Defiant Health key facts
as of Oct 2026- Operator of a virtual breast health clinic intended to accelerate expert diagnosis and treatment for breast cancer.
- Defiant Health is valued at approximately $17.0M as of Oct 2026 (last reported valuation).
- It has raised $3.8M; the latest was Seed Round ($3.8M) in Jul 2025.
- Notable investors include City Light Capital, Amboy Street Ventures, Hannah Grey Ventures, Headwater Ventures.
- Status: Privately Held (backing).
Defiant Health's last reported valuation, Jul 2025. Nothing priced has surfaced since.
- ·Watch Defiant Health: the Monday email on marks, rounds and moves
Defiant Health funding rounds
No funding rounds for Defiant Health are on record yet — either the company hasn't raised institutional capital, or the raise hasn't surfaced in our sources.
Who backs Defiant Health
4Defiant Health valuation
Defiant Health's last reported valuation was $17 million in Jul 2025. No priced round, secondary trade or fund mark has surfaced since.
Defiant Health investors
4 investors are on record for Defiant Health, including City Light Capital, Amboy Street Ventures, Hannah Grey Ventures and Headwater Ventures.
About Defiant Health
Operator of a virtual breast health clinic intended to accelerate expert diagnosis and treatment for breast cancer. The company offers a tech-enabled, patient-centered diagnostic platform that partners with Dana-Farber Cancer Institute to deliver rapid, expert-led breast cancer evaluations, enabling customers to receive personalized care, faster answers and reduced time to treatment often within days instead of months.
- Sector
- Healthcare
- HQ
- Boston, MA, United States
- Employees
- 7
- Website
- defianthealth.com/
- Ownership
- Privately Held (backing)
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