Form 4 holding
Chief Medical Officer
Spero Therapeutics, Inc.
- Security class
- Common Stock
- Shares / value
- 162,311
- Estimated value
- $358,707
- Report date
- 03 Aug 2026
- Price
- $2.21
- Ownership
- Direct
Debra Jeske Zack - Chief Medical Officer at Spero Therapeutics, Inc.
Issuer-level insider activity
- Role
- Chief Medical Officer
- Issuer ticker
- SPRO on Nasdaq
- Entity type
- Individual
- Source filing history
- Open source filing history
Identity
Names, identifiers, and filing context for this profile.
1 identity field
Source evidence
Original filing metadata and source links for verification.
1 source field
No buys or sells have been reported by Debra Jeske Zack since 05 Sep 2025
Reported holdings for Debra Jeske Zack in Spero Therapeutics, Inc.
Form 4 holding
Chief Medical Officer
Spero Therapeutics, Inc.
- Security class
- Stock option (right to buy)
- Shares / value
- 324,675
- Estimated value
- Report date
- 03 Aug 2026
- Price
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
Transaction history for Debra Jeske Zack in Spero Therapeutics, Inc.
| Sym | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares after | Date | Ownership |
|---|
* marks a reported price that did not pass the local price check.