| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
Director
1 company
D Mark DeWalch is Director at BSM. D Mark DeWalch's net worth is not public. Form 4 filings only show shares in the companies where this person is an insider; those holdings are worth an estimated $6.5M at current prices.
Our model assigns D Mark DeWalch a below-average insider score of 48/100, based on 8 past trades. Over a 12-month horizon, none of those trades were profitable, with an average 12-month return of -9.2%.
Net of sales, the BSM filings show accumulation of 237,816 shares.
D Mark DeWalch has 36 Form 4 filings on record from May 2015 to October 2026, all as Director at Black Stone Minerals (BSM), 2015–2026.
The 68 reported transactions were 23 stock awards, 16 conversions, 15 open-market purchases and 14 other transactions.
Counted by filing, the open-market trades come to 10 purchases worth about $3.5M and no sales.
The largest open-market purchase was 72,726 shares of BSM at an average $13.55 on June 1, 2026, about $985K.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Jun 1, 2026 | BSM Black Stone Minerals, L.P. | Director | Buy | 72,726 | $13.55 | $985,353.67 | +13.0% | +8.9% | - | |
| May 28, 2026 | BSM Black Stone Minerals, L.P. | Director | Buy | 37,650 | $13.21 | $497,341.44 | +9.6% | +11.2% | - | |
| Aug 15, 2024 | BSM Black Stone Minerals, L.P. | Director | Buy | 34,200 | $14.62 | $500,004.00 | +10.6% | +4.0% | -15.7% | |
| Feb 26, 2024 | BSM Black Stone Minerals, L.P. | Director | Buy | 3,250 | $15.47 | $50,277.18 | +1.0% | +4.2% | -2.3% | |
| Nov 17, 2023 | BSM Black Stone Minerals, L.P. | Director | Buy | 44,000 | $17.32 | $761,951.64 | +16.9% | -12.3% | -12.9% | |
| Mar 6, 2023 | BSM Black Stone Minerals, L.P. | Director | Buy | 34,250 | $15.85 | $542,843.46 | -164.4% | +1.5% | -2.8% | |
| Jun 10, 2019 | BSM Black Stone Minerals, L.P. | Director | Buy | 5,350 | $16.44 | $87,954.00 | +15.1% | - | - | |
| Nov 16, 2018 | BSM Black Stone Minerals, L.P. | Director | Buy | 1,175 | $17.06 | $20,044.09 | +24.4% | - | - | |
| Jul 30, 2015 | BSM Black Stone Minerals, L.P. | Director | Buy | 15 | $14.56 | $218.40 | +0.3% | - | - | |
| May 6, 2015 | BSM Black Stone Minerals, L.P. | Director | Buy | 5,200 | $19.00 | $98,800.00 | +6.3% | - | - |