QUANTUM SI INC

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

QSI (QUANTUM SI INC) is held by 88 institutional investors as of Q1 2026. Largest holders: BlackRock, Inc. ($10.4M), VANGUARD CAPITAL MANAGEMENT LLC ($5.4M), ARK Investment Management LLC ($5.3M). Net institutional sentiment: Mixed.

88

Holders

(7 Elite)

$46.5M

Total Value

56% (84)

Consensus

47 buying - 37 selling

13F: Mar 31, 2026Insider & Congress: Updated regularly

Smart Money Verdict

View all

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 88 funds

7 elite

Who's Trading

Source dates: Price Aug 13, 2026 · Insiders Apr 22, 2026 · Activists Jul 29, 2026 · Congress none

ActivistBlackRock, Inc.2.3%Jul 29, 2026

InsiderHAHawkins Jeffrey AlanSell $83KApr 21, 2026

InsiderKRKeyes Jeffry R.Sell $37KApr 21, 2026

InsiderHAHawkins Jeffrey AlanSell $84KApr 20, 2026

InsiderKRKeyes Jeffry R.Sell $38KApr 20, 2026

InsiderLCLaPointe ChristianSell $5KMar 23, 2026

InsiderVSVieceli John S.Sell $9KMar 23, 2026

InsiderKRKeyes Jeffry R.Sell $4KMar 23, 2026

InsiderHAHawkins Jeffrey AlanSell $10KMar 23, 2026

ActivistThe Vanguard Group4.8%Oct 30, 2025

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Top Holders

Top Holders (88)History

AllNewIncreasedHeldDecreasedExited

Fund	Action	Shares	Value	Weight	Est. P&L	Conviction
BlackRock, Inc.	Increased	13.4M(+2.8%)	$10.4M	0.0%	-69.75%	28
VAVANGUARD CAPITAL MANAGEMENT LLC	New	7M	$5.4M	0.0%	-16.84%	37
ARK Investment Management LLC	Decreased	6.9M(-2.0%)	$5.3M	0.0%	-89.40%	0
Amova Asset Management Americas, Inc.	Decreased	4.4M(-6.4%)	$3.4M	0.0%	-73.85%	0
Sumitomo Mitsui Trust Group, Inc.	Decreased	4.4M(-6.4%)	$3.4M	0.0%	-55.16%	0
GEODE CAPITAL MANAGEMENT, LLC	Decreased	3.8M(-6.8%)	$3M	0.0%	-74.20%	0
STATE STREET CORP	Increased	3.8M(+5.8%)	$2.9M	0.0%	-54.73%	28
AQR CAPITAL MANAGEMENT LLC	Increased	2.4M(+2659.5%)	$1.9M	0.0%	-21.51%	42
UBS Group AG	Increased	1.7M(+17.5%)	$1.3M	0.0%	-49.23%	30
VPVANGUARD PORTFOLIO MANAGEMENT LLC	New	1.5M	$1.2M	0.0%	-16.84%	35
SUSQUEHANNA INTERNATIONAL GROUP, LLP	Decreased	1.5M(-37.1%)	$1.1M	0.0%	-61.28%	0
NORTHERN TRUST CORP	Decreased	1.3M(-42.9%)	$975,783	0.0%	-67.31%	0
VFVANGUARD FIDUCIARY TRUST CO	New	1.1M	$864,753	0.0%	-16.84%	34
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	Decreased	457,571(-2.3%)	$354,160	0.0%	-69.12%	0
Nuveen, LLC	Increased	451,367(+0.9%)	$349,358	0.0%	-54.87%	24
GOLDMAN SACHS GROUP INC	Increased	444,177(+14.8%)	$343,793	0.0%	-67.28%	18
Invesco Ltd.	Increased	406,690(+1.0%)	$314,778	0.0%	-46.41%	16
XTX Topco Ltd	Decreased	389,254(-15.7%)	$301,283	0.0%	-39.19%	0
ALLIANCEBERNSTEIN L.P.	Unchanged	272,180	$299,398	0.0%	-56.40%	0
Bank of New York Mellon Corp	Decreased	383,088(-5.7%)	$296,510	0.0%	-67.44%	0

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QSIQUANTUM SI INC

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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