Company: BLLN
Filing Date: 2025-10-17
Form Type: S-1/A
Source: 0001193125-25-242632
Chunk: 270

Company: BillionToOne, Inc.
Filing Date: 2025-10-17
Form: S-1/A
Chunk 270
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 since May 2024. Mr. Rai is a professional investor with over 18 years of experience investing
in public and private equities, with a focus on healthcare and life sciences. He currently leads U.S. healthcare investments for Premji Invest, investing in growth stage private companies. Mr. Rai has been with Premji Invest since July 2010 and
helped establish the U.S. healthcare investments practice for the firm, which includes investments in companies like Moderna, Devoted Health and Iora Health, among others. Prior to joining Premji Invest, Mr. Rai was part of the equity research
team at Citigroup in India.

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Mr. Rai holds a bachelor of engineering degree from National Institute of Technology Karnataka and an MBA from the Indian Institute of Management Bangalore. We believe that Mr. Rai is qualified to serve on our Board of Directors because of his investment experience with both private and public healthcare companies. Family relationships There are no family relationships among any of our executive officers or directors. Board composition After the completion of this offering, the number of directors will be fixed by our Board of Directors, subject to the terms of our Post-IPOCertificate of Incorporation and Post-IPOBylaws as each are in effect after this offering. Each of our current directors will continue to serve as a director until the election and qualification of his or her successor, or until his or her earlier death, resignation, or removal. In accordance with the terms of our Post-IPOCertificate of Incorporation and Post-IPOBylaws that will be effective immediately prior to the completion of this offering, our Board will be divided into three classes, Class I, Class II, and Class III, with members of each class serving staggered three-year terms. Effective immediately prior to the completion of this offering, our Board will be divided into the following classes:

| • |     | Class I, which will consist of Oguzhan Atay and Akshay Rai, whose terms will expire at our first annual meeting of 
 stockholders to be held after the completion of this offering;                                                     |

| • |     | Class II, which will consist of David Tsao and Thomas Bremner, whose terms will expire at our second annual meeting of 
 stockholders to be held after the completion of this offering; and                                                     |

| • |     | Class III, which will consist of Firat Ileri and Krishna Swaroop Kolluri, whose terms will expire at our third annual 
 meeting of stockholders to be held after the