Since 2012, we have been holding AIMO Open together with worldwide top mathematical institutions. For the last years, AIMO Open has been successfully concluded (2012 Hong Kong, 2013 Taiwan, 2014 Chengdu, China, 2015 Thailand, 2016 Hong Kong, 2017 Malaysia, 2018 Thailand, 2019 Taiwan). The number of students participating in AIMO Open keeps increasing.