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Alector, Inc.

ALEC
Healthcare|Biotechnology|US
$2.29
+0.20 (+9.57%)
Tangible Book / Share
$1.05
Graham Number
$2.96
Cash / Share
$1.25

Ownership Breakdown

68.6%
Float
148.3M
Shares Outstanding
101.7M
Float Shares

Major Holders (38)

Combined: 179.3%

Holders of 5%+ from their latest Schedule 13D/13G filing in the last two years. Percentages are as of each filing date.

HolderType% of ClassSharesFiledFiling
Chen YuIndividual9.20%10,000,000Nov 14, 202513D/G
David KroinHC, IN8.61%12,772,152Oct 23, 202613D/G
Deep Track Capital, LPIA, OO8.61%12,772,152Oct 23, 202613D/G
Deep Track Biotechnology Master Fund, Ltd.Corporation8.61%12,772,152Oct 23, 202613D/G
BVF Partners L P/IlIA, PN8.40%9,374,267Sep 18, 202613D/G
BVF Inc/IlCorporation8.40%9,374,267Sep 18, 202613D/G
Lampert Mark NIndividual8.40%9,374,267Sep 18, 202613D/G
BVF GP Holdings LLCOther7.70%8,571,159Sep 18, 202613D/G
Arnon RosenthalIndividual7.40%8,213,925Feb 6, 202613D/G
BlackRock, Inc.Holding company5.20%5,784,214Apr 27, 202613D/G
RA Capital Management, L.P.IA, PN5.10%7,500,000Oct 26, 202613D/G
RA Capital Healthcare Fund, L.P.Partnership5.10%7,500,000Oct 26, 202613D/G
Peter KolchinskyHC, IN5.10%7,500,000Oct 26, 202613D/G
Rajeev ShahHC, IN5.10%7,500,000Oct 26, 202613D/G
Terrance G. McGuireIndividual4.70%5,173,499May 14, 202613D/G
TCG Crossover Fund III, L.P.Partnership4.60%5,000,000Nov 14, 202513D/G
TCG Crossover Fund II, L.P.Partnership4.60%5,000,000Nov 14, 202513D/G
TCG Crossover GP II, LLCOther4.60%5,000,000Nov 14, 202513D/G
TCG Crossover GP III, LLCOther4.60%5,000,000Nov 14, 202513D/G
Amir NashatIndividual4.50%4,985,149May 14, 202613D/G
Biotechnology Value Fund L PPartnership4.40%4,900,143Sep 18, 202613D/G
BVF I GP LLCOther4.40%4,900,143Sep 18, 202613D/G
Polaris Venture Management Co VI, L.L.C.Other4.40%4,853,817May 14, 202613D/G
David BarrettIndividual4.40%4,853,817May 14, 202613D/G
Brian CheeIndividual4.40%4,853,817May 14, 202613D/G
Jonathan A. FlintIndividual4.40%4,892,941May 14, 202613D/G
Bryce YoungrenIndividual4.40%4,865,681May 14, 202613D/G
Abigail P. JohnsonIndividual3.60%3,599,820Nov 7, 202513D/G
FMR LLCHolding company3.60%3,599,820Nov 7, 202513D/G
BVF II GP LLCOther3.30%3,671,016Sep 18, 202613D/G
Biotechnology Value Fund II LPPartnership3.30%3,671,016Sep 18, 202613D/G
Polaris Venture Partners VI (AIV), L.P.Partnership3.00%3,280,842May 14, 202613D/G
Polaris Venture Partners VI (AIV-B), L.P.Partnership0.70%806,528May 14, 202613D/G
BVF Partners OS Ltd.Corporation0.60%619,317Sep 18, 202613D/G
Biotechnology Value Trading Fund OS LPPartnership0.60%619,317Sep 18, 202613D/G
Polaris Venture Partners Founders’ Fund VI, L.P.Partnership0.60%544,039Nov 12, 202413D/G
Polaris Venture Partners VI, L.P.Partnership0.50%498,468May 14, 202613D/G
Polaris Venture Partners Founders' Fund VI, L.P.Partnership0.20%267,979May 14, 202613D/G

Insider Trades (100)

