Insider sales are trivial in size relative to market cap and concentrated within a narrow window. Monitor for any upcoming corporate event (earnings, pipeline data) that may have prompted routine portfolio adjustments, but this cluster alone does not warrant a directional trade.
Price Chart
Executive Summary
Three C-suite insiders at Alector (ALEC) sold a total of $285K in open-market sales over a 7-day window, including the CEO, CFO, and principal accounting officer. At a $280M market cap, the total represents ~0.1% of market cap — a routine, immaterial amount that does not suggest informed selling, particularly given the asymmetric weak predictive power of cluster sells per academic literature.
Key Financial Metrics
Key Facts
- CEO Arnon Rosenthal sold 72,606 shares for $193K on 2026-09-03
- CFO Neil Berkley sold 29,251 shares for $78K on 2026-09-03
- Principal Accounting Officer Grace Wong-Sarad sold three lots totaling 9,446 shares for ~$25K over 2026-09-02 to 2026-09-04
- Total cluster value: ~$285K, representing ~0.1% of ALEC's $280M market cap
- All trades were open-market sales (code S) — no 10b5-1 pattern identified in this window
Financial Impact
$285K total insider sales, ~0.1% of $280M market cap
Risk Factors
- C-suite insiders selling simultaneously could reflect broader bearish sentiment not captured by dollar value alone
- ALEC is a pre-revenue biotech; any negative pipeline catalyst could amplify downside beyond what insider activity suggests
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-ALEC-1788559301180 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 26, 2026 today | SC 13G | — | awaiting T+60 | — | — |
Oct 23, 2026 3d ago | SC 13G | $1.84 | awaiting T+60 | — | $1.83 (−0.33%) |
Oct 16, 2026 10d ago | 424B5 | $1.95 | awaiting T+60 | — | $1.83 (+6.15%) |
Oct 16, 2026 10d ago | 8-K | $1.95 | awaiting T+60 | — | $1.83 (+6.15%) |
Oct 14, 2026 12d ago | 8-K | $1.88 | awaiting T+60 | — | $1.83 (−2.66%) |
Oct 5, 2026 21d ago | 8-K | $1.99 | awaiting T+60 | — | $1.83 (−8.04%) |
Oct 5, 2026 21d ago | Press Release | $1.99 | awaiting T+60 | — | $1.83 (−8.04%) |
Sep 18, 2026 5w ago | SC 13G | $1.93 | awaiting T+60 | — | $1.83 (−5.18%) |
Sep 4, 2026 7w ago | Insider Cluster | $2.47 | awaiting T+60 | — | $1.83 (−25.91%) |
Aug 15, 2026 10w ago | Institutional Cluster | $2.05 | awaiting T+60 | — | $1.83 (−10.73%) |
US Market Status
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