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QSI Insider Trading

Insider Ownership Percentage: 30.04%
Insider Buying (Last 12 Months): $564,395.50
Insider Selling (Last 12 Months): $359,827.83

Quantum-Si Insider Trading History Chart

This chart shows the insider buying and selling history at Quantum-Si by year and by quarter.

Skip ChartChart Data in Insider Trading History Table

Quantum-Si Share Price & Price History

Current Price: $0.85
Price Change: ▼ Price Decrease of -0.0162 (-1.88%)
As of 03/20/2026 05:00 PM ET

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

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

Quantum-Si Insider Trading History

Transaction DateInsider NameTitleBuy/SellNumber of SharesAverage Share PriceTotal TransactionShares Held After TransactionDetails
3/5/2026Charles R KummethDirectorBuy500,000$0.92$460,000.00855,000View SEC Filing Icon  
3/5/2026Paula DowdyDirectorBuy109,890$0.95$104,395.50269,107View SEC Filing Icon  
12/22/2025Jeffrey Alan HawkinsCEOSell23,707$1.28$30,344.962,578,018View SEC Filing Icon  
12/22/2025Jeffry R KeyesCFOSell8,627$1.28$11,042.561,163,197View SEC Filing Icon  
12/22/2025John S. VieceliInsiderSell21,927$1.28$28,066.56800,973View SEC Filing Icon  
10/16/2025Jonathan M RothbergDirectorSell26,095$3.07$80,111.651,904,866View SEC Filing Icon  
9/22/2025Jeffrey Alan HawkinsCEOSell10,643$1.68$17,880.242,612,368View SEC Filing Icon  
9/22/2025Jeffry R KeyesCFOSell3,873$1.68$6,506.641,175,697View SEC Filing Icon  
9/22/2025John S. VieceliInsiderSell9,843$1.68$16,536.24832,743View SEC Filing Icon  
9/22/2025Todd C BennettInsiderSell18,482$1.68$31,049.76700,003View SEC Filing Icon  
6/23/2025Jeffrey Alan HawkinsCEOSell23,705$1.61$38,165.052,623,011View SEC Filing Icon  
6/23/2025Jeffry R KeyesCFOSell8,624$1.61$13,884.641,179,570View SEC Filing Icon  
6/23/2025John S. VieceliInsiderSell21,923$1.61$35,296.03842,586View SEC Filing Icon  
3/21/2025Jeffrey Alan HawkinsCEOSell23,707$1.39$32,952.732,646,716View SEC Filing Icon  
3/21/2025Jeffry R KeyesCFOSell8,626$1.39$11,990.141,188,194View SEC Filing Icon  
3/21/2025John S. VieceliInsiderSell4,317$1.39$6,000.63864,509View SEC Filing Icon  
12/27/2024Jonathan M RothbergDirectorSell3,506,267$3.34$11,710,931.781,250,000View SEC Filing Icon  
12/23/2024John S. VieceliInsiderSell4,306$1.29$5,554.74160,493View SEC Filing Icon  
9/23/2024John S. VieceliInsiderSell2,192$0.95$2,082.40166,916View SEC Filing Icon  
8/12/2024Charles R KummethDirectorBuy31,100$0.89$27,679.00355,000View SEC Filing Icon  
8/9/2024Charles R KummethDirectorBuy138,900$0.87$120,843.00323,900View SEC Filing Icon  
8/9/2024Christian LaPointeGeneral CounselBuy25,000$0.86$21,500.00571,710View SEC Filing Icon  
8/9/2024Jeffry R KeyesCFOBuy50,000$0.87$43,500.00446,820View SEC Filing Icon  
6/24/2024Grace JohnstonInsiderSell3,169$1.20$3,802.80295,940View SEC Filing Icon  
6/21/2024Grace JohnstonInsiderSell4,359$1.21$5,274.39299,109View SEC Filing Icon  
3/15/2024Christian LaPointeGeneral CounselBuy10,000$1.74$17,400.00257,693View SEC Filing Icon  
3/14/2024Jeffrey Alan HawkinsCEOBuy25,000$1.76$44,000.0025,000View SEC Filing Icon  
3/5/2024Jeffry R KeyesCFOBuy50,000$1.61$80,500.0050,000View SEC Filing Icon  
See Full Table

SEC Filings (Institutional Ownership Changes) for Quantum-Si (NASDAQ:QSI)

39.90% of Quantum-Si 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 QSI by year and by quarter.

