QUMS · Insider trading · 13F holders · Congress trades
Quantumsphere Acquisition Corp (QUMS)
Who is buying and selling QUMS: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 2
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 0
QUMS at a glance
- No open-market insider purchases or sales of QUMS were filed in the last 90 days.
- 2 13F filers hold QUMS among their 50 largest positions, worth $11.6M combined. The biggest bets by portfolio weight are RLH Capital LLC (1.2%) and Berkley W R Corp (0.5%).
- No member of Congress has disclosed a trade in QUMS.
QUMS insider trading
No open-market insider purchases or sales of QUMS were filed in the last 90 days.
Who owns QUMS? Hedge funds and superinvestors
2 13F filers hold QUMS among their 50 largest positions, worth $11.6M combined. The biggest bets by portfolio weight are RLH Capital LLC (1.2%) and Berkley W R Corp (0.5%).
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Berkley W R CorpInsurance company | 0.5% | $9.0M | 881,402 | — | Q2 2026 |
| RLH Capital LLCHedge fund | 1.2% | $2.6M | 250,000 | — | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 2). Screen QUMS in the grand portfolio →
QUMS stock trades by members of Congress
No member of Congress has disclosed a trade in QUMS.
QUMS questions and answers
Are insiders buying QUMS stock?
No open-market insider purchases or sales of QUMS were filed in the last 90 days.
Which hedge funds own QUMS?
2 13F filers hold QUMS among their 50 largest positions, worth $11.6M combined. The biggest bets by portfolio weight are RLH Capital LLC (1.2%) and Berkley W R Corp (0.5%).
Has Congress traded QUMS?
No member of Congress has disclosed a trade in QUMS.
Who is the largest holder of QUMS?
Among 13F filers, Berkley W R Corp reports the largest QUMS position, $9.0M (881,402 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is RLH Capital LLC's: 1.2% of its portfolio.
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