Constitutional Documents of a Company in the UK

When you register a limited company in the UK, you don’t just get a company number and call it a day. You’re also creating the “rulebook” that governs how your business operates - your constitutional documents.

If that sounds a bit abstract, don’t worry. In practice, these documents are just the core rules about who can do what, how decisions are made, and what happens when things change. Get them right, and you’ll save yourself a lot of headaches as you grow.

In this guide, we’ll demystify what counts as the constitutional documents of a company under UK law, how they work, when to update them, and the practical records you should keep from day one.

What Are The Constitutional Documents Of A Company?

Under the Companies Act 2006, a company’s “constitution” is primarily its Articles of Association, together with any resolutions or agreements that effectively amend or supplement those Articles (for example, a shareholder special resolution changing share rights). Think of this as the living rulebook for how your company is run.

Key points to understand:

• The Articles of Association are the core rules of your company. They set out director powers, shareholder rights, decision-making processes and more. Many new companies adopt the “Model Articles” by default, but you can (and often should) tailor them.
• Special resolutions (generally 75% approval) can change the Articles. Once passed, those changes become part of your constitution and must be filed at Companies House.
• Certain shareholder agreements or class rights variations can affect the constitution where they amend the Articles or are required to be filed. Most private shareholder agreements sit alongside the constitution, binding the signatories, but won’t automatically override the Articles unless mirrored there.

Why this matters: your constitution controls how decisions are made, how shares are issued or transferred, how dividends are declared, and what happens during disputes or exits. If you plan to raise investment, bring on co-founders, or set clear governance, your constitutional documents are the foundation.

Articles Of Association: The Heart Of Your Company’s Rules

Your Articles of Association are the main constitutional document. They can be minimal (the Model Articles) or tailored to your business. If you’re serious about growth, you’ll usually want a bespoke set that anticipates real-world scenarios and reduces the risk of disputes.

Model Articles vs Bespoke Articles

The Model Articles cover the basics and are fine for many simple, single‑founder companies. However, they often lack the nuance a multi‑founder, investor‑backed or rapidly scaling business needs.

Common areas where bespoke drafting helps:

• Director decision‑making and reserved matters requiring shareholder approval
• Clear share classes and economic rights (dividends, liquidation preferences, voting)
• Allotment pre‑emption rights (who gets first refusal on new shares)
• Share transfer restrictions (e.g. lock‑ins, good/bad leaver provisions)
• Drag‑along and tag‑along mechanics for exits
• Quorum and voting thresholds aligned with your cap table and governance model
• Borrowing powers and conflict‑of‑interest procedures

If you’re tailoring your Articles, it’s wise to have them professionally drafted. Your Articles of Association will be relied on by directors, investors, accountants, and (if needed) the courts - so clarity is everything.

What Do The Articles Typically Cover?

While every company is different, most Articles will address:

• Objects/purpose (usually unrestricted for flexibility)
• Share capital, classes and rights
• Issue of new shares and pre‑emption
• Transfer of shares and compulsory transfers in defined scenarios
• Dividends, distributions and reserves
• Director appointments, removals, powers and proceedings
• Shareholder meetings, written resolutions and voting
• Indemnities and limitations of director liability to the extent permitted by law
• Administrative matters (e.g. notices, seal, company records)

Entrenched Provisions

Under the Companies Act 2006, certain provisions in the Articles can be “entrenched” so they’re harder to change than the usual 75% special resolution. Entrenchment can make sense for key investor protections or founder control mechanisms - but it reduces flexibility. Consider carefully which provisions (if any) you want entrenched and how that might affect later funding rounds.

Beyond The Articles: Memorandum, Registers And Company Resolutions

Your constitution goes beyond just the Articles. There are other documents and records that, while not always labelled “constitutional,” sit at the core of how your company is governed and evidenced day‑to‑day.

Memorandum Of Association

This is the short Companies House form signed by the initial subscribers when you incorporate. It states they agree to form the company and take at least one share each. It’s a historical record rather than a living document and can’t be changed after incorporation.

Statutory Registers And Share Certificates

Every company must maintain accurate statutory registers, including the register of members (shareholders), directors, directors’ residential addresses, secretaries (if any), charges (for older companies), and the register of persons with significant control (PSC). You should also issue share certificates promptly when shares are allotted or transferred. Keeping these up to date isn’t optional - it’s a legal requirement and critical to proving ownership.

If you’re formalising ownership changes, make sure your records are tidy and consistent; your share certificates and member registers are the first things investors and buyers ask to see.

PSC Register

Most UK companies must identify and record the individuals or legal entities who exercise significant control (generally over 25% of shares or voting rights, or otherwise significant influence) and keep this information up to date. There are criminal penalties for failing to comply, so take this seriously and refresh it when your cap table changes.

For a deeper dive on identifying controllers and recording changes, see practical guidance around people with significant control.

