QSI Institutional Ownership & Shareholders
QUANTUM-SI INC (QSI) is currently held by 127 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $47.16M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Vanguard Capital Management Llc is currently the largest disclosed institutional shareholder of QSI tracked by InsiderSet, reporting ownership valued at approximately $6.71M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $9.55M, representing an estimated gain of +42.37% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 77% of the total disclosed QSI value among the investors covered in this analysis. Major shareholders include Vanguard Capital Management Llc, ARK Invest, Blackrock, Inc., and several other long-term asset managers with concentrated positions in QUANTUM-SI INC (QSI).
This page ranks the largest institutional QSI shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
127
Total Reported Value
$47.16M
Largest Holder
Vanguard Capital Management Llc
Largest Position
$6.71M
Insider Transactions (90d)
6
Latest Filing Quarter
Q2 2026
New Institutional Positions
117
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Vanguard Capital Management Llc | 0.00% | 7,578,208 | $6,706,714 | $9,548,542 | +$2,841,828 | +42.37% | |
| ARK Invest | Cathie Wood | 0.04% | 7,167,738 | $6,343,448 | $9,031,350 | +$2,687,902 | +42.37% |
| Blackrock, Inc. | 0.00% | 5,225,352 | $4,624,436 | $6,583,944 | +$1,959,508 | +42.37% | |
| Sumitomo Mitsui Trust Group, Inc. | 0.00% | 3,713,430 | $3,973,370 | $4,678,922 | +$705,552 | +17.76% | |
| Amova Asset Management Americas, Inc. | 0.04% | 3,885,230 | $3,457,855 | $4,895,390 | +$1,437,535 | +41.57% | |
| Millennium Management Llc | 0.00% | 3,131,726 | $2,771,578 | $3,945,975 | +$1,174,397 | +42.37% | |
| Ubs Group Ag | 0.00% | 2,561,897 | $2,267,279 | $3,227,990 | +$960,711 | +42.37% | |
| Aqr Capital Management Llc | 0.00% | 2,348,665 | $2,078,569 | $2,959,318 | +$880,749 | +42.37% | |
| Geode Capital Management, Llc | 0.00% | 2,236,526 | $1,980,439 | $2,818,023 | +$837,584 | +42.29% | |
| Jane Street Group, Llc | 0.00% | 2,142,735 | $1,896,320 | $2,699,846 | +$803,526 | +42.37% | |
| Susquehanna International Group, Llp | 0.00% | 1,116,750 | $988,324 | $1,407,105 | +$418,781 | +42.37% | |
| Vanguard Fiduciary Trust Co | 0.00% | 1,116,683 | $988,264 | $1,407,021 | +$418,757 | +42.37% | |
| State Street Corp | 0.00% | 890,741 | $788,306 | $1,122,334 | +$334,028 | +42.37% | |
| Fosun International Ltd | 0.15% | 743,935 | $658,382 | $937,358 | +$278,976 | +42.37% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 553,871 | $490,176 | $697,877 | +$207,701 | +42.37% |
| Vanguard Portfolio Management Llc | 0.00% | 497,098 | $439,932 | $626,343 | +$186,411 | +42.37% | |
| Goldman Sachs Group Inc | 0.00% | 476,288 | $421,515 | $600,123 | +$178,608 | +42.37% | |
| Northern Trust Corp | 0.00% | 450,531 | $398,720 | $567,669 | +$168,949 | +42.37% | |
| Invesco Ltd. | 0.00% | 443,929 | $392,877 | $559,351 | +$166,474 | +42.37% | |
| Bnp Paribas Financial Markets | 0.00% | 398,598 | $352,759 | $502,233 | +$149,474 | +42.37% | |
| Ieq Capital, Llc | 0.00% | 350,816 | $310,472 | $442,028 | +$131,556 | +42.37% | |
| Aster Capital Management (Difc) Ltd | 0.06% | 344,510 | $304,891 | $434,083 | +$129,192 | +42.37% | |
| Morgan Stanley | 0.00% | 323,482 | $286,282 | $407,587 | +$121,305 | +42.37% | |
| Iq Eq Fund Management (Ireland) Ltd | 0.02% | 321,134 | $284,204 | $404,629 | +$120,425 | +42.37% | |
| Knollwood Investment Advisory, Llc | 0.02% | 300,000 | $265,500 | $378,000 | +$112,500 | +42.37% | |
| Imc-Chicago, Llc | 0.00% | 285,758 | $252,896 | $360,055 | +$107,159 | +42.37% | |
