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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
Dec 6, 2023 (view filing)Dec 42 daysRosenthal ArnonChief Executive OfficerSSale−23.8K$5.56−$132.5K−1.2%2.02M after
Dec 6, 2023 (view filing)Dec 42 daysRomano GaryChief Medical OfficerSSale−5.04K$5.56−$28.0K−2.4%202.3K after
Dec 6, 2023 (view filing)Dec 42 daysGrasso MarcChief Financial OfficerSSale−4.57K$5.56−$25.4K−2.9%150.7K after
Dec 6, 2023 (view filing)Dec 42 daysKenkare-Mitra SaraPresident and Head of R&DSSale−12.5K$5.56−$69.6K−3.7%329.0K after
Sep 13, 2023 (view filing)4:33 PM ETSep 112 daysPolaris Venture Partners VI, L.P. and 4 others10% OwnerSSale−500.0K$6.00−$3.00M−4.4%10.9M afterDuplicate filing
Sep 13, 2023 (view filing)Sep 112 daysMcGuire TerranceDirector, 10% OwnerSSale−500.0K$6.00−$3.00M−4.4%10.9M after
Sep 6, 2023 (view filing)Sep 51 dayRosenthal ArnonChief Executive OfficerSSale−5.65K$5.19−$29.3K−0.3%1.65M after
Sep 6, 2023 (view filing)Sep 51 dayKenkare-Mitra SaraPresident and Head of R&DSSale−6.21K$5.19−$32.3K−3.4%177.9K after
Sep 6, 2023 (view filing)Sep 51 dayRomano GaryChief Medical OfficerSSale−2.77K$5.19−$14.4K−2.7%99.3K after
Sep 6, 2023 (view filing)Sep 51 dayGrasso MarcChief Financial OfficerSSale−1.11K$5.19−$5.78K−3.3%32.2K after
Jun 5, 2023 (view filing)Jun 23 daysKenkare-Mitra SaraPresident and Head of R&DSSale−4.09K$6.90−$28.2K−2.2%184.1K after
Jun 5, 2023 (view filing)Jun 23 daysGrasso MarcChief Financial OfficerSSale−1.05K$6.90−$7.25K−3.1%33.4K after
Jun 5, 2023 (view filing)Jun 23 daysRomano GaryChief Medical OfficerSSale−2.62K$6.90−$18.1K−2.5%102.1K after
Jun 5, 2023 (view filing)Jun 23 daysRosenthal ArnonChief Executive OfficerSSale−5.25K$6.90−$36.3K−0.3%1.65M after
Mar 21, 2023 (view filing)Mar 174 daysRosenthal ArnonChief Executive OfficerSSale−15.2K$6.22−$94.5K−0.9%1.66M after
Mar 3, 2023 (view filing)Dec 2, 2022-Mar 2, 202391 daysLateRomano GaryChief Medical OfficerSSale−5.38K$8.48−$45.6K−4.9%104.7K after2 lots
Mar 3, 2023 (view filing)Mar 21 dayKenkare-Mitra SaraPresident and Head of R&DSSale−10.1K$8.32−$84.2K−5.1%188.2K after
Mar 3, 2023 (view filing)Mar 21 dayGrasso MarcChief Financial OfficerSSale−1.29K$8.32−$10.7K−3.6%34.4K after
Mar 3, 2023 (view filing)Mar 21 dayRosenthal ArnonChief Executive OfficerSSale−5.85K$8.32−$48.7K−0.4%1.63M after
Sep 7, 2022 (view filing)Sep 25 daysRomano GaryChief Medical OfficerSSale−2.18K$10.62−$23.1K−2.4%90.1K after
Sep 7, 2022 (view filing)Sep 25 daysKing RobertChief Development OfficerSSale−176$10.62−$1.87K0.0%529.3K after
Jun 6, 2022 (view filing)Jun 24 daysKing RobertChief Development OfficerSSale−177$8.71−$1.54K0.0%529.5K after
Mar 3, 2022 (view filing)Mar 12 daysKing RobertChief Development OfficerSSale−287$15.57−$4.47K−0.1%528.4K after
Dec 14, 2021 (view filing)Dec 10-134 daysSuliman ShehnaazPresident and COOSSale−150.0K$21.50−$3.23M−59.4%102.6K after4 lots
Dec 10, 2021 (view filing)Dec 8-92 daysSuliman ShehnaazPresident and COOSSale−150.0K$22.81−$3.42M−59.4%102.6K after4 lots
Dec 3, 2021 (view filing)Dec 12 daysKing RobertChief Development OfficerSSale−250$20.09−$5.02K0.0%528.7K after
Nov 12, 2021 (view filing)Nov 10-112 daysRosenthal ArnonChief Executive OfficerSSale−110.0K$25.00−$2.75M−5.3%1.97M after2 lots
Nov 10, 2021 (view filing)Nov 8-92 daysRosenthal ArnonChief Executive OfficerSSale−200.0K$25.00−$5.00M−23.5%652.5K after8 lots
Nov 8, 2021 (view filing)Nov 4-54 daysRosenthal ArnonChief Executive OfficerSSale−200.0K$25.00−$5.00M−22.7%682.5K after8 lots
Sep 23, 2021 (view filing)Sep 22-231 dayRosenthal ArnonChief Executive OfficerSSale−109.6K$25.31−$2.77M−4.5%2.30M after3 lots
Sep 22, 2021 (view filing)Sep 20-212 daysRosenthal ArnonChief Executive OfficerSSale−200.0K$25.96−$5.19M−7.7%2.41M after4 lots
Aug 11, 2021 (view filing)Aug 92 daysPaul RobertChief Medical OfficerSSale−22.9K$27.18−$623.7K−8.9%234.3K after2 lots
Aug 9, 2021 (view filing)Jul 2-Aug 538 daysLateScheller Richard HDirectorSSale−66.2K$28.20−$1.87M−100.0%0 after3 lots
Jul 8, 2021 (view filing)Jul 6-72 daysPaul RobertChief Medical OfficerSSale−59.7K$38.00−$2.27M−20.3%234.3K after9 lots
Jul 7, 2021 (view filing)Jul 2-65 daysYu CalvinVice President, FinanceSSale−114.2K$32.80−$3.74M−59.8%76.7K after3 lots
Jul 7, 2021 (view filing)Jul 25 daysKing RobertChief Development OfficerSSale−60.0K$31.14−$1.87M−10.3%522.3K after
Jul 6, 2021 (view filing)Jul 1-25 daysPaul RobertChief Medical OfficerSSale−56.7K$26.94−$1.53M−19.5%234.3K after2 lots