A cap table is more than a record of who owns a startup: it is a decision tool for fundraising, hiring, compensation, and exit planning. This guide explains cap table basics, shows how to estimate ownership and dilution, and provides a repeatable framework for comparing seed and Series A financing scenarios.
Overview
A capitalization table, or cap table, lists the company’s equity holders and shows how ownership changes as the business issues shares, grants options, or raises capital. A useful cap table should answer four questions clearly:
- How many shares or units are authorized, issued, and reserved?
- Who owns the outstanding equity on a fully diluted basis?
- What percentage of the company will each holder own after a new financing?
- How do options, SAFEs, convertible notes, and other rights affect future ownership?
The phrase “fully diluted” is important. A simple ownership view may include only shares already issued. A fully diluted view also considers the option pool and other instruments that can convert into equity. Investors generally focus on the fully diluted capitalization used in the financing documents, so founders should model that view before discussing valuation.
Ownership percentage is calculated as:
Ownership percentage = holder’s shares ÷ total fully diluted shares
Dilution does not mean that a holder has lost shares. It usually means the holder owns a smaller percentage because the company has issued additional shares. New capital can still benefit existing holders if it supports growth and increases the eventual value of their remaining stake. The cap table helps separate that potential benefit from the immediate ownership cost.
For a deeper operating model, see Startup Cap Table Modeling: How to Track Ownership, Dilution, and Option Pools.
How to estimate ownership and dilution
Start with a clean pre-financing capitalization table. List each founder, employee, advisor, existing investor, and reserved option pool separately. Then calculate the total fully diluted shares before the new round.
For a priced equity round, the core inputs are the pre-money valuation, the amount invested, and the treatment of the option pool. The basic post-money calculation is:
Post-money valuation = pre-money valuation + new investment
If the new investor receives ownership based on the post-money valuation, the approximate investor percentage is:
Investor percentage = new investment ÷ post-money valuation
For example, if a company raises $2 million at a $8 million pre-money valuation, the implied post-money valuation is $10 million. Before considering any separate option-pool adjustment, the new investor owns approximately 20% of the post-money company. Existing holders collectively own approximately 80%.
Share counts make the calculation more precise. Suppose the company has 8 million fully diluted shares before the round. The price per share is:
Price per share = pre-money valuation ÷ pre-money fully diluted shares
Using the example above, the price per share is $1. The $2 million investment therefore buys 2 million shares. The post-financing total is 10 million shares, and the investor owns 2 million ÷ 10 million, or 20%.
Option pools require special attention. If an investor requires the pool to be increased before the investment, the new pool is often treated as part of the pre-money capitalization. That means the dilution from creating the additional pool is borne primarily by existing holders rather than shared equally with the new investor. The precise outcome depends on the term sheet and legal documents, so the cap table should show both alternatives:
- Pool created or expanded before the financing.
- Pool created or expanded after the financing.
Do not rely on a single headline percentage when comparing proposals. Model the share price, new shares issued, option-pool change, and ownership of every material holder after closing. A term sheet review should connect directly to this model.
Inputs and assumptions
A reusable cap table worksheet can be built with five blocks of inputs.
1. Existing ownership
Record the number of shares held by each founder, investor, employee, and advisor. Keep legal holders separate even when they are affiliated. Include vesting status and any repurchase rights in a notes column.
2. Fully diluted additions
List the unallocated option pool, outstanding options, warrants, and other rights to acquire shares. Do not count the same equity twice. If an option is already included in the pool, it should not also be added as a separate unallocated reserve.
3. Financing terms
Enter the proposed investment, pre-money valuation, security type, price per share, and closing date. For a priced round, record the number of new shares. For a SAFE or convertible note, record the principal, valuation cap, discount, interest where applicable, and conversion assumptions.
4. Option-pool policy
Show the current pool, the target pool after closing, and whether the increase occurs before or after the financing. Avoid describing an option pool only as a percentage without also recording the number of shares it represents.
