ALEC — Alector, Inc.
Price · 2024-08-26 → 2026-08-21
499 daily closes shownAnonymous view is capped at two years of history. A free account extends it to five, and Pro opens the whole archive back to 2019-02-07.
Performance
Technicals
Others in Healthcare
Measured signals that fired on ALEC
| date | signal | measured base rate |
|---|---|---|
| 2026-06-03 | Cluster sale: three or more insiders insider | -0.37% over 21 days · t = -3.38 · n = 21,542 statistically distinguishable from its control group |
| 2026-05-15 | Short volume far above its own normal short | -0.76% over 21 days · t = -2.79 · n = 5,897 statistically distinguishable from its control group |
| 2026-03-03 | Cluster sale: three or more insiders insider | -0.37% over 21 days · t = -3.38 · n = 21,542 statistically distinguishable from its control group |
Excess return against a matched control group, on a point-in-time universe that includes delisted companies. Most families do not survive that. How the measurement works →
Insider transactions (Form 4)
| date | insider | what | shares | price | value |
|---|---|---|---|---|---|
| 2026-08-19 | Rosenthal Arnon Chief Executive Officer | Gift | 350.0K | 0.00 | 0 |
| 2026-08-19 | Rosenthal Arnon Chief Executive Officer | Gift | 350.0K | 0.00 | 0 |
| 2026-08-19 | Rosenthal Arnon Chief Executive Officer | Gift | 350.0K | 0.00 | 0 |
| 2026-08-19 | Rosenthal Arnon Chief Executive Officer | Gift | 1.1M | 0.00 | 0 |
| 2026-07-09 | Wong-Sarad Grace Principal Accounting Officer | Grant or award | 20.0K | 0.00 | 0 |
| 2026-06-17 | DESOUZA ERROL B Director | Grant or award | 28.7K | 0.00 | 0 |
| 2026-06-17 | Hammond Paula Director | Grant or award | 28.7K | 0.00 | 0 |
| 2026-06-17 | SCHELLER RICHARD H Director | Grant or award | 28.7K | 0.00 | 0 |
| 2026-06-17 | Altmeyer Mark Director | Grant or award | 28.7K | 0.00 | 0 |
| 2026-06-17 | LAVIGNE LOUIS J JR Director | Grant or award | 28.7K | 0.00 | 0 |
Open-market purchases (code P) are the informative ones. Grants, option exercises and tax withholding are compensation mechanics, not decisions. How to read a Form 4 →
Largest institutional holders
| manager | value | shares |
|---|---|---|
| TCG Crossover Management, LLC | 21.5M | 10.0M |
| BlackRock, Inc. | 16.6M | 7.7M |
| Foresite Capital Management IV, LLC | 8.4M | 3.9M |
| VANGUARD CAPITAL MANAGEMENT LLC | 7.9M | 3.7M |
| Merck & Co., Inc. | 7.6M | 3.5M |
| D. E. Shaw & Co., Inc. | 7.2M | 3.3M |
| 683 Capital Management, LLC | 6.9M | 3.2M |
| Balyasny Asset Management L.P. | 6.3M | 2.9M |
| Nantahala Capital Management, LLC | 6.1M | 2.8M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.6M | 2.6M |
13F positions as of 2026-03-31, filed up to 45 days after quarter end. Long-only US equity — shorts and derivatives never appear. What 13F does and does not show →
Short selling
This is off-exchange short volume, not short interest: it is flow, not position, and 40–50% is normal because market makers short to fill your buy. Why that number misleads →
Ask the AI about ALEC
The assistant reads every block on this page — price history, filings, insider transactions, institutional positions, short volume, macro and the measured base rates — and says what it implies, quoting the number behind each claim and declaring what it does not have.
Everything on this page is live in the terminal.
Charts, filings, insider flow and the AI — open without an account.
Free plan for good. Pro is $69.99/mo, or $4.99 for a 7-day trial. See the plans →