MARATHON OIL CORP (MRO) Institutional Ownership and Insiders Activity

MARATHON OIL CORP (MRO) is widely held by institutional investors, with 1 firm reporting positions valued at approximately $29 based on SEC Form 13F filings for the quarter ended June 30, 2026.

Huntington National Bank is the largest disclosed holder, reporting approximately $29 in MRO holdings in its latest filing.

Institutional ownership remains highly concentrated, with Huntington National Bank representing the majority of disclosed value.