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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 $192.7M in total; no superinvestor holds it.

13F holders, Q2 2025

Institutional positions in Alector, Inc. as of Jun 30, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works

Institutional holders
136
−5 vs. Q1 2025
Shares held
70.5M
−2.11M (−2.9%) vs. Q1 2025
Total value
$98.7M
+$9.57M (+10.7%) vs. Q1 2025
New holders
17
47 more added
Sold out
22
37 more reduced

Compare with Q1 2025: new holders, sold out and not filed yet

Holders and value by quarter

Institutions reporting ALEC on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.

Institutional holdersQ2 2025: 136 institutions
Q1 2021: 127 institutionsQ2 2021: 138 institutionsQ3 2021: 145 institutionsQ4 2021: 167 institutionsQ1 2022: 166 institutionsQ2 2022: 154 institutionsQ3 2022: 168 institutionsQ4 2022: 155 institutionsQ1 2023: 149 institutionsQ2 2023: 145 institutionsQ3 2023: 149 institutionsQ4 2023: 148 institutionsQ1 2024: 157 institutionsQ2 2024: 160 institutionsQ3 2024: 159 institutionsQ4 2024: 150 institutionsQ1 2025: 141 institutionsQ2 2025: 136 institutionsQ3 2025: 149 institutionsQ4 2025: 131 institutionsQ1 2026: 138 institutionsQ2 2026: 140 institutions
Value heldQ2 2025: $99.2M
Q1 2021: $931.7MQ2 2021: $1.02BQ3 2021: $1.19BQ4 2021: $1.14BQ1 2022: $789.9MQ2 2022: $546.8MQ3 2022: $517.1MQ4 2022: $506.0MQ1 2023: $400.9MQ2 2023: $354.5MQ3 2023: $411.0MQ4 2023: $562.1MQ1 2024: $496.8MQ2 2024: $337.9MQ3 2024: $351.1MQ4 2024: $138.8MQ1 2025: $89.8MQ2 2025: $99.2MQ3 2025: $221.6MQ4 2025: $132.3MQ1 2026: $190.0MQ2 2026: $192.7M
Institutions holding ALEC and their total value by quarter
QuarterHoldersValue
Q2 2026140$192.7M
Q1 2026138$190.0M
Q4 2025131$132.3M
Q3 2025149$221.6M
Q2 2025136$99.2M
Q1 2025141$89.8M
Q4 2024150$138.8M
Q3 2024159$351.1M
Q2 2024160$337.9M
Q1 2024157$496.8M
Q4 2023148$562.1M
Q3 2023149$411.0M
Q2 2023145$354.5M
Q1 2023149$400.9M
Q4 2022155$506.0M
Q3 2022168$517.1M
Q2 2022154$546.8M
Q1 2022166$789.9M
Q4 2021167$1.14B
Q3 2021145$1.19B
Q2 2021138$1.02B
Q1 2021127$931.7M

Institutions, Q2 2025

Shares, value and share of portfolio for each institution holding Alector, Inc.; share changes are against Q1 2025.

