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

Last 12 months

Insiders bought $2.41M and sold $29.5M on the open market.

4% of the selling was scheduled in advance under 10b5-1 plans. Director James Whitehead sold $28.1M on Aug 6, 34% of their stake, outside a plan.

Net open-market

−$27.1M

4 buys · 5 sales

Under a 10b5-1 plan

of the value sold

Insiders who bought / sold

2 / 3

executives and directors

Last open-market buy

Jun 2026

Jun 1, 2026

Get an email when BSM's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Aug 6	James Whitehead Director	SoldNo plan 2 parts	2,127,105	$13.21 average	$28.1M	34%	Form 4
May 29 – Jun 1	D Mark Dewalch Director	Bought 2 parts	72,726	$13.55 average	$985k	7.0%	Form 4
May 28	D Mark Dewalch Director	Bought	37,650	$13.21	$497k	3.8%	Form 4
May 13	Thomas L Carter Jr Executive Chairman	Bought	1,120	$13.50	$15k	<0.1%	Form 4
May 12	Ashley J Longmaid Director	SoldNo plan	11,128	$13.45	$150k	7.5%	Form 4
May 8 – 12	Thomas L Carter Jr Executive Chairman	Bought 3 parts	67,758	$13.42 average	$909k	1.9%	Form 4
May 5	Luke Stevens Putman SVP, General Counsel, and Sec	Sold10b5-1 plan	29,386	$13.75	$404k	4.0%	Form 4
Apr 6	Luke Stevens Putman SVP, General Counsel, and Sec	Sold10b5-1 plan	29,386	$14.45	$425k	3.9%	Form 4
Mar 5	Luke Stevens Putman SVP, General Counsel, and Sec	Sold10b5-1 plan	30,276	$15.25	$462k	3.8%	Form 4
Sep 11, 2025 – Sep 12, 2025	Thomas L Carter Jr CEO, President, and Chairman	Bought 2 parts	15,300	$12.57 average	$192k	0.1%	Form 4
Sep 8, 2025 – Sep 10, 2025	Thomas L Carter Jr CEO, President, and Chairman	Bought 3 parts	25,370	$12.08 average	$307k	0.2%	Form 4
Aug 19, 2025 – Aug 20, 2025	Thomas L Carter Jr CEO, President, and Chairman	Bought 2 parts	41,000	$12.00 average	$492k	0.3%	Form 4
Aug 12, 2025	Thomas L Carter Jr CEO, President, and Chairman	Bought	9,200	$12.36	$114k	<0.1%	Form 4
Aug 7, 2025 – Aug 11, 2025	Thomas L Carter Jr CEO, President, and Chairman	Bought 3 parts	72,210	$12.18 average	$879k	0.5%	Form 4
May 29, 2025	Carrie Pearson Clark SVP, Chief Commercial Officer	SoldNo plan	36,900	$13.56	$500k	18%	Form 4
May 21, 2025	Thomas L Carter Jr CEO, President, and Chairman	Bought	14,500	$13.52	$196k	<0.1%	Form 4

Aug 6No plan
James Whitehead
Director · sold 2,127,105 at avg $13.21
$28.1M
34% of stake
May 29 – Jun 1
D Mark Dewalch
Director · bought 72,726 at avg $13.55
$985k
7.0% of stake
May 28
D Mark Dewalch
Director · bought 37,650 at $13.21
$497k
3.8% of stake
May 13
Thomas L Carter Jr
Executive Chairman · bought 1,120 at $13.50
$15k
<0.1% of stake
May 12No plan
Ashley J Longmaid
Director · sold 11,128 at $13.45
$150k
7.5% of stake
May 8 – 12
Thomas L Carter Jr
Executive Chairman · bought 67,758 at avg $13.42
$909k
1.9% of stake
May 510b5-1 plan
Luke Stevens Putman
SVP, General Counsel, and Sec · sold 29,386 at $13.75
$404k
4.0% of stake
Apr 610b5-1 plan
Luke Stevens Putman
SVP, General Counsel, and Sec · sold 29,386 at $14.45
$425k
3.9% of stake
Mar 510b5-1 plan
Luke Stevens Putman
SVP, General Counsel, and Sec · sold 30,276 at $15.25
$462k
3.8% of stake
Sep 11, 2025 – Sep 12, 2025
Thomas L Carter Jr
CEO, President, and Chairman · bought 15,300 at avg $12.57
$192k
0.1% of stake
Sep 8, 2025 – Sep 10, 2025
Thomas L Carter Jr
CEO, President, and Chairman · bought 25,370 at avg $12.08
$307k
0.2% of stake
Aug 19, 2025 – Aug 20, 2025
Thomas L Carter Jr
CEO, President, and Chairman · bought 41,000 at avg $12.00
$492k
0.3% of stake
Aug 12, 2025
Thomas L Carter Jr
CEO, President, and Chairman · bought 9,200 at $12.36
$114k
<0.1% of stake
Aug 7, 2025 – Aug 11, 2025
Thomas L Carter Jr
CEO, President, and Chairman · bought 72,210 at avg $12.18
$879k
0.5% of stake
May 29, 2025No plan
Carrie Pearson Clark
SVP, Chief Commercial Officer · sold 36,900 at $13.56
$500k
18% of stake
May 21, 2025
Thomas L Carter Jr
CEO, President, and Chairman · bought 14,500 at $13.52
$196k
<0.1% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch BSM, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in BSM's SEC filings or

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Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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