BillionToOne (BLLN) Proxy filing summary

Executive summary

• The 2026 Annual Meeting will be held virtually on June 10, 2026, with voting available online, by phone, or by mail.

• Stockholders will vote on electing two Class I directors and ratifying the appointment of PricewaterhouseCoopers LLP as the independent auditor for 2026.

• The company has a dual-class share structure, with Class B shares carrying 15 votes per share and Class A shares carrying one vote per share.

• Proxy materials and the 2025 Annual Report are available online, with an emphasis on reducing environmental impact through electronic delivery.

Voting matters and shareholder proposals

• Two directors, Oguzhan Atay and Akshay Rai, are nominated for election as Class I directors for a three-year term expiring in 2029.

• Stockholders are asked to ratify PricewaterhouseCoopers LLP as the independent auditor for 2026.

• The board recommends voting FOR both proposals.

• Procedures for submitting shareholder proposals and director nominations for the 2027 meeting are detailed, with deadlines and requirements specified.

Board of directors and corporate governance

• The board consists of seven members divided into three staggered classes, with a mix of executive and independent directors.

• The board is chaired by the CEO, with a lead independent director appointed.

• Audit and Compensation Committees are fully independent and comply with Nasdaq and SEC requirements.

• The board held nine meetings in 2025, with all directors attending at least 75% of meetings.