5. Scenario assumptions
Use separate columns or tabs for each financing scenario. Label assumptions clearly, including whether valuation is pre-money or post-money, whether the pool is included in the quoted valuation, and whether convertible instruments are included in the denominator.
For SAFEs and convertible notes, avoid treating the principal amount as a fixed ownership percentage unless the documents explicitly provide one. Conversion can depend on a valuation cap, discount, qualified financing threshold, accrued interest, and the definition of capitalization. Model the instrument under each plausible outcome and have counsel confirm the final interpretation.
It is also useful to separate economic ownership from voting control. Preferred shares may have rights that are not visible in a basic percentage table, including liquidation preferences, conversion rights, protective provisions, or participation features. A cap table does not replace a review of the financing documents.
Worked examples
Example 1: Seed round without a pool adjustment
Assume two founders collectively own 8 million shares, there are 1 million existing employee options, and the fully diluted total is 9 million shares. The company raises $1.8 million at a $7.2 million pre-money valuation.
The price per share is $7.2 million ÷ 9 million, or $0.80. The financing issues 2.25 million new shares because $1.8 million ÷ $0.80 equals 2.25 million. The post-money total is 11.25 million shares.
- Founders: 8 million ÷ 11.25 million = approximately 71.1%.
- Existing options: 1 million ÷ 11.25 million = approximately 8.9%.
- New investor: 2.25 million ÷ 11.25 million = 20%.
The founders’ share count has not changed, but their combined percentage has declined from 88.9% to approximately 71.1% because new shares were issued.
Example 2: Option-pool expansion before a round
Now assume the same company must increase its option pool from 1 million shares to 2 million shares before the financing. The pre-financing fully diluted total becomes 10 million shares. At the same $7.2 million pre-money valuation, the price per share falls to $0.72. The $1.8 million investment issues 2.5 million shares, producing a post-money total of 12.5 million shares.
- Founders: 8 million ÷ 12.5 million = 64%.
- Employee pool: 2 million ÷ 12.5 million = 16%.
- New investor: 2.5 million ÷ 12.5 million = 20%.
The investor still owns 20%, but the founders bear the additional dilution created by the larger pre-money pool. This is why “the investor gets 20%” does not fully describe the economic effect of a financing.
Example 3: Convertible instrument scenario
Suppose a company has a convertible note outstanding and is preparing for a priced round. Build at least two cases: conversion at the valuation cap and conversion at the discounted financing price. Include accrued amounts when the documents require them, then compare the resulting shares issued and ownership percentages. If the cap and discount produce different outcomes, the instrument may convert under the more favorable contractual mechanism for the holder. The exact rule should be confirmed against the signed documents.
For more fundraising preparation, use the startup financial model checklist and connect the financing size to runway through a startup runway calculation.
When to recalculate
Recalculate the cap table whenever an event changes the ownership denominator, the rights attached to equity, or the company’s financing assumptions. At minimum, review it:
- Before issuing founder, employee, or advisor equity.
- Before signing a SAFE, convertible note, warrant, or priced-round term sheet.
- When an investor proposes a new option-pool target.
- When an employee option is granted, exercised, canceled, or repriced.
- When a financing closes or an instrument converts.
- Before a secondary sale, acquisition discussion, or other liquidity event.
- Whenever the valuation, financing amount, or fundraising strategy changes materially.
Use a version-controlled file, preserve the pre-transaction snapshot, and record the source document for every assumption. Reconcile the model with the company’s equity-management system and legal records rather than allowing separate versions to drift.
Before presenting a financing scenario, run this final checklist: confirm the share count, identify every convertible instrument, verify the pre-money and post-money definitions, model the option pool in both possible positions, calculate each holder’s post-money percentage, and flag terms that require legal or tax advice. A cap table is most useful when it is updated before decisions are made, not after the transaction has already been agreed.
