D. Mark DeWalch

D. Mark DeWalch (board member) discloses dealings in Black Stone Minerals, L.P. to SEC (Form 4). We count 24 filings; the first trade dates from 12 January 2016 and the latest from 2 October 2026.

Every open-market trade on record is a purchase: 7 purchases worth €2.6M, and no sale. Buying on the open market means paying the going price with one's own funds, a different act from receiving shares as pay. Outside the open market, there are 17 share grants. In 2026 alone, the filings show 3 purchases and no sales.

The median purchase comes to €426k. As a share of market capitalisation, the median purchase stands at 0.015%, based on 3 purchases. Of 7 purchases, 5 formed part of a group of insiders buying within 30 days of each other. A cluster is several different insiders buying the same stock within a short window, a pattern studied more closely than a single purchase. For 5 purchases whose 90-day window has closed, the share price was higher on day 90 than the day after publication in 80% of cases, with a median move of +7.0%. Past outcomes like these are no guarantee of what comes next.

Most recently, on 5 October 2026, the filings show a share grant worth €17k in Black Stone Minerals, L.P. The most recent open-market purchase was published on 2 June 2026, 138 days ago. Between a trade and the moment it shows up on SEC (Form 4), the median delay is 3 days. US insiders must file a Form 4 within two business days of a trade. This summary is built from SEC (Form 4) disclosures alone and does not predict where the share price will go.