How many shareholders need to be present for a shareholders' meeting to be valid in Ontario?

The Ontario Business Corporations Act provides a default quorum for shareholders' meetings: a quorum is present if the holders of a majority of the shares entitled to vote at the meeting are present or represented by proxy. In a corporation with two shareholders each holding fifty percent, both must be present or represented for quorum.

However, the default can be modified. A corporation's articles or bylaws can set a different quorum requirement, and it is common for shareholders' agreements to specify custom quorum rules — especially to prevent one shareholder from holding a meeting without the other.

In small private corporations, quorum is rarely a problem in practice because the shareholders and directors are often the same people and are aware of all meetings. The issue becomes more relevant when one shareholder is unavailable, uncooperative, or deceased. Some bylaws allow the meeting to proceed with a reduced quorum after a postponement period if a quorum is not initially met. Understanding your corporation's quorum rules before a dispute arises is worthwhile, particularly in a multi-shareholder corporation where relationships may become strained. If quorum deadlocks become a pattern, a corporate lawyer can help structure governance to reduce the risk.