Security key
G7387B114
Quantumsphere Acquisition Corp - RIGHT 08/06/2030 (QUMSR)
CUSIP: G7387B114
Q1 2026 13F Holders as of 31 Mar 2026
- Security type / class
- Equity / RIGHT 08/06/2030
- Total 13F shares
- 6,796,669
- Total 13F value
- $1,630,062
- Share change
- +737,146
- SEC-reported price per share
- $0.25
- Number of holders
- 24
- Value change
- +$185,741
- Number of buys
- 3
- Number of sells
- 9
Report period
Q1 2026
Institutions
24
Top holders
10
QUMSR full security history
Ownership snapshot
Full 13F holder table
Previous quarter: Q4 2025
Quantumsphere Acquisition Corp SEC filings
Quantumsphere Acquisition Corp company facts
Broader feeds
Reporting periods
Holder history for CUSIP G7387B114
Recent filing periods:
Ownership snapshot
Top reported holders of QUMSR - Quantumsphere Acquisition Corp - RIGHT 08/06/2030 (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
10/15
Latest evidence
31 Dec 2025
3/4/5
13D/G
13F
Lead comparable stake: 27%
5 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%.
10 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 5
Whiteowl Holdings LLC
27%
MIZUHO FINANCIAL GROUP INC
6.3%
WOLVERINE ASSET MANAGEMENT LLC
5%
MIZUHO SECURITIES USA LLC
6.3%
Karpus Management, Inc.
4.3%
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
|
$5,789,487
725,222 shares
mixed-class rows
|
— | 31 Dec 2025 |
| MIZUHO SECURITIES USA LLC |
13F
Company
|
6.3%
|
$7,128,939
718,086 shares
|
— | 31 Dec 2025 |
| Karpus Management, Inc. |
13F
Company
|
4.3%
|
$4,948,444
494,350 shares
|
— | 31 Dec 2025 |
| TWO SIGMA INVESTMENTS, LP |
13F
Company
|
1.9%
|
$2,176,965
217,479 shares
|
— | 31 Dec 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 Q1 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
24
Shares
6,796,669
Rows available
24
| 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 Q1 2026 vs Q4 2025 Across Filers
Q4 2025 holders
23
Q1 2026 holders
24
Holder diff
1
| Investor | Q4 2025 Shares | Q1 2026 Shares | Share Diff | Share Chg % | Q4 2025 value | Q1 2026 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend