Quantum Cyber N.V. (QUCY) Ownership
QUCY ownership summary
as of October 18, 2026- Institutions
- 0.3% of shares outstanding
- Insiders
- 67.97% of shares outstanding
- Shares outstanding
- 87.2M
- Float
- 24.3M shares available to trade
- Short interest
- 1.93% 1.6M shares short
- Days to cover
- 2.58 short interest down 13.5% vs prior month
- Institutions 0.27%
- Insiders 67.97%
- Other investors 31.75%
QUCY top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Jane Street Group LLC | 0.10% | 85K | $89,648 | +68,481 (+425.5%) | June 30, 2026 |
| 2 | Virtu Financial LLC | 0.05% | 41K | $43,532 | +12,229 (+42.4%) | June 30, 2026 |
| 3 | UBS Group AG | 0.03% | 26K | $27,677 | −60,466 (−69.8%) | June 30, 2026 |
| 4 | Steward Partners Investment Advisory, LLC | 0.02% | 20K | $21,200 | −10,000 (−33.3%) | June 30, 2026 |
| 5 | XTX Topco Ltd | 0.01% | 11K | $12,074 | −52,876 (−82.3%) | June 30, 2026 |
| 6 | Morgan Stanley - Brokerage Accounts | 0.01% | 11K | $11,858 | +10,998 (+5,819.0%) | June 30, 2026 |
| 7 | Professional Advisory Services Inc | 0.01% | 10K | $10,600 | +10,000 (0.0%) | June 30, 2026 |
| 8 | Journey Advisory Group, LLC | 0.01% | 10K | $10,600 | −5,000 (−33.3%) | June 30, 2026 |
| 9 | Keystone Financial Group Inc | 0.01% | 5,300 | $5,618 | +5,300 (0.0%) | June 30, 2026 |
| 10 | Tower Research Capital LLC | <0.01% | 4,000 | $4,240 | +4,000 (0.0%) | June 30, 2026 |
| 11 | Advisor Group Holdings, Inc. | <0.01% | 2,190 | $2,321 | +2,190 (0.0%) | June 30, 2026 |
| 12 | SBI Securities Co Ltd | <0.01% | 1,289 | $1,366 | −10,349 (−88.9%) | June 30, 2026 |
| 13 | Provenance Wealth Advisors | <0.01% | 1,171 | $1,241 | — | June 30, 2026 |
| 14 | Nbc Securities Inc | <0.01% | 790 | $837 | +790 (0.0%) | June 30, 2026 |
| 15 | Newbridge Financial Services Group, Inc. | <0.01% | 500 | $530 | — | June 30, 2026 |
| 16 | IFP Advisors, LLC | <0.01% | 90 | $95 | — | June 30, 2026 |
| 17 | Citigroup Inc | 0.00% | 42 | $45 | +42 (0.0%) | June 30, 2026 |
| 18 | Susquehanna International Group, LLP | 0.00% | — | — | −18,517 (−100.0%) | June 30, 2026 |
| 19 | CI Private Wealth LLC | 0.00% | — | — | −40,000 (−100.0%) | March 31, 2026 |
| 20 | Citadel Advisors Llc | 0.00% | — | — | −12,643 (−100.0%) | March 31, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 9 holders added 114K shares and 8 cut 210K.
QUCY top mutual fund and ETF holders
1 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Fidelity Nasdaq Composite Index | 0.01% | 9,293 | $9,851 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
Who owns QUCY
Institutional investors own 0.3% of Quantum Cyber's shares and insiders 67.97%. The largest holder is Jane Street Group LLC with 0.10% of the shares (85K), as of June 30, 2026. Among the top 20 institutions, 9 added shares and 8 reduced their stake in the latest filings. Short interest is 1.93% of the float, or 2.58 days of average trading volume. The share count rose 281.5% since 2024.
Related: QUCY analyst forecast, QUCY key metrics. See the QUCY stock overview for the latest quote and news.
QUCY ownership FAQ
Who owns the most Quantum Cyber stock?
The largest shareholders of Quantum Cyber are Jane Street Group LLC (0.10%), Virtu Financial LLC (0.05%), UBS Group AG (0.03%), Steward Partners Investment Advisory, LLC (0.02%), XTX Topco Ltd (0.01%).
What percentage of Quantum Cyber is owned by institutions?
Institutions hold 0.3% of Quantum Cyber's shares outstanding; insiders hold 67.97%.
Which funds own Quantum Cyber?
The largest fund holders of Quantum Cyber are Fidelity Nasdaq Composite Index (0.01%).
What is Quantum Cyber's short interest?
1.6M shares of Quantum Cyber were sold short, 1.93% of the float; at the average daily volume it would take 2.58 days to cover.
How many shares of Quantum Cyber are outstanding?
Quantum Cyber has 87.2M shares outstanding, of which 24.3M are in the public float.