The shares of Bulgarian industrial group Stara Planina Hold [BUL:5SR] led the blue-chip gainers' list on the Bulgarian Stock Exchange on Monday, after gaining 2.22% and closing at 6.90 levs.The blue-chip SOFIX index, which tracks the 15 most liquid and capitalised stocks on the BSE, ended the session 0.28% lower at 630.07 points.Diversified group Doverie United Holding [BUL:5DOV] paced the blue-chip decliners on Monday, closing 2.91% lower at 1.67 levs.Financial and insurance group Eurohold Bulgaria's [BUL:4EH] was the most traded blue chip during the trading session, as 249,083 shares in the company changed hands, forming a turnover of 404,764 levs.Total trading turnover on the Sofia bourse rose to 655,800 levs ($335,305/389,743 euro) on Monday from 288,500 levs on Friday.The wider BGBX40 index, which tracks the 40 most traded shares on the Sofia bourse, dropped 0.52% to 121.64 points.The BGREIT index, which tracks the performance of real estate investment trusts, added 0.79% to 117.08 points on Monday.The BG TotalReturn30 index, in which companies with a free float of at least 10% have equal weight, lost 0.40% to 519.51 points.(1 euro = 1.95583 levs)