| Company name | Group | Parent | Subsidiary | Customer | Supplier | Alliance | Bank | Shareholder |
|---|---|---|---|---|---|---|---|---|
|
|
||||||||
| Keihin Optical Film Industry Co., Ltd. Hadano Office |
Keihin Kohmaku Co., Ltd. will be closed for summer holidays from Saturday, August 8 through Sunday, August 9, 2026. The closure also includes Wednesday, August 12 through Sunday, August 16, 2025, with company-wide equipment inspections on August 10–11. Normal operations resume Monday, August 17, 2025.
Our company will be closed for Golden Week from Saturday, May 2 through Wednesday, May 6, 2026. Normal operations resume Thursday, May 7. We apologize for any inconvenience and appreciate your understanding.
Keihin Kohmaku Co., Ltd. will be closed for the year-end and New Year holidays from Saturday, December 27, 2025 through Sunday, January 4, 2026. Normal operations resume Monday, January 5. We apologize for any inconvenience and appreciate your understanding.
Keihin Kohmaku Co., Ltd. obtained ISO 14001 and ISO 9001 certifications in September 2025. These certifications recognize the company’s efforts in environmental and quality management.
Keihin Kohmaku Co., Ltd. updated information on its website on August 21, 2025. The update also includes additional information about its equipment.
Keihin Kohmaku Co., Ltd. will be closed for summer holidays from Saturday, August 9 through Sunday, August 10, and from Wednesday, August 13 through Sunday, August 17, 2025. Normal operations resume Monday, August 18. We apologize for any inconvenience and appreciate your understanding.
Our company will be closed for Golden Week from Saturday, May 3, through Monday, May 5, 2025. Regular business resumes on Tuesday, May 6. We apologize for the inconvenience and appreciate your understanding.
Keihin Hikari Film Industries split off operations at its Hadano Plant and established a new company, Keihin Hikari Film. The new company took over the Hadano Plant and continues to manufacture and sell the products produced there.