Registered entities
Spero Therapeutics, Inc.
Reg. No. 464590683United States
Spero Therapeutics, Inc.
Reg. No. 20181300821United States
Innovation
17 patent families (11 granted) — focus: Chemistry & metallurgy, Human necessities; filing pace steady. Cited 884 times.
| Year | Filings |
|---|---|
| 2016 | 5 |
| 2017 | 3 |
| 2018 | 3 |
| 2019 | 2 |
| 2020 | 5 |
| 2021 | 7 |
| 2022 | 8 |
| 2023 | 5 |
| 2024 | 8 |
| 2025 | 5 |
| 2026 | 3 |
Social engagement
Social engagement: 15.1K social following, 10 posts in the last 12 months — below the industry typical range.
Investor mix
18 investors on record; lead investors include Google Ventures, Atlas Venture, SR One, Lundbeck Foundation; 3 have since exited.
| Investor type | Count | Share |
|---|---|---|
| Venture capital | 9 | 50% |
| Private equity | 2 | 11% |
| Angel & family office | 1 | 6% |
| Other / undisclosed | 6 | 33% |
Recent activity
17 Jun 2026
Milestone
regulatory
13 May 2026
Milestone
5 May 2026
Milestone
regulatory