The story
The BET index was introduced on 19 September 1997, two years after the re-establishment of the Bucharest Stock Exchange, with an initial value of 1,000 points. It started with ten companies and a total market capitalization of 443 million Romanian lei (RON). Over time, the number of constituents has varied between a minimum of 10 and a maximum of 20 companies, based on liquidity and quality criteria.
In 2015, the index methodology was enhanced to include qualitative criteria related to transparency, reporting quality and investor communication, in addition to the quantitative liquidity metrics. Since its launch, 36 different issuers have been part of the BET index at various points in time.
From Wikipedia’s article on BET Index, shared under CC BY-SA 4.0.3
