2 institutions reported holding $59,186 of SPERO THERAPEUTICS ORD (SPRO) in SEC 13F filings for 2026-06-30. Largest institutional holders: Assenagon Asset Management S.A. ($41,186), FNY Investment Advisers, LLC ($18,000). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | Assenagon Asset Management S.A. | $41,186 | 18,636 | Hold |
| 2 | FNY Investment Advisers, LLC | $18,000 | 8,300 | Added |
Source: SEC Form 13F filings · as of 2026-06-30