Mens smelteri- og smedjeforretningen begyndte i [[Kyoto]], så blev den i slutningen af 1600-tallet flyttet til [[Osaka]],<ref name="about"/> og Soga videregav kontrollen til sin søn Tomomochi, som gjorde den til et betydeligt handelshus<ref name="meet">[http://www.sumitomo.gr.jp/english/history/s_history/business_sp02.html Sumitomo in History, part I: A Business Spirit Alive and Well After 400 Years, A Meeting with Copper] {{Webarchive|url=https://web.archive.org/web/20130228185842/http://www.sumitomo.gr.jp/english/history/s_history/business_sp02.html |date=28. februar 2013 }} Sumitomo Official Site</ref> i [[Edo-perioden]].<ref name="brit"/> Sumitomo begyndte at eksportere kobber,<ref name="silk">[http://www.sumitomo.gr.jp/english/history/s_history/japan_co03.html Sumitomo in History, part II: Japanese Copper Across the Sea, Contributing to the Wealth of the Nation] {{Webarchive|url=https://web.archive.org/web/20120222052324/http://www.sumitomo.gr.jp/english/history/s_history/japan_co03.html |date=22. februar 2012 }} Sumitomo Official Site</ref> importere silke,<ref name="silk"/> tilbyde finansielle services,<ref>[http://www.sumitomo.gr.jp/english/history/s_history/japan_kitchen_02.html Sumitomo in History, part III: Japan's Kitchen, New Businesses Emerge] {{Webarchive|url=https://web.archive.org/web/20120222052328/http://www.sumitomo.gr.jp/english/history/s_history/japan_kitchen_02.html |date=22. februar 2012 }} Sumitomo Official Site</ref> og fra 1691 drift af kobberminer.<ref name="ab1">[http://www.sumitomocorp.co.jp/english/company/history/index.html About Us] Sumitomo Corporation Official Site</ref><ref>[http://www.sumitomo.gr.jp/english/history/s_history/milestones03.html  Sumitomo in History, part IV: Milestones, Major Copper Vein Discovered] {{Webarchive|url=https://web.archive.org/web/20120222052332/http://www.sumitomo.gr.jp/english/history/s_history/milestones03.html |date=22. februar 2012 }} Sumitomo Official Site</ref><ref>[http://www.sumitomo.gr.jp/english/history/s_history/adversity01.html Sumitomo in History, part VI: A Time of Adversity, The End of Rule by the Samurai] {{Webarchive|url=https://web.archive.org/web/20120222052353/http://www.sumitomo.gr.jp/english/history/s_history/adversity01.html |date=22. februar 2012 }} Sumitomo Official Site</ref>
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