BSM Black Stone Minerals, L.P.

NYSE
$14.99

Black Stone Minerals, L.P. (BSM) Insider Activity

What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.

30D 90D 6M 1Y
Insider signal In line Selling ran in line with BSM's own trailing one-year pace, with 4% of sale value under a prearranged plan.
Cluster activity 0 buyers in the last 30 days 0 buyers in the last 90 days 1 seller in the last 90 days
Insiders buying
2
9 transactions
Insiders selling
3
8 transactions
Purchases
$2.6M
194,554 shares
Sales
$30.4M
2,286,943 shares
Net activity
-$27.8M
purchases less sales

How much of that selling was preplanned? 4% planned / 96% discretionary

10b5-1 plan sales $1.3M 3 transactions · 89,048 shares
Discretionary sales $29.1M 5 transactions · 2,197,895 shares

Largest single sale: $21.5M.

Where they traded

Buy Sell Dot area is proportional to transaction value.

Last open-market purchase: June 1, 2026 , by DeWalch D Mark .

Recent open-market activity

Date Insider Role Action Shares Price Value Held after
Whitehead James 2 fills Director Sell 2,127,105 $13.21 $28.1M 646,058 −76.7% of holding
DeWalch D Mark Director Buy 36,363 $13.62 $495.3K 631,248
DeWalch D Mark Director Buy 36,363 $13.48 $490.0K 594,885
DeWalch D Mark Director Buy 37,650 $13.21 $497.3K 431,495
Carter Thomas L Jr Executive Chairman Buy 1,120 $13.50 $15.1K 3,682,724
Carter Thomas L Jr Executive Chairman Buy 19,154 $13.48 $258.1K 3,681,604
Longmaid Ashley J Director Sell 11,128 $13.45 $149.7K 137,335 −7.5% of holding
Carter Thomas L Jr Executive Chairman Buy 25,000 $13.47 $336.9K 3,662,450
Carter Thomas L Jr Executive Chairman Buy 23,604 $13.32 $314.4K 3,637,450
Putman Luke Stevens SVP, General Counsel, and Sec Sell 10b5-1 29,386 $13.75 $404.0K 702,645 −4% of holding
Putman Luke Stevens SVP, General Counsel, and Sec Sell 29,386 $14.45 $424.7K 732,031 −3.9% of holding
Putman Luke Stevens SVP, General Counsel, and Sec Sell 10b5-1 29,386 $14.45 $424.7K 732,031 −3.9% of holding
Putman Luke Stevens SVP, General Counsel, and Sec Sell 30,276 $15.25 $461.6K 761,417 −3.8% of holding
Putman Luke Stevens SVP, General Counsel, and Sec Sell 10b5-1 30,276 $15.25 $461.6K 761,417 −3.8% of holding
Carter Thomas L Jr CEO, President, and Chairman Buy 14,000 $12.59 $176.2K 3,512,701

Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.