Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
John ten Bosch [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On March 6, 2026, John ten Bosch, our Senior Vice President of Laboratory Operations, entered into a pre-arranged stock trading plan. Such trading plan is intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act. Mr. ten Bosch’s plan provides for, subject to certain market price limits and other terms set forth in the plan, the sale of up to 12,750 shares of Class A common stock between June 15, 2026 and August 28, 2026.
Name	John ten Bosch
Title	Senior Vice President of Laboratory Operations
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	March 6, 2026
Expiration Date	August 28, 2026
Arrangement Duration	74 days
Aggregate Available	12,750,000,000
Nancy Johnson [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On March 6, 2026, Nancy Johnson, our Senior Vice President of Sales and Commercial Operations, entered into a pre-arranged stock trading plan. Such trading plan is intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act. Ms. Johnson’s plan provides for, subject to certain market price limits and other terms set forth in the plan, (a) the sale of up to 29,000 shares of Class A common stock, and (b) the exercise of up to 30,000 stock options and sale of the underlying shares of Class A common stock, between June 8, 2026 and August 31, 2026.
Name	Nancy Johnson
Title	Senior Vice President of Sales and Commercial Operations
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	March 6, 2026
Expiration Date	August 31, 2026
Arrangement Duration	84 days
Shan Riku Sakakibara [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On March 6, 2026, Shan Riku Sakakibara, our Chief Product Officer, entered into a pre-arranged stock trading plan. Such trading plan is intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act. Ms. Sakakibara’s plan provides for, subject to certain market price limits and other terms set forth in the plan, (a) the sale of up to 20,000 shares of Class A common stock, and (b) the exercise of up to 8,000 stock options and sale of the underlying shares of Class A common stock, between June 8, 2026 and August 31, 2026.
Name	Shan Riku Sakakibara
Title	Chief Product Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	March 6, 2026
Expiration Date	August 31, 2026
Arrangement Duration	84 days
David Tsao [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On March 6, 2026, David Tsao, our President, Chief Technology Officer and Director, entered into a pre-arranged stock trading plan. Such trading plan is intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act. Mr. Tsao’s plan provides for, subject to certain market price limits and other terms set forth in the plan, the exercise of up to 60,000 stock options and sale of the underlying shares of Class A common stock, between June 15, 2026 and August 28, 2026.
Name	David Tsao
Title	President, Chief Technology Officer and Director
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	March 6, 2026
Expiration Date	August 28, 2026
Arrangement Duration	74 days
Aggregate Available	60,000,000,000
Oguzhan Atay [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On March 6, 2026, Oguzhan Atay, our Chief Executive Officer and the Chair of our Board of Directors, entered into a pre-arranged stock trading plan. Such trading plan is intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act. Mr. Atay’s plan provides for, subject to certain market price limits and other terms set forth in the plan, the exercise of up to 120,000 stock options and sale of the underlying shares of Class A common stock, between June 8, 2026 and August 21, 2026.
Name	Oguzhan Atay
Title	Chief Executive Officer and the Chair of our Board of Directors
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	March 6, 2026
Expiration Date	August 21, 2026
Arrangement Duration	74 days
Aggregate Available	120,000,000,000
Nancy Johnson, Common Stock Trading Arrangement [Member] \| Nancy Johnson [Member]
Trading Arrangements, by Individual
Aggregate Available	29,000,000,000
Nancy Johnson, Stock Options Trading Arrangement [Member] \| Nancy Johnson [Member]
Trading Arrangements, by Individual
Aggregate Available	30,000,000,000
Shan Riku Sakakibara, Common Stock Trading Arrangement [Member] \| Shan Riku Sakakibara [Member]
Trading Arrangements, by Individual
Aggregate Available	20,000,000,000
Shan Riku Sakakibara, Stock Option Trading Arrangement [Member] \| Shan Riku Sakakibara [Member]
Trading Arrangements, by Individual
Aggregate Available	8,000,000,000

BillionToOne, Inc. 10-Q