Security key
G7387B122
Quantumsphere Acquisition Corp - UNIT 07/30/2030 (QUMSU)
CUSIP: G7387B122
Q4 2025 13F Holders as of 31 Dec 2025
- Security type / class
- Equity / UNIT 07/30/2030
- Total 13F shares
- 1,105,926
- Total 13F value
- $11,257,841
- Share change
- -4,290,141
- SEC-reported 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
Ownership snapshot
Full 13F holder table
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:
Ownership snapshot
Top reported holders of QUMSU - Quantumsphere Acquisition Corp - UNIT 07/30/2030 (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Whiteowl Holdings LLC
Disclosed value leader
MIZUHO FINANCIAL GROUP INC
Comparable rows
4/15
Latest evidence
31 Dec 2025
3/4/5
13D/G
13F
Lead comparable stake: 27%
11 rows are not safely comparable across share classes.
13D/G row: Whiteowl Holdings LLC
Showing 1-6 of 15 holder rows.
Quick read
Whiteowl Holdings LLC leads the comparable SEC ownership view at 27%.
4 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Whiteowl Holdings LLC's linked filing trail.
Comparable ownership
Top 4
Whiteowl Holdings LLC
27%
MIZUHO FINANCIAL GROUP INC
6.3%
WOLVERINE ASSET MANAGEMENT LLC
5%
Virtu Financial LLC
0.13%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Whiteowl Holdings LLC |
3/4/5
13D/G
10%+ Owner
|
27%
from 13D/G
|
—
3,126,650 shares
|
— | 05 Aug 2025 |
| MIZUHO FINANCIAL GROUP INC |
13D/G
|
6.3%
|
$7,188,041
718,086 shares
|
$0 | 31 Dec 2025 |
| WOLVERINE ASSET MANAGEMENT LLC |
13F
13D/G
Company
|
5%
from 13D/G
|
$1,519,500
150,000 shares
|
— | 30 Sep 2025 |
| Virtu Financial LLC |
13F
Company
|
0.13%
|
$149,000
14,934 shares
|
— | 30 Sep 2025 |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC |
13F
Company
|
—
mixed-class rows
|
$6,109,000
1,300,000 shares
mixed-class rows
|
— | 30 Sep 2025 |
| RIVERNORTH CAPITAL MANAGEMENT, LLC |
13F
Company
|
—
class O/S missing
|
$4,305,250
425,000 shares
|
— | 30 Sep 2025 |
How to read this table
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.
13F holder rows
Institutional holders as of Q4 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
9
Shares
1,105,926
Rows available
9
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
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 change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend