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Disclosery

QSI QUANTUM SI INC

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COM CL A (common), issuer CIK 1816431

137 managers (141 13F filers) reported a position in QSI shares at 2026-06-30, 52,851,049 shares in all. 27 filers opened a position and 41 filers sold out during the quarter.

Managers
137
13F filers
141
New
27
Added
34
Reduced
58
Sold out
41
Shares held by filers
52,851,049

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 2026

Filers in the available 13F reports with a share position at 2026-06-30, 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
VANGUARD GROUP INCgroup of 5 filers holding9,297,096$8.23M-471,457Timeline
ARK Investment Management LLC7,167,738$6.34M0.04%+288,83913F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.5,225,352$4.62M<0.01%-8,189,59713F-HRTimelineGroup
Amova Asset Management Americas, Inc.in group Amova Asset Management Americ…3,885,230$3.46M0.04%-506,43613F-HRTimelineGroup
Sumitomo Mitsui Trust Group, Inc.in group Sumitomo Mitsui Trust Group, …3,885,230$3.44M<0.01%-506,43613F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC3,131,726$2.77M<0.01%new13F-HRTimelineGroup
UBS Group AGin group UBS Group AG2,561,897$2.27M<0.01%+859,37013F-HRTimelineGroup
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC2,348,665$2.08M<0.01%-43,51413F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC2,236,526$1.98M<0.01%-1,598,59513F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC2,142,735$1.9M<0.01%new13F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…1,116,750$988K<0.01%-347,81813F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP890,741$788K<0.01%-2,879,94813F-HRTimelineGroup
Fosun International Ltd743,935$658K0.15%013F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC553,871$490K<0.01%+435,97113F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC476,288$422K<0.01%+32,11113F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP450,531$399K<0.01%-810,17013F-HRTimelineGroup
Invesco Ltd.in group Invesco Ltd.443,929$393K<0.01%+37,23913F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS398,598$353K<0.01%+360,20813F-HRTimelineGroup
IEQ CAPITAL, LLC350,816$310K<0.01%-6,87213F-HRTimeline
Aster Capital Management (DIFC) Ltd344,510$305K0.06%new13F-HR/ATimeline
MORGAN STANLEYin group MORGAN STANLEY323,482$286K<0.01%+193,54213F-HRTimelineGroup
IQ EQ FUND MANAGEMENT (IRELAND) Ltd321,134$284K0.02%+29,02713F-HRTimeline
Knollwood Investment Advisory, LLC300,000$266K0.02%013F-HRTimeline
IMC-Chicago, LLC285,758$253K<0.01%+64,88213F-HRTimeline
BRIDGEWAY CAPITAL MANAGEMENT, LLC206,100$182K<0.01%-55,00013F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC205,690$182K<0.01%+166,55313F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd177,680$157K<0.01%-211,57413F-HRTimelineGroup
SIMPLEX TRADING, LLC165,293$146K<0.01%+74,76213F-HRTimeline
Verdence Capital Advisors LLC158,305$140K0.01%-45,55013F-HRTimeline
Mariner, LLCin group Mariner, LLC157,689$140K<0.01%-42,00313F-HRTimelineGroup
Shay Capital LLC150,922$134K0.01%013F-HRTimeline
FMR LLCin group FMR LLC123,767$110K<0.01%+91,79913F-HRTimelineGroup
GROUP ONE TRADING LLC107,473$95.1K<0.01%-176,50813F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP100,483$85.8K<0.01%-9,41713F-HRTimelineGroup
HRT FINANCIAL LP93,647$82K<0.01%new13F-HRTimeline
AlphaCore Capital LLC89,368$79.1K<0.01%-39,08113F-HRTimeline
