What Is a Cap Table and How Does It Work?

If you’re building a company in the UK, you’ll hear investors, accountants and lawyers ask for your “cap table”. Don’t stress - it’s simply the one source of truth for who owns what in your company, and on what terms.

Getting your cap table right from day one will save you headaches later. It helps you make smart decisions about fundraising, hiring with equity, and protecting control - all while staying compliant with UK company law.

In this guide, we’ll explain what a cap table is, what it should include, how to build one, and the legal documents that influence it as your business grows.

What Is A Cap Table (And Why It Matters)?

A cap table (short for “capitalisation table”) is a structured record of your company’s ownership. It shows each shareholder, how many shares they hold, which class those shares are, and what percentage of the company this represents.

It usually goes further than a simple list. A good cap table tracks option pools, granted options, vesting schedules, convertible instruments (like SAFEs or convertible loan notes), and the fully diluted ownership picture - i.e. what ownership would look like if all options and convertibles converted into shares.

Why it matters:

• Sound decision-making: You can see quickly how new investment or employee options will dilute existing shareholders.
• Investor readiness: Any investor will ask for your cap table; it’s part of basic due diligence.
• Control and governance: You’ll understand voting power, pre-emption rights and who can pass resolutions.
• Compliance: It helps you keep Companies House filings, your statutory registers, and your PSC records aligned.

The Core Elements You’ll Track On A Cap Table

While formats vary (from a simple spreadsheet to specialist software), most UK startup cap tables include the following fields.

Shareholders And Share Classes

You’ll list all shareholders (founders, investors, employees with shares, and any trustees or nominees), the number of shares held, and the class of each share (e.g. Ordinary, A Preferred, B Ordinary). Different classes often have different rights (voting, dividends, liquidation preferences). If you’re weighing up different classes, it’s worth reading about share classes before you issue them.

Ownership Percentages

Two views matter:

• Issued (basic) ownership: Based on shares currently issued and outstanding.
• Fully diluted ownership: Assumes all options, warrants and convertible instruments convert into shares.

Investors focus on fully diluted percentages, because that reflects the “true” potential ownership picture after all promises are honoured.

Option Pool And Grants

Your option pool is the slice of equity reserved for employees, advisors and contractors. The cap table should show:

• Pool size approved by the board/shareholders
• Granted options vs remaining pool
• Vesting schedules and exercise prices

If you’re planning to use HMRC tax-advantaged options, factor in EMI Options early - the scheme terms and HMRC valuation (EMI valuation/AMV) will affect your cap table.

Convertible Instruments

SAFE notes and convertible loan notes often convert into equity at the next funding round, typically using a discount and/or valuation cap. Your cap table should model their likely conversion so you aren’t surprised by dilution later.

Valuation And Rounds

For each investment round (pre-seed, seed, Series A, etc.), track:

• Pre-money valuation and post-money valuation
• Amount raised and price per share
• New shares issued and resulting ownership

Key Dates And Documents

Include the dates of share issuances, option grants, option exercises, and any transfers. Link each change to its authorising document (board minutes, resolutions, subscription agreements) and to the relevant Companies House filings (SH01 for new allotments, confirmation statement updates, etc.).

How To Build A Cap Table Step-By-Step

Here’s a practical sequence to set up a robust, investor-ready cap table for a UK company limited by shares.

1) Start With Your Incorporation

If you haven’t incorporated yet, decide initial share split and share classes before you register a company. Keep it simple: most early-stage companies start with Ordinary shares for founders, then create additional classes later if needed.

Record at least:

• Founders’ names and initial share numbers
• Nominal value (e.g. £0.01 per share)
• Any share premium paid
• Initial percentage ownership per founder

2) Align Your Legal Documents And Share Rights

Make sure the share rights in your Articles of Association match what your cap table assumes (e.g. voting rights, dividend rights, pre-emption). If you have or will seek investment, a tailored Shareholders Agreement should set out transfer restrictions, vesting or leaver provisions, and investor protections - all of which impact who can hold shares and when.

3) Create Your Option Pool

Decide the size of your option pool based on hiring plans (many UK startups set 5–15% at seed). Get the pool approved and recorded through board/shareholder resolutions. Add the pool to your cap table as “unallocated options”. If you plan to grant EMI options, ensure you design the scheme in line with EMI Options rules and seek the necessary valuations.

4) Model Your Funding Round

Before you sign any term sheet, model the round on a fully diluted basis. Answer questions like:

• Is the option pool created pre-money or post-money?
• How will existing convertibles convert (discounts, caps, most-favoured nation)?
• What are the new investor ownership percentages?

This is where the cap table earns its keep - it shows the real dilution effect so you can negotiate terms with clarity.

5) Keep Statutory Records In Sync

In the UK, your legal cap table must match your statutory registers and Companies House filings under the Companies Act 2006. After each allotment or transfer, update:

• Register of members (shareholders)
• PSC records (people with significant control) - see our overview of People With Significant Control
• SH01 (return of allotment of shares), if you issue new shares
• Your confirmation statement (annually, or sooner if there are changes to share structure/PSC)

6) Use Clear Version Control

Whether you use a spreadsheet or a cap table tool, keep a master live version and a dated snapshot for each transaction. Store board minutes, resolutions and subscription docs alongside the snapshot for a clean audit trail.