Last 4 quarters: 4,842,518 acquired · 3,799,735 disposed
InsiderPositionDateTypeSharesPriceValueFiling
Rosenthal Arnondirector, officer: Chief Executive OfficerOct 14, 2026AWARD217,500——Form 4
Rosenthal Arnondirector, officer: Chief Executive OfficerOct 14, 2026AWARD978,750$1.88$1.8MForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerOct 13, 2026AWARD520,000$1.87$972.4KForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerOct 13, 2026AWARD500,000$1.87$935.0KForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerOct 13, 2026AWARD457,038$1.87$854.7KForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerOct 13, 2026AWARD417,213$1.87$780.2KForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerOct 13, 2026AWARD275,000$1.87$514.3KForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerOct 13, 2026AWARD132,500$1.87$247.8KForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerOct 13, 2026AWARD119,446$1.87$223.4KForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerOct 13, 2026DISPOSED500,000$8.16$4.1MForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerOct 13, 2026DISPOSED275,000$10.14$2.8MForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerOct 13, 2026DISPOSED520,000$17.15$8.9MForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerOct 13, 2026DISPOSED457,038$10.24$4.7MForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerOct 13, 2026DISPOSED417,213$23.70$9.9MForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerOct 13, 2026DISPOSED119,446$9.46$1.1MForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerOct 13, 2026DISPOSED132,500$6.48$858.6KForm 4
Wong-Sarad GracePrincipal Accounting OfficerOct 14, 2026AWARD55,555——Form 4
Wong-Sarad GracePrincipal Accounting OfficerOct 14, 2026AWARD83,435$1.88$156.9KForm 4
Wong-Sarad GracePrincipal Accounting OfficerOct 13, 2026AWARD20,454$1.87$38.2KForm 4
Wong-Sarad GracePrincipal Accounting OfficerOct 13, 2026AWARD20,000$1.87$37.4KForm 4
Wong-Sarad GracePrincipal Accounting OfficerOct 13, 2026AWARD13,842$1.87$25.9KForm 4
Wong-Sarad GracePrincipal Accounting OfficerOct 13, 2026AWARD11,552$1.87$21.6KForm 4
Wong-Sarad GracePrincipal Accounting OfficerOct 13, 2026AWARD11,309$1.87$21.1KForm 4
Wong-Sarad GracePrincipal Accounting OfficerOct 13, 2026AWARD10,228$1.87$19.1KForm 4
Wong-Sarad GracePrincipal Accounting OfficerOct 13, 2026DISPOSED20,000$16.46$329.2KForm 4
Wong-Sarad GracePrincipal Accounting OfficerOct 13, 2026DISPOSED13,842$17.15$237.4KForm 4
Wong-Sarad GracePrincipal Accounting OfficerOct 13, 2026DISPOSED20,454$10.24$209.4KForm 4
Wong-Sarad GracePrincipal Accounting OfficerOct 13, 2026DISPOSED10,228$13.56$138.7KForm 4
Wong-Sarad GracePrincipal Accounting OfficerOct 13, 2026DISPOSED11,552$23.70$273.8KForm 4
Wong-Sarad GracePrincipal Accounting OfficerOct 13, 2026DISPOSED11,309$9.46$107.0KForm 4
Berkley Neil LindsayCFO & Chief Business OfficerOct 14, 2026AWARD44,567——Form 4
Berkley Neil LindsayCFO & Chief Business OfficerOct 14, 2026AWARD190,000$1.88$357.2KForm 4
Wong-Sarad GracePrincipal Accounting OfficerSep 2, 2026SELL656$2.75$1.8KForm 4
Wong-Sarad GracePrincipal Accounting OfficerSep 3, 2026SELL5,165$2.67$13.8KForm 4
Wong-Sarad GracePrincipal Accounting OfficerSep 4, 2026SELL3,625$2.51$9.1KForm 4
Berkley Neil LindsayCFO & Chief Business OfficerSep 3, 2026SELL29,251$2.66$77.9KForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerSep 3, 2026SELL72,606$2.66$193.5KForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerAug 19, 2026GIFT350,000——Form 4
Rosenthal Arnondirector, officer: Chief Executive OfficerAug 19, 2026GIFT1,050,000——Form 4
Wong-Sarad GracePrincipal Accounting OfficerJul 9, 2026AWARD20,000——Form 4
Yaffe KristinedirectorJun 17, 2026AWARD28,700——Form 4
Yaffe KristinedirectorJun 17, 2026AWARD9,450——Form 4
SCHELLER RICHARD HdirectorJun 17, 2026AWARD28,700——Form 4
SCHELLER RICHARD HdirectorJun 17, 2026AWARD9,450——Form 4
Hammond PauladirectorJun 17, 2026AWARD28,700——Form 4
Hammond PauladirectorJun 17, 2026AWARD9,450——Form 4
GAROFALO ELIZABETH A.directorJun 17, 2026AWARD28,700——Form 4