Institutions holding ALEC in Q2 2025
InstitutionSharesValue% of portfolioChange in sharesAction
FMR LLC14,998,889$21.0M0.00%+608,650+4.2%Added
BlackRock, Inc.7,973,580$11.2M0.00%−306,122−3.7%Reduced
Vanguard Group Inc5,987,704$8.38M0.00%−65,337−1.1%Reduced
Price T Rowe Associates Inc4,875,264$6.83M0.00%+4,198,951+620.9%Added
Merck & Co., Inc.3,545,719$4.96M2.30%00.0%Unchanged
Acadian Asset Management LLC2,170,388$3.03M0.01%+729,727+50.7%Added
Eversept Partners, LP1,986,072$2.78M0.28%+1,368,654+221.7%Added
Geode Capital Management, LLC1,982,068$2.78M0.00%+19,970+1.0%Added
ADAR1 Capital Management, LLC1,723,526$2.41M0.39%+1,343,196+353.2%Added
State Street Corp1,709,902$2.39M0.00%+69,640+4.2%Added
Jacobs Levy Equity Management, Inc1,322,882$1.85M0.01%−11,150−0.8%Reduced
Euclidean Capital LLC1,307,858$1.83M0.60%00.0%Unchanged
Renaissance Technologies LLC1,254,850$1.76M0.00%+220,995+21.4%Added
Deerfield Management Company, L.P. (Series C)1,055,192$1.48M0.03%00.0%Unchanged
5AM Venture Management, LLC995,841$1.39M0.54%00.0%Unchanged
Deutsche Bank AG989,747$1.39M0.00%−111,800−10.1%Reduced
Vestal Point Capital, LP976,992$1.37M0.07%+472,452+93.6%Added
DAFNA Capital Management LLC912,928$1.28M0.35%00.0%Unchanged
Ikarian Capital, LLC900,000$1.26M0.42%−50,000−5.3%Reduced
Sio Capital Management, LLC845,531$1.18M0.48%+8,372+1.0%Added
Northern Trust Corp658,161$921.4K0.00%−39,068−5.6%Reduced
TD Asset Management Inc651,738$912.4K0.00%+540,000+483.3%Added
Charles Schwab Investment Management Inc647,653$906.7K0.00%+22,923+3.7%Added
Morgan Stanley606,552$849.2K0.00%+259,845+74.9%Added
Citadel Advisors LLC551,820$772.5K0.00%+546,382+10,047.5%Added
D. E. Shaw & Co., Inc.534,200$747.9K0.00%+64,899+13.8%Added
Panagora Asset Management Inc516,680$723.4K0.00%+150,135+41.0%Added
Boothbay Fund Management, LLC458,863$642.4K0.02%+184,503+67.2%Added
Millennium Management LLC410,803$575.1K0.00%+145,987+55.1%Added
AQR Capital Management LLC406,618$569.3K0.00%−85,974−17.5%Reduced
Dimensional Fund Advisors LP383,331$536.9K0.00%−106,003−21.7%Reduced
Two Sigma Advisers, LP377,000$527.8K0.00%−15,900−4.0%Reduced
Goldman Sachs Group Inc374,477$524.3K0.00%+62,332+20.0%Added
Royal Bank of Canada367,188$513.0K0.00%+362,395+7,560.9%Added
Bank of America Corp343,909$481.5K0.00%+5,927+1.8%Added
New Leaf Venture Partners, L.L.C.339,569$475.4K1.44%00.0%Unchanged
Manufacturers Life Insurance Company, The313,578$439.0K0.00%+189,686+153.1%Added
Mackenzie Financial Corp274,442$384.2K0.00%+274,442New
Bank of New York Mellon Corp268,872$376.4K0.00%+19,378+7.8%Added
Walleye Capital LLC266,204$372.7K0.00%−39,397−12.9%Reduced
Diadema Partners LP266,023$372.4K0.23%−190,523−41.7%Reduced
State of Wyoming223,092$312.3K0.04%+26,278+13.4%Added
Two Sigma Investments, LP222,139$311.0K0.00%+7,714+3.6%Added
Susquehanna International Group, LLP203,798$285.3K0.00%−49,321−19.5%Reduced
Alphabet Inc.175,866$246.2K0.01%00.0%Unchanged
Invesco Ltd.175,801$246.1K0.00%+27,225+18.3%Added
Barclays PLC169,795$237.7K0.00%+44,709+35.7%Added
Medici Capital LLC167,191$234.1K0.27%00.0%Unchanged
