Addition Therapeutics
South San Francisco, US · Founded 2021 · 69 employees on LinkedIn · 7 known investors
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Addition Therapeutics is a biotechnology company developing therapeutics, led by a scientific and clinical team. Its work centers on drug discovery and portfolio development in the life sciences.
Founders & leadership
Addition Therapeutics was founded in 2021 by Kathleen Collins.


Board




Investors · 7
How we know: Pivotal Life Sciences's portfolio page · a partner's Signal profile · pulse2.com · Not right? Tell us
How we know: SR One Capital Management's portfolio page · board seat on SEC Form D · Not right? Tell us
How we know: a partner's Signal profile · pulse2.com · Not right? Tell us
Also in the syndicate · 2
Funding
SEC filings, press & company announcements$128M disclosed across 2 rounds · 2025
- $100MraisedDec 2025 · 5 sources
Abingworth, BEVC, Gates Foundation, Osage University Partners, Pivotal Life Sciences, SR One
Source ↗
▶$28MraisedDec 2025 · 9 investors · BiotechnologyRule 506(b)
- Kathleen CollinsDirector
- Jayson PunwaniDirector
- Matthew PattersonDirector
- Peter BisgaardDirector
- Lawrence KongExecutive Officer
- Jennifer LeeDirector
- Laetitia SchwabDirector
- Ronald ParkExecutive Officer, Director
- Offering amount
- $28M
- Amount sold
- $28M
- First sale
- Dec 2025
- Incorporated
- Corporation, Delaware, 2021
- Federal exemptions
- 06b
Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.
In the news
Frequently asked questions
- What does Addition Therapeutics do?
- Addition Therapeutics is a biotechnology company developing therapeutics, led by a scientific and clinical team. Its work centers on drug discovery and portfolio development in the life sciences.
- Who founded Addition Therapeutics?
- Addition Therapeutics was founded by Kathleen Collins in 2021.
- Who are Addition Therapeutics's investors?
- Addition Therapeutics's investors include BEVC, Pivotal Life Sciences, SR One Capital Management, Abingworth, Osage University Partners.
- How much funding has Addition Therapeutics raised?
- Addition Therapeutics has disclosed $128M raised across 2 rounds.
- Where is Addition Therapeutics headquartered?
- Addition Therapeutics is headquartered in South San Francisco, US.







