Summit Investment Australia P/L (SIA) is involved in the investment and management of motor businesses across Australia. It also has interests in a fleet leasing company known as Summit Auto Lease Australia P/L (SALA).

SIA is a subsidiary of Sumitomo Corporation. SIA is owned 80% by Sumitomo Japan and 20% by Sumitomo Australia Ltd.

Sumitomo Corporation is a large Japanese multinational company with extensive motor industry experience.

Sumitomo Corporation not only conducts commodity transactions in all industries utilizing worldwide networks, but also provides related customers with various financing, serves as an organizer and a coordinator for various projects, and invests in businesses from the information industry to the retailing industry. Sumitomo Corporation thus shows great diversification as an Integrated Business Enterprise.

As at September 2004, Sumitomo had offices in over 90 countries and together with its consolidated subsidiaries and associated companies worldwide, it employed over 38,000 people.

Message from the President and CEO of Sumitomo Corporation


SIA employs in excess of 300 staff and operate across numerous locations around Australia. SIA have a lean staff structure. Head office is located in Rydalmere (Sydney).

The expertise and input provided by SIA to its businesses includes: -
  • Benchmarking and goal setting
  • Implementation and support of generic management policy based on proven business practices and precedent
  • Internal audits and problem identification
  • Trouble shooting and internal relief at a Management level
  • Implementation of quality systems to Australian and International standards
  • Monitoring and management of human resources and industrial relations issues
  • Monitoring overall industry trend and provide the latest marketing tools, assisting dealerships with advertising strategies and future business directions
  • I.T. support for Dealer Management System (DMS), PC's, network and all other I.T. areas.


SIA's hours of operation are 8.30am to 5.30pm Monday to Friday.

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