Cerity Partners LLCin group Cerity Partners LLC85,347$75.5K<0.01%+4,69713F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co84,612$74.9K<0.01%-372,95913F-HRTimelineGroup
Y-Intercept (Hong Kong) Ltd79,089$70K<0.01%new13F-HRTimeline
JTC Employer Solutions Trustee Ltd77,787$69K0.01%+43,24713F-HRTimeline
MERCER GLOBAL ADVISORS INC /ADV77,277$68.4K<0.01%+22,08213F-HR/ATimeline
RHUMBLINE ADVISERS75,989$67.2K<0.01%-117,07913F-HRTimeline
WINTON GROUP Ltdin group WINTON GROUP Ltd75,800$67.1K<0.01%new13F-HRTimelineGroup
CAPTRUST FINANCIAL ADVISORS73,128$64.7K<0.01%+4,09213F-HRTimeline
HOLLENCREST CAPITAL MANAGEMENT65,011$57.5K<0.01%+24,90013F-HRTimeline
GSA CAPITAL PARTNERS LLP60,011$53K<0.01%new13F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/59,585$52.7K<0.01%-102,40213F-HRTimelineGroup
Creative Planningin group Creative Planning55,884$49.5K<0.01%+3,33613F-HRTimelineGroup
Atom Investors LP51,554$45.6K<0.01%new13F-HRTimeline
WEALTH ENHANCEMENT ADVISORY SERVICES, L…63,435$45.2K<0.01%-26,10113F-HRTimeline
Green Alpha Advisors, LLC45,921$40.6K0.03%+2,71313F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC44,335$39.2K<0.01%+28,78913F-HRTimelineGroup
Sanctuary Advisors, LLC41,397$36.6K<0.01%-1,42713F-HRTimeline
Stratos Wealth Advisors, LLCin group Stratos Wealth Partners, LTD.40,036$35.4K<0.01%+25,00013F-HRTimelineGroup
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.39,133$34.6K<0.01%new13F-HRTimelineGroup
BRIGHTON JONES LLC38,585$34.1K<0.01%+11,02513F-HRTimeline
Corient Private Wealth LPin group Corient Private Wealth LP38,328$33.9K<0.01%new13F-HR/ATimelineGroup
Cambridge Investment Research Advisors,…37,809$33K<0.01%-4,00013F-HR/ATimeline
Red Wave Investments LLC37,000$32.7K0.01%013F-HRTimeline
Arax Advisory Partners36,790$32.6K<0.01%+35,42613F-HRTimeline
SBI Securities Co., Ltd.33,009$29.2K<0.01%+87613F-HRTimeline
China Universal Asset Management Co., L…31,484$27.9K<0.01%-3,21813F-HRTimeline
Kovack Advisors, Inc.31,000$27.4K<0.01%+1,00013F-HRTimeline
IPG Investment Advisors LLC30,864$27.3K<0.01%new13F-HRTimeline
Nuveen, LLCin group TIAA30,077$26.6K<0.01%-421,29013F-HRTimelineGroup
Northern Lights Advisors, Inc.29,989$26.5K0.01%013F-HRTimeline
COMMONWEALTH EQUITY SERVICES, LLC27,100$24K<0.01%-2,69213F-HRTimeline
Wealth Management Associates, Inc.26,350$23.3K0.01%-60013F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…23,758$21K<0.01%-1,18513F-HRTimelineGroup
Merit Financial Group, LLC23,616$20.9K<0.01%-12,73113F-HR/ATimeline
Pallas Capital Advisors LLC23,320$20.6K<0.01%-2,43713F-HRTimeline
DLK Investment Management, LLC19,000$19.9K0.01%+2,25013F-HRTimeline
Leonteq Securities AG22,500$19.9K<0.01%-2,50013F-HRTimeline
HBW ADVISORY SERVICES LLC22,292$19.7K<0.01%-40513F-HRTimeline
NEUBERGER BERMAN GROUP LLCin group NEUBERGER BERMAN GROUP LLC21,766$19.3K<0.01%new13F-HRTimelineGroup
LPL Financial LLC20,985$18.6K<0.01%-1,48213F-HRTimeline
Capital Investment Advisory Services, L…20,000$17.7K<0.01%013F-HRTimeline
VICTORY CAPITAL MANAGEMENT INC19,630$17.4K<0.01%-17813F-HRTimeline
ANCHYRA PARTNERS LLC18,974$16.8K<0.01%new13F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp18,805$16.6K<0.01%-364,28313F-HRTimelineGroup
Focus Partners Wealthgroup of 2 filers holding17,219$15.2K-22,771Timeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO17,071$15.2K<0.01%-66,44813F-HRTimelineGroup
SG Americas Securities, LLC17,505$15K<0.01%-16,17213F-HRTimeline
Flagship Private Wealth, LLC14,158$12.5K<0.01%013F-HRTimeline
Procyon Advisors, LLC13,671$12.1K<0.01%013F-HRTimeline
