QUMSR · Quantumsphere Acquisition Corp · Shareholders & Ownership
Substantial doubt about the company's ability to continue as a going concern.
“The Company lacks the financial resources it needs to sustain operations for a reasonable period of time, which is considered to be one year from the date of the issuance of the financial statements. Therefore, management has determined that these conditions raise substantial doubt about the Company's ability to continue as a going concern until the earlier of the consummation of the Business Combination or the date the Company is required to liquidate.”View the 10-Q filed Aug 14, 2026
Every disclosed holder of QUMSR in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns QUMSR
13F quarter Jun 30, 2026; this listing alone: insiders and shares outstanding are issuer-wide, so they are left outNo chart: shares outstanding cannot be set against these holders.
| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 6,536,098 | — |
| Insiders (Forms 3, 4, 5) | 0 | — |
| 13D/G-only blocks | 0 | — |
| Registered funds (N-PORT, not summed) | 0 | — |
% Out is unavailable: shares outstanding is an issuer-wide count, not one listing's.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of QUMSR
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
Harraden Circle Investments, LLC
13F
CIK 1910592 · Registered investment adviser · Jun 30, 2026
|
993,926 | ||
| 2 |
TORONTO DOMINION BANK
13F
CIK 947263 · Bank · Jun 30, 2026
|
717,905 | ||
| 3 |
Shaolin Capital Management LLC
13F
CIK 1766806 · Registered investment adviser · Jun 30, 2026
|
479,379 | ||
| 4 |
RIVERNORTH CAPITAL MANAGEMENT, LLC
13F
CIK 1447578 · Registered investment adviser · Jun 30, 2026
|
424,512 | ||
| 5 |
GLAZER CAPITAL, LLC
13F
CIK 1076809 · Registered investment adviser · Jun 30, 2026
|
420,536 | ||
| 6 |
Linden Advisors LP
13F
CIK 1279396 · Registered investment adviser · Jun 30, 2026
|
400,000 | ||
| 7 |
Polar Asset Management Partners Inc.
13F
CIK 1326389 · Registered investment adviser · Jun 30, 2026
|
400,000 | ||
| 8 |
AQR Arbitrage LLC
13F
CIK 1167456 · Registered investment adviser · Jun 30, 2026
|
324,248 | ||
| 9 |
HIGHBRIDGE CAPITAL MANAGEMENT LLC
13F
CIK 919185 · Registered investment adviser · Jun 30, 2026
|
307,316 | ||
| 10 |
HGC Investment Management Inc.
13F
CIK 1711200 · Non-US institution · Jun 30, 2026
|
300,000 | ||
| 11 |
Clear Street Group Inc.
13F
CIK 1881567 · Unknown · Jun 30, 2026
|
222,380 | ||
| 12 |
RLH Capital LLC
13F
CIK 2008031 · Unknown · Jun 30, 2026
|
184,900 | ||
| 13 |
Cable Car Capital, LP
13F
CIK 1699575 · Registered investment adviser · Jun 30, 2026
|
174,801 | ||
| 14 |
Hudson Bay Capital Management LP
13F
CIK 1393825 · Registered investment adviser · Jun 30, 2026
|
150,000 | ||
| 15 |
Radcliffe Capital Management, L.P.
13F
CIK 1218275 · Registered investment adviser · Jun 30, 2026
|
150,000 | ||
| 16 |
WOLVERINE ASSET MANAGEMENT LLC
13F
CIK 1279891 · Registered investment adviser · Jun 30, 2026
|
132,552 | ||
| 17 |
D. E. Shaw & Co., Inc.
13F
CIK 1009207 · Unknown · Jun 30, 2026
|
125,000 | ||
| 18 |
Periscope Capital Inc.
13F
CIK 1695320 · Exempt reporting adviser · Jun 30, 2026
|
125,000 | ||
| 19 |
HEIGHTS CAPITAL MANAGEMENT, INC
13F
CIK 1081698 · Unknown · Jun 30, 2026
|
106,968 | ||
| 20 |
BNP PARIBAS ARBITRAGE, SA
13F
CIK 1166588 · Non-US institution · Jun 30, 2026
|
102,340 | ||
| 21 |
BOOTHBAY FUND MANAGEMENT, LLC
13F
CIK 1549230 · Registered investment adviser · Jun 30, 2026
|
100,000 | ||
| 22 |
Westchester Capital Management, LLC
13F
CIK 1512805 · Registered investment adviser · Jun 30, 2026
|
100,000 | ||
| 23 |
Schonfeld Strategic Advisors LLC
13F
CIK 1665241 · Registered investment adviser · Jun 30, 2026
|
54,200 | ||
| 24 |
BERKLEY W R CORP
13F
CIK 11544 · Insurance company · Jun 30, 2026
|
24,108 | ||
| 25 |
UBS Group AG
13F
CIK 1610520 · Bank · Jun 30, 2026
|
16,027 |
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.