Bulgarian stocks closed lower Monday at the Bulgarian Stock Exchange, with the benchmark Sofia Index finishing at 478.30 points, down 12.90 points, or 2.63 percent, from the previous close. The BG 40 Index, which is based on the issues of shares of the top 40 companies graded by the number of transactions executed in the last six months, closed at 131.87 points, down 1.83 points, or 1.37 percent, from the previous close. The BG REIT Index decreased 0.88 point or 1.81 percent to 47.79 points. The BG TR30 Index (BG Total Return 30) dropped 7.51 points, or 2.04 percent, to 360.43 points. The total daily turnover was 4.17 million leva (about 3.14 million U.S. dollars) 