- Machinery (manufacture and repair of machinery used at the Besshi Copper Mines)
- Coal mining (supply of coal used in copper smelting)
- Copper rolling works (processing of copper produced at the Besshi Copper Mines)
- Electric wire and cable works (separating the wire and cable business from the copper rolling works)
- Casting works (application of copper processing techniques to steel)
- Fertilizer plant (to prevent smoke pollution in the copper smelting process)
- Forestry (afforestation in the vicinity of the Besshi Copper Mines)
Meanwhile, finance and related business in Osaka developed into a banking business. Warehousing, originally part of the financial business, was split off. Thus, Sumitomo developed into a modern zaibatsu (financial combine) centering on industrial and financial businesses.