Alector, Inc.
ALEC- Exchange
- Nasdaq
- Industry
- Biological Products, (No Diagnostic Substances)
- SEC CIK
- 0001653087
In the last 90 days, Alector, Inc. insiders filed 0 open-market purchases and 3 sales; 140 institutions reported holding it in 13F filings for Q2 2026, worth $183.4M in total; no superinvestor holds it.
Key figures
- Market capClose on Nov 10, 2026
- $376.7M
- Insider buysOpen market, last 90 days
- 0
- Insider sellsLast 90 days, $296.1K in total
- 3
- 13F holdersQ2 2026, +4 vs. previous quarter
- 140
- 13F valueReported value at the end of Q2 2026
- $183.4M
- Superinvestors holdingAt the end of Q2 2026
- 0
Price chart
Financials
See financial statementsFrom SEC filings, in USD.
- Revenue, FY2025
- $21.0M
- −79.1% year over year
- Net income, FY2025
- -$142.9M
- No comparable prior period
- Free cash flow, FY2025
- -$184.1M
- No comparable prior period
- Revenue, Q3 FY2026
- $162.9M
- +4,895.9% year over year
Revenue flow, FY2025
Green is profit; orange is costs, expenses and taxes. Percentages are shares of revenue.
Net loss for FY2025: $142.9M (679.2% of revenue).
Short interest
See short dataFrom FINRA, settlement date Oct 30, 2026.
- Short interest
- 8.39M
- Shares sold short
- Change
- −1.86M
- −18.2% vs. previous
- Days to cover
- 3.62
- At average daily volume
Superinvestors holding ALEC, Q2 2026
Go to the superinvestors tabNo superinvestor reported holding ALEC at the end of Q2 2026.
Latest insider trades
See all insider tradesOpen-market purchases and sales by Alector, Inc. insiders from Form 4, newest first.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Sep 4, 2026 (view filing)5:45 PM ET | Sep 2-4 | 2 days | Wong-Sarad GracePrincipal Accounting Officer | SSale | −9.45K | $2.61 | −$24.7K | −8.2%106.0K after | 3 lots |
| Sep 4, 2026 (view filing)5:45 PM ET | Sep 3 | 1 day | Berkley Neil LindsayCFO & Chief Business Officer | SSale | −29.3K | $2.66 | −$77.9K | −7.7%350.6K after | |
| Sep 4, 2026 (view filing)5:45 PM ET | Sep 3 | 1 day | Rosenthal ArnonChief Executive Officer | SSale | −72.6K | $2.66 | −$193.5K | −3.1%2.29M after | |
| Jun 3, 2026 (view filing) | Jun 2 | 1 day | Rosenthal ArnonChief Executive Officer | SSale | −87.2K | $1.97 | −$171.8K | −3.6%2.37M after | |
| Jun 3, 2026 (view filing) | Jun 2-3 | 1 day | Wong-Sarad GracePrincipal Accounting Officer | SSale | −9.18K | $1.94 | −$17.8K | −8.8%95.5K after | 2 lots |
| Jun 3, 2026 (view filing) | Jun 2 | 1 day | Berkley Neil LindsayCFO & Chief Business Officer | SSale | −19.4K | $1.97 | −$38.1K | −4.8%379.9K after | |
| Apr 17, 2026 (view filing) | Apr 16 | 1 day | Wong-Sarad GracePrincipal Accounting Officer | SSale | −1.82K | $2.65 | −$4.82K | −1.7%104.6K after | 10b5-1 |
| Mar 12, 2026 (view filing) | Mar 10 | 2 days | Wong-Sarad GracePrincipal Accounting Officer | SSale | −1.00K | $2.65 | −$2.65K | −0.9%106.5K after | 10b5-1 |
| Mar 3, 2026 (view filing) | Mar 2 | 1 day | Berkley Neil LindsayCFO & Chief Business Officer | SSale | −29.6K | $2.12 | −$62.9K | −7.9%344.7K after | |
| Mar 3, 2026 (view filing) | Mar 3 | Same day | Wong-Sarad GracePrincipal Accounting Officer | SSale | −3.37K | $2.08 | −$7.00K | −3.0%107.5K after | 10b5-1 |
Top 10 13F holders, Q2 2026
See all 140 holdersThe largest institutional positions in Alector, Inc. at the end of Q2 2026; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| TCG Crossover Management, LLC | 10,000,000 | $20.1M | 0.48% | 00.0% | Unchanged |
| BlackRock, Inc. | 7,847,879 | $15.8M | 0.00% | +106,634+1.4% | Added |
| Acadian Asset Management LLC | 4,414,345 | $8.86M | 0.01% | +375,560+9.3% | Added |
| Nantahala Capital Management, LLC | 4,318,109 | $8.68M | 0.52% | +1,502,126+53.3% | Added |
| Vanguard Capital Management LLC | 4,009,340 | $8.06M | 0.00% | +330,618+9.0% | Added |
| Kynam Capital Management, LP | 3,808,494 | $7.66M | 0.42% | +1,808,494+90.4% | Added |
| Merck & Co., Inc. | 3,545,719 | $7.13M | 1.35% | 00.0% | Unchanged |
| Balyasny Asset Management LLC | 3,247,426 | $6.53M | 0.01% | +312,173+10.6% | Added |
| 683 Capital Management, LLC | 3,200,000 | $6.43M | 0.59% | 00.0% | Unchanged |
| D. E. Shaw & Co., Inc. | 2,959,983 | $5.95M | 0.00% | −372,852−11.2% | Reduced |
Holders of 5% or more of ALEC
See all 6 holders and filingsHolders whose latest Schedule 13D or 13G filing reports 5% or more of Alector, Inc..
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| TCG Crossover GP II, LLC | 13G | 9.20%10.0M shares | New | Nov 14, 20251 filing | Nov 14, 2025 | SEC |
| Deep Track Capital, LP | 13G | 8.61%12.8M shares | New | Oct 23, 20261 filing | Oct 23, 2026 | SEC |
| Biotechnology Value Fund L P | 13G | 8.40%9.37M shares | New | Sep 18, 20261 filing | Sep 18, 2026 | SEC |
| Rosenthal Arnon | 13G/A | 7.40%8.21M shares | – | Feb 14, 20224 filings | Feb 6, 2026 | SEC |
| BlackRock, Inc. | 13G | 5.20%5.78M shares | +0.50 ppfrom 4.70% | Apr 17, 20254 filings | Apr 27, 2026 | SEC |