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Do you actually need a shareholders' agreement?

Plenty of companies never have one — right up until two founders fall out, someone wants to leave, or an investor asks to see it.

If you own 100% of the shares and have no plans to bring anyone in, no — not yet. From the moment there are two shareholders, yes, and the reason fits in a sentence: without an agreement, a co-founder who walks out in month six keeps their entire shareholding for ever, while everyone still working in the business builds the value for them.

Nothing in your articles of association stops that. The model articles most companies adopt off the shelf are deliberately generic and say close to nothing about what owners actually fall out over.

Ten questions will tell you where you stand: the free shareholder agreement readiness check returns exactly which protections you have and which you do not.

What the default position actually is

With no agreement you fall back on the Companies Act 2006 and your model articles. That means four things, and none of them are edge cases:

Those four situations are what end multi-owner companies. An agreement exists to give each of them a pre-agreed answer.

What an agreement covers

The good ones are surprisingly short. They do not try to predict every eventuality — only to settle the handful that do real damage.

It is often worth more to the minority

A shareholder with 20% has almost no power under the default rules: they cannot block an ordinary resolution, cannot force a dividend, and can be left behind if the majority sells. Reserved matters and tag-along rights give a minority concrete protection the Companies Act does not offer on its own. Draw the reserved list carefully in either direction — too long and nothing gets decided, too short and it protects nobody.

How it sits alongside your articles

The articles are your company's public constitution, filed at Companies House and readable by competitors, customers and prospective staff. The agreement is a private contract between the shareholders that never appears on the register, which is why the commercially sensitive terms live there: valuation, leaver treatment, control, dividend policy. The two have to be drafted to work together — the common and expensive failure is an off-the-shelf set of articles permitting a share transfer the new agreement was written to prevent, so whenever an agreement goes in, the articles get read alongside it and amended where they conflict.

In practice — illustrative example

The 50/50 that froze

Two founders each hold half of a growing consultancy and have never signed anything beyond the model articles. When they fall out over strategy, neither can outvote the other, neither can force a buyout, and no decision can be made at all. The business keeps trading but cannot hire, invest or pivot — a textbook deadlock that one clause would have resolved. Untangling it afterwards, with solicitors on both sides, costs many times the price of the agreement and takes months nobody can spare.

When to do it

Before the next person joins the cap table. The terms are a negotiation, and the price of that negotiation is set by how much anyone has to lose at the time you have it. Agreeing that a founder who leaves in year one hands back most of their equity is an easy conversation before anyone has left and a nearly impossible one afterwards.

Do it now if any of these is already true: there is more than one shareholder; the split is uneven, or exactly 50/50; someone is taking equity for future work rather than paying cash for their shares; you are raising outside investment, which usually comes with the demand for one anyway; or not every shareholder works in the business day to day.

What it costs and what happens next

A shareholder agreement starts at £1,250 +VAT as a fixed fee, and that includes reading your existing articles to check the two documents do not contradict each other. Drafting one is non-reserved work, so no solicitor is legally required. Two things sit outside the fee and are worth planning for: tax advice on share structures or anything needing HMRC clearance, which goes to your accountant, and a formal valuation of the company, which is a separate exercise.

One point of principle before you start. We act for the company, not for individual shareholders, so each owner should take their own advice before signing — and a shareholder dispute that has already turned adversarial is contentious work for RHF Solicitors (SRA no. 324115). To get moving, run the free readiness check, then book a legal review. The full detail is in our guide to shareholder agreements, and if you are a director as well as a shareholder, read it alongside a director's seven legal duties.

This is general legal information, not advice on your situation. For advice tailored to your business, book a legal review. Buzz Legal provides non-reserved business legal support; reserved legal activities are carried out by RHF Solicitors, authorised and regulated by the SRA (no. 324115).

Common questions

Is a shareholders' agreement legally required?

No. A company can run on its articles of association alone, and thousands do. The real question is what the default answers are when something happens, and the model articles are close to silent on the things owners actually fall out about: whether a departing founder keeps their shares, how a 50/50 disagreement gets broken, whether anyone can be made to sell, and who can block a major decision. Without an agreement, a founder who walks out in month six generally keeps their full stake for ever, and the people still working in the business build value for someone who left. That single fact is why most multi-owner companies eventually put one in place.

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

The articles are the company's public constitution, filed at Companies House and readable by anyone, including competitors and prospective employees. A shareholders' agreement is a private contract between the shareholders and never appears on the register, which is why the commercially sensitive terms live there: leaver provisions, drag and tag rights, deadlock mechanisms, dividend policy, and what each owner is expected to contribute. The two have to be drafted to work together. A common and expensive failure is an off-the-shelf set of articles permitting a share transfer the new agreement was written to prevent, so whenever an agreement goes in, the articles get read alongside it and amended where they conflict.

When is the best time to put one in place?

Early, while everyone is aligned and nothing is in dispute. The terms of a shareholders' agreement are a negotiation, and the price of that negotiation is set by how much anyone has to lose at the time you have it. Agreeing that a founder who leaves in year one hands back most of their equity is an easy conversation before anyone has left and a nearly impossible one afterwards. The second-best time is now. Plenty of companies put one in years later, usually because an incoming investor or a new co-founder forces the question, and that works too — it is simply harder, slower and more expensive than it needed to be.

What happens to a shareholder's shares if they die?

Without provisions dealing with it, the shares pass under the shareholder's will, so the surviving owners can find themselves in business with a spouse, a child or a beneficiary who has no involvement in the company and no interest in running it. That person inherits the votes as well as the value. A shareholders' agreement can set a pre-agreed route: the remaining shareholders or the company buy the shares at a fair value on an agreed basis, often within a defined period. The usual companion is life insurance written so the money to fund that purchase actually exists, because without the funding a well-drafted buyout clause is a promise nobody can afford to keep.

Does a shareholders' agreement only protect the majority?

No, and it is often worth more to a minority. A shareholder with 20% has almost no power under the default rules: they cannot block an ordinary resolution, cannot force a dividend, and can be left behind if the majority sells. An agreement changes that with reserved matters — a defined list of significant decisions such as issuing new shares, taking on major borrowing or selling the business, which require a higher level of consent than a simple majority — and with tag-along rights letting a minority join a sale on the same terms. Draw the reserved list carefully: too long and nothing gets decided, too short and it protects nobody.

We are 50/50 and we cannot agree. What does an agreement do about that?

It provides a deadlock mechanism, which is the main reason 50/50 companies need one most and have one least. Without it, an even split with no casting vote means no resolution passes, the company stops making decisions, and the remaining routes are a negotiated buyout, an unfair prejudice petition or a just and equitable winding-up petition — ending the company in order to resolve the argument. Agreements handle it with a chairman's casting vote, an escalation to mediation, or a buy-sell mechanism where one owner names a price and the other chooses whether to buy or sell at it. None of them are pleasant. All of them beat paralysis.

What does one cost, and does it need a solicitor?

A shareholder agreement starts at £1,250 +VAT as a fixed-fee job, and that includes a read-through of your existing articles to check the two documents do not contradict each other. Drafting it is non-reserved work, so a solicitor is not legally required. Two things sit outside the fee and are worth planning for: tax advice on share structures or anything needing HMRC clearance, which goes to your accountant, and a formal valuation of the company, which is a separate exercise. One point of principle before you start — we act for the company, not for individual shareholders, so each owner should take their own advice before signing, and an already-adversarial shareholder dispute goes to RHF Solicitors.

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