Senior Stock Plan Administrator

BillionToOne•Menlo Park, CA

55d•$174,068 - $195,826

About The Position

The Senior Stock Plan Administrator is responsible for the day-to-day administration of BillionToOne’s equity compensation program. The role provides hands-on support for equity operations, stock-based compensation accounting, compliance, reporting, and employee communications. The administrator partners with Legal, Payroll, Accounting, People Operations, and external service providers to ensure equity activities are accurate, compliant, and timely. This position reports to the Company’s Controller. The role administers equity plans across their full lifecycle, processes equity transactions, coordinates Employee Stock Purchase Plan enrollment and purchase cycles, reconciles equity balances, and supports month-end and quarterly close activities. It also supports ASC 718 accounting, year-end tax reporting, audit readiness, SOX controls, employee inquiries, and continuous improvement of equity processes and systems.

Requirements

Bachelor’s degree or equivalent experience.
At least 5 years of hands-on experience in equity compensation within a public company.
In-depth knowledge of equity platforms such as Fidelity Plan Sponsor Webstation® or equivalent systems, including end-to-end platform processes.
Strong understanding and experience with multiple types of equity, including ISOs, NSOs, RSUs, and ESPP, and related compliance, tax, and reporting requirements.
Experience supporting internal and external audits and ensuring compliance with SOX and ASC 718.
Experience managing complex reconciliations, close processes, and equity-related financial reporting.
Strong organizational, analytical, and communication skills.
Ability to handle multiple priorities and meet deadlines.
Proficiency in Microsoft Excel, Word, and PowerPoint.

Nice To Haves

A degree in Business Administration, Finance, or Accounting.
Certified Equity Professional (CEP) certification or progress toward certification.

Responsibilities

Maintain accurate equity data and records in equity administration systems and administer equity plans across the full equity lifecycle.
Manage end-to-end processing of equity transactions, including grants, vesting, releases, exercises, and cancellations.
Coordinate Employee Stock Purchase Plan enrollment and purchase cycles, and ensure accurate processing and reconciliations with Payroll and the Fidelity Equity system.
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 equity records, reconciliations, and documentation to support internal and external audit readiness.
Analyze and reconcile equity data, perform audits, and prepare or review month-end journal entries.
Support period-end close activities, including stock-based compensation accounting under ASC 718 and monthly and quarterly close processes, ensuring accuracy in journal entries, accruals, and disclosures.
Ensure compliance with year-end tax reporting requirements.
Partner with Legal, Payroll, Accounting, and People Operations 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 about equity awards, vesting schedules, exercises, and taxation.
Maintain SOX control documentation and complete assigned internal controls documentation.
Respond to auditor requests and inquiries in a timely manner.
Document processes and SOX narratives, and support continuous improvement initiatives.
Identify opportunities to improve equity processes and systems through integration, automation, improved controls, and workflow changes.

Benefits

Multiple medical benefit options, with employee premiums paid at 100% for select plans and dependents covered up to 80%.
Family Bonding Leave of 16 weeks at 100% pay for eligible employees.
Supplemental fertility benefits coverage.
Retirement savings program with a 4% company match.
Paid time off that increases with tenure.
Latest hardware, including laptops, lab equipment, and facilities.
Free daily on-site lunches.
On-campus state-of-the-art gym and restaurant.
Free on-site EV charging.
Annual bonus program.
New-hire equity grant of up to $80,000 at grant value, vesting over four years, plus annual equity refresh grants equal in value to the new-hire grant.
Competitive medical and dental coverage.
Free healthcare options.