# What Is a Shareholders' Agreement?

> A shareholders' agreement is a private contract between a company's owners that sets out how they will run it and what happens if things change. Here is what it covers and why it matters.

*Section: Business — By Marcus Vale (Editor-in-Chief & Business & Markets Editor) — Published February 6, 2025 — 6 min read*

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Tags: shareholders agreement, company law, business partners, equity, governance

## Key takeaways

- A shareholders' agreement is a private contract between some or all of a company's shareholders governing how the company is run and how their relationship works.
- It complements the articles of association but is confidential and can cover things the articles cannot, such as restrictive covenants.
- Key provisions handle decision-making, dividends, share transfers, what happens on exit or death, and how disputes are resolved.
- Without one, the Companies Act 2006 and your articles fill the gaps — often in ways the founders would not have chosen.
- The cheapest time to agree one is at the start, when everyone is optimistic and aligned.

A shareholders' agreement is a private contract between the owners of a company that sets out how they will run it and what happens when circumstances change. In one sentence: it is the rulebook the founders agree among themselves, covering everything from who decides what to what happens if one of them wants to leave. It is one of the most useful — and most neglected — documents a company with more than one owner can have.

The trouble is that shareholders' agreements feel unnecessary at exactly the moment they are easiest to write. When a company is founded, the owners are usually friends, family or trusted colleagues, full of optimism and reluctant to plan for fallings-out. Years later, when interests have diverged or someone wants out, the absence of an agreement turns a routine event into an expensive standoff. This guide explains what a shareholders' agreement is, what it covers, and why agreeing one early is one of the smartest moves co-owners can make. It is general information, not legal advice.

## What a shareholders' agreement is

A shareholders' agreement is a contract entered into by some or all of a company's shareholders. It governs their relationship as owners and how the company is to be managed. Unlike the company's articles of association, it is **private** — it is not filed at Companies House and the public cannot see it.

That privacy is part of the point. The agreement can contain commercially sensitive arrangements the owners would rather not publish, and it can bind the parties to things the articles cannot easily cover, such as agreeing not to set up a competing business.

## How it differs from the articles of association

Every UK company has **articles of association** — its public constitution, registered at Companies House and binding on all shareholders, present and future. Most companies adopt the standard "model articles" and leave it there.

A shareholders' agreement sits alongside the articles and does a different job:

- The **articles** are public, bind everyone automatically, and set out the basic constitutional framework.
- The **shareholders' agreement** is private, binds only those who sign it, and handles the relationship between the specific owners in detail.

Because the two documents can overlap, they need to be drafted to work together. Where a well-advised company wants a provision to bind every future shareholder, it goes in the articles; where it wants confidentiality or to bind only the current owners, it goes in the agreement. The agreement also shapes the practical business of ownership — for example how the owners take decisions, which is where it connects to [running an effective board meeting](/business/how-to-run-a-board-meeting).

## What a shareholders' agreement typically covers

There is no fixed template, but the following provisions appear in most well-drafted agreements.

| Area | What it addresses |
| --- | --- |
| Decision-making | Which decisions need unanimous or special consent (so a majority cannot ride roughshod over a minority) |
| Dividend policy | When and how profits are distributed |
| Share transfers | Restrictions on selling shares, and pre-emption rights giving existing owners first refusal |
| Issuing new shares | How dilution is handled when new capital comes in |
| Exit provisions | What happens when a shareholder wants to leave, retires, dies or is removed |
| Restrictive covenants | Agreements not to compete or poach staff and customers |
| Dispute resolution | How deadlocks and disagreements are broken |

Two areas deserve a closer look.

### Protecting minority shareholders

A shareholder with less than 50% has limited power under company law alone. A shareholders' agreement can give minority owners real protection — for example, by requiring their consent for major decisions such as taking on large debts, changing the business, or paying directors above a set level. Without that, a majority owner can make decisions a minority dislikes but cannot stop.

