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July 15, 2026

Shareholders’ agreements: why every multi-founder company needs one

Launching a business with trusted partners rests on shared ambition and complementary skills. But commercial priorities, personal circumstances and investment plans rarely stand still, and the moment they diverge is precisely the moment a handshake stops being enough. A shareholders’ agreement sets out in advance and in writing how the company will be owned, run and, if necessary, unwound.

What the articles of association don’t do

Most UK companies are incorporated on the model articles prescribed under the Companies Act 2006^[1]. These are deliberately minimal: they say nothing about founder vesting, dividend policy, deadlock, exits or what happens when a shareholder dies or simply stops turning up. They are also filed on the public register at Companies House, where anyone including competitors can read them.

A shareholders’ agreement fills both gaps. It governs the relationship between the shareholders themselves, and it remains a private contract that never appears on the public record. That combination makes it the natural home for the commercially sensitive terms: reserved matters requiring shareholder approval, capital contribution obligations, voting arrangements, dividend policy and procedures for issuing new shares.

Founder conflict is the most preventable business risk

This is not a theoretical problem. Harvard Business School research by Noam Wasserman, drawing on data from roughly 10,000 founders, found that 65% of high-potential start-ups fail because of conflict among co-founders more than product, market and funding problems combined^[2]. The disputes rarely stem from bad faith; they stem from expectations that were never written down.

The legal fallback is unattractive. A minority shareholder locked in a dispute without contractual protections is usually left petitioning the court for unfair prejudice under section 994 of the Companies Act 2006^{[3 ]}litigation that is slow, expensive and unpredictable, and that frequently ends with a court-ordered share buy-out on terms neither side would have chosen. A shareholders’ agreement replaces that gamble with machinery agreed while everyone was still on good terms:

* Deadlock resolution from escalation and mediation through to buy-out mechanisms such as ‘Russian roulette’ or ‘Texas shoot-out’ clauses.

* Good and bad leaver provisions, so the price a departing founder receives reflects how they left.

* Share transfer restrictions and pre-emption rights, keeping equity out of unwanted hands.

* Confidentiality and restrictive covenants that survive a founder’s exit.

Investors will expect it anyway

Any company planning to raise external capital will meet these concepts eventually. The BVCA model documents the market standard for UK early-stage investment rounds, most recently updated in February 2025 are built around a subscription and shareholders’ agreement containing drag-along and tag-along rights, pre-emption on new issues, reserved matters and founder warranties^[4]. Founders who have already documented sensible arrangements negotiate from familiar ground and complete due diligence faster; those who arrive with nothing negotiate investor-drafted terms under time pressure.

Well-drafted provisions also protect both directions of the ownership relationship: minority holders gain tag-along rights and vetoes over dilutive issues, while majority holders gain drag-along rights that keep a future sale deliverable.

Death, incapacity and the April 2026 tax deadline

The hardest scenarios to discuss are the ones an agreement handles best. Without agreed machinery, a deceased founder’s shares pass under their will potentially handing a seat at the table to an estate with no interest in the business. The usual answer is a cross-option agreement backed by life insurance, giving the survivors an option to buy and the estate an option to sell at a pre-agreed valuation basis. Drafting matters here: a binding obligation to sell on death can forfeit inheritance tax business property relief, which is why options rather than firm commitments are used.

This area is about to become more consequential. From 6 April 2026, 100% business property relief will be capped after a December 2025 revision at £2.5 million of qualifying assets per individual, with relief above that level halved to 50%, producing an effective 20% inheritance tax charge on the excess^[5][6]. Shareholders in valuable private companies who last reviewed their succession provisions before this change have a concrete reason to revisit them.

Before signing

An agreement should reflect the company’s actual ownership and ambitions rather than a generic template. The questions worth settling include: whether voting rights track responsibilities as well as shareholdings; how future investors or employee share schemes will be accommodated; what happens on resignation, incapacity or death; how shares are valued on any transfer; and which disputes go to mediation or arbitration before anyone issues proceedings.

It is a living document. New investment, an acquisition, overseas expansion or a change in shareholder composition should each trigger a review the agreement that fitted two founders in a spare room rarely fits the same company after a funding round.

A shareholders’ agreement is ultimately a strategic governance tool rather than a legal formality. The companies that never need to enforce one tend to be the companies that took the trouble to sign one.