1973AprilEstablished Sumisho Osaka Nonferrous Metal Sales Corporation with its capital of 30 million yen.
NovemberChanged the company name to Sumisho Nonferrous Sales Corporation. Opened Tokyo Branch Office.
1976MayMoved its head office to Tokyo, and changed the Osaka office to Osaka Branch Office (now Kansai Branch Office).
1977JanuaryOpened Nagoya Branch Office (now Chubu Branch Office).
1978FebruaryIncreased capital to 100 million yen.
DecemberOpened Fukuoka Branch Office (now Kyushu Sub-Branch Office).
1979OctoberOpened Sendai Sub-Branch Office (closed in September 2006).
1980AprilOpened Niigata Sub-Branch Office.
OctoberOpened Hiroshima Sub-Branch Office (now Chugoku Shikoku Branch Office).
DecemberIncreased capital to 200 million yen.
1988JanuaryChanged the company name to Sumisho Metalex Corporation.
1990FebruaryOpened Singapore Branch Office (closed in March 1999)
SeptemberOpened Hokkaido Sub-Branch Office (closed in March 2018)
DecemberIncreased capital to 600 million yen.
1992JulyOpened Kanto Distribution Center (closed in October, 2006)
OctoberMoved the head office to Kanda Ogawamachi, Chiyoda-ku, Tokyo
1998MarchIncreased capital to 829.8 million yen by allocatiing new shares to third parties.
2000FebruaryOffered company's equity publicly on OTC market, and increased capital to 1,169.8 million yen.
2002AprilEstablished a wholly-owned subsidiary, Sumisho Metalx (Shanghai)., Ltd., in China
(In April 2006, this company was closed and its businesses were transferred to Sumitomo Corporation (Shangahai) Ltd. and Sumitomo Corporation (Guanzhou) Ltd.)
AugustMoved Head Office to Kanda Surugadai, Chiyoda-ku, Tokyo
2003AugustObtained ISO9001 Certification (quality managemnt system)
2004JuneObtained ISO14001 Certification (Environmental managemnt system)
2005MarchBecame a wholly-owned subsidiary of the Sumitomo Corporation (delisted from the JASDAQ Stock Exchange on February 23, 2005)
MayMoved Head Office to Harumi, Chuo-ku, Tokyo
2017SeptemberMoved Head Office to Kandanishikicho, Chiyoda-ku, Tokyo
2018AprilBecame a wholly-owned subsidiary of the Sumitomo Corporation Global Metals Co.,Ltd