Define: Acting in Concert

What Acting in Concert Means in a Contract

Acting in concert refers to a situation in which two or more parties, who remain legally separate, coordinate their actions toward a shared purpose. The coordination may arise from an explicit understanding or from a pattern of behaviour that shows the parties are working together, even without a signed agreement between them. Contracts introduce this concept to capture cooperation that falls short of formal partnership or agency but is still significant enough to affect rights, obligations, or risk.

The term is most commonly seen in provisions dealing with change of control, shareholder voting, competition restrictions, or conflicts of interest. It allows drafters to address situations where individuals or entities pool influence, votes, or resources to achieve an outcome that a single party acting alone could not achieve. Because the cooperation can be informal, contracts often define the term carefully so that it captures real coordination without sweeping in unrelated or coincidental alignment of interests.

In practice, acting in concert clauses are protective. They exist to prevent parties from circumventing thresholds, restrictions, or disclosure duties by splitting activity across multiple related actors. A shareholder agreement, for instance, might treat several small stakeholders who vote together as a single block for the purposes of triggering a mandatory offer requirement.

How Acting in Concert Is Defined or Measured

Because acting in concert depends on behaviour rather than a formal legal status, contracts and the law governing the contract typically rely on a combination of factors to establish whether it exists. These factors often include the presence of any agreement, arrangement, or understanding between the parties, whether formal or informal, and whether the parties have a common purpose or objective that their coordinated conduct serves.

• Evidence of communication or coordination between the parties before or during the relevant conduct.
• A shared or aligned commercial objective, such as acquiring control of a company or influencing a vote.
• Consistency of action that would be unlikely to occur by coincidence alone.
• Any financial, contractual, or personal relationship connecting the parties.

Courts and regulators applying the law governing the contract generally look at the substance of the relationship rather than its label. A written contract that expressly states that parties are not acting in concert will not be conclusive if their actual conduct suggests otherwise. This is why many agreements, including a