Company: BLLN
Filing Date: 2025-08-11
Form Type: DRS/A
Source: 0000950123-25-007483
Chunk: 242

Company: BillionToOne, Inc.
Filing Date: 2025-08-11
Form: DRS/A
Chunk 242
---
 Board of Directors. Dr. Atay received his PhD in Biology from Stanford University, where his work was published on the cover of Cell Systems. He graduated summa cum laude and Phi Beta Kappa from Princeton University with a bachelor’s in molecular biology and minors in physics, computer science, and applied mathematics. We believe that Dr. Atay is qualified to serve on our Board of Directors because of his experience as our co-founderand Chief Executive Officer, his co-developmentof our molecular counting platform, and his extensive knowledge of the precision diagnostics industry. David Tsaois our President, Chief Technology Officer and Co-Founder,having been with the Company since its inception in 2016, and also serves as a member of our Board of Directors. Dr. Tsao oversees all technology developments at BillionToOne. He received a PhD in bioengineering from Rice University, where he was awarded a nanobiology training fellowship. He graduated cum laude from Princeton University with a bachelor’s in physics and minors in biophysics and engineering management systems. While at Princeton, he was twice awarded the Shenstone Prize in physics. We believe that Dr. Tsao is qualified to serve on our Board of 186

Directors because of his co-development of our molecular counting platform, extensive technical expertise in molecular biology, and deep knowledge of the
precision diagnostics industry.

Ross Taylor has served as our Chief Financial Officer since January 2024, bringing three decades of financial
leadership to the Company. Prior to joining BillionToOne, Mr. Taylor was Chief Financial Officer for Codexis, Inc., a publicly traded enzyme engineering company, from 2019 to February 2023. Previously, he served as Chief Financial Officer of
Abaxis, Inc., a publicly traded medical technology company, acquired by Zoetis for $2.0 billion. At Abaxis, he first held the role of Vice President of Business Development & Investor Relations from 2014 to 2015, before being appointed
CFO from August 2015 through the company’s successful acquisition in July 2018. Early in his career, Mr. Taylor spent more than a decade as an equity research analyst at leading Wall Street firms including CL King & Associates,
UBS, Smith Barney, and CJ Lawrence, providing deep expertise in capital markets and strategic financial planning. Mr. Taylor holds an MBA from Columbia Business School and a B.A. in economics from Duke University.

Shan Riku Sakakibara joined BillionToOne in 2019 as one of our first