Spero Therapeutics, Inc. · NASDAQ:SPRO
Spero Therapeutics, Inc. shareholders
As of Jun 30, 2026, 56 institutions reported holding Spero Therapeutics, Inc., 36.9% of its shares. Largest: GSK plc, Pfizer Inc and Vanguard. New holders, exits, insiders and big stakes, each with its filing.
| Holder | Shares | % of Spero Therapeutics, Inc. | Change | Filed |
|---|---|---|---|---|
| GSK plc | 9.19M | 15.8% | no change | Aug 13, 2026 |
| Pfizer Inc | 2.36M | 4.1% | no change | Aug 13, 2026 |
| Vanguard | 2.35M | 4.0% | +260K | Aug 13, 2026 |
| Renaissance Technologies | 948K | 1.6% | −241K | Aug 13, 2026 |
| Alphabet Inc. | 890K | 1.5% | no change | Aug 7, 2026 |
| Susquehanna | 793K | 1.4% | +460K | Aug 14, 2026 |
| BlackRock | 594K | 1.0% | +161K | Aug 7, 2026 |
| Geode Capital | 566K | 0.97% | +46,407 | Aug 12, 2026 |
| Raymond James Financial Inc | 522K | 0.90% | new | Aug 14, 2026 |
| Two Sigma | 393K | 0.68% | −492K | Aug 14, 2026 |