3 institutions reported holding $9.9M of FORUM MARKETS INC (ATNFW) in SEC 13F filings for 2026-06-30. Largest institutional holders: GROUP ONE TRADING LLC ($6.4M), SIMPLEX TRADING, LLC ($3.2M), IMC-Chicago, LLC ($319,827). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | GROUP ONE TRADING LLC | $6.4M | 1.2M | Trimmed |
| 2 | SIMPLEX TRADING, LLC | $3.2M | 584,000 | Added |
| 3 | IMC-Chicago, LLC | $319,827 | 58,900 | Trimmed |
Source: SEC Form 13F filings · as of 2026-06-30