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Disclosery

QSI QUANTUM SI INC

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COM CL A (common), issuer CIK 1816431

133 managers (135 13F filers) reported a position in QSI shares at 2025-12-31, 67,498,433 shares in all. 29 filers opened a position and 19 filers sold out during the quarter.

Managers
133
13F filers
135
New
29
Added
38
Reduced
37
Sold out
19
Shares held by filers
67,498,433

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, Q4 2025

Filers in the available 13F reports with a share position at 2025-12-31, 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.13,054,057$14.4M<0.01%+1,732,38413F-HRTimelineGroup
VANGUARD GROUP INCgroup of 2 filers holding9,630,821$10.6M+891,121Timeline
ARK Investment Management LLCin group ARK Investment Management LLC7,021,571$7.72M0.05%-602,47113F-HRTimelineGroup
Sumitomo Mitsui Trust Group, Inc.in group Sumitomo Mitsui Trust Group, …4,690,720$5.16M<0.01%-526,77913F-HRTimelineGroup
Amova Asset Management Americas, Inc.in group Amova Asset Management Americ…4,690,720$5.11M0.06%-526,77913F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC4,114,375$4.53M<0.01%+367,20613F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP3,562,721$3.92M<0.01%+745,23113F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC2,676,097$2.94M<0.01%+2,269,05013F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…2,327,785$2.56M<0.01%+286,69013F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP2,207,936$2.43M<0.01%-115,10613F-HRTimelineGroup
UBS Group AGin group UBS Group AG1,449,512$1.59M<0.01%+944,65313F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP1,384,181$1.52M<0.01%+868,32913F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC1,104,033$1.21M<0.01%-505,99013F-HRTimelineGroup
Fosun International Ltd743,935$818K0.19%013F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co468,174$515K<0.01%+8613F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd461,982$508K0.01%+311,45013F-HRTimelineGroup
Nuveen, LLCin group TIAA447,519$492K<0.01%013F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp406,291$447K<0.01%+11,38613F-HRTimelineGroup
Invesco Ltd.in group Invesco Ltd.402,821$443K<0.01%+107,09313F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY399,994$440K<0.01%+128,99413F-HR/ATimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC386,824$426K<0.01%-32713F-HR/ATimelineGroup
Knollwood Investment Advisory, LLC300,000$330K0.03%013F-HRTimeline
Quadrature Capital Ltdin group Quadrature Capital Ltd276,889$305K<0.01%new13F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.272,180$299K<0.01%013F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC269,415$296K<0.01%+48,20513F-HRTimelineGroup
BRIDGEWAY CAPITAL MANAGEMENT, LLC261,100$287K0.01%013F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/258,445$284K<0.01%-89,56213F-HRTimelineGroup
IQ EQ FUND MANAGEMENT (IRELAND) Ltd253,895$279K0.02%+64,72113F-HRTimeline
GROUP ONE TRADING LLC245,801$270K0.01%-131,97313F-HRTimeline
Virtu Financial LLCin group Virtu Financial LLC238,379$262K0.01%new13F-HRTimelineGroup
RHUMBLINE ADVISERS193,595$213K<0.01%-26,37013F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC191,791$211K<0.01%-2,478,16813F-HRTimelineGroup
Verdence Capital Advisors LLC187,805$207K0.01%+23,97513F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN176,132$194K<0.01%+40,18213F-HRTimelineGroup
