What is dilution and how can shareholders in an Ontario private company protect themselves?

Dilution occurs when a corporation issues new shares, which reduces the ownership percentage of existing shareholders even though the number of shares they hold stays the same. For example, if you own 100 shares out of 1,000 total (10%), and the corporation issues 1,000 more shares to a new investor, you suddenly own 100 out of 2,000 (5%). Your economic and voting percentage has been cut in half.

In an Ontario private corporation, dilution is a real risk because shares can be issued by a board resolution alone (subject to the articles and any shareholder agreement). The key protections are pre-emptive rights (discussed separately), which give you the right to buy into new issuances to maintain your percentage, and share issuance provisions in the shareholder agreement that require shareholder approval above a certain threshold before new shares can be issued.

Dilution is not always harmful — a well-funded company whose shares become proportionally less per shareholder but more valuable overall can be a good outcome. But unexpected or unfair dilution — particularly in a situation where majority shareholders issue new shares to themselves or insiders at below-market prices — can be damaging. If you are a minority shareholder in a private corporation and your shareholder agreement doesn't protect you from dilution, this is a significant gap to address.