Magnolia Oil & Gas Corp
Ownership
Ownership Structure
Who owns Magnolia Oil & Gas Corp (MGY)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 87.4% of the shares are freely tradable; institutional investors hold 113.6%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 12.45 | 29,491,149 | +6.6 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 5.48 | 12,983,395 | +0.0 | 03/31/2026 |
| American Century Companies Inc | 4.65 | 11,011,458 | +4.8 | 06/30/2026 |
| State Street Corp | 4.01 | 9,496,275 | +7.9 | 03/31/2026 |
| Vanguard Capital Management, LLC | 3.03 | 7,188,424 | +0.0 | 03/31/2026 |
| Dimensional Fund Advisors, Inc. | 3.00 | 7,117,449 | +1.3 | 06/30/2026 |
| HHG PLC | 2.65 | 6,279,636 | +2.8 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 5.92 | 14,020,908 | +0.0 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.11 | 7,363,096 | +25.4 | 07/31/2026 |
| Avantis US Small Cap Value ETF | 2.95 | 6,998,869 | +0.1 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Acosta Arcilia | Director | 134,721 | 3,462,330 $ | Sep 1, 2026 | direct |
| Khani David M. | Director | 30,676 | 788,373 $ | Sep 1, 2026 | direct |
| Ropp Ralph Lewis | Director | 26,007 | 668,380 $ | Aug 7, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 1, 2026 | Acosta Arcilia | Director | Other | 80 | 0.00 | – |
| Sep 1, 2026 | Khani David M. | Director | Buy | 54 | 26.78 | 1,446 |
| Aug 7, 2026 | Ropp Ralph Lewis | Director | Buy | 5,000 | 24.63 | 123,125 |
| Aug 7, 2026 | Khani David M. | Director | Buy | 8,000 | 25.00 | 200,000 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.