DOSSIER · 13F Holders · Q1 2026
QSI

QUANTUM SI INC

165 institutions still hold QUANTUM SI INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 74765K105·165 13F holders·last filed Mar 31, 2026
Market cap
13F value held
$48M
visible holders
Holders
165
filers reporting
Concentration
21.77%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

165 institutions reported QSI in Q1 2026. BlackRock, Inc. leads at 21.8% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$10M13.4M0.00%Q1 2026
02
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$5M7.0M0.00%Q1 2026
03
ARK Investment Management LLC
CIK 0001697748
$5M6.9M0.04%Q1 2026
04
CITADEL ADVISORS LLC
CIK 0001423053
$4M3.5M0.00%Q4 2025
05
Amova Asset Management Americas, Inc.
CIK 0001480751
$3M4.4M0.05%Q1 2026
06
Sumitomo Mitsui Trust Group, Inc.
CIK 0001475365
$3M4.4M0.00%Q1 2026
07
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$3M3.8M0.00%Q1 2026
08
STATE STREET CORP
CIK 0000093751
$3M3.8M0.00%Q1 2026
09
AQR CAPITAL MANAGEMENT LLC
CIK 0001167557
$2M2.4M0.00%Q1 2026
10
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 0001446194· Market maker
$1M1.9M0.00%Q1 2026
11
UBS Group AG
CIK 0001610520
$1M1.7M0.00%Q1 2026
12
Vanguard Portfolio Management
CIK 0002100121· Index
$1M1.5M0.00%Q1 2026
13
NORTHERN TRUST CORP
CIK 0000073124· Index
$976K1.3M0.00%Q1 2026
14
VANGUARD FIDUCIARY TRUST CO
CIK 0000933478· Index
$865K1.1M0.00%Q1 2026
15
Fosun International Ltd
CIK 0001447884
$576K744K0.14%Q1 2026
16
WOLVERINE TRADING, LLC
CIK 0000927337
$378K273K0.00%Q3 2025
17
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
CIK 0000884546· Index
$354K458K0.00%Q1 2026
18
Nuveen, LLC
CIK 0001871926
$349K451K0.00%Q1 2026
19
GOLDMAN SACHS GROUP INC
CIK 0000886982
$344K444K0.00%Q1 2026
20
Invesco Ltd.
CIK 0000914208
$315K407K0.00%Q1 2026
Page 1 of 9
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Insiders at QUANTUM SI INC
Lapointe ChristianHawkins Jeffrey AlanVieceli John S.Keyes Jeffry R.Rothberg Jonathan MKummeth Charles R.Rakin KevinMendel Scott