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 $296k · 3net −$296k
$10k$10k$100k$100k$1M$1MbuyssalesAug 28Sep 2Sep 7Sep 12Sep 18Sep 23Sep 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%

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

No reported derivative activity in this period.