Senior Stock Plan Administrator

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About the role

A Rare Opportunity to Shape the Future of Genomics Join a team of brilliant, passionate innovators determined to transform healthcare. At BillionToOne, we've built a category-defining, publicly traded company on Nasdaq where transparency fuels trust, collaboration drives breakthroughs, and every contribution moves the needle on our mission to make life-changing diagnostics accessible to all. We don't just aim for incremental improvements; we build products that are 10x better than anything that exists today. Our scientists, engineers, sales executives, and visionaries are united by an unwavering commitment to changing the standard of care in prenatal and cancer diagnostics. This is where cutting-edge science meets human compassion, and every innovation you contribute helps remove the fear of the unknown from some of life's most critical medical moments. If you're driven by purpose, energized by innovation, and ready to help shape the future of precision medicine at scale, this is where you belong. The Senior Stock Plan Administrator is responsible for the day-to-day administration of the Company's equity compensation program. This role provides hands-on support for equity operations, stock-based compensation accounting, compliance, reporting, and employee communications. The ideal candidate will partner closely with Legal, Payroll, Accounting, People Operations, and external service providers to ensure accurate, compliant, and timely execution of all equity-related activities. This position will report to the Company’s Controller. Responsibilities: Equity Administration and Operations • Maintain accurate equity data and records within equity administration systems and administer equity plan across the full equity lifecycle. • Manage the end-to-end processing of equity transactions (grants, vesting, releases, exercises, cancellations, etc.) in the equity system. • Coordinate Employee Stock Purchase Plan (ESPP) enrollment and purchase cycles and ensure accurate processing and reconciliations in collaboration with Payroll and Fidelity Equity system. Compliance and Reporting • Maintain and reconcile equity share pool balances; perform monthly reconciliations of shares outstanding and reserves with the transfer agent. • Assist with equity plan setup, maintenance, and governance. • Maintain accurate records and equity reconciliations and documentation to support internal/external audit readiness. • Analyze and reconcile equity data, perform audits, and prepare / review all month-end journal entries. • Support period-end close activities including stock-based compensation (SBC) accounting in accordance with ASC 718 and completing monthly and quarterly stock-based compensation close processes, ensuring accuracy in journal entries, accruals, and disclosures. • Responsible for compliance with year end tax reporting requirements. Collaboration with Business Partners • Partner with Legal, Payroll, Accounting, and PeopleOps teams to ensure accurate, compliant, and timely execution of equity processes. • Assist Payroll teams with equity reporting, tax compliance and reconciliation activities. • Respond to employee inquiries regarding equity awards, vesting schedules, exercises, and taxation. Audit and SOX Compliance • Maintain accurate records and documentation to support audit readiness. • Maintain SOX control documentation and perform assigned internal controls documentation to support SOX compliance. • Respond to auditor requests inquiries in a timely manner. Process Improvement • Document processes, SOX narratives and support continuous improvement initiatives. • Identify opportunities to enhance equity processes and systems through integration and automation, improved controls, and workflow changes. Qualificatio

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