BSM insider buying – Black Stone Minerals, L.P.
45 insider purchases since 2016 worth $19.8M by 5 different insiders. Last 12 months: 5 purchases, $3.1M. Most recent filing: 2026-11-10.
Large company Public float $2.3B (latest 10-K, SEC).
Same time range as the chart above - each mark sits under the week of the trade. Circles = purchases (height = price paid, size = amount), red triangles = open-market sales of $50k+. Prices as reported, not adjusted for later stock splits. 19 older purchases (before the 5-year window) are listed in the table below.
Purchases are open-market buys (SEC Form 4, code "P") - insiders paying with their own money. Sales are open-market sales (code "S") of $50,000 or more; many sales are pre-planned (Rule 10b5-1) or made for taxes and diversification. Each row links to the original filing.
Bought, sold, still holding?
| Insider | Bought | First / last buy | Sold since 2016 | Holds now* | Status |
|---|---|---|---|---|---|
| Carter Thomas L Jr Executive Chairman, Director | $15.2M 29× · 988,223 sh | 2016-11-10 2026-11-09 | – | 15,457,747 shares as of 2026-05-14 | Holds - never sold |
| DeWalch D Mark Director | $3.4M 8× · 232,601 sh | 2018-11-16 2026-05-29 | – | 1,111,643 shares as of 2026-07-02 | Holds - never sold |
| Stuart Alexander D. Director | $635,143 3× · 37,950 sh | 2017-03-02 2018-03-06 | – | 6,576,256 shares as of 2026-08-19 | Holds - never sold |
| Mathis William N. Director | $401,505 3× · 26,789 sh | 2016-03-10 2018-11-09 | – | 2,271,376 shares as of 2025-10-07 | Holds - never sold |
| Haeflinger Ricky J. Director | $65,310 2× · 4,000 sh | 2016-05-13 2017-03-07 | – | 23,389 shares as of 2020-01-15 | Holds - never sold |
* Shares held after the insider's most recent SEC filing for this company (all share classes, direct and indirect). If an insider stops filing, later changes are not known.
Insider buying and selling by year
| Year | Purchases | Bought | Buyers | Sales | Sold |
|---|---|---|---|---|---|
| 2026 | 5 | $3.1M | 2 | 6 | $38.5M |
| 2025 | 6 | $2.2M | 1 | 1 | $500,364 |
| 2024 | 3 | $2.0M | 2 | 1 | $275,015 |
| 2023 | 7 | $5.2M | 2 | 1 | $1.5M |
| 2022 | 5 | $4.2M | 1 | 3 | $1.3M |
| 2021 | 0 | – | – | 3 | $1.1M |
| 2020 | 0 | – | – | 2 | $452,068 |
| 2019 | 1 | $87,954 | 1 | 6 | $3.0M |
| 2018 | 5 | $967,108 | 4 | 8 | $2.7M |
| 2017 | 6 | $1.1M | 3 | 5 | $1.1M |
| 2016 | 7 | $1.0M | 3 | – | – |
Insider purchases
| Filed | Insider | Role | Shares | Avg price | Value | Holdings | Filing |
|---|---|---|---|---|---|---|---|
| 2026-11-10 | Carter Thomas L Jr | Executive Chairman, Director | 50,000 | $13.73 | $686,290 | +1% | SEC |
| 2026-06-02 | DeWalch D Mark | Director | 72,726 | $13.55 | $985,437 | +13.0% | SEC |
| 2026-05-28 | DeWalch D Mark | Director | 37,650 | $13.21 | $497,356 | +9.6% | SEC |
| 2026-05-14 | Carter Thomas L Jr | Officer | 1,120 | $13.50 | $15,120 | +0.0% | SEC |
| 2026-05-12 | Carter Thomas L Jr | Officer | 67,758 | $13.42 | $909,351 | +1.9% | SEC |
| 2025-09-12 | Carter Thomas L Jr | CEO | 15,300 | $12.57 | $192,367 | +0.4% | SEC |
| 2025-09-10 | Carter Thomas L Jr | CEO | 25,370 | $12.08 | $306,550 | +0.7% | SEC |
| 2025-08-20 | Carter Thomas L Jr | CEO | 41,000 | $12.00 | $492,030 | +1.2% | SEC |
| 2025-08-14 | Carter Thomas L Jr | CEO | 9,200 | $12.36 | $113,712 | +0.3% | SEC |
| 2025-08-11 | Carter Thomas L Jr | CEO | 72,210 | $12.18 | $879,250 | +2.2% | SEC |
| 2025-05-21 | Carter Thomas L Jr | CEO | 14,500 | $13.52 | $196,040 | +0.4% | SEC |
| 2024-09-09 | Carter Thomas L Jr | CEO | 100,000 | $14.12 | $1.4M | +3.3% | SEC |
| 2024-08-15 | DeWalch D Mark | Director | 34,200 | $14.62 | $500,004 | +10.6% | SEC |
| 2024-02-27 | DeWalch D Mark | Director | 3,250 | $15.47 | $50,278 | +1.0% | SEC |
| 2023-12-08 | Carter Thomas L Jr | CEO | 31,075 | $16.00 | $497,325 | +1.1% | SEC |
| 2023-11-17 | DeWalch D Mark | Director | 44,000 | $17.32 | $761,964 | +16.9% | SEC |
| 2023-11-08 | Carter Thomas L Jr | CEO | 58,577 | $17.94 | $1.1M | +2.2% | SEC |
| 2023-11-06 | Carter Thomas L Jr | CEO | 50,000 | $18.30 | $915,250 | +1.9% | SEC |
| 2023-05-08 | Carter Thomas L Jr | CEO | 31,800 | $15.53 | $493,854 | +1.2% | SEC |
| 2023-03-07 | DeWalch D Mark | Director | 34,250 | $15.85 | $542,862 | +15.1% | SEC |
| 2023-02-27 | Carter Thomas L Jr | CEO | 62,500 | $15.44 | $965,300 | +2.4% | SEC |
| 2022-12-08 | Carter Thomas L Jr | CEO | 48,492 | $17.30 | $838,927 | +2.1% | SEC |
| 2022-11-07 | Carter Thomas L Jr | CEO | 50,000 | $19.38 | $968,750 | +2.2% | SEC |
| 2022-09-15 | Carter Thomas L Jr | CEO | 24,631 | $16.30 | $401,485 | +1.1% | SEC |
| 2022-09-14 | Carter Thomas L Jr | CEO | 75,000 | $16.29 | $1.2M | +3.4% | SEC |
| 2022-08-08 | Carter Thomas L Jr | CEO | 50,000 | $14.89 | $744,400 | +2.3% | SEC |
| 2019-06-12 | DeWalch D Mark | Director | 5,350 | $16.44 | $87,954 | +15.1% | SEC |
| 2018-12-10 | Carter Thomas L Jr | CEO | 15,300 | $16.24 | $248,472 | +1.8% | SEC |
| 2018-11-19 | DeWalch D Mark | Director | 1,175 | $17.06 | $20,046 | +24.4% | SEC |
| 2018-11-13 | Mathis William N. | Director | 11,400 | $16.79 | $191,358 | +1.9% | SEC |
| 2018-03-06 | Stuart Alexander D. | Director | 15,000 | $17.43 | $261,450 | +4.7% | SEC |
| 2018-03-02 | Carter Thomas L Jr | CEO | 14,240 | $17.26 | $245,782 | +1.5% | SEC |
| 2017-06-09 | Stuart Alexander D. | Director | 18,650 | $16.00 | $298,400 | +6.4% | SEC |
| 2017-06-09 | Carter Thomas L Jr | CEO | 7,750 | $15.86 | $122,915 | +0.7% | SEC |
| 2017-05-12 | Carter Thomas L Jr | CEO | 17,600 | $16.94 | $298,216 | +1.6% | SEC |
| 2017-03-08 | Haeflinger Ricky J. | Director | 1,000 | $17.04 | $17,040 | +11.1% | SEC |
| 2017-03-06 | Stuart Alexander D. | Director | 4,300 | $17.51 | $75,293 | +1.5% | SEC |
| 2017-03-06 | Carter Thomas L Jr | CEO | 14,000 | $17.51 | $245,196 | +1.3% | SEC |
| 2016-11-29 | Carter Thomas L Jr | CEO | 13,000 | $18.93 | $246,090 | +2.6% | SEC |
| 2016-11-18 | Carter Thomas L Jr | CEO | 3,000 | $18.21 | $54,630 | +0.6% | SEC |
Showing the latest 40 of 45 purchases.
Insider sales
| Filed | Insider | Role | Shares | Avg price | Value | Type | Filing |
|---|---|---|---|---|---|---|---|
| 2026-11-10 | Whitehead James | Director | -671,210 | $13.42 | $9.0M | Sale | SEC |
| 2026-08-10 | Whitehead James | Director | 2,127,105 | $13.21 | $28.1M | Sale | SEC |
| 2026-05-13 | Longmaid Ashley J | Director | 11,128 | $13.45 | $149,672 | Sale | SEC |
| 2026-05-06 | Putman Luke Stevens | Officer | 29,386 | $13.75 | $404,058 | Pre-planned (10b5-1) | SEC |
| 2026-04-07 | Putman Luke Stevens | Officer | 29,386 | $14.45 | $424,628 | Sale | SEC |
| 2026-03-06 | Putman Luke Stevens | Officer | 30,276 | $15.25 | $461,709 | Pre-planned (10b5-1) | SEC |
| 2025-05-30 | Clark Carrie Pearson | Officer | 36,900 | $13.56 | $500,364 | Sale | SEC |
| 2024-08-26 | Clark Carrie Pearson | Officer | 18,532 | $14.84 | $275,015 | Sale | SEC |
| 2023-05-05 | Putman Luke Stevens | Officer | 100,000 | $15.06 | $1.5M | Sale | SEC |
| 2022-11-09 | Smajstrla Dawn | Officer | 5,300 | $19.41 | $102,873 | Sale | SEC |
| 2022-03-03 | Wood Jeffrey P. | CEO | 40,000 | $12.24 | $489,600 | Sale | SEC |
| 2022-02-25 | Putman Luke Stevens | Officer | 60,000 | $11.82 | $709,200 | Sale | SEC |
| 2021-09-02 | Smajstrla Dawn | Officer | 7,500 | $9.97 | $74,775 | Sale | SEC |
| 2021-05-21 | Putman Luke Stevens | Officer | 50,000 | $9.82 | $491,000 | Sale | SEC |
| 2021-05-10 | Wood Jeffrey P. | CEO | 50,000 | $10.51 | $525,500 | Sale | SEC |
Showing the latest 15 of 36 sales of $50,000+ since 2016.
Recent company events (SEC 8-K)
- 2026-11-03 - Quarterly results released (SEC)
Compiled automatically from public SEC filings. Not investment advice. Get every new insider purchase in the daily report.
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