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Alector, Inc.

ALEC
Exchange
Nasdaq
Industry
Biological Products, (No Diagnostic Substances)
SEC CIK
0001653087

In the last 90 days, Alector, Inc. insiders filed 0 open-market purchases and 3 sales; 140 institutions reported holding it in 13F filings for Q2 2026, worth $183.4M in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Alector, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
3 filings
3 insiders, $296.1K in total
Insiders trading
3
Net value
−$296.1K
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Alector, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Alector, Inc.
NameTitleLast reported holdingLast filingFilings, past year
Wong-Sarad GracePrincipal Accounting Officer106,015Sep 4, 202611
Berkley Neil LindsayCFO & Chief Business Officer350,649Sep 4, 20266
Rosenthal ArnonChief Executive Officer2,294,600Sep 4, 20267
Desouza Errol BDirector98,650Jun 17, 20261
Lavigne Louis J JrDirector128,109Jun 17, 20261
Scheller Richard HDirector134,899Jun 17, 20262
Altmeyer MarkDirector98,650Jun 17, 20261
Yaffe KristineDirector124,109Jun 17, 20261
Hammond PaulaDirector103,609Jun 17, 20261
Garofalo Elizabeth A.Director118,650Jun 17, 20261
Kenkare-Mitra SaraPresident and Head of R&D501,652Dec 3, 20251
Grasso MarcChief Financial Officer296,072Jun 4, 20250
Romano GaryChief Medical Officer332,977Mar 5, 20250
Wehner David M.Director115,330Jun 12, 20240
Polaris Venture Partners VI, L.P.10% Owner0May 31, 20240
Polaris Venture Partners Founders' Fund VI, L.P.10% Owner0May 31, 20240
Polaris Venture Management Co. VI, L.L.C.10% Owner0May 31, 20240
Polaris Venture Partners VI (AIV), L.P.10% Owner0May 31, 20240
Polaris Venture Partners VI (AIV-B), L.P.10% Owner0May 31, 20240
McGuire TerranceDirector, 10% Owner10,853,817IndirectSep 13, 20230
Gerngross Tillman U.Director2,644,319Jun 15, 20230
King RobertChief Development Officer550,871Oct 4, 20220
Suliman ShehnaazPresident and COO102,598Dec 14, 20210
Paul RobertChief Medical Officer234,319Aug 11, 20210
Yu CalvinVice President, Finance76,686Jul 7, 20210

