▁Exchange ▁also ▁cross - list ▁their ▁stock s ▁onto ▁the ▁Tr in idad ▁and ▁Tob ago ▁Stock ▁Exchange . ▁ ▁The ▁unique ▁four ▁symbol ▁al phan umeric ▁Market ▁Identifier ▁Code ▁( M IC ) ▁used ▁to ▁identify ▁the ▁T T SE ▁as ▁defined ▁under ▁ISO ▁ 1 0 3 8 3 . ▁of ▁the ▁International ▁Organisation ▁for ▁Standard ization ▁( ISO ) ▁is : ▁X TR N . ▁ ▁History ▁The ▁Sec ur ities ▁Market ▁which ▁inform ally ▁existed ▁in ▁Tr in idad ▁& ▁Tob ago ▁for ▁well ▁over ▁twenty ▁years ▁prior ▁to ▁the ▁opening ▁of ▁the ▁Tr in idad ▁& ▁Tob ago ▁Stock ▁Exchange ▁really ▁achieved ▁significance ▁in ▁the ▁early ▁ 1 9 7 0 s ▁when ▁the ▁Government ▁decided ▁as ▁a ▁matter ▁of ▁policy ▁to ▁local ise ▁the ▁foreign ▁owned ▁commercial ▁bank ing ▁and ▁manufact uring ▁se ctors ▁of ▁the ▁economy . ▁The ▁thrust ▁of ▁the ▁policy ▁was ▁to ▁get ▁such ▁companies ▁to ▁div est ▁and ▁sell ▁a ▁majority ▁of ▁their ▁shares ▁to ▁national s . ▁ ▁Two ▁bodies ▁chosen ▁to ▁effect ▁this ▁policy ▁were ▁the ▁Capital ▁Iss ues ▁Committee ▁which ▁was ▁set ▁up ▁by ▁the ▁Ministry ▁of ▁Fin ance ▁in ▁July ▁ 1 9 7 0 ▁to ▁direct ▁develop ments ▁in ▁the ▁primary ▁market ▁and ▁the ▁Call ▁Exchange ▁( an ▁association ▁of ▁share ▁deal ers ) ▁which ▁was ▁established ▁under ▁the ▁um bre lla ▁of ▁the ▁Central ▁Bank ▁in ▁August ▁ 1 9 6 5 ▁to ▁monitor ▁activities ▁in ▁the ▁secondary ▁market . ▁ ▁Par allel ▁to ▁this ▁development ▁in