On December 15, 2011, the Bank of Thailand published the "Policy Guideline Permitting Foreign Banks to Establish a Subsidiary in Thailand". Henceforth, foreign banks that currently operate branch offices in Thailand may be converted into subsidiaries. Subsidiaries of foreign banks can have a maximum of 20 branches and 20 off-premise ATMs in the country.
 
Since only banks that already operate branches in Thailand may convert their branches into subsidiaries, the countries of origin of these banks (listed in the policy guideline) are identified as the affected trading partners.