The Chairman's $909K buying spree is notable for a $2.9B MLP, but the simultaneous selling by the GC and a director neutralizes the signal. Per academic literature, cluster buys are more informative than cluster sells, but the dollar amount is too small to drive stock movement. Monitor for any 8-K or earnings release in the next 30 days that could explain the Chairman's conviction. The cross-filing amplifiers suggest this cluster gains significance if paired with a late filing, offering, or press release — none are present here.
Price Chart
Executive Summary
Black Stone Minerals insiders traded $812K in a mixed cluster over 7 days. Executive Chairman Carter bought $909K across three open-market purchases (May 8-12), while SVP/GC Putman sold $404K and Director Longmaid sold $150K. The Chairman's sustained buying at ~$13.32-$13.48 signals conviction, but the insider selling by senior legal and board members creates a conflicting signal. Total open-market activity is ~0.03% of BSM's $2.9B market cap, well below the 0.1% materiality threshold, making this a routine cluster despite the Chairman's purchases.
Key Financial Metrics
Key Facts
- Executive Chairman Thomas Carter Jr. purchased 67,758 shares total (~$909K) across three open-market buys on May 8, 11, and 12 at ~$13.32-$13.48.
- SVP/GC Luke Putman sold 29,400 shares ($404K) on May 5 — the largest single trade in the cluster.
- Director Ashley Longmaid sold 11,128 shares ($150K) on May 12, the same day Carter bought.
- Total open-market cluster value is ~$1.06M (buys $909K + sells $554K), representing ~0.04% of BSM's $2.9B market cap.
- The cluster includes both C-suite (Chairman buying) and senior legal (SVP/GC selling), creating a mixed directional signal.
Financial Impact
Total insider activity of ~$1.06M is 0.04% of market cap — immaterial relative to company size.
Risk Factors
- SVP/GC selling $404K could indicate internal concerns about legal/regulatory matters not yet public.
- Director selling on the same day as Chairman buying creates a mixed signal that reduces conviction.
- The cluster value is too small relative to market cap to be a reliable directional indicator.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-BSM-1778708827954 |
Track record builds as more directional reports settle.
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Jun 24, 2026 17w ago | Institutional Cluster | $14.16 $14.80 | ▲ +4.52% | ▲ +1.68% | $14.85 (+4.87%) |
May 5, 2026 25w ago | Insider Cluster | $13.38 $14.80 | ▲ +10.59% | ▲ +7.85% | $14.85 (+10.96%) |
US Market Status
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