3 institutions reported holding $1.8M of GRID DYNAMICS HLDGS INC (GDYNW) in SEC 13F filings for 2026-06-30. Largest institutional holders: SIMPLEX TRADING, LLC ($943,448), GROUP ONE TRADING LLC ($700,912), IMC-Chicago, LLC ($156,200). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | SIMPLEX TRADING, LLC | $943,448 | 166,100 | Added |
| 2 | GROUP ONE TRADING LLC | $700,912 | 123,400 | Added |
| 3 | IMC-Chicago, LLC | $156,200 | 27,500 | New |
Source: SEC Form 13F filings · as of 2026-06-30