D Mark DeWalch bought $497k of BSM
director at Black Stone Minerals, L.P.. 37,650 shares at an average of $13.21, traded May 28, 2026, filed May 28, 2026.
Score components
- +15RoleDirector
- +18Trade size$497k at market
- +3Relative to holdingsHoldings up 10%
- 0Price contextNear the top of the 52-week range
- 0ClusterNo other insider buying within 14 days
- 0Repeat buyingFirst buy in 90 days
- 0Track recordToo few past buys to judge (0 with prices)
What happened after comparable buys
Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.
Price around the trade, and since
From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™
Rows in this filing
Every transaction in Form 4 0001638259-26-000008, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| May 28, 2026 | POpen-market purchase Common units representing limited partner interests | +37,650 | $13.21 | $497k | 431,495 | May 28, 2026 |
Related signals
Other insiders at Black Stone Minerals, L.P. and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 70Notable | BSMsell Black Stone Minerals, L.P. | James Whitehead director | $28M 2,127,105 shares | -427% | |
| 48Moderate | BSMbuy Black Stone Minerals, L.P. | D Mark DeWalch director | $985k 72,726 shares | +13% | |
| 20Weak | BSMbuy Black Stone Minerals, L.P. | Thomas L Carter Jr Executive Chairman | $15k 1,120 shares | +0% | |
| 34Weak | Black Stone Minerals, L.P. | Ashley J Longmaid director | $150k 11,128 shares | -7% | |
| 44Moderate | BSMbuy Black Stone Minerals, L.P. | Thomas L Carter Jr Executive Chairman | $909k 67,758 shares | +2% | |
| 19Weak | Black Stone Minerals, L.P. | Luke Stevens Putman SVP, General Counsel, and Sec | $404k 29,386 shares | -4% | |
| 12Weak | Black Stone Minerals, L.P. | Luke Stevens Putman SVP, General Counsel, and Sec | $462k 30,276 shares | -4% | |
| 11Weak | Black Stone Minerals, L.P. | Luke Stevens Putman SVP, General Counsel, and Sec | $425k 29,386 shares | -4% | |
| 31Weak | BSMsell Black Stone Minerals, L.P. | Luke Stevens Putman SVP, General Counsel, and Sec | $425k 29,386 shares | -4% | |
| 12Weak | Black Stone Minerals, L.P. | Luke Stevens Putman SVP, General Counsel, and Sec | $462k 30,276 shares | -4% |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.