 860,224 -28,272 -3.18 60,353 -7.09 0.1217
2018-05-02 2018-03-31 13F MARATHON PETE CORP COM COM 56585A102 888,496 -17,466 -1.93 64,958 8.67 0.1357
2018-02-09 2017-12-31 13F MARATHON PETE CORP COM COM 56585A102 905,962 -14,209 -1.54 59,775 15.84 0.1214
2017-11-06 2017-09-30 13F MARATHON PETE CORP COM COM 56585A102 920,171 -6,622 -0.71 51,603 6.40 0.1122
2017-08-02 2017-06-30 13F MARATHON PETE CORP COM COM 56585A102 926,793 3,896 0.42 48,499 3.98 0.1107
2017-05-02 2017-03-31 13F MARATHON PETE CORP COM COM 56585A102 922,897 27,848 3.11 46,643 3.50 0.1090
2017-01-27 2016-12-31 13F MARATHON PETE CORP COM COM 56585A102 895,049 74,350 9.06 45,066 35.28 0.1142
2016-11-08 2016-09-30 13F MARATHON PETE CORP COM COM 56585A102 820,699 33,555 4.26 33,312 11.49 0.0918
2016-08-11 2016-06-30 13F MARATHON PETE CORP COM COM 56585A102 787,144 -4,198 -0.53 29,880 1.56 0.0885
2016-05-02 2016-03-31 13F MARATHON PETROLEUM CORP COMMON COM 56585A102 791,342 29,040 3.81 29,422 -25.55 0.0913
2016-02-03 2015-12-31 13F MARATHON PETROLEUM CORP COMMON COM 56585A102 762,302 12,847 1.71 39,518 13.81 0.1272
2015-11-04 2015-09-30 13F MARATHON PETROLEUM CORP COMMON COM 56585A102 749,455 3,337 0.45 34,722 -11.04 0.1181
2015-08-04 2015-06-30 13F MARATHON PETROLEUM CORP COMMON COM 56585A102 746,118 311,147 71.53 39,029 -12.37 0.1244
2015-05-12 2015-03-31 13F MARATHON PETROLEUM CORP COMMON COM 56585A102 434,971 -11,490 -2.57 44,537 10.52 0.1285
2015-02-06 2014-12-31 13F MARATHON PETROLEUM CORP COMMON COM 56585A102 446,461 -15,866 -3.43 40,298 2.95 0.1171
2014-11-12 2014-09-30 13F MARATHON PETROLEUM CORP COMMON COM 56585A102 462,327 -2,629 -0.57 39,145 7.84 0.1176
2014-08-06 2014-06-30 13F MARATHON PETROLEUM CORP COMMON COM 56585A102 464,956 -33,664 -6.75 36,299 -16.36 0.1065
2014-05-06 2014-03-31 13F MARATHON PETROLEUM CORP COMMON COM 56585A102 498,620 -39,290 -7.30 43,400 -12.04 0.1287
2014-02-03 2013-12-31 13F MARATHON PETROLEUM CORP COMMON COM 56585A102 537,910 -49,203 -8.38 49,342 30.66 0.1456
2013-11-05 2013-09-30 13F MARATHON PETROLEUM CORP COMMON COM 56585A102 587,113 541 0.09 37,763 -9.40 0.1170
2013-08-07 2013-06-30 13F MARATHON PETROLEUM CORP COMMON COM 56585A102 586,572 586,572 41,682 0.1339
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.