Ask a founder who owns their company and they should be able to answer in seconds. The document that holds that answer is the cap table. It records exactly who owns what — every shareholder, every option, every percentage — and it changes each time you raise money or grant equity. A clear, accurate cap table is one of the most important tools a growing business has, while a messy one can derail a fundraising or hide unpleasant surprises. This guide explains what a cap table is, what it records, how dilution and option pools work, and why keeping it tidy matters.
What a cap table is
A cap table, short for capitalisation table, is a record of a company's ownership: who holds shares, how many, of what type, and what percentage of the business each person owns. At its simplest it is a list of shareholders and their stakes; at its most detailed it captures every instrument that could turn into shares and models how ownership shifts over time.
Early on, a cap table might fit on a single spreadsheet tab: two founders, perhaps a friend or family investor, splitting ownership between them. As the company grows — taking on investment, issuing options to staff, bringing in new shareholders — it becomes more complex, and keeping it accurate becomes a genuine discipline rather than an afterthought.
What a cap table records
A well-constructed cap table goes beyond a simple list. It typically records:
- Shareholders — every person or entity that owns equity.
- Share classes — ordinary shares, preference shares and any other classes, each with different rights.
- Number of shares — how many of each class each holder owns.
- Percentage ownership — each holder's share of the total, on both an issued and a fully diluted basis.
- Options and instruments — share options, warrants and convertibles that could become shares.
- Funding rounds — how ownership changed at each raise.
The most useful cap tables show ownership two ways: as issued today, and fully diluted as if all options and convertibles had converted.
The distinction between issued and fully diluted matters. Issued ownership counts only shares that actually exist now. Fully diluted ownership assumes every option and convertible has been exercised, giving a truer picture of who would own what once all potential shares are in play. Investors almost always think in fully diluted terms.
Understanding dilution
The single most important concept a cap table illustrates is dilution — the reduction in your percentage ownership when new shares are issued.
Here is the key point: when a company issues new shares, your existing share count does not change, but the total number of shares grows, so your slice of the whole shrinks. Suppose you own 500 of 1,000 shares — 50%. The company issues 500 new shares to an investor, taking the total to 1,500. You still hold 500 shares, but now that is only 33%.
Dilution is not inherently bad. The whole point of raising money is usually to grow the company, so a smaller percentage of a much larger pie can be worth far more than a bigger percentage of a small one. What matters is understanding how much you are diluted and what you get in return. Modelling each prospective round on the cap table before you agree to it — ideally before you even sign a term sheet — lets you see the trade-off clearly rather than discovering it later.
Option pools and their effect
Most companies that want to attract and retain talented staff set aside shares for them in an option pool — a reserved block of equity used to grant share options to employees. Cap tables show this pool explicitly, and it has a notable effect on ownership.
| Scenario | Effect on founders |
|---|---|
| Pool created before investment (pre-money) | Founders bear most of the dilution from the pool |
| Pool created after investment (post-money) | Dilution is shared more evenly with investors |
| Pool enlarged at each round | Repeated, cumulative dilution over time |
Investors frequently ask for an option pool to be created or topped up as part of a funding round, and whether it comes out of the pre-money or post-money valuation makes a real difference to who is diluted. This is one of the most negotiated, and most misunderstood, points in early-stage deals — and another reason to model it on the cap table before agreeing terms.
Why an accurate cap table matters
A cap table is not just for founders' peace of mind; it underpins several critical activities. When you raise money, investors will scrutinise it during due diligence, expecting it to be accurate, complete and consistent with your statutory registers and Companies House filings. Discrepancies raise red flags and can delay or even sink a deal.
A clean cap table also matters for:
- Decision-making — understanding who must approve what, and how a new round affects everyone.
- Tax-advantaged schemes — investments made under reliefs such as EIS and SEIS depend on the share structure being correct.
- Employee equity — granting and tracking options reliably.
- Exits — calculating who gets what when the company is sold, where share rights such as liquidation preferences come into play.
Keeping it accurate is a continuous job. Every share issue, transfer, option grant and round needs to be recorded promptly and reconciled with your legal records. A small company can manage with a careful spreadsheet; as complexity grows, dedicated software reduces the risk of costly errors. Either way, the cap table should always tell the true, current story of who owns your business.
The bottom line
A cap table is the record of who owns your company — every shareholder, share class, option and percentage — and how that ownership shifts with each funding round. Its most important lesson is dilution: issuing new shares shrinks existing percentages, which is fine if the company grows in value, but only if you understand the trade-off. Option pools add another layer, and where they sit relative to a round materially affects founders. Keep your cap table accurate, model new rounds before you commit, and reconcile it with your statutory records — it is the single clearest view of what your stake in the business is really worth.