PT Sona Topas Tourism Industry Tbk (SONA) engages in tourism business and operates duty-free shops. It was established in 1978, under the name PT Sona Tour, as travel agent. The company expanded its business by operating duty-free shop, due to growing demand from international tourists in early to mid 1990s. It went successfully and kept developing. Currently, the company has 2 subsidiaries that manage the operations of the duty-free stores in Bali, Jakarta, and Medan. It went IPO in July 1992.