GAROFALO ELIZABETH A.directorJun 17, 2026AWARD9,450——Form 4
Altmeyer MarkdirectorJun 17, 2026AWARD28,700——Form 4
Altmeyer MarkdirectorJun 17, 2026AWARD9,450——Form 4
DESOUZA ERROL BdirectorJun 17, 2026AWARD28,700——Form 4
DESOUZA ERROL BdirectorJun 17, 2026AWARD9,450——Form 4
LAVIGNE LOUIS J JRdirectorJun 17, 2026AWARD28,700——Form 4
LAVIGNE LOUIS J JRdirectorJun 17, 2026AWARD9,450——Form 4
SCHELLER RICHARD HdirectorJun 1, 2026AWARD10,833——Form 4
Wong-Sarad GracePrincipal Accounting OfficerApr 16, 2026SELL1,820$2.65$4.8KForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerMar 13, 2026AWARD116,246——Form 4
Berkley Neil LindsayCFO & Chief Business OfficerMar 15, 2026AWARD54,600——Form 4
Wong-Sarad GracePrincipal Accounting OfficerMar 10, 2026SELL1,000$2.65$2.6KForm 4
Wong-Sarad GracePrincipal Accounting OfficerMar 3, 2026SELL3,367$2.08$7.0KForm 4
Wong-Sarad GracePrincipal Accounting OfficerMar 2, 2026SELL8,071$2.12$17.1KForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerMar 2, 2026SELL81,864$2.12$173.8KForm 4
Berkley Neil LindsayCFO & Chief Business OfficerMar 2, 2026SELL29,649$2.12$63.0KForm 4
Wong-Sarad GracePrincipal Accounting OfficerFeb 26, 2026SELL4,079$2.50$10.2KForm 4
Wong-Sarad GracePrincipal Accounting OfficerDec 5, 2025SELL4,753$1.21$5.8KForm 4
Wong-Sarad GracePrincipal Accounting OfficerDec 3, 2025SELL8,056$1.12$9.0KForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerDec 3, 2025SELL104,347$1.12$116.8KForm 4
Kenkare-Mitra SaraPresident and Head of R&DDec 3, 2025SELL41,687$1.12$46.7KForm 4
Berkley Neil LindsayChief Bus Ofcr & Interim CFODec 3, 2025SELL37,261$1.12$41.7KForm 4
Wong-Sarad GracePrincipal Accounting OfficerNov 10, 2025AWARD32,343——Form 4
Wong-Sarad GracePrincipal Accounting OfficerNov 10, 2025AWARD48,535$1.31$63.6KForm 4
Berkley Neil LindsayChief Bus Ofcr & Interim CFONov 10, 2025AWARD65,000——Form 4
Berkley Neil LindsayChief Bus Ofcr & Interim CFONov 10, 2025AWARD195,000$1.31$255.4KForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerNov 10, 2025AWARD174,167——Form 4
Rosenthal Arnondirector, officer: Chief Executive OfficerNov 10, 2025AWARD522,500$1.31$684.5KForm 4
Wong-Sarad GracePrincipal Accounting OfficerSep 2, 2025SELL5,910$2.50$14.8KForm 4
Berkley Neil LindsayPrincipal Financial OfficerSep 2, 2025SELL15,842$2.50$39.6KForm 4
Kenkare-Mitra SaraPresident and Head of R&DSep 2, 2025SELL23,638$2.50$59.0KForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerSep 2, 2025SELL51,562$2.50$128.7KForm 4
Hammond PauladirectorAug 26, 2025SELL14,000$2.36$33.0KForm 4
Berkley Neil LindsayPrincipal Financial OfficerJul 1, 2025AWARD18,000$1.42$25.6KForm 4
Kenkare-Mitra SaraPresident and Head of R&DJul 1, 2025AWARD54,725——Form 4
Kenkare-Mitra SaraPresident and Head of R&DJul 1, 2025AWARD18,250$1.42$25.9KForm 4
Rosenthal Arnondirector, officer: Chief Executive OfficerJul 1, 2025AWARD137,125——Form 4
Rosenthal Arnondirector, officer: Chief Executive OfficerJul 1, 2025AWARD45,700$1.42$64.9KForm 4
Berkley Neil LindsayPrincipal Financial OfficerJun 20, 2025OTHER0——Form 4
Berkley Neil LindsayPrincipal Financial OfficerJun 20, 2025OTHER12,975$1.10$14.3KForm 4
Wong-Sarad GracePrincipal Accounting OfficerJun 20, 2025OTHER0——Form 4
Wong-Sarad GracePrincipal Accounting OfficerJun 20, 2025OTHER2,845$1.10$3.1KForm 4
Wong-Sarad GracePrincipal Accounting OfficerJun 20, 2025OTHER20,454$10.24$209.4KForm 4
Wong-Sarad GracePrincipal Accounting OfficerJun 20, 2025OTHER11,309$9.46$107.0KForm 4
Wong-Sarad GracePrincipal Accounting OfficerJun 20, 2025OTHER10,228$13.56$138.7KForm 4
Wong-Sarad GracePrincipal Accounting OfficerJun 20, 2025OTHER20,000$16.46$329.2KForm 4
Wong-Sarad GracePrincipal Accounting OfficerJun 20, 2025OTHER13,842$17.15$237.4KForm 4
Wong-Sarad GracePrincipal Accounting OfficerJun 20, 2025OTHER11,552$23.70$273.8KForm 4
Yaffe KristinedirectorJun 20, 2025SELL1,000$1.44$1.4KForm 4
Hammond PauladirectorJun 11, 2025AWARD28,700——Form 4
Hammond PauladirectorJun 11, 2025AWARD9,450$1.63$15.4KForm 4
Yaffe KristinedirectorJun 11, 2025AWARD28,700——Form 4
Yaffe KristinedirectorJun 11, 2025AWARD9,450$1.63$15.4KForm 4