Arqit Quantum Inc.
Ownership
Ownership Structure
Who owns Arqit Quantum Inc. (ARQQ)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 28.9% of the shares are freely tradable; institutional investors hold 27.0%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Defiance ETFs, LLC | 33.80 | 5,099,023 | +251.1 | 06/30/2026 |
| Penserra Capital Management, LLC | 33.68 | 5,081,219 | +249.9 | 06/30/2026 |
| UBS Group AG | 3.47 | 522,874 | +512.0 | 06/30/2026 |
| Legal & General Group PLC | 1.83 | 275,939 | +424.3 | 06/30/2026 |
| NATIONAL BANK OF CANADA /FI/ | 1.41 | 212,000 | +19,296.2 | 06/30/2026 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 1.25 | 188,182 | -42.0 | 06/30/2026 |
| Kessler Investment Group, LLC | 1.01 | 153,105 | -2.8 | 06/30/2026 |
| Bank of New York Mellon Corp | 0.66 | 99,146 | +732.3 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Global X Cybersecurity ETF | 1.68 | 253,616 | +1.9 | 09/29/2026 |
| Undly L&G Future World UK Eq Idx Fd | 1.66 | 250,174 | +447.9 | 06/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Lefebvre d'Ovidio Manfredi | Director | 8,942,448 | 219,984,221 $ | Sep 22, 2026 | indirect |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 22, 2026 | Lefebvre d'Ovidio Manfredi | Director | Other | 4,600,000 | 2.50 | 11,500,000 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: October 2, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.