13 insiders reported 57 Form 4 transactions for Alector, Inc. (ALEC) over the past 18 months (most recent 2026-08-21). Recent activity: Rosenthal Arnon (Chief Executive Officer) Sell 1.1M shares, Rosenthal Arnon (Chief Executive Officer) Buy 350,000 shares, Rosenthal Arnon (Chief Executive Officer) Buy 350,000 shares, Rosenthal Arnon (Chief Executive Officer) Buy 350,000 shares, Wong-Sarad Grace (Principal Accounting Officer) Buy 20,000 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-21 | Rosenthal Arnon | Chief Executive Officer | Sell | 1.1M | $0 |
| 2026-08-21 | Rosenthal Arnon | Chief Executive Officer | Buy | 350,000 | $0 |
| 2026-08-21 | Rosenthal Arnon | Chief Executive Officer | Buy | 350,000 | $0 |
| 2026-08-21 | Rosenthal Arnon | Chief Executive Officer | Buy | 350,000 | $0 |
| 2026-07-09 | Wong-Sarad Grace | Principal Accounting Officer | Buy | 20,000 | $0 |
| 2026-06-17 | GAROFALO ELIZABETH A. | Director | Buy | 28,700 | $0 |
| 2026-06-17 | DESOUZA ERROL B | Director | Buy | 28,700 | $0 |
| 2026-06-17 | LAVIGNE LOUIS J JR | Director | Buy | 28,700 | $0 |
| 2026-06-17 | SCHELLER RICHARD H | Director | Buy | 28,700 | $0 |
| 2026-06-17 | Altmeyer Mark | Director | Buy | 28,700 | $0 |
| 2026-06-17 | Yaffe Kristine | Director | Buy | 28,700 | $0 |
| 2026-06-17 | Hammond Paula | Director | Buy | 28,700 | $0 |
| 2026-06-03 | SCHELLER RICHARD H | Director | Buy | 10,833 | $0 |
| 2026-06-03 | Rosenthal Arnon | Chief Executive Officer | Sell | 87,216 | $172,191 |
| 2026-06-03 | Berkley Neil Lindsay | CFO & Chief Business Officer | Sell | 19,360 | $38,221 |
| 2026-06-03 | Wong-Sarad Grace | Principal Accounting Officer | Sell | 5,709 | $11,271 |
| 2026-06-03 | Wong-Sarad Grace | Principal Accounting Officer | Sell | 3,475 | $6,543 |
| 2026-04-17 | Wong-Sarad Grace | Principal Accounting Officer | Sell | 1,820 | $4,823 |
| 2026-03-13 | Rosenthal Arnon | Chief Executive Officer | Buy | 116,246 | $0 |
| 2026-03-13 | Berkley Neil Lindsay | CFO & Chief Business Officer | Buy | 54,600 | $0 |
| 2026-03-12 | Wong-Sarad Grace | Principal Accounting Officer | Sell | 1,000 | $2,650 |
| 2026-03-03 | Wong-Sarad Grace | Principal Accounting Officer | Sell | 8,071 | $17,111 |
| 2026-03-03 | Berkley Neil Lindsay | CFO & Chief Business Officer | Sell | 29,649 | $62,856 |
| 2026-03-03 | Rosenthal Arnon | Chief Executive Officer | Sell | 81,864 | $173,552 |
| 2026-03-03 | Wong-Sarad Grace | Principal Accounting Officer | Sell | 3,367 | $7,003 |
Source: SEC Form 4 filings · as of 2026-08-21