The Bulgarian Stock Exchange blue-chip SOFIX index closed 2.27% higher at 445.43 points on Thursday, marking its sixth consecutive winning session, bourse data shows. Diversified groups Doverie United Holding and Chimimport gained most among blue chips, adding 10.11% and 6.48%, respectively. The wider BGBX40 index, which tracks the 40 most traded shares on the Sofia bourse, increased 1.55% to 93.55 points, while the BGTR30 index, in which companies with a free float of at least 10% have equal weight, added 1.85% to 456.37 points. The BGREIT index, which tracks real estate investment trusts, rose 1.49% to 129.06 points. Total regulated market trading turnover amounted to 2.2 million levs on Thursday.