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Disclosery

QSI QUANTUM SI INC

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COM CL A (common), issuer CIK 1816431

123 managers (125 13F filers) reported a position in QSI shares at 2025-09-30, 64,631,881 shares in all. 13 filers opened a position and 22 filers sold out during the quarter.

Managers
123
13F filers
125
New
13
Added
43
Reduced
40
Sold out
22
Shares held by filers
64,631,881

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, Q3 2025

Filers in the available 13F reports with a share position at 2025-09-30, 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.11,321,673$16M<0.01%+473,53113F-HRTimelineGroup
VANGUARD GROUP INCgroup of 2 filers holding8,739,700$12.3M+45,948Timeline
ARK Investment Management LLCin group ARK Investment Management LLC7,624,042$10.7M0.06%-336,69413F-HRTimelineGroup
Sumitomo Mitsui Trust Group, Inc.in group Sumitomo Mitsui Trust Group, …5,217,499$7.36M<0.01%-403,80413F-HRTimelineGroup
Amova Asset Management Americas, Inc.in group Amova Asset Management Americ…5,217,499$7.36M0.07%-403,80413F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC3,747,169$5.28M<0.01%+299,43113F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP2,817,490$3.97M<0.01%+61,05313F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC2,669,959$3.76M<0.01%-1,109,30013F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP2,323,042$3.28M<0.01%+33,58613F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…2,041,095$2.88M<0.01%+1,055,01113F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC1,610,023$2.27M<0.01%+1,325,27013F-HRTimelineGroup
Fosun International Ltd743,935$1.05M0.39%013F-HRTimeline
Squarepoint Ops LLCin group Squarepoint Ops LLC613,475$865K<0.01%new13F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA532,293$750K<0.01%+72,00413F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP515,852$727K<0.01%-48,59013F-HRTimelineGroup
UBS Group AGin group UBS Group AG504,859$712K<0.01%-284,71113F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co468,088$660K<0.01%+36,64113F-HRTimelineGroup
Nuveen, LLCin group TIAA447,519$631K<0.01%-678,56513F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC407,047$574K<0.01%-151,26013F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp394,905$557K<0.01%+42,17313F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC387,151$546K<0.01%-506,94913F-HRTimelineGroup
GROUP ONE TRADING LLC377,774$533K0.02%+243,14213F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/348,007$491K<0.01%-117,99213F-HR/ATimelineGroup
Knollwood Investment Advisory, LLC300,000$423K0.04%013F-HRTimeline
Invesco Ltd.in group Invesco Ltd.295,728$417K<0.01%+100,27813F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.272,180$384K<0.01%013F-HRTimeline
Verdence Capital Advisors LLC163,830$383K0.02%new13F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY271,000$382K<0.01%-18,91313F-HR/ATimelineGroup
BRIDGEWAY CAPITAL MANAGEMENT, LLC261,100$368K0.01%+65,00013F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC221,210$312K<0.01%-17,79113F-HR/ATimelineGroup
RHUMBLINE ADVISERS219,965$310K<0.01%+15,99813F-HRTimeline
Green Alpha Advisors, LLC216,032$305K0.29%-12,31613F-HRTimeline
IQ EQ FUND MANAGEMENT (IRELAND) Ltd189,174$267K0.02%+72,34613F-HRTimeline
IMC-Chicago, LLC185,117$261K<0.01%new13F-HRTimeline
Pathstone Holdings, LLCin group Pathstone Holdings, LLC183,934$259K<0.01%-14,86413F-HRTimelineGroup
SUMMIT WEALTH GROUP LLC / CO2,330$225K0.02%new13F-HRTimeline
Shay Capital LLC154,572$218K0.04%+24,94113F-HRTimeline
SIMPLEX TRADING, LLC154,083$217K<0.01%+48,54913F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd150,532$212K0.01%+104,05813F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN135,950$192K<0.01%+34,23413F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\112,084$158K<0.01%+13,55213F-HRTimelineGroup
AlphaCore Capital LLC102,850$145K<0.01%+18,90013F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP93,500$139K<0.01%+46,60013F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/92,034$130K<0.01%-28,47213F-HRTimeline
FMR LLCin group FMR LLC90,520$128K<0.01%+72,00013F-HRTimelineGroup
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC83,824$118K<0.01%-37,87913F-HRTimelineGroup
INTECH INVESTMENT MANAGEMENT LLC74,761$105K<0.01%-13,73613F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…72,976$103K<0.01%-4,23913F-HRTimelineGroup
MetLife Investment Management, LLCin group MetLife Investment Management…64,568$91K<0.01%-12,74813F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO63,280$89.2K<0.01%-3,37613F-HR/ATimelineGroup
Caitong International Asset Management …59,774$84.3K0.06%new13F-HRTimeline
Mariner, LLCin group Mariner, LLC50,529$71.2K<0.01%-6513F-HRTimelineGroup
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …47,666$67.2K<0.01%-1,41613F-HRTimelineGroup
