13FBOX
QUANTUM SI INC COM CL A · 13F Institutional Holdings
Options Calculator Rankings
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Q

QUANTUM SI INC COM CL A

QSI
Institutions
140
Combined AUM (Q2 2026)
$48.7M
Combined Shares (Q2 2026)
55.0M
Overall Trend
Decrease
All institutions combined
Basis: holder count and combined value / shares merge all share classes of the same company (e.g. Class A / C); each institution is counted once, and value & shares are the sum across classes.
📥 Inflow (Q1 2026→Q2 2026)
+9.5M
60 institutions added · 27 new buys
Est. buy amount
📤 Outflow (Q1 2026→Q2 2026)
-19.8M
100 institutions reduced · 43 exits
Est. sell amount
⚖️ Net Share Change
-10.3M
Net Sell
💰 Est. Net Value
≈ —
est. price
Latest AUM (Q2 2026)
$48.7M
Institutions
140
New Buys
27
Adds
33
Reduces
57
Exits
43
Unchanged
23
Ownership TrendPortfolio %Prev Q %RankQ2 2026 ValueQ2 2026 SharesPrev Q ValuePrev Q SharesShares ChangeAction
VANGUARD CAPITAL MANAGEMENT LLC
<0.01%<0.01%#70$6.7M7.6M$5.4M7.0M+556,301+7.92%Add
ARK Investment Management LLC
0.04%0.04%#3$6.3M7.2M$5.3M6.9M+288,839+4.20%Add
BlackRock, Inc.
<0.01%<0.01%#82$4.6M5.2M$10.4M13.4M-8.2M-61.05%Reduce
Amova Asset Management Americas, Inc.
0.04%0.05%#2$3.5M3.9M$3.4M4.4M-506,436-11.53%Reduce
Sumitomo Mitsui Trust Group, Inc.
<0.01%<0.01%#24$3.4M3.9M$3.4M4.4M-506,436-11.53%Reduce
MILLENNIUM MANAGEMENT LLC
<0.01%#41$2.8M3.1M$00+3.1MNew Buy
UBS Group AG
<0.01%<0.01%#52$2.3M2.6M$1.3M1.7M+859,370+50.48%Add
JANE STREET GROUP, LLC
<0.01%<0.01%#60$2.1M2.4M$218,732282,600+2.1M+757.69%Add
AQR CAPITAL MANAGEMENT LLC
<0.01%<0.01%#42$2.1M2.3M$1.9M2.4M-43,514-1.82%Reduce
GEODE CAPITAL MANAGEMENT, LLC
<0.01%<0.01%#74$2.0M2.2M$3.0M3.8M-1.6M-41.68%Reduce
SUSQUEHANNA INTERNATIONAL GROUP, LLP
<0.01%<0.01%#73$1.4M1.5M$1.5M1.9M-402,518-20.75%Reduce
VANGUARD FIDUCIARY TRUST CO
<0.01%<0.01%#56$988,2641.1M$864,7531.1M-569-0.05%Reduce
STATE STREET CORP
<0.01%<0.01%#106$788,306890,741$2.9M3.8M-2.9M-76.38%Reduce
GROUP ONE TRADING LLC
<0.01%<0.01%#40$700,276791,273$449,524580,781+210,492+36.24%Add
IMC-Chicago, LLC
<0.01%<0.01%#65$663,536749,758$522,432674,976+74,782+11.08%Add
Fosun International Ltd
0.15%0.14%#1$658,382743,935$575,806743,93500.00%Unchanged
RENAISSANCE TECHNOLOGIES LLC
<0.01%<0.01%#44$490,176553,871$91,255117,900+435,971+369.78%Add
SIMPLEX TRADING, LLC
<0.01%<0.01%#50$484,530547,493$346,464447,631+99,862+22.31%Add
VANGUARD PORTFOLIO MANAGEMENT LLC
<0.01%<0.01%#107$439,932497,098$1.2M1.5M-1.0M-67.31%Reduce
GOLDMAN SACHS GROUP INC
<0.01%<0.01%#93$421,515476,288$343,793444,177+32,111+7.23%Add
