Company Constitutional Documents: Articles, Shareholders’ Agreements & Governance

If you run a UK limited company (or you’re about to set one up), your company’s constitutional documents are the backbone of how the business is owned, controlled and kept accountable.

They’re not the flashy part of building a business, but getting them right early can save you a lot of stress later - especially when you take on investment, bring in a co-founder, appoint directors, or have a shareholder relationship start to wobble.

In this guide, we’ll break down what constitutional documents are, which documents matter most for SMEs, and how to keep your company governance practical (and legally solid) as you grow.

What Are Constitutional Documents (And Why Do They Matter For SMEs)?

In simple terms, a company’s constitutional documents are the documents that set out the rules for how your company is run under UK company law.

They cover things like:

• Who owns the company (and how ownership can change)
• How decisions are made (directors vs shareholders)
• What happens when someone wants to leave, sell shares, or disputes a decision
• How you issue new shares (for investment, employee incentives, or new co-founders)
• What powers directors have, and what needs shareholder approval

For most UK companies, the core constitutional documents (in the legal sense) are:

• Public governance rules (primarily your Articles of Association, filed at Companies House)
• Resolutions and decisions that change those rules (for example, a special resolution adopting new articles)

Alongside that, many SMEs also put in place private governance documents - most commonly a Shareholders’ Agreement. This is not part of the company’s constitutional documents under the Companies Act, but it can be just as important in practice for setting expectations and preventing disputes.

Even if your company is small - say, two founders and your first employee - these documents still matter. In fact, for SMEs they often matter more, because you’re usually relying on personal trust and informal arrangements. That works… until it doesn’t.

A common scenario we see is this: you and a co-founder start strong, split shares 50/50, and rely on “we’ll sort it out later”. Then you hit a hard decision (investment, hiring, product direction, someone wants out) and you realise there’s no clear mechanism to resolve it.

That’s exactly what good governance documents are there to prevent.

Your Articles Of Association: The Company Rulebook

Your Articles of Association are the company’s core internal rules. They’re effectively your company’s constitution.

When you register a company, you’ll either:

• adopt standard “model articles” (default rules set by law), or
• use bespoke articles tailored to your company.

For many early-stage companies, model articles can be “good enough” to get started. But as soon as you have multiple shareholders, external investment, different share classes, or more complex decision-making, model articles often don’t reflect how you actually want to run the business.

In practice, your articles commonly deal with things like:

• Director powers and how the board operates
• Voting rules for directors and shareholders
• Dividends and distributions (often at a high level)
• Share transfers (sometimes limited, sometimes broad)
• Issuing shares and pre-emption rights (existing shareholder rights to buy new shares first, where applicable)

If you’re not sure what your company currently has in place, it’s worth locating and reviewing your Articles of Association as a starting point.

Why “Model Articles” Can Be Risky For Small Businesses

Model articles aren’t “bad” - they’re just generic. And generic rules can create gaps, especially for SMEs where ownership and control are closely tied to a few people.

Common SME issues with model articles include:

• Deadlock risk (especially with 50/50 shareholders and no deadlock process)
• Weak leaver protection (what if a co-founder stops contributing but keeps their shares?)
• Limited investor-friendly terms (if you plan to raise funds, investors often expect certain governance controls)
• Unclear share transfer restrictions (which can matter if a shareholder wants to sell to a third party)

As your business grows, your articles are often the first document that needs updating - because they’re what the Companies Act framework looks to when determining how decisions should be made.

Shareholders’ Agreements: The Private Rules That Protect The Relationship

A Shareholders’ Agreement is a private contract between some or all shareholders. It’s not filed publicly. That makes it useful for SMEs, because it can contain commercially sensitive details while setting practical expectations for how shareholders work together.

If your articles are the “rulebook”, your shareholders’ agreement is the “relationship plan”.

A well-drafted shareholders’ agreement often covers:

• Decision-making: which matters need unanimous approval vs majority approval
• Reserved matters: decisions directors can’t make without shareholder consent
• Share transfers: restrictions, permitted transfers, right of first refusal
• Leaver provisions: what happens if a founder exits (including “good leaver” vs “bad leaver” outcomes)
• Drag-along and tag-along rights: rules for selling the company fairly
• Dividends and funding: expectations around reinvestment vs distributions and whether shareholders may be asked to contribute more capital (there can also be tax implications, so it’s worth getting tax advice)
• Dispute resolution: practical steps to resolve conflict before it becomes a legal dispute

It’s also common for SMEs to use a shareholders’ agreement to clarify what’s supposed to happen in situations that are awkward to raise - like what happens if someone gets sick long-term, wants to step back, or stops pulling their weight.

If you’re putting one in place (or reviewing one that’s outdated), the best starting point is a properly tailored Shareholders Agreement.

Do You Need Both Articles And A Shareholders’ Agreement?

Often, yes - because they do different jobs.

As a rough guide:

• Articles are essential and always exist in some form for a limited company.
• Shareholders’ agreements are optional, but strongly recommended once there is more than one shareholder (or where the shareholders have different expectations, roles or levels of involvement).

One key point: your articles and shareholders’ agreement should not contradict each other. If they do, you can end up with governance confusion (and disputes about which rule applies, and whether the agreement is enforceable against all relevant parties).

That’s why SMEs often update the articles at the same time as signing a shareholders’ agreement - to make sure everything aligns.

Company Governance In Practice: Directors, Shareholders, And Decision-Making

“Governance” can sound like something only large corporates worry about. But for SMEs, governance is simply the system you use to make decisions and prove those decisions were made properly.

