Cap table basics for UK startup founders

A capitalisation table, or cap table, is a record of who owns what in your company. It lists all shareholders, how many shares each holds, the class of those shares, and the percentage of the company each stake represents.

For a small UK startup, a cap table is not just a spreadsheet for your next funding round. It underpins dozens of operational and compliance tasks. Errors here can delay investment, create disputes between founders, or lead to filings at Companies House that do not match your internal records.

Understanding your cap table and maintaining it properly from day one saves significant cost and anxiety later. This post explains what a clean cap table looks like, when you need to update it, and how to keep it aligned with your statutory registers.

This is not legal advice. For decisions about share structures or investor terms, you should consult a solicitor.

What goes on a cap table

A well-organised cap table should show, at minimum:

• The name of each shareholder
• The number of shares they own
• The class of each holding, such as ordinary shares or a separate founder class
• The date each holding was issued
• The percentage ownership on both an undiluted and fully diluted basis

Undiluted ownership simply divides by the total shares currently in issue. Fully diluted ownership accounts for all options, warrants and convertible instruments that could later turn into shares. Investors will expect to see both figures, so it is wise to calculate them as a matter of routine.

For most early-stage UK private companies limited by shares, the table will initially show just the founders and perhaps a small option pool set aside for future hires.

The link between your cap table and your statutory registers

In the UK, a private company is legally required to maintain a register of members and a register of persons with significant control. These registers must be accurate and current.

Your cap table is not, on its own, a statutory register. But it must align with them. If you record a share transfer on the cap table, the same transfer must be entered in the register of members and, where relevant, reflected in the company’s confirmation statement to Companies House.

Misalignment creates a risk. An investor conducting due diligence will compare your cap table with your Companies House filings and your board minutes. Any mismatch raises red flags, even if the underlying position is correct.

When to update the cap table

You should treat your cap table as a live document that changes whenever the company’s ownership shifts. Common triggers include:

• Issuing shares to a new hire under an employment contract or option scheme
• Transferring shares between founders or to an investor
• Allocating shares following an investment round
• Converting a convertible loan note
• Issuing shares under an EMI option scheme
• Buying back shares from a departing team member

Each change should be backed by a board minute or a shareholders’ resolution. That resolution is the authority for the share issue or transfer, and it provides a paper trail that will matter during later review.

Common mistakes to avoid

Several patterns cause trouble for small startups.

Treating a spreadsheet as the legal record. A cap table spreadsheet is a summary tool. The official records are your register of members, your register of transfers and the share certificates you have issued. The spreadsheet must match those records.

Inconsistent share classes. If you use different share classes, define the rights attached to each clearly in your articles of association. Without that clarity, you risk disputes about dividends, voting or exit proceeds.

Forgetting the option pool. Even unallocated options affect fully diluted percentages. If you have created a pool to attract future talent, show it as a separate line on the cap table so that founders and investors see the realistic picture of future dilution.

Delaying updates. If you wait until just before a funding round to reconcile everything, you will often discover lost certificates, missing board minutes or shareholders who cannot be traced. Updating the table immediately after each change is far simpler.

Cap table hygiene in practice

A small number of practical habits make cap table management much less stressful:

• Maintain one authoritative version of the table, stored securely and access-restricted.
• Record all share issues and transfers in a numbered log that cross-references the authorising board minute.
• For Companies House filings, confirm that the information on form SH01 or the confirmation statement matches the register and the cap table.
• When using an EMI option scheme, track granted, exercised and lapsed options separately so that you can calculate fully diluted percentages correctly at any point.
• Review the cap table at least once a quarter alongside a review of the statutory registers. A quick reconciliation now prevents a headache later.

Building the cap table you will later present to investors

Even if you are months or years from a funding round, it is helpful to imagine an investor reviewing your cap table tomorrow. They will want to see a clear history of share movements, no unexplained gaps, and percentages that add up. They will also want to see that founder shares are subject to vesting provisions and that the option pool is sensibly sized.

Getting those basics right early puts you in a stronger position when you do go out to raise. It also gives your fellow founders confidence that ownership is recorded properly and that nobody receives a surprise later.

If your company’s documents are otherwise in order but your cap table is a mess, that mess will absorb time and legal fees that could have been avoided. Giving the cap table the same discipline you give your board minutes and statutory filings is a straightforward way to protect the business you are building.