Who owns Arqit Quantum Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of ARQQ from SEC Form 13F filings across 64 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 64 institutions disclosed 12.3M shares of Arqit Quantum Inc. worth $360.6M — about 74.2% of shares outstanding; the largest disclosed holder is Defiance ETFs, LLC. Source: SEC Form 13F filings, parsed by EvidInvest.
64
13F holders
$360.6M
value, 2026 filers
74.2%
of shares outstanding (12.3M sh)
21
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of ARQQ's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | Defiance ETFs, LLC | 5.1M | $147.1M | 2.0% | 30.8% | +251.1% |
| 2 | Penserra Capital Management LLC | 5.1M | $151.0M | 1.2% | 30.6% | +249.9% |
| 3 | UBS Group AG | 522,874 | $15.5M | 0.0% | 3.2% | +512.0% |
| 4 | Legal & General Group Plc | 275,939 | $8.1M | 0.0% | 1.7% | +424.3% |
| 5 | NATIONAL BANK OF CANADA /FI/ | 212,000 | $6.3M | 0.0% | 1.3% | +19296.2% |
| 6 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 188,182 | $5.6M | 0.0% | 1.1% | -42.0% |
| 7 | Kessler Investment Group, LLC | 153,105 | $4.6M | 1.9% | 0.9% | -2.8% |
| 8 | Bank of New York Mellon Corp | 99,146 | $2.9M | 0.0% | 0.6% | +732.3% |
| 9 | RAYMOND JAMES FINANCIAL INC | 95,250 | $2.8M | 0.0% | 0.6% | +49.2% |
| 10 | MILLENNIUM MANAGEMENT LLC | 78,717 | $2.3M | 0.0% | 0.5% | +45.7% |
| 11 | BANK OF AMERICA CORP /DE/ | 54,192 | $1.6M | 0.0% | 0.3% | +182.4% |
| 12 | VAN ECK ASSOCIATES CORP | 49,487 | $1.5M | 0.0% | 0.3% | +145.6% |
| 13 | Cetera Investment AdvisersNEW | 38,198 | $1.1M | 0.0% | 0.2% | new |
| 14 | BANQUE PICTET & CIE SA | 36,000 | $1.1M | 0.0% | 0.2% | 0.0% |
| 15 | KKM Financial LLCNEW | 31,394 | $537,779 | 0.1% | 0.2% | new |
| 16 | Man Group plcNEW | 26,210 | $778,961 | 0.0% | 0.2% | new |
| 17 | SBI Securities Co., Ltd. | 26,135 | $776,732 | 0.0% | 0.2% | -3.6% |
| 18 | Advisory Services Network, LLC | 21,737 | $646,023 | 0.0% | 0.1% | 0.0% |
| 19 | Zurcher Kantonalbank (Zurich Cantonalbank) | 21,296 | $632,917 | 0.0% | 0.1% | +113.4% |
| 20 | WELLS FARGO & COMPANY/MN | 21,291 | $632,768 | 0.0% | 0.1% | +41.1% |
| 21 | LPL Financial LLCNEW | 17,109 | $508,479 | 0.0% | 0.1% | new |
| 22 | MORGAN STANLEY | 16,276 | $483,723 | 0.0% | 0.1% | +73.5% |
| 23 | Tidal Investments LLCNEW | 16,020 | $476,114 | 0.0% | 0.1% | new |
| 24 | CITIGROUP INC | 14,572 | $433,080 | 0.0% | 0.1% | +48.0% |
| 25 | GROUP ONE TRADING LLC | 12,682 | $376,909 | 0.0% | 0.1% | -5.8% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.