The Bulgarian Stock Exchange blue-chip SOFIX index dropped 0.67% to 578.64 points on Thursday, largely due to a 6.00% fall in the share price of financial and insurance group Eurohold Bulgaria, bourse data showed. Other notable losers among the blue-chip companies on Thursday were drug maker Sopharma and software company Sirma Group Holding, which shed 2.36% and 1.44% of their share prices, respectively.Sopharma and Sirma Group were the top gainers among the members of the SOFIX on Wednesday. Eurohold also led decliners among members of the wider BGBX40 index and the equally-weighted BGTR30 index on Thursday.Shares in Eurohold Bulgaria rose 0.50% on Tuesday after the company said its consolidated operating revenue rose by 31% year-on-year in the first half of 2019. The group's consolidated net profit, excluding non-controlling interest, edged down to 4.0 million levs in the period under review, from 4.1 million levs in the corresponding period of 2018.The BGBX40, which tracks the 40 most traded shares on the stock exchange in Sofia, fell 0.06% to 114.19 points, while the BGTR30, in which companies with a free float of at least 10% have equal weight, advanced 0.68% to 509.29 points, supported by a significant rise in the share price of Holding Sveta Sofia.Holding Sveta Sofia's shares added 25.00% to 4.00 levs boosted by 17 trades worth 11,444 levs in total on Thursday.The BGREIT index, which tracks real estate investment trusts, closed unchanged. Total trading turnover on the regulated market increased to 1.8 million levs on Thursday from 764,900 levs on Wednesday.