Employee stock ownership, or employee share ownership, is where a company's employees own shares in that company (or in the parent company of a group of companies). US employees typically acquire shares through a share option plan. In the UK, Employee Share Purchase Plans are common, wherein deductions are made from an employee's salary to purchase shares over time. In Australia it is common to have all employee plans that provide employees with $1,000 worth of shares on a tax free basis. Such plans may be selective or all-employee plans. Selective plans are typically only made available to senior executives. All-employee plans offer participation to all employees (subject to certain qualifying conditions such as a minimum length of service). Most corporations use stock ownership plans as a form of an employee benefit. Plans in public companies generally limit the total number or the percentage of the company's stock that may be acquired by employees under a plan. Compared with worker cooperatives or co-determination, employee share ownership may not confer any meaningful control or influence by employees in governing and managing the corporation. Some companies, particularly private companies, use employee share ownership to support a company's culture. Employee ownership is when all employees together own a substantial stake and have a meaningful voice in the company (or group) that employs them. A number of countries have introduced tax advantaged share or share option plans to encourage employee share ownership. Types of plan To facilitate employee stock ownership, companies may allocate their employees with stock, which may be at no upfront cost to the employee, enable the employee to purchase stock, which may be at a discount, or grant employees stock options. Shares allocated to employees may have a holding period before the employee takes ownership of the shares (known as vesting). The vesting of shares and the exercise of a stock option may be subject to individual or business performance conditions. Various types of employee stock ownership plans are common in most industrial and some developing countries. Executive plans are designed to recruit and reward senior or key employees. In the U.S. and the UK there is a widespread practice of sharing this kind of ownership broadly with employees through plans in which participation is offered to all employees. The tax rules for employee share ownership vary widely from country to country. Only a few, most notably the U.S., the UK,