3 institutions reported holding $394,531 of GRIFOLS S A (GIKLY) in SEC 13F filings for 2026-03-31. Largest institutional holders: SIMPLEX TRADING, LLC ($293,532), YOUSIF CAPITAL MANAGEMENT, LLC ($68,117), GROUP ONE TRADING LLC ($32,882). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | SIMPLEX TRADING, LLC | $293,532 | 36,600 | Added |
| 2 | YOUSIF CAPITAL MANAGEMENT, LLC | $68,117 | 13,202 | Hold |
| 3 | GROUP ONE TRADING LLC | $32,882 | 4,100 | Trimmed |
Source: SEC Form 13F filings · as of 2026-03-31