Balyasny Asset Management L.P.in group Balyasny Asset Management13,629$12.1K<0.01%new13F-HRTimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC13,008$11.5K<0.01%new13F-HRTimelineGroup
Laurion Capital Management LP12,749$11.3K<0.01%new13F-HRTimeline
NorthCrest Asset Manangement, LLC11,218$10.8K<0.01%-92613F-HRTimeline
Callan Family Office, LLCin group Callan Family Office, LLC12,119$10.7K<0.01%new13F-HRTimelineGroup
Jefferies Financial Group Inc.in group Jefferies Financial Group Inc.11,350$10K<0.01%new13F-HRTimelineGroup
Integrated Wealth Concepts LLC11,333$10K<0.01%-3,16613F-HRTimeline
NewEdge Advisors, LLC11,168$9.88K<0.01%-4,65213F-HRTimeline
Abel Hall, LLC11,060$9.79K<0.01%new13F-HRTimeline
Krilogy Financial LLC10,635$9.41K<0.01%-6,09413F-HRTimeline
Schonfeld Strategic Advisors LLC10,439$9.24K<0.01%new13F-HRTimeline
Cresset Asset Management, LLC10,207$9.03K<0.01%013F-HRTimeline
Apollon Wealth Management, LLCin group Apollon Wealth Management, LLC10,056$8.9K<0.01%new13F-HRTimelineGroup
KESTRA PRIVATE WEALTH SERVICES, LLCin group Kestra Advisory Services, LLC10,000$8.85K<0.01%013F-HRTimelineGroup
Verde Capital Management10,000$8.85K<0.01%new13F-HRTimeline
Glen Eagle Advisors, LLC10,000$8.85K<0.01%013F-HRTimeline
RED REEF ADVISORS LLC10,000$8.85K0.01%013F-HRTimeline
Mirae Asset Global Investments Co., Ltd.group of 2 filers holding8,847$7.83K-76,281Timeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA8,465$7K<0.01%+8,35613F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.7,813$6.95K<0.01%-15713F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…7,551$6.68K<0.01%-4,29713F-HRTimelineGroup
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…5,417$4.79K<0.01%-3813F-HRTimelineGroup
Allworth Financial LP4,814$4.26K<0.01%-2,01513F-HRTimeline
CITIGROUP INCin group CITIGROUP INC4,659$4.12K<0.01%-8,65513F-HRTimelineGroup
GF FUND MANAGEMENT CO. LTD.4,185$3.7K<0.01%+46213F-HRTimeline
MTM Investment Management, LLC4,125$3.65K<0.01%013F-HRTimeline
N.E.W. Advisory Services LLC3,854$3.41K<0.01%013F-HRTimeline
PINNEY & SCOFIELD, INC.3,680$3.26K<0.01%013F-HRTimeline
FNY Investment Advisers, LLC4,000$3K<0.01%013F-HRTimeline
Essential Partners LLC3,094$2.74K<0.01%-12,34213F-HRTimeline
IFP Advisors, Inc2,020$1.79K<0.01%-8113F-HRTimeline
Steward Partners Investment Advisory, L…2,000$1.77K<0.01%013F-HRTimeline
Archer Investment Corp2,000$1.77K<0.01%013F-HR/ATimeline
ROTHSCHILD INVESTMENT LLC1,436$1.27K<0.01%-25213F-HRTimeline
GAMMA Investing LLC1,373$1.22K<0.01%-45713F-HRTimeline
Fortitude Family Office, LLC1,245$1.1K<0.01%new13F-HRTimeline
Farther Finance Advisors, LLC959$849<0.01%-37513F-HRTimeline
True Wealth Design, LLC720$638<0.01%+21313F-HRTimeline
Rialto Wealth Management, LLC562$498<0.01%+5313F-HRTimeline
Bangor Savings Bank500$443<0.01%+39513F-HRTimeline
TD Waterhouse Canada Inc.300$276<0.01%013F-HRTimeline
Larson Financial Group LLC300$266<0.01%new13F-HRTimeline
HARBOUR INVESTMENTS, INC.299$265<0.01%+4913F-HRTimeline
Medallion Wealth Advisors, LLC242$213<0.01%-22813F-HRTimeline
GILL CAPITAL PARTNERS, LLC200$177<0.01%013F-HRTimeline
SJS Investment Consulting Inc.185$164<0.01%+6613F-HRTimeline
Transamerica Financial Advisors, LLCin group Transamerica Financial Adviso…132$116<0.01%new13F-HRTimelineGroup
Clearstead Advisors, LLC53$47<0.01%new13F-HRTimeline
Federation des caisses Desjardins du Qu…50$44<0.01%013F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.30$27<0.01%-77613F-HRTimelineGroup
JPL Wealth Management, LLC26$24<0.01%new13F-HRTimeline
Caitong International Asset Management …1$1<0.01%-30413F-HRTimeline