BillionToOne
BillionToOne is a precision diagnostics company based in Menlo Park, California, founded in 2016. With a team of around 300 employees, the company aims to enhance molecular diagnostics by making them more accurate, efficient, and accessible. Their proprietary technology, Quantitative Counting Templates (QCTs™), allows for the detection and measurement of disease-related DNA fragments at single base-pair resolution, significantly improving prenatal screening and liquid biopsy applications. The company's flagship product, UNITY™ Screen, is a noninvasive prenatal test that analyzes fetal cell-free DNA from a maternal blood sample, assessing risks for various genetic conditions and chromosomal aneuploidies. BillionToOne also offers UNITY Complete®, which combines multiple screening options into one test. In oncology, they provide liquid biopsy tests like Northstar Select™ and Northstar Response™ to help determine cancer treatment and monitor therapy effectiveness. Additionally, they have developed a COVID-19 test, showcasing their technology's versatility. BillionToOne serves pregnant patients, oncology patients, and clinical research organizations, and has experienced significant growth and recognition in the diagnostics field.
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Headcount trend
BillionToOne went from 446 employees in Oct 2024 to 759 in Sep 2026. Apr to Sep 2026: 107 people joined, 22 left.
Org structure
Headcount by department
H-1B sponsorship
The department split adds up all the years listed above. FY2026 alone: 9 filings.
Funding
- Jun 2024 · Series D · $130M · Premji Invest, Neuberger Berman, Adam Street Partners
- Dec 2022 · Series C · $48M · Libertus Capital, Hummingbird Ventures, Baillie Gifford
- Dec 2022 · Debt Financing · $35M · Libertus Capital, Hummingbird Ventures, Baillie Gifford
- Mar 2022 · Series C · $125M · Adams Street Partners, Hummingbird Ventures, Baillie Gifford
- Jun 2021 · Series B · $55M · Hummingbird Ventures, Four Rivers Group, Neotribe Ventures
- Mar 2020 · Series A · $15M · Hummingbird Ventures, NeoTribe Ventures, Y Combinator
- Mar 2019 · Series A · $15M · Hummingbird Ventures, NeoTribe Ventures, Y Combinator
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Hiring now
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$56k - $64k
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$136.9k - $163.3k
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$76.2k - $87.0k
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$202.7k - $202.7k
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$174.1k - $206.7k
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$300k - $300k
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$174.1k - $184.9k
Base Salary:
$170.9k - $186.9k
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BillionToOne FAQ
How many employees does BillionToOne have?
BillionToOne has about 759 employees, up 1.7% over the 3 months to Sep 2026.
Does BillionToOne sponsor H1B visas?
Yes. BillionToOne filed 9 H1B (LCA) applications in FY2026, according to the latest U.S. Department of Labor disclosures. Most of them were for Engineering roles.
What is BillionToOne's revenue per employee?
BillionToOne makes about $202K in revenue per employee, based on $153M annual revenue and 759 employees.
How much funding has BillionToOne raised?
BillionToOne has raised $423M in total funding; its latest round was Series D in Jun 2024.
Data from Company Prospectus, DOL LCA disclosures, WARN notices and 6figr salary profiles.