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 1.69% to 532.24 points and the broader BG 40 index gained 0.65% to 148.36 by 0835 GMT on Wednesday.
Markets in Asia and Europe rose in early trade on Wednesday.