As of September 09, 2026, Mach Natural Resources's top three insider holders are William Wallace Mcmullen (Director, 74.86Mn shares), William Wallace Mcmullen (Director, 74.86Mn shares), William Wallace Mcmullen (Director, 74.29Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | William Wallace Mcmullen | Director, TenPercentOwner, Other | 0 | 74,859,917 | 74,859,917 | 56.6% | 23 Mar, 2026 |
| 2 | General Partner S.A R.L. Ikav | TenPercentOwner | 0 | 23,631,109 | 23,631,109 | 17.9% | 19 May, 2026 |
| 3 | Anderson Capital Advisors Lp Kayne | TenPercentOwner | 0 | 18,960,034 | 18,960,034 | 14.3% | 11 Feb, 2026 |
| 4 | Tom L. Ward | Director, Officer, TenPercentOwner, Other | 0 | 13,371,667 | 13,371,667 | 10.1% | 13 Apr, 2026 |
| 5 | Daniel T Jr. Reineke | Officer, Other | 767,054 | 0 | 767,054 | 0.6% | 31 Oct, 2023 |
| 6 | Kevin R. White | Officer, Other | 455,871 | 0 | 455,871 | 0.3% | 11 Feb, 2026 |
| 7 | Michael E Reel | Officer, Other | 85,816 | 0 | 85,816 | 0.1% | 11 Feb, 2026 |
| 8 | Frank A Keating | Director, Other | 29,111 | 0 | 29,111 | 0.0% | 30 Oct, 2025 |
| 9 | Stephen C Perich | Director, Other | 29,111 | 0 | 29,111 | 0.0% | 30 Oct, 2025 |
| 10 | Edgar R. Jr. Giesinger | Director, Other | 29,111 | 0 | 29,111 | 0.0% | 30 Oct, 2025 |
| 11 | Christopher Burn | Director, Other | 15,587 | 0 | 15,587 | 0.0% | 23 Mar, 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 |
|---|---|---|---|---|---|---|---|---|
| 15 May, 2026 | General Partner S.A R.L. Ikav | TenPercentOwner | Disposed J | 1,422,476 | $14.06 | $20.00Mn | 19,371,999 | Indirect |
| 13 Apr, 2026 | Tom L. Ward | Director, Officer, TenPercentOwner, Other | Acquired P | 76,628 | $13.05 | $1,000.00K | 13,295,039 | Indirect |
| 13 Apr, 2026 | Tom L. Ward | Director, Officer, TenPercentOwner, Other | Acquired P | 76,628 | $13.05 | $1,000.00K | 76,628 | Indirect |
| 08 Apr, 2026 | General Partner S.A R.L. Ikav | TenPercentOwner | Disposed S | 4,612,874 | $12.81 | $59.09Mn | 20,794,475 | Indirect |
| 08 Apr, 2026 | General Partner S.A R.L. Ikav | TenPercentOwner | Disposed S | 4,612,874 | $12.81 | $59.09Mn | 20,794,475 | Indirect |
| 08 Apr, 2026 | General Partner S.A R.L. Ikav | TenPercentOwner | Disposed S | 4,612,874 | $12.81 | $59.09Mn | 20,794,475 | Indirect |
| 08 Apr, 2026 | General Partner S.A R.L. Ikav | TenPercentOwner | Disposed S | 4,612,874 | $12.81 | $59.09Mn | 20,794,475 | Indirect |
| 08 Apr, 2026 | General Partner S.A R.L. Ikav | TenPercentOwner | Disposed S | 4,612,874 | $12.81 | $59.09Mn | 20,794,475 | Indirect |
| 08 Apr, 2026 | General Partner S.A R.L. Ikav | TenPercentOwner | Disposed S | 944,805 | $12.81 | $12.10Mn | 4,259,110 | Indirect |
| 08 Apr, 2026 | General Partner S.A R.L. Ikav | TenPercentOwner | Disposed S | 944,805 | $12.81 | $12.10Mn | 4,259,110 | Indirect |
| 08 Apr, 2026 | General Partner S.A R.L. Ikav | TenPercentOwner | Disposed S | 944,805 | $12.81 | $12.10Mn | 4,259,110 | Indirect |
| 08 Apr, 2026 | General Partner S.A R.L. Ikav | TenPercentOwner | Disposed S | 944,805 | $12.81 | $12.10Mn | 4,259,110 | Indirect |
| 08 Apr, 2026 | General Partner S.A R.L. Ikav | TenPercentOwner | Disposed S | 944,805 | $12.81 | $12.10Mn | 4,259,110 | Indirect |
| 19 Mar, 2026 | William Wallace Mcmullen | Director, TenPercentOwner, Other | Acquired P | 3,570 | $14.00 | $49.98K | 74,854,202 | Indirect |
| 19 Mar, 2026 | William Wallace Mcmullen | Director, TenPercentOwner, Other | Acquired P | 3,570 | $14.00 | $49.98K | 74,854,202 | Indirect |
| 19 Mar, 2026 | William Wallace Mcmullen | Director, TenPercentOwner, Other | Acquired P | 3,570 | $14.00 | $49.98K | 74,854,202 | Indirect |
| 19 Mar, 2026 | William Wallace Mcmullen | Director, TenPercentOwner, Other | Acquired P | 3,570 | $14.00 | $49.98K | 74,854,202 | Indirect |
| 19 Mar, 2026 | William Wallace Mcmullen | Director, TenPercentOwner, Other | Acquired P | 3,570 | $14.00 | $49.98K | 74,854,202 | Indirect |
| 19 Mar, 2026 | William Wallace Mcmullen | Director, TenPercentOwner, Other | Acquired P | 3,570 | $14.00 | $49.98K | 74,854,202 | Indirect |
| 19 Mar, 2026 | William Wallace Mcmullen | Director, TenPercentOwner, Other | Acquired P | 3,570 | $14.00 | $49.98K | 74,854,202 | Indirect |