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Quantum-Si incorporated (QSI) institutional ownership

Latest close $0.71 Jul 31, 2026
Market cap$208M 52-week range SectorHealthcare
Funds holding · Q1 2026
135
reported QSI position changes
Top owners · Q2 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Activity unavailable N/A
79 buyers · 56 sellers

Quantum-Si incorporated (QSI) price and institutional activity

Dates

Q1 2026

$0 bought by 79 investors
AQR Capital Management LLCBlackRock +77 more
$0 sold by 56 investors
Citadel Advisors LLCTwo Sigma Investments, LP +54 more
Bought Sold Totals per quarter; hover a bar for the names.

Quantum-Si incorporated (QSI) institutional activity · 79

Investor Type Est. change Change Δ Own Date
AQR Capital Management LLC · Added
Change +2.3M Date Q1 2026
AQR Capital Management LLC Added· Q1 2026 +2.3M Q1 2026
BlackRock · Added
Change +361K Date Q1 2026
BlackRock Added· Q1 2026 +361K Q1 2026
Ieq Capital, LLC · New
Change +358K Date Q1 2026
Ieq Capital, LLC New· Q1 2026 +358K Q1 2026
UBS Group AG · Added
Change +253K Date Q1 2026
UBS Group AG Added· Q1 2026 +253K Q1 2026
Imc-Chicago, LLC · New
Change +221K Date Q1 2026
Imc-Chicago, LLC New· Q1 2026 +221K Q1 2026
State Street · Added
Change +208K Date Q1 2026
State Street Added· Q1 2026 +208K Q1 2026
CIBC Bancorp USA Inc. · Added
Change +192K Date Q1 2026
CIBC Bancorp USA Inc. Added· Q1 2026 +192K Q1 2026
Mariner, LLC · Added
Change +143K Date Q1 2026
Mariner, LLC Added· Q1 2026 +143K Q1 2026
Vanguard · Added
Change +138K Date Q1 2026
Vanguard Added· Q1 2026 +138K Q1 2026
Cwm, LLC · Added
Change +120K Date Q1 2026
Cwm, LLC Added· Q1 2026 +120K Q1 2026
Renaissance Technologies LLC New· Q1 2026 +118K Q1 2026
Wealth Enhancement Advisory Services, LLC · New
Change +90K Date Q1 2026
Wealth Enhancement Advisory Services, LLC New· Q1 2026 +90K Q1 2026
Cerity Partners LLC · New
Change +81K Date Q1 2026
Cerity Partners LLC New· Q1 2026 +81K Q1 2026
Alphacore Capital LLC · Added
Change +79K Date Q1 2026
Alphacore Capital LLC Added· Q1 2026 +79K Q1 2026
Metlife Investment Management, LLC · Added
Change +67K Date Q1 2026
Metlife Investment Management, LLC Added· Q1 2026 +67K Q1 2026
Data through Q1 2026 · filed Jun 3, 2026
15 of 79

Famous investor activity in Quantum-Si incorporated (QSI)

