| Company name | Group | Parent | Subsidiary | Customer | Supplier | Alliance | Bank | Shareholder |
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| Geofact Corporation | ||||||||
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| 東松山工場 | ||||||||
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| High-Strength PRC Version Study Group |
Became a designated processing factory for steel segments, steel dams, etc., from Nippon Steel Corporation
Establishment of Kimitsu Works (now Kimitsu Business Office)
Founded Japan Press Concrete Co., Ltd.
Absorbed Japan Press Segment Co., Ltd.
Completion of dedicated line for Chiba factory segment
Completion of Fukuoka Factory
Completion of Kimitsu Business Office Yaita Factory
Opening of Tokyo Sales Office
Completion of Steel Plate Factory
Start delivery of the world's largest (at the time) segments for the Kan'ei-ji Tunnel construction on the Tohoku Shinkansen
Start delivery of the world's first
Establishment of the Box Bearing Horizontal Pull Method Association
Closure of the Chiba Factory (currently Chiba Prefecture Yokoshibahikari Town) due to reorganization of the Kanto Civil Engineering Production Base
Closure of the Tochigi Factory due to reorganization of the Kanto Civil Engineering Production Base
Integration of Tar Corporation and establishment of Geofact Corporation
Establishment of a sales company for RC segments in Singapore (GEOSTR – RV PTE. LTD.)
Establishment of GEOSTR RV (M) SDN.BHD., a manufacturing company for RC segments and a subsidiary of GEOSTR-RV PTE.LTD. in Malaysia
Geofact Inc. consolidates its subsidiaries Kansai Geostar Inc., Kyushu Geostar Inc., and Izumi Industry Inc.
Transferred all shares of its consolidated subsidiary Resco House Inc. to Hikiya Holdings Inc.
Transferred all shares of its consolidated subsidiary GEOSTR-RV PTE.LTD. to Robin Village International Pte. Ltd.
GEOSTR RV (M) SDN.BHD. is excluded from the scope of consolidation.
Due to a review of the market classification of the Tokyo Stock Exchange, it moved from the Second Section to the Standard Market.
Tokyo Econo Ken Tetsu Co., Ltd. was established (separated and became independent from Hachimitsu Sangyo Co., Ltd.) Capital: 20 million yen, Capital: 30 million yen.
GeoStar Inc. will exhibit at the "Advanced Construction, Disaster Prevention, and Disaster Reduction Technology Fair in Kumamoto 2026," held from November 18 to 19, 2026, at the Grand Messe Kumamoto. The booth will showcase precast concrete products and environmentally friendly development materials, welcoming visitors.
GeoStar Inc. has drafted the "GeoStar Group Customer Harassment Response Policy" and "Guidelines for Job Seekers (Our Rules for Job Hunting)" based on the revised regulations effective October 1, 2026, to protect employees and job seekers. These documents have been posted on the company website. The company commits to maintaining and improving a harassment-free, healthy workplace environment and to fostering a safe environment for employees and job seekers.
GeoStar Co., Ltd. will exhibit at the Construction Technology Exhibition 2026 Kinki as part of the Nippon Steel Group. We will introduce our precast concrete products and environmentally conscious development materials. The exhibition runs from October 28 to 29, 2026, at Intex Osaka Building 6, Room C.
GeoStar Co., Ltd. will exhibit at the Saitama Prefecture Construction Materials Prefecture Products Fair 2026, held from October 21-22, 2026, at Sonic City Exhibition Halls 1-5. At the booth, we will showcase our precast concrete products and environmentally conscious development materials, among other initiatives.
GeoStar Co., Ltd. will exhibit at the Construction Technology Expo 2026 Kanto, held from October 20-21, 2026, at Sunshine City Exhibition Hall B, C, and D. The booth will focus on showcasing precast concrete products.
GeoStar, in collaboration with Daisei Construction and Kitagawa Ironworks, developed manufacturing equipment that sprays and fixes CO₂ during concrete mixing using "T-Carbon Mixing." The equipment was introduced into the concrete production plant at Kanaya Factory, and from September 2026, verification began for the social implementation of precast products using CO₂‑fixed concrete. Introducing equipment that directly supplies gaseous CO₂ to a real concrete production plant for fixation is a first in Japan.
We would like to thank everyone who visited GeoStar’s booth at the 7th Hokkaido Construction and Development Exhibition. We introduced our products and technologies and had the opportunity to hear your feedback. We plan to exhibit next at the Construction Technology Exhibition 2026 Kanto, to be held October 20–21.
GeoStar Co., Ltd. will exhibit at the 7th Hokkaido Construction and Development Comprehensive Exhibition, held from October 7-8, 2026. The booth will showcase precast concrete products, and we look forward to welcoming visitors. The exhibition is held at Access Sapporo, and is organized by the Japan Management Association (JMA).
As part of a collaboration project with the CREATIVE LAND project, we produced and released a company introduction video for GeoStar. The video introduces what kind of company GeoStar is through the atmosphere of its employees. The company has been participating in the project as a sponsoring company since the 2024 fiscal year.
GeoSpace Co., Ltd. has released a company introduction video in collaboration with the CREATIVE LAND project. The video introduces concrete products made using the company's precast construction methods and its efforts to strengthen infrastructure resilience.