1948 March <Yachiyo Securities Co., Ltd., established>
1968 April <Yachiyo Securities obtained a securities license under the revised Securities and Exchange Law of Japan>
1981 October <Yachiyo Securities, Koa Securities Co., Ltd., and The Nomura Securities Investment Trust Sales Co., Ltd., merged to form KOKUSAI Securities Co., Ltd.>
1987 May <KOKUSAI Securities listed on the Second Section of the Tokyo, Osaka, and Nagoya stock exchanges>
1989 March <KOKUSAI Securities listed on the First Section of the Tokyo, Osaka, and Nagoya stock exchanges>
1994 October <Mitsubishi Diamond Securities Co., Ltd., established (renamed to Tokyo-Mitsubishi Securities Co., Ltd., in April 1996)>
1998 April <Merrill Lynch Japan Securities Co., Ltd. established as Merrill Lynch’s Japanese arm in the retail securities business>
December <KOKUSAI Securities registered as a securities company under the revised Securities and Exchange Law of Japan>
1999 July <Tokyo-Mitsubishi Securities took over and integrated all business operations of Mitsubishi TB Securities Co., Ltd.>
2000 April <Universal Securities Co., Ltd., Taiheiyo Securities Co., Ltd., Towa Securities Co., Ltd. and Dai-ichi Securities Co., Ltd., merged to form Tsubasa Securities Co., Ltd.>
2002 June <Tsubasa Securities and UFJ Capital Markets Securities Co., Ltd., merged to form UFJ Tsubasa Securities Co., Ltd.>
September <KOKUSAI Securities, Tokyo-Mitsubishi Securities, Tokyo-Mitsubishi Personal Securities Co., Ltd. and Issei Securities Co., Ltd., merged to form Mitsubishi Securities Co., Ltd., which simultaneously became a subsidiary of The Bank of Tokyo-Mitsubishi, Ltd., (currently MUFG Bank, Ltd.) and Mitsubishi Tokyo Financial Group, Inc. (currently Mitsubishi UFJ Financial Group, Inc.)>
2005 July <Mitsubishi Securities became a directly owned subsidiary of Mitsubishi Tokyo Financial Group>
October <Mitsubishi Securities and UFJ Tsubasa Securities merged to form Mitsubishi UFJ Securities Co., Ltd>
2006 May <Mitsubishi UFJ Merrill Lynch PB Securities Co., Ltd., a wealth management joint venture in Japan with Mitsubishi UFJ Financial Group, Inc., launched business>
2007 September <Mitsubishi UFJ Securities became a wholly owned subsidiary of Mitsubishi UFJ Financial Group (As a result, Mitsubishi UFJ Securities stocks were delisted.)>
2009 December Mitsubishi UFJ Securities Spin-off Preparation Co., Ltd. established as a subsidiary of Mitsubishi UFJ Securities
2010 February Mitsubishi UFJ Securities Spin-off Preparation registered Type I and Type II Financial Instruments Businesses and Investment Management Business
April Mitsubishi UFJ Securities Spin-off Preparation succeeded the financial instruments business of Mitsubishi UFJ Securities (currently Mitsubishi UFJ Securities Holdings Co., Ltd.) and renamed to Mitsubishi UFJ Securities Co., Ltd.
May Mitsubishi UFJ Securities and the investment banking operations of Morgan Stanley Japan Securities (currently Morgan Stanley MUFG Securities Co., Ltd.) integrated to form Mitsubishi UFJ Morgan Stanley Securities
2014 March Mitsubishi UFJ Morgan Stanley PB Securities became a subsidiary of Mitsubishi UFJ Morgan Stanley Securities
2019 October Mitsubishi UFJ Morgan Stanley Securities acquired all shares of Mitsubishi UFJ Morgan Stanley PB Securities Co., Ltd., held by MUFG Bank, Ltd. to make it a wholly owned subsidiary
2020 August Mitsubishi UFJ Morgan Stanley Securities merged with and absorbed Mitsubishi UFJ Morgan Stanley PB Securities Co., Ltd.