Agreements made on a given date under which an employee has the right to purchase a given number of shares of the employer's stock at a stated price either at a stated time or within a period of time immediately following the vesting date.
The definition of the concept is consistent with Regulation (EU) No 549/2013 of the European Parliament and of the Council of 21 May 2013 on the European system of national and regional accounts in the European Union.