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QUMSR QUANTUMSPHERE ACQUISITION CO

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

25 managers (25 13F filers) reported a position in QUMSR shares at 2026-06-30, 6,536,098 shares in all. 1 filer opened a position and 0 filers sold out during the quarter.

Managers
25
13F filers
25
New
1
Added
3
Reduced
6
Sold out
0
Shares held by filers
6,536,098

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
Harraden Circle Investments, LLC993,926$198K0.03%013F-HRTimeline
TORONTO DOMINION BANKin group TORONTO DOMINION BANK717,905$143K<0.01%+47,06813F-HRTimelineGroup
Shaolin Capital Management LLC479,379$95.4K0.01%+19,37913F-HRTimeline
GLAZER CAPITAL, LLCin group GLAZER CAPITAL, LLC420,536$68K<0.01%013F-HRTimelineGroup
RIVERNORTH CAPITAL MANAGEMENT, LLC424,512$65.8K<0.01%013F-HRTimeline
AQR Arbitrage LLCin group AQR CAPITAL MANAGEMENT LLC324,248$64.5K<0.01%+3,24613F-HRTimelineGroup
Linden Advisors LPin group Linden Advisors LP400,000$64.3K<0.01%013F-HRTimelineGroup
Polar Asset Management Partners Inc.400,000$64.3K<0.01%013F-HRTimeline
HGC Investment Management Inc.300,000$59.7K0.01%013F-HRTimeline
HIGHBRIDGE CAPITAL MANAGEMENT LLC307,316$52.2K<0.01%-383,08813F-HRTimeline
Clear Street Group Inc.in group Clear Street Group Inc.222,380$44.3K<0.01%-2,00013F-HRTimelineGroup
Cable Car Capital, LP174,801$34.8K<0.01%013F-HRTimeline
RLH Capital LLC184,900$29.7K0.01%013F-HRTimeline
WOLVERINE ASSET MANAGEMENT LLCin group WOLVERINE ASSET MANAGEMENT LLC132,552$26.4K<0.01%-2,66113F-HRTimelineGroup
Hudson Bay Capital Management LPin group Hudson Bay Capital Management…150,000$25.5K<0.01%013F-HRTimelineGroup
Radcliffe Capital Management, L.P.150,000$24.1K<0.01%013F-HRTimeline
HEIGHTS CAPITAL MANAGEMENT, INCin group HEIGHTS CAPITAL MANAGEMENT, I…106,968$21.3K<0.01%-31,21313F-HRTimelineGroup
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.125,000$21.2K<0.01%013F-HRTimelineGroup
Periscope Capital Inc.125,000$20.1K<0.01%013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS102,340$16.4K<0.01%013F-HRTimelineGroup
BOOTHBAY FUND MANAGEMENT, LLC100,000$16.1K<0.01%013F-HRTimeline
Westchester Capital Management, LLCin group Westchester Capital Managemen…100,000$12.2K<0.01%new13F-HRTimelineGroup
Schonfeld Strategic Advisors LLC54,200$8.71K<0.01%-30013F-HRTimeline
BERKLEY W R CORP24,108$3.87K<0.01%-11,00213F-HRTimeline
UBS Group AGin group UBS Group AG16,027$1.96K<0.01%013F-HRTimelineGroup