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ALEC Insider Trading

Insider Ownership Percentage: 9.70%
Insider Buying (Last 12 Months): $0.00
Insider Selling (Last 12 Months): $263,568.12

Alector Insider Trading History Chart

This chart shows the insider buying and selling history at Alector by year and by quarter.

Skip ChartChart Data in Insider Trading History Table

Alector Share Price & Price History

Current Price: $1.21
Price Change: ▲ Price Increase of +0.07 (6.14%)
As of 12/4/2025 05:00 PM ET

This chart shows the closing price history over time for ALEC up to the past year.

Skip Chart and Table DataPrice Data in Insider Trading History Table
Days: 30 | 90 | 365

Alector Insider Trading History

Transaction DateInsider NameTitleBuy/SellNumber of SharesAverage Share PriceTotal TransactionShares Held After TransactionDetails
12/3/2025Arnon RosenthalCEOSell104,347$1.12$116,868.642,420,040View SEC Filing Icon  
12/3/2025Grace Wong-SaradInsiderSell8,056$1.12$9,022.72127,735View SEC Filing Icon  
12/3/2025Neil Lindsay BerkleyCFOSell37,261$1.12$41,732.32374,309View SEC Filing Icon  
12/3/2025Sara Kenkare-MitraInsiderSell41,687$1.12$46,689.44501,652View SEC Filing Icon  
9/2/2025Grace Wong-SaradInsiderSell5,910$2.50$14,775.00103,448View SEC Filing Icon  
8/26/2025Paula HammondDirectorSell14,000$2.36$33,040.0074,909View SEC Filing Icon  
6/20/2025Kristine YaffeDirectorSell1,000$1.44$1,440.0095,409View SEC Filing Icon  
12/2/2024Arnon RosenthalCEOSell52,172$2.52$131,473.442,507,074View SEC Filing Icon  
12/2/2024Marc GrassoCFOSell16,489$2.52$41,552.28330,651View SEC Filing Icon  
12/2/2024Sara Kenkare-MitraInsiderSell26,500$2.52$66,780.00565,215View SEC Filing Icon  
9/3/2024Arnon RosenthalCEOSell26,499$4.88$129,315.121,948,746View SEC Filing Icon  
9/3/2024Marc GrassoCFOSell7,297$4.88$35,609.36130,740View SEC Filing Icon  
9/3/2024Sara Kenkare-MitraInsiderSell13,926$4.88$67,958.88291,715View SEC Filing Icon  
8/12/2024Paula HammondDirectorSell10,500$5.06$53,130.0060,209View SEC Filing Icon  
6/3/2024Arnon RosenthalCEOSell25,135$4.80$120,648.001,975,245View SEC Filing Icon  
6/3/2024Gary RomanoInsiderSell8,040$4.80$38,592.00188,273View SEC Filing Icon  
6/3/2024Marc GrassoCFOSell6,920$4.80$33,216.00138,037View SEC Filing Icon  
3/4/2024Arnon RosenthalCEOSell18,837$6.92$130,352.042,000,380View SEC Filing Icon  
3/4/2024Gary RomanoInsiderSell6,001$6.92$41,526.92196,313View SEC Filing Icon  
3/4/2024Marc GrassoCFOSell5,716$6.92$39,554.72144,957View SEC Filing Icon  
12/4/2023Arnon RosenthalCEOSell23,831$5.56$132,500.362,019,217View SEC Filing Icon  
12/4/2023Gary RomanoInsiderSell5,035$5.56$27,994.60202,314View SEC Filing Icon  
12/4/2023Marc GrassoCFOSell4,574$5.56$25,431.44150,673View SEC Filing Icon  
9/11/2023Polaris Venture Management Co.Major ShareholderSell500,000$6.00$3,000,000.0010,853,817View SEC Filing Icon  
9/5/2023Arnon RosenthalCEOSell5,647$5.19$29,307.931,645,448View SEC Filing Icon  
9/5/2023Marc GrassoCFOSell1,114$5.19$5,781.6632,247View SEC Filing Icon  
9/5/2023Sara Kenkare-MitraInsiderSell6,214$5.19$32,250.66177,935View SEC Filing Icon  
6/2/2023Arnon RosenthalCEOSell5,255$6.90$36,259.501,651,095View SEC Filing Icon  
6/2/2023Marc GrassoCFOSell1,050$6.90$7,245.0033,361View SEC Filing Icon  
6/2/2023Sara Kenkare-MitraInsiderSell4,092$6.90$28,234.80184,149View SEC Filing Icon  
3/17/2023Arnon RosenthalCEOSell15,186$6.22$94,456.921,656,350View SEC Filing Icon  
3/2/2023Arnon RosenthalCEOSell5,849$8.32$48,663.681,628,546View SEC Filing Icon  
3/2/2023Gary RomanoInsiderSell3,238$8.32$26,940.16104,737View SEC Filing Icon  
3/2/2023Marc GrassoCFOSell1,291$8.32$10,741.1234,411View SEC Filing Icon  
See Full Table

SEC Filings (Institutional Ownership Changes) for Alector (NASDAQ:ALEC)

85.83% of Alector stock is owned by institutions. Institutional ownership can be a sign of analyst confidence in the fundamentals of the stock.

Institutional Buying and Selling by Quarter

This chart shows the instiutional buying and selling at ALEC by year and by quarter.

Skip Institutional Buying and Selling Chart and Table DataRead Chart Data in Institutional Trading History Table

Alector Institutional Trading History

Reporting DateHedge FundShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
11/17/2025Jasper Ridge Partners L.P.71,776$0.21M0.0%+134.3%0.066%Search for SEC Filing on Google Icon
11/17/2025Jacobs Levy Equity Management Inc.1,230,974$3.64M0.0%-6.9%1.128%Search for SEC Filing on Google Icon
11/17/2025Utah Retirement Systems72,002$0.21M0.0%+40.0%0.066%Search for SEC Filing on Google Icon
11/17/2025Public Employees Retirement System of Ohio68,200$0.20M0.0%+763.3%0.062%Search for SEC Filing on Google Icon
11/17/2025Millennium Management LLC1,155,027$3.42M0.0%+181.2%1.058%Search for SEC Filing on Google Icon
11/17/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.32,129$95K0.0%-30.6%0.029%Search for SEC Filing on Google Icon
11/17/2025Bank of America Corp DE246,283$0.73M0.0%-28.4%0.226%Search for SEC Filing on Google Icon
11/17/2025Boothbay Fund Management LLC524,077$1.55M0.0%+14.2%0.480%Search for SEC Filing on Google Icon
11/17/2025Ameriprise Financial Inc.274,042$0.81M0.0%+1,838.7%0.251%Search for SEC Filing on Google Icon
11/14/2025Two Sigma Investments LP307,179$0.91M0.0%+38.3%0.281%Search for SEC Filing on Google Icon
11/13/2025UBS Group AG230,499$0.68M0.0%+450.2%0.211%Search for SEC Filing on Google Icon
11/13/2025Mackenzie Financial Corp283,712$0.84M0.0%+3.4%0.260%Search for SEC Filing on Google Icon
11/12/2025Barclays PLC873,375$2.59M0.0%+414.4%0.800%Search for SEC Filing on Google Icon
11/12/2025Dimensional Fund Advisors LP295,846$0.88M0.0%-22.8%0.271%Search for SEC Filing on Google Icon
11/10/2025TD Asset Management Inc273,738$0.81M0.0%-58.0%0.251%Search for SEC Filing on Google Icon
11/10/2025Persistent Asset Partners Ltd31,240$92K0.1%-48.9%0.029%Search for SEC Filing on Google Icon
11/7/2025Vanguard Group Inc.6,034,659$17.86M0.0%+0.8%5.963%Search for SEC Filing on Google Icon
11/7/2025JPMorgan Chase & Co.136,385$0.40M0.0%+199.8%0.135%Search for SEC Filing on Google Icon
11/6/2025Lexington Partners L.P.10,108$30K0.0%N/A0.010%Search for SEC Filing on Google Icon
11/6/2025Rhumbline Advisers114,270$0.34M0.0%-9.7%0.113%Search for SEC Filing on Google Icon
11/5/2025Savant Capital LLC11,698$35K0.0%N/A0.012%Search for SEC Filing on Google Icon
11/3/2025Pinegrove Venture Partners LLC10,286$30K0.1%N/A0.010%Search for SEC Filing on Google Icon
10/29/2025Wealth Enhancement Advisory Services LLC11,970$37K0.0%N/A0.012%Search for SEC Filing on Google Icon
10/27/2025Belvedere Trading LLC10,486$31K0.0%N/A0.010%Search for SEC Filing on Google Icon
10/16/2025HBK Sorce Advisory LLC11,171$34K0.0%N/A0.011%Search for SEC Filing on Google Icon
10/15/2025Vontobel Holding Ltd.26,000$77K0.0%-31.6%0.026%Search for SEC Filing on Google Icon
10/14/2025HBK Sorce Advisory LLC11,171$34K0.0%N/A0.011%Search for SEC Filing on Google Icon
10/9/2025Voya Investment Management LLC13,929$41K0.0%-43.4%0.014%Search for SEC Filing on Google Icon
10/7/2025Hamilton Lane Advisors LLC14,402$43K0.0%N/A0.014%Search for SEC Filing on Google Icon
8/19/2025State of Wyoming223,092$0.31M0.0%+13.4%0.220%Search for SEC Filing on Google Icon
8/15/2025Boothbay Fund Management LLC458,863$0.64M0.0%+67.2%0.453%Search for SEC Filing on Google Icon
8/15/2025Bridgeway Capital Management LLC115,000$0.16M0.0%N/A0.114%Search for SEC Filing on Google Icon
8/15/2025Bank of America Corp DE343,909$0.48M0.0%+1.8%0.340%Search for SEC Filing on Google Icon
8/14/2025Jane Street Group LLC23,952$34K0.0%-90.7%0.024%Search for SEC Filing on Google Icon
8/14/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.46,286$65K0.0%-38.0%0.046%Search for SEC Filing on Google Icon
8/14/2025The Manufacturers Life Insurance Company 313,578$0.44M0.0%+153.1%0.310%Search for SEC Filing on Google Icon
8/14/2025Diadema Partners LP266,023$0.37M0.1%-41.7%0.263%Search for SEC Filing on Google Icon
8/14/2025Cerity Partners LLC23,736$33K0.0%-42.9%0.023%Search for SEC Filing on Google Icon
8/13/2025Walleye Capital LLC266,204$0.37M0.0%-12.9%0.263%Search for SEC Filing on Google Icon
8/13/2025Invesco Ltd.175,801$0.25M0.0%+18.3%0.174%Search for SEC Filing on Google Icon
8/13/2025Sio Capital Management LLC845,531$1.18M0.5%+1.0%0.835%Search for SEC Filing on Google Icon
8/13/2025Panagora Asset Management Inc.516,680$0.72M0.0%+41.0%0.511%Search for SEC Filing on Google Icon
8/13/2025Russell Investments Group Ltd.100,366$0.14M0.0%+87.9%0.099%Search for SEC Filing on Google Icon
8/12/2025XTX Topco Ltd73,338$0.10M0.0%+125.2%0.072%Search for SEC Filing on Google Icon
8/12/2025Prudential Financial Inc.21,322$30K0.0%N/A0.021%Search for SEC Filing on Google Icon
8/12/2025JPMorgan Chase & Co.45,491$64K0.0%-96.9%0.045%Search for SEC Filing on Google Icon
8/11/2025Persistent Asset Partners Ltd61,096$86K0.1%-41.8%0.060%Search for SEC Filing on Google Icon
8/8/2025Intech Investment Management LLC39,915$56K0.0%-34.3%0.040%Search for SEC Filing on Google Icon
8/8/2025Geode Capital Management LLC1,982,068$2.78M0.0%+1.0%1.982%Search for SEC Filing on Google Icon
8/7/2025Acadian Asset Management LLC2,170,388$3.03M0.0%+50.7%2.171%Search for SEC Filing on Google Icon
8/7/2025Los Angeles Capital Management LLC151,896$0.21M0.0%+5.3%0.152%Search for SEC Filing on Google Icon
8/5/2025Bank of Montreal Can52,380$73K0.0%N/A0.052%Search for SEC Filing on Google Icon
7/30/2025FNY Investment Advisers LLC20,000$28K0.0%+100.0%0.020%Search for SEC Filing on Google Icon
7/28/2025TD Asset Management Inc651,738$0.91M0.0%+483.3%0.652%Search for SEC Filing on Google Icon
7/25/2025CWM LLC25,897$36K0.0%-23.0%0.026%Search for SEC Filing on Google Icon
7/25/2025Vanguard Personalized Indexing Management LLC52,095$73K0.0%+49.2%0.052%Search for SEC Filing on Google Icon
7/23/2025Vontobel Holding Ltd.38,000$53K0.0%+26.7%0.038%Search for SEC Filing on Google Icon
6/27/2025Goldman Sachs Group Inc.312,145$0.38M0.0%-23.7%0.312%Search for SEC Filing on Google Icon
5/28/2025Strs Ohio102,600$0.13M0.0%N/A0.103%Search for SEC Filing on Google Icon
5/21/2025Acadian Asset Management LLC1,440,661$1.77M0.0%+39.8%1.441%Search for SEC Filing on Google Icon
5/19/2025Jane Street Group LLC256,551$0.32M0.0%+4.7%0.257%Search for SEC Filing on Google Icon
5/16/2025Goldman Sachs Group Inc.312,145$0.38M0.0%-23.7%0.312%Search for SEC Filing on Google Icon
5/16/2025Jacobs Levy Equity Management Inc.1,334,032$1.64M0.0%+25.9%1.334%Search for SEC Filing on Google Icon
5/16/2025AQR Capital Management LLC492,592$0.61M0.0%-12.5%0.493%Search for SEC Filing on Google Icon
5/16/2025Almitas Capital LLC321,568$0.40M0.1%+12.9%0.322%Search for SEC Filing on Google Icon
