BillionToOne
BillionToOne develops molecular diagnostics technology that counts DNA molecules at the single-count level to improve disease detection. The company has raised $426M, most recently in a Series D round in June 2024, and employs 850 people.
The growth story
BillionToOne grew from 101 to 850 employees between 2021 and 2026, raising $426M along the way, most recently a Series D in June 2024.
About
BillionToOne sells precision diagnostic tools that analyze DNA molecules with high accuracy, primarily to healthcare providers and researchers. Its proprietary platform aims to make molecular diagnostics more efficient and accessible.
The company has scaled rapidly, reaching 850 employees, and secured $426M in funding, including a Series D round in June 2024. Its growth reflects strong investor confidence in its molecular counting technology.
Founders and leadership
BillionToOne is led by a team focused on scaling its precision diagnostics platform. Sales is the largest function, with 157 employees, indicating a strong emphasis on commercializing its technology.
The BillionToOne org chart
Oguzhan Atay, PhD (Co-founder and CEO) leads 60 mapped leaders with 4 direct reports. Click +N to expand a team; names link to the person’s public profile.
Departments, and which ones grew
Headcount by function: Research 209 (+31% YoY), Sales 190 (+42% YoY), Healthcare Services 66 (+47% YoY), Operations 58 (+49% YoY), Engineering 48 (+23% YoY), Information Technology 42 (+20% YoY).
Talent flow
BillionToOne recruits heavily from companies like Natera, Invitae, and Myriad Genetics, with 39 hires from each. Its employees often move to Guardant Health, Natera, and Myriad Genetics, suggesting a talent pipeline within the diagnostics industry.
Most common previous employers of BillionToOne staff: Natera (39), Invitae (39), Myriad Genetics (38), Exact Sciences (28), Hologic (24), Progenity (23). Former BillionToOne employees most often moved to Guardant Health (13), Natera (10), Myriad Genetics (5), GeneDx (4), Baylor Genetics (3), Kaiser Permanente (3).
Alumni worth knowing
The BillionToOne mafia
BillionToOne alumni have founded five companies, including CAREX AI, which employs 18 people, and Whimspire Books, a smaller venture with two staff.
5Ozcan Cikmaz, was Mentor until 2018Jack ten Bosch, was Salesforce Administrator/Analyst Intern until 2025Austin So, was Senior Scientist until 2018Brett Huff, was Head Of Engineering (Remote) until 2023Hiring now
Web traffic
Traffic mix: 50% direct, 42% search, 1% social, 1% paid.
What this company is made of
Most common skills at BillionToOne: Leadership (267), Sales (241), Customer Service (227), Microsoft Office (215), Microsoft Excel (194), Communication (190), Research Skills (166), Management (165).
Where the team actually sits
BillionToOne people are concentrated in California, United States (165), San Francisco Bay Area (103), United States (33), Texas, United States (23).
Search footprint
BillionToOne attracts about 6,400 organic search visits a month, traffic worth roughly $17K a month if bought through ads. It gained 1,298 ranking keywords and lost 626 in the last period.
What employees say
- Compensation
- 4.30 / 5
- Career opportunities
- 4.30 / 5
- Senior management
- 4.10 / 5
- Work-life balance
- 3.60 / 5
Frequently asked
BillionToOne has 850 employees as of September 2026.
BillionToOne has raised $426M in total, most recently a Series D round in June 2024.
BillionToOne was founded in 2016 by Oguzhan Atay, PhD.
Oguzhan Atay, PhD (Co-founder and CEO) sits at the top of BillionToOne's reporting structure, with 4 direct reports.
The most common previous employers of current BillionToOne staff are Natera (39 people), Invitae (39 people), Myriad Genetics (38 people).
Former BillionToOne employees most often move to Guardant Health (13), Natera (10), Myriad Genetics (5).
At least 5 companies have a founder who previously worked at BillionToOne, including CAREX AI, Whimspire Books, SiftText.
BillionToOne attracts about 6,400 organic search visits a month, worth roughly $17K a month in equivalent ad spend.
The most common skills among BillionToOne staff are Leadership, Sales, Customer Service, Microsoft Office, Microsoft Excel.
BillionToOne staff are concentrated in California, United States (165), San Francisco Bay Area (103), United States (33).
BillionToOne has about 209 people in Research, up 31% over the past year, as of September 2026.
BillionToOne has about 190 people in Sales, up 42% over the past year, as of September 2026.
Computed from 584 current and 240 former BillionToOne profiles, as of September 2026. Source: Crustdata.
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