Who owns Marathon Petroleum (MPC)
Which tracked institutional funds hold MPC, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MPC company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
397 tracked funds added or opened MPC while 247 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
MPC’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.1% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 0.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in MPC divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 1854 tracked filers holding MPC, 832 increased or opened the position and 876 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in MPC between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 49
- LAZARD ASSET MANAGEMENT LLC$65M
- Nykredit A/S$32M
- Arbejdsmarkedets Tillaegspension$27M
- READYSTATE ASSET MANAGEMENT LP$18M
- CAXTON ASSOCIATES LLP$13M
- J. Goldman & Co LP$12M
Full exits 95
- Amundi$465M
- LSV ASSET MANAGEMENT$313M
- LORD, ABBETT & CO. LLC$224M
- ACADIAN ASSET MANAGEMENT LLC$130M
- Thrivent Financial for Lutherans$107M
- NATIXIS ADVISORS, LLC$96M
Largest adds
- BlackRock, Inc.$1.1B
- GEODE CAPITAL MANAGEMENT, LLC$225M
- VANGUARD CAPITAL MANAGEMENT LLC$196M
- FMR LLC$187M
- VANGUARD PORTFOLIO MANAGEMENT LLC$170M
- NORGES BANK$167M
Largest trims
- HARRIS ASSOCIATES L P$627M
- WELLINGTON MANAGEMENT GROUP LLP$544M
- Boston Partners$473M
- CANADA PENSION PLAN INVESTMENT BOARD$143M
- JPMORGAN CHASE & CO$133M
- Invesco Ltd.$78M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 26,006,017 | $6.6B | 13.9% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC trimmed | 19,074,289 | $4.9B | 10.2% | 2026-Q2 |
| STATE STREET CORP trimmed | 18,471,905 | $4.7B | 9.9% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 15,631,265 | $4.0B | 8.4% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 8,351,157 | $2.1B | 4.4% | 2026-Q2 |
| MORGAN STANLEY trimmed | 5,887,382 | $1.5B | 3.1% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 5,684,963 | $1.5B | 3.0% | 2026-Q2 |
| FMR LLC added | 5,419,718 | $1.4B | 2.9% | 2026-Q2 |
| Bank of New York Mellon Corp added | 4,027,107 | $1.0B | 2.2% | 2026-Q2 |
| Boston Partners trimmed | 3,515,417 | $906M | 1.9% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 3,252,153 | $831M | 1.7% | 2026-Q2 |
| NORTHERN TRUST CORP trimmed | 3,126,059 | $799M | 1.7% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 3,056,082 | $781M | 1.6% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 2,884,591 | $738M | 1.5% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 2,736,206 | $709M | 1.5% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 2,622,511 | $670M | 1.4% | 2026-Q2 |
| NORGES BANK trimmed | 2,465,801 | $630M | 1.3% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 2,432,168 | $622M | 1.3% | 2026-Q2 |
| Invesco Ltd. trimmed | 2,341,034 | $599M | 1.3% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 2,030,778 | $520M | 1.1% | 2026-Q2 |
| UBS Group AG added | 1,842,485 | $471M | 1.0% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 1,839,897 | $470M | 1.0% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO trimmed | 1,659,223 | $424M | 0.9% | 2026-Q2 |
| Capital Wealth Planning, LLC trimmed | 1,577,970 | $403M | 0.8% | 2026-Q2 |
| Allianz Asset Management GmbH trimmed | 1,561,285 | $399M | 0.8% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 1,508,489 | $386M | 0.8% | 2026-Q2 |
| US BANCORP \DE\ trimmed | 1,496,414 | $383M | 0.8% | 2026-Q2 |
| Legal & General Group Plc trimmed | 1,489,205 | $381M | 0.8% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC trimmed | 1,394,274 | $356M | 0.7% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 1,239,241 | $317M | 0.7% | 2026-Q2 |
| DEUTSCHE BANK AG\ trimmed | 1,098,138 | $281M | 0.6% | 2026-Q2 |
| Nuveen, LLC added | 1,035,451 | $265M | 0.6% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC added | 1,016,215 | $260M | 0.5% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 964,443 | $247M | 0.5% | 2026-Q2 |
| National Pension Service added | 928,506 | $237M | 0.5% | 2026-Q2 |
| BARCLAYS PLC added | 920,708 | $235M | 0.5% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 843,958 | $216M | 0.5% | 2026-Q2 |
| Swiss National Bank trimmed | 830,666 | $212M | 0.4% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 828,334 | $212M | 0.4% | 2026-Q2 |
| AustralianSuper Pty Ltd added | 797,247 | $204M | 0.4% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 716,275 | $183M | 0.4% | 2026-Q2 |
