Insider · CIK 0001638259
D Mark DeWalch
Files at BSM (Black Stone Minerals, L.P.). First filing May 28, 2026, latest Jun 2, 2026.
In brief
D Mark DeWalch files SEC Form 4 as director at BSM (Black Stone Minerals, L.P.). Since May 28, 2026, D Mark DeWalch has reported 2 open-market buys worth $1.5M and 0 open-market sells worth $0, the latest filed on Jun 2, 2026.
A track record needs three past buys with six months of prices behind them; D Mark DeWalch has 0, so none is measured yet.
The newest scored trade: bought $985k of BSM on May 29, 2026, filed Jun 2, 2026, scored 48 (moderate). In the last 12 months: 2 buys worth $1.5M and 0 sells worth $0.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
BSM: Black Stone Minerals, L.P.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 48Moderate | BSMbuy Black Stone Minerals, L.P. | $985k 72,726 shares | +13% | +24% from low-10% from high | |
| 36Weak | BSMbuy Black Stone Minerals, L.P. | $497k 37,650 shares | +10% | +21% from low-12% from high |
Transactions
Every row this insider has filed, 13 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Oct 2, 2026 | BSM Black Stone Minerals, L.P. | AGrant or award Common units representing limited partner interests | +1,309 | $14.32 | $19k | 434,146 | 8 d ago |
| Jul 2, 2026 | BSM Black Stone Minerals, L.P. | AGrant or award Common units representing limited partner interests | +1,342 | $13.97 | $19k | 432,837 | Jul 2, 2026 |
| May 29, 2026 | BSM Black Stone Minerals, L.P. | POpen-market purchase Common units representing limited partner interestsindirect: By DeWalch Diversified LP | +36,363 | $13.48 | $490k | 594,885 | Jun 2, 2026 |
| Jun 1, 2026 | BSM Black Stone Minerals, L.P. | POpen-market purchase Common units representing limited partner interestsindirect: By DeWalch Diversified LP | +36,363 | $13.62 | $495k | 631,248 | Jun 2, 2026 |
| May 28, 2026 | BSM Black Stone Minerals, L.P. | POpen-market purchase Common units representing limited partner interests | +37,650 | $13.21 | $497k | 431,495 | May 28, 2026 |
| Apr 2, 2026 | BSM Black Stone Minerals, L.P. | AGrant or award Common units representing limited partner interests | +1,240 | $15.12 | $19k | 393,845 | Apr 6, 2026 |
| Jan 13, 2026 | BSM Black Stone Minerals, L.P. | AGrant or award Common units representing limited partner interests | +14,255 | $0.00 | $0 | 392,605 | Jan 15, 2026 |
| Jan 2, 2026 | BSM Black Stone Minerals, L.P. | AGrant or award Common units representing limited partner interests | +1,410 | $13.29 | $19k | 378,350 | Jan 6, 2026 |
| Oct 3, 2025 | BSM Black Stone Minerals, L.P. | AGrant or award Common units representing limited partner interests | +1,426 | $13.14 | $19k | 376,940 | Oct 7, 2025 |
| Jul 3, 2025 | BSM Black Stone Minerals, L.P. | AGrant or award Common units representing limited partner interests | +1,433 | $13.08 | $19k | 375,514 | Jul 3, 2025 |
| Apr 4, 2025 | BSM Black Stone Minerals, L.P. | AGrant or award Common units representing limited partner interests | +1,227 | $15.27 | $19k | 374,081 | Apr 7, 2025 |
| Jan 13, 2025 | BSM Black Stone Minerals, L.P. | AGrant or award Common units representing limited partner interests | +13,324 | $0.00 | $0 | 372,854 | Jan 15, 2025 |
| Jan 3, 2025 | BSM Black Stone Minerals, L.P. | AGrant or award Common units representing limited partner interests | +1,284 | $14.60 | $19k | 359,530 | Jan 7, 2025 |
Questions about D Mark DeWalch
Answered from the filings on this page, as of the latest one.
Is D Mark DeWalch buying or selling?
In the last 12 months D Mark DeWalch reported 2 open-market buys worth $1.5M and 0 open-market sells worth $0 on SEC Form 4; the latest was bought $985k of BSM on May 29, 2026. Grants, option exercises and tax withholding are not counted.
How did D Mark DeWalch's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and D Mark DeWalch has 0.
Where does D Mark DeWalch file Form 4?
D Mark DeWalch has filed Form 4 at BSM (Black Stone Minerals, L.P.). A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
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.