Arizona Jury Instruction — 1.9.5.1, also known as Corporation as Alter Ego of Stockholder, is an important legal concept used in the state of Arizona. It focuses on the legal principle that recognizes the possibility of holding a corporation liable for the actions or debts of its shareholders or owners when it is determined that the corporation is being used as a mere instrumentality or alter ego of the stockholder. Keywords: Arizona Jury Instruction, Corporation, Alter Ego, Stockholder, Liability, Instrumentality, Legal Concept. This jury instruction is commonly used in cases where it is alleged that a corporation is simply a façade for the actions of its owner or a group of stockholders. The instruction helps the jury to understand that under certain circumstances, the corporate veil may be pierced, allowing the court to treat the corporation and the stockholders as one and the same. There are different types of situations where the Arizona Jury Instruction — 1.9.5.1 Corporation as Alter Ego of Stockholder might be applicable: 1. Corporate Fraud: This instruction can be utilized in cases where the shareholders or owners of a corporation have intentionally misrepresented the nature of the business or have used the corporation to perpetrate a fraud. It guides the jury in evaluating whether the corporation should be treated as the alter ego of the stockholder to hold them personally liable for their fraudulent actions. 2. Corporate Veil Piercing: In situations where shareholders use the corporation as a mere extension of their personal affairs, disregarding corporate formalities like separate bank accounts or meeting minutes, the court may consider piercing the corporate veil. The jury instruction would provide the framework for the jury to assess whether it is appropriate to hold the stockholders personally liable for the corporation's actions. 3. Personal Liability for Corporate Debts: This instruction can also come into play when a corporation fails to meet its financial obligations, and it is alleged that the corporation is the alter ego of the stockholder. In such cases, the court may hold the stockholders personally responsible for the corporate debts. In summary, Arizona Jury Instruction — 1.9.5.1 Corporation as Alter Ego of Stockholder is a crucial legal concept that enables the court and jury to evaluate the extent to which a corporation can be held liable for the actions or debts of its stockholders or owners. It aims to prevent the misuse of corporate entities as mere alter egos for individual shareholders and promotes fairness and accountability in the corporate realm.