Employee option pools: the hiring reserve that changes your cap table

An employee option pool is a block of company shares reserved for future equity grants, usually for employees and sometimes for advisors, contractors, directors, or executives. It gives a startup an equity reserve for hiring and retention, while reducing the percentage ownership of other holders. During a financing, the consequential question is who bears that dilution: existing holders alone in a pre-money pool, or existing and new holders together in a post-money pool.

The pool is a hiring budget in ownership terms, not free compensation. It can reduce immediate cash compensation needs, but its effect belongs in the cap table alongside issued shares and the shares reserved for the pool.

How an employee option pool works

A company sets aside a specified number of shares for future grants. Those shares appear on the cap table as reserved for future equity awards. The reserve allows the company to make grants without returning to shareholders for approval on every grant. Although the name says “option pool,” grants can include stock options, restricted stock awards, or restricted stock units.

For a hire, an equity grant comes from that reserve. An option can allow a vested employee to buy a predetermined number of shares at a predetermined strike price. The pool itself is not an award to a person; it is the reserve from which future grants may be made.

Terminology is loose. Some startup materials call an option pool an “ESOP,” but Carta distinguishes it from an employee stock ownership plan, which it describes as a company-funded retirement account that holds stock for employees and can carry certain tax benefits. Carta says most venture-backed startups use option pools rather than that retirement-plan structure.

Why the reserve becomes a term-sheet issue

Equity can help a cash-constrained company recruit, retain, and reward people. The trade-off is dilution: creating or expanding a pool changes ownership percentages by adding shares to the company’s equity structure.

Pool size and structure are frequent funding-round negotiation matters because they affect both valuation mechanics and ownership after the round. HSBC Innovation Banking reported that an option pool was created or topped up in 71% of the term-sheet cases covered by its 2026 Term Sheet Guide.

Pre-money versus post-money option pools

Pre-money treatment: The pool is included before the new money enters. Existing shareholders, including founders and earlier investors, absorb the pool’s dilution; the incoming investor does not. This is often called the option pool shuffle because existing holders are diluted by the reserve and then by the financing.

Post-money treatment: The pool is created or increased after accounting for the new investor’s shares. Existing holders and the incoming investor each give up a proportionate part of their ownership to create the reserve. This allocation is commonly described as more founder-friendly because the investor shares the pool dilution.

• For a pre-money pool, model founder and existing-holder ownership after both the new reserve and the financing.
• For a post-money pool, model the dilution shared by existing and incoming holders.
• In either case, compare the fully diluted cap table with the headline pre-money valuation.

Worked example: the same stated valuation, different ownership

Hypothetical inputs: 8 million shares outstanding; a stated $8 million pre-money valuation; a $2 million investment; and a requested pool equal to 20% of the $10 million post-money value.

1. Pre-money pool. The $10 million post-money result divides into 60% for existing holders, 20% for the pool, and 20% for the new investor. In this allocation, the effective valuation is $6 million rather than the stated $8 million.
2. Per-share check. $6 million divided by the 8 million existing shares equals $0.75 per existing share. A $2 million pool at that price requires about 2.67 million new shares; the $2 million investment also buys about 2.67 million shares. Total fully diluted shares become about 13.33 million, and 8 million divided by 13.33 million equals 60%.
3. Post-money pool. Before the pool, existing holders own 80% and the investor owns 20% of the $10 million post-money company. Creating a 20% pool then reduces those stakes proportionately to 64% and 16%, with 20% reserved for the pool.

This is an illustration of allocation mechanics, not a recommended pool size or valuation. A stated pre-money number alone does not settle the ownership outcome.

Size the pool from a hiring plan, then test the benchmark

Start with a bottoms-up forecast for the period until the next expected financing: identify roles to fill, likely hiring dates, and the equity grants expected for each role. Compare that forecast with the ungranted reserve. Reassess the pool as hiring plans change.

Benchmarks are context, not an answer. HSBC Innovation Banking reported that 10% to 15% was the most common pool range in its 2026 Term Sheet Guide, with 10% the most frequent size. Carta’s 2023 analysis of U.S. startups incorporated as C-corps found median employee reserves of 13% to 14% at seed and roughly 18% to 19% at Series D. Carta also found wide variation among companies at the same stage, so stage cannot substitute for a headcount and grant forecast.

Keep the pool under operating control

• Track grants and the remaining ungranted reserve on the cap table.
• Revisit the forecast when headcount plans, senior hiring needs, or financing timing change.
• Before a top-up, model ownership on a fully diluted basis and specify whether the increase is pre-money or post-money.
• Use qualified legal and tax professionals for plan design and jurisdiction-specific implementation.

Separate two decisions that often get bundled together: how much equity the company needs for hiring, and how the financing parties divide the dilution required to create that reserve.

Frequently asked questions

How does a pre-money option-pool top-up change a founder’s effective valuation?

A pre-money top-up is created before the new investment, so existing holders absorb its dilution while the incoming investor does not. In the illustrative $8 million pre-money, $2 million raise, and 20% pool scenario, existing holders end with 60% of the company, the pool holds 20%, and the investor holds 20%; the effective valuation in that allocation is $6 million.

What is the difference between an option pool and an employee stock ownership plan?

An option pool is a reserve of shares for future startup equity grants. Carta distinguishes it from an employee stock ownership plan, which it describes as a company-funded retirement account that holds stock for employees and can have certain tax benefits.

When should a startup increase its option pool?

A startup should reassess the reserve as its hiring plan changes and compare the remaining ungranted shares with expected roles and grants before the next financing. Before a top-up, model the resulting fully diluted ownership and whether the increase is treated pre-money or post-money.

Sources

• How to Size Your Employee Option Pool - Carta — carta.com
• What is an Employee Option Pool? | AngelList Education Center — www.angellist.com
• What startup founders must know about employee option pools — www.hsbcinnovationbanking.com
• How Much Should You Reserve in the Employee Option Pool - Carta — carta.com
• Managing your startup employee equity with an option pool — ltse.com