Black Stone Minerals, L.P.
Black Stone Minerals, L.P. (BSM) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · BSM · as of Sep 30, 2025
Ownership Breakdown
203
Institutional Holders
▲ 12 vs Q2
$454.39M
Total Inst. Value
▲ $5.39M vs Q2
212.50M
Shares Outstanding
freeFloat 80.35%
34.43M
13F Shares Held
▼ 13.30M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
BSM largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
WILLIAM MARSH RICE UNIVERSITY crude petroleum & natural gas | 5.66M | 2.68% | 2.68% | $74.42B | Oct 31, 2025 | — held |
MORGAN STANLEY crude petroleum & natural gas | 4.52M | 2.14% | 2.14% | $59.46B | May 27, 2026 | ▲ 648.0K |
BANK OF AMERICA CORP /DE/ crude petroleum & natural gas | 2.60M | 1.23% | 1.23% | $34.17B | Feb 3, 2026 | ▲ 56.4K |
INVESTMENT MANAGEMENT ASSOCIATES INC /ADV crude petroleum & natural gas | 1.93M | 91.40% | 91.40% | $25.42B | Nov 6, 2025 | ▲ 356.9K |
PENN DAVIS MCFARLAND INC crude petroleum & natural gas | 1.92M | 90.64% | 90.64% | $25.21B | Oct 21, 2025 | ▲ 66.9K |
NATIXIS crude petroleum & natural gas | 1.46M | 68.83% | 68.83% | $19.14B | Nov 14, 2025 | — held |
BROWN ADVISORY INC crude petroleum & natural gas | 886.9K | 41.90% | 41.90% | $11.65B | Nov 14, 2025 | ▼ 10.0K |
MUDITA ADVISORS LLP crude petroleum & natural gas | 760.9K | 35.94% | 35.94% | $10.00B | Nov 13, 2025 | — held |
CONCORDE FINANCIAL CORP crude petroleum & natural gas | 656.7K | 31.02% | 31.02% | $8.63B | Nov 14, 2025 | ▲ 55.2K |
HIGHTOWER ADVISORS, LLC crude petroleum & natural gas | 608.6K | 28.75% | 28.75% | $8.00B | Nov 7, 2025 | ▼ 47.0K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
23
Increased
+2.05M shares1
New Positions
first time holders15
Decreased
−1.29M shares0
Sold Out
fully exitedNet shares change (top 50)
+761.4K
+2.05M / −1.29M
Net new holders
+9
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
BSM insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
12
Buy transactions
3
Sell transactions
4.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
DeWalch D Mark director | Jun 1, 2026 | Purchase | 36,363 | $13.62 | $495.3K | 631.2K | Form 4 ↗ |
DeWalch D Mark director | May 29, 2026 | Purchase | 36,363 | $13.48 | $490.0K | 594.9K | Form 4 ↗ |
DeWalch D Mark director | May 28, 2026 | Purchase | 37,650 | $13.21 | $497.3K | 431.5K | Form 4 ↗ |
Carter Thomas L Jr Executive Chairman | May 13, 2026 | Purchase | 1,120 | $13.50 | $15.1K | 3.68M | Form 4 ↗ |
Longmaid Ashley J director | May 12, 2026 | Sale | 11,128 | $13.45 | $149.7K | 137.3K | Form 4 ↗ |
Carter Thomas L Jr Executive Chairman | May 12, 2026 | Purchase | 19,154 | $13.48 | $258.1K | 3.68M | Form 4 ↗ |
Carter Thomas L Jr Executive Chairman | May 11, 2026 | Purchase | 25,000 | $13.47 | $336.9K | 3.66M | Form 4 ↗ |
Carter Thomas L Jr Executive Chairman | May 8, 2026 | Purchase | 23,604 | $13.32 | $314.4K | 3.64M | Form 4 ↗ |
Putman Luke Stevens SVP, General Counsel, and Sec | May 5, 2026 | Sale | 29,386 | $13.75 | $404.0K | 702.6K | Form 4 ↗ |
Putman Luke Stevens SVP, General Counsel, and Sec | Apr 6, 2026 | Sale | 29,386 | $14.45 | $424.7K | 732.0K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Black Stone Minerals, L.P. (BSM) is primarily owned by institutional investors, who hold approximately 16.2% of total shares outstanding. Company insiders own approximately 19.65%, while retail and public investors account for the remaining 64.14%.
The largest institutional shareholder of Black Stone Minerals, L.P. is WILLIAM MARSH RICE UNIVERSITY, holding approximately 5.66 million shares — equal to 2.68% of outstanding shares — as of September 30, 2025.
A total of 203 institutional investors currently hold BSM stock, with a combined institutional value of approximately $454,394,957 as of the most recent 13F filing period.
Frequently asked questions
BSM ownershipBlack Stone Minerals, L.P. (BSM) is primarily owned by institutional investors, who hold approximately 16.2% of shares. The largest shareholder is WILLIAM MARSH RICE UNIVERSITY with a 2.68% stake. Company insiders hold 19.65%. Data sourced from SEC Form 13F as of September 30, 2025.