QUMSU · 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 QUMSU 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 QUMSU
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) | 188,842 | — |
| 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 QUMSU
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
GABELLI & Co INVESTMENT ADVISERS, INC.
13F
CIK 932724 · Registered investment adviser · Jun 30, 2026
|
67,700 | ||
| 2 |
GABELLI FUNDS LLC
13F
CIK 1081407 · Registered investment adviser · Jun 30, 2026
|
57,300 | ||
| 3 |
HRT FINANCIAL LP
13F
CIK 1475597 · Unknown · Jun 30, 2026
|
30,000 | ||
| 4 |
Clear Street Group Inc.
13F
CIK 1881567 · Unknown · Jun 30, 2026
|
23,142 | ||
| 5 |
JPMORGAN CHASE & CO
13F
CIK 19617 · Bank · Jun 30, 2026
|
10,000 | ||
| 6 |
UBS Group AG
13F
CIK 1610520 · Bank · Jun 30, 2026
|
479 | ||
| 7 |
GLAZER CAPITAL, LLC
13F
CIK 1076809 · Registered investment adviser · Jun 30, 2026
|
221 |
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.