Definition
An employee stock option pool is an allocation of a company's equity that is set aside for future equity-based compensation.
Startups commonly establish an option pool before or during fundraising so they can grant equity to current and future employees without negotiating a new ownership allocation for every individual hire.
The pool is typically represented in the company's capitalisation records and can affect founder and investor ownership percentages, particularly when it is created or increased as part of a financing.
Why do startups create an option pool?
Startups commonly use equity compensation to:
Attract employees
Retain key talent
Align employee incentives with long-term company value
Compensate for limited cash salaries
Provide equity to future hires
The pool gives the company a defined amount of equity that can be allocated over time.
How does an option pool work?
Suppose a startup has:
1,000,000 existing shares
and establishes an employee option pool of:
100,000 options
The pool represents:
100,000 ÷ 1,100,000 ≈ 9.1%
of the resulting fully diluted share count, assuming the pool is newly created and no other securities are involved.
The company can then grant options from the pool to eligible employees.
Option pool vs. individual stock options
These are different.
Option pool:
The overall equity allocation reserved for future grants.
Stock option:
An individual grant giving a particular person the right to acquire shares under specified conditions.
For example:
Company: 100,000-option pool
Employee A: 10,000 options
Employee B: 5,000 options
The remaining pool would contain 85,000 unallocated options, assuming no other changes.
Option pool and dilution
Creating an option pool can affect existing shareholders because additional potential shares are added to the company's capitalisation.
Suppose founders own 100% of a company before an option pool is created.
If a 10% pool is established through new equity allocation, the founders' percentage can fall to approximately 90% on the relevant fully diluted basis.
The precise effect depends on how the pool is structured and the capitalisation definition used in the transaction.
Option pools and fundraising
Option pools are frequently discussed during venture financing negotiations.
An investor may want the company to have sufficient equity available for future hiring.
For example, an investor agrees to invest $2 million but expects the company to establish a 10% employee option pool before the financing.
Whether that pool is included in the pre-money or post-money capitalisation can materially affect how the resulting dilution is distributed between existing shareholders and the new investor.
This is an important financing term that should be modelled rather than evaluated from the headline investment percentage alone.
Who receives options from the pool?
Depending on the company's equity plan and applicable law, recipients can include:
Employees
Executives
Founders in some circumstances
Directors
Consultants or advisers, where permitted
Eligibility depends on the company's plan, corporate structure, and jurisdiction.
How large should an option pool be?
There is no universal percentage that applies to every startup.
The appropriate size depends on:
Current headcount
Planned hiring
Company stage
Expected growth
Existing equity grants
Fundraising plans
Investor expectations
Local legal and tax considerations
A company should generally model the expected hiring requirements rather than choosing a percentage without considering its actual needs.
Option pool vs. options granted
An option pool is not necessarily fully allocated.
For example:
Option pool: 200,000 options
Granted: 120,000
Unallocated: 80,000
The unallocated portion remains available for future grants, subject to the company's equity plan and applicable approvals.
Option pool and vesting
Options granted from the pool are often subject to vesting conditions.
A company might grant an employee:
20,000 options
with a four-year vesting schedule.
The employee does not necessarily receive the full economic benefit immediately. The options generally become exercisable progressively as they vest, subject to the terms of the grant.
Option pool and the cap table
A cap table can distinguish between:
Issued shares
Outstanding options
Unallocated option pool
Other potential equity
This allows founders and investors to understand both current ownership and potential future dilution.
For example:
Category | Shares / Options |
|---|---|
Founder shares | 700,000 |
Investor shares | 200,000 |
Granted employee options | 50,000 |
Unallocated option pool | 50,000 |
Fully diluted total | 1,000,000 |
The exact presentation varies by cap-table methodology.
→ Cap Table
Example
A startup has:
800,000 founder shares
200,000 investor shares
100,000 employee options reserved or granted
Its relevant fully diluted capitalisation is:
1,100,000
The founders' fully diluted ownership is:
800,000 ÷ 1,100,000 ≈ 72.7%
The investor owns:
200,000 ÷ 1,100,000 ≈ 18.2%
The employee pool represents:
100,000 ÷ 1,100,000 ≈ 9.1%
This illustrates why the option pool must be considered when evaluating ownership.
Common misconception
An employee option pool means employees already own that percentage of the company.
No.
An option pool is generally reserved equity for potential future grants.
An employee who has not received an option grant does not automatically own the unallocated pool.
Even after an option is granted, the holder may need to satisfy vesting conditions and exercise the option before acquiring the underlying shares.
