Corporate Law: Shareholder Agreements for Ontario Corporations

Reviewed for Ontario legal-marketing accuracy — August 2026

Shareholder Agreements for Ontario Corporations: Issues to Consider

An incorporated business with two or more shareholders can benefit from discussing expectations before a disagreement, departure or unexpected event occurs. A shareholder agreement can supplement the corporation’s articles, bylaws and applicable legislation, including Ontario’s Business Corporations Act (OBCA).

What can a shareholder agreement address?

The appropriate terms depend on the business, ownership structure, financing and the shareholders’ objectives. Common subjects include:

• Governance and reserved decisions: board composition, voting thresholds and decisions requiring enhanced or unanimous approval.
• Share transfers: permitted transfers, rights of first refusal, pre-emptive rights and procedures for third-party offers.
• Departures and buyouts: what happens on retirement, resignation, termination, death, disability, bankruptcy or a material breach.
• Valuation and funding: how a purchase price will be determined, payment terms and whether insurance may fund a death or disability buyout.
• Deadlock resolution: negotiation, mediation, arbitration or a buy-sell mechanism. A “shotgun” clause can have significant consequences, particularly where shareholders have unequal financial resources, and is not suitable in every case.
• Confidentiality and restrictive covenants: carefully tailored provisions concerning confidential information, solicitation and competition. Enforceability depends on the context and drafting; broad restrictions may not be enforceable.

The OBCA and unanimous shareholder agreements

The OBCA provides a statutory framework for Ontario corporations. Section 108 recognizes a written unanimous shareholder agreement that restricts, in whole or in part, the directors’ powers to manage or supervise the corporation’s business and affairs. Where powers are transferred from directors, corresponding rights, duties and potential liabilities can also shift to the shareholders. This is one reason the document should be drafted for the particular corporation rather than copied from a generic template.

When should the agreement be reviewed?

Ideally, shareholders address these issues when the company is formed or before a new shareholder is admitted. Existing agreements should also be reviewed when ownership, financing, key personnel, insurance, tax planning or the nature of the business changes.

Each shareholder may have different interests. Independent legal, tax and accounting advice may be appropriate before an agreement is signed.

This article provides general information about Ontario law and is not legal advice. It does not address every corporate, securities, employment, tax or contractual issue. Reading it does not create a solicitor-client relationship. Obtain advice based on your corporation’s facts before acting.