Company profile
Alector, Inc. Insider Trading
ALECEvery SEC Form 4 insider trading filing for Alector, Inc. (ALEC) since April 2023 — open-market buys and sells by directors and officers, option exercises, and cluster activity, updated as each filing is reported to the SEC. Why 2023?
- Exchange
- Nasdaq
- Sector
- Biological Products, (No Diagnostic Substances)
- CIK
- 0001653087
- Filings
- 118
- Insiders
- 21
- Last filing
- 2026-08-19
Activity summary
No discretionary insider buying or selling in the last 30 days. The 4 transactions filed were grants, option exercises or other non-open-market activity.
Three year balance
Buy and sell value by quarter, Q4 23 to Q3 26. Alector, Inc. insiders are net sellers across the period shown.
Bars below the rule are sales, above are purchases. Largest quarter on the chart is $581K.
90 day insight
Over the last 90 days, Alector, Inc. insiders bought $0 (16 transactions) and sold $222K (3 transactions).
- Most active insider: Rosenthal Arnon with 5 transactions totaling $172K.
- Largest single sale: $172K by Rosenthal Arnon on Jun 2, 2026.
- 25% of recent sales were pre-scheduled 10b5-1 trades — typically less informative than open-market activity.
Activity skews bullish — buys outpace sales.
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 19, 2026 | Rosenthal Arnon | ALEC | Gift | 1,050,000 | — | — |
| Aug 19, 2026 | Rosenthal Arnon | ALEC | Gift | 350,000 | — | — |
| Aug 19, 2026 | Rosenthal Arnon | ALEC | Gift | 350,000 | — | — |
| Aug 19, 2026 | Rosenthal Arnon | ALEC | Gift | 350,000 | — | — |
| Jul 9, 2026 | Wong-Sarad Grace | ALEC | Award | 20,000 | — | — |
45 more transactions hidden
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Query this yourself
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-H "X-Api-Key: $KEY"Top insiders
By total value filed.
Institutional Ownership
Top 13F-HR holders of Alector, Inc. as of 2026-06-30
Data source: quarterly 13F-HR filings — institutional holders report positions within 45 days of quarter end. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →