September 26 (SeeNews) - Half of the four main Bulgarian Stock Exchange (BSE) indices closed in green territory on Monday, with the blue-chip SOFIX gaining a modest 0.44% to 591.74 points on the back of gains in energy and insurance group Eurohold Bulgaria [BUL:EUBG] and diversified group Doverie United Holding [BUL:DUH], bourse data showed.