What Is an Option Pool?
An option pool, also called an employee stock option pool or equity incentive plan, is a set of authorized shares set aside for compensating the people who build a company. Startups cannot match large-company cash salaries, so they offer stock options that let employees buy shares at a fixed strike price and share in the upside if the company succeeds. The pool defines how much equity is available to grant.
Pools are created when a company incorporates or raises its first priced round and are refreshed as the company grows. At a typical venture-backed startup the unallocated pool sits around 10% to 20% of fully diluted shares after a financing. Grants from the pool usually vest over four years with a one-year cliff, meaning an employee who leaves within the first year forfeits the entire award.
How Option Pools Affect the Cap Table
Every share added to the pool dilutes existing holders, and the key negotiation is who absorbs that dilution. Venture investors almost always require the pool to be created or topped up before their money comes in, calculated on the pre-money valuation. This practice, often called the option pool shuffle, pushes the dilution onto founders and prior investors rather than the new money.
Consider a term sheet offering a $6 million pre-money valuation with a $2 million investment and a requirement that a 20% option pool exist at closing. The pool equals 20% of the $8 million post-money, or $1.6 million of value, carved out of the pre-money. The founders' effective pre-money valuation is really $4.4 million, which is why sophisticated founders negotiate pool size using a bottom-up hiring plan instead of accepting a round number.
Why the Option Pool Matters
The option pool determines how much ownership a startup can offer recruits, which directly shapes its ability to hire. Early engineers might receive grants of 0.1% to 1% of the company, while a vice president or C-level executive can command 1% to 3%. A pool that is too small forces a mid-cycle refresh and extra dilution, while an oversized pool needlessly reduces founder and investor ownership.
For anyone recruiting into venture capital or evaluating a startup job offer, pool mechanics are essential. Investors model the pool when calculating price per share and returns, and employees should ask how many fully diluted shares are outstanding before judging whether an option grant is generous. Interviewers often test the option pool shuffle math because it reveals whether a candidate truly understands pre-money versus post-money valuation.
