The insider sales are small relative to market cap and follow option exercises, consistent with routine diversification. No bearish signal.
Price Chart
Executive Summary
CEO Derek Maetzold and CCO Tobin Juvenal sold a combined ~$286K in open-market sales over a 2-day window (July 31–Aug 3), with Maetzold also exercising options for net-zero-cost shares. The total value is ~0.03% of CSTL's $928M market cap — trivial in proportion. The CEO's sales follow option exercises, consistent with tax-planning or diversification, not a bearish signal. The cluster is small, routine, and non-informative per the asymmetric buy/sell calibration (cluster sells are weak predictors).
Key Financial Metrics
Key Facts
- CEO Derek Maetzold sold ~$618K total across July 31 and Aug 3, including shares from option exercises at $0 and $2.39 strike prices
- CCO Tobin Juvenal sold ~$556K total across July 31 and Aug 3
- Total open-market sales: ~$1.2M over the 7-day window, ~0.13% of market cap — modest but not material
- All sales are open-market (code S); option exercises (code M) are non-cash events
- No insider purchases in the cluster — net direction is selling
Financial Impact
Total insider sales of ~$1.2M represent ~0.13% of CSTL's $928M market cap — modest and routine
Risk Factors
- Insider sales could accelerate if the stock rallies further, creating overhead supply
- No insider buying to signal conviction — all selling direction is a mild negative if fundamentals weaken
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-CSTL-1785900947565 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 21, 2026 5d ago | Insider Cluster | $33.19 $33.08 | ▼ −0.33% | ▲ +0.19% | $33.30 (+0.33%) |
Oct 5, 2026 21d ago | 144 | $33.36 $33.00 | ▼ −1.08% | ▼ −0.84% | $33.30 (−0.18%) |
Oct 5, 2026 21d ago | Insider Cluster | $33.36 $33.00 | ▼ −1.08% | ▼ −0.84% | $33.30 (−0.18%) |
Sep 23, 2026 4w ago | Insider Cluster | $35.19 $35.81 | ▼ −1.76% | ▼ −1.22% | $33.30 (+5.37%) |
Sep 16, 2026 5w ago | Insider Cluster | $36.78 $35.34 | ▼ −3.92% | ▼ −4.04% | $33.30 (−9.46%) |
Sep 11, 2026 6w ago | 144 | $33.44 $35.50 | ▲ +6.16% | ▲ +6.62% | $33.30 (−0.42%) |
Sep 3, 2026 7w ago | Insider Cluster | $32.91 $32.76 | ▲ +0.46% | ▼ −0.09% | $33.30 (−1.19%) |
Sep 2, 2026 7w ago | Insider Cluster | $32.65 $32.91 | ▲ +0.80% | ▲ +1.18% | $33.30 (+1.99%) |
Sep 1, 2026 7w ago | Insider Cluster | $33.42 $32.65 | ▼ −2.30% | ▼ −3.35% | $33.30 (−0.36%) |
Aug 27, 2026 8w ago | Insider Cluster | $33.50 $33.03 | ▼ −1.40% | ▼ −1.10% | $33.30 (−0.60%) |
US Market Status
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