• August 1909 Teijiro Inoue founded Sanseisha, pioneering Japan’s first corrugated board business.
    [April 12 of the same year—the day Teijiro Inoue decided to pursue independent enterprise—is celebrated as our founding anniversary.]
  • May 1920 Established Rengo Shiki K.K. in Tokyo, capitalized at ¥2 million
  • January 1926 Relocated head office from Tokyo to Osaka
  • December 1930 Opened processing plant at Yodogawa Plant (later Osaka Plant)
  • April 1936 Opened paper mill at Yodogawa Plant (later Yodogawa Plant), beginning integrated production system from containerboard to corrugated board
  • March 1937 Opened Tokyo Plant
  • February 1938 Relocated head office to the present Fukushima-ku, Osaka
  • May 1949 Listed on the First Section of the Osaka Securities Exchange (integrated into Tokyo Stock Exchange in July 2013)
  • April 1950 Listed on the First Section of the Tokyo Stock Exchange (moved to Prime Market in April 2022)
  • October 1961 Opened Tonegawa Mill (renamed Tonegawa Division in July 1997)
  • April 1962 Opened Tosu Plant
  • April 1970 Merged three subsidiaries including Rengo Transportation Co., Ltd. into one company, renamed Rengo Service Co., Ltd. (renamed Rengo Logistics Co., Ltd. in April 2004)
  • September 1971 Opened Shonan Plant
  • January 1972 Changed corporate name from Rengo Shiki K.K. to Rengo Co., Ltd.
  • September 1975 Opened Shin-Kyoto Plant (renamed Kyoto Plant in April 1992)
  • May 1980 Opened Oyama Plant
  • September 1985 Opened Chiba Plant
  • August 1990 Participated in a corrugated board joint venture in Malaysia, entering overseas business
  • October 1991 Merged Fukui Chemical Industry (present Fukui Division, Kanazu Mill and Takefu Plant)
  • April 1993 Relocated Osaka Plant and opened Sanda Plant
  • April 1994 Merged Niigata Corrugated Board Co., Ltd. and Asahikawa Rengo Co., Ltd. (present Niigata Plant and Asahikawa Plant)
  • June 1998 Made Howa Sangyo a subsidiary, entering flexible packaging business
  • April 1999 Merged Settsu (present Yashio Mill and Amagasaki Mill)
    Spun off Settsu's corrugated board division as Settsu Carton
  • July 2000 Made Marusan Paper Mfg. Co., Ltd. a subsidiary
  • August 2005 Relocated head office to the present Nakanoshima, Kita-ku, Osaka
  • April 2007 Introduced Executive Officer System
  • June 2007 Abolished the Executive Retirement Allowance System
  • October 2007 Renovated Katsushika Plant and integrated Kawasaki Plant
  • April 2008 Relocated and integrated Katsura Plant into Kyoto Plant, opening Shin-Kyoto Division as an integrated production plant of corrugated board/boxes and folding cartons
  • April 2009 Rengo's 100th anniversary
  • May 2009 Made Nihon Matai Co., Ltd. a subsidiary, entering heavy-duty packaging business
  • May 2010 Relocated Koriyama Plant and opened Fukushima-Yabuki Plant
  • April 2011 Changed corporate statement to "General Packaging Industry (GPI)"
  • April 2011 Established Rengo Packaging, Inc. in Hawaii, U.S.A.
    (opened the state's only corrugated board plant in May 2014)
  • May 2011 Made Sanyo Jidosha Unso Co., Ltd. a subsidiary
  • April 2012 Opened Shin-Sendai Plant as a symbol of reconstruction from the Great East Japan Earthquake
  • January 2013 Revised corporate philosophy
  • January 2014 Relocated Nagoya Plant and opened Shin-Nagoya Plant
  • October 2015 Acquired capital in Sun·Tox Co., Ltd.
    (made subsidiary in September 2020, integrated with the packaging solutions business of Mitsui Chemicals Tohcello, Inc. into a subsidiary in April 2024 and renamed RM TOHCELLO CO., LTD.)
  • October 2016 Made Tri-Wall Limited (Hong Kong, China), which operates a heavy-duty corrugated board business worldwide, a subsidiary
  • March 2017 Relocated Tokyo head office to the present Konan, Minato-ku, Tokyo
  • September 2018 Made Toppan Containers Co., Ltd. a subsidiary, renamed Rengo Toppan Containers Co., Ltd. (renamed RG Containers Co., Ltd. in March 2021)
  • April 2019 Rengo's 110th anniversary
  • April 2019 Separated Nagano Plant's Matsumoto Sub-Plant and opened Matsumoto Plant
  • August 2019 Tri-Wall made German heavy-duty packaging manufacturers TRICOR and Gutmann subsidiaries
  • December 2019 Established Nomination and Remuneration Committee as advisory bodies to the Board of Directors
  • June 2020 Introduced stock compensation plan for Directors and Executive Officers
  • August 2021 Opened Yodogawa Logistics Center on site of former Yodogawa Plant (closed in March 2018) and relocated Central Laboratory to the Center
  • September 2021 Made Taiko Paper Mfg., Ltd. a subsidiary, entering kraft pulp and kraft paper manufacturing and sales business
  • March 2022 Made six group companies including Takigawa Corporation Japan subsidiaries, significantly expanding flexible packaging manufacturing/sales bases and product lineup
  • May 2022 Established Rengo Europe in Germany to further strengthen European operations
  • June 2022 Through Rengo Europe and TRICOR, made German heavy-duty packaging materials manufacturer THIMM Packaging Systems a subsidiary, renamed TRICOR Packaging Systems
  • January 2024 Relocated Matsuyama Plant and opened Ehime Toon Plant