The group said international pressure to stop trade in ramin, which is subject to trade restrictions under the Convention on International Trade in Endangered Species of Wild Fauna and Flora, had yielded success.
It said 500 companies which had accounted for about 95% of ramin use in Japan has stopped imports and use of the species by April this year.
Hutan believes Indonesian government efforts may also have made the species more difficult to sell.
It said cross border trade in ramin between Kalimantan, Indonesia and Sarawak had largely halted by April but smuggling continued between Sumatra and Peninsular Malaysia.
Hutan said illegal logging and trading of merbau and other species was still a problem.
