Key facts
- Defiant Health’s last known valuation is $17.0M (Jul 2025).
- 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).
- ·The complete investor list — 4 names
- ·Watchlist + deal alerts for Defiant Health
- ·The full record, as it builds
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.
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)
Defiant Health doesn't have a composite mark yet — a PA Mark is published once enough pricing inputs exist (trade prints, fund marks, round prices). The rest of the record below builds toward it.
Recorded secondary trades
No secondary trades in Defiant Health shares have been recorded yet. When a print lands — third-party, direct report, or platform — it appears here with structure, source, and price.
Institutional fund marks
No SEC-registered fund has reported a fair-value mark on Defiant Health in its N-PORT filings yet. We sweep new filings monthly.