3 institutions reported holding $11.0M of IRIDIUM COMMUNICATIONS INC (IRDMB) in SEC 13F filings for 2026-03-31. Largest institutional holders: GROUP ONE TRADING LLC ($6.4M), IMC-Chicago, LLC ($3.0M), SIMPLEX TRADING, LLC ($1.7M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | GROUP ONE TRADING LLC | $6.4M | 229,100 | Added |
| 2 | IMC-Chicago, LLC | $3.0M | 107,400 | Added |
| 3 | SIMPLEX TRADING, LLC | $1.7M | 61,300 | Trimmed |
Source: SEC Form 13F filings · as of 2026-03-31