BillionToOne
NASDAQ: BLLNYC S17San Francisco, US · Founded 2016 · 300 employees · Public · Hiring · 22 known investors
BillionToOne is a precision diagnostics company that uses molecular counting technology to develop non-invasive prenatal screening and liquid biopsy tests for early disease detection. The company focuses on making molecular diagnostics accurate, fast, and accessible to patients.
Founders & leadership· Y Combinator alumni (S17)
BillionToOne was founded in 2016 by Oguzhan Atay, PhD, David Tsao, PhD, Oguzhan Atay, David Tsao, and Sukrit Silas.

Investors · 22
Funding
SEC filings, press & company announcementsSource: company announcements and press reports — follow each round's link for the claim.
Founder mafia
2 people who came through BillionToOne went on to found or lead other companies.
Competitors · 3
by search overlapCompanies competing with BillionToOne for the same Google search keywords, organic and paid, via search-intersection analysis.
Non-dilutive funding · 1 SBIR/STTR award
Federal grants — no equity taken| Agency | Phase | Year | Amount |
|---|---|---|---|
| National Institutes of Health (NIH)National Institutes of Health | Phase I | 2018 | $224.2K |
Source: SBIR.gov award data (U.S. Small Business Administration). SBIR/STTR awards are competitive federal R&D grants and contracts — non-dilutive capital alongside any venture rounds above.
In the news
Frequently asked questions
- What does BillionToOne do?
- BillionToOne is a precision diagnostics company that uses molecular counting technology to develop non-invasive prenatal screening and liquid biopsy tests for early disease detection. The company focuses on making molecular diagnostics accurate, fast, and accessible to patients.
- Who founded BillionToOne?
- BillionToOne was founded by Oguzhan Atay, PhD, David Tsao, PhD, Oguzhan Atay, David Tsao, Sukrit Silas in 2016.
- Who are BillionToOne's investors?
- BillionToOne's investors include 500 Emerging Europe, 500 Global, Asymmetry Ventures, Civilization Ventures Management, Llc, e2vc, Fifty Years, Friale, Hemisphere Ventures LLC and 14 more.
- Is BillionToOne publicly traded?
- Yes — BillionToOne trades on NASDAQ under the ticker BLLN.
- Where is BillionToOne headquartered?
- BillionToOne is headquartered in San Francisco, US.








