DOSSIER · 13F Holders · Q2 2026
QSI

QUANTUM SI INC

140 institutions still hold QUANTUM SI INC as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 74765K105·140 13F holders·last filed Jun 30, 2026
Market cap
—
13F value held
$40M
visible holders
Holders
140
filers reporting
Concentration
16.63%
VANGUARD CAPITAL MANAGEMENT LLC #1
top holder share
AI Holders Summary · Q2 2026

140 institutions reported QSI in Q2 2026. VANGUARD CAPITAL MANAGEMENT LLC leads at 16.6% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$7M7.6M0.00%Q2 2026
02
ARK Investment Management LLC
CIK 0001697748
$6M7.2M0.04%Q2 2026
03
BlackRock, Inc.
CIK 0002012383
$5M5.2M0.00%Q2 2026
04
Amova Asset Management Americas, Inc.
CIK 0001480751
$3M3.9M0.04%Q2 2026
05
Sumitomo Mitsui Trust Group, Inc.
CIK 0001475365
$3M3.9M0.00%Q2 2026
06
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$3M3.1M0.00%Q2 2026
07
UBS Group AG
CIK 0001610520
$2M2.6M0.00%Q2 2026
08
AQR CAPITAL MANAGEMENT LLC
CIK 0001167557
$2M2.3M0.00%Q2 2026
09
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$2M2.2M0.00%Q2 2026
10
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 0001446194· Market maker
$1M1.5M0.00%Q2 2026
11
VANGUARD FIDUCIARY TRUST CO
CIK 0000933478· Index
$988K1.1M0.00%Q2 2026
12
STATE STREET CORP
CIK 0000093751
$788K891K0.00%Q2 2026
13
Fosun International Ltd
CIK 0001447884
$658K744K0.15%Q2 2026
14
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
$490K554K0.00%Q2 2026
15
Vanguard Portfolio Management
CIK 0002100121· Index
$440K497K0.00%Q2 2026
16
GOLDMAN SACHS GROUP INC
CIK 0000886982
$422K476K0.00%Q2 2026
17
NORTHERN TRUST CORP
CIK 0000073124· Index
$399K451K0.00%Q2 2026
18
Invesco Ltd.
CIK 0000914208
$393K444K0.00%Q2 2026
19
WOLVERINE TRADING, LLC
CIK 0000927337
$378K273K0.00%Q3 2025
20
BNP PARIBAS FINANCIAL MARKETS
CIK 0001166588
$353K399K0.00%Q2 2026
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120 more holders available. Log in →
Insiders at QUANTUM SI INC
Lapointe Christian →Keyes Jeffry R. →Hawkins Jeffrey Alan →Vieceli John S. →Rothberg Jonathan M →Kummeth Charles R. →Rakin Kevin →Mendel Scott →