Board Minutes And Shareholder Resolutions

Corporate decisions are made either by the board or by the shareholders. Those decisions should be properly authorised and recorded.

• Board decisions are typically made by simple majority at a quorate meeting or via written resolutions. Keep minutes and file necessary Companies House forms (e.g. on appointments or share allotments).
• Shareholder decisions are taken by ordinary or special resolution. An ordinary resolution (simple majority) handles most routine matters; a special resolution (75% approval) is required for key constitutional changes, name changes, and certain share capital actions.

If you’re unsure which threshold applies, check the Companies Act and your Articles. A quick refresher on ordinary vs special resolutions can help you avoid invalid decisions. And when you do pass them, make sure they’re recorded properly - solid habits around board resolutions keep you compliant and investor‑ready.

Do You Also Need A Shareholders’ Agreement?

Strictly speaking, a shareholders’ agreement isn’t a constitutional document. It’s a private contract between the shareholders (and sometimes the company) that runs alongside your Articles and covers how you’ll work together. But in practice, it’s just as important for setting the ground rules and managing risk.

Why consider one:

• Day‑to‑day expectations: who does what, time commitments, and founder responsibilities
• Decision‑making: reserved matters requiring unanimous or super‑majority consent
• Leaver provisions: what happens if a founder leaves early, including buy‑back mechanics
• Deadlock and dispute resolution: mediation/escalation pathways so you don’t end up in gridlock
• Confidentiality and IP: ensuring the company owns the IP and protects sensitive information
• Exit planning: drag‑along/tag‑along provisions and how proceeds are shared

One crucial point: if there’s a conflict between your Articles and your shareholders’ agreement, the Articles will usually govern as far as the company is concerned. To avoid inconsistency, the two should be aligned - it’s common to update the Articles at the same time you sign (or renegotiate) a Shareholders Agreement.

How To Change Your Company’s Constitutional Documents (Safely)

As your business evolves, you may need to change your Articles (for example, adding new share classes, adjusting pre‑emption rights, or refining director powers). Here’s the safe, compliant way to do it.

1) Identify The Change And Who Must Approve It

Start by mapping what needs to change in the Articles and whether any investor protections or entrenched provisions are affected. Most changes require a special resolution (75% shareholder approval), but always check your current Articles to see if any higher thresholds or class consents are required.

2) Prepare The Drafting

Amendments are done by adopting new articles or passing specific amendments. Clarity is key - poorly drafted provisions create uncertainty and disputes. This is where professional drafting makes a big difference, especially around share rights and leaver mechanics.

3) Pass The Right Resolution

Convene a general meeting or use a written resolution, ensuring notice and procedural requirements are followed. Be precise about the wording of the resolution. Remember that an Articles amendment is not effective unless properly approved.

If documents need to be executed as deeds (for example, certain consents or ancillary agreements), make sure the signing formalities are correct. If you’re in doubt about who needs to sign and how, practical rules on executing contracts and deeds will help you get it right the first time.

4) File At Companies House On Time

File the special resolution and a copy of the amended Articles at Companies House within the statutory deadline (typically 15 days). Late or missing filings can cause delays, penalties, and confusion for investors, lenders and counterparties who rely on the public record.

5) Update Your Internal Records

Keep your company minute book tidy. Update meeting minutes, cap table, registers, and any investor documents that reference the Articles. Make sure everyone working from your constitution has the latest, correct version.

Key Takeaways

• Your company’s constitution centres on the Articles of Association and any shareholder resolutions or agreements that change them. Treat this as the living rulebook for how your business runs.
• Model Articles are a starting point, but bespoke Articles often make sense if you have co‑founders, investors, multiple share classes, or growth plans that need clearer guardrails.
• Keep core records up to date - especially your registers, share certificates, board minutes and shareholder resolutions. Don’t overlook PSC obligations; keep your PSC register accurate as your ownership changes.
• A shareholders’ agreement isn’t technically constitutional, but it’s essential for setting expectations, dealing with leavers and deadlock, and aligning day‑to‑day governance with your long‑term goals. Keep it consistent with your Articles of Association.
• Changing your Articles usually needs a 75% special resolution. Know the right thresholds, draft clearly, get the approvals, file at Companies House on time, and keep your internal records synchronised.
• When recording decisions, use the right mechanism - board minutes, written resolutions, and the correct voting thresholds. If you’re unsure, revisit the basics on ordinary vs special resolutions and good practice around board resolutions.
• If you’re preparing for investment or an exit, tidy constitutional documents and clean records (including share certificates and member registers) will speed up due diligence and build confidence.

Getting your constitutional documents right isn’t just a compliance box to tick - it’s how you protect your business, keep decision‑making smooth, and make your company attractive to investors. If you’d like tailored help drafting or updating your Articles, aligning a Shareholders’ Agreement, or documenting approvals, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no‑obligations chat.