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ALEC Insider Trading

Insider Ownership Percentage: 8.30%
Insider Buying (Last 12 Months): $0.00
Insider Selling (Last 12 Months): $286,989.75

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: $2.12
Price Change: ▲ Price Increase of +0.01 (0.47%)
As of 05/20/2026 04:00 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
4/16/2026Grace Wong-SaradInsiderSell1,820$2.65$4,823.00104,645View SEC Filing Icon  
3/10/2026Grace Wong-SaradInsiderSell1,000$2.65$2,650.00106,465View SEC Filing Icon  
2/26/2026Grace Wong-SaradInsiderSell4,079$2.50$10,197.50118,903View SEC Filing Icon  
12/5/2025Grace Wong-SaradInsiderSell4,753$1.21$5,751.13122,982View SEC Filing Icon  
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  
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
5/19/2026Bank of America Corp DE380,908$0.82M0.0%+183.2%0.343%Search for SEC Filing on Google Icon
5/18/2026ADAR1 Capital Management LLC1,050,000$2.26M0.1%-5.2%0.946%Search for SEC Filing on Google Icon
5/18/2026Eversept Partners LP1,351,106$2.91M0.2%+34.3%1.217%Search for SEC Filing on Google Icon
5/15/2026Affinity Asset Advisors LLC500,000$1.08M0.1%N/A0.450%Search for SEC Filing on Google Icon
5/15/2026Spruce Street Capital LP2,101,068$4.52M1.1%+87.9%1.892%Search for SEC Filing on Google Icon
5/14/2026Renaissance Technologies LLC1,287,691$2.77M0.0%-16.6%1.160%Search for SEC Filing on Google Icon
5/14/2026Sei Investments Co.53,846$0.12M0.0%+218.9%0.048%Search for SEC Filing on Google Icon
5/7/2026Dimensional Fund Advisors LP283,817$0.61M0.0%+42.5%0.256%Search for SEC Filing on Google Icon
5/5/2026Bank of New York Mellon Corp252,297$0.54M0.0%+15.8%0.227%Search for SEC Filing on Google Icon
4/25/2026Strs Ohio86,500$0.19M0.0%-21.6%0.078%Search for SEC Filing on Google Icon
4/16/2026Diversified Trust Co25,895$56K0.0%+83.6%0.023%Search for SEC Filing on Google Icon
2/23/2026Virtu Financial LLC21,886$34K0.0%N/A0.020%Search for SEC Filing on Google Icon
2/19/2026Invesco Ltd.279,468$0.44M0.0%+45.3%0.256%Search for SEC Filing on Google Icon
2/18/2026Mackenzie Financial Corp660,168$1M0.0%+132.7%0.605%Search for SEC Filing on Google Icon
2/18/2026XTX Topco Ltd592,839$0.93M0.0%+501.8%0.543%Search for SEC Filing on Google Icon
2/18/2026Ikarian Capital LLC2,082,606$3.25M0.3%+174.0%1.908%Search for SEC Filing on Google Icon
2/18/2026Utah Retirement Systems133,718$0.21M0.0%+85.7%0.123%Search for SEC Filing on Google Icon
2/18/2026Vestal Point Capital LP755,000$1.18M0.0%-23.0%0.692%Search for SEC Filing on Google Icon
2/18/2026Quadrature Capital Ltd62,273$97K0.0%N/A0.057%Search for SEC Filing on Google Icon
2/18/2026Oxford Asset Management LLP42,905$67K0.0%N/A0.039%Search for SEC Filing on Google Icon
2/18/2026Millennium Management LLC1,332,914$2.08M0.0%+15.4%1.221%Search for SEC Filing on Google Icon
2/18/2026Man Group plc86,162$0.13M0.0%N/A0.079%Search for SEC Filing on Google Icon
2/18/2026Elmind Capital LP900,000$1.40M0.4%N/A0.825%Search for SEC Filing on Google Icon
2/18/2026Eversept Partners LP1,006,163$1.57M0.1%-32.4%0.922%Search for SEC Filing on Google Icon
2/18/2026Balyasny Asset Management L.P.3,265,575$5.09M0.0%N/A2.992%Search for SEC Filing on Google Icon
2/18/2026Boothbay Fund Management LLC559,726$0.87M0.0%+6.8%0.513%Search for SEC Filing on Google Icon
2/18/2026683 Capital Management LLC3,350,000$5.23M0.2%+235.0%3.069%Search for SEC Filing on Google Icon
2/17/2026ADAR1 Capital Management LLC1,108,000$1.73M0.1%N/A1.015%Search for SEC Filing on Google Icon
2/17/2026AQR Capital Management LLC599,569$0.94M0.0%+36.9%0.549%Search for SEC Filing on Google Icon
2/17/2026Medici Capital LLC1,500,520$2.34M1.9%+211.3%1.375%Search for SEC Filing on Google Icon
2/17/2026Price T Rowe Associates Inc. MD56,203$89K0.0%-97.4%0.051%Search for SEC Filing on Google Icon
2/17/2026Public Employees Retirement System of Ohio136,000$0.21M0.0%+99.4%0.125%Search for SEC Filing on Google Icon
2/17/2026Russell Investments Group Ltd.71,887$0.11M0.0%-31.4%0.066%Search for SEC Filing on Google Icon
2/17/2026Graham Capital Management L.P.104,851$0.16M0.0%+394.2%0.096%Search for SEC Filing on Google Icon
2/17/2026Foresite Capital Management IV LLC3,887,200$6.06M2.6%N/A3.561%Search for SEC Filing on Google Icon
2/16/2026Squarepoint Ops LLC77,618$0.12M0.0%N/A0.071%Search for SEC Filing on Google Icon
2/16/2026Spruce Street Capital LP1,117,986$1.74M0.6%N/A1.024%Search for SEC Filing on Google Icon
2/16/2026Panagora Asset Management Inc.850,298$1.33M0.0%+14.7%0.779%Search for SEC Filing on Google Icon
2/16/2026Barclays PLC398,687$0.62M0.0%-54.4%0.365%Search for SEC Filing on Google Icon
2/13/2026Marshall Wace LLP1,166,817$1.82M0.0%+669.4%1.069%Search for SEC Filing on Google Icon
2/13/2026The Manufacturers Life Insurance Company 28,829$45K0.0%-86.7%0.026%Search for SEC Filing on Google Icon
2/13/2026Jacobs Levy Equity Management Inc.2,173,202$3.39M0.0%+76.5%1.991%Search for SEC Filing on Google Icon
2/13/2026Charles Schwab Investment Management Inc.665,491$1.04M0.0%-3.5%0.610%Search for SEC Filing on Google Icon
2/13/2026State Street Corp1,814,298$2.83M0.0%+4.6%1.662%Search for SEC Filing on Google Icon
2/13/2026Dynamic Technology Lab Private Ltd25,881$40K0.0%N/A0.024%Search for SEC Filing on Google Icon
2/13/2026Wells Fargo & Company MN90,108$0.14M0.0%+71.9%0.083%Search for SEC Filing on Google Icon
2/12/2026Renaissance Technologies LLC1,543,650$2.41M0.0%+62.6%1.414%Search for SEC Filing on Google Icon
2/12/2026Dimensional Fund Advisors LP199,126$0.31M0.0%-32.7%0.182%Search for SEC Filing on Google Icon
2/12/2026Jasper Ridge Partners L.P.95,068$0.15M0.0%+32.5%0.087%Search for SEC Filing on Google Icon
2/11/2026Deutsche Bank AG1,035,154$1.62M0.0%-3.1%0.948%Search for SEC Filing on Google Icon
2/10/2026Lexington Partners L.P.53,488$83K0.0%+429.2%0.049%Search for SEC Filing on Google Icon
2/10/2026Hershey Trust Co.20,572$32K0.0%+100.0%0.019%Search for SEC Filing on Google Icon
2/10/2026Goldman Sachs Group Inc.437,959$0.68M0.0%-28.2%0.401%Search for SEC Filing on Google Icon
2/9/2026Geode Capital Management LLC2,075,220$3.24M0.0%+11.5%1.901%Search for SEC Filing on Google Icon
2/6/2026Nano Cap New Millennium Growth Fund L P200,000$0.31M0.3%N/A0.183%Search for SEC Filing on Google Icon
2/3/2026Bronte Capital Management Pty Ltd.19,282$30K0.0%N/A0.018%Search for SEC Filing on Google Icon
1/9/2026SG Americas Securities LLC27,002$42K0.0%N/A0.025%Search for SEC Filing on Google Icon
1/1/2026JPMorgan Chase & Co.136,385$0.40M0.0%+199.8%0.125%Search for SEC Filing on Google Icon
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
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: $2.12
Low: $2.11
High: $2.23

