2 institutions reported holding $236,775 of MAGNOLIA OIL & GAS CORP (MGY.WS) in SEC 13F filings for 2026-03-31. Largest institutional holders: SIMPLEX TRADING, LLC ($176,792), GROUP ONE TRADING LLC ($59,983). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | SIMPLEX TRADING, LLC | $176,792 | 5,600 | Added |
| 2 | GROUP ONE TRADING LLC | $59,983 | 1,900 | Trimmed |
Source: SEC Form 13F filings · as of 2026-03-31