LOS ANGELES CAPITAL MANAGEMENT LLC93,010$189K<0.01%new13F-HRTimeline
Shay Capital LLC149,132$164K0.03%-5,44013F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\119,028$131K<0.01%+6,94413F-HRTimelineGroup
HRT FINANCIAL LP104,292$114K<0.01%new13F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP98,900$109K<0.01%+5,40013F-HRTimelineGroup
FMR LLCin group FMR LLC97,925$108K<0.01%+7,40513F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/96,486$107K<0.01%+4,45213F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC86,689$95.4K<0.01%+2,86513F-HRTimelineGroup
Mirae Asset Global Investments Co., Ltd.group of 2 filers holding82,473$90.7K+9,497Timeline
SIMPLEX TRADING, LLC80,507$88.6K<0.01%-73,57613F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO76,909$84.6K<0.01%+13,62913F-HRTimelineGroup
INTECH INVESTMENT MANAGEMENT LLC65,636$72.2K<0.01%-9,12513F-HRTimeline
Mariner, LLCin group Mariner, LLC56,880$62.6K<0.01%+6,35113F-HRTimelineGroup
Green Alpha Advisors, LLC51,528$56.7K0.05%-164,50413F-HRTimeline
AlphaCore Capital LLC49,350$54.3K<0.01%-53,50013F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …48,372$53.2K<0.01%+70613F-HRTimelineGroup
Police & Firemen's Retirement System of…46,170$50.8K<0.01%013F-HRTimeline
Scientech Research LLC45,915$50.5K0.03%new13F-HRTimeline
Sanctuary Advisors, LLC42,413$46.7K<0.01%+5,89713F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…41,282$45.4K<0.01%new13F-HRTimeline
Cambridge Investment Research Advisors,…37,767$42K<0.01%-1,10013F-HRTimeline
Caitong International Asset Management …37,964$41.8K0.01%-21,81013F-HR/ATimeline
ProShare Advisors LLC37,341$41.1K<0.01%+10,48113F-HRTimeline
Red Wave Investments LLC37,000$40.7K0.01%013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS36,276$39.9K<0.01%+5,81213F-HRTimelineGroup
CAPTRUST FINANCIAL ADVISORS34,603$38.1K<0.01%-22513F-HRTimeline
JTC Employer Solutions Trustee Ltd34,540$38K<0.01%013F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…34,222$37.6K<0.01%-30,34613F-HRTimelineGroup
SBI Securities Co., Ltd.34,163$37.6K<0.01%+54713F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO33,103$36.4K<0.01%013F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…32,595$35.9K<0.01%+17,93413F-HRTimelineGroup
China Universal Asset Management Co., L…31,865$35.1K<0.01%new13F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP31,320$34.5K<0.01%new13F-HRTimelineGroup
Northern Lights Advisors, Inc.29,989$33K0.02%13F-HRTimeline
SG Americas Securities, LLC29,106$32K<0.01%-13,00113F-HRTimeline
COMMONWEALTH EQUITY SERVICES, LLC27,960$30.8K<0.01%-8,21913F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC27,246$30K<0.01%013F-HRTimelineGroup
Wealth Management Associates, Inc.26,950$29.6K0.01%-4,00013F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…26,893$29.6K<0.01%-5,11313F-HRTimelineGroup
NEUBERGER BERMAN GROUP LLCin group NEUBERGER BERMAN GROUP LLC26,820$29.5K<0.01%new13F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND26,084$28.7K<0.01%013F-HRTimeline
LPL Financial LLC25,217$27.7K<0.01%-3,24313F-HRTimeline
Leonteq Securities AG25,000$27.5K<0.01%013F-HRTimeline
HBW ADVISORY SERVICES LLC24,163$26.6K<0.01%-8013F-HRTimeline
Curbstone Financial Management Corp24,000$26.4K0.01%new13F-HRTimeline
Atom Investors LP21,995$24.2K<0.01%new13F-HRTimeline
Capital Investment Advisory Services, L…20,000$22K<0.01%013F-HRTimeline
VICTORY CAPITAL MANAGEMENT INC19,797$21.8K<0.01%+2,32113F-HRTimeline
