On 12 June 2000 shares of AB Bir Akcin Pieno Bendrov were replaced by shares of AB Lietuvos telekomas in the index base. The index enables investors to make decisions regarding the situation on the secondary T-bills market at a certain point in time or over a certain period of time, as well as about their price and yield fluctuations. Once a new T-bills issue is sold at the auction and paid for, i.e., on the day of its admission to the stock exchange listing, it is included into the index base. T-bills issues are removed from the index two business days prior to their redemption date, i.e., on the day of their delisting. Market price of each T-bills issue is determined based on the average price of all securities of a given issue traded on the central market on that day.
Index is calculated on a daily basis.
The number of constituents in the index changes according to the amount of T-bills traded at that time on the secondary market. During 1997 maximum number of issues in the index was 34, minimum 20. During 1998-1999 maximum number of issues in the index was 42, minimum 37. In 2000, the maximum number of T-bills issues equaled 37, while the minimum was 32. This index demonstrates yield of listed T-bills on the secondary market over a certain period of time.