Nuveen, LLC155,613$217.9K0.00%+17,433+12.6%Added
Los Angeles Capital Management LLC151,896$212.7K0.00%+7,600+5.3%Added
Gsa Capital Partners LLP150,669$211.0K0.01%+150,669New
Rhumbline Advisers126,568$177.2K0.00%+9,933+8.5%Added
Bridgeway Capital Management, LLC115,000$161.0K0.00%+115,000New
STRS Ohio110,400$154.6K0.00%+7,800+7.6%Added
DekaBank Deutsche Girozentrale100,000$148.0K0.00%00.0%Unchanged
Russell Investments Group, Ltd.100,366$144.3K0.00%+46,945+87.9%Added
Alliancebernstein L.P.92,940$130.1K0.00%+10,840+13.2%Added
XTX Topco Ltd73,338$102.7K0.00%+40,767+125.2%Added
Susquehanna Fundamental Investments, LLC70,778$99.1K0.00%−67,126−48.7%Reduced
Spears Abacus Advisors LLC61,513$86.1K0.00%−100−0.2%Reduced
Persistent Asset Partners Ltd61,096$85.5K0.07%−43,831−41.8%Reduced
Ieq Capital, LLC58,998$82.6K0.00%−21,408−26.6%Reduced
Velan Capital Investment Management LP55,000$77.0K0.08%00.0%Unchanged
HSBC Holdings PLC51,700$73.9K0.00%−6,372−11.0%Reduced
Bank of Montreal52,380$73.3K0.00%+52,380New
JustInvest LLC52,095$72.9K0.00%+17,170+49.2%Added
Utah Retirement Systems51,430$72.0K0.00%00.0%Unchanged
Wells Fargo & Company50,601$70.8K0.00%+11,166+28.3%Added
Citigroup Inc49,461$69.2K0.00%−13,295−21.2%Reduced
Mirae Asset Global ETFs Holdings Ltd.46,286$64.8K0.00%−28,362−38.0%Reduced
JPMorgan Chase & Co45,491$63.7K0.00%−1,440,658−96.9%Reduced
Algert Global LLC44,460$62.2K0.00%00.0%Unchanged
UBS Group AG41,893$58.6K0.00%−41,153−49.6%Reduced
Tudor Investment Corp Et Al40,795$57.1K0.00%−10.0%Reduced
Intech Investment Management LLC39,915$55.9K0.00%−20,836−34.3%Reduced
Vontobel Holding Ltd.38,000$53.2K0.00%+8,000+26.7%Added
Jasper Ridge Partners, L.P.30,632$42.9K0.00%00.0%Unchanged
Blackstone Group Inc.25,715$36.0K0.00%00.0%Unchanged
CWM, LLC25,897$36.0K0.00%−7,746−23.0%Reduced
State Board of Administration of Florida Retirement System25,570$35.8K0.00%00.0%Unchanged
Apollon Wealth Management, LLC25,000$35.0K0.00%00.0%Unchanged
Voya Investment Management LLC24,621$34.5K0.00%00.0%Unchanged
Jane Street Group, LLC23,952$33.5K0.00%−232,599−90.7%Reduced
Cerity Partners LLC23,736$33.2K0.00%−17,828−42.9%Reduced
Cubist Systematic Strategies, LLC21,819$30.5K0.00%+21,819New
Graham Capital Management, L.P.21,373$29.9K0.00%−19,725−48.0%Reduced
Prudential Financial Inc21,322$29.9K0.00%+21,322New
Erste Asset Management GmbH19,000$28.1K0.00%00.0%Unchanged
China Universal Asset Management Co., Ltd.20,083$28.1K0.00%+208+1.0%Added
ProShare Advisors LLC20,078$28.1K0.00%−2,143−9.6%Reduced
FNY Investment Advisers, LLC20,000$28.0K0.01%+10,000+100.0%Added
Police & Firemen's Retirement System of New Jersey17,004$23.8K0.00%00.0%Unchanged
SEI Investments Co16,884$23.6K0.00%00.0%Unchanged
DLK Investment Management, LLC15,500$21.7K0.01%+4,000+34.8%Added
Ameriprise Financial Inc14,135$19.8K0.00%+3,449+32.3%Added
Diversified Trust Co14,102$19.7K0.00%00.0%Unchanged
Shell Asset Management Co13,887$19.0K0.00%−6,740−32.7%Reduced
Tower Research Capital LLC (TRC)13,399$18.8K0.00%−9,271−40.9%Reduced
US Bancorp12,427$17.4K0.00%−1,227−9.0%Reduced
BNP Paribas Arbitrage, SA11,634$16.3K0.00%−145,675−92.6%Reduced