Alector, Inc.
ALECFigures shown here come from public SEC filings. Dates beside each section show the available history.
How Alector, Inc. Makes Money
Follow each dollar of revenue through to what shareholders keep.
From revenue to net income
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Financial Summary
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SEC filings supply these figures; updates after the dates shown are not included. This page includes 9 annual periods. The latest annual period ends Dec 31, 2025. The latest insider filing shown is dated Jun 17, 2026. The latest institutional report shown is dated Mar 31, 2026; other ownership filings may exist.
Ownership
Who holds the shares, as reported in SEC ownership filings.
Reported 13F positions
Each row shows what a filer reported for one date, not a current position. The link opens that filing.
| Filer | Report date | Shares | Value | Filing |
|---|---|---|---|---|
| Russell Investments Group, Ltd. | 2026-03-31 | 66,131 | $142K | SEC filing |
| DAFNA Capital Management LLC | 2026-03-31 | 908,351 | $1.95M | SEC filing |
| HighTower Advisors, LLC | 2026-03-31 | 10,760 | $23.1K | SEC filing |
| MAI Capital Management | 2026-03-31 | 67 | $145 | SEC filing |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 2026-03-31 | 787,408 | $1.69M | SEC filing |
| Utah Retirement Systems | 2026-03-31 | 154,290 | $332K | SEC filing |
| AMERIPRISE FINANCIAL INC | 2026-03-31 | 271,272 | $583K | SEC filing |
| Kynam Capital Management, LP | 2026-03-31 | 2,000,000 | $4.3M | SEC filing |
| Wilmington Savings Fund Society, FSB | 2026-03-31 | 400 | $860 | SEC filing |
| MEDICI CAPITAL LLC | 2026-03-31 | 1,652,520 | $3.55M | SEC filing |
| SIMPLEX TRADING, LLC | 2026-03-31 | 68,477 | $147K | SEC filing |
| Caitong International Asset Management Co., Ltd | 2026-03-31 | 2 | $4 | SEC filing |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P | 2026-03-31 | 200,000 | $430K | SEC filing |
| NEUBERGER BERMAN GROUP LLC | 2026-03-31 | 14,528 | $31.2K | SEC filing |
| Fortitude Family Office, LLC | 2026-03-31 | 255 | $548 | SEC filing |
| Lloyd Advisory Services, LLC. | 2026-03-31 | 48 | $103 | SEC filing |
| MARK SHEPTOFF FINANCIAL PLANNING, LLC | 2026-03-31 | 300 | $771 | SEC filing |
| ADAR1 Capital Management, LLC | 2026-03-31 | 1,050,000 | $2.26M | SEC filing |
| Mariner, LLC | 2026-03-31 | 18,799 | $40.4K | SEC filing |
| Blackstone Inc. | 2026-03-31 | 77,145 | $166K | SEC filing |
120 filers have only one report here.
Unusually large insider trades
Each trade is compared with the other insider trades of the same kind in the same security among Alector, Inc.'s recent filings on file. Size alone is context, not a prediction or evidence of improper trading.
- 2026-06-02 · Rosenthal Arnon: Larger than 87 of the 90 other insider sales of Common Stock on file. SEC filing
- 2026-03-02 · Rosenthal Arnon: Larger than 86 of the 90 other insider sales of Common Stock on file. SEC filing
- 2025-12-03 · Rosenthal Arnon: Larger than 88 of the 90 other insider sales of Common Stock on file. SEC filing
- 2023-09-11 · MCGUIRE TERRANCE: Larger than 89 of the 90 other insider sales of Common Stock on file. SEC filing
- 2023-09-11 · Polaris Venture Partners VI, L.P.: Larger than 89 of the 90 other insider sales of Common Stock on file. SEC filing
- 2021-12-13 · SULIMAN SHEHNAAZ: Larger than 83 of the 90 other insider sales of Common Stock on file. SEC filing
- 2021-12-10 · SULIMAN SHEHNAAZ: Larger than 84 of the 90 other insider sales of Common Stock on file. SEC filing
- 2021-12-09 · SULIMAN SHEHNAAZ: Larger than 85 of the 90 other insider sales of Common Stock on file. SEC filing
Purchases & sales (open market or private)
| Security | Code | Price | Filing | |||
|---|---|---|---|---|---|---|