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

Quantum-Si Institutional Trading History

Reporting DateHedge FundShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
3/3/2026Caitong International Asset Management Co. Ltd37,964$42K0.0%-36.5%0.018%Search for SEC Filing on Google Icon
2/23/2026Virtu Financial LLC238,379$0.26M0.0%N/A0.111%Search for SEC Filing on Google Icon
2/19/2026Invesco Ltd.402,821$0.44M0.0%+36.2%0.187%Search for SEC Filing on Google Icon
2/18/2026XTX Topco Ltd461,982$0.51M0.0%+206.9%0.214%Search for SEC Filing on Google Icon
2/18/2026Quadrature Capital Ltd276,889$0.31M0.0%N/A0.128%Search for SEC Filing on Google Icon
2/18/2026Millennium Management LLC191,791$0.21M0.0%-92.8%0.089%Search for SEC Filing on Google Icon
2/16/2026Barclays PLC269,415$0.30M0.0%+21.8%0.125%Search for SEC Filing on Google Icon
2/13/2026State Street Corp3,562,721$3.92M0.0%+26.5%1.653%Search for SEC Filing on Google Icon
2/13/2026Caitong International Asset Management Co. Ltd25,194$28K0.1%-57.9%0.012%Search for SEC Filing on Google Icon
2/13/2026Wells Fargo & Company MN176,132$0.19M0.0%+29.6%0.082%Search for SEC Filing on Google Icon
2/12/2026HRT Financial LP104,292$0.11M0.0%N/A0.048%Search for SEC Filing on Google Icon
2/12/2026MetLife Investment Management LLC34,222$38K0.0%-47.0%0.016%Search for SEC Filing on Google Icon
2/12/2026State Board of Administration of Florida Retirement System41,282$45K0.0%N/A0.019%Search for SEC Filing on Google Icon
2/12/2026Dimensional Fund Advisors LP31,320$34K0.0%N/A0.015%Search for SEC Filing on Google Icon
2/12/2026IQ EQ FUND MANAGEMENT IRELAND Ltd253,895$0.28M0.0%+34.2%0.118%Search for SEC Filing on Google Icon
2/11/2026ARK Investment Management LLC7,021,571$7.72M0.1%-7.9%3.258%Search for SEC Filing on Google Icon
2/11/2026Amova Asset Management Americas Inc.4,690,720$5.11M0.1%-10.1%2.177%Search for SEC Filing on Google Icon
2/11/2026Los Angeles Capital Management LLC93,010$0.10M0.0%N/A0.043%Search for SEC Filing on Google Icon
2/9/2026Geode Capital Management LLC4,114,375$4.53M0.0%+9.8%1.909%Search for SEC Filing on Google Icon
2/6/2026Leonteq Securities AG25,000$28K0.0%N/A0.012%Search for SEC Filing on Google Icon
1/29/2026Verdence Capital Advisors LLC187,805$0.21M0.0%+14.6%0.087%Search for SEC Filing on Google Icon
1/29/2026China Universal Asset Management Co. Ltd.31,865$35K0.0%N/A0.015%Search for SEC Filing on Google Icon
1/23/2026Curbstone Financial Management Corp24,000$26K0.0%N/A0.011%Search for SEC Filing on Google Icon
1/23/2026Sumitomo Mitsui Trust Group Inc.4,690,720$5.16M0.0%-10.1%2.177%Search for SEC Filing on Google Icon
1/9/2026SG Americas Securities LLC29,106$32K0.0%-30.9%0.014%Search for SEC Filing on Google Icon
1/7/2026Green Alpha Advisors LLC51,528$57K0.1%-76.1%0.024%Search for SEC Filing on Google Icon
11/19/2025Caitong International Asset Management Co. Ltd59,774$84K0.1%N/A0.028%Search for SEC Filing on Google Icon
11/17/2025Millennium Management LLC2,669,959$3.77M0.0%-29.4%1.239%Search for SEC Filing on Google Icon
11/17/2025Bank of America Corp DE348,007$0.49M0.0%-25.3%0.161%Search for SEC Filing on Google Icon
11/14/2025Shay Capital LLC154,572$0.22M0.0%+19.2%0.076%Search for SEC Filing on Google Icon
11/14/2025Two Sigma Investments LP515,852$0.73M0.0%-8.6%0.255%Search for SEC Filing on Google Icon
11/14/2025Bridgeway Capital Management LLC261,100$0.37M0.0%+33.1%0.129%Search for SEC Filing on Google Icon
