Who Owns FORUM MARKETS INC (ATNFW)? -- Institutional Holders (2026-06-30)

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.

RankInstitutionValueSharesChange
1GROUP ONE TRADING LLC$6.4M1.2MTrimmed
2SIMPLEX TRADING, LLC$3.2M584,000Added
3IMC-Chicago, LLC$319,82758,900Trimmed

Source: SEC Form 13F filings · as of 2026-06-30