BSM insider buying
2 cluster buysBlack Stone Minerals, L.P. · Energy
When two or more insiders at Black Stone Minerals, L.P. buy BSM on the open market around the same time, that clustered conviction is one of the highest-signal patterns in SEC filing data. Below is every cluster we've detected in BSM plus the full record of qualifying open-market buys, each parsed directly from Form 4 filings and linked back to the source on SEC EDGAR.
Detected clusters
- May 8 – Jun 1, 2026Detected Jun 1, 20262 insidersTotal bought$2.4MMarket cap$2.9B
- Aug 15 – Sep 6, 2024Detected Sep 6, 2024High conviction2 insidersTotal bought$1.9MMarket cap$2.9B
All notable open-market buys in BSM
Every open-market Form 4 purchase, newest first. Click an insider to see their full buying record across companies.
| Date | Insider | Shares | Price | Value | Filing |
|---|---|---|---|---|---|
| Jun 1, 2026 | DeWalch D Markcluster Director | 36,363 | $13.62 | $495.3K | SEC ↗ |
| May 29, 2026 | DeWalch D Markcluster Director | 36,363 | $13.48 | $490.0K | SEC ↗ |
| May 28, 2026 | DeWalch D Markcluster Director | 37,650 | $13.21 | $497.3K | SEC ↗ |
| May 12, 2026 | Carter Thomas L Jrcluster Director, Executive Chairman | 19,154 | $13.48 | $258.1K | SEC ↗ |
| May 11, 2026 | Carter Thomas L Jrcluster Director, Executive Chairman | 25,000 | $13.47 | $336.9K | SEC ↗ |
| May 8, 2026 | Carter Thomas L Jrcluster Director, Executive Chairman | 23,604 | $13.32 | $314.4K | SEC ↗ |
| Sep 12, 2025 | Director, CEO, President, and Chairman | 14,000 | $12.59 | $176.3K | SEC ↗ |
| Sep 10, 2025 | Director, CEO, President, and Chairman | 10,536 | $12.32 | $129.8K | SEC ↗ |
| Sep 8, 2025 | Director, CEO, President, and Chairman | 13,527 | $11.90 | $161.0K | SEC ↗ |
| Aug 20, 2025 | Director, CEO, President, and Chairman | 21,000 | $12.03 | $252.6K | SEC ↗ |
| Aug 19, 2025 | Director, CEO, President, and Chairman | 20,000 | $11.97 | $239.4K | SEC ↗ |
| Aug 12, 2025 | Director, CEO, President, and Chairman | 9,200 | $12.36 | $113.7K | SEC ↗ |
| Aug 11, 2025 | Director, CEO, President, and Chairman | 25,000 | $12.10 | $302.5K | SEC ↗ |
| Aug 8, 2025 | Director, CEO, President, and Chairman | 27,500 | $12.20 | $335.5K | SEC ↗ |
| Aug 7, 2025 | Director, CEO, President, and Chairman | 19,710 | $12.24 | $241.3K | SEC ↗ |
| May 21, 2025 | Director, CEO, President, and Chairman | 14,500 | $13.52 | $196.0K | SEC ↗ |
| Sep 6, 2024 | Carter Thomas L Jrcluster Director, CEO, President, and Chairman | 100,000 | $14.12 | $1.4M | SEC ↗ |
| Aug 15, 2024 | DeWalch D Markcluster Director | 34,200 | $14.62 | $500.0K | SEC ↗ |
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BSM insider buying — FAQ
- Are insiders buying BSM stock?
- Yes — 2 distinct insiders have bought BSM (Black Stone Minerals, L.P.) on the open market, including 2 cluster buys where two or more insiders bought within a rolling window. The most recent qualifying activity was Jun 2, 2026.
- How much BSM stock have insiders bought?
- Insiders have bought a combined $6.5M of BSM across 18 open-market purchases, based on SEC Form 4 filings.
- What is an insider cluster buy in BSM?
- A cluster buy is two or more distinct Black Stone Minerals, L.P. insiders — officers, directors, or 10% owners — each buying BSM on the open market within a rolling window. BSM has 2 detected cluster buys to date.
- Where does this BSM insider trading data come from?
- Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.
How we track insider buying in BSM
We continuously poll SEC EDGAR for new Form 4 filings and parse every open-market purchase (transaction code P). A cluster is recorded when two or more distinct insiders — officers, directors, or 10% owners — each buy BSM within a rolling window. We track clusters at every company size, from micro-caps to mega-caps. Every figure on this page traces back to an official filing; open any row to jump straight to the source document. What counts as a cluster buy?
This page is informational and reflects public filing data. It is not investment advice or a recommendation regarding BSM.