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QUMSR QUANTUMSPHERE ACQUISITION CO

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RIGHT 08/06/2030 (warrant or right), issuer CIK 2070900

24 managers (24 13F filers) reported a position in QUMSR shares at 2026-03-31, 6,796,669 shares in all. 2 filers opened a position and 2 filers sold out during the quarter.

Managers
24
13F filers
24
New
2
Added
1
Reduced
7
Sold out
2
Shares held by filers
6,796,669

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, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, 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
Harraden Circle Investments, LLCin group Harraden Circle Investments, …993,926$248K0.05%013F-HRTimelineGroup
HIGHBRIDGE CAPITAL MANAGEMENT LLC690,404$173K0.01%+6,36713F-HRTimeline
TORONTO DOMINION BANKin group TORONTO DOMINION BANK670,837$168K<0.01%-24,30013F-HRTimelineGroup
Shaolin Capital Management LLC460,000$115K<0.01%013F-HRTimeline
RIVERNORTH CAPITAL MANAGEMENT, LLC424,512$106K0.01%new13F-HRTimeline
Polar Asset Management Partners Inc.400,000$100K<0.01%new13F-HRTimeline
Linden Advisors LPin group Linden Advisors LP400,000$90K<0.01%013F-HRTimelineGroup
AQR Arbitrage LLCin group AQR CAPITAL MANAGEMENT LLC321,002$80.3K<0.01%-1,65813F-HRTimelineGroup
HGC Investment Management Inc.300,000$75K0.02%013F-HRTimeline
GLAZER CAPITAL, LLCin group GLAZER CAPITAL, LLC420,536$67K<0.01%013F-HRTimelineGroup
Clear Street Group Inc.in group Clear Street Group Inc.224,380$56.1K<0.01%-4,87213F-HRTimelineGroup
Cable Car Capital, LP174,801$43.7K0.02%013F-HRTimeline
RLH Capital LLC184,900$40.7K0.02%13F-HRTimeline
Hudson Bay Capital Management LPin group Hudson Bay Capital Management…150,000$37.5K<0.01%013F-HRTimelineGroup
HEIGHTS CAPITAL MANAGEMENT, INCin group HEIGHTS CAPITAL MANAGEMENT, I…138,181$34.5K0.01%-11,71913F-HRTimelineGroup
WOLVERINE ASSET MANAGEMENT LLCin group WOLVERINE ASSET MANAGEMENT LLC135,213$33.8K<0.01%-14,78713F-HRTimelineGroup
Radcliffe Capital Management, L.P.150,000$33K<0.01%013F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.125,000$31.2K<0.01%013F-HRTimelineGroup
Periscope Capital Inc.125,000$27.5K<0.01%013F-HRTimeline
BOOTHBAY FUND MANAGEMENT, LLC100,000$25K<0.01%013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS102,340$22.5K<0.01%013F-HRTimelineGroup
Schonfeld Strategic Advisors LLC54,500$12K<0.01%-9913F-HRTimeline
BERKLEY W R CORP35,110$7.73K<0.01%013F-HRTimeline
UBS Group AGin group UBS Group AG16,027$2.56K<0.01%-7713F-HRTimelineGroup