| 1986 | The Hioki Philosophy is adopted of Respect for Humanity and Contribution to Society. |
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| 1988 | Employees hold a tree-planting festival at Hioki Forest Hills, the site of the current Head Office. |
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| 1989 | Forest Hills Scholarship Fund, a special public-interest trust, is launched. |
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| 1990 | The Head Office and main plant are relocated to a newly completed facility at Hioki Forest Hills in Ueda, Nagano Prefecture. |
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| 1991 | The Ueda Minami League youth baseball program is launched. |
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| 1992 | Hioki receives the Japan Greenery Research and Development Center President’s Award in recognition of its active promotion of afforestation. |
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| 1993 | Construction of the Hioki Lodge I is completed. |
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| 1995 | The first Local Afforestation event is held at Kamishina Elementary School. |
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| 1997 | - South Junior Sports Club is launched.
- Hioki earns ISO 14001 certification.
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| 1998 | Hioki receives the Kanto International Trade and Industry Bureau Director's Award in recognition of its active promotion of afforestation. |
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| 2000 | The first Hioki Festival is held. |
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| 2003 | Hioki begins donating musical instruments. |
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| 2004 | Hioki receives the 6th Shinshu Ecology Grand Prize in recognition of its Local Afforestation program. |
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| 2005 | - The Hioki Scholarship and Greening Foundation is established.
- Hioki receives the Minister of Economy, Trade and Industry Award in recognition of its active promotion of afforestation.
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| 2007 | Hioki begins supporting the Kenya Vegetation Restoration Project. |
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| 2008 | Hioki is recognized by the Minister of State for Measures for Declining Birthrate for distinguished service under the Supporting Children and Families in Japan program. |
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| 2009 | Hioki's main plant is recognized by the Prime Minister of Japan for distinguished service in promoting afforestation during 2009. |
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| 2011 | Hioki receives the 2011 Minister of Health, Labour and Welfare Encouragement Award in recognition of its safety and hygiene policies. |
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| 2012 | Hioki receives the Dark-blue Ribbon Medal in recognition of community service initiatives including its donation of musical instruments to an Ueda elementary school. |
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| 2013 | Construction of the Health & Fitness Center is completed. |
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| 2017 | Construction of the Hioki Lodge II is completed. |
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| 2020 | - Hioki is certified by Japan's Minister of Health, Labour and Welfare as “Platinum Kurumin” under the ministry's Kurumin program for its support of parenting.
- Hioki is certified by the Minister of Health, Labour and Welfare under the ministry's Eruboshi program for its gender equality initiatives.
- Hioki announces Vision 2030, its long-term management policy.
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| 2021 | - Hioki is chosen as a “Best Company” in the 2021 Best Place to Work® Japan Rankings.
- The Head Office Plant switches to CO2-free power.
- Hioki signs an Afforestation Support Agreement based on the Nagano prefectural government's Forest Foster Parent Promotion Project (Hioki Scholarship and Greening Foundation).
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| 2022 | - Hioki formulates its Basic Policy on Sustainability and its Sustainability Declaration.
- Hioki announces its support for the recommendations of the Task Force on Climate-related Financial Disclosures (TCFD).
- Hioki receives the Most Outstanding Business Supporting Future Generations Award (organized by the Alliance of Governors Supporting the Future) as part of the Commendations for Business Supporting Future Generations.
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| 2023 | - Hioki installs a solar carport with a generating capacity of 2 MW and a 2 MWh lithium-ion power storage system.
- Hioki begins using VCS- and CCB-certified carbon-neutral natural gas.
- Hioki purchases J-Credits derived from forestland in Nagano Prefecture.
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