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Disclosery

QSI QUANTUM SI INC

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COM CL A (common), issuer CIK 1816431

135 managers (136 13F filers) reported a position in QSI shares at 2025-06-30, 64,363,717 shares in all. 15 filers opened a position and 16 filers sold out during the quarter.

Managers
135
13F filers
136
New
15
Added
56
Reduced
35
Sold out
16
Shares held by filers
64,363,717

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q2 2025

Filers in the available 13F reports with a share position at 2025-06-30, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
BlackRock, Inc.in group BlackRock, Inc.10,848,142$21.3M<0.01%+1,407,89913F-HRTimelineGroup
VANGUARD GROUP INCgroup of 2 filers holding8,693,752$17M+1,777,413Timeline
ARK Investment Management LLCin group ARK Investment Management LLC7,960,736$15.6M0.11%-752,76513F-HRTimelineGroup
Sumitomo Mitsui Trust Group, Inc.in group Sumitomo Mitsui Trust Group, …5,621,303$11M0.01%-190,12713F-HRTimelineGroup
Amova Asset Management Americas, Inc.in group Amova Asset Management Americ…5,621,303$11M0.11%-190,12713F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC3,779,259$7.41M0.01%-155,02613F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC3,447,738$6.76M<0.01%+452,85013F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP2,756,437$5.4M<0.01%+302,33113F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP2,289,456$4.49M<0.01%+1,267,33813F-HRTimelineGroup
Nuveen, LLCin group TIAA1,126,084$2.21M<0.01%+806,98413F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…986,084$1.93M<0.01%+189,15413F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC894,100$1.75M<0.01%+452,78613F-HRTimelineGroup
UBS Group AGin group UBS Group AG789,570$1.55M<0.01%+339,88813F-HRTimelineGroup
Fosun International Ltd743,935$1.46M0.41%013F-HRTimeline
TWO SIGMA INVESTMENTS, LPgroup of 2 filers holding564,442$1.11M-331,433Timeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC558,307$1.09M<0.01%+419,80913F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/465,999$913K<0.01%+377,50413F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA460,289$902K<0.01%+446,86013F-HR/ATimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co431,447$846K<0.01%+64,00313F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp352,732$691K<0.01%+57,82613F-HRTimelineGroup
Knollwood Investment Advisory, LLC300,000$588K0.06%013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY289,913$568K<0.01%+2,42513F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC284,753$558K<0.01%new13F-HRTimelineGroup
GSA CAPITAL PARTNERS LLP284,363$557K0.04%+38,17113F-HRTimeline
ALLIANCEBERNSTEIN L.P.272,180$533K<0.01%+162,00013F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC239,001$468K<0.01%+118,11313F-HR/ATimelineGroup
Green Alpha Advisors, LLC228,348$448K0.43%-15,71913F-HRTimeline
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC223,100$437K<0.01%new13F-HRTimelineGroup
RHUMBLINE ADVISERS203,967$400K<0.01%+53,99413F-HRTimeline
Pathstone Holdings, LLCin group Pathstone Holdings, LLC198,798$390K<0.01%-15,51113F-HRTimelineGroup
BRIDGEWAY CAPITAL MANAGEMENT, LLC196,100$384K0.01%013F-HRTimeline
Invesco Ltd.in group Invesco Ltd.195,450$383K<0.01%+91,79313F-HRTimelineGroup
GROUP ONE TRADING LLC134,632$264K0.01%new13F-HRTimeline
Shay Capital LLC129,631$254K0.06%+1,13113F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC121,703$239K<0.01%+25,66113F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/120,506$237K<0.01%+12,33213F-HRTimeline
IQ EQ FUND MANAGEMENT (IRELAND) Ltd116,828$229K0.02%+46,88413F-HRTimeline
