Business & Commercial

Shareholder Agreements — Complete Guide

England & Wales · Companies Act 2006 · Updated May 2026

What is a shareholder agreement?

A shareholder agreement is a private contract between the shareholders of a company that governs how the company is run, how disputes between shareholders are resolved, and how shares can be bought and sold. Unlike the company's Articles of Association, a shareholder agreement is private and does not need to be filed at Companies House.

Why every company with multiple shareholders needs one

Without a shareholder agreement, all shareholder disputes are governed by the Companies Act 2006 and the company's Articles of Association. This creates serious risks:

Key provisions every shareholder agreement should cover

ProvisionWhat it does
Pre-emption rightsExisting shareholders get first refusal before shares are sold to an outsider
Drag along rightsMajority shareholders can force minority to sell to a buyer (prevents holdouts)
Tag along rightsMinority shareholders can join a sale on the same terms as majority
Deadlock provisionsMechanism to resolve 50/50 disputes — Russian roulette, shotgun, casting vote
Good leaver/bad leaverDifferent share valuation depending on why a shareholder-director leaves
Reserved mattersDecisions that require unanimous or supermajority consent regardless of share %
Non-compete/non-solicitRestrictions on departing shareholders competing or poaching clients/staff
Dividend policyAgreement on when and how dividends are declared

Deadlock — the 50/50 problem

A 50/50 split between two shareholders or groups is the most common source of company disputes. Without a deadlock resolution mechanism in the shareholder agreement, a deadlock can paralyse the company entirely. Common mechanisms include:

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