Police & Firemen's Retirement System of…46,170$65.1K<0.01%+15,03613F-HRTimeline
SG Americas Securities, LLC42,107$59K<0.01%+9,92613F-HRTimeline
Engineers Gate Manager LP41,451$58.4K<0.01%new13F-HRTimeline
Cambridge Investment Research Advisors,…38,867$55K<0.01%013F-HRTimeline
Elite Life Management LLC20,611$54.2K0.11%new13F-HRTimeline
Red Wave Investments LLC37,000$52.2K0.02%013F-HRTimeline
Sanctuary Advisors, LLC36,516$51.5K<0.01%+17913F-HR/ATimeline
COMMONWEALTH EQUITY SERVICES, LLC36,179$51K<0.01%+10,66413F-HRTimeline
HOLLENCREST CAPITAL MANAGEMENT35,000$49.4K<0.01%+10,00013F-HRTimeline
CAPTRUST FINANCIAL ADVISORS34,828$49.1K<0.01%+51813F-HRTimeline
JTC Employer Solutions Trustee Ltd34,540$49K<0.01%+21,20013F-HRTimeline
SBI Securities Co., Ltd.33,616$47.4K<0.01%+7,47513F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO33,103$46.7K<0.01%013F-HRTimelineGroup
WOLVERINE TRADING, LLC33,034$45.9K<0.01%-7,39113F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…32,006$45.1K<0.01%+2,10513F-HRTimelineGroup
Wealth Management Associates, Inc.30,950$43.6K0.02%+4,00013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS30,464$43K<0.01%+15,33113F-HRTimelineGroup
LPL Financial LLC28,460$40.1K<0.01%+5,17013F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC27,246$38.4K<0.01%-11,61713F-HRTimelineGroup
MERCER GLOBAL ADVISORS INC /ADV26,989$38.1K<0.01%+1,72913F-HRTimeline
ProShare Advisors LLC26,860$37.9K<0.01%-2,06413F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND26,084$36.8K<0.01%013F-HRTimeline
Leonteq Securities AG25,000$35.2K<0.01%013F-HRTimeline
HBW ADVISORY SERVICES LLC24,243$34.2K<0.01%-1013F-HRTimeline
CITIGROUP INCin group CITIGROUP INC23,673$33.4K<0.01%-25,43413F-HRTimelineGroup
Capital Investment Advisory Services, L…20,000$28.2K<0.01%+10,00013F-HRTimeline
Balyasny Asset Management L.P.in group Balyasny Asset Management19,802$27.9K<0.01%new13F-HRTimelineGroup
DLK Investment Management, LLC19,750$27.8K0.01%013F-HRTimeline
PRINCIPAL FINANCIAL GROUP INCgroup of 2 filers holding17,797$25.1K+11,156Timeline
VICTORY CAPITAL MANAGEMENT INC17,476$24.6K<0.01%+1,25913F-HRTimeline
EWA, LLC17,119$24.1K0.01%-51,08113F-HRTimeline
CIBC Bancorp USA Inc.in group CIBC Bancorp USA Inc.16,745$23.6K<0.01%13F-HR/ATimelineGroup
Jump Financial, LLCin group Jump Financial, LLC15,100$21.3K<0.01%new13F-HR/ATimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…14,661$20.7K<0.01%-24613F-HRTimelineGroup
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…14,401$20.3K<0.01%013F-HRTimelineGroup
Flagship Private Wealth, LLC14,158$20K0.01%013F-HRTimeline
CIBC WORLD MARKET INC.14,000$19.7K<0.01%-1113F-HRTimeline
Procyon Advisors, LLC13,671$19.3K<0.01%013F-HRTimeline
Stratos Wealth Advisors, LLCin group Stratos Wealth Partners, LTD.13,536$19.1K<0.01%-4,32413F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc12,860$18.1K<0.01%013F-HRTimelineGroup
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC12,850$18.1K<0.01%013F-HRTimelineGroup
XPONANCE LLC11,952$16.9K<0.01%+90113F-HRTimeline
Sterling Capital Management LLC10,839$15.3K<0.01%+7,44413F-HRTimeline
MARK SHEPTOFF FINANCIAL PLANNING, LLC10,500$14.8K0.01%-4,00013F-HRTimeline
NewEdge Advisors, LLC10,170$14.3K<0.01%-8013F-HRTimeline
Kestra Advisory Services, LLCin group Kestra Advisory Services, LLC10,090$14.2K<0.01%-4213F-HRTimelineGroup
TriaGen Wealth Management LLC10,000$14.1K<0.01%013F-HRTimeline
Glen Eagle Advisors, LLC10,000$14.1K<0.01%013F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…8,807$12.4K<0.01%+613F-HRTimeline
WOLVERINE ASSET MANAGEMENT LLCin group WOLVERINE ASSET MANAGEMENT LLC7,825$11K<0.01%-8,67613F-HRTimelineGroup
AMALGAMATED BANK4,142$6K<0.01%013F-HRTimeline
MTM Investment Management, LLC4,125$5.82K<0.01%013F-HRTimeline
N.E.W. Advisory Services LLC3,854$5.43K<0.01%013F-HRTimeline
PINNEY & SCOFIELD, INC.3,680$5.19K<0.01%013F-HRTimeline
CWM, LLCin group CWM, LLC2,156$3K<0.01%-6,75513F-HRTimelineGroup
Archer Investment Corp2,000$2.82K<0.01%013F-HRTimeline
Belvedere Trading LLC1,390$1.96K<0.01%-5,83213F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.1,118$1.58K<0.01%new13F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.1,220$1.42K<0.01%-3813F-HRTimelineGroup
Allworth Financial LP851$1.2K<0.01%+1513F-HRTimeline
TD Waterhouse Canada Inc.800$1.17K<0.01%013F-HRTimeline
NISA INVESTMENT ADVISORS, LLC608$857<0.01%-71613F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…427$602<0.01%-40113F-HRTimelineGroup
Bangor Savings Bank400$564<0.01%013F-HRTimeline
Atlantic Union Bankshares Corpin group Atlantic Union Bankshares Corp251$354<0.01%new13F-HRTimelineGroup
Medallion Wealth Advisors, LLC242$341<0.01%013F-HRTimeline
Arax Advisory Partners104$146<0.01%new13F-HRTimeline
FSA Wealth Management LLC100$141<0.01%013F-HRTimeline
Federation des caisses Desjardins du Qu…50$71<0.01%013F-HRTimeline
Capital Advisors, Ltd. LLC58$00%013F-HRTimelineValue filed as zero, left out of ratios.