Guide

The option pool is a block of authorized shares reserved for employees, advisors and sometimes consultants. It is how startups pay for talent when cash is scarce. It is also one of the most misunderstood levers in a priced round: investors often insist the pool be topped up before their money comes in, which dilutes founders and earlier holders, not the new preferred.

One sentence: a larger pool helps hiring, and carving it from the pre-money transfers ownership from common holders to future employees (and sweetens the deal for the incoming investor).

The pool appears on the cap table as reserved shares even when unissued. Fully diluted ownership already assumes those shares will exist. Granting options moves shares from "available" to "outstanding"; FD total stays the same until you expand the pool.

Create the pool at incorporation and the 10% comes entirely from founder opportunity — there are no investors yet. Expand it in a priced round and the shuffle usually makes founders pay.

When a company says your grant is "0.40% fully diluted," that percentage already divides by a denominator that includes the unissued pool. What dilutes you next is new financings, pool expansions beyond today's reserve, and convertibles not yet in the number you were quoted.

Concepts in this section

StepConceptWhat it answers
1Sizing an option poolHow large should the reserve be, and what do roles get?
2The option pool shuffleWhy a 15% post-money pool is a stealth valuation cut.
3Option pool refreshesWhen do you top up again, and what does "10% after close" mean?

Founders: build the hiring-plan spreadsheet before the term sheet. Counter a 15% ask with names and roles. Hiring managers: know available pool before you promise 0.5%. Employees: ask what % of FD your grant is and how large the unissued pool is.

Common mistakes

  • Agreeing to 15% post-money pool with no model.
  • Granting above the reserve.
  • Promising % without knowing the fully diluted denominator.
  • Hoping attrition funds the next VP.
  • Paying advisors like co-founders.

Key takeaways

  • Unissued pool still counts in fully diluted ownership.
  • Size from a hiring plan plus buffer.
  • Post-money pool requirements usually mean pre-money dilution for founders.
  • Refreshes repeat; cancellations recycle grants into available.
  • Unused pool is not free — it is prepaid dilution.

Further learning

Startup school | Stock options, strike prices, and vesting schedules (from Cap Table 101)Carta
Startup school | Option pool dilution, and converting SAFEs (from Cap Table 101)Carta
Index Ventures OptionPlanEntrepreneurs know how important stock options are for hiring and retaining the best talent.Index Ventures The Holloway Guide to Equity CompensationStock options, RSUs, job offers, and taxes—a detailed reference, including hundreds of resources, explained from the ground up, for both employees and managers.Holloway