March, 2006 Established ATTO Co., Ltd. (Capital JPY8,000,000, at Shimura 1-chome, Itabashi-ku, Tokyo)
January, 2007 Moved to Funado 1-chome, Itabashi-ku, Tokyo
January, 2008 Converted to Stock Company
January, 2009 Increased capital to 10 million yen
December, 2009 Moved to Nihonbashihoncho, 4-chome, Chuo-ku, Tokyo
October, 2010 Established the Office in ChongQing
December, 2011 Moved Head office to Nihonbashikodenmacho, Chuo-ku, Tokyo
July, 2012 Renamed the Office in ChongQing ATTO(ChongQing)Co., Ltd. (Capital JPY8,000,000 - 100% subsidiary)
March, 2013 Increased capital to 50 million yen
June, 2015 Established the Office in ShangHai
April, 2016 Increased capital to 80 million yen
September, 2016 Moved Head office to Nihonbashihoncho, 2-chome, Chuo-ku, Tokyo
December, 2020 Moved Head office to Nihonbashimuromachi, 4-chome, Chuo-ku, Tokyo