| Bridgeway Capital Management, Llc | 0.00% | 206,100 | $182,399 | $259,686 | +$77,287 | +42.37% | |
| Barclays Plc | 0.00% | 205,690 | $182,035 | $259,169 | +$77,134 | +42.37% | |
| Xtx Topco Ltd | 0.00% | 177,680 | $157,247 | $223,877 | +$66,630 | +42.37% | |
| Simplex Trading, Llc | 0.00% | 165,293 | $146,284 | $208,269 | +$61,985 | +42.37% | |
| Verdence Capital Advisors Llc | 0.01% | 133,305 | $142,636 | $167,964 | +$25,328 | +17.76% | |
| Mariner, Llc | 0.00% | 157,689 | $139,553 | $198,688 | +$59,135 | +42.37% | |
| Shay Capital Llc | 0.01% | 150,922 | $133,566 | $190,162 | +$56,596 | +42.37% | |
| Fmr Llc | 0.00% | 123,767 | $109,534 | $155,946 | +$46,412 | +42.37% | |
| Cwm, Llc | 0.00% | 126,632 | $98,013 | $159,556 | +$61,543 | +62.79% | |
| Group One Trading Llc | 0.00% | 107,473 | $95,114 | $135,416 | +$40,302 | +42.37% | |
| Jones Financial Companies Lllp | 0.00% | 100,483 | $85,812 | $126,609 | +$40,797 | +47.54% | |
| Hrt Financial Lp | 0.00% | 93,647 | $82,000 | $117,995 | +$35,995 | +43.90% | |
| Alphacore Capital Llc | 0.00% | 89,368 | $79,091 | $112,604 | +$33,513 | +42.37% | |
| Cerity Partners Llc | 0.00% | 85,347 | $75,533 | $107,537 | +$32,004 | +42.37% | |
| Vanguard Global Advisers, Llc | 0.00% | 84,757 | $75,010 | $106,794 | +$31,784 | +42.37% | |
| Charles Schwab Investment Management Inc | 0.00% | 84,612 | $74,882 | $106,611 | +$31,729 | +42.37% | |
| Jtc Employer Solutions Trustee Ltd | 0.01% | 77,787 | $69,000 | $98,012 | +$29,012 | +42.05% | |
| Mercer Global Advisors Inc | 0.00% | 77,277 | $68,390 | $97,369 | +$28,979 | +42.37% | |
| Rhumbline Advisers | 0.00% | 75,989 | $67,249 | $95,746 | +$28,497 | +42.38% | |
| Winton Group Ltd | 0.00% | 75,800 | $67,083 | $95,508 | +$28,425 | +42.37% | |
| Captrust Financial Advisors | 0.00% | 73,128 | $64,718 | $92,141 | +$27,423 | +42.37% | |
| Hollencrest Capital Management | 0.00% | 65,011 | $57,535 | $81,914 | +$24,379 | +42.37% | |
| Gsa Capital Partners Llp | 0.00% | 60,011 | $53,000 | $75,614 | +$22,614 | +42.67% | |
| Bank Of America Corp | 0.00% | 59,585 | $52,733 | $75,077 | +$22,344 | +42.37% |
Frequently asked questions about QSI
Who are the largest institutional holders of QSI?
The largest institutional holders of QSI reported in the latest SEC Form 13F filings include Vanguard Capital Management Llc, ARK Invest, Blackrock, Inc., Sumitomo Mitsui Trust Group, Inc., and Amova Asset Management Americas, Inc.. InsiderSet ranks institutional holders by their latest reported QSI position.
What is QSI institutional ownership?
This page tracks QSI positions reported by institutional investment managers through SEC Form 13F. QUANTUM-SI INC (QSI) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own QSI?
InsiderSet currently tracks 127 institutional managers reporting QSI holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of QSI shareholders.
How much QSI stock do institutions own?
Institutional investment managers disclosed approximately $47.16M in QSI holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was QSI institutional ownership last updated?
The latest QSI institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional QSI holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its QSI position after the reporting date.
Are institutions buying or selling QSI?
Institutional buying and selling can be analyzed by comparing QSI positions across consecutive 13F reporting periods. InsiderSet's QSI Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View QSI ownership changes.
How has QSI institutional ownership changed over time?
InsiderSet tracks QSI institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.