Latest Period
Q4 2025
Security Snapshot
Quantumsphere Acquisition Corp - Ordinary Shares, par value $0.0001 per share (QUMS) Institutional Ownership
CUSIP: G7387B106
13F Institutional Holders and Ownership History from Q3 2025 to Q1 2026
Institutions Reporting
25
Shares (Excl. Options)
6,568,805
Price
$10.01
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- Type / Class
- Equity / Ordinary Shares, par value $0.0001 per share
- Symbol
- QUMS on Nasdaq
- Shares outstanding
- 11,398,190
- Price per share
- $10.12
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 6,568,805
- Total reported value
- $65,694,789
- % of total 13F portfolios
- 0%
- Share change
- +5,615,132
- Value change
- +$56,178,570
- Number of holders
- 25
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- QUMS - Quantumsphere Acquisition Corp - Ordinary Shares, par value $0.0001 per share is tracked under CUSIP G7387B106.
- 25 institutions reported positions in Q4 2025.
- 3 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 25 to 2 between Q4 2025 and Q1 2026.
- Reported value moved from $65,694,789 to $7,124,318.
Why This Matters
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 25 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP G7387B106?
CUSIP G7387B106 identifies QUMS - Quantumsphere Acquisition Corp - Ordinary Shares, par value $0.0001 per share in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP G7387B106:
Significant Owners of Quantumsphere Acquisition Corp - Ordinary Shares, par value $0.0001 per share (QUMS) based on Schedule 13D/G filings
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Whiteowl Holdings LLC | 27% | 3,126,650 | Whiteowl Holdings LLC | 05 Aug 2025 | ||||
| MIZUHO FINANCIAL GROUP INC | 6.3% | $7,188,041 | 718,086 | Mizuho Financial Group, Inc. | 31 Dec 2025 | |||
| WOLVERINE ASSET MANAGEMENT LLC | 5% | 574,171 | WOLVERINE ASSET MANAGEMENT LLC | 31 Oct 2025 |
As of 31 Dec 2025, 25 institutional investors reported holding 6,568,805 shares of Quantumsphere Acquisition Corp - Ordinary Shares, par value $0.0001 per share (QUMS). This represents 58% of the company’s total 11,398,190 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of Quantumsphere Acquisition Corp - Ordinary Shares, par value $0.0001 per share (QUMS) together control 58% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| MIZUHO SECURITIES USA LLC | 6.3% | 718,086 | 0.12% | $7,128,939 | |
| WOLVERINE ASSET MANAGEMENT LLC | 5% | 575,222 | 0.08% | $5,757,972 | |
| Karpus Management, Inc. | 4.3% | 494,350 | 0.15% | $4,948,444 | |
| Shaolin Capital Management LLC | 4.2% | 480,000 | 0.18% | $4,804,800 | |
| Clear Street Group Inc. | 3.7% | 424,762 | +30262% | 0.02% | $4,251,868 |
| Glazer Capital, LLC | 3.7% | 424,153 | 0.11% | $4,246,000 | |
| D. E. Shaw & Co., Inc. | 3.6% | 409,860 | 0% | $4,102,699 | |
| Linden Advisors LP | 3.5% | 400,000 | 0.02% | $4,004,000 | |
| AQR Arbitrage LLC | 2.8% | 322,660 | 0.07% | $3,229,827 | |
| BERKLEY W R CORP | 2.7% | 303,580 | 0.17% | $3,038,836 | |
| HGC Investment Management Inc. | 2.6% | 300,000 | 0.64% | $3,003,000 | |
| Westchester Capital Management, LLC | 2.2% | 250,000 | 0.12% | $2,502,501 | |
| Hudson Bay Capital Management LP | 2.1% | 235,000 | 0% | 0.01% | $2,352,350 |
| TWO SIGMA INVESTMENTS, LP | 1.9% | 217,479 | 0% | $2,176,965 | |
| TORONTO DOMINION BANK | 1.5% | 175,778 | 0% | $1,759,538 | |
| Cable Car Capital, LP | 1.5% | 174,801 | 0.11% | $1,749,758 | |
| HEIGHTS CAPITAL MANAGEMENT, INC | 1.3% | 150,000 | 0.57% | $1,501,500 | |
| Radcliffe Capital Management, L.P. | 1.3% | 150,000 | 0.08% | $1,501,500 | |
| Periscope Capital Inc. | 1.1% | 125,000 | 0.24% | $1,251,250 | |
| BNP PARIBAS FINANCIAL MARKETS | 0.9% | 102,340 | 0% | 0% | $1,024,423 |
| Schonfeld Strategic Advisors LLC | 0.48% | 55,000 | 0% | $550,550 | |
| Warberg Asset Management LLC | 0.36% | 41,421 | 0.12% | $414,624 | |
| Virtu Financial LLC | 0.22% | 24,783 | +66% | 0.01% | $248,000 |
| Logan Stone Capital, LLC | 0.13% | 14,500 | 0.04% | $145,145 | |
| MORGAN STANLEY | 0% | 30 | 0% | $300 |