SIMPLEX TRADING, LLC105,534$206K0.01%+62,62513F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN101,716$199K<0.01%+18,38313F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\98,532$193K<0.01%+31,01013F-HRTimelineGroup
RENAISSANCE TECHNOLOGIES LLC89,200$175K<0.01%-782,55613F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC88,497$173K<0.01%+27,13213F-HRTimeline
AlphaCore Capital LLC83,950$165K0.01%new13F-HRTimeline
Sculptor Capital LPin group Sculptor Capital LP78,200$153K<0.01%013F-HRTimelineGroup
MetLife Investment Management, LLCin group MetLife Investment Management…77,316$152K<0.01%+1,30113F-HRTimelineGroup
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…77,215$151K<0.01%+6,66313F-HRTimelineGroup
EWA, LLC68,200$134K0.04%-10,48813F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO66,656$131K<0.01%+9,00513F-HRTimelineGroup
AXQ CAPITAL, LP57,000$112K0.04%new13F-HRTimeline
Mariner, LLCin group Mariner, LLC50,594$99.2K<0.01%+2,58913F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC49,107$96.2K<0.01%-35,35213F-HRTimelineGroup
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …49,082$96.2K<0.01%+10,56413F-HRTimelineGroup
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP46,900$91.5K<0.01%+43,90013F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd46,474$91.1K<0.01%-322,49413F-HRTimelineGroup
WOLVERINE TRADING, LLC40,425$78.8K<0.01%-3313F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC38,863$76.2K<0.01%+9,31113F-HRTimelineGroup
Cambridge Investment Research Advisors,…38,867$76K<0.01%013F-HRTimeline
TWO SIGMA SECURITIES, LLC37,861$74.2K0.01%-14,35913F-HRTimeline
Red Wave Investments LLC37,000$72.5K0.02%013F-HRTimeline
Sanctuary Advisors, LLC36,337$71.2K<0.01%-44513F-HRTimeline
CAPTRUST FINANCIAL ADVISORS34,310$67.2K<0.01%-27313F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO33,103$64.9K<0.01%013F-HRTimelineGroup
SG Americas Securities, LLC32,181$63K<0.01%-7,89813F-HRTimeline
Police & Firemen's Retirement System of…31,134$61K<0.01%013F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…29,901$58.6K<0.01%-8,35613F-HRTimelineGroup
ProShare Advisors LLC28,924$56.7K<0.01%+2,90813F-HRTimeline
Wealth Management Associates, Inc.26,950$52.8K0.02%013F-HRTimeline
SBI Securities Co., Ltd.26,141$51.2K<0.01%+7,17113F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND26,084$51.1K<0.01%013F-HR/ATimeline
COMMONWEALTH EQUITY SERVICES, LLC25,515$50K<0.01%-15,35313F-HRTimeline
MERCER GLOBAL ADVISORS INC /ADV25,260$49.5K<0.01%-1,85313F-HRTimeline
HOLLENCREST CAPITAL MANAGEMENT25,000$49K<0.01%+5,00013F-HRTimeline
Leonteq Securities AG25,000$49K<0.01%013F-HRTimeline
HBW ADVISORY SERVICES LLC24,253$47.5K0.01%+1013F-HRTimeline
LPL Financial LLC23,290$45.6K<0.01%+3,17813F-HRTimeline
Atom Investors LP20,803$40.8K<0.01%-9,36913F-HRTimeline
Kingsview Wealth Management, LLC20,012$39.2K<0.01%+10,00013F-HRTimeline
Jefferies Financial Group Inc.in group Jefferies Financial Group Inc.20,000$39.2K<0.01%-63,03113F-HRTimelineGroup
DLK Investment Management, LLC19,750$38.7K0.01%+75013F-HRTimeline
Cetera Investment Advisers18,771$36.8K<0.01%-33013F-HRTimeline
FMR LLCin group FMR LLC18,520$36.3K<0.01%-61,10313F-HRTimelineGroup
Stratos Wealth Advisors, LLCin group Stratos Wealth Partners, LTD.17,860$35K<0.01%-45013F-HRTimelineGroup
CIBC WORLD MARKETS CORP17,379$34.1K<0.01%-9,28813F-HRTimeline
WOLVERINE ASSET MANAGEMENT LLCin group WOLVERINE ASSET MANAGEMENT LLC16,501$32.3K<0.01%+9,62613F-HRTimelineGroup
VICTORY CAPITAL MANAGEMENT INC16,217$31.8K<0.01%-37613F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS15,133$29.7K<0.01%+6,51613F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…14,907$29.2K<0.01%-6,11913F-HRTimelineGroup
Cerity Partners LLCin group Cerity Partners LLC14,881$29.2K<0.01%new13F-HRTimelineGroup
MARK SHEPTOFF FINANCIAL PLANNING, LLC14,500$28.4K0.02%013F-HRTimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…14,401$28.2K<0.01%+4,49513F-HRTimelineGroup
Flagship Private Wealth, LLC14,158$27.8K0.01%013F-HR/ATimeline
CIBC WORLD MARKET INC.14,011$27.5K<0.01%-6,00013F-HRTimeline
HSBC HOLDINGS PLCin group HSBC HOLDINGS PLC13,717$27.2K<0.01%-27013F-HRTimelineGroup
Procyon Advisors, LLC13,671$26.8K<0.01%013F-HRTimeline
NEUBERGER BERMAN GROUP LLCin group NEUBERGER BERMAN GROUP LLC13,430$26.3K<0.01%-2,48913F-HR/ATimelineGroup
JTC Employer Solutions Trustee Ltd13,340$26K<0.01%new13F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc12,860$25.2K<0.01%+3,56613F-HRTimelineGroup
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC12,850$25.2K<0.01%new13F-HRTimelineGroup
STATE BOARD OF ADMINISTRATION OF FLORID…12,300$24.1K<0.01%013F-HRTimeline
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC12,036$23.6K<0.01%new13F-HRTimelineGroup
XPONANCE LLC11,051$21.7K<0.01%new13F-HRTimeline
Callan Family Office, LLCin group Callan Family Office, LLC10,379$20.3K<0.01%new13F-HRTimelineGroup
NewEdge Advisors, LLC10,250$20.1K<0.01%013F-HRTimeline
Kestra Advisory Services, LLCin group Kestra Advisory Services, LLC10,132$19.9K<0.01%-4,95813F-HRTimelineGroup
Ground Swell Capital, LLC10,100$19.8K0.03%new13F-HRTimeline
Capital Investment Advisory Services, L…10,000$19.6K<0.01%013F-HRTimeline
TriaGen Wealth Management LLC10,000$19.6K0.01%013F-HRTimeline
Glen Eagle Advisors, LLC10,000$19.6K<0.01%013F-HRTimeline
Headlands Technologies LLC9,322$18.3K<0.01%+8,99713F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…8,801$17.2K<0.01%+1,54413F-HRTimeline
CWM, LLCin group CWM, LLC8,911$17K<0.01%+5,33413F-HRTimelineGroup
Belvedere Trading LLC7,222$14.2K<0.01%new13F-HRTimeline
PRINCIPAL SECURITIES, INC.in group PRINCIPAL FINANCIAL GROUP INC6,641$13K<0.01%+1,72913F-HRTimelineGroup
MTM Investment Management, LLC4,125$8.09K<0.01%new13F-HRTimeline
AMALGAMATED BANK4,142$8K<0.01%013F-HRTimeline
N.E.W. Advisory Services LLC3,854$7.55K<0.01%013F-HRTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC3,700$7.25K<0.01%-89,17513F-HRTimelineGroup
PINNEY & SCOFIELD, INC.3,680$7.21K<0.01%013F-HRTimeline
FNY Investment Advisers, LLC4,000$7K<0.01%013F-HRTimeline
Sterling Capital Management LLC3,395$6.65K<0.01%+1,32113F-HR/ATimeline
Archer Investment Corp2,000$3.92K<0.01%013F-HRTimeline
Talon Private Wealth, LLC2,000$3.92K<0.01%new13F-HRTimeline
NISA INVESTMENT ADVISORS, LLC1,324$2.6K<0.01%+20813F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.1,258$2.44K<0.01%+13813F-HR/ATimelineGroup
Allworth Financial LP836$1.64K<0.01%013F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…828$1.62K<0.01%+27113F-HRTimelineGroup
TD Waterhouse Canada Inc.800$1.52K<0.01%013F-HRTimeline
NATIONAL BANK OF CANADA /FI/in group NATIONAL BANK OF CANADA /FI/600$1.18K<0.01%-10,50013F-HR/ATimelineGroup
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…548$1.07K<0.01%+5913F-HRTimelineGroup
Bangor Savings Bank400$784<0.01%013F-HRTimeline
Medallion Wealth Advisors, LLC242$460<0.01%-1913F-HRTimeline
FSA Wealth Management LLC100$196<0.01%013F-HRTimeline
Federation des caisses Desjardins du Qu…50$98<0.01%013F-HRTimeline
Capital Advisors, Ltd. LLC58$00%-213F-HRTimelineValue filed as zero, left out of ratios.
CONCOURSE FINANCIAL GROUP SECURITIES, I…0$0013F-HRTimelineValue filed as zero, left out of ratios. Amount filed as zero, left out of ratios.