--- title: "Employee Option Pool | Altss Glossary" description: "An employee option pool is the block of a company's shares reserved under its equity incentive plan for future grants of stock options and other equity…" canonical: "https://altss.com/glossary/option-pool" --- Glossary · Shareholder rights & company governance # Employee Option Pool Also called: ESOP (employee stock option plan) In startup usage an employee stock option plan (ESOP) means the company's equity incentive plan or the pool reserved under it. In US law an employee stock ownership plan, also abbreviated ESOP, is a tax-qualified retirement plan governed by the Employee Retirement Income Security Act (ERISA) and the Internal Revenue Code that invests mainly in employer stock. The two are unrelated. An employee option pool is the block of a company's shares reserved under its equity incentive plan for future grants of stock options and other equity awards to employees, directors and advisers. Publisher: Altss LLCPublished 2026-01-08Content modified 2026-10-02 ALTSS-VC-025 Startups pay part of their staff's compensation in equity. To do that they set aside a number of shares that can be granted later. Investors usually ask for the pool to be created or enlarged before their money comes in, which means existing shareholders, not the new investor, absorb the dilution. ## Formula ### Option pool shuffle (new pool inside the pre-money) ``` Pool shares P = t × S_e × (1 + k) / (1 − t × (1 + k)), with k = investment / pre-money; price p = pre-money / (existing shares + pool) ``` `t` target pool as a fraction of post-money fully diluted shares `S_e` existing fully diluted shares before the new pool `I` new investment `V_pre` headline pre-money valuation `P` new pool shares created before the round `p` price per share paid by the new investor Assumes the whole new pool is unallocated and counted in the pre-money. Effective pre-money to existing holders = p × `S_e` = `V_pre` − p × P. Term sheets may instead size the pool on a pre-money basis or create it after the round. ## How the pool works The board and stockholders adopt an equity incentive plan and reserve a number of authorised but unissued shares for it. Grants of options (or restricted stock units) are made from the reserve; shares from expired, forfeited or repurchased awards usually return to it. Cap tables show granted awards and the unallocated remainder separately, and both are counted in the fully diluted shares used to price a round. In the US, options are normally granted with an exercise price at least equal to the fair market value of the common stock on the grant date, commonly supported by a [409A valuation](https://altss.com/glossary/409a-valuation), because a lower price can bring the option within Internal Revenue Code section 409A (Treasury Regulation 1.409A-1(b)(5)(i)(A)(1)), and may be incentive stock options (ISOs) or non-qualified options with different tax treatment. Incentive stock options must meet the conditions of Internal Revenue Code section 422, including an exercise price not below fair market value at grant and a term of no more than 10 years; to the extent the value of stock for which a holder's ISOs first become exercisable in a calendar year exceeds $100,000, the excess options are treated as non-qualified. ## The option pool shuffle Investors usually price their round on a pre-money share count that already includes the new or enlarged pool. The pool then dilutes only the existing holders, and the effective pre-money valuation they receive is lower than the headline figure. Founders negotiate both the headline valuation and the pool size, because a larger pool inside the pre-money is economically a lower price. Pool size is normally argued from a hiring plan covering the period to the next financing; an oversized pool transfers value from existing holders until it is used. ## Interaction with SAFEs and later rounds Under the Y Combinator post-money [SAFE](https://altss.com/glossary/safe-simple-agreement-for-future-equity), an increase to the pool made in connection with the priced round generally sits outside the capitalisation used to convert the SAFE, so SAFE holders share that dilution with founders. After a [down round](https://altss.com/glossary/down-round), companies often add to the pool or reprice underwater options to restore incentives, which is another source of [dilution](https://altss.com/glossary/dilution) for existing holders. ## ESOP: two different meanings Startup founders and investors often say "ESOP" for the option plan or pool. In US benefits law, an ESOP is an employee stock ownership plan: a defined contribution retirement plan, qualified under the Internal Revenue Code and subject to ERISA, that holds employer stock for employees, frequently used in buyouts of private companies by their employees. Outside the US, "ESOP" is also used loosely for employee share schemes generally, and local tax-advantaged option schemes have their own rules. Spelling the abbreviation out on first use avoids the confusion. ERISA section 407(d)(6) defines an employee stock ownership plan as an individual account plan that is a tax-qualified stock bonus plan, or a stock bonus plan and money purchase plan both qualified, designed to invest primarily in qualifying employer securities. ## Worked example ### Illustrative option pool shuffle A company with 8,000,000 fully diluted shares raises $5m at a $20m pre-money valuation, and the investor requires a pool equal to 10% of post-money shares, created before the round. The pool is **1,142,857** shares, the price is **$2.1875** and the investor receives **2,285,714** shares (20%). Existing holders own 70% and receive an effective pre-money of **$17.5m**, not the $20m headline. If the same 10% pool were created after the round, the price would be $2.50, the investor would own 18%, the pool 10% and existing holders 72%. Examples are illustrative; figures are not market data. ## Not the same as - Management Incentive Plan: A management incentive plan in a buyout gives management a share of equity value above the sponsor's return; a venture option pool reserves shares for options across the workforce. - Founder Vesting: Founder vesting applies a repurchase right to shares founders already own; the option pool holds shares not yet granted. ## Common mistakes - Comparing two pre-money valuations without asking whether the pool increase sits inside each pre-money. - Counting the unallocated pool as founder or employee ownership. - Using "ESOP" on a page read by US benefits or ERISA specialists without defining it. - Sizing the pool to a target percentage rather than to the hiring plan. ## Questions ### Why do investors want the option pool in the pre-money? So the pool dilutes existing holders rather than the new investor. It lowers the effective price the investor pays without changing the headline valuation. ### Is an ESOP the same as an option pool? In startup slang, often yes. In US law, ESOP means an employee stock ownership plan, a tax-qualified retirement plan, which is a different thing. ## Sources - [26 CFR 1.409A-1 - Definitions and covered plans (incl. 1.409A-1(b)(5)(iv)(B) stock valuation)](https://www.law.cornell.edu/cfr/text/26/1.409A-1). Internal Revenue Service / U.S. Department of the Treasury (CFR text via eCFR; LII mirror), eCFR current as of 2026-09-29; last amended 2016-05-18. Status: in force (checked 2026-10-01). 26 CFR 1.409A-1(b)(5)(i)(A)(1), (b)(5)(iv)(B)(1)-(2) — supports: A stock option is not deferred compensation if, among other conditions, the exercise price may never be less than FMV at grant; FMV of private stock by reasonable valuation method - [Y Combinator SAFE (post-money) documents and SAFE User Guide](https://www.ycombinator.com/documents). Y Combinator, Post-money SAFE introduced 2018. Status: Current (checked 2026-10-01). Post-money SAFE, definition of Company Capitalization (Unissued Option Pool) — supports: Treatment of a pool increase made in connection with the priced round - [29 U.S.C. 1107 - Limitation with respect to acquisition and holding of employer securities and employer real property by certain plans (ERISA s.407)](https://www.law.cornell.edu/uscode/text/29/1107). U.S. Congress (US Code via LII), Current US Code text as published by LII (accessed 2026-10-01). Status: in force (checked 2026-10-01). ERISA sec. 407(d)(6)(A) (29 U.S.C. 1107(d)(6)(A)) — supports: Legal definition of an employee stock ownership plan - [26 U.S.C. 422 - Incentive stock options](https://www.law.cornell.edu/uscode/text/26/422). U.S. Congress (US Code via LII), Current US Code text as published by LII (accessed 2026-10-01). Status: in force (checked 2026-10-01). Sec. 422(b)(1)-(6), (d)(1) — supports: Incentive stock option conditions (exercise price not below FMV at grant, term of no more than 10 years) and $100,000 first-exercisable limit ## Related terms 6 terms - [Pre-Money and Post-Money Valuation](https://altss.com/glossary/pre-money-and-post-money-valuation) - [Dilution](https://altss.com/glossary/dilution) - [409A Valuation](https://altss.com/glossary/409a-valuation) - [Priced Round](https://altss.com/glossary/priced-round) - [Term Sheet](https://altss.com/glossary/term-sheet) - [Cap Table (Capitalization Table)](https://altss.com/glossary/cap-table-capitalization-table) ## Referenced by 3 terms - [Down Round](https://altss.com/glossary/down-round) - [Simple Agreement for Future Equity (SAFE)](https://altss.com/glossary/safe-simple-agreement-for-future-equity) - [Series A](https://altss.com/glossary/series-a) ## Concept record Concept ID ALTSS-VC-025 Classification Shareholder rights & company governance · Fund economics Topics Venture capital & startups Version 2.0.0 Last reviewed 2026-10-02 Structured data [JSON](https://altss.com/reference/concepts/option-pool.json) Source check Legal and tax statements checked against the cited primary sources on 2026-10-02 ([how](https://altss.com/methodology)). General information, not advice. ## Canonical URL https://altss.com/glossary/option-pool