Security key
G7387B122
Quantumsphere Acquisition Corp - UNIT 07/30/2030 (QUMSU)
CUSIP: G7387B122
Q4 2025 13F Holders as of 31 Dec 2025
- Type / Class
- Equity / UNIT 07/30/2030
- Total 13F shares
- 1,105,926
- Share change
- -4,290,141
- Total reported value
- $11,257,841
- Price per share
- $10.18
- Number of holders
- 9
- Value change
- -$43,469,163
- Number of buys
- 2
- Number of sells
- 22
Report period
Q4 2025
Institutions
9
Top holders
9
QUMSU full security history
Newer quarter: Q1 2026
Previous quarter: Q3 2025
Quantumsphere Acquisition Corp SEC filings
Quantumsphere Acquisition Corp company facts
Broader feeds
Reporting periods
Holder history for CUSIP G7387B122
Recent filing periods:
Top shareholders of QUMSU - Quantumsphere Acquisition Corp - UNIT 07/30/2030 (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| Whiteowl Holdings LLC |
3/4/5
13D/G
|
10%+ Owner |
27%
from 13D/G
|
3,126,650
|
— | — | 05 Aug 2025 | |
| MIZUHO FINANCIAL GROUP INC |
13D/G
|
— |
6.3%
|
718,086
|
$7,188,041 | $0 | 31 Dec 2025 | |
| WOLVERINE ASSET MANAGEMENT LLC |
13F
13D/G
|
Company |
5%
from 13D/G
|
150,000
|
$1,519,500 | — | 30 Sep 2025 | |
| Virtu Financial LLC |
13F
|
Company |
0.13%
|
14,934
|
$149,000 | — | 30 Sep 2025 | |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC |
13F
|
Company |
—
mixed-class rows
|
1,300,000
mixed-class rows
|
$6,109,000 | — | 30 Sep 2025 | |
| RIVERNORTH CAPITAL MANAGEMENT, LLC |
13F
|
Company |
—
class O/S missing
|
425,000
|
$4,305,250 | — | 30 Sep 2025 | |
| GLAZER CAPITAL, LLC |
13F
|
Company |
—
class O/S missing
|
420,542
|
$4,260,000 | — | 30 Sep 2025 | |
| Harraden Circle Investments, LLC |
13F
|
Company |
—
mixed-class rows
|
568,207
mixed-class rows
|
$4,090,987 | — | 30 Sep 2025 | |
| LINDEN ADVISORS LP |
13F
|
Company |
—
class O/S missing
|
400,000
|
$4,052,000 | — | 30 Sep 2025 | |
| Polar Asset Management Partners Inc. |
13F
|
Company |
—
class O/S missing
|
400,000
|
$4,052,000 | — | 30 Sep 2025 | |
| TORONTO DOMINION BANK |
13F
|
Company |
—
mixed-class rows
|
411,000
mixed-class rows
|
$3,671,430 | — | 30 Sep 2025 | |
| AQR Arbitrage LLC |
13F
|
Company |
—
class O/S missing
|
322,660
|
$3,268,546 | — | 30 Sep 2025 | |
| HGC Investment Management Inc. |
13F
|
Company |
—
class O/S missing
|
300,000
|
$3,039,000 | — | 30 Sep 2025 | |
| Hudson Bay Capital Management LP |
13F
|
Company |
—
mixed-class rows
|
470,000
mixed-class rows
|
$2,385,250 | — | 30 Sep 2025 | |
| METEORA CAPITAL, LLC |
13F
|
Company |
—
class O/S missing
|
229,999
|
$2,329,890 | — | 30 Sep 2025 | |
| TWO SIGMA INVESTMENTS, LP |
13F
|
Company |
—
class O/S missing
|
222,490
|
$2,253,824 | — | 30 Sep 2025 | |
| Clear Street Group Inc. |
13F
|
Company |
—
mixed-class rows
|
219,456
mixed-class rows
|
$2,222,851 | — | 30 Sep 2025 | |
| Cable Car Capital, LP |
13F
|
Company |
—
class O/S missing
|
174,801
|
$1,770,734 | — | 30 Sep 2025 | |
| StoneX Group Inc. |
13F
|
Company |
—
class O/S missing
|
168,149
|
$1,703,349 | — | 30 Sep 2025 | |
| HEIGHTS CAPITAL MANAGEMENT, INC |
13F
|
Company |
—
class O/S missing
|
150,000
|
