Black Stone Minerals BSM Insider Ownership

NYSE BSM

$14.57 -0.18 (-1.22%)

As of: Oct 21, 2026 · 3:59 PM EDT

Insider Holdings by Owner

10.16Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

13.05%

▼-1.00% pp QoQ

Shares Held by Insiders

27.76Mn

filed for Sep 2026

▼-7.12% QoQ

Shares Outstanding

212.71Mn

212,710,571 shares

Direct Holdings

8.66Mn

Indirect: 19.10Mn

Net Shares Traded (QoQ)

-2.13Mn

net selling in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 11, 2026

In the last 12 months, insiders at Black Stone Minerals made open-market purchases of $2.41 million (179.25K shares) and open-market sales of $29.54 million (2.23Mn shares).

By number of insiders, Black Stone Minerals saw 2 insiders buy and 3 insiders sell on the open market over the past 12 months.
Among BSM's insiders, D. Mark Dewalch (Director) was the top open-market buyer in the past 12 months, with $1.48 million of stock purchased (110.38K shares) and the latest purchase on June 1, 2026.
Meanwhile, the largest open-market sales of BSM in the past 12 months were by James Whitehead (Director), totaling $28.1 million (2.13Mn shares), most recently on August 6, 2026.
Apart from open-market trades, BSM insiders received 493.03K shares in stock awards, gave up 138.85K shares to cover taxes or exercise prices and gave away 15.9K shares as gifts in the past 12 months.
Business Quant data puts insider holdings in BSM at 27.77Mn shares across insiders' latest Form 4 filings, down 7.10% from 29.89Mn shares at the end of Q2 2026 and down 17.03% from 33.47Mn shares at the end of Q3 2025.
Direct holdings account for 8.66Mn shares (31.20%) of BSM's insider total, and indirect holdings through trusts, partnerships and family members for 19.1Mn shares (68.80%).
BSM's insider total is spread across 17 insiders who have filed a Form 4 in the past two years.
Black Stone Minerals' top three insider holders by shares held are Thomas L. Carter Jr. (Executive Chairman, 15.46Mn shares), Alexander D. Stuart (Director, 5.41Mn shares) and William N. Mathis (Director, 2.27Mn shares).
The holding of Thomas L. Carter Jr. makes up 55.67% of all shares held by Black Stone Minerals insiders.
Institutional investors held 21.07% of Black Stone Minerals stock at the end of Q2 2026, while the latest Form 4 filings of its insiders account for about 13.05%; other investors, including the public, hold roughly 65.88%.
Over the trailing 12 months, 15 insiders reported transactions in BSM stock across 58 Form 4 filings.
The insider data for BSM reflects Form 4 filings through October 5, 2026.

