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Quantumsphere Acquisition (QUMS): which funds own it

SPAC / vehículos(by SIC code, unreviewed)Data as of Jun 30, 2026 (Q2 2026) · updated on Nov 5, 2026

A 13F shows the portfolio at quarter-end and is filed up to 45 days later: these are not real-time positions and they may have changed.

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No concentrated manager holds it.

Who owns Quantumsphere Acquisition?

Holders that filed a Schedule 13D or 13G with the SEC for owning more than 5% of the shares: Whiteowl Holdings (13D filed Sep 15, 2025), Berkley W R (13G filed Aug 6, 2026) and Mizuho Financial Group (13G filed Feb 12, 2026). As of Jun 30, 2026, the largest holders reported on Form 13F were Mizuho Securities USA (1.5 million shares), Berkley W R (881,402 shares) and Wolverine Asset Management (602,984 shares).

Which institutions hold the most Quantumsphere Acquisition shares?

Per Form 13F filings as of Jun 30, 2026:

  1. 1. Mizuho Securities USA: 1.5 million shares
  2. 2. Berkley W R: 881,402 shares
  3. 3. Wolverine Asset Management: 602,984 shares
  4. 4. Karpus Management: 469,875 shares
  5. 5. Rivernorth Capital Management: 424,124 shares
  6. 6. D. E. Shaw: 409,860 shares
  7. 7. Shaolin Capital Management: 405,761 shares
  8. 8. Glazer Capital: 400,089 shares
  9. 9. Linden Advisors: 400,000 shares
  10. 10. Polar Asset Management Partners: 400,000 shares

Sources:13D by Whiteowl Holdings (Sep 15, 2025) ↗13G by Berkley W R (Aug 6, 2026) ↗13G by Mizuho Financial Group (Feb 12, 2026) ↗All of the company's proxy statements on EDGAR ↗

We hold 13D and 13G filings made since Dec 23, 2024: a holder above 5% that has not filed since then does not appear here.

Concentrated managers
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All 13F: 27
Consensus
—
No score: it needs 5 or more concentrated managers
Price at Jun 30, 2026 (per 13F)
$10.22
+1.0% in the quarter · reported value ÷ shares, not the quote · See current quote ↗

Quarter flow (concentrated managers)

Concentrated managers holding it

None in the latest quarter.

Largest holders of QUMS (all 13F filers)

The 10 13F filers with the most shares as of Jun 30, 2026, whatever their type (index firms usually come first). “Change”: shares added or cut versus the previous quarter, split-adjusted; “no data” = there is no comparable portfolio for the previous quarter (no filing, or a filing with its holdings under confidential treatment). “% of the company” only where shares outstanding are up to date. Entities of the same group file separately and some 13F filings include other managers: there may be double counting. With a free account: the top 25, the largest buyers and the largest sellers.

Fundamentals

12-month figures to Jun 30, 2026 · balance sheet as of Jun 30, 2026.

Profitability
Operating margin
—
Net margin
—
ROE
—
Growth
Revenue (TTM)
—
Revenue growth
—
Net income (TTM)
$1.6M
Balance sheet
Net debt / EBITDA
—
Free cash flow (TTM)
—
Quality vs sector
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This company's sector comes from its SIC code, unreviewed, or has too few comparable companies: we do not compare it with its sector.

Figures from the statements the company filed with the SEC (10-K, 10-Q). Free cash flow = operating cash flow − capital expenditures; empty if the company does not report capex. “Quality vs sector”: 0 to 100, the average of its percentiles in ROE, operating margin, free-cash-flow margin, revenue and earnings growth and net debt / EBITDA (at least 3 needed) against companies in its sector above $300M. How each figure is calculated

Earnings quality and debt

179.0% of net income does not come from operations.

Operating cash flow ÷ net income (12 months)
-0.73
Interest coverage (operating income ÷ interest)
no data
Debt due within 12 months
no data

From the figures the company filed with the SEC. Cash flow over net income near or above 1 means earnings are collected in cash; far below, that part is accounting. Coverage says how many times operating income pays the latest fiscal year's interest. Maturities come from the debt note of the latest annual report, counted from its closing date. “No data” never means zero.

Insiders (Form 4)

Officers and directors who bought (6 m)
no data
Amount (6 m)
no data
CEO/CFO bought (12 m)
No

Open-market purchases, excluding 10b5-1 plans. Officers and directors only; joint filers of the same purchase count as one. 10% owners with no role are shown separately. 0 = nobody bought; “no data” = we do not have its Form 4 filings.

Each of the company's Form 4 filings, on EDGAR ↗Latest trades, with date and filing →

Above 5% (13D/13G)

Disclosed stakes, with their amendments. A filing is not always a purchase: there are also reductions and changes of filing entity.

This list may be incomplete: we hold 13D and 13G filings made since Dec 23, 2024. A holder above 5% that has not filed anything since then is not shown here.

Above 5% over time (13D/13G)

Each holder with its filings in order. History since December 2024.

All material events (8-K)

Earnings, agreements, financing, management changes and announcements from the last year, with a filter by type and a link to each filing.

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