5/16/2025ADAR1 Capital Management LLC380,330$0.47M0.1%+3.3%0.380%Search for SEC Filing on Google Icon
5/15/2025Vestal Point Capital LP504,540$0.62M0.0%N/A0.505%Search for SEC Filing on Google Icon
5/15/2025State of Wyoming196,814$0.24M0.0%N/A0.197%Search for SEC Filing on Google Icon
5/14/2025Ieq Capital LLC80,406$99K0.0%N/A0.080%Search for SEC Filing on Google Icon
5/14/2025Walleye Capital LLC305,601$0.38M0.0%+108.3%0.306%Search for SEC Filing on Google Icon
5/13/2025Persistent Asset Partners Ltd104,927$0.13M0.1%N/A0.105%Search for SEC Filing on Google Icon
5/12/2025Nuveen LLC138,180$0.17M0.0%N/A0.138%Search for SEC Filing on Google Icon
5/12/2025Invesco Ltd.148,576$0.18M0.0%+209.6%0.149%Search for SEC Filing on Google Icon
5/9/2025Charles Schwab Investment Management Inc.624,730$0.77M0.0%-2.9%0.625%Search for SEC Filing on Google Icon
5/8/2025XTX Topco Ltd32,571$40K0.0%-36.1%0.033%Search for SEC Filing on Google Icon
5/1/2025CWM LLC33,643$41K0.0%+370.7%0.034%Search for SEC Filing on Google Icon
4/30/2025Cerity Partners LLC41,564$51K0.0%N/A0.042%Search for SEC Filing on Google Icon
4/29/2025Bank of New York Mellon Corp249,494$0.31M0.0%+8.1%0.252%Search for SEC Filing on Google Icon
2/17/2025UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC160,570$0.30M0.0%+12.2%0.164%Search for SEC Filing on Google Icon
2/17/2025Velan Capital Investment Management LP55,000$0.10M0.1%N/A0.056%Search for SEC Filing on Google Icon
2/17/2025Squarepoint Ops LLC13,114$25K0.0%N/A0.013%Search for SEC Filing on Google Icon
2/17/2025Two Sigma Advisers LP429,900$0.81M0.0%+8.9%0.439%Search for SEC Filing on Google Icon
2/17/2025Two Sigma Investments LP407,989$0.77M0.0%+55.4%0.417%Search for SEC Filing on Google Icon
2/17/2025Tema Etfs LLC14,344$27K0.0%N/A0.015%Search for SEC Filing on Google Icon
2/17/2025Sphera Funds Management LTD.324,639$0.61M0.1%-47.6%0.332%Search for SEC Filing on Google Icon
2/17/2025ProShare Advisors LLC27,367$52K0.0%+30.3%0.028%Search for SEC Filing on Google Icon
2/17/2025Nuveen Asset Management LLC187,042$0.35M0.0%-28.1%0.191%Search for SEC Filing on Google Icon
2/17/2025OCONNOR A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS LLC50,000$94K0.0%N/A0.051%Search for SEC Filing on Google Icon
2/17/2025Millennium Management LLC74,685$0.14M0.0%+45.8%0.076%Search for SEC Filing on Google Icon
2/17/2025Jacobs Levy Equity Management Inc.1,059,691$2M0.0%+4.1%1.082%Search for SEC Filing on Google Icon
2/17/2025D. E. Shaw & Co. Inc.368,977$0.70M0.0%+93.2%0.377%Search for SEC Filing on Google Icon
2/17/2025Deutsche Bank AG1,106,287$2.09M0.0%-4.2%1.130%Search for SEC Filing on Google Icon
2/17/2025Deerfield Management Company L.P. Series C1,066,962$2.02M0.0%+1.1%1.090%Search for SEC Filing on Google Icon
2/17/2025BNP Paribas Financial Markets165,589$0.31M0.0%+723.0%0.169%Search for SEC Filing on Google Icon
2/17/2025Algert Global LLC44,460$84K0.0%-28.2%0.045%Search for SEC Filing on Google Icon
2/17/2025Almitas Capital LLC284,845$0.54M0.1%N/A0.291%Search for SEC Filing on Google Icon
2/17/20255AM Venture Management LLC995,841$1.88M0.4%N/A1.017%Search for SEC Filing on Google Icon
2/14/2025RA Capital Management L.P.9,695,228$18.32M0.2%N/A9.900%Search for SEC Filing on Google Icon
2/14/2025Jane Street Group LLC244,933$0.46M0.0%+58.1%0.250%Search for SEC Filing on Google Icon
2/14/2025Northern Trust Corp759,874$1.44M0.0%+5.6%0.776%Search for SEC Filing on Google Icon
Data available starting January 2016

