Form4insider filings, from the source

Company · CIK 0001653087 · SIC 2836 — Biological Products, (No Diagnostic Substances) · Nasdaq

Alector, Inc. · ALEC

Insider activity reported against this company. All insider holders · On EDGAR ↗

1M3M6M1Y2YAll datashares as filed — not split-adjusted
Open-market buys & salesbuys $0 · 0sales $524k · 6net −$524k
$10k$10k$100k$100k$1M$1MbuyssalesMar 28Apr 27May 28Jun 28Jul 29Aug 29Sep 28

Reported at this company — common stock

TradeReported (ET)InsiderSharesAvg priceTotalOwned afterΔ stakeFlags
Sep 3, 2026 SForm 4 →Sep 4, 5:45 pm EDTNeil Lindsay BerkleyCFO & Chief Business Officer29,251$2.66$77,948350,649−7.70%
Sep 3, 2026 SForm 4 →Sep 4, 5:45 pm EDTArnon RosenthalChief Executive Officer, Director72,606$2.66$193,4732,294,600−3.07%
Sep 2, 2026 SForm 4 →Sep 4, 5:45 pm EDTGrace Wong-SaradPrincipal Accounting Officer9,446$2.61$24,666106,015−8.18%
Aug 19, 2026 GForm 4 →Aug 21, 6:00 pm EDTArnon RosenthalChief Executive Officer, Director2,100,000——1,002,500—
Jul 9, 2026 AForm 4 →Jul 9, 4:05 pm EDTGrace Wong-SaradPrincipal Accounting Officer20,000——115,461—
Jun 17, 2026 AForm 4 →Jun 17, 4:05 pm EDTKristine YaffeDirector28,700——124,109—
Jun 17, 2026 AForm 4 →Jun 17, 4:05 pm EDTRichard H SchellerDirector28,700——134,899—
Jun 17, 2026 AForm 4 →Jun 17, 4:05 pm EDTPaula HammondDirector28,700——103,609—
Jun 17, 2026 AForm 4 →Jun 17, 4:05 pm EDTElizabeth A. GarofaloDirector28,700——118,650—
Jun 17, 2026 AForm 4 →Jun 17, 4:05 pm EDTMark AltmeyerDirector28,700——98,650—
Jun 17, 2026 AForm 4 →Jun 17, 4:05 pm EDTErrol B DesouzaDirector28,700——98,650—
Jun 17, 2026 AForm 4 →Jun 17, 4:05 pm EDTLouis J Lavigne Jr.Director28,700——128,109—
Jun 2, 2026 SForm 4 →Jun 3, 5:30 pm EDTArnon RosenthalChief Executive Officer, Director87,216$1.97$172,1912,367,206−3.55%
Jun 2, 2026 SForm 4 →Jun 3, 5:30 pm EDTGrace Wong-SaradPrincipal Accounting Officer9,184$1.94$17,81395,461−8.78%
Jun 2, 2026 SForm 4 →Jun 3, 5:30 pm EDTNeil Lindsay BerkleyCFO & Chief Business Officer19,360$1.97$38,221379,900−4.85%
Jun 1, 2026 AForm 4 →Jun 3, 7:08 pm EDTRichard H SchellerDirector10,833——106,199—

Reported at this company — derivatives (options, RSUs, warrants)

TradeReported (ET)InsiderSharesAvg priceTotalOwned afterΔ stakeFlags
Jun 17, 2026 AForm 4 →Jun 17, 4:05 pm EDTKristine YaffeDirector9,450——9,450—
Jun 17, 2026 AForm 4 →Jun 17, 4:05 pm EDTRichard H SchellerDirector9,450——9,450—
Jun 17, 2026 AForm 4 →Jun 17, 4:05 pm EDTPaula HammondDirector9,450——9,450—
Jun 17, 2026 AForm 4 →Jun 17, 4:05 pm EDTElizabeth A. GarofaloDirector9,450——9,450—
Jun 17, 2026 AForm 4 →Jun 17, 4:05 pm EDTMark AltmeyerDirector9,450——9,450—
Jun 17, 2026 AForm 4 →Jun 17, 4:05 pm EDTErrol B DesouzaDirector9,450——9,450—
Jun 17, 2026 AForm 4 →Jun 17, 4:05 pm EDTLouis J Lavigne Jr.Director9,450——9,450—