11/14/2025Squarepoint Ops LLC613,475$0.87M0.0%N/A0.303%Search for SEC Filing on Google Icon
11/13/2025UBS Group AG504,859$0.71M0.0%-36.1%0.249%Search for SEC Filing on Google Icon
11/13/2025BNP Paribas Financial Markets30,464$43K0.0%+101.3%0.015%Search for SEC Filing on Google Icon
11/12/2025Amova Asset Management Americas Inc.5,217,499$7.36M0.1%-7.2%2.577%Search for SEC Filing on Google Icon
11/12/2025ARK Investment Management LLC7,624,042$10.75M0.1%-4.2%3.765%Search for SEC Filing on Google Icon
11/12/2025Intech Investment Management LLC74,761$0.11M0.0%-15.5%0.037%Search for SEC Filing on Google Icon
11/7/2025Vanguard Group Inc.8,714,507$12.29M0.0%+0.5%4.304%Search for SEC Filing on Google Icon
11/6/2025Rhumbline Advisers219,965$0.31M0.0%+7.8%0.109%Search for SEC Filing on Google Icon
11/5/2025IQ EQ FUND MANAGEMENT IRELAND Ltd189,174$0.27M0.0%+61.9%0.093%Search for SEC Filing on Google Icon
11/5/2025Capital Investment Advisory Services LLC20,000$28K0.0%+100.0%0.010%Search for SEC Filing on Google Icon
11/5/2025SBI Securities Co. Ltd.33,616$47K0.0%+28.6%0.017%Search for SEC Filing on Google Icon
11/4/2025Jones Financial Companies Lllp93,500$0.14M0.0%+99.4%0.046%Search for SEC Filing on Google Icon
11/3/2025Hollencrest Capital Management35,000$49K0.0%+40.0%0.017%Search for SEC Filing on Google Icon
10/29/2025Verdence Capital Advisors LLC163,830$0.23M0.0%N/A0.081%Search for SEC Filing on Google Icon
10/27/2025Sumitomo Mitsui Trust Group Inc.5,217,499$7.36M0.0%-7.2%2.577%Search for SEC Filing on Google Icon
10/23/2025SG Americas Securities LLC42,107$59K0.0%+30.8%0.021%Search for SEC Filing on Google Icon
10/23/2025JTC Employer Solutions Trustee Ltd34,540$49K0.0%+158.9%0.017%Search for SEC Filing on Google Icon
10/21/2025Wealth Management Associates Inc.30,950$44K0.0%+14.8%0.015%Search for SEC Filing on Google Icon
10/16/2025Elite Life Management LLC20,611$29K0.1%N/A0.010%Search for SEC Filing on Google Icon
10/16/2025HBK Sorce Advisory LLC21,428$30K0.0%N/A0.011%Search for SEC Filing on Google Icon
10/15/2025Green Alpha Advisors LLC216,032$0.31M0.3%-5.4%0.107%Search for SEC Filing on Google Icon
10/14/2025HBK Sorce Advisory LLC21,428$30K0.0%N/A0.011%Search for SEC Filing on Google Icon
10/9/2025Voya Investment Management LLC27,246$38K0.0%-29.9%0.013%Search for SEC Filing on Google Icon
8/16/2025Nikko Asset Management Americas Inc.5,621,303$11.02M0.1%-3.3%3.063%Search for SEC Filing on Google Icon
8/15/2025Bank of America Corp DE465,999$0.91M0.0%+426.6%0.254%Search for SEC Filing on Google Icon
8/15/2025Ameriprise Financial Inc.223,100$0.44M0.0%N/A0.122%Search for SEC Filing on Google Icon
8/14/2025The Manufacturers Life Insurance Company 49,082$96K0.0%+27.4%0.027%Search for SEC Filing on Google Icon
8/14/2025Cerity Partners LLC14,881$29K0.0%N/A0.008%Search for SEC Filing on Google Icon
8/13/2025Invesco Ltd.195,450$0.38M0.0%+88.6%0.107%Search for SEC Filing on Google Icon
8/12/2025XTX Topco Ltd46,474$91K0.0%-87.4%0.025%Search for SEC Filing on Google Icon
8/12/2025Jefferies Financial Group Inc.20,000$39K0.0%-71.7%0.011%Search for SEC Filing on Google Icon
8/12/2025Prudential Financial Inc.12,850$25K0.0%N/A0.007%Search for SEC Filing on Google Icon
8/12/2025Rhumbline Advisers203,967$0.40M0.0%+36.0%0.111%Search for SEC Filing on Google Icon
8/12/2025JPMorgan Chase & Co.66,656$0.13M0.0%+15.6%0.036%Search for SEC Filing on Google Icon
