| 1975-04 |
Founded in Sasebo City, Nagasaki Prefecture, with the purpose of managing and constructing pest control and anti-corrosion for buildings and the like. |
| 1978-09 |
Established in Sasebo City, Nagasaki Prefecture (original company name: San-yo Seido Co., Ltd.) |
| 1981-04 |
To strengthen the environmental hygiene division aimed at improving pest and rodent control and hygiene management, the corporate division was separated, and new Sasebo Environmental Hygiene Office, Nagasaki Environmental Hygiene Office, and Kumamoto Environmental Hygiene Office were established. |
| 1981-11 |
Head office moved to 2-1-1 Muko, Minami-ku, Fukuoka City. |
| 1982-07 |
Established a comprehensive training center (now Nakagawa Training Center) and research institute in Nakagawa Town, Chikushi District, Fukuoka Prefecture. |
| 1982-09 |
Established a Himeji branch office in Himeji City, Hyogo Prefecture, and expanded the general household division into the Kansai region. |
| 1986-05 |
In the general household division, established the Total Sanitation Division (TS Division) to establish an after-maintenance system. |
| 1987-03 |
Introduced a corporate identity and changed the company name to Sannix Co., Ltd. |
| 1987-08 |
In the HS Division, began a sales partnership with agricultural cooperatives. |
| 1991-03 |
Established the Makuoka factory in Makuoka City, Saga Prefecture, for manufacturing environmental hygiene equipment. |
| 1992-12 |
Established the Shinagawa Environmental Hygiene Office in Shinagawa Ward, Tokyo, and expanded the ES Division into the Kanto region. |
| 1993-12 |
Established a comprehensive training center in Genkai Town, Munakata District, Fukuoka Prefecture (at that time). |
| 1994-04 |
Established the Kitakyushu plant in Kokusa District, Kitakyushu City, for industrial waste treatment (operational from June of the same year), and set up the Industrial Waste Treatment Division to start intermediate processing of industrial waste. The Kitakyushu plant was transferred to Asahi Pretech Co., Ltd. (at that time) in November 2007. |
| 1995-12 |
Established Sannaim Co., Ltd. (now a consolidated subsidiary) with the primary business purpose of selling chemicals. |
| 1996-09 |
Registered shares with the Japan Securities Dealers Association. |
| 1997-08 |
Established the Nagoya branch and four other offices in Aichi Prefecture, expanding the HS Division into the Chukyo region. |
| 1997-09 |
Listed on the Second Section of the Tokyo Stock Exchange, the Second Section of the Osaka Stock Exchange, and the Fukuoka Stock Exchange. |
| 1999-02 |
Established Energy Comprehensive Development Research Institute Co., Ltd. with the primary purpose of selling waste-derived fuels and related products. |
| 1999-04 |
Established a plastic resource development plant in Okazaki City, Aichi Prefecture, to process and fuelize waste plastic, and renamed the Industrial Waste Processing Headquarters to Environmental Resource Development Headquarters to fully promote industrial waste recycling. |
| 1999-09 |
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| 2000-03 |
Established the Hibiki plant in Wakimatsu Ward, Kitakyushu City, for organic waste liquid treatment, and commenced operations. |
| 2000-04 |
Reorganized the HS Division into the HS Business Headquarters. Reorganized the ES Division into the ES Business Headquarters. |
| 2001-04 |
Moved the head office to 2-1-23 Higashi-Hakata, Hakata-ku, Fukuoka City (current headquarters). |
| 2001-04 |
Filed a notification as a specific-scale electricity provider (PPS) in anticipation of future power sales in line with the liberalization for specific demand customers. |
| 2001-10 |
Established Sannix Energy Co., Ltd. with the primary business purpose of generating and selling electricity using plastic fuel. |
| 2002-04 |
Established a Chiba branch and five other offices in the Kanto region, expanding the HS Division into the area. |
| 2003-04 |
Established Sannix Software Design Co., Ltd. with the primary purpose of contracting information system services. |
| 2003-10 |
Completion of the Sannix Energy Tomakomai Power Plant (Tomakomai City, Hokkaido). |
| 2004-05 |
