Company · Ownership research

Marathon Petroleum Corp MPC

CIK 0001510295 · CUSIP 56585A102

Insider tradingInitial holdingsInstitutional holders

Quarter-end disclosures, not live holdings.

3 CUSIPs are reported under this ticker. This page covers the one most managers report; the others are not merged in.
This page lists the top 20 of 1916 rows by value; the complete set is available through the API.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value
#ManagerValueManager weightChange vs priorSource

Showing 20 / 1,916 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions
1,916
Cancelled or null records excluded
Disclosed shares
215,032,476
Not deduplicated across managers
Disclosed value
$54.98B
Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Marathon Petroleum Corp · Q2 2026

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This page includes 20 of 1,916 reporting institutions. Sign in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP.

MCP  https://api.akkrudata.ai/mcp

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{"cusip":"56585A102","quarter":"2026Q2","type":"positions","page_size":100}

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.