8/8/2025Kingsview Wealth Management LLC20,012$39K0.0%+99.9%0.011%Search for SEC Filing on Google Icon
8/8/2025Intech Investment Management LLC88,497$0.17M0.0%+44.2%0.048%Search for SEC Filing on Google Icon
8/8/2025Geode Capital Management LLC3,447,738$6.76M0.0%+15.1%1.879%Search for SEC Filing on Google Icon
8/4/2025Wolverine Asset Management LLC16,501$32K0.0%+140.0%0.009%Search for SEC Filing on Google Icon
8/1/2025IQ EQ FUND MANAGEMENT IRELAND Ltd116,828$0.23M0.0%+67.0%0.064%Search for SEC Filing on Google Icon
8/1/2025Green Alpha Advisors LLC228,348$0.45M0.4%-6.4%0.124%Search for SEC Filing on Google Icon
7/31/2025Sumitomo Mitsui Trust Group Inc.5,621,303$11.02M0.0%-3.3%3.063%Search for SEC Filing on Google Icon
7/30/2025ARK Investment Management LLC7,960,736$15.60M0.1%-8.6%4.338%Search for SEC Filing on Google Icon
7/29/2025JTC Employer Solutions Trustee Ltd13,340$26K0.0%N/A0.007%Search for SEC Filing on Google Icon
7/18/2025EWA LLC68,200$0.13M0.0%-13.3%0.037%Search for SEC Filing on Google Icon
6/27/2025Goldman Sachs Group Inc.441,314$0.53M0.0%-56.0%0.240%Search for SEC Filing on Google Icon
5/28/2025Wealth Management Associates Inc.26,950$32K0.0%-23.1%0.015%Search for SEC Filing on Google Icon
5/16/2025Goldman Sachs Group Inc.441,314$0.53M0.0%-56.0%0.241%Search for SEC Filing on Google Icon
5/16/2025Millennium Management LLC3,934,285$4.72M0.0%N/A2.148%Search for SEC Filing on Google Icon
5/16/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.70,552$85K0.0%+23.8%0.039%Search for SEC Filing on Google Icon
5/14/2025Corebridge Financial Inc.58,876$71K0.0%+18.2%0.032%Search for SEC Filing on Google Icon
5/14/2025MetLife Investment Management LLC76,015$91K0.0%N/A0.042%Search for SEC Filing on Google Icon
5/13/2025Russell Investments Group Ltd.38,257$46K0.0%+322.6%0.021%Search for SEC Filing on Google Icon
5/12/2025Nuveen LLC319,100$0.38M0.0%N/A0.174%Search for SEC Filing on Google Icon
5/12/2025Virtu Financial LLC34,830$42K0.0%N/A0.019%Search for SEC Filing on Google Icon
5/12/2025Invesco Ltd.103,657$0.12M0.0%+177.7%0.057%Search for SEC Filing on Google Icon
5/9/2025Deutsche Bank AG67,522$81K0.0%+107.4%0.037%Search for SEC Filing on Google Icon
5/9/2025Charles Schwab Investment Management Inc.367,444$0.44M0.0%+19.3%0.201%Search for SEC Filing on Google Icon
5/9/2025IQ EQ FUND MANAGEMENT IRELAND Ltd69,944$84K0.0%+106.3%0.038%Search for SEC Filing on Google Icon
5/8/2025XTX Topco Ltd368,968$0.44M0.0%+50.2%0.201%Search for SEC Filing on Google Icon
5/7/2025ARK Investment Management LLC8,713,501$10.46M0.1%-1.5%4.758%Search for SEC Filing on Google Icon
5/7/2025Nikko Asset Management Americas Inc.5,811,430$6.92M0.1%-2.6%3.173%Search for SEC Filing on Google Icon
4/29/2025Bank of New York Mellon Corp294,906$0.35M0.0%+9.3%0.161%Search for SEC Filing on Google Icon
4/25/2025Sumitomo Mitsui Trust Group Inc.5,811,430$6.97M0.0%-2.6%3.173%Search for SEC Filing on Google Icon
4/22/2025EWA LLC78,688$94K0.0%N/A0.043%Search for SEC Filing on Google Icon
4/21/2025WestHill Financial Advisors Inc.21,727$26K0.0%N/A0.012%Search for SEC Filing on Google Icon
4/9/2025HBW Advisory Services LLC24,243$29K0.0%N/A0.013%Search for SEC Filing on Google Icon
4/9/2025Green Alpha Advisors LLC244,067$0.29M0.3%+53.6%0.133%Search for SEC Filing on Google Icon
3/17/2025Wealth Enhancement Advisory Services LLC13,384$36K0.0%N/A0.007%Search for SEC Filing on Google Icon
Data available starting January 2016

