A Canadian Shareholder Agreement (also called a unanimous shareholder agreement or USA when signed by all shareholders) is a private contract among the shareholders of a corporation that supplements the corporation's articles of incorporation and bylaws. It governs how shares are transferred, how the corporation is managed, how disputes are resolved, and what happens when a shareholder wants to exit — addressing the gaps that the corporate statute leaves to the shareholders' discretion.

Shareholder agreements in Canada operate under either the Canada Business Corporations Act (CBCA, R.S.C. 1985, c. C-44) for federally incorporated companies or the applicable provincial Business Corporations Act — Ontario's Business Corporations Act (R.S.O. 1990, c. B.16), BC's Business Corporations Act (S.B.C. 2002, c. 57), or Alberta's Business Corporations Act (R.S.A. 2000, c. B-9). A unanimous shareholder agreement under CBCA s. 146 has the unique legal effect of restricting the directors' powers and transferring some or all of those powers to the shareholders, along with the corresponding liabilities and duties. This distinguishes it from a non-unanimous shareholder agreement, which binds only the signing shareholders and does not affect the board's statutory powers.

The CBCA provides minority shareholder protections through the oppression remedy (s. 241), which allows any shareholder, creditor, director, or officer to apply to court for relief where the corporation's conduct is oppressive, unfairly prejudicial, or unfairly disregards their interests. A well-drafted shareholder agreement reduces the likelihood of oppression claims by establishing agreed-upon rules for the issues that most commonly lead to shareholder disputes: dividend policy, executive compensation, capital calls, share dilution, and exit mechanisms.

Share transfers may trigger Competition Act (R.S.C., 1985, c. C-34) notification requirements if the transaction exceeds the prescribed thresholds under Part IX of the Act. The acquisition of shares in a Canadian corporation by a non-resident may also be subject to review under the Investment Canada Act.

When two or more individuals are incorporating a business together and need to define their respective ownership stakes, voting rights, management roles, and the process for resolving deadlocks before the first shares are issued — preventing the default statutory rules from governing their relationship.

When a startup corporation is raising capital from angel investors or venture capital funds and the investors require a shareholder agreement that includes anti-dilution protections, information rights, board representation, pre-emptive rights on future share issuances, and liquidation preferences.

When a family business is structured as a corporation and the family members who are shareholders need to address succession planning, share transfer restrictions to keep ownership within the family, the process for admitting the next generation, and the valuation methodology for buying out retiring family members.

When equal (50/50) shareholders need a deadlock resolution mechanism — such as a shotgun (buy-sell) clause, mediation, arbitration, or a casting vote procedure — to prevent complete operational paralysis when the shareholders cannot agree on a fundamental business decision.

When an employee or key contributor receives shares or stock options as part of their compensation and the corporation needs vesting schedules, repurchase rights upon termination of employment, and restrictions on the employee's ability to sell shares to third parties.

Without a shareholder agreement, the corporation operates under the default rules of the CBCA or provincial BCA, which provide majority rule for most decisions, no restrictions on share transfers, no mandatory buy-sell mechanisms, and no contractual protections for minority shareholders beyond the statutory oppression remedy.

Share Transfer Restrictions — Right of first refusal, right of first offer, or mandatory offer procedures that give existing shareholders the opportunity to purchase shares before they can be sold to a third party. These restrictions prevent unwanted outsiders from becoming shareholders and are the most fundamental provision in any shareholder agreement.

Shotgun (Buy-Sell) Clause — A deadlock resolution mechanism where one shareholder offers to buy the other's shares at a specified price per share. The recipient must either sell at that price or buy the offeror's shares at the same price. This creates a self-regulating valuation mechanism but can disadvantage the shareholder with less access to capital.

Drag-Along and Tag-Along Rights — Drag-along rights allow a majority shareholder selling to a third party to compel minority shareholders to sell on the same terms. Tag-along rights protect minority shareholders by giving them the right to participate in any sale on the same terms offered to the majority shareholder.

Board Composition and Voting — How directors are nominated and elected, whether specific shareholders have the right to appoint a certain number of directors, quorum requirements, and which decisions require a supermajority or unanimous vote (typically: amending the articles, issuing new shares, taking on major debt, selling all or substantially all assets, or entering into transactions above a defined threshold).

Dividend Policy — Whether dividends are declared at the board's discretion or according to a formula (such as a percentage of annual net income), the frequency of distributions, and any priority rights for specific share classes.

Non-Competition and Non-Solicitation — Restrictions preventing shareholders (particularly those involved in management) from competing with the corporation or soliciting its clients and employees during their tenure as shareholders and for a defined period after departure. These restrictions must satisfy the reasonableness test under Canadian common law (Shafron v. KRG, 2009 SCC 6).

Valuation Methodology — The formula or process for valuing shares when a buy-sell event is triggered: book value, fair market value determined by an independent valuator, a formula based on revenue or earnings multiples, or a combination. The valuation method significantly affects the price a departing shareholder receives and should be agreed upon in advance.

Death, Disability, and Departure — What happens when a shareholder dies, becomes permanently disabled, or voluntarily resigns. Typically includes mandatory purchase provisions, funded by life insurance or disability insurance, with the purchase price determined by the agreed valuation methodology.

Governing Law — Whether the corporation is federally (CBCA) or provincially incorporated, the province whose laws govern the agreement, and the dispute resolution mechanism (mediation, arbitration, or court proceedings including the availability of the oppression remedy).