• 1931

    In 1931 the company is founded in Thessaloniki.

  • 1950-1990

    The commercial activity of the company is expanded to all of Greece, having another Steel Service Center based in Athens, and leading the local market in steel.

  • 1991

    The first cut-to-length line is installed. The company launches its processing activity.

  • 1996

    SIDMA acquires HELSIDER S.A., the oldest Greek Steel Service Center, based in Aspropyrgos.

  • 1998

    SIDMA merges with KAL S.A., a company trading and processing flat steel products.

  • 1999

    SIDMA joins forces with SIDENOR S.A.

  • 2001

    SIDMA obtains control of the newly formed company PANELCO S.A., which engages in the production of polyurethane steel sandwich panels.

  • 2005

    The company is listed on the Athens Stock Exchange.

  • 2005

    Activity is expanded to Romania and Bulgaria.

  • 2007

    In 2007 the construction of 3 new Steel Service Centers , in Inofita, Bucharest and Sofia, is completed.

  • 2015

    SIDMA acquires its subsidiary PANELCO.

  • 2020

    Contribution of the Metallurgical sector of BITROS METALLURGICAL SA to SIDMA