Company · CIK 0001701108 · SIC 2834 — Pharmaceutical Preparations · Nasdaq
Spero Therapeutics, Inc. · SPRO
Insider activity reported against this company. All insider holders · On EDGAR ↗
Reported at this company — common stock
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Aug 3, 2026 AForm 4 → | Aug 6, 6:49 pm EDT | Debra ZackChief Medical Officer | 162,311 | — | — | 162,311 | — | 10b5-1 late |
| Jun 23, 2026 AForm 4 → | Jun 25, 7:26 pm EDT | Milind DeshpandeDirector | 10,000 | — | — | 101,454 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 7:17 pm EDT | Kathleen TregoningDirector | 10,000 | — | — | 85,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 7:14 pm EDT | Cynthia SmithDirector | 10,000 | — | — | 85,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 7:12 pm EDT | Patrick V.J.J. VinkDirector | 10,000 | — | — | 85,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 6:59 pm EDT | Frank E ThomasDirector | 10,000 | — | — | 85,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 6:57 pm EDT | Scott Thomas JacksonDirector | 10,000 | — | — | 85,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 6:55 pm EDT | John C Pottage Jr.Director | 10,000 | — | — | 85,000 | — |
Reported at this company — derivatives (options, RSUs, warrants)
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Aug 3, 2026 AForm 4 → | Aug 6, 6:49 pm EDT | Debra ZackChief Medical Officer | 324,675 | — | — | 324,675 | — | 10b5-1 late |
| Jun 23, 2026 AForm 4 → | Jun 25, 7:26 pm EDT | Milind DeshpandeDirector | 20,000 | — | — | 20,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 7:17 pm EDT | Kathleen TregoningDirector | 20,000 | — | — | 20,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 7:14 pm EDT | Cynthia SmithDirector | 20,000 | — | — | 20,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 7:12 pm EDT | Patrick V.J.J. VinkDirector | 20,000 | — | — | 20,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 6:59 pm EDT | Frank E ThomasDirector | 20,000 | — | — | 20,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 6:57 pm EDT | Scott Thomas JacksonDirector | 20,000 | — | — | 20,000 | — | |
| Jun 23, 2026 AForm 4 → | Jun 25, 6:55 pm EDT | John C Pottage Jr.Director | 20,000 | — | — | 20,000 | — |