Quantumsphere Acquisition Corp - Class A 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 - Class A ordinary shares, par value $0.0001 per share used to aggregate holder disclosures.

Q: How many institutions held QUMS - Quantumsphere Acquisition Corp - Class A ordinary shares, par value $0.0001 per share in Q1 2026?

29 institutional investors reported QUMS - Quantumsphere Acquisition Corp - Class A ordinary shares, par value $0.0001 per share for Q1 2026. Use the holders table for investor-level position and value details.

CUSIP: G7387B106

Q1 2026 13F Holders as of 31 Mar 2026

Security type / class: Equity / Class A ordinary shares, par value $0.0001 per share
Total 13F shares: 7,555,578
Total 13F value: $76,411,551
Share change: +874,065
SEC-reported price per share: $10.12
Number of holders: 29
Value change: +$8,849,088
Number of buys: 9
Number of sells: 8
Shares outstanding: 11,446,779

Security key

G7387B106

Report period

Q1 2026

Institutions

Top holders

QUMS full security history Ownership snapshot Full 13F holder table Newer quarter: Q2 2026 Previous quarter: Q4 2025 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

Newer quarter: Q2 2026 Previous quarter: Q4 2025

Recent filing periods:

Q2 2026 Q1 2026 Q4 2025 Q3 2025

Ownership snapshot

Top reported holders of QUMS - Quantumsphere Acquisition Corp - Class A 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 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 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	$5,789,487 725,222 shares mixed-class rows	—	31 Dec 2025
MIZUHO SECURITIES USA LLC	13F Company 13F	6.3%	$7,128,939 718,086 shares	—	31 Dec 2025
Karpus Management, Inc.	13F Company 13F	4.3%	$4,948,444 494,350 shares	—	31 Dec 2025
TWO SIGMA INVESTMENTS, LP	13F Company 13F	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

7,555,578

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 Q1 2026 vs Q4 2025 Across Filers

Q4 2025 holders

Q1 2026 holders

Holder diff

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