According to the BSE's rules the shares traded on the bourse’s official market have a dynamic price range of 5.0% of the reference price, and the static price range is set at 10% of the last price achieved in an auction. The bourse can expand the price range by up to 30% for a single trading session to prevent suspension of trading.
The Sofia bourse's blue-chip SOFIX index rose 0.2% to 527.82 points and the broader BG 40 index gained 1.55% to 145.28 by 0845 GMT on Tuesday.
European markets rose in early trade on Tuesday breaking a five-day losing streak, backed by a surge in Asian markets.