16 institutions reported holding $1.8M of ARQIT QUANTUM INC (ARQQW) in SEC 13F filings for 2026-03-31. Largest institutional holders: GROUP ONE TRADING LLC ($474,350), Foundations Investment Advisors, LLC ($449,716), SLT Holdings LLC ($449,716), IMC-Chicago, LLC ($230,550), SIMPLEX TRADING, LLC ($102,025). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | GROUP ONE TRADING LLC | $474,350 | 35,800 | Trimmed |
| 2 | Foundations Investment Advisors, LLC | $449,716 | 3.0M | Hold |
| 3 | SLT Holdings LLC | $449,716 | 3.0M | Hold |
| 4 | IMC-Chicago, LLC | $230,550 | 17,400 | Added |
| 5 | SIMPLEX TRADING, LLC | $102,025 | 7,700 | Trimmed |
| 6 | MILLENNIUM MANAGEMENT LLC | $28,860 | 195,000 | Hold |
| 7 | Vestcor Inc | $11,000 | 75,000 | Hold |
| 8 | HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | $10,912 | 73,728 | Hold |
| 9 | GOLDMAN SACHS GROUP INC | $7,003 | 47,320 | Hold |
| 10 | JANE STREET GROUP, LLC | $6,314 | 42,663 | Added |
| 11 | Silver Rock Financial LP | $6,237 | 42,139 | Hold |
| 12 | OSAIC HOLDINGS, INC. | $2,175 | 11,251 | Added |
| 13 | WOLVERINE ASSET MANAGEMENT LLC | $486 | 3,282 | Hold |
| 14 | UBS Group AG | $325 | 2,196 | Added |
| 15 | Virtu Financial LLC | $0 | 0 | Exited |
| 16 | NATIONAL BANK OF CANADA /FI/ | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31