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Sep 4, 2026 (view filing)5:45 PM ETSep 2-42 daysWong-Sarad GracePrincipal Accounting OfficerSSale−9.45K$2.61−$24.7K−8.2%106.0K after3 lots
Sep 4, 2026 (view filing)5:45 PM ETSep 31 dayBerkley Neil LindsayCFO & Chief Business OfficerSSale−29.3K$2.66−$77.9K−7.7%350.6K after
Sep 4, 2026 (view filing)5:45 PM ETSep 31 dayRosenthal ArnonChief Executive OfficerSSale−72.6K$2.66−$193.5K−3.1%2.29M after
Jun 3, 2026 (view filing)Jun 21 dayRosenthal ArnonChief Executive OfficerSSale−87.2K$1.97−$171.8K−3.6%2.37M after
Jun 3, 2026 (view filing)Jun 2-31 dayWong-Sarad GracePrincipal Accounting OfficerSSale−9.18K$1.94−$17.8K−8.8%95.5K after2 lots
Jun 3, 2026 (view filing)Jun 21 dayBerkley Neil LindsayCFO & Chief Business OfficerSSale−19.4K$1.97−$38.1K−4.8%379.9K after
Apr 17, 2026 (view filing)Apr 161 dayWong-Sarad GracePrincipal Accounting OfficerSSale−1.82K$2.65−$4.82K−1.7%104.6K after10b5-1
Mar 12, 2026 (view filing)Mar 102 daysWong-Sarad GracePrincipal Accounting OfficerSSale−1.00K$2.65−$2.65K−0.9%106.5K after10b5-1
Mar 3, 2026 (view filing)Mar 21 dayBerkley Neil LindsayCFO & Chief Business OfficerSSale−29.6K$2.12−$62.9K−7.9%344.7K after
Mar 3, 2026 (view filing)Mar 3Same dayWong-Sarad GracePrincipal Accounting OfficerSSale−3.37K$2.08−$7.00K−3.0%107.5K after10b5-1
Mar 3, 2026 (view filing)Mar 21 dayWong-Sarad GracePrincipal Accounting OfficerSSale−8.07K$2.12−$17.1K−6.8%110.8K after
Mar 3, 2026 (view filing)Mar 21 dayRosenthal ArnonChief Executive OfficerSSale−81.9K$2.12−$173.6K−3.4%2.34M after
Feb 26, 2026 (view filing)Feb 26Same dayWong-Sarad GracePrincipal Accounting OfficerSSale−4.08K$2.50−$10.2K−3.3%118.9K after10b5-1
Dec 8, 2025 (view filing)Dec 53 daysWong-Sarad GracePrincipal Accounting OfficerSSale−4.75K$1.21−$5.75K−3.7%123.0K after
Dec 3, 2025 (view filing)Dec 3Same dayBerkley Neil LindsayChief Bus Ofcr & Interim CFOSSale−37.3K$1.12−$41.7K−9.1%374.3K after
Dec 3, 2025 (view filing)Dec 3Same dayWong-Sarad GracePrincipal Accounting OfficerSSale−8.06K$1.12−$9.02K−5.9%127.7K after
Dec 3, 2025 (view filing)Dec 3Same dayKenkare-Mitra SaraPresident and Head of R&DSSale−41.7K$1.12−$46.7K−7.7%501.7K after
Dec 3, 2025 (view filing)Dec 3Same dayRosenthal ArnonChief Executive OfficerSSale−104.3K$1.12−$116.9K−4.1%2.42M after
Sep 4, 2025 (view filing)Sep 22 daysWong-Sarad GracePrincipal Accounting OfficerSSale−5.91K$2.50−$14.8K−5.4%103.4K after
Sep 4, 2025 (view filing)Sep 22 daysBerkley Neil LindsayPrincipal Financial OfficerSSale−15.8K$2.50−$39.6K−4.4%346.6K after
Sep 4, 2025 (view filing)Sep 22 daysKenkare-Mitra SaraPresident and Head of R&DSSale−23.6K$2.50−$59.1K−4.2%543.3K after
Sep 4, 2025 (view filing)Sep 22 daysRosenthal ArnonChief Executive OfficerSSale−51.6K$2.50−$128.9K−2.1%2.35M after
Aug 27, 2025 (view filing)Aug 261 dayHammond PaulaDirectorSSale−14.0K$2.36−$33.0K−15.7%74.9K after10b5-1
Jun 23, 2025 (view filing)Jun 203 daysYaffe KristineDirectorSSale−1.00K$1.44−$1.44K−1.0%95.4K after10b5-1
Jun 4, 2025 (view filing)Jun 22 daysGrasso MarcChief Financial OfficerSSale−16.5K$1.34−$22.1K−5.3%296.1K after
Jun 4, 2025 (view filing)Jun 22 daysKenkare-Mitra SaraPresident and Head of R&DSSale−23.9K$1.34−$32.0K−4.5%512.3K after
Jun 4, 2025 (view filing)Jun 22 daysRosenthal ArnonChief Executive OfficerSSale−52.1K$1.34−$69.8K−2.1%2.41M after
Mar 5, 2025 (view filing)Mar 32 daysGrasso MarcChief Financial OfficerSSale−18.1K$1.47−$26.6K−5.5%312.6K after
Mar 5, 2025 (view filing)Mar 32 daysKenkare-Mitra SaraPresident and Head of R&DSSale−29.1K$1.47−$42.7K−5.1%536.1K after
Mar 5, 2025 (view filing)Mar 32 daysRosenthal ArnonChief Executive OfficerSSale−40.3K$1.47−$59.3K−1.6%2.47M after
Mar 5, 2025 (view filing)Mar 32 daysRomano GaryChief Medical OfficerSSale−16.3K$1.47−$24.0K−4.7%333.0K after
Dec 3, 2024 (view filing)Dec 21 dayGrasso MarcChief Financial OfficerSSale−16.5K$2.52−$41.6K−4.7%330.7K after
Dec 3, 2024 (view filing)Dec 21 dayRosenthal ArnonChief Executive OfficerSSale−52.2K$2.52−$131.5K−2.0%2.51M after
Dec 3, 2024 (view filing)Dec 21 dayKenkare-Mitra SaraPresident and Head of R&DSSale−26.5K$2.52−$66.8K−4.5%565.2K after
Dec 3, 2024 (view filing)Dec 21 dayRomano GaryChief Medical OfficerSSale−14.9K$2.52−$37.5K−4.1%349.3K after
Sep 4, 2024 (view filing)Sep 31 dayGrasso MarcChief Financial OfficerSSale−7.30K$4.88−$35.6K−5.3%130.7K after
Sep 4, 2024 (view filing)Sep 31 dayRosenthal ArnonChief Executive OfficerSSale−26.5K$4.88−$129.3K−1.3%1.95M after
Sep 4, 2024 (view filing)Sep 31 dayKenkare-Mitra SaraPresident and Head of R&DSSale−13.9K$4.88−$68.0K−4.6%291.7K after
Sep 4, 2024 (view filing)Sep 31 dayRomano GaryChief Medical OfficerSSale−8.48K$4.88−$41.4K−4.5%179.8K after
Aug 23, 2024 (view filing)Aug 221 dayScheller Richard HDirectorSSale−44.3K$5.16−$228.3K−55.8%35.0K after
Aug 13, 2024 (view filing)Aug 121 dayHammond PaulaDirectorSSale−10.5K$5.06−$53.1K−14.8%60.2K after10b5-1
Aug 13, 2024 (view filing)Aug 121 dayYaffe KristineDirectorSSale−5.00K$5.06−$25.3K−6.9%67.7K after10b5-1
Jun 4, 2024 (view filing)Jun 31 dayRosenthal ArnonChief Executive OfficerSSale−25.1K$4.80−$120.6K−1.3%1.98M after
Jun 4, 2024 (view filing)Jun 31 dayRomano GaryChief Medical OfficerSSale−8.04K$4.80−$38.6K−4.1%188.3K after
Jun 4, 2024 (view filing)Jun 31 dayKenkare-Mitra SaraPresident and Head of R&DSSale−13.2K$4.80−$63.4K−4.1%305.6K after
Jun 4, 2024 (view filing)Jun 31 dayGrasso MarcChief Financial OfficerSSale−6.92K$4.80−$33.2K−4.8%138.0K after
Mar 5, 2024 (view filing)Mar 41 dayRomano GaryChief Medical OfficerSSale−6.00K$6.92−$41.5K−3.0%196.3K after
Mar 5, 2024 (view filing)Mar 41 dayKenkare-Mitra SaraPresident and Head of R&DSSale−10.2K$6.92−$70.4K−3.1%318.8K after
Mar 5, 2024 (view filing)Mar 41 dayGrasso MarcChief Financial OfficerSSale−5.72K$6.92−$39.6K−3.8%145.0K after
Mar 5, 2024 (view filing)Mar 41 dayRosenthal ArnonChief Executive OfficerSSale−18.8K$6.92−$130.4K−0.9%2.00M after