2 institutions reported holding $2.0M of MARATHON OIL CORP (MRO) in SEC 13F filings for 2026-03-31. Largest institutional holders: Kentucky Retirement Systems ($2.0M), HUNTINGTON NATIONAL BANK ($59). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | Kentucky Retirement Systems | $2.0M | 57,515 | New |
| 2 | HUNTINGTON NATIONAL BANK | $59 | 2 | Hold |
Source: SEC Form 13F filings · as of 2026-03-31