Marathon Petroleum Corporation
MX ˙ BMV ˙ US56585A1025
SecurityMX:MPC / Marathon Petroleum Corporation
Institution1st Source Bank
Latest Disclosed Ownership4,299 shares
Latest Disclosed Value $ 1,049,730
1st Source Bank ownership in MPC / Marathon Petroleum Corporation

On May 4, 2026 - 1st Source Bank filed a 13F-HR form disclosing ownership of 4,299 shares of Marathon Petroleum Corporation (MX:MPC) valued at $1,049,730 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 4,299 shares of Marathon Petroleum Corporation. This represents a change in shares of 0.00% 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)
2026-05-04 2026-03-31 13F MARATHON PETE COM 56585A102 4,299 0 0.00 1,050 50.07 0.0542
2026-02-05 2025-12-31 13F MARATHON PETE COM 56585A102 4,299 -245 -5.39 699 -20.11 0.0367
2025-11-12 2025-09-30 13F MARATHON PETE COM 56585A102 4,544 0 0.00 876 16.05 0.0462
2025-08-07 2025-06-30 13F MARATHON PETE COM 56585A102 4,544 -28 -0.61 755 13.21 0.0416
2025-05-05 2025-03-31 13F MARATHON PETE COM 56585A102 4,572 28 0.62 666 5.21 0.0393
2025-02-10 2024-12-31 13F Marathon Petroleum COM 56585A102 4,544 26 0.58 634 -13.99 0.0363
2024-12-11 2024-09-30 13F Marathon Petroleum COM 56585A102 4,518 0 0.00 736 -6.00 0.0415
2024-08-08 2024-06-30 13F MARATHON PETROLEUM COM 56585A102 4,518 406 9.87 784 -5.43 0.0458
2024-05-09 2024-03-31 13F MARATHON PETROLEUM COM 56585A102 4,112 0 0.00 829 35.74 0.0482
2024-02-08 2023-12-31 13F MARATHON PETROLEUM COM 56585A102 4,112 0 0.00 610 -1.93 0.0369
2023-11-09 2023-09-30 13F MARATHON PETROLEUM COM 56585A102 4,112 -85 -2.03 622 27.20 0.0424
2023-08-09 2023-06-30 13F MARATHON PETROLEUM COM 56585A102 4,197 0 0.00 489 -13.45 0.0316
2023-05-09 2023-03-31 13F MARATHON PETROLEUM COM 56585A102 4,197 0 0.00 566 15.78 0.0376
2023-02-13 2022-12-31 13F MARATHON PETROLEUM COM 56585A102 4,197 -39 -0.92 488 15.91 0.0321
2022-11-04 2022-09-30 13F MARATHON PETROLEUM COM 56585A102 4,236 0 0.00 421 20.98 0.0306
2022-08-05 2022-06-30 13F MARATHON PETROLEUM COM 56585A102 4,236 0 0.00 348 -3.87 0.0246
2022-05-05 2022-03-31 13F MARATHON PETROLEUM COM 56585A102 4,236 55 1.32 362 35.07 0.0222
2022-02-09 2021-12-31 13F MARATHON PETROLEUM COM 56585A102 4,181 0 0.00 268 3.88 0.0157
2021-11-05 2021-09-30 13F MARATHON PETROLEUM COM 56585A102 4,181 336 8.74 258 11.21 0.0163
2021-08-03 2021-06-30 13F MARATHON PETROLEUM COM 56585A102 3,845 3,845 232 0.0146
2020-04-29 2020-03-31 13F MARATHON PETROLEUM COM 56585A102 0 -5,517 -100.00 0 -100.00
2020-01-27 2019-12-31 13F MARATHON PETROLEUM COM 56585A102 5,517 141 2.62 332 1.53 0.0249
2019-11-06 2019-09-30 13F MARATHON PETROLEUM COM 56585A102 5,376 -103 -1.88 327 6.86 0.0268
2019-07-29 2019-06-30 13F MARATHON PETROLEUM COM 56585A102 5,479 162 3.05 306 -3.77 0.0250
2019-04-29 2019-03-31 13F MARATHON PETROLEUM COM 56585A102 5,317 -76 -1.41 318 0.00 0.0271
2019-02-11 2018-12-31 13F MARATHON PETROLEUM COM 56585A102 5,393 -493 -8.38 318 -32.48 0.0309
2018-10-31 2018-09-30 13F MARATHON PETROLEUM COM 56585A102 5,886 0 0.00 471 14.04 0.0373
2018-08-02 2018-06-30 13F MARATHON PETROLEUM COM 56585A102 5,886 559 10.49 413 6.17 0.0335
2018-04-24 2018-03-31 13F MARATHON PETROLEUM COM 56585A102 5,327 -62 -1.15 389 9.27 0.0322
2018-02-13 2017-12-31 13F MARATHON PETROLEUM COM 56585A102 5,389 19 0.35 356 18.27 0.0293
2017-10-27 2017-09-30 13F MARATHON PETROLEUM COM 56585A102 5,370 0 0.00 301 7.12 0.0250
2017-07-26 2017-06-30 13F MARATHON PETROLEUM COM 56585A102 5,370 -389 -6.75 281 -3.44 0.0242
2017-04-26 2017-03-31 13F MARATHON PETROLEUM COM 56585A102 5,759 0 0.00 291 0.34 0.0258
2017-02-09 2016-12-31 13F MARATHON PETROLEUM COM 56585A102 5,759 460 8.68 290 34.88 0.0275
2016-10-27 2016-09-30 13F MARATHON PETROLEUM COM 56585A102 5,299 5,299 -7.99 215 -25.86 0.0227
2016-04-26 2016-03-31 13F MARATHON PETROLEUM COM 56585A102 0 -4,568 -100.00 0 -100.00
2016-01-29 2015-12-31 13F MARATHON PETROLEUM COM 56585A102 4,568 242 5.59 236 18.00 0.0274
2015-10-20 2015-09-30 13F MARATHON PETROLEUM COM 56585A102 4,326 7 0.16 200 -11.50 0.0229
2015-08-04 2015-06-30 13F MARATHON PETROLEUM COM 56585A102 4,319 2,147 98.85 226 1.80 0.0245
2015-04-27 2015-03-31 13F MARATHON PETROLEUM COM 56585A102 2,172 -201 -8.47 222 3.74 0.0266
2015-02-10 2014-12-31 13F MARATHON PETROLEUM COM 56585A102 2,373 -3 -0.13 214 6.47 0.0257
2014-10-30 2014-09-30 13F MARATHON PETROLEUM COR COM 56585A102 2,376 69 2.99 201 0.00 0.0266
2014-04-28 2014-03-31 13F MARATHON PETROLEUM COR COM 56585A102 2,307 4 0.17 201 -5.19 0.0268
2014-02-13 2013-12-31 13F MARATHON PETROLEUM COM 56585A102 2,303 -783 -25.37 212 -3.20 0.0285
2013-08-08 2013-06-30 13F MARATHON PETE COM 56585A102 3,086 3,086 219 0.0370
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.