QUANTUM SI INC

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QSI·74765K105·US·Common Stock·Healthcare - Medical Devices-Activist

QSI (QUANTUM SI INC) is held by 71 institutional investors as of Q2 2026. Largest holders: VANGUARD CAPITAL MANAGEMENT LLC ($6.7M), ARK Investment Management LLC ($6.3M), BlackRock, Inc. ($4.6M). Net institutional sentiment: Bearish.

71

Holders

(6 Elite)

$43.7M

Total Value

30% (93)

Consensus

28 buying - 65 selling

13F: Jun 30, 2026Insider & Congress: Updated regularly

Smart Money Verdict

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Institutional (13F)32

Insider (Form 4)33

Activist (13D/13G)63

Congressional (STOCK Act)34

Holder Quality

18

★★★★★

Elite

60

★★★★

Strong

26

★★★

Solid

64

★★

Below

77

★

Weak

Held by 71 funds

6 elite

Who's Trading

Source dates: Price Oct 9, 2026 · Insiders Sep 23, 2026 · Activists Aug 28, 2026 · Congress none

InsiderHAHawkins Jeffrey AlanSell $7KSep 22, 2026

InsiderKRKeyes Jeffry R.Sell $2KSep 22, 2026

InsiderLCLaPointe ChristianSell $4KSep 22, 2026

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Top Holders

Top Holders (71)History

AllNewIncreasedHeldDecreasedExitedFirst report

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Fund	Action	Shares	Value	Weight	Est. P&L	Conviction
VAVANGUARD CAPITAL MANAGEMENT LLC	Increased	7.6M(+7.9%)	$6.7M	0.0%	+61.87%	29
ARK Investment Management LLC	Increased	7.2M(+4.2%)	$6.3M	0.0%	-78.72%	28
BlackRock, Inc.	Decreased	5.2M(-61.0%)	$4.6M	0.0%	-41.42%	0
Amova Asset Management Americas, Inc.	Decreased	3.9M(-11.5%)	$3.5M	0.0%	-49.36%	0
Sumitomo Mitsui Trust Group, Inc.	Decreased	3.9M(-11.5%)	$3.4M	0.0%	-13.16%	0
MILLENNIUM MANAGEMENT LLC	New	3.1M	$2.8M	0.0%	+72.88%	36
UBS Group AG	Increased	2.6M(+50.5%)	$2.3M	0.0%	+14.95%	36
AQR CAPITAL MANAGEMENT LLC	Decreased	2.3M(-1.8%)	$2.1M	0.0%	+52.01%	0
GEODE CAPITAL MANAGEMENT, LLC	Decreased	2.2M(-41.7%)	$2M	0.0%	-50.03%	0
JANE STREET GROUP, LLC	New	2.1M	$1.9M	0.0%	+72.88%	36
SUSQUEHANNA INTERNATIONAL GROUP, LLP	Decreased	1.1M(-23.8%)	$988,324	0.0%	-25.07%	0
VFVANGUARD FIDUCIARY TRUST CO	Decreased	1.1M(-0.1%)	$988,264	0.0%	+61.05%	0
STATE STREET CORP	Decreased	890,741(-76.4%)	$788,306	0.0%	-12.33%	0
RENAISSANCE TECHNOLOGIES LLC	Increased	553,871(+369.8%)	$490,176	0.0%	+70.23%	39
VPVANGUARD PORTFOLIO MANAGEMENT LLC	Decreased	497,098(-67.3%)	$439,932	0.0%	+61.05%	0
GOLDMAN SACHS GROUP INC	Increased	476,288(+7.2%)	$421,515	0.0%	-33.79%	17
NORTHERN TRUST CORP	Decreased	450,531(-64.3%)	$398,720	0.0%	-36.70%	0
Invesco Ltd.	Increased	443,929(+9.2%)	$392,877	0.0%	+7.39%	18
BNP PARIBAS FINANCIAL MARKETS	Increased	398,598(+938.3%)	$352,759	0.0%	+56.39%	38
IEQ CAPITAL, LLC	Decreased	350,816(-1.9%)	$310,472	0.0%	+61.05%	0

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High Conviction Moves-Smart Money Convergence-Fund Consensus-Double-Down Detection

Data sourced from four public-disclosure sources: SEC 13F, Form 4, 13D/13G, and House/Senate STOCK Act disclosures. Not financial advice. Full disclaimer