CITIGROUP INCin group CITIGROUP INC19,776$21.8K<0.01%-3,89713F-HRTimelineGroup
Balyasny Asset Management L.P.in group Balyasny Asset Management19,300$21.2K<0.01%-50213F-HRTimelineGroup
Blueshift Asset Management, LLC17,442$19.2K0.01%new13F-HRTimeline
Kovack Advisors, Inc.16,800$18.5K<0.01%new13F-HR/ATimeline
Stratos Wealth Advisors, LLCin group Stratos Wealth Partners, LTD.15,036$16.5K<0.01%+1,50013F-HRTimelineGroup
Graham Capital Management, L.P.14,422$15.9K<0.01%new13F-HRTimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…14,401$15.8K<0.01%013F-HRTimelineGroup
Flagship Private Wealth, LLC14,158$15.6K0.01%013F-HRTimeline
NewEdge Advisors, LLC14,042$15.4K<0.01%+3,87213F-HRTimeline
Procyon Advisors, LLC13,671$15K<0.01%013F-HRTimeline
EWA, LLC13,632$15K<0.01%-3,48713F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc12,860$14.1K<0.01%013F-HRTimelineGroup
McAdam, LLC12,329$13.6K<0.01%new13F-HRTimeline
XPONANCE LLC11,824$13K<0.01%-12813F-HRTimeline
State of Wyoming11,089$12.2K<0.01%new13F-HRTimeline
CIBC WORLD MARKETS CORPin group CIBC Bancorp USA Inc.10,392$11.4K<0.01%13F-HRTimelineGroup
Cresset Asset Management, LLC10,207$11.2K<0.01%new13F-HRTimeline
Kestra Advisory Services, LLCin group Kestra Advisory Services, LLC10,090$11.1K<0.01%013F-HRTimelineGroup
HOLLENCREST CAPITAL MANAGEMENT10,000$11K<0.01%-25,00013F-HRTimeline
Glen Eagle Advisors, LLC10,000$11K<0.01%013F-HRTimeline
RED REEF ADVISORS LLC10,000$11K0.01%13F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…9,661$10.6K<0.01%+85413F-HRTimeline
Sterling Capital Management LLC9,054$9.96K<0.01%-1,78513F-HRTimeline
CWM, LLCin group CWM, LLC6,994$8K<0.01%+4,83813F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.7,101$7.81K<0.01%+5,88113F-HRTimelineGroup
GAMMA Investing LLC6,991$7.69K<0.01%new13F-HRTimeline
WOLVERINE ASSET MANAGEMENT LLCin group WOLVERINE ASSET MANAGEMENT LLC6,170$6.79K<0.01%-1,65513F-HRTimelineGroup
Blue Trust, Inc.5,000$5.5K<0.01%new13F-HRTimeline
TUCKER ASSET MANAGEMENT LLC4,714$5.18K<0.01%new13F-HRTimeline
AMALGAMATED BANK4,935$5K<0.01%+79313F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA4,467$5K<0.01%-527,82613F-HRTimelineGroup
MTM Investment Management, LLC4,125$4.54K<0.01%013F-HRTimeline
N.E.W. Advisory Services LLC3,854$4.24K<0.01%013F-HRTimeline
GF FUND MANAGEMENT CO. LTD.3,723$4.09K<0.01%new13F-HRTimeline
PINNEY & SCOFIELD, INC.3,680$4.05K<0.01%013F-HRTimeline
FNY Investment Advisers, LLC4,000$4K<0.01%new13F-HRTimeline
Archer Investment Corp2,000$2.2K<0.01%013F-HRTimeline
Sound Income Strategies, LLC1,000$1.27K<0.01%new13F-HRTimeline
Signature Resources Capital Management,…1,000$1.1K<0.01%new13F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.927$1.02K<0.01%-19113F-HRTimelineGroup
TD Waterhouse Canada Inc.800$872<0.01%013F-HRTimeline
NISA INVESTMENT ADVISORS, LLC608$669<0.01%013F-HRTimeline
Medallion Wealth Advisors, LLC470$517<0.01%+22813F-HRTimeline
Allworth Financial LP436$480<0.01%-41513F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…427$470<0.01%013F-HRTimelineGroup
United Financial Planning Group LLC200$220<0.01%new13F-HRTimeline
ROTHSCHILD INVESTMENT LLC70$77<0.01%new13F-HRTimeline
Walleye Capital LLCin group Walleye Capital LLC58$64<0.01%new13F-HRTimelineGroup
Federation des caisses Desjardins du Qu…50$55<0.01%013F-HRTimeline
SageView Advisory Group, LLC17$19<0.01%new13F-HRTimeline
Capital Advisors, Ltd. LLC58$00%013F-HRTimelineValue filed as zero, left out of ratios.