St. St. Constantine and Helena Holding JSC. (BUL: 3NJ) acquired a 50% stake in TOURIMPEX -K.M. OOD on February 13, 2012. St. St. Constantine and Helena Holding JSC. (BUL: 3NJ) completed the acquisition of a 50% stake in TOURIMPEX -K.M. OOD on February 13, 2012.