4 institutions reported holding $5.8M of TELEFONICA S A (TEFOF) in SEC 13F filings for 2026-03-31. Largest institutional holders: Generali Investments CEE, investicni spolecnost, a.s. ($5.8M), SIMPLEX TRADING, LLC ($3,038), GROUP ONE TRADING LLC ($0), Optiver Holding B.V. ($0). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | Generali Investments CEE, investicni spolecnost, a.s. | $5.8M | 1.3M | Added |
| 2 | SIMPLEX TRADING, LLC | $3,038 | 700 | Trimmed |
| 3 | GROUP ONE TRADING LLC | $0 | 0 | Exited |
| 4 | Optiver Holding B.V. | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31