As of September 09, 2026, the three largest insider holders of MGY are John B Walker (Director, 16.28Mn shares), John B Walker (Director, 16.28Mn shares), John B Walker (Director, 16.28Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | John B Walker | Director | 0 | 2,099,403 | 2,099,403 | 31.1% | 25 Sep, 2024 |
| 2 | Ltd. Enervest, | Director | 2,099,403 | 0 | 2,099,403 | 31.1% | 25 Sep, 2024 |
| 3 | Christopher G Stavros | Ceo Chairman | 883,592 | 0 | 883,592 | 13.1% | 11 Mar, 2026 |
| 4 | Timothy D. Yang | Evp, Chief Legal Comm Sec | 526,661 | 0 | 526,661 | 7.8% | 11 Mar, 2026 |
| 5 | Steve Millican | Svp Operations | 328,820 | 0 | 328,820 | 4.9% | 05 Mar, 2024 |
| 6 | Brian Corales | Svp Chief Financial Officer | 184,178 | 0 | 184,178 | 2.7% | 11 Mar, 2026 |
| 7 | Arcilia Acosta | Director | 134,721 | 0 | 134,721 | 2.0% | 03 Sep, 2026 |
| 8 | Dan F Smith | Director | 127,232 | 0 | 127,232 | 1.9% | 12 May, 2026 |
| 9 | Edward P Djerejian | Director | 116,745 | 0 | 116,745 | 1.7% | 12 May, 2026 |
| 10 | James R Larson | Director | 97,295 | 0 | 97,295 | 1.4% | 12 May, 2026 |
| 11 | Angela M Busch | Director | 94,161 | 0 | 94,161 | 1.4% | 05 Mar, 2024 |
| 12 | David M. Khani | Director | 30,676 | 0 | 30,676 | 0.5% | 03 Sep, 2026 |
| 13 | Ralph Lewis Ropp | Director | 26,007 | 0 | 26,007 | 0.4% | 11 Aug, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 07 Aug, 2026 | David M. Khani | Director | Acquired P | 8,000 | $25.00 | $200.00K | 30,622 | Direct |
| 07 Aug, 2026 | Ralph Lewis Ropp | Director | Acquired P | 5,000 | $24.63 | $123.13K | 26,007 | Direct |
| 01 Jun, 2026 | Arcilia Acosta | Director | Acquired A | 72 | $0.00 | $0 | 134,641 | Direct |
| 08 May, 2026 | Dan F Smith | Director | Acquired A | 8,028 | $0.00 | $0 | 127,232 | Direct |
| 08 May, 2026 | David M. Khani | Director | Acquired A | 6,320 | $0.00 | $0 | 22,622 | Direct |
| 08 May, 2026 | James R Larson | Director | Acquired A | 6,320 | $0.00 | $0 | 97,295 | Direct |
| 08 May, 2026 | Ralph Lewis Ropp | Director | Acquired A | 6,320 | $0.00 | $0 | 21,007 | Direct |
| 08 May, 2026 | Edward P Djerejian | Director | Acquired A | 6,320 | $0.00 | $0 | 116,745 | Direct |
| 08 May, 2026 | Arcilia Acosta | Director | Acquired A | 6,320 | $0.00 | $0 | 134,569 | Direct |
| 09 Mar, 2026 | Brian Corales | Svp Chief Financial Officer | Disposed S | 33,000 | $29.12 | $960.96K | 184,178 | Direct |
| 09 Mar, 2026 | Timothy D. Yang | Evp, Chief Legal Comm Sec | Disposed S | 150,000 | $29.29 | $4.39Mn | 526,661 | Direct |
| 09 Mar, 2026 | Christopher G Stavros | Ceo Chairman | Disposed S | 119,954 | $29.29 | $3.51Mn | 883,592 | Direct |
| 09 Mar, 2026 | Timothy D. Yang | Evp, Chief Legal Comm Sec | Disposed S | 150,000 | $29.29 | $4.39Mn | 526,661 | Direct |
| 09 Mar, 2026 | Dan F Smith | Director | Disposed S | 18,000 | $29.01 | $522.22K | 119,204 | Direct |
| 09 Mar, 2026 | Christopher G Stavros | Ceo Chairman | Disposed S | 119,954 | $29.29 | $3.51Mn | 883,592 | Direct |
| 09 Mar, 2026 | Timothy D. Yang | Evp, Chief Legal Comm Sec | Disposed S | 150,000 | $29.29 | $4.39Mn | 526,661 | Direct |
| 09 Mar, 2026 | Arcilia Acosta | Director | Disposed S | 19,235 | $29.10 | $559.78K | 128,249 | Direct |
| 09 Mar, 2026 | Christopher G Stavros | Ceo Chairman | Disposed S | 119,954 | $29.29 | $3.51Mn | 883,592 | Direct |
| 09 Mar, 2026 | Christopher G Stavros | Ceo Chairman | Disposed S | 119,954 | $29.29 | $3.51Mn | 883,592 | Direct |
| 09 Mar, 2026 | Timothy D. Yang | Evp, Chief Legal Comm Sec | Disposed S | 150,000 | $29.29 | $4.39Mn | 526,661 | Direct |