Dorchester Minerals's top three insider shareholders as of September 09, 2026 are William Casey Mcmanemin (Chairman Of The Board, 706.48K shares), William Casey Mcmanemin (Chairman Of The Board, 706.48K shares), Bradley J Ehrman (Chief Executive Officer, 142.72K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | William Casey Mcmanemin | Chairman Of The Board | 706,481 | 0 | 706,481 | 63.9% | 11 Apr, 2024 |
| 2 | Bradley J Ehrman | Chief Executive Officer | 0 | 142,723 | 142,723 | 12.9% | 12 May, 2026 |
| 3 | Leslie A Moriyama | Chief Financial Officer | 103,405 | 0 | 103,405 | 9.4% | 19 Aug, 2026 |
| 4 | Minerals Operating Lp Dorchester | Other | 70,017 | 0 | 70,017 | 6.3% | 02 Jun, 2026 |
| 5 | Robert C Vaughn | Director | 20,547 | 0 | 20,547 | 1.9% | 02 Dec, 2025 |
| 6 | Ronald Paul Trout | Director | 19,672 | 0 | 19,672 | 1.8% | 06 Dec, 2021 |
| 7 | Allen D Lassiter | Director | 18,767 | 0 | 18,767 | 1.7% | 06 Dec, 2021 |
| 8 | Charles William Russell | Director | 14,767 | 0 | 14,767 | 1.3% | 06 Dec, 2021 |
| 9 | Frank Damon Box | Director | 9,000 | 0 | 9,000 | 0.8% | 03 Dec, 2025 |
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 |
|---|---|---|---|---|---|---|---|---|
| 19 Aug, 2026 | Leslie A Moriyama | Chief Financial Officer | Acquired P | 5,197 | $28.30 | $147.08K | 103,405 | Direct |
| 01 Jun, 2026 | Minerals Operating Lp Dorchester | Other | Acquired P | 2,500 | $27.64 | $69.10K | 65,017 | Direct |
| 01 Jun, 2026 | Minerals Operating Lp Dorchester | Other | Acquired P | 999 | $27.62 | $27.59K | 66,016 | Direct |
| 01 Jun, 2026 | Minerals Operating Lp Dorchester | Other | Acquired P | 4,001 | $27.50 | $110.03K | 70,017 | Direct |
| 20 May, 2026 | Minerals Operating Lp Dorchester | Other | Acquired P | 1,500 | $28.24 | $42.36K | 56,517 | Direct |
| 20 May, 2026 | Minerals Operating Lp Dorchester | Other | Acquired P | 6,000 | $28.32 | $169.92K | 62,517 | Direct |
| 12 May, 2026 | Bradley J Ehrman | Chief Executive Officer | Acquired P | 4,000 | $26.78 | $107.12K | 142,723 | Indirect |
| 11 Feb, 2026 | Minerals Operating Lp Dorchester | Other | Acquired P | 10,000 | $25.29 | $252.90K | 45,017 | Direct |
| 12 Feb, 2026 | Minerals Operating Lp Dorchester | Other | Acquired P | 5,000 | $25.08 | $125.40K | 50,017 | Direct |
| 13 Feb, 2026 | Minerals Operating Lp Dorchester | Other | Acquired P | 5,000 | $25.29 | $126.45K | 55,017 | Direct |
| 19 Dec, 2025 | Minerals Operating Lp Dorchester | Other | Acquired P | 5,000 | $22.23 | $111.13K | 25,017 | Direct |
| 22 Dec, 2025 | Minerals Operating Lp Dorchester | Other | Acquired P | 10,000 | $22.30 | $222.99K | 35,017 | Direct |
| 17 Dec, 2025 | Minerals Operating Lp Dorchester | Other | Acquired P | 4,271 | $22.19 | $94.79K | 4,288 | Direct |
| 18 Dec, 2025 | Minerals Operating Lp Dorchester | Other | Acquired P | 15,729 | $22.28 | $350.42K | 20,017 | Direct |
| 15 Dec, 2025 | Leslie A Moriyama | Chief Financial Officer | Acquired M | 4,351 | $0.00 | $0 | 99,964 | Direct |
| 15 Dec, 2025 | Leslie A Moriyama | Chief Financial Officer | Disposed F | 1,756 | $0.00 | $0 | 98,208 | Direct |
| 15 Dec, 2025 | Bradley J Ehrman | Chief Executive Officer | Acquired M | 4,727 | $0.00 | $0 | 34,437 | Direct |
| 15 Dec, 2025 | Leslie A Moriyama | Chief Financial Officer | Disposed M | 4,351 | $0.00 | $0 | 4,350 | Direct |
| 15 Dec, 2025 | Bradley J Ehrman | Chief Executive Officer | Disposed F | 1,719 | $0.00 | $0 | 32,718 | Direct |
| 15 Dec, 2025 | Bradley J Ehrman | Chief Executive Officer | Disposed M | 4,727 | $0.00 | $0 | 4,726 | Direct |