An option pool (also called an ESOP — Employee Stock Option Pool) is a percentage of a company's shares set aside for granting stock options to employees, advisors, and sometimes consultants. It is one of the most important — and frequently misunderstood — elements of startup fundraising.
How option pools work
- The company's board authorizes a specific number of shares for the pool
- Individual employees receive stock option grants from this pool, giving them the right to purchase shares at a fixed strike price (set by a 409A valuation)
- Options typically vest over 4 years with a 1-year cliff, meaning the employee earns 25% after year one and the remainder monthly or quarterly
The option pool shuffle
This is a critical concept for founders. When a VC requires a 15% option pool as part of a Series A, that pool is almost always created from the pre-money valuation, which means:
- It dilutes the founders' ownership, not the investors'
- A "$20M pre-money" with a 15% option pool effectively values the existing shares at $17M (since $3M of the pre-money is allocated to unissued options)
- This is sometimes called the option pool shuffle and is a hidden source of founder dilution
Typical pool sizes
- At incorporation: 10–15% is standard
- Series A: investors typically require a 10–20% unallocated pool, which may require a top-up
- The right size depends on hiring plans — enough to attract key hires for the next 18–24 months
2026 equity compensation benchmarks
Typical option grants as a percentage of fully diluted shares:
- VP of Engineering (early stage): 1–2%
- Senior engineer (employee #5–15): 0.25–0.75%
- Senior engineer (employee #50+): 0.05–0.15%
- Advisors: 0.1–0.5% with 2-year vesting
Negotiation tips for founders
- Right-size the pool based on a bottoms-up hiring plan — push back on arbitrary "20% pools" that exceed your needs
- Allocate from post-money if possible (rare but negotiable)
- Track pool utilization carefully — an overly large unallocated pool is wasted dilution