Option Pool
What is an option pool?
An option pool (also called an employee stock option pool or ESOP pool) is a portion of a company's fully diluted equity set aside exclusively for future grants to employees, advisors, and contractors. It is established at incorporation or expanded at each funding round. Under IRS Section 422, options granted to employees can qualify as Incentive Stock Options (ISOs) if the plan and grant meet eligibility requirements.
How does option pool sizing work in a funding round?
Investors typically require the pool to be created or topped up before the round closes, and insist it come from the pre-money valuation. This is the option pool shuffle. At a $10M pre-money with a 10% pool requirement, founders' effective pre-money is $9M, the pool absorbs dilution before the investor's capital enters.
| Option pool size | Typical stage |
|---|---|
| 10% | Pre-seed to Seed: covers early hires and advisors |
| 15% | Series A: expanded for engineering, product, and GTM hires |
| 5-10% top-up | Each subsequent round as the pool depletes through grants |
What founders should negotiate
The size is negotiable. A smaller pool means less pre-money dilution. Founders should model actual hiring plans for the next 18 months and size to match, not accept a round number by default. The NVCA model term sheet sets out the standard option pool framework most US counsel negotiate from.
How does the option pool affect price per share in a round?
When an investor requires an option pool to be created or expanded before a round closes, the new shares come from the pre-money side of the cap table, not the post-money. This means the dilution from the option pool expansion is borne entirely by existing shareholders (founders and prior investors), not by the incoming investor. A $10M pre-money valuation on a cap table with 8 million shares becomes a $10M pre-money on a cap table with 10 million shares once a 2 million share option pool is added, reducing the effective price per share from $1.25 to $1.00. The investor gets more shares for the same cheque.
What is the option pool shuffle and why do investors use it?
The option pool shuffle is the practice of requiring founders to create or top up the option pool before a round closes, so the dilution falls on existing shareholders rather than the incoming investor. The shuffle is not illegal or unusual, but founders who understand it can negotiate back on the pre-money valuation to compensate. A $10M pre-money with a 20% post-financing option pool is economically different from a $10M pre-money with a 10% option pool. The NVCA model term sheet does not require a specific option pool size, giving founders room to negotiate. Always model the fully diluted cap table before and after the option pool top-up when evaluating any term sheet.
What do founders get wrong with option pool sizing?
The most common mistake is accepting an investor-proposed option pool size without modelling its effect on founder dilution. Investors typically propose a pool large enough to cover hires for the next 18 to 24 months, which often means 15 to 20 percent of the post-financing fully diluted shares. Founders who agree to a 20 percent pool on a $10M pre-money when they only need 12 percent have accepted 8 percentage points of extra dilution for no reason. Build a hiring plan, calculate the options required for each role, and propose a pool sized to that plan, not the investor's estimate.
A second error is not understanding that ungranted option pool shares are counted in the fully diluted share total that determines price per share. Options that have not been granted to anyone still dilute the founders at the moment the pool is created. Founders should push to create the smallest pool that covers the agreed hiring plan and agree to expand it at the next round if needed.
Third: founders sometimes grant options too quickly after a round closes, awarding large grants to new hires at the post-round 409A strike price without modelling how fast this depletes the pool. A pool that looks sufficient at round close can be exhausted within 12 months if grants are not managed to a budget.
How it works in practice
Case example: Seed-stage B2B SaaS, 8-person team
A workflow automation startup raises a $2M seed round at an $8M pre-money valuation. The lead investor requires a 12% option pool to be in place pre-money. The founder models the next 18 months of hiring: 3 engineers, 1 product manager, 1 sales rep. At an average 0.5% per hire, 5 grants use 2.5% of the pool. The remaining 9.5% sits ungranted.
At close: post-money is $10M. The investor owns 20% ($2M / $10M). The founders' 80% pre-round ownership is now 68%, 12% absorbed by the pool pre-money, then 20% by the investor. The founder who negotiated 10% instead of 12% would have retained 69.6%, a difference of 1.6 percentage points that compounds through future rounds.
Frequently asked questions
Does the option pool dilute the investor?
No. The pool is created pre-money, diluting all existing shareholders including founders before the investor's capital comes in. The investor's ownership is calculated on the post-money cap which already includes the full pool.
What happens to ungranted options if the company is acquired?
Ungranted options typically lapse or are cancelled at acquisition. They do not automatically flow to founders or shareholders unless the acquisition agreement specifically provides for their treatment.
Can the option pool be reduced after it is created?
Yes, with board approval. If the hiring plan changes significantly and the pool is oversized, the board can reduce it, which benefits existing shareholders by shrinking the fully diluted count. This is less common than expanding the pool but is done in some restructurings.
How does the option pool interact with a down round?
In a down round, investors may require the pool to be refreshed at a lower strike price for new grants. This further dilutes existing shareholders. The size and terms of the refresh are negotiating points in the down round term sheet.
Can a company reduce the option pool size after it is created?
Yes, but it requires a board resolution and potentially shareholder approval depending on the governance structure. Unused options that were authorised but never granted can be cancelled, reducing the option pool and returning those shares to the general authorised share pool. Founders who over-sized the pool in a previous negotiation can clean this up before a subsequent round to avoid carrying unnecessary dilution into the next cap table.
Related glossary terms
- Advisory Shares, equity grants for advisors that draw from the same option pool
- Vesting Cliff, the earliest date any option from the pool can vest
- Founders Agreement, the document that governs founder equity before options are granted
Explore related Fintera content
- Fractional CFO for Startups: The 2026 Playbook, how a fractional CFO structures the option pool as part of fundraise preparation
- When to Hire a CFO: 9 Signs It's Time, the trigger signals that indicate when equity complexity warrants senior finance leadership
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