D Mark DeWalch insider trades: Black Stone Minerals, L.P. (BSM) stock purchases
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where D reports to the SEC
Open-market buys and sales
13 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Jun 1, 2026 | BSM | ↑ Buy | 72,726 | $13.55 | $985K | By DeWalch Diversified LP | Jun 2, 2026 (1d) |
| May 28, 2026 | BSM | ↑ Buy | 37,650 | $13.21 | $497K | Direct | May 28, 2026 (0d) |
| Aug 15, 2024 | BSM | ↑ Buy | 34,200 | $14.62 | $500K | Direct | Aug 15, 2024 (0d) |
| Feb 26, 2024 | BSM | ↑ Buy | 3,250 | $15.47 | $50K | Direct | Feb 27, 2024 (1d) |
| Nov 17, 2023 | BSM | ↑ Buy | 44,000 | $17.32 | $762K | Direct | Nov 17, 2023 (0d) |
| Mar 6, 2023 | BSM | ↑ Buy | 31,150 | $15.85 | $494K | Direct | Mar 7, 2023 (1d) |
| Mar 6, 2023 | BSM | ↑ Buy | 3,100 | $15.85 | $49K | By daughter | Mar 7, 2023 (1d) |
| Jun 10, 2019 | BSM | ↑ Buy | 5,350 | $16.44 | $88K | By Donald Mark DeWalch Trust | Jun 12, 2019 (2d) |
| Nov 16, 2018 | BSM | ↑ Buy | 1,175 | $17.06 | $20K | By daughter | Nov 19, 2018 (3d) |
| Jul 30, 2015 | BSM | ↑ Buy | 15 | $14.56 | $218 | By son | Aug 3, 2015 (4d) |
| May 6, 2015 | BSM | ↑ Buy | 2,200 | $19.00 | $42K | Direct | May 8, 2015 (2d) |
| May 6, 2015 | BSM | ↑ Buy | 1,500 | $19.00 | $29K | By son | May 8, 2015 (2d) |
| May 6, 2015 | BSM | ↑ Buy | 1,500 | $19.00 | $29K | By daughter | May 8, 2015 (2d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other BSM insiders
Open-market trades in the last 12 months
About D Mark DeWalch's insider trades
D Mark DeWalch is a director at Black Stone Minerals, L.P. (BSM). Since May 6, 2015, D has reported 13 open-market purchases worth $3.5M and no sales on SEC Form 4. In the last 12 months: 2 buys ($1.5M).
Their filings also include grants and awards (23 filings), conversions (4 filings), other transactions (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every BSM insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.