Fundraising Fox

BillionToOne

NASDAQ: BLLNYC S17

San Francisco, US · Founded 2016 · 300 employees · Public · Hiring · 22 known investors

Find your way into BillionToOne

9 people in our graph share verified history with the BillionToOne team — schools, employers, funds. One of them is your warm intro.

Shahram Seyedin-Noorunlockedknows Oguzhan Atay · together at BillionToOne
×8knows the team · via BillionToOne

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.

BiotechDigital HealthHealthtechMedical DevicesDiagnosticsGenomicsUnited States of AmericaAmerica / CanadaPartly Remote

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.

OA
Oguzhan Atay, PhDinCo-Founder, CEO, and Board ChairHe completed his PhD as a graduate fellow in Stanford University's Department of Biology, following earlier research work at the University of Oxford. He co-founded the company in 2017 and has led it since.
DTDavid Tsao, PhD
David Tsao, PhD𝕏Co-Founder, CTO, and Board MemberCo-founder & CTO of BillionToOne
OAOguzhan Atay
Oguzhan AtayinFounderCo-founder & CEO of BillionToOne
DTDavid Tsao
David Tsaoin𝕏Founder/CTOCo-founder & CTO of BillionToOne
SSSukrit Silas
Sukrit SilasinCo-founder, Chief Science Officer2016–201830 Under 30 2019

Investors · 22

500 Emerging EuropeAmsterdam
500 GlobalSan Francisco · $150K
Asymmetry VenturesRichmond · $125K – $500Kvia Rob Ness · inferred
Civilization Ventures Management, LlcTiburon · $1M – $10M
e2vc
Fifty YearsSan Francisco · $250K – $2M
FrialeNashville · $100K – $600Kvia Bryan Frist · inferred
Hemisphere Ventures LLCMckinney
HOF CapitalNew York · $25K – $15M
Hummingbird VenturesSingapore · $500K – $10M
MetaplanetTallinn · $500K – $10M
Neotribe VenturesMenlo Park · $250K – $2M
Norwest Venture PartnersMenlo Park · $10M – $30M
Oberland CapitalNew York · $50M – $300M
Premji InvestMenlo Park
Standard CapitalSan Francisco
Start Capital
Time BioVenturesSouthern California
Toba CapitalIrvine · $1M – $10M
UpHonest CapitalSilicon Valley · $50K – $1M
Y CombinatorSan Francisco · $500K
Lombardstreet VenturesreportedWoodside · $500K

Funding

SEC filings, press & company announcements

Source: company announcements and press reports — follow each round's link for the claim.

Founder mafia

3 people who came through BillionToOne went on to found or lead other companies.

Doktor GursonInvestor/AdvisorFounded Doblet +1Shahram Seyedin-NoorSeed-to-Scale Investor → IPOFounded InspirnaSonia SetayeshSeed-to-Scale Investor → IPOFounded Inspirna

Competitors · 3

by search overlap
Labcorp113 shared keywordsLabCorp provides diagnostic testing services and clinical trial recruitment solutions that connect patient insights to drug development for healthcare providers.
Natera59 shared keywordsNatera develops genetic tests and diagnostics using cell-free DNA technology to detect diseases including cancers, genetic disorders, and transplant-related conditions. The company serves patients, physicians, and healthcare systems across oncology, women's health, and organ health.
Quest Diagnostics50 shared keywordsQuest Diagnostics is the world's leading provider of diagnostic information services, serving one in three adult Americans and half of US physicians and hospitals. The company offers diagnostic insights and testing services to consumers and healthcare providers to support health decision-making.

Companies 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
AgencyPhaseYearAmount
National Institutes of Health (NIH)National Institutes of HealthPhase I2018$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

BillionToOne CPO Sakakibara Shan Riku sells $1m in company stock By Investing.cominvesting.com · Jul 2026BillionToOne SVP sells $169,920 in stock By Investing.comca.investing.com · Jul 2026Guggenheim raises BillionToOne stock price target to $120 on reimbursement progress By Investing.cominvesting.com · May 2026DNA test maker BillionToOne raises $314M in IPO, shares take a quick dipfiercebiotech.com · Nov 2025Hippocratic AI raises $126M, Hack The Box partners with LinkedIn Learning, BillionToOne goes public - VatorNewsvator.tv · Nov 2025BillionToOne raises $273.1 million in upsized IPO By Investing.cominvesting.com · Nov 2025Molecular diagnostics firm BillionToOne raises $273 million in US IPO | Reutersreuters.com · Nov 2025Molecular Diagnosis Firm BillionToOne Raises $273 Million in IPO - Bloombergbloomberg.com · Nov 2025

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.