Established Sannix Solution Co., Ltd. with the primary purpose of industrial waste treatment consulting and fuel additive sales. |
| 2006-08 |
Closed the Kanto region offices of the HS Division, except for the customer management department. |
| 2009-02 |
Registered as a member of the Japan Electric Power Exchange (JEPX) as a limited liability intermediate corporation. |
| 2009-10 |
Sannix Energy Co., Ltd. (now a consolidated subsidiary) acquired Hokuhai Co., Ltd. and C&R Co., Ltd. with the primary purpose of disposing of incineration ash emitted from the Tomakomai Power Plant. |
| 2010-04 |
Established Hokkaido Sannix Environment Co., Ltd. with the primary purpose of collecting, transporting, and intermediate processing of industrial waste. |
| 2010-06 |
Transferred the environmental resource development business, Tomakomai plastic resource development plant, and related operations to Hokkaido Sannix Environment Co., Ltd. through a simplified absorption split. |
| 2010-12 |
Established Zenichi (Shanghai) Energy Technology Co., Ltd. in Shanghai, China, with the primary purpose of manufacturing and selling solar cell modules. |
| 2012-01 |
Established Sannix Engineering Co., Ltd. with the primary purpose of planning, designing, selling, installing, and consulting on public and industrial solar power systems. |
| 2014-06 |
Transferred the sale and installation of solar power systems from Sannix Engineering Co., Ltd. to our company through a simplified absorption split to strengthen and expand the industrial solar power business. |
| 2014-08 |
Established the Makuoka Second Plant in Makuoka City, Saga Prefecture, for manufacturing solar power system related equipment. |
| 2015-10 |
Launched a new electricity retail business to expand the power retail sector. |
| 2015-11 |
Registered as a retail electricity provider in advance of the full liberalization of electricity retail in April 2016 for general household sales. |
| 2016-08 |
Established Zenichi (Jiaxing) Energy Technology Co., Ltd. (now a consolidated subsidiary) in Jiaxing, Zhejiang Province, China, with the primary purpose of producing solar cell modules and related accessories. |
| 2018-04 |
Absorbed Sannix Engineering Co., Ltd. to further streamline group management. |
| 2018-08 |
Changed the primary business purpose of Energy Comprehensive Development Research Institute Co., Ltd. to household electricity retail and renamed it Sannix Solar Power Electric Co., Ltd. (now a consolidated subsidiary). |
| 2019-06 |
Transitioned to a company with an audit committee. |
| 2022-04 |
Moved from the First Section of the Tokyo Stock Exchange to the Prime Market due to a review of market classification. |
| 2023-10 |
Changed from the Prime Market to the Standard Market on the Tokyo Stock Exchange due to a re-selection of market classification. |
| 2024-01 |
Established Sannix Engineering Co., Ltd. (now a consolidated subsidiary) through a simplified absorption split to transfer the PV business (corporate solar sales) to the company. |
| 2024-02 |
Established Sannix Home Build Service Co., Ltd. (now a consolidated subsidiary) through a simplified new-creation split to inherit and continue construction business requiring permits in the residential environment sector. |
| 2024-05 |
Established Sannix Resource Development Group Co., Ltd. (now a consolidated subsidiary) through a simplified absorption split to inherit the environmental resource development business. |
| 2024-05 |
Sannix Co., Ltd. was established in May 2024 as a 100% subsidiary of Sannix Holdings Co., Ltd. |
| 2024-05-17 |
Sannix Co., Ltd. (currently established as a 100% subsidiary of Sannix Holdings Co., Ltd.) |
| 2024-10 |
Established Sannix Co., Ltd. (now a consolidated subsidiary) through a simplified absorption split to inherit the residential environment business. |
| 2025-04 |
The simplified absorption split of Sannix Resource Development Group and Sannix Co., Ltd. became effective. Established Sannix Investment Co., Ltd. (now a consolidated subsidiary) through a simplified new-creation split for securities management and investment business, and changed the company name to Sannix Holdings Co., Ltd. |