50 Day Range

MA: $2.30
Low: $2.00
High: $2.70

52 Week Range

Now: $2.12
Low: $1.09
High: $3.40

Volume

898,474 shs

Average Volume

792,339 shs

Market Capitalization

$235.38 million

P/E Ratio

N/A

Dividend Yield

N/A

Beta

0.64

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

Alector's top insider investors include:
  1. Polaris Venture Management Co (Major Shareholder)
  2. Arnon Rosenthal (CEO)
  3. Sabah Oney (Insider)
  4. Sara Kenkare-Mitra (Insider)
  5. Robert King (Insider)
  6. Neil Lindsay Berkley (CFO)
  7. Marc Grasso (CFO)
  8. Robert Paul (Insider)
  9. Gary Romano (Insider)
  10. Calvin Yu (VP)
Learn More about top insider investors at Alector.

Who are the major institutional investors of Alector?

Alector's top institutional investors include:
  1. Spruce Street Capital LP — 1.89%
  2. Eversept Partners LP — 1.22%
  3. Renaissance Technologies LLC — 1.16%
  4. ADAR1 Capital Management LLC — 0.95%
  5. Affinity Asset Advisors LLC — 0.45%
  6. Bank of America Corp DE — 0.34%
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. Renaissance Technologies LLC
  2. ADAR1 Capital Management LLC
  3. Strs Ohio
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. Grace Wong-Sarad (Insider)
  5. Kristine Yaffe (Director)
  6. Paula Hammond (Director)
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. Spruce Street Capital LP
  2. Affinity Asset Advisors LLC
  3. Eversept Partners LP
  4. Bank of America Corp DE
  5. Dimensional Fund Advisors LP
  6. Sei Investments Co.
  7. Bank of New York Mellon Corp
  8. Diversified Trust Co

Alector Active Insiders

Arnon Rosenthal
Arnon Rosenthal (Age 70)
CEO
1 recent trades
Shehnaaz Suliman
Shehnaaz Suliman
COO
Richard H Scheller
Director
Calvin Yu
Calvin Yu (Age 50)
VP
Robert Paul
Robert Paul (Age 58)
Insider
Robert King
Robert King (Age 63)
Insider