NORTHERN TRUST CORP
<0.01%<0.01%#89$398,720450,531$975,7831.3M-810,170-64.26%Reduce
Invesco Ltd.
<0.01%<0.01%#101$392,877443,929$314,778406,690+37,239+9.16%Add
BNP PARIBAS FINANCIAL MARKETS
<0.01%<0.01%#62$352,759398,598$29,71438,390+360,208+938.29%Add
IEQ CAPITAL, LLC
<0.01%<0.01%#32$310,472350,816$276,850357,688-6,872-1.92%Reduce
CITADEL ADVISORS LLC
<0.01%<0.01%#97$294,647332,935$169,929219,546+113,389+51.65%Add
MORGAN STANLEY
<0.01%<0.01%#111$286,282323,482$382,111271,000+52,482+19.37%Add
IQ EQ FUND MANAGEMENT (IRELAND) Ltd
0.02%0.02%#6$284,204321,134$226,091292,107+29,027+9.94%Add
Knollwood Investment Advisory, LLC
0.02%0.02%#5$265,500300,000$232,200300,00000.00%Unchanged
BRIDGEWAY CAPITAL MANAGEMENT, LLC
<0.01%<0.01%#21$182,399206,100$202,091261,100-55,000-21.06%Reduce
BARCLAYS PLC
<0.01%<0.01%#96$182,035205,690$30,29339,137+166,553+425.56%Add
XTX Topco Ltd
<0.01%0.01%#23$157,247177,680$301,283389,254-211,574-54.35%Reduce
Verdence Capital Advisors LLC
0.01%0.01%#12$140,100158,305$157,784203,855-45,550-22.34%Reduce
Mariner, LLC
<0.01%<0.01%#69$139,553157,689$154,546199,692-42,003-21.03%Reduce
Shay Capital LLC
0.01%0.01%#8$133,566150,922$116,814150,92200.00%Unchanged
FMR LLC
<0.01%<0.01%#127$109,534123,767$24,74331,968+91,799+287.16%Add
JONES FINANCIAL COMPANIES LLLP
<0.01%<0.01%#95$85,812100,483$83,964109,900-9,417-8.57%Reduce
HRT FINANCIAL LP
<0.01%#67$82,87893,647$00+93,647New Buy
AlphaCore Capital LLC
<0.01%<0.01%#31$79,21689,493$99,420128,449-38,956-30.33%Reduce
Cerity Partners LLC
<0.01%<0.01%#78$75,53385,347$62,42380,650+4,697+5.82%Add
Vanguard Global Advisers, LLC
<0.01%<0.01%#94$75,01084,757$65,60284,75700.00%Unchanged
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
<0.01%<0.01%#115$74,88284,612$354,160457,571-372,959-81.51%Reduce
Y-Intercept (Hong Kong) Ltd
<0.01%#33$69,99479,089$00+79,089New Buy
JTC Employer Solutions Trustee Ltd
0.01%<0.01%#14$68,84277,787$27,00034,540+43,247+125.21%Add
MERCER GLOBAL ADVISORS INC /ADV
<0.01%<0.01%#79$68,30277,177$42,72155,195+21,982+39.83%Add
RHUMBLINE ADVISERS
<0.01%<0.01%#85$67,24975,989$149,425193,068-117,079-60.64%Reduce
WINTON GROUP Ltd
<0.01%#22$67,08375,800$00+75,800New Buy
CAPTRUST FINANCIAL ADVISORS
<0.01%<0.01%#75$64,71873,128$53,42769,036+4,092+5.93%Add
HOLLENCREST CAPITAL MANAGEMENT
<0.01%<0.01%#19$57,53565,011$31,04640,111+24,900+62.08%Add
GSA CAPITAL PARTNERS LLP
<0.01%#20$53,11060,011$00+60,011New Buy
BANK OF AMERICA CORP /DE/
<0.01%<0.01%#130$52,73359,585$125,377161,987-102,402-63.22%Reduce

🧭 Institutional Sector Flow Heatmap

Net Outflow Net Inflow