Company · Ownership research

Quantum-Si Inc QSI

CIK 0001816431 · CUSIP 74765K105

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 74765K105 (QSI), not CUSIP 74765K905 (QSI), CUSIP 74765K955 (QSI), and does not merge CUSIPs.

This page lists the top 20 of 43 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	Sumitomo Mitsui Trust Group, Inc. CIK 1475365 · View history	$3.97M 3,713,430 shares	0.00%	-171.80K(-4.40%)Reduced	SEC filing ↗ Oct 29, 2026	▾
02	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$2.28M 2,125,520 shares	0.00%	-111.01K(-5.00%)Reduced	SEC filing ↗ Nov 6, 2026	▾
03	IMC-Chicago, LLC CIK 1452861 · View history	$320.49K 299,521 shares	0.00%	+13.76K(+4.80%)Added	SEC filing ↗ Nov 5, 2026	▾
04	SIMPLEX TRADING, LLC CIK 1488542 · View history	$257.90K 241,028 shares	0.01%	+75.73K(+45.80%)Added	SEC filing ↗ Nov 4, 2026	▾
05	Verdence Capital Advisors LLC CIK 1719305 · View history	$142.64K 133,305 shares	0.01%	-25.00K(-15.80%)Reduced	SEC filing ↗ Oct 26, 2026	▾
06	AlphaCore Capital LLC CIK 1713662 · View history	$95.07K 88,850 shares	0.00%	-518(-0.60%)Reduced	SEC filing ↗ Nov 4, 2026	▾
07	BARCLAYS PLC CIK 312069 · View history	$93.06K 86,974 shares	0.00%	-118.72K(-57.70%)Reduced	SEC filing ↗ Nov 6, 2026	▾
08	Green Alpha Advisors, LLC CIK 1439207 · View history	$50.72K 47,397 shares	0.03%	+1.48K(+3.20%)Added	SEC filing ↗ Oct 8, 2026	▾
09	Cambridge Investment Research Advisors, Inc. CIK 1419186 · View history	$40.00K 37,809 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ Nov 2, 2026	▾
10	SBI Securities Co., Ltd. CIK 1851815 · View history	$38.66K 36,130 shares	0.00%	+3.12K(+9.50%)Added	SEC filing ↗ Oct 22, 2026	▾
11	China Universal Asset Management Co., Ltd. CIK 1906594 · View history	$34.78K 36,300 shares	0.00%	+4.82K(+15.30%)Added	SEC filing ↗ Oct 28, 2026	▾
12	IPG Investment Advisors LLC CIK 1602237 · View history	$33.02K 30,864 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ Oct 30, 2026	▾
13	COMMONWEALTH EQUITY SERVICES, LLC CIK 312272 · View history	$29.19K 27,285 shares	0.00%	+185(+0.70%)Added	SEC filing ↗ Nov 2, 2026	▾
14	LPL Financial LLC CIK 1403438 · View history	$25.66K 23,985 shares	0.00%	+3.00K(+14.30%)Added	SEC filing ↗ Nov 6, 2026	▾
15	DLK Investment Management, LLC CIK 2016793 · View history	$25.39K 23,727 shares	0.01%	+4.73K(+24.90%)Added	SEC filing ↗ Oct 9, 2026	▾
16	Leonteq Securities AG CIK 1535950 · View history	$24.07K 22,500 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ Oct 29, 2026	▾
17	Clear Harbor Asset Management, LLC CIK 1511857 · View history	$21.40K 20,000 shares	0.00%	+20.00KNew	SEC filing ↗ Nov 5, 2026	▾
18	Capital Investment Advisory Services, LLC CIK 1659203 · View history	$21.40K 20,000 shares	0.00%	0(0.00%)Unchanged	SEC filing ↗ Oct 30, 2026	▾
19	HBW ADVISORY SERVICES LLC CIK 1790525 · View history	$21.30K 19,902 shares	0.00%	-2.39K(-10.70%)Reduced	SEC filing ↗ Oct 15, 2026	▾
20	Y-Intercept (Hong Kong) Ltd CIK 1772875 · View history	$19.00K 17,752 shares	0.00%	-61.34K(-77.60%)Reduced	SEC filing ↗ Oct 16, 2026	▾

Showing 20 / 43 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

Cancelled or null records excluded

Disclosed shares

7,160,739

Not deduplicated across managers

Disclosed value

$7.66M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Quantum-Si Inc · Q3 2026

Explore all 43 reporting institutions.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.