| 1988-10 |
Establishment |
| 1989-02 |
Based on the casting division that continued after the dissolution of Mitsui Aluminum Industry Co., Ltd., Mitsui Group's investment led to the establishment of Kyushu Mitsui Aluminum Industry Co., Ltd. |
| 1989-04 |
The company commenced operations. |
| 1989-07 |
The Foundry Group was spun off from the Material Business Division as the Foundry Business Division. |
| 1989-08 |
Started manufacturing and selling secondary alloys. |
| 1992 |
In 1992, current President Shunichi Maeda established T'sM's R&D to develop and manufacture motorcycle parts, marking the beginning of the current business. |
| 1997 |
In 1997, T'sM's R&D's business was integrated into Marumae, and the R&D division began full-scale business expansion. |
| 1997-09 |
Alumite Clean Room completed. |
| 2003 |
Starting with the operation of a new factory in 2003, the company focused on manufacturing large-scale products. |
| 2006 |
In 2006, the company was listed on the Tokyo Stock Exchange Mothers to strengthen its capital base, and actively expanded its business by establishing multiple bases and entering the solar cell field. |
| 2006-12 |
Ultra-high purity (5N) factory completed. |
| 2007-06 |
Foundry Chamber 'Foundry Factory No. 3' completed. |
| 2008 |
Following the management crisis caused by the Lehman Shock in 2008, the company significantly changed its business strategy, carefully selecting businesses based on profitability and efficiency, and returning to the founding principles of not relying on equipment or personnel expansion. |
| 2008-03 |
Refining Factory No. 2 completed. |
| 2011 |
In 2011, the company implemented Business Reorganization ADR, promoted the selection of businesses and review of fixed cost structures, and shifted from growth relying on equipment to a strategy leveraging technological strength. Resources were concentrated in the semiconductor field to build a resilient profit structure. |
| 2015-10 |
The Mitsui Group transferred all shares to K.M.J. Holdings 2 Inc., a wholly owned subsidiary of K.M.J. Holdings Inc., and changed the company name from Kyushu Mitsui Aluminum Industry Inc. to KM Aluminum Inc. |
| 2015-12 |
KM Aluminum Inc. absorbed and merged with K.M.J. Holdings 2 Inc. |
| 2020-12 |
Completion of the 'Castings No. 4 Factory' for casting chambers |
| 2022 |
In 2022, the company transitioned to the Tokyo Stock Exchange Prime Market, establishing a stable growth business foundation. |
| 2022-10 |
Introduction of a dedicated high-purity aluminum melting furnace |
| 2023-01 |
The company continues as the surviving company and merges with K.M.J. Holdings Inc. |
| 2025-04 |
In April 2025, the company transitioned to a group management system through the grouping of KMAC, its first since founding. |
| 2025-04 |
With the inclusion in the KMAC group, Marumae transitioned to a group management system for the first time since its founding |
| 2025-04 |
Following KMAC's entry into the group in April 2025, the scope of risk management expanded to cover the entire group. |
| 2025-07 |
The company formulated a new medium-term business plan 'Fusion2028' in July 2025 |
| 2026-01 |
KMX Inc. was absorbed and merged into Marumae Inc. in January 2026. |
| 2026-06 |
From June 2026, the company will begin full-scale group-wide enterprise risk management (ERM) coordination. |
