| 1907-11 |
Our company was established as Iwaki Cement Co., Ltd. in Yokohama, and the following year, we built the Shikura Plant in Shikura Town, Iwaki City, Fukushima Prefecture, starting cement manufacturing business. |
| 1907-11 |
Our company was established in Yokohama as Iwaki Cement Co., Ltd. |
| 1908 |
The following year, we built the Shikura Plant in Shikura Town, Iwaki City, Fukushima Prefecture, and started cement manufacturing business. |
| 1908 |
Constructed Shikura Industrial Plant in Shikura Town, Iwaki City, Fukushima Prefecture, and started cement manufacturing business. |
| 1963-10 |
Changed the company name to Sumitomo Cement Co., Ltd. and joined the Sumitomo Group. |
| 1964 |
The following year, we joined the Shiraumi Association. |
| 1964 |
Joined the White Water Society. |
| 1994-10-01 |
Rebranding to Sumitomo Osaka Cement Co., Ltd. |
| 1994-10 |
Merged with Osaka Cement Co., Ltd. to establish Sumitomo Osaka Cement Co., Ltd., which continues to this day. |
| 1994-10-01 |
Merged and changed trade name to Sumitomo Osaka Cement Co., Ltd. |
| 1994-10 |
Merged with Osaka Cement Co., Ltd., and Sumitomo Osaka Cement Co., Ltd. was established. |
| 1996-03 |
Hikone Plant Closure |
| 1996-03 |
Closed Hikone Factory |
| 1997-04 |
Akaho Plant Private Power Generation Facility Completion |
| 1997-04 |
Completion of Akō Factory's private power generation equipment (output 100,000 kW) |
| 1998-05 |
Business alliance with Electrochemical Industry |
| 1998-05 |
Business alliance with Electrochemical Industry Co., Ltd. in cement business |
| 1999-07 |
Kochi Plant Private Power Generation Facility Completion |
| 1999-07 |
Completion of Kōchi Factory's private power generation equipment (output 61,000 kW) |
| 1999-11 |
Business alliance with Ube Mitsubishi Cement |
| 1999-11 |
Business alliance with Ube Mitsubishi Cement Co., Ltd. in cement logistics |
| 2000-03 |
Tamura Plant Closure |
| 2000-03 |
Closed Tamura Factory |
| 2002-11 |
Nano-Tera Technology Center Completion |
| 2002-11 |
Completion of new technology research institute "Nano-Tera Technology Center" |
| 2003-03 |
Ibuki Plant Cement Production Discontinuation |
| 2003-03 |
Ceased cement production at Ibuki Factory |
| 2005-04 |
Kochi Plant Power Wholesale Supply Generation Facility Completion |
| 2005-04 |
Completion of Kōchi Factory's power supply generation equipment (output 61,000 kW) |
| 2007-09 |
Investment in Kumano Steel KAKO Cement Building Materials |
| 2007-09 |
Invested in Yunnan Kun Steel Jiahua Cement and Building Materials in Yunnan Province, China |
| 2007-11-28 |
100th Anniversary |
| 2009-02 |
Completion of biomass power generation equipment at Tochigi Factory |
| 2009-02 |
Completion of Tochigi Factory's biomass power generation equipment (output 25,000 kW) |
| 2009-09 |
Completion of the third mining development project at Akki Mine |
| 2010-08 |
Start of cement recycling business at Ako Factory |
| 2010-08 |
Started cement recycling business for incineration ash and dust at Akō Factory |
| 2011-11 |
Establishment of a subsidiary for optical communication parts |
| 2011-11 |
Established manufacturing subsidiary for optical communication parts in Guangdong Province, China |
| 2012-07 |
Commencement of joint mining project at Hiraodai |
| 2012-07 |
Started joint mining project with Mitsubishi Materials Corporation at Hiraodai |
| 2014-09 |
Completion of raw material storage |
| 2015-09 |
Completion of Recycle Port at Hachinohe Port |
| 2015-09 |
Completed recycling port and fuel storage at Hachinohe Port |
| 2017-08 |
Announcement of strengthened business alliance with Denka Corporation |
| 2017-08 |
Announced strengthening of business alliance through logistics rationalization company establishment with Denka Co., Ltd. (Partnership ended in August 2025) |
| 2019-04 |
Completion of silo at Kochi Factory |
| 2019-04 |
Completion of large silo for cement storage at Kōchi Factory |
| 2020-12 |
Initiatives toward carbon neutrality by 2050 |
| 2020-12 |
Initiatives toward "2050 Carbon Neutrality" |
| 2022-05 |
Transfer of battery material business |
| 2022-05 |
Transferred battery materials business |
| 2023-05 |
Formulation of medium- to long-term vision 'SOC Vision 2035' |
| 2023-05 |
Formulation of the medium- to long-term vision "SOC Vision 2035" |
| 2026-03 |
Akao Power Plant at Ako Factory decommissioned |
| 2026-03 |
Abolition of Akō Power Plant Akō Power Station |
| 2026-04 |
Establishment of Cement Business Headquarters |
| 2050 |
Formulation of carbon neutrality vision 'SOCN2050' |
| 2050 |
Formulation of the "Carbon Neutral Vision" "SOCN2050" |
