3 institutions reported holding $19.6M of IRIDIUM COMMUNICATIONS INC (IRDMB) in SEC 13F filings for 2026-06-30. Largest institutional holders: IMC-Chicago, LLC ($10.3M), GROUP ONE TRADING LLC ($6.9M), SIMPLEX TRADING, LLC ($2.4M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | IMC-Chicago, LLC | $10.3M | 188,100 | Added |
| 2 | GROUP ONE TRADING LLC | $6.9M | 126,200 | Trimmed |
| 3 | SIMPLEX TRADING, LLC | $2.4M | 43,900 | Trimmed |
Source: SEC Form 13F filings · as of 2026-06-30