See Full Table
Quantum-Si logo
Quantum-Si incorporated, a life sciences company, engages in the development of single-molecule detection platform to enable Next Generation Protein Sequencing (NGPS). The company's platform is comprised of the Platinum NGPS instrument; the Platinum Analysis Software service; and reagent kits and semiconductor chips for use with its instruments. It is used in protein identification, protein variants, antibody characterization, biomarker identification, and post translational modification analysis applications. The company was founded in 2013 is headquartered in Branford, Connecticut.
Read More on Quantum-Si

Today's Range

Now: $0.85
Low: $0.83
High: $0.88

50 Day Range

MA: $1.05
Low: $0.85
High: $1.31

52 Week Range

Now: $0.85
Low: $0.83
High: $3.10

Volume

3,803,483 shs

Average Volume

3,291,351 shs

Market Capitalization

$182.85 million

P/E Ratio

N/A

Dividend Yield

N/A

Beta

3

Who are the company insiders with the largest holdings of Quantum-Si?

Quantum-Si's top insider investors include:
  1. Jeffrey Alan Hawkins (CEO)
  2. Jonathan M Rothberg (Director)
  3. Jeffry R Keyes (CFO)
  4. John S Vieceli (Insider)
  5. Charles R Kummeth (Director)
  6. Todd C Bennett (Insider)
  7. Christian Lapointe (General Counsel)
  8. Grace Johnston (Insider)
  9. Paula Dowdy (Director)
Learn More about top insider investors at Quantum-Si.

Who are the major institutional investors of Quantum-Si?

Quantum-Si's top institutional investors include:
  1. ARK Investment Management LLC — 3.26%
  2. Sumitomo Mitsui Trust Group Inc. — 2.18%
  3. Amova Asset Management Americas Inc. — 2.18%
  4. Geode Capital Management LLC — 1.91%
  5. State Street Corp — 1.65%
  6. XTX Topco Ltd — 0.21%
Learn More about top institutional investors of Quantum-Si stock.

Which major investors are selling Quantum-Si stock?

In the last quarter, QSI stock was sold by these institutional investors:
  1. Millennium Management LLC
  2. ARK Investment Management LLC
  3. Sumitomo Mitsui Trust Group Inc.
  4. Amova Asset Management Americas Inc.
  5. IMC Chicago LLC
  6. Green Alpha Advisors LLC
  7. Caitong International Asset Management Co. Ltd
  8. MetLife Investment Management LLC
In the last year, company insiders that have sold Quantum-Si company stock include:
  1. Jeffrey Alan Hawkins (CEO)
  2. Jonathan M Rothberg (Director)
  3. Jeffry R Keyes (CFO)
  4. John S Vieceli (Insider)
  5. Charles R Kummeth (Director)
Learn More investors selling Quantum-Si stock.

Which major investors are buying Quantum-Si stock?

During the previous quarter, QSI stock was acquired by institutional investors including:
  1. State Street Corp
  2. Geode Capital Management LLC
  3. XTX Topco Ltd
  4. Quadrature Capital Ltd
  5. Virtu Financial LLC
  6. Invesco Ltd.
  7. HRT Financial LP
  8. Los Angeles Capital Management LLC
During the previous year, these company insiders have bought Quantum-Si stock:
  1. Jeffrey Alan Hawkins (CEO)
  2. Jonathan M Rothberg (Director)
  3. Jeffry R Keyes (CFO)
  4. John S Vieceli (Insider)
Learn More investors buying Quantum-Si stock.