Legal Documents That Shape Ownership And Control

Your cap table is only as good as the documents that define the rights behind the numbers. These are the core instruments that typically shape a UK company’s ownership:

Articles Of Association

The Articles set the rules for share classes, voting, dividends, pre-emption on new issues, and transfers. If you’re issuing multiple classes or bringing on investors, customised Articles of Association are standard.

Shareholders Agreement

A well-drafted Shareholders Agreement covers decision-making, share transfers, drag/tag rights, leaver provisions, information rights, and dispute processes. It ensures the cap table translates into practical control and predictable outcomes if someone leaves or if you sell the business.

Option Schemes And Grant Agreements

For UK startups, EMI is often the preferred route due to favourable tax treatment. The terms of your EMI Options scheme, plus individual option grant letters, set vesting schedules, exercise prices, performance conditions and leaver consequences - all of which determine when options become shares on the cap table.

Vesting And Founder Leaver Clauses

Founder equity vesting helps protect the business if a founder leaves early. This is reflected either in a Share Vesting Agreement or in the Shareholders Agreement/Articles. Your cap table should model vesting over time and show how unvested shares or options are treated on departure.

Investment And Convertible Documents

Subscription agreements (for priced rounds), convertible loan notes and SAFEs control how new capital turns into equity. Make sure your cap table correctly incorporates discounts, valuation caps and any warrants or performance-related issuances.

Transfers, Buy-Backs And Secondary Sales

If shares change hands, your cap table must reflect it, together with authorisations and filings. For individual changes, ensure the process follows your transfer restrictions and document a Share Transfer properly. For company-led repurchases, check the rules for buy-backs and how they affect the share count and percentages.

Common UK Scenarios That Change The Cap Table

Here are the typical moments when we see cap tables go out of sync - and how to stay ahead of them.

Pre-Seed/Seed Funding

Angels and seed funds often ask for a post-money option pool and standard investor protections. Model several scenarios (different pool sizes and valuations) to choose a mix that still leaves founders with meaningful ownership while meeting investor requirements. Keep an eye on Share Dilution to avoid over-issuing too early.

Creating Or Expanding The Option Pool

Expanding the pool increases the fully diluted share count and typically dilutes all existing holders in proportion. Decide if the pool top-up is pre-money (dilutes founders more) or post-money (dilutes new investors too) and document it appropriately in your round paperwork and board/shareholder approvals.

Employee Departures (Good/Bad Leavers)

When an option holder or founder leaves, vesting and leaver provisions determine what happens. Your cap table should reflect forfeited or repurchased equity and the return of options to the pool. Make sure your Shareholders Agreement and option scheme documents are clear on definitions and pricing for any buy-backs or forced transfers.

Convertible Notes Converting

At your next qualified financing, convertibles will crystallise into equity. The conversion price often uses a discount or the valuation cap. Update your cap table to show the new shares issued and re-calc the fully diluted ownership accurately, especially where multiple notes carry different terms.

Secondary Sales And Founder Liquidity

Occasionally, founders or early angels sell a portion of their shares to new investors without issuing new shares. This doesn’t change the total share count but does change who holds them - so your cap table must capture the transfer and any changes to voting control.

Share Splits/Consolidations

To achieve a cleaner price per share for a round or to meet scheme requirements, companies sometimes split or consolidate shares. The cap table should apply the same ratio across all holders and instruments and note the effective date and resolutions authorising the action.

Board And Investor Reporting

Investors typically want a cap table snapshot with each board pack or after material changes. Build a simple habit: when you draft the board minutes authorising an issuance or grant, export an updated cap table snapshot at the same time and file them together.

Regulatory Compliance Touchpoints

When the cap table changes, there are usually compliance tasks. In the UK, that can include SH01 filings for new allotments, updating PSC details, issuing share certificates, and keeping your statutory registers and confirmation statement accurate. Treat these tasks as part of “closing” any equity transaction so your legal records match the numbers.

Key Takeaways

• A cap table is your company’s live map of ownership - keep it accurate, show fully diluted percentages, and link every change to the authorising documents and Companies House filings.
• Decisions in your Articles of Association and your Shareholders Agreement flow straight into the cap table: share classes, pre-emption, transfer rules, vesting and leaver provisions all affect who ultimately owns and controls your company.
• Plan your option pool early and reflect it on your cap table. If you’re offering employee equity, consider EMI Options for tax efficiency and clearer documentation.
• Before any round or instrument is signed, model the dilution. Look at both issued and fully diluted views - and watch the cumulative effect of convertibles and option pool increases on founder ownership.
• Keep your legal and statutory records in sync with the cap table: registers of members, PSC information, SH01s and your confirmation statement should all align. Use formal documentation for any Share Transfer or buy-back.
• Protect founder and team equity over time with clear vesting arrangements (for example via a Share Vesting Agreement) and stay alert to Share Dilution as you fundraise and grow.

If you’d like help setting up or reviewing your cap table, or you need properly drafted documents to support it, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.