Magnolia Oil & Gas Corporation (MGY) ownership: Top institutional holder: BlackRock, Inc. ($931.04M). Insider activity: Net Seller (0 buys, 20 sells). 10 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 29491149.00 | $931.04M | 2026-03-31 |
| VANGUARD GROUP INC | 19644960.00 | $430.03M | 2025-12-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 12983395.00 | $409.89M | 2026-03-31 |
| AMERICAN CENTURY COMPANIES INC | 10509240.00 | $331.78M | 2026-03-31 |
| STATE STREET CORP | 9496275.00 | $299.80M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 7188424.00 | $226.94M | 2026-03-31 |
| DIMENSIONAL FUND ADVISORS LP | 7028781.00 | $221.91M | 2026-03-31 |
| JANUS HENDERSON GROUP PLC | 6279636.00 | $198.25M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-01 | |
| Sell | null | 2026-06-01 | |
| Sell | null | 2026-05-08 | |
| Sell | null | 2026-05-08 | |
| Sell | null | 2026-05-08 | |
| Sell | null | 2026-05-08 | |
| Sell | null | 2026-05-08 | |
| Sell | null | 2026-05-08 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.