Bulgaria's First Investment Bank (Fibank) [BUL:5F4] was the top blue-chip gainer on the Bulgarian Stock Exchange (BSE) on Monday, bourse data shows. Fibank shares closed 4.36% higher at 3.83 levs ($2.3/1.95 euro) in a trading volume of 336 shares.Drug maker Sopharma [BUL:3JR] fell the most among blue chips, closing 0.72% lower at 4.2 levs. The blue-chip SOFIX index rose 0.07% to 638.33 points on Monday, after increasing by 0.21% on Friday. The BGBX40 index, which tracks the 40 most traded shares on the Sofia bourse, edged down 0.06% to 126.19 points, following a 0.05% decrease on Friday. The BG-REIT index, which tracks the performance of real estate investment trusts, fell by 0.10% to 115.25 points, after closing 0.09% lower on Friday. The BG TotalReturn30 index, in which companies with a free float of at least 10% have equal weight, lost 0.28% to 525.65 points on Friday, after falling 0.22% on Friday. Total trading turnover on BSE's regulated market rose to 1.6 million levs on Monday from 734,100 levs on Friday.