At a basic level:

• Directors manage the company day-to-day.
• Shareholders own the company and vote on certain key matters reserved to them by law and the company’s documents.

Your documents set out where that line is drawn.

Board Decisions Vs Shareholder Decisions

Some decisions are typically made by directors (often via a board meeting or written resolution), such as:

• entering into supplier contracts
• approving operational budgets
• hiring senior staff (depending on your governance rules)

Other decisions are usually reserved for shareholders (either under the Companies Act, or because your articles/shareholders’ agreement say so), such as:

• changing the articles
• issuing new shares (often requiring shareholder authority, unless already granted)
• changing share rights or share classes
• major transactions (depending on your documents)

For SMEs, the practical challenge is that the same people are often both directors and shareholders - which can create blurred lines. The solution isn’t to overcomplicate things; it’s to document decisions clearly and follow your own process consistently.

Resolutions, Minutes, And Record-Keeping

Even if you run a lean team, you still need to keep proper company records. This isn’t just admin - it helps show decisions were made validly and can protect you if a decision is later challenged.

Common governance documents include:

• Shareholder resolutions (ordinary or special, depending on what you’re approving)
• Director resolutions (board decisions)
• Board minutes (a record of what was discussed and decided)

If you’re formalising decisions, it helps to have a clear Ordinary Resolution process, especially when approving shareholder-level matters.

And when it comes to documentation hygiene, keeping Meeting Minutes is one of the simplest ways to strengthen your governance without adding much cost or complexity.

Execution Basics: Signing, Witnessing, And Making Documents Enforceable

You can have beautifully drafted governance documents, but if they’re not executed properly, you might struggle to rely on them.

For SMEs, the most common execution issues include:

• someone signing in the wrong capacity (director vs individual shareholder)
• missing witnesses where required (for example, where an individual signs a deed)
• using the wrong signing block for a company
• failing to follow the company’s own signing authority rules

At a practical level, it’s worth making sure you understand Legal Signature Requirements before you finalise key company documents - particularly where you’re signing deeds, issuing shares, or granting rights that need to be enforceable for years.

When Do You Need A Witness?

Not every document needs a witness. Witnessing is commonly required when an individual signs a deed, and may be relevant depending on how a document is executed. Getting this wrong can create enforceability problems - which tends to come to light at the worst possible time (like during investment due diligence or a shareholder dispute).

As a general guide, it helps to know Who Can Witness A Signature, so you don’t end up re-signing documents later because the witness didn’t qualify.

Deeds And Higher-Risk Documents

Some documents are intended to be executed as deeds (for example, certain variations, guarantees, or documents where there’s no “consideration”). The signing formalities can be stricter.

If you’re dealing with documents that need deed execution, it’s worth checking the correct approach to Executing Contracts And Deeds so your governance documents don’t fall over on a technicality.

Updating Constitutional Documents: When To Review (And What Can Go Wrong)

Many SMEs set up their company once, file the initial articles, then don’t touch their company constitution again for years.

That’s understandable - you’re busy building the business.

But your articles (and any related governance documents, like a shareholders’ agreement) should be reviewed when something material changes, such as:

• you take on an investor
• you issue new shares (including creating different share classes)
• a co-founder leaves, or wants to step back
• you appoint new directors (especially non-founder directors)
• you start paying dividends regularly
• you want clearer rules around decision-making and control

Common Mistakes SMEs Make With Constitutional Documents

Some of the most common problems we see in small business governance are avoidable - usually with a bit of forward planning.

1. Relying on informal agreements
You might have a handshake deal about roles, salaries, or share ownership. That’s risky, because if memories differ later, you won’t have a reliable reference point.

2. Not planning for deadlock
Two equal shareholders can stall the company if they disagree. You need a mechanism (or at least a process) to break deadlock.

3. No exit plan
If a shareholder wants to leave, do they have to offer shares to existing owners first? Can they sell to a competitor? Are there valuation rules? These issues are much easier to deal with upfront than in the middle of a dispute.

4. Documents that don’t match reality
Your company may have evolved (new investors, changed roles, new directors), but the documents still reflect “day one”. That mismatch creates uncertainty - and uncertainty is where disputes start.

5. DIY templates that don’t fit
Governance documents need to reflect your exact ownership and control arrangements. Templates often miss important nuances (like different veto rights, share classes, or founder vesting expectations).

None of this is about creating red tape. It’s about making sure your business can run smoothly even when things get complicated - because growth almost always brings complexity.

Key Takeaways

• Constitutional documents (primarily your Articles of Association) set the formal rules for how your company is owned, controlled and managed, and they’re a crucial part of protecting your business from day one.
• Your Articles of Association are your company’s core constitution and are usually the first place to look when clarifying decision-making and shareholder rights.
• A Shareholders’ Agreement is a private contract that can protect founders and investors by setting clear rules for control, exits, disputes and share transfers.
• Good governance for SMEs doesn’t need to be complex - but you should document key decisions properly using resolutions and meeting minutes.
• Even strong documents can cause problems if they’re not signed correctly, witnessed properly (where needed), or kept aligned as the business changes.
• It’s smart to review and update your articles and related governance documents when you raise funds, issue shares, change directors, or bring in (or lose) a key shareholder.

This article is general information only and doesn’t constitute legal advice. It doesn’t cover tax advice - speak to a qualified adviser about your specific circumstances.

If you’d like help reviewing or drafting your company’s constitutional documents, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.