See Full Table
Alector logo
Alector, Inc., a clinical stage biopharmaceutical company, develops therapies for the treatment of neurodegeneration diseases. Its products include AL001, an immune activity in the brain with genetic links to multiple neurodegenerative disorders, which is in Phase III clinical trial for the treatment of frontotemporal dementia, Alzheimer's, Parkinson's, and amyotrophic lateral sclerosis diseases; and AL101 that is in Phase I clinical trial for the treatment of neurodegenerative diseases, including Alzheimer's and Parkinson's diseases. The company also offers AL002, a product candidate that is in Phase II clinical trial for the treatment of Alzheimer's disease. Alector, Inc. has a collaboration agreement with Adimab, LLC for the research and development of antibodies; and a strategic collaboration agreement with GlaxoSmithKline plc for the development and commercialization of monoclonal antibodies, such as AL001 and AL101 to treat neurodegenerative diseases. The company was founded in 2013 and is headquartered in South San Francisco, California.
Read More on Alector

Today's Range

Now: $1.21
Low: $1.11
High: $1.25

50 Day Range

MA: $1.97
Low: $1.14
High: $3.32

52 Week Range

Now: $1.21
Low: $0.87
High: $3.40

Volume

2,787,796 shs

Average Volume

1,574,888 shs

Market Capitalization

$132.07 million

P/E Ratio

N/A

Dividend Yield

N/A

Beta

0.67

Who are the company insiders with the largest holdings of Alector?

Alector's top insider investors include:
  1. Arnon Rosenthal (CEO)
  2. Sara Kenkare-Mitra (Insider)
  3. Neil Lindsay Berkley (CFO)
  4. Marc Grasso (CFO)
  5. Gary Romano (Insider)
  6. Grace Wong-Sarad (Insider)
  7. Kristine Yaffe (Director)
  8. Paula Hammond (Director)
Learn More about top insider investors at Alector.

Who are the major institutional investors of Alector?

Alector's top institutional investors include:
  1. Vanguard Group Inc. — 5.96%
  2. Jacobs Levy Equity Management Inc. — 1.13%
  3. Millennium Management LLC — 1.06%
  4. Barclays PLC — 0.80%
  5. Boothbay Fund Management LLC — 0.48%
  6. Two Sigma Investments LP — 0.28%
Learn More about top institutional investors of Alector stock.

Which major investors are selling Alector stock?

During the previous quarter, ALEC stock was sold by these institutional investors:
  1. TD Asset Management Inc
  2. Bank of America Corp DE
  3. Jacobs Levy Equity Management Inc.
  4. Dimensional Fund Advisors LP
  5. Persistent Asset Partners Ltd
  6. MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.
  7. Rhumbline Advisers
  8. Vontobel Holding Ltd.
During the previous year, company insiders that have sold Alector company stock include:
  1. Arnon Rosenthal (CEO)
  2. Sara Kenkare-Mitra (Insider)
  3. Neil Lindsay Berkley (CFO)
  4. Marc Grasso (CFO)
  5. Gary Romano (Insider)
  6. Grace Wong-Sarad (Insider)
Learn More investors selling Alector stock.

Which major investors are buying Alector stock?

Within the previous quarter, ALEC stock was purchased by institutional investors including:
  1. Millennium Management LLC
  2. Barclays PLC
  3. Ameriprise Financial Inc.
  4. UBS Group AG
  5. Susquehanna International Group LLP
  6. JPMorgan Chase & Co.
  7. Two Sigma Investments LP
  8. Boothbay Fund Management LLC