3 institutions reported holding $6.0M of AVANTOR INC (AVTR-PA) in SEC 13F filings for 2026-06-30. Largest institutional holders: SIMPLEX TRADING, LLC ($3.2M), GROUP ONE TRADING LLC ($1.5M), IMC-Chicago, LLC ($1.4M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | SIMPLEX TRADING, LLC | $3.2M | 319,200 | Added |
| 2 | GROUP ONE TRADING LLC | $1.5M | 149,400 | Added |
| 3 | IMC-Chicago, LLC | $1.4M | 139,800 | Added |
Source: SEC Form 13F filings · as of 2026-06-30