Quantum-Si incorporated (QSI) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
Lapointe Christian · Officer Sell −$7K
Price $0.90 Qty −8K Owned 1.2M ΔOwn −0.7% Trade date Jun 23, 2026 Filed date Jun 24, 2026
Lapointe Christian Officer Sell $0.90 −8K −$7K 1.2M −0.7% Jun 23, 2026 Jun 24, 2026
Keyes Jeffry R. · Officer Sell −$4K
Price $0.90 Qty −4K Owned 1.7M ΔOwn −0.2% Trade date Jun 23, 2026 Filed date Jun 24, 2026
Keyes Jeffry R. Officer Sell $0.90 −4K −$4K 1.7M −0.2% Jun 23, 2026 Jun 24, 2026
Vieceli John S. · Officer Sell −$14K
Price $0.90 Qty −15K Owned 1.1M ΔOwn −1.3% Trade date Jun 23, 2026 Filed date Jun 24, 2026
Vieceli John S. Officer Sell $0.90 −15K −$14K 1.1M −1.3% Jun 23, 2026 Jun 24, 2026
Hawkins Jeffrey Alan · Director Sell −$10K
Price $0.90 Qty −11K Owned 3.7M ΔOwn −0.3% Trade date Jun 23, 2026 Filed date Jun 24, 2026
Hawkins Jeffrey Alan Director Sell $0.90 −11K −$10K 3.7M −0.3% Jun 23, 2026 Jun 24, 2026
Lapointe Christian · Officer Sell −$7K
Price $0.96 Qty −8K Owned 1.2M ΔOwn −0.7% Trade date Jun 22, 2026 Filed date Jun 24, 2026
Lapointe Christian Officer Sell $0.96 −8K −$7K 1.2M −0.7% Jun 22, 2026 Jun 24, 2026
Keyes Jeffry R. · Officer Sell −$4K
Price $0.96 Qty −4K Owned 1.7M ΔOwn −0.2% Trade date Jun 22, 2026 Filed date Jun 24, 2026
Keyes Jeffry R. Officer Sell $0.96 −4K −$4K 1.7M −0.2% Jun 22, 2026 Jun 24, 2026
Vieceli John S. · Officer Sell −$14K
Price $0.96 Qty −15K Owned 1.2M ΔOwn −1.3% Trade date Jun 22, 2026 Filed date Jun 24, 2026
Vieceli John S. Officer Sell $0.96 −15K −$14K 1.2M −1.3% Jun 22, 2026 Jun 24, 2026
Hawkins Jeffrey Alan · Director Sell −$11K
Price $0.96 Qty −11K Owned 3.7M ΔOwn −0.3% Trade date Jun 22, 2026 Filed date Jun 24, 2026
Hawkins Jeffrey Alan Director Sell $0.96 −11K −$11K 3.7M −0.3% Jun 22, 2026 Jun 24, 2026
Makes Brigid · Director Grant (A) 251K
Owned 251K Trade date May 18, 2026 Filed date May 20, 2026
Makes Brigid Director Grant (A) 251K 251K May 18, 2026 May 20, 2026
Fattori Ruth A. · Director Grant (A) 251K
Owned 251K Trade date May 18, 2026 Filed date May 20, 2026
Fattori Ruth A. Director Grant (A) 251K 251K May 18, 2026 May 20, 2026
Dowdy Paula · Director Grant (A) 251K
Owned 251K Trade date May 18, 2026 Filed date May 20, 2026
Dowdy Paula Director Grant (A) 251K 251K May 18, 2026 May 20, 2026
Jafri Amir · Director Grant (A) 251K
Owned 251K Trade date May 18, 2026 Filed date May 20, 2026
Jafri Amir Director Grant (A) 251K 251K May 18, 2026 May 20, 2026
Kenny John P. · Director Grant (A) 251K
Owned 251K Trade date May 18, 2026 Filed date May 20, 2026
Kenny John P. Director Grant (A) 251K 251K May 18, 2026 May 20, 2026
Rakin Kevin · Director Grant (A) 251K
Owned 251K Trade date May 18, 2026 Filed date May 20, 2026
Rakin Kevin Director Grant (A) 251K 251K May 18, 2026 May 20, 2026
Mendel Scott · Director Grant (A) 251K
Owned 251K Trade date May 18, 2026 Filed date May 20, 2026
Mendel Scott Director Grant (A) 251K 251K May 18, 2026 May 20, 2026
15 of 51
15 of 51 Sign in to continue to older insider transactions.

Quantum-Si incorporated (QSI) activist and large shareholders

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
Rothberg Jonathan M 15.7M
% of shares outstanding 13.5% Filing date Jun 21, 2021
Rothberg Jonathan M 15.7M 13.5% Jun 21, 2021
BlackRock Inc. 7.4M
% of shares outstanding 6.1% Filing date Jan 29, 2024
BlackRock Inc. 7.4M 6.1% Jan 29, 2024
Glenview Capital Management, LLC 6.0M
% of shares outstanding 5.1% Filing date Feb 14, 2022
Glenview Capital Management, LLC 6.0M 5.1% Feb 14, 2022
Nikko Asset Management Americas, Inc. 6.0M
% of shares outstanding 4.8% Filing date Feb 13, 2025
Nikko Asset Management Americas, Inc. 6.0M 4.8% Feb 13, 2025
Sumitomo Mitsui Trust Group, Inc. 6.0M
% of shares outstanding 4.8% Filing date Feb 4, 2025
Sumitomo Mitsui Trust Group, Inc. 6.0M 4.8% Feb 4, 2025
The Vanguard Group 8.7M
% of shares outstanding 4.8% Filing date Oct 30, 2025
The Vanguard Group 8.7M 4.8% Oct 30, 2025
Ark Investment Management LLC 7.8M
% of shares outstanding 4.8% Filing date Jun 6, 2025
Ark Investment Management LLC 7.8M 4.8% Jun 6, 2025
Blackrock, Inc. 4.6M
% of shares outstanding 2.3% Filing date Jul 29, 2026
Blackrock, Inc. 4.6M 2.3% Jul 29, 2026
8 of 13

Quantum-Si incorporated (QSI) ownership FAQ

Who owns QSI?

135 reporting institutions disclosed QSI position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.