Mobius
Intermediate

What is Option pool

Also known as: employee option pool, ESOP pool

Option pool build-up

62%23%10%

Shareholders

Founders62%
Seed investors23%
Option pool10%
Advisors5%

The gold slice is the option pool: ownership reserved in advance for future employees.

Definition

A block of company shares set aside for future employees, advisors, and consultants to align their incentives with company growth. Allocated as common stock, it helps attract and retain top talent.

An allocation of common stock reserved by a company for issuance under an employee stock option plan to attract and retain talent.

Why it matters

An option pool is key for hiring top talent when cash is limited. However, founders must realize that an option pool represents real dilution. Because it is usually created from the pre-money valuation, the dilution falls entirely on the founders rather than the new investors.

Directly related: Equity, Dilution, Vesting.

Improvement tips

  • Calculate the size of the option pool based on your specific hiring plan for the next twelve to eighteen months.
  • Negotiate the option pool size as part of the term sheet to avoid unnecessary pre-money dilution of founder shares.
  • Explain the value of stock options to prospective hires by showing the potential value of their percentage at future milestones.

Common mistakes

  • Creating an excessively large option pool that dilutes the founders more than necessary before actual hiring occurs.
  • Assuming that options do not dilute existing shares until they are actually granted to employees.
  • Failing to specify that unused options in the pool should return to the general share reserve if the company is acquired.

Related terms

StartupsBeginner

Equity

Ownership interest in a company, represented by shares or stock, which defines a person's share of control, risks, and financial returns. It is calculated as total assets minus total liabilities.

StartupsIntermediate

Dilution

The decrease in the ownership percentage of existing shareholders when a company issues new shares of stock. It reduces ownership share and voting power for all existing stockholders.

StartupsIntermediate

Vesting

The process by which an employee or founder earns full ownership of their shares or stock options over a set period of time. Rights accrue over time or upon reaching milestones, tied to service.

StartupsIntermediate

Pre-money

The valuation of a company before it receives a new round of investment. It is the agreed value before new capital arrives, and it determines the price per share.

From the blog

Early-Stage Fundraising: What Investors Need to See

How founders can prepare for early fundraising with clearer milestones, traction evidence, dilution thinking, and investor-ready answers.

What Is Equity in Business?

Plain-language equity basics for founders, partners, early employees, and investors, including cap tables, dilution, options, and rights.

Quick check

Who absorbs the dilution when an option pool is created during an investment round?

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Frequently asked questions

Do I need to set up an option pool before I launch my startup?
No, you do not need to create one immediately. You should set up an option pool only when you are preparing to hire your first employees or when required by investors during a funding round.
When does an option pool first become relevant for a new business?
It becomes relevant when you need to attract high-quality talent but cannot afford to pay competitive cash salaries. Offering options lets you compensate team members with future equity instead.
How big should my startup's option pool be in the beginning?
A standard option pool size is ten to fifteen percent of the company's total shares. You should base the exact size on your specific hiring plan for the next twelve to eighteen months, rather than using a default guess.
Does creating an option pool affect my ownership percentage as a founder?
Yes, creating an option pool dilutes your ownership because it reserves a block of shares that comes out of the pre-money valuation. Investors usually require this pool to be created before they invest, placing the dilution entirely on the founders.
Why does my option pool matter if I am not currently hiring?
Unused options in your pool represent reserved shares that affect your fully diluted ownership calculations. If you do not track them, you might miscalculate your actual share of voting control and exit proceeds.
How do I calculate how many options to grant a new executive?
You should evaluate the executive's role, experience, and the market standards for your company stage. You can calculate the grant as a percentage of the company, and ensure it vests over several years.
What goes wrong when a business creates an option pool that is too large?
Creating an excessively large pool dilutes the founders more than necessary before the hires are actually made. You should only expand the pool as needed to cover your immediate hiring plans.
How do I recover unused shares from my option pool?
If employees leave before their options vest, or if the options expire, those shares return to the pool. You should ensure your legal documents state that unused options return to the general share reserve upon acquisition.
What is an option pool in simple words?
An option pool is a block of company shares set aside to be given to future employees, advisors, and consultants. It is like a reserve fund of ownership used to attract and reward talent.
Is an option pool risky or complicated to set up?
The setup is standard, but the rules governing how options are taxed and exercised can be detailed. Using standard templates and keeping your records in cap table software makes it safe and manageable.
Do I need a lawyer to create an option pool for my team?
Yes, you should have a startup lawyer draft the employee stock option plan to ensure it complies with local tax and securities laws. This upfront cost protects you from severe regulatory penalties later.
Will setting up an option pool cost my startup cash?
The main cost is the legal fee to draft the plan. The options themselves do not cost you cash to issue, as they are a promise of future equity rather than a direct cash payment.

Sources: Carta equity pool standards, Glossary Pilot Personalization Interview, Alex, 2026-07-16

Last reviewed: 2026-07-16