Cap Tables Explained: What They Show and Why Dilution Matters

A capitalisation table — almost universally shortened to "cap table" — is a record of who owns what in a company: every shareholder, every class of shares or options they hold, and the percentage of the company each represents. For private companies, particularly startups going through multiple funding rounds, the cap table is one of the most important documents in the business, since it determines how value is split between founders, employees, and investors at every stage, including at an eventual exit.

What a cap table contains

A basic cap table lists every shareholder alongside the number and class of shares they hold — ordinary shares, preference shares, and any options or warrants that could convert into shares in future. From this raw data, the table calculates each holder's ownership percentage, both on a "as-issued" basis (shares currently in existence) and a "fully diluted" basis, which also accounts for shares that would exist if every outstanding option, warrant, and convertible instrument were exercised or converted. Fully diluted ownership is almost always the more meaningful number, because it reflects what each shareholder's stake will actually be worth once the option pool and any convertible instruments are accounted for.

Why dilution matters

Every time a company issues new shares — to raise capital in a funding round, to grant options to new employees, or to convert a note or warrant — existing shareholders' percentage ownership decreases, even though the number of shares they personally hold stays the same. This is dilution, and it's the central mechanic that makes cap table management important: founders and early employees typically hold a large percentage of a very small company, and that percentage shrinks with each funding round as new investors buy in, even as the value of the smaller percentage they retain (hopefully) grows because the company itself is worth more.

Understanding dilution is essential for anyone negotiating a funding round, an option grant, or an exit, because the headline valuation of a deal only tells part of the story — what actually matters to an individual shareholder is their post-transaction percentage ownership and how it compares to their pre-transaction stake.

Preference stacks and liquidation preferences

Cap tables for venture-backed companies typically include multiple classes of preference shares, issued across successive funding rounds, each carrying its own liquidation preference — a contractual right for that share class to be paid out before ordinary shareholders in the event of a sale or wind-down, often with a multiple attached (a "1x" or "2x" preference, for example). A cap table that only shows raw ownership percentages without factoring in the liquidation preference stack can be seriously misleading about what different shareholders would actually receive in an exit, particularly in a modest or "down round" exit scenario where the preference stack absorbs most of the proceeds before ordinary shareholders see anything.

Common cap table mistakes

The most common practical problem with cap tables is simply poor maintenance — a spreadsheet that isn't updated consistently as options are granted, exercised, or lapsed quickly becomes inaccurate, and an inaccurate cap table can derail a funding round or acquisition when due diligence surfaces discrepancies between what the company believes it owns and what the paperwork actually supports. Founders also commonly underestimate the dilutive effect of the option pool that investors typically require be set aside (and often "topped up" pre-money, meaning existing shareholders bear the dilution rather than the incoming investor).

Cap tables across funding rounds

A cap table is never static. Every priced round changes it: new investor shares are issued, the option pool is often topped up (and that top-up is usually taken before the new money is calculated, which is what makes "pre-money option pool refresh" such a contentious negotiating point), and existing shareholders are diluted in proportion to their pre-round stake. A founder who owns 60% pre-seed might hold 35-40% after a seed and Series A, not because anything was taken from them, but because the pie grew and new slices were cut from it. Modelling this properly means running the cap table forward under a few scenarios — a clean round, a round with a larger option pool refresh, a round with a bridge note converting at a discount — before a term sheet is signed, not after. For finance teams supporting a growth-stage business, keeping the cap table current alongside a rolling forecast makes it far easier to answer the question every board eventually asks: what does the ownership picture look like if we raise again in twelve months?

FAQs

What's the difference between "as-issued" and "fully diluted" ownership?
As-issued ownership reflects shares that currently exist. Fully diluted ownership also accounts for shares that would be created if every outstanding option, warrant, or convertible instrument were exercised or converted — it's the more conservative and generally more meaningful figure.

Who maintains a company's cap table?
Typically the finance function or company secretary maintains it, though many venture-backed companies now use dedicated cap table management software rather than a manually updated spreadsheet, precisely because manual errors are so common and so costly once a company has multiple funding rounds and option grants to track.

Why does the option pool affect existing shareholders rather than new investors?
Investors typically require the option pool to be created or topped up before their investment is priced ("pre-money"), which means the dilution from that pool falls on existing shareholders rather than being shared proportionally with the incoming investor.

Explore Learnsignal's guide to LBO modelling for how capital structure and ownership stakes interact in a transaction, or browse our CPD courses for structured training in corporate finance.