NASDAQ: QSI
Quantum Si Inc Stock Ownership - Who owns Quantum Si?

Insider buying vs selling

Have Quantum Si Inc insiders been buying or selling?

Buy
Sell
NameRoleDateSharesPriceValue
Jeffrey Alan HawkinsPresident CEO2025-06-2323,705$1.61
$38.26kSell
Christian LapointeGC Corp. Secretary2025-06-2311,946$1.61
$19.28kSell
John S. VieceliChief Product Officer2025-06-2321,923$1.61
$35.38kSell
Jeffry R. KeyesChief Financial Officer2025-06-238,624$1.61
$13.92kSell
Jeffrey Alan HawkinsPresident CEO2025-03-2123,707$1.39
$32.83kSell
Jeffry R. KeyesChief Financial Officer2025-03-218,626$1.39
$11.95kSell
Christian LapointeGeneral Counsel Corp. Secr.2025-03-214,896$1.39
$6.78kSell
John S. VieceliChief Product Officer2025-03-214,317$1.39
$5.98kSell
Jonathan M. RothbergDirector2024-12-2742,313$4.10
$173.31kSell
Jonathan M. RothbergDirector2024-12-2742,313$4.10
$173.31kSell

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Net Insider Buy/Sell (L12M) Ownership

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QSI Shareholders

What type of owners hold Quantum Si Inc stock?

Institutional
Insider
Retail
NameHoldSharesValueType
Jonathan M. Rothberg23.74%48,067,448$53.84MInsider
4c Holdings I LLC8.86%17,943,750$20.10MInsider
2012 Jmr Trust Common LLC6.16%12,480,108$13.98MInsider
Blackrock Inc5.36%10,848,142$12.15MInstitution
Vanguard Group Inc4.28%8,669,661$9.71MInstitution
James B. Tananbaum4.16%8,424,317$9.44MInsider
Ark Investment Management LLC3.93%7,960,736$8.92MInstitution
Sumitomo Mitsui Trust Group Inc2.78%5,621,303$6.30MInstitution
Nikko Asset Management Americas Inc2.78%5,621,303$6.30MInstitution
Geode Capital Management LLC1.70%3,447,738$3.86MInstitution

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QSI vs Biotech Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
QSI24.59%49.32%Net SellingNet Selling
TVRD2.90%97.10%Net Selling
TLSA0.47%0.00%
MNPR2.62%97.38%Net SellingNet Selling
JBIO20.60%53.98%Net BuyingNet Buying

Quantum Si Stock Ownership FAQ

Who owns Quantum Si?

Quantum Si (NASDAQ: QSI) is owned by 24.59% institutional shareholders, 49.32% Quantum Si insiders, and 26.09% retail investors. Jonathan M. Rothberg is the largest individual Quantum Si shareholder, owning 48.07M shares representing 23.74% of the company. Jonathan M. Rothberg's Quantum Si shares are currently valued at $53.84M.

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