The cluster is tiny relative to market cap and involves only two officers selling on the same day, likely driven by compensation-related option exercises rather than a shared bearish thesis. Monitor upcoming pipeline catalysts (ALPN-202, ALPN-303) and the next 10-Q for cash-runway updates; on low confidence, avoid acting on these insider sales alone.
Price Chart
Executive Summary
Two Shattuck Labs executives—the Chief Medical Officer and Chief Technical Officer—sold a combined $376K of stock in an open-market cluster on June 30, 2026. The CTO also exercised derivative options for $83K in cash value, with most shares sold immediately. Relative to a $499M market cap, this represents 0.075% of shares outstanding—a routine, sub-0.1% proportionality level that is not material. No 10b5-1 pattern is visible, but the trades cluster on the same date, likely triggered by a shared blackout-window opening or compensation-related vesting event rather than informational selling.
Key Financial Metrics
Key Facts
- Two C-suite insiders sold stock simultaneously on June 30, 2026
- Total open-market sales: $376,131 (0.075% of $499M market cap)
- CTO exercised 23,365 option shares for $83,413 cash; sold the same number same-day at $7.08
- CMO sold 30,000 shares at $7.01, a ~$210K transaction
- No purchases by any insider in the window
Financial Impact
Total insider sales of $376K represent 0.075% of market cap—well below the 0.1% proportionality threshold. Routine non-informative cluster.
Risk Factors
- No insider buying to counterbalance the selling pressure
- Shelf-registration (S-3) presence historically amplifies cluster events → potential future dilution
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-STTK-1783037865885 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 27, 2026 today | SC 13G | $5.55 | awaiting T+5 | — | $5.77 (+3.96%) |
Aug 11, 2026 11w ago | 8-K | $7.18 $7.45 | ▲ +3.76% | ▲ +4.16% | $5.77 (−19.64%) |
Aug 11, 2026 11w ago | Press Release | $7.18 $7.45 | ▲ +3.76% | ▲ +4.16% | $5.77 (−19.64%) |
Jul 7, 2026 15w ago | Insider Cluster | $6.88 $6.29 | ▼ −8.58% | ▼ −9.44% | $5.77 (−16.13%) |
Jul 2, 2026 16w ago | Insider Cluster | $7.05 $7.03 | ▼ −0.28% | ▼ −1.21% | $5.77 (−18.16%) |
Jun 11, 2026 19w ago | 8-K | $4.18 $4.74 | ▼ −13.40% | ▼ −12.96% | $5.77 (−38.04%) |
Jun 11, 2026 19w ago | Institutional Cluster | $4.18 $4.74 | ▼ −13.40% | ▼ −12.96% | $5.77 (−38.04%) |
Jun 11, 2026 19w ago | 424B5 | $4.18 $4.74 | ▼ −13.40% | ▼ −12.96% | $5.77 (−38.04%) |
Jun 10, 2026 19w ago | Press Release | $4.13 $4.33 | ▼ −4.84% | ▼ −1.41% | $5.77 (−39.71%) |
Jun 9, 2026 20w ago | 424B5 | $4.13 $4.33 | ▼ −4.84% | ▼ −1.41% | $5.77 (−39.71%) |
US Market Status
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