6 institutions reported holding $29.1M of MIRION TECHNOLOGIES INC (MIR.WS) in SEC 13F filings for 2026-06-30. Largest institutional holders: IMC-Chicago, LLC ($9.8M), GROUP ONE TRADING LLC ($6.2M), SG Americas Securities, LLC ($5.1M), SIMPLEX TRADING, LLC ($4.4M), HRT FINANCIAL LP ($3.6M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | IMC-Chicago, LLC | $9.8M | 547,900 | Added |
| 2 | GROUP ONE TRADING LLC | $6.2M | 344,400 | Added |
| 3 | SG Americas Securities, LLC | $5.1M | 984,000 | Hold |
| 4 | SIMPLEX TRADING, LLC | $4.4M | 247,400 | Added |
| 5 | HRT FINANCIAL LP | $3.6M | 200,000 | Hold |
| 6 | Troluce Capital Advisors LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30