$1,519,500 | — | 30 Sep 2025 | |
| Radcliffe Capital Management, L.P. |
13F
|
Company |
—
class O/S missing
|
150,000
|
$1,519,500 | — | 30 Sep 2025 | |
| BERKLEY W R CORP |
13F
|
Company |
—
class O/S missing
|
148,770
|
$1,507,040 | — | 30 Sep 2025 | |
| D. E. Shaw & Co., Inc. |
13F
|
Company |
—
class O/S missing
|
125,000
|
$1,266,250 | — | 30 Sep 2025 | |
| PERISCOPE CAPITAL INC. |
13F
|
Company |
—
class O/S missing
|
125,000
|
$1,266,250 | — | 30 Sep 2025 | |
| BNP PARIBAS FINANCIAL MARKETS |
13F
|
Company |
—
class O/S missing
|
102,340
|
$1,036,704 | — | 30 Sep 2025 | |
| ATW SPAC MANAGEMENT LLC |
13F
|
Company |
—
class O/S missing
|
100,000
|
$1,013,000 | — | 30 Sep 2025 | |
| BOOTHBAY FUND MANAGEMENT, LLC |
13F
|
Company |
—
class O/S missing
|
100,000
|
$1,013,000 | — | 30 Sep 2025 | |
| Westchester Capital Management, LLC |
13F
|
Company |
—
class O/S missing
|
100,000
|
$1,013,000 | — | 30 Sep 2025 | |
| Schonfeld Strategic Advisors LLC |
13F
|
Company |
—
class O/S missing
|
87,486
|
$886,233 | — | 30 Sep 2025 | |
| GABELLI & Co INVESTMENT ADVISERS, INC. |
13F
|
Company |
—
class O/S missing
|
67,700
|
$685,801 | — | 30 Sep 2025 | |
| GABELLI FUNDS LLC |
13F
|
Company |
—
class O/S missing
|
57,300
|
$580,449 | — | 30 Sep 2025 | |
| Warberg Asset Management LLC |
13F
|
Company |
—
class O/S missing
|
41,421
|
$419,595 | — | 30 Sep 2025 | |
| HRT FINANCIAL LP |
13F
|
Company |
—
class O/S missing
|
29,985
|
$303,000 | — | 30 Sep 2025 | |
| JPMORGAN CHASE & CO |
13F
|
Company |
—
class O/S missing
|
10,000
|
$101,300 | — | 30 Sep 2025 | |
| TrueMark Investments, LLC |
13F
|
Company |
—
class O/S missing
|
10,000
|
$101,300 | — | 30 Sep 2025 | |
| MIZUHO SECURITIES USA LLC |
13F
|
Company |
—
class O/S missing
|
357,801
|
$6,142 | — | 30 Sep 2025 | |
| Ping Zhang |
3/4/5
|
Chairman, CEO, and CFO, Director |
—
class O/S missing
|
3,126,650
|
— | — | 05 Aug 2025 |
Institutional Holders of Quantumsphere Acquisition Corp - UNIT 07/30/2030 (QUMSU) as of Q4 2025
As of 31 Dec 2025,
Quantumsphere Acquisition Corp - UNIT 07/30/2030 (QUMSU) was held by
9 institutional
shareholders
that filed Form 13F with the SEC.
Together, they reported ownership of
1,105,926 shares.
The largest 9 holders included
RIVERNORTH CAPITAL MANAGEMENT, LLC, Polar Asset Management Partners Inc., Westchester Capital Management, LLC, GABELLI & Co INVESTMENT ADVISERS, INC., GABELLI FUNDS LLC, HRT FINANCIAL LP, Clear Street Group Inc., JPMORGAN CHASE & CO, and UBS Group AG.
This page lists
9
institutional shareholders reporting positions in this security
for the Q4 2025 filing period.
| Investor | Option | Weight % | Change % | Value $ | * Price | Shares | Share Change | Activity | Report Period |
|---|
Compare Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
31
Q4 2025 holders
9
Holder diff
-22
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 Value $ | Q4 2025 Value $ | Value Diff $ | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend
* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.
An asterisk sign (*) next to the price indicates that the price is likely invalid.