Company: BLLN
Filing Date: 2025-08-11
Form Type: DRS/A
Source: 0000950123-25-007483
Chunk: 244

Company: BillionToOne, Inc.
Filing Date: 2025-08-11
Form: DRS/A
Chunk 244
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 of Sales and Commercial Operations.
Ms. Johnson brings more than 20 years of diagnostic sales leadership experience in both start-up and large-scale sales organizations. Most recently, Ms. Johnson played a key role in commercial
strategy and execution at Foundation Medicine, a publicly traded molecular information company, that was acquired by Roche during her tenure. Prior to Foundation Medicine, she held several commercial leadership positions at various molecular
diagnostic companies. Ms. Johnson started her career as a board-certified Medical Technologist and earned a B.S. in medical technology from Creighton University.

John ten Bosch joined BillionToOne in September 2020 as our Laboratory Director and has since been promoted multiple times, most recently to the role of
Senior Vice President of Laboratory Operations. Dr. ten Bosch brings over 15 years of experience leading high-complexity CLIA laboratories, with expertise in regulatory oversight,

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clinical laboratory operations, and test development. Prior to joining BillionToOne, he worked at Kaiser Permanente from 2012 to 2020, where he served as both Laboratory Director and Director of
Quality for the Molecular Pathology and Cytogenetics laboratories. Dr. ten Bosch graduated magna cum laude from the University of California, Davis with a B.S. in Genetics. He earned his Ph.D. in Molecular and Cell Biology from the University
of California, Berkeley, and completed postdoctoral fellowships at Stanford and UCLA.

John Lister joined BillionToOne in July 2025 as our Chief
Administrative Officer. Prior to joining BillionToOne, Mr. Lister served as Chief Operating Officer of the Tidepool Project, a diabetes software company, from June 2022 through June 2025. From January 2020 through January 2023, Mr. Lister provided
strategic commercial, corporate finance and legal advice to companies in the healthcare space, including Tandem Diabetes, Zoe Global, WaveForm Diabetes and Candid Dental. Previously, Mr. Lister worked for Dexcom, Inc., a publicly-traded producer of
continuous glucose monitoring systems, from 2008 to 2019. Mr Lister served in various executive positions at Dexcom, including as General Counsel & Head of Human Resources from 2008 to 2015, and as General Manager for Dexcom’s
International business from 2015 to 2019. Mr. Lister began his career as an attorney at Fenwick & West LLP. Mr. Lister earned a B.A. in government and literature from Claremont McK