### Share transfers and exit

What happens when an owner leaves is where the absence of an agreement bites hardest. Good drafting answers the awkward questions in advance: Can a departing shareholder sell to anyone, or must they offer their shares to the others first? How is the price set? What happens to the shares of someone who dies, or who is also an employee and leaves the business? These "good leaver / bad leaver" terms prevent a co-owner's exit — or their estate inheriting a stake — from destabilising the company. Thinking this through connects directly to [succession planning](/business/succession-planning-basics) for any business that hopes to outlast its founders.

## What happens without one

If co-owners never sign a shareholders' agreement, the gaps are filled by the Companies Act 2006 and the company's articles. That default regime is workable, but it reflects general rules, not the founders' specific wishes. In practice that often means:

- A simple majority can outvote a minority on most matters.
- There may be no restriction on a shareholder selling their stake to an outsider.
- No automatic mechanism exists to buy out a departing or deceased owner.
- Deadlock between two 50/50 owners can paralyse the company, with the courts as the only exit.

None of these is fatal, but each is the kind of problem that a few pages agreed at the outset would have avoided.

## When to put one in place

The honest answer is: as early as possible, ideally when the company is formed or when a second owner comes in. The reason is simple — an agreement requires consent, and consent is cheapest when everyone is aligned and no one yet has a reason to hold out. If you are at the stage of [raising investment](/business/how-to-raise-investment), expect investors to insist on one anyway, because it protects their stake too.

Realistically, many companies reach the point of needing an agreement only when a problem looms. It is not too late — but it is harder, because the terms now have visible winners and losers. If that is you, treat it as urgent rather than impossible.

## Getting it drafted

A shareholders' agreement is a bespoke legal document, and this is one area where paying for advice is usually worth it. The cost is modest relative to the value of the company and tiny relative to the cost of a dispute. A solicitor will make sure the agreement and the articles line up, that the provisions are enforceable, and that the document reflects how the owners actually intend to work together rather than a generic precedent.

Before you instruct anyone, it helps to have a frank conversation among the owners about the hard questions — decision-making, dividends, what happens if someone leaves — so the lawyer is drafting your deal, not inventing one.

## The bottom line

A shareholders' agreement is a private contract between a company's owners that sets out how the business is run and what happens when things change — decision-making, dividends, share transfers, exits and disputes. It complements the public articles of association but can do things the articles cannot, and it binds only those who sign. Without one, the law and your articles fill the gaps, often in ways the founders would not have chosen. The cheapest, simplest time to agree the terms is at the start, when everyone is optimistic. If you co-own a company and have never written one, it is the single most valuable piece of housekeeping on your list.

## Frequently asked questions

### Is a shareholders' agreement legally binding?

Yes. It is a contract between the parties who sign it and is enforceable like any other contract. However, it binds only those who sign, so a new shareholder is not automatically caught unless they agree to be bound, which is why agreements often require incoming shareholders to sign up.

### What is the difference between a shareholders' agreement and the articles of association?

The articles are the company's public constitution, filed at Companies House and binding on all shareholders. A shareholders' agreement is a private contract between specific shareholders, kept confidential, and can include matters the articles cannot, such as non-compete clauses. Where they conflict, careful drafting is needed.

### Do I need a shareholders' agreement if I own 100% of the company?

No. A shareholders' agreement governs the relationship between two or more owners. If you are the sole shareholder there is no one to agree with, though you may want one later if you bring in investors or co-owners.

### Can a shareholders' agreement be changed later?

Yes, but usually only with the consent of all the parties to it, or whatever threshold the agreement itself specifies. That is why getting the terms right at the outset matters — amending it later requires agreement that may be harder to reach once interests diverge.

## Sources

- [GOV.UK — Running a limited company](https://www.gov.uk/running-a-limited-company)
- [Companies House — Guidance](https://www.gov.uk/government/organisations/companies-house)
- [Institute of Directors — Director resources](https://www.iod.com/resources/)

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