Option Pool and ESOP

What Is an Option Pool?

An option pool — often called an Employee Stock Option Pool (ESOP) — is a portion of a startup's total equity reserved for future grants to employees, advisors, consultants, and key contributors. Rather than paying entirely in cash, startups use equity grants from the option pool to attract and retain talent who might otherwise choose safer employment at larger companies. The equity stake gives employees a direct financial incentive to grow the company's value over time.

At its core, an option pool is a promise: stay, contribute to the company's success, and you will share in the financial outcome. For startups that cannot yet compete on salary alone, this is often the most powerful recruitment tool available.

How the Option Pool Works

An employee or advisor who receives a grant from the option pool does not immediately own shares. Instead, they receive stock options — the right to purchase a specified number of shares at a fixed price (the exercise price or strike price) after a defined vesting period.

The exercise price is typically set at the fair market value of the shares on the date of grant. Because the company's share price is expected to rise as it grows, the employee can later exercise their options at the lower historical price and benefit from the appreciation. In the US, a 409A valuation is used to determine fair market value for this purpose. In Singapore and other SEA markets, an independent valuation or board-approved price is typically used.

If the employee leaves before their options fully vest, unvested options are forfeited and returned to the unallocated option pool for future grants.

Vesting Schedules and the Cliff

Vesting schedules govern when an employee earns their options. The industry standard across most markets is a four-year vesting period with a one-year cliff:

• Year 0–1 (Cliff period): No options vest. This protects the company from dilution caused by early departures. If an employee leaves before the one-year mark, they receive nothing.
• End of Year 1 (Cliff vesting): 25% of total options vest in one tranche on the one-year anniversary.
• Years 2–4 (Monthly vesting): The remaining 75% vest proportionally each month — approximately 2.08% of the total grant per month — over the following 36 months.

A four-year vesting schedule with a one-year cliff is the dominant structure globally and is the recommended baseline for SEA startups.

Some companies use back-loaded vesting (less in early years, more in later years) to incentivise longer tenure. Performance-based vesting, which ties option grants to achieving specific company milestones, is uncommon at early-stage companies but more frequent at later stages where milestones are measurable.

Option Pool Sizing

Option pool size is expressed as a percentage of the total fully diluted share count. Common sizing guidelines:

• Early-stage (pre-seed to Seed): 10–15% of fully diluted shares is the most common range. Approximately 80% of startups offer some form of equity compensation to employees.
• Series A refresh: Investors frequently require an option pool top-up to 10–15% post-money at Series A to support the hiring plan over the next 18–24 months.
• Growth stage: Option pools may reach 15–20% as the company scales its headcount significantly.

Option pool sizing should be driven by your actual hiring plan, not by a generic rule of thumb. Build a bottom-up model: identify the roles you need to fill over the next 18 months, estimate the equity percentages each role requires (based on market benchmarks), and size your pool accordingly.

The Option Pool Trap: Pre-Money vs Post-Money Timing

One of the most impactful but least understood aspects of option pool negotiations is the timing of when the pool is established relative to a new investment.

When investors require the option pool to be set up pre-money (before their investment is counted), the dilution from creating the pool falls entirely on existing shareholders (founders and previous investors) — not on the incoming investor. The investor's ownership percentage is calculated against the post-pool, pre-investment share count.

When the option pool is set up post-money (after the investment), the incoming investor shares the dilutive burden proportionally.

Pre-money option pools can cost founders 3–7% more dilution than they expect. Always model both scenarios before accepting term sheet terms around the option pool.

Post-Termination Exercise Window

When an employee leaves the company, they typically have a limited window — often 90 days — within which they must exercise their vested options or lose them. This is a significant practical challenge: exercising options requires paying the exercise price in cash, which may not be possible for employees who do not have personal liquidity.

Some founder-friendly companies extend the exercise window to 1–5 years after departure, or even longer. This is considered more equitable and is increasingly common among transparency-focused startups.

Good Leavers and Bad Leavers

ESOPs should clearly define good leaver and bad leaver provisions:

• Good leavers (departing on good terms, e.g., resignation, redundancy, health) typically retain their vested options and may have accelerated vesting in some agreements.
• Bad leavers (departing due to misconduct, breach of contract) may forfeit all options, including vested ones, at the company's discretion.

These provisions protect the company's equity from being held by former employees who departed on poor terms, while ensuring genuine contributors are treated fairly.