DeWalch D Mark 4

What Happened
D. Mark DeWalch, a director of Black Stone Minerals, L.P. (BSM), made an open-market purchase of 37,650 common units on May 28, 2026. The weighted-average price reported was $13.21 per unit, for a total consideration of approximately $497,341. This was a purchase (insider buy), not a sale or option exercise.

Key Details

• Transaction date: 2026-05-28
• Transaction type/code: Open market purchase (P)
• Shares acquired: 37,650 common units
• Price: weighted average $13.21; reported per-share prices ranged from $13.19 to $13.205 (see footnote)
• Total value: ~ $497,341
• Shares owned after transaction: Not disclosed in the provided filing excerpt
• Footnote: The reported price is a weighted average; the reporting person will provide a breakdown of the number of units purchased at each separate price upon request (per footnote F1).
• Filing timeliness: No late filing indicated in the provided record.

Context
This was a straight open-market purchase by a company director — a common-form insider buy. The filing does not indicate option exercise, gift, 10b5-1 plan, or tax-withholding actions. Retail investors often view purchases by insiders as a data point of interest, but this summary is factual only and does not infer motive.