16 institutions reported holding $12.6M of ARQIT QUANTUM INC (ARQQW) in SEC 13F filings for 2026-06-30. Largest institutional holders: NATIONAL BANK OF CANADA /FI/ ($6.3M), IMC-Chicago, LLC ($3.6M), GROUP ONE TRADING LLC ($2.0M), SIMPLEX TRADING, LLC ($276,396), Foundations Investment Advisors, LLC ($211,197). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | NATIONAL BANK OF CANADA /FI/ | $6.3M | 2,124 | New |
| 2 | IMC-Chicago, LLC | $3.6M | 119,900 | Added |
| 3 | GROUP ONE TRADING LLC | $2.0M | 67,700 | Added |
| 4 | SIMPLEX TRADING, LLC | $276,396 | 9,300 | Added |
| 5 | Foundations Investment Advisors, LLC | $211,197 | 3.0M | Trimmed |
| 6 | SLT Holdings LLC | $211,197 | 3.0M | Trimmed |
| 7 | MILLENNIUM MANAGEMENT LLC | $13,942 | 195,000 | Hold |
| 8 | HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | $5,272 | 73,728 | Hold |
| 9 | Vestcor Inc | $5,000 | 75,000 | Hold |
| 10 | GOLDMAN SACHS GROUP INC | $3,383 | 47,320 | Hold |
| 11 | JANE STREET GROUP, LLC | $3,022 | 42,263 | Trimmed |
| 12 | Silver Rock Financial LP | $3,013 | 42,139 | Hold |
| 13 | ABLE Financial Group, LLC | $2,156 | 30,154 | New |
| 14 | OSAIC HOLDINGS, INC. | $1,568 | 251 | Trimmed |
| 15 | WOLVERINE ASSET MANAGEMENT LLC | $739 | 10,329 | Added |
| 16 | UBS Group AG | $127 | 1,792 | Trimmed |
Source: SEC Form 13F filings · as of 2026-06-30