Company: BLLN
Filing Date: 2025-06-20
Form Type: DRS
Source: 0000950123-25-006095
Chunk: 216

Company: BillionToOne, Inc.
Filing Date: 2025-06-20
Form: DRS
Chunk 216
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has been a member of our Board of Directors 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. 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-IPO Certificate of Incorporation and
Post-IPO Bylaws as each are in effect after this

171

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     , 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     , 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     , whose terms will expire at our third