June 28 (SeeNews) - The blue-chip SOFIX index of the Bulgarian Stock Exchange (BSE) rose slightly by 0.02% to 556.14 points on Monday, mostly backed by a 3.68% increase in the share price of Central Cooperative Bank (CCB) [BUL:CCB] and a 2.35% rise in the shares of IoT products developer Allterco [BUL:A4L], bourse data showed.