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DD
Insider

D Mark DeWalch

Director

D Mark DeWalch (Director) filed 2 Form 4 reports in the trailing twelve months (2 purchases, 0 sales), most often in Black Stone Minerals, L.P. (BSM). Across 2 priced purchase filings, the average 21-session return was +5.2% from execution and +2.9% from disclosure (delay-adjusted; derived). The largest single filing was $985K of BSM (72,726 sh across 2 lots, as filed), executed May 29.

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Return, ttmiAverage return per filing, trailing twelve months
+5.2%
avg across 2 priced filings
Delay-adjustediThe same average, entered at disclosure dates
+2.9%
same 2 filings, from disclosure
Filings, ttm
2
2 buys · 0 sells
Median delay
2d
execution → disclosure
Volume, ttmiDollar value disclosed in the trailing twelve months
$1.5M
shares × price, as filed
Last traded
Jun 1
Filed Jun 2

Median ADV $5.4M across their filed names

Open performance
Volume by month
$985K$493K$0Oct 2024Apr 2025Oct 2025Apr 2026May 2026 · buys $497KJun 2026 · buys $985K
Buys $1.5M Sells $0

Shares × price, as filed · by filing month · past 24 months

Sectors filed on
Energy 2 filings

Sector per market data · by filing · past 12 months

Most traded names
BSM Black Stone Minerals, L.P. BSM · 2 buys · 0 sells 2 filings
Recent filings
BSMPURCHASE Black Stone Minerals, L.P. View filing → $985K
72,726 sh across 2 lots
Exec May 29
Filed Jun 2 · 4:32 PM ET
BSMPURCHASE Black Stone Minerals, L.P. View filing → $497K
37,650 sh × $13.21
Exec May 28
Filed May 28 · 5:09 PM ET