Alector, Inc. — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| Wong-Sarad Grace | Principal Accounting Officer | Sale | 4,753 | $1.21 | $5,751 | 122,982 | Dec 5, 2025 |
| Wong-Sarad Grace | Principal Accounting Officer | Sale | 8,056 | $1.12 | $9,023 | 127,735 | Dec 3, 2025 |
| Rosenthal Arnon | Chief Executive Officer | Sale | 104,347 | $1.12 | $116,869 | 2,420,040 | Dec 3, 2025 |
| Kenkare-Mitra Sara | President and Head of R&D | Sale | 41,687 | $1.12 | $46,689 | 501,652 | Dec 3, 2025 |
| Berkley Neil Lindsay | Chief Bus Ofcr & Interim CFO | Sale | 37,261 | $1.12 | $41,732 | 374,309 | Dec 3, 2025 |
| Wong-Sarad Grace | Principal Accounting Officer | Award / Grant | 32,343 | — | — | 135,791 | Nov 10, 2025 |
| Berkley Neil Lindsay | Chief Bus Ofcr & Interim CFO | Award / Grant | 65,000 | — | — | 411,570 | Nov 10, 2025 |
| Rosenthal Arnon | Chief Executive Officer | Award / Grant | 174,167 | — | — | 2,524,387 | Nov 10, 2025 |
| Wong-Sarad Grace | Principal Accounting Officer | Sale | 5,910 | $2.50 | $14,775 | 103,448 | Sep 2, 2025 |
| Berkley Neil Lindsay | Principal Financial Officer | Sale | 15,842 | $2.50 | $39,605 | 346,570 | Sep 2, 2025 |
| Kenkare-Mitra Sara | President and Head of R&D | Sale | 23,638 | $2.50 | $59,095 | 543,339 | Sep 2, 2025 |
| Rosenthal Arnon | Chief Executive Officer | Sale | 51,562 | $2.50 | $128,905 | 2,350,220 | Sep 2, 2025 |
| Hammond Paula | — | Sale | 14,000 | $2.36 | $33,040 | 74,909 | Aug 26, 2025 |
| Kenkare-Mitra Sara | President and Head of R&D | Award / Grant | 54,725 | — | — | 566,977 | Jul 1, 2025 |
| Rosenthal Arnon | Chief Executive Officer | Award / Grant | 137,125 | — | — | 2,551,782 | Jul 1, 2025 |
| Yaffe Kristine | — | Sale | 1,000 | $1.44 | $1,440 | 95,409 | Jun 20, 2025 |
| Hammond Paula | — | Award / Grant | 28,700 | — | — | 88,909 | Jun 11, 2025 |
| Yaffe Kristine | — | Award / Grant | 28,700 | — | — | 96,409 | Jun 11, 2025 |
| GAROFALO ELIZABETH A. | — | Award / Grant | 28,700 | — | — | 89,950 | Jun 11, 2025 |
| SCHELLER RICHARD H | — | Award / Grant | 28,700 | — | — | 95,366 | Jun 11, 2025 |
| LAVIGNE LOUIS J JR | — | Award / Grant | 28,700 | — | — | 99,409 | Jun 11, 2025 |
| DESOUZA ERROL B | — | Award / Grant | 28,700 | — | — | 69,950 | Jun 11, 2025 |
| Altmeyer Mark | — | Award / Grant | 28,700 | — | — | 69,950 | Jun 11, 2025 |
| GRASSO MARC | Chief Financial Officer | Sale | 16,488 | $1.34 | $22,094 | 296,072 | Jun 2, 2025 |
| Kenkare-Mitra Sara | President and Head of R&D | Sale | 23,890 | $1.34 | $32,013 | 512,252 | Jun 2, 2025 |
| Rosenthal Arnon | Chief Executive Officer | Sale | 52,087 | $1.34 | $69,797 | 2,414,657 | Jun 2, 2025 |
| SCHELLER RICHARD H | — | Award / Grant | 15,833 | — | — | 66,666 | May 2, 2025 |
| GRASSO MARC | Chief Financial Officer | Sale | 18,091 | $1.47 | $26,594 | 312,560 | Mar 3, 2025 |
| Kenkare-Mitra Sara | President and Head of R&D | Sale | 29,073 | $1.47 | $42,737 | 536,142 | Mar 3, 2025 |
| Rosenthal Arnon | Chief Executive Officer | Sale | 40,330 | $1.47 | $59,285 | 2,466,744 | Mar 3, 2025 |
| Romano Gary | Chief Medical Officer | Sale | 16,306 | $1.47 | $23,970 | 332,977 | Mar 3, 2025 |
| GRASSO MARC | Chief Financial Officer | Sale | 16,489 | $2.52 | $41,552 | 330,651 | Dec 2, 2024 |
| Rosenthal Arnon | Chief Executive Officer | Sale | 52,172 | $2.52 | $131,473 | 2,507,074 | Dec 2, 2024 |
| Kenkare-Mitra Sara | President and Head of R&D | Sale | 26,500 | $2.52 | $66,780 | 565,215 | Dec 2, 2024 |
| Romano Gary | Chief Medical Officer | Sale | 14,892 | $2.52 | $37,528 | 349,283 | Dec 2, 2024 |
| GRASSO MARC | Chief Financial Officer | Award / Grant | 216,400 | — | — | 347,140 | Oct 1, 2024 |
| Rosenthal Arnon | Chief Executive Officer | Award / Grant | 610,500 | — | — | 2,559,246 | Oct 1, 2024 |
| Kenkare-Mitra Sara | President and Head of R&D | Award / Grant | 300,000 | — | — | 591,715 | Oct 1, 2024 |
| Romano Gary | Chief Medical Officer | Award / Grant | 184,380 | — | — | 364,175 | Oct 1, 2024 |
| GRASSO MARC | Chief Financial Officer | Sale | 7,297 | $4.88 | $35,609 | 130,740 | Sep 3, 2024 |
| Rosenthal Arnon | Chief Executive Officer | Sale | 26,499 | $4.88 | $129,315 | 1,948,746 | Sep 3, 2024 |
| Kenkare-Mitra Sara | President and Head of R&D | Sale | 13,926 | $4.88 | $67,959 | 291,715 | Sep 3, 2024 |
| Romano Gary | Chief Medical Officer | Sale | 8,478 | $4.88 | $41,373 | 179,795 | Sep 3, 2024 |
| SCHELLER RICHARD H | — | Sale | 44,250 | $5.16 | $228,330 | 35,000 | Aug 22, 2024 |
| Hammond Paula | — | Sale | 10,500 | $5.06 | $53,130 | 60,209 | Aug 12, 2024 |
| Yaffe Kristine | — | Sale | 5,000 | $5.06 | $25,300 | 67,709 | Aug 12, 2024 |
| SCHELLER RICHARD H | — | Award / Grant | 15,833 | — | — | 50,833 | Aug 2, 2024 |
| LAVIGNE LOUIS J JR | — | Award / Grant | 35,000 | — | — | 70,709 | Jun 12, 2024 |
| Yaffe Kristine | — | Award / Grant | 35,000 | — | — | 72,709 | Jun 12, 2024 |
| GAROFALO ELIZABETH A. | — | Award / Grant | 35,000 | — | — | 61,250 | Jun 12, 2024 |