Calculating stake from fully diluted totals
Ownership percentage equals the number of shares a person holds divided by the total number of fully diluted shares outstanding. If a company has 1,000,000 fully diluted shares and an employee holds 20,000 options, that employee's fully diluted ownership is 20,000 divided by 1,000,000, which is 2.0%.
Share count growth from new issuances
Every time a company issues new shares, whether to a new investor or into a larger option pool, the total share count grows. Because a shareholder's own share count usually stays fixed, their percentage of the larger total falls. This is normal and expected across a company's life, not a sign of anything going wrong, and it shows up clearly in any startup valuation walkthrough.
| Stage | Founder combined ownership (illustrative) |
|---|---|
| At incorporation | 100% |
| After option pool created | 85% to 90% |
| After seed round | 60% to 70% |
| After Series A | 40% to 50% |
| At exit (illustrative) | 10% to 30% |
Distinguishing economic value from ownership percentage
A smaller percentage of a larger, more valuable company can be worth far more than a larger percentage of a small one. Founders holding 20% of a company valued at 50,000,000 have a stake worth 10,000,000, more than 60% of a company valued at 5,000,000, worth 3,000,000. This is the main argument for accepting reasonable dilution in exchange for growth capital.
Investor protections impacting final equity proceeds
- Pro-rata rights: let an investor maintain their percentage by investing further in later rounds
- Anti-dilution protection: adjusts an investor's conversion price if a later round prices shares lower (a down round)
- Liquidation preference: does not change ownership percentage, but changes how proceeds are split on exit, so headline percentage is not the whole story
Ownership percentage, clarified
- Does ownership percentage include unvested shares?
- On a fully diluted cap table, yes, unvested shares are usually counted since they are legally issued or reserved, but vesting affects what happens if the holder leaves before vesting completes.
- Can a shareholder's percentage go up over time?
- It can, if they invest further in later rounds, exercise more options than others, or if other shareholders' shares are cancelled or repurchased, but it is uncommon without an active new investment.
General information for founders, not legal or tax advice. Thresholds and rates change, so confirm the current position with an adviser in the relevant country before granting.