| Mitsubishi UFJ Asset Management Co., Ltd. added | 711,745 | $182M | 0.4% | 2026-Q2 |
| Vanguard Global Advisers, LLC trimmed | 696,456 | $178M | 0.4% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN trimmed | 692,418 | $177M | 0.4% | 2026-Q2 |
| JONES FINANCIAL COMPANIES LLLP added | 687,912 | $175M | 0.4% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC added | 671,811 | $172M | 0.4% | 2026-Q2 |
| Sumitomo Mitsui Trust Group, Inc. trimmed | 632,538 | $162M | 0.3% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 632,097 | $162M | 0.3% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 615,535 | $157M | 0.3% | 2026-Q2 |
| California Public Employees Retirement System added | 614,359 | $157M | 0.3% | 2026-Q2 |
| FIFTH THIRD BANCORP trimmed | 595,156 | $152M | 0.3% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC added | 581,908 | $149M | 0.3% | 2026-Q2 |
| Mariner, LLC added | 559,173 | $144M | 0.3% | 2026-Q2 |
| Squarepoint Ops LLC added | 554,045 | $142M | 0.3% | 2026-Q2 |
| CITIGROUP INC added | 553,625 | $142M | 0.3% | 2026-Q2 |
| HSBC HOLDINGS PLC added | 545,377 | $140M | 0.3% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD trimmed | 511,495 | $131M | 0.3% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 503,816 | $129M | 0.3% | 2026-Q2 |
| BANK OF MONTREAL /CAN/ trimmed | 483,814 | $124M | 0.3% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 469,785 | $120M | 0.3% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 454,885 | $116M | 0.2% | 2026-Q2 |
| LPL Financial LLC added | 441,653 | $113M | 0.2% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 424,897 | $109M | 0.2% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 412,252 | $105M | 0.2% | 2026-Q2 |
| Empyrean Capital Partners, LP trimmed | 395,600 | $101M | 0.2% | 2026-Q2 |
| LOS ANGELES CAPITAL MANAGEMENT LLC trimmed | 383,151 | $98M | 0.2% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 370,777 | $91M | 0.2% | 2026-Q2 |
| Robeco Institutional Asset Management B.V. added | 365,555 | $93M | 0.2% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 359,389 | $92M | 0.2% | 2026-Q2 |
| Bridgewater Associates, LP added | 349,224 | $89M | 0.2% | 2026-Q2 |
| PNC Financial Services Group, Inc. trimmed | 330,999 | $85M | 0.2% | 2026-Q2 |
| Russell Investments Group, Ltd. trimmed | 325,282 | $83M | 0.2% | 2026-Q2 |
| Man Group plc added | 293,849 | $75M | 0.2% | 2026-Q2 |
| Calamos Advisors LLC trimmed | 290,934 | $74M | 0.2% | 2026-Q2 |
| Merewether Investment Management, LP trimmed | 288,592 | $74M | 0.2% | 2026-Q2 |
| AVIVA PLC added | 272,489 | $70M | 0.1% | 2026-Q2 |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC trimmed | 262,567 | $67M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP added | 261,554 | $67M | 0.1% | 2026-Q2 |
| LAZARD ASSET MANAGEMENT LLC added | 254,813 | $65M | 0.1% | 2026-Q2 |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM trimmed | 250,813 | $64M | 0.1% | 2026-Q2 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 235,160 | $60M | 0.1% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 234,107 | $60M | 0.1% | 2026-Q2 |
| Rockefeller Capital Management L.P. trimmed | 230,883 | $59M | 0.1% | 2026-Q2 |
| HARRIS ASSOCIATES L P trimmed | 229,011 | $59M | 0.1% | 2026-Q2 |
| HM PAYSON & CO trimmed | 227,433 | $58M | 0.1% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 223,151 | $57M | 0.1% | 2026-Q2 |
| ARS Investment Partners, LLC added | 220,952 | $56M | 0.1% | 2026-Q2 |
| Empowered Funds, LLC added | 219,714 | $56M | 0.1% | 2026-Q2 |
| Korea Investment CORP trimmed | 216,010 | $55M | 0.1% | 2026-Q2 |
| MACKENZIE FINANCIAL CORP added | 211,024 | $54M | 0.1% | 2026-Q2 |
| MEYER HANDELMAN CO trimmed | 210,043 | $54M | 0.1% | 2026-Q2 |
| Pictet Asset Management Holding SA trimmed | 207,386 | $53M | 0.1% | 2026-Q2 |
| Hosking Partners LLP trimmed | 206,846 | $53M | 0.1% | 2026-Q2 |
| KAYNE ANDERSON CAPITAL ADVISORS LP added | 206,525 | $53M | 0.1% | 2026-Q2 |
| GABELLI FUNDS LLC trimmed | 206,200 | $53M | 0.1% | 2026-Q2 |
| SEI INVESTMENTS CO added | 205,038 | $52M | 0.1% | 2026-Q2 |
| Steward Partners Investment Advisory, LLC trimmed | 197,998 | $51M | 0.1% | 2026-Q2 |
| Cerity Partners LLC trimmed | 197,580 | $51M | 0.1% | 2026-Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH added | 187,386 | $48M | 0.1% | 2026-Q2 |
| CIBC WORLD MARKET INC. trimmed | 183,341 | $47M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.