Quantumsphere Acquisition Corp - Ordinary Shares, par value $0.0001 per share (QUMS)

Q: What does CUSIP G7387B106 represent in this 13F holders report?

CUSIP G7387B106 is the security identifier for QUMS - Quantumsphere Acquisition Corp - Ordinary Shares, par value $0.0001 per share used to aggregate holder disclosures.

Q: How many institutions held QUMS - Quantumsphere Acquisition Corp - Ordinary Shares, par value $0.0001 per share in Q2 2026?

1 institutional investor reported QUMS - Quantumsphere Acquisition Corp - Ordinary Shares, par value $0.0001 per share for Q2 2026. Use the holders table for investor-level position and value details.

CUSIP: G7387B106

Q2 2026 13F Holders as of 30 Jun 2026

Security type / class: Equity / Ordinary Shares, par value $0.0001 per share
Total 13F shares: 757,023
Total 13F value: $7,683,783
Share change: +25,039
SEC-reported price per share: $10.15
Number of holders: 1
Value change: +$254,146
Number of buys: 1
Shares outstanding: 11,398,190

Security key

G7387B106

Report period

Q2 2026

Institutions

Top holders

QUMS full security history Ownership snapshot Full 13F holder table Previous quarter: Q1 2026 Quantumsphere Acquisition Corp SEC filings Quantumsphere Acquisition Corp company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP G7387B106

Previous quarter: Q1 2026

Recent filing periods:

Q2 2026 Q1 2026 Q4 2025 Q3 2025

Ownership snapshot

Top reported holders of QUMS - Quantumsphere Acquisition Corp - Ordinary Shares, par value $0.0001 per share (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 SECURITIES USA LLC

Comparable rows

10/15

Latest evidence

31 Mar 2026

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 6.4%

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 3/4/5 13D/G	27% from 13D/G	— 3,126,650 shares	—	05 Aug 2025
MIZUHO FINANCIAL GROUP INC	13D/G 13D/G	6.3%	$7,188,041 718,086 shares	$0	31 Dec 2025
WOLVERINE ASSET MANAGEMENT LLC	13F 13D/G Company 13F 13D/G	5% from 13D/G	$6,146,121 739,197 shares mixed-class rows	—	31 Mar 2026
MIZUHO SECURITIES USA LLC	13F Company 13F	6.4%	$7,356,439 731,984 shares	—	31 Mar 2026
Karpus Management, Inc.	13F Company 13F	4.3%	$4,998,015 493,875 shares	—	31 Mar 2026
Crossingbridge Advisors, LLC	13F Company 13F	0.95%	$1,091,189 107,825 shares	—	31 Mar 2026

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 Q2 2026

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

757,023

Rows available

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 Q2 2026 vs Q1 2026 Across Filers

Q1 2026 holders

Q2 2026 holders

Holder diff

-28

Investor	Q1 2026 Shares	Q2 2026 Shares	Share Diff	Share Chg %	Q1 2026 value	Q2 2026 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend