What an option pool is for startup hires

Option pool basics founders need before they say yes to a hire are simple to state and easy to blur in an offer call. An option pool is a block of authorized equity reserved for employees, advisors, and future hires, usually granted as options rather than issued common shares on day one. This post walks the conversation from the candidate's question to the cap table row, with one illustrative hire kept in view. It is orientation for US-style private startups. It is not legal, tax, or securities advice. Counsel and your equity plan documents control.

Option pool basics founders hear first on the call

Illustrative hire: Sam, a first engineering manager candidate at a seed-stage company (composite only). Sam asks whether 0.8 percent is outstanding shares, fully diluted, or "of the option pool." The founder who cannot answer cleanly is not ready to send the offer.

Answer in three beats. First, the grant size in shares or units, and the percent of the company on a named basis (for example, percent of fully diluted shares including the pool). Second, vesting, cliff, and exercise basics as your plan states them. Third, that the pool exists so the company can hire without renegotiating founder ownership every week. Skipping the named basis is how Sam's lawyer ends up redlining the letter a week later.

Keep Sam on the line for the rest of this piece. Every table row and ownership note should still make sense in that call.

Illustrative opener that works: "We are offering 80,000 options under the 2024 plan, about 0.8 percent of fully diluted including the employee option pool as of the May board consent. Vesting is four years with a one-year cliff on the plan's standard schedule. The pool is shared with future hires; it is not a personal reserve with your name on it." That paragraph already contains option pool basics founders must rehearse before the video tile lights up.

What the pool is for (and what it is not)

The pool is a hiring and retention budget denominated in equity. It is not free money, not a second class of "almost founders," and not a place to hide investor ownership. Investors often require an unallocated pool before a priced round so post-money hiring does not immediately demand a new top-up that dilutes them more than the model showed. Founders feel that as a pre-round dilution when the pool is expanded in the round paperwork.

Promises that break the pool under pressure: a percent for Sam that only works if the reserve is secretly larger than the board approved; a grant into an already exhausted pool; describing unallocated pool shares as if they were issued and voting today. For the wider picture of who owns what, see What is a startup cap table and why it matters. The pool is one row family on that table, not a side handshake.

Also separate advisor grants from employee hiring reserves in your head even if both draw from related plan capacity. An illustrative mistake is promising a heavy advisor load in coffee chats, then discovering Sam's offer needs a board expansion you never queued. Put advisor and employee drains on the same hiring-and-retention plan so the unallocated line is not a surprise.

Vocabulary you must share before percentages

Say authorized when you mean the ceiling the company may issue under its charter and plan. Say reserved or unallocated pool when you mean what is still available to grant. Say granted when a person has an option award. Say outstanding when shares are issued and held. Say fully diluted when you include issued shares plus reserved convertible and option overhang on the definition your board uses. If Sam hears "percent of the company" without that map, they will invent one.

Write those words on a one-page offer glossary shared with co-founders before anyone speaks percentages aloud. Put cliff, strike price, and early exercise rules on the same page. The glossary is what keeps two founders from giving two denominators in two interviews.

When Sam asks whether the pool is "extra dilution just for employees," explain that the reserve is part of the ownership model investors underwrite. Expanding it to hire can change founder and investor percentages depending on when the expansion happens. You do not need a full fully diluted treatise on this call; you need enough honesty that Sam's percent basis matches the board packet.

Practice one concrete sentence on timing: "If we enlarge the pool in the Series A paperwork before your grant is restated, your share count stays fixed unless the documents say otherwise, and the percent may move." If you cannot say that without guessing, bring counsel into the drafting loop before Sam's deadline. Option pool basics founders include knowing which questions leave the recruiting channel.

Illustrative pool math Sam can see

Numbers below are illustrative only. They are not market advice and not a template grant.

Walk Sam through row one aloud. Show that 0.8 percent consumed 80,000 of 1,000,000 unallocated. Show that future hires eat the same pool. Show that a round-driven pool expansion can change percentages depending on whether grants are fixed shares or fixed percent.

If your offer uses percent language, state whether a reverse split, pool top-up, or priced round adjusts the share count. If it uses share counts, state the current FD denominator you used. Pick one primary language and put the other in parentheses once. Illustrative follow-up Sam should hear: "Your grant is 80,000 options, about 0.8 percent of fully diluted including the pool as of this board date; the unallocated pool then has 920,000 left for everyone else."

Show Sam the same numbers the board sees

Do not keep Sam's promise in an email thread while the ownership system still shows the old reserve. Cap Table (checked 31 Oct 2026) tracks who owns your company: share counts and par value, founders, investors, employees, advisors, and the option pool, plus financing rounds and simple models of future rounds or exits. Read access can view stakeholders and scenarios; create or update permission is required to add stakeholders, issue equity, or edit settings. Open it from Fundraising, then Cap Table.

Before the offer goes out, confirm unallocated pool covers Sam's grant plus the next planned hires on your hiring plan. After Sam signs, record the grant so unallocated declines by the granted amount. When the board expands the pool, update the reserve before finance models the next round. Verified habit: the percent on the call matches the Cap Table scenario you would show a co-founder the same day. If they disagree, stop the offer until they match.

Scratch math in a sheet is fine while you think. Once Cap Table is in use, it is the ownership system of record. Option pool basics founders who skip the update create two truths: one for recruiting, one for diligence.

Before Sam's onsite loop ends, export or screenshot the scenario you used for the percent basis and store it with the offer draft. When a co-founder later asks why the letter says 0.8 percent, you point at the same scenario instead of rebuilding the denominator from memory. That artifact is part of the hiring file, not optional polish.

What to tell Sam, the board, and future you

To Sam: grant size, named percent basis, vesting, early exercise rules if any, and that unallocated pool is shared with future hires. Do not imply the pool is Sam's personal bucket. Send the equity plan packet rather than improvising tax answers.

To the board: remaining unallocated after the grant, the hiring plan that residual must cover, and whether a top-up is expected before the next raise. Exhausting the pool in silence is how term-sheet pool fights get worse.

To future you: a dated note with the denominator used, the plan document version, and who approved the grant. When diligence asks how you defined fully diluted, that note is the difference between a calm answer and a reconstruction project. A dedicated fully diluted explainer can wait for its own post; the offer call only needs a consistent definition.

Illustrative close for Sam's thread: founder sends a four-line summary (shares, percent basis, vesting, pool remaining), updates Cap Table, and schedules counsel review of the letter before signature. Sam gets clarity. The reserve still funds the next hires. Nobody invents equity law on a video call.

If Sam negotiates to 1.0 percent, rerun the table before you agree. Illustrative path: 100,000 options on the same 10,000,000 FD leaves 900,000 unallocated if you started at 1,000,000. Ask whether the hiring plan still covers the next two roles. If not, take the choice to the board as a pool or headcount decision, not as a private recruiting concession. Option pool basics founders treat negotiation as a model change, not as a vibe change.