| 2026-06-03 | Wong-Sarad Grace · Principal Accounting Officer | Common Stock | S — Open market or private sale | −3,475 | 1.88 | SEC filing |
| 2026-06-02 | Wong-Sarad Grace · Principal Accounting Officer | Common Stock | S — Open market or private sale | −5,709 | 1.97 | SEC filing |
| 2026-06-02 | Rosenthal Arnon · Chief Executive Officer | Common Stock | S — Open market or private sale | −87,216 | 1.97 | SEC filing |
| 2026-06-02 | Berkley Neil Lindsay · CFO & Chief Business Officer | Common Stock | S — Open market or private sale | −19,360 | 1.97 | SEC filing |
| 2026-04-16 | Wong-Sarad Grace · Principal Accounting Officer | Common Stock | S — Open market or private sale | −1,820 | 2.65 | SEC filing |
| 2026-03-10 | Wong-Sarad Grace · Principal Accounting Officer | Common Stock | S — Open market or private sale | −1,000 | 2.65 | SEC filing |
| 2026-03-03 | Wong-Sarad Grace · Principal Accounting Officer | Common Stock | S — Open market or private sale | −3,367 | 2.08 | SEC filing |
| 2026-03-02 | Berkley Neil Lindsay · CFO & Chief Business Officer | Common Stock | S — Open market or private sale | −29,649 | 2.12 | SEC filing |
Showing 8 of 10 rows
Grants, exercises, tax & gifts
| Security | Code | Filing | |||
|---|---|---|---|---|---|
| 2026-06-17 | Yaffe Kristine · Director | Stock Option (right to buy) | A — Grant, award, or other acquisition | +9,450 | SEC filing |
| 2026-06-17 | Altmeyer Mark · Director | Common Stock | A — Grant, award, or other acquisition | +28,700 | SEC filing |
| 2026-06-17 | DESOUZA ERROL B · Director | Common Stock | A — Grant, award, or other acquisition | +28,700 | SEC filing |
| 2026-06-17 | DESOUZA ERROL B · Director | Stock Option (right to buy) | A — Grant, award, or other acquisition | +9,450 | SEC filing |
| 2026-06-17 | GAROFALO ELIZABETH A. · Director | Stock Option (right to buy) | A — Grant, award, or other acquisition | +9,450 | SEC filing |
| 2026-06-17 | Hammond Paula · Director | Stock Option (right to buy) | A — Grant, award, or other acquisition | +9,450 | SEC filing |
| 2026-06-17 | GAROFALO ELIZABETH A. · Director | Common Stock | A — Grant, award, or other acquisition | +28,700 | SEC filing |
| 2026-06-17 | Yaffe Kristine · Director | Common Stock | A — Grant, award, or other acquisition | +28,700 | SEC filing |
Showing 8 of 21 rows
Other activity
| Security | Code | Filing | |||
|---|---|---|---|---|---|
| 2024-05-29 | Polaris Venture Partners VI, L.P. · 10% owner | Common Stock | J — Other acquisition or disposition | +98,533 | SEC filing |
| 2024-05-29 | Polaris Venture Partners VI, L.P. · 10% owner | Common Stock | J — Other acquisition or disposition | −500,000 | SEC filing |
| 2024-05-29 | Polaris Venture Partners VI, L.P. · 10% owner | Common Stock | J — Other acquisition or disposition | −98,533 | SEC filing |
| 2024-04-30 | Polaris Venture Partners VI, L.P. · 10% owner | Common Stock | J — Other acquisition or disposition | +98,533 | SEC filing |
| 2024-04-30 | Polaris Venture Partners VI, L.P. · 10% owner | Common Stock | J — Other acquisition or disposition | −500,000 | SEC filing |
| 2024-04-30 | Polaris Venture Partners VI, L.P. · 10% owner | Common Stock | J — Other acquisition or disposition | −98,533 | SEC filing |
| 2023-08-22 | MCGUIRE TERRANCE · Director, 10% owner | Common Stock | J — Other acquisition or disposition | +98,533 | SEC filing |
| 2023-08-22 | MCGUIRE TERRANCE · Director, 10% owner | Common Stock | J — Other acquisition or disposition | +6,429 | SEC filing |
Showing 8 of 10 rows
These tables describe filed transactions, not current holdings. Prices are shown as filed; a currency is added only when the filing's data names one. Amended and possible duplicate rows are left out of size comparisons and transaction groups.