ALEC · Insider Trading
Alector, Inc. Common Stock
Every open-market purchase and sale reported by ALEC officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-10-15 | Neil Lindsay Berkley | CFO & Chief Business Officer | A | +44,567 | — |
| 2026-10-15 | Arnon Rosenthal | Chief Executive Officer | A | +217,500 | — |
| 2026-10-15 | Grace Wong-Sarad | Principal Accounting Officer | A | +55,555 | — |
| 2026-09-04 | Grace Wong-Sarad | Principal Accounting Officer | Sell | −9,446 | −$24.67K |
| 2026-09-04 | Neil Lindsay Berkley | CFO & Chief Business Officer | Sell | −29,251 | −$77.95K |
| 2026-09-04 | Arnon Rosenthal | Chief Executive Officer | Sell | −72,606 | −$193.47K |
| 2026-08-21 | Arnon Rosenthal | Chief Executive Officer | G | — | — |
| 2026-07-09 | Grace Wong-Sarad | Principal Accounting Officer | A | +20,000 | — |
| 2026-06-17 | Errol B Desouza | Director | A | +28,700 | — |
| 2026-06-17 | Paula Hammond | Director | A | +28,700 | — |
| 2026-06-17 | Mark Altmeyer | Director | A | +28,700 | — |
| 2026-06-17 | Elizabeth A. Garofalo | Director | A | +28,700 | — |
| 2026-06-17 | Kristine Yaffe | Director | A | +28,700 | — |
| 2026-06-17 | Richard H Scheller | Director | A | +28,700 | — |
| 2026-06-17 | Louis J Lavigne Jr | Director | A | +28,700 | — |
| 2026-06-03 | Grace Wong-Sarad | Principal Accounting Officer | Sell | −9,184 | −$17.81K |
| 2026-06-03 | Neil Lindsay Berkley | CFO & Chief Business Officer | Sell | −19,360 | −$38.22K |
| 2026-06-03 | Richard H Scheller | Director | A | +10,833 | — |
| 2026-06-03 | Arnon Rosenthal | Chief Executive Officer | Sell | −87,216 | −$172.19K |
| 2026-04-17 | Grace Wong-Sarad | Principal Accounting Officer | Sell | −1,820 | −$4.82K |
| 2026-03-13 | Neil Lindsay Berkley | CFO & Chief Business Officer | A | +54,600 | — |
| 2026-03-13 | Arnon Rosenthal | Chief Executive Officer | A | +116,246 | — |
| 2026-03-12 | Grace Wong-Sarad | Principal Accounting Officer | Sell | −1,000 | −$2.65K |
| 2026-03-03 | Grace Wong-Sarad | Principal Accounting Officer | Sell | −3,367 | −$7.01K |
| 2026-03-03 | Grace Wong-Sarad | Principal Accounting Officer | Sell | −8,071 | −$17.14K |
| 2026-03-03 | Arnon Rosenthal | Chief Executive Officer | Sell | −81,864 | −$173.82K |
| 2026-03-03 | Neil Lindsay Berkley | CFO & Chief Business Officer | Sell | −29,649 | −$62.95K |
| 2026-02-26 | Grace Wong-Sarad | Principal Accounting Officer | Sell | −4,079 | −$10.20K |
| 2025-12-08 | Grace Wong-Sarad | Principal Accounting Officer | Sell | −4,753 | −$5.75K |
| 2025-12-03 | Neil Lindsay Berkley | Chief Bus Ofcr & Interim CFO | Sell | −37,261 | −$41.72K |
| 2025-12-03 | Grace Wong-Sarad | Principal Accounting Officer | Sell | −8,056 | −$9.02K |
| 2025-12-03 | Sara Kenkare-Mitra | President and Head of R&D | Sell | −41,687 | −$46.67K |
| 2025-12-03 | Arnon Rosenthal | Chief Executive Officer | Sell | −104,347 | −$116.83K |
| 2025-11-12 | Neil Lindsay Berkley | Chief Bus Ofcr & Interim CFO | A | +65,000 | — |
| 2025-11-12 | Grace Wong-Sarad | Principal Accounting Officer | A | +32,343 | — |
| 2025-11-12 | Arnon Rosenthal | Chief Executive Officer | A | +174,167 | — |
| 2025-09-04 | Grace Wong-Sarad | Principal Accounting Officer | Sell | −5,910 | −$14.76K |
| 2025-09-04 | Arnon Rosenthal | Chief Executive Officer | Sell | −51,562 | −$128.74K |
| 2025-09-04 | Sara Kenkare-Mitra | President and Head of R&D | Sell | −23,638 | −$59.02K |
| 2025-09-04 | Neil Lindsay Berkley | Principal Financial Officer | Sell | −15,842 | −$39.55K |
| 2025-08-27 | Paula Hammond | Director | Sell | −14,000 | −$33.00K |
| 2025-07-01 | Sara Kenkare-Mitra | President and Head of R&D | A | +54,725 | — |
| 2025-07-01 | Neil Lindsay Berkley | Principal Financial Officer | A | +18,000 deriv. | — |
| 2025-07-01 | Arnon Rosenthal | Chief Executive Officer | A | +137,125 | — |
| 2025-06-23 | Kristine Yaffe | Director | Sell | −1,000 | −$1.44K |
| 2025-06-12 | Paula Hammond | Director | A | +28,700 | — |
| 2025-06-12 | Richard H Scheller | Director | A | +28,700 | — |
| 2025-06-12 | Errol B Desouza | Director | A | +28,700 | — |
| 2025-06-12 | Kristine Yaffe | Director | A | +28,700 | — |
| 2025-06-12 | Mark Altmeyer | Director | A | +28,700 | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Arnon Rosenthal | Chief Executive Officer | 3,514,600 | $6.43M |
| Sara Kenkare-Mitra | President and Head of R&D | 501,652 | $918.02K |
| Neil Lindsay Berkley | CFO & Chief Business Officer | 395,216 | $723.25K |
| Gary Romano | Chief Medical Officer | 332,977 | $609.35K |
| Marc Grasso | Chief Financial Officer | 296,072 | $541.81K |
| Grace Wong-Sarad | Principal Accounting Officer | 161,570 | $295.67K |
| Louis J Lavigne Jr | Director | 138,661 | $253.75K |
| Richard H Scheller | Director | 134,899 | $246.87K |
| Kristine Yaffe | Director | 124,109 | $227.12K |
| Elizabeth A. Garofalo | Director | 118,650 | $217.13K |
| Paula Hammond | Director | 103,609 | $189.60K |
| Errol B Desouza | Director | 98,650 | $180.53K |
| Mark Altmeyer | Director | 98,650 | $180.53K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the ALEC quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.