Form 4 Holdings

Insiders Holding BSM

Insiders 21

Shares held 10.16Mn

Of outstanding 4.78%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Thomas L Jr Carter	Executive Chairman	3,682,724	0	3,682,724	36.2%	14 May, 2026
2	Alexander D. Stuart	Director	2,041,733	0	2,041,733	20.1%	05 Oct, 2026
3	Luke Stevens Putman	Svp, General Counsel, And Sec	702,645	0	702,645	6.9%	06 May, 2026
4	James Whitehead	Director	0	646,058	646,058	6.4%	10 Aug, 2026
5	Jeffrey P. Wood	President, Cfo	589,109	0	589,109	5.8%	24 Feb, 2023
6	D Mark Dewalch	Director	434,146	0	434,146	4.3%	05 Oct, 2026
7	Jerry V. Jr. Kyle	Director	323,798	0	323,798	3.2%	05 Oct, 2026
8	William N. Mathis	Director	246,200	0	246,200	2.4%	07 Oct, 2025
9	Michael C Linn	Director	208,150	0	208,150	2.0%	15 Jan, 2026
10	William E. Randall	Director	194,955	0	194,955	1.9%	05 Oct, 2026
11	Carrie Pearson Clark	Svp, Chief Commercial Officer	165,857	0	165,857	1.6%	30 May, 2025
12	Carin Marcy Barth	Director	142,447	0	142,447	1.4%	15 Jan, 2026
13	Taylor Dewalch	Co Ceo And President	141,369	0	141,369	1.4%	26 Feb, 2026
14	Ashley J Longmaid	Director	137,335	0	137,335	1.4%	13 May, 2026
15	Dawn Smajstrla	Vp, Chief Accounting Officer	128,456	0	128,456	1.3%	22 Feb, 2024
16	Fowler Carter	Co Ceo And President	125,379	0	125,379	1.2%	26 Feb, 2026
17	Allison K. Thacker	Director	122,656	0	122,656	1.2%	13 Jan, 2023
18	Evan Montgomery Kiefer	Svp, Cfo Treasurer	65,383	0	65,383	0.6%	22 Feb, 2024
19	Chris Bonner	Svp, Cfo, And Treasurer	50,678	0	50,678	0.5%	26 Feb, 2026
20	Anne Lenoir Hamman	Director	9,737	0	9,737	0.1%	05 Oct, 2026
21	Erin Leah Phillips	Controller (Pao)	3,911	0	3,911	0.0%	06 Feb, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

1,051 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
02 Oct, 2026	D Mark Dewalch	Director	Acquired A	1,309	$14.32	$18.74K	434,146	Direct
02 Oct, 2026	Alexander D. Stuart	Director	Acquired A	1,658	$14.32	$23.74K	2,041,733	Direct
02 Oct, 2026	Anne Lenoir Hamman	Director	Acquired A	1,309	$14.32	$18.74K	9,737	Direct
02 Oct, 2026	Jerry V. Jr. Kyle	Director	Acquired A	1,309	$14.32	$18.74K	323,798	Direct
02 Oct, 2026	William E. Randall	Director	Acquired A	1,571	$14.32	$22.50K	194,955	Direct
18 Aug, 2026	Alexander D. Stuart	Director	Disposed G	15,900	$0.00	$0	2,040,075	Direct
06 Aug, 2026	James Whitehead	Director	Disposed S	498,343	$13.21	$6.58Mn	0	Indirect
06 Aug, 2026	James Whitehead	Director	Disposed S	1,628,762	$13.21	$21.52Mn	646,058	Indirect
31 Jul, 2026	Jerry V. Jr. Kyle	Director	Acquired J	7,665	—	—	7,665	Indirect
02 Jul, 2026	Anne Lenoir Hamman	Director	Acquired A	1,342	$13.97	$18.75K	8,428	Direct
02 Jul, 2026	Alexander D. Stuart	Director	Acquired A	1,700	$13.97	$23.75K	2,055,975	Direct
02 Jul, 2026	Jerry V. Jr. Kyle	Director	Acquired A	1,342	$13.97	$18.75K	322,489	Direct
02 Jul, 2026	William E. Randall	Director	Acquired A	1,610	$13.97	$22.49K	193,384	Direct
02 Jul, 2026	D Mark Dewalch	Director	Acquired A	1,342	$13.97	$18.75K	432,837	Direct
29 May, 2026	D Mark Dewalch	Director	Acquired P	36,363	$13.48	$490.03K	594,885	Indirect
01 Jun, 2026	D Mark Dewalch	Director	Acquired P	36,363	$13.62	$495.33K	631,248	Indirect
28 May, 2026	D Mark Dewalch	Director	Acquired P	37,650	$13.21	$497.34K	431,495	Direct
13 May, 2026	Thomas L Jr Carter	Executive Chairman	Acquired P	1,120	$13.50	$15.12K	3,682,724	Direct
12 May, 2026	Ashley J Longmaid	Director	Disposed S	11,128	$13.45	$149.70K	137,335	Direct
08 May, 2026	Thomas L Jr Carter	Executive Chairman	Acquired P	23,604	$13.32	$314.37K	3,637,450	Direct

Showing 1 to 20 of 1,051 transactions