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We challenge ourselves to move to a new stage
by bringing the experience and strengths to sustain our present and future.
NPR-RIKEN Challenge
The automotive industry is
in the midst of a once-in-a-century
transformation
Carbon
Neutral
Shrinking engine
parts market
Industry
Restructuring
Structural change in
the automotive and
parts industry
Major
Environmental
Changes
Expansion into new
industrial areas
Expanding
Growth
Opportunities
Increase demand for
new functional
components
‘Innovation’ and ‘Challenge’,
and to the New Stage
Generate synergies
through
consolidation
Reform business
portfolio
Strengthen
sustainability
management
April 2026 ― Full Integration
Building on a rich history to reach even greater heights
NPR-RIKEN becomes an operating holding company
Whereas previously Riken Corporation and Nippon Piston Ring Co., Ltd. (NPR) were subsidiaries of NPR-RIKEN, in April 2026, corporate split procedures were implemented to transfer their sales, development, and corporate divisions to NPR-RIKEN. As a result, NPR-RIKEN became an “operating holding company.”
Since the business merger in October 2023, we have been advancing substantive integration through establishing divisions for overseeing the subsidiaries and subcommittee for integration. However, with this transfer of operations, full-scale integration are now implemented at the business line level as well.
What will this change?
Sales Framework
NPR-RIKEN handles direct sales to automotive and marine engine manufacturers, as well as other customers, who were previously served separately by Riken and NPR.
Development Framework
Intellectual property and related assets are managed by NPR-RIKEN, and R&D activities are centralized at NPR-RIKEN. Through this approach, we will build a more robust development framework.
Governance
The Corporate Divisions, which paying a leading rols as the second line of management governance are integrated into NPR-RIKEN. In this way, we aim to establish an effective and efficient governance structure that spans the entire group.
Six business units to drive operations
Business units are placed under NPR-RIKEN, and their respective operations, including those of manufacturing subsidiaries and other affiliated companies, will be led by the business unit directors.
What does that mean exactly?
・We organized our business divisions into groups based on compatibility in terms of customers, product characteristics, and manufacturing methods and will operate strategically and efficiently without regard to the boundaries of the former organizational structure.
・We delegate day-to-day decision-making to the business units and strive for agile management.
・We will conduct our business operations with a focus on asset efficiency, including ROIC.
For more details, please see
About NPR-RIKEN’s Six Business UnitsManufacturing divisions spun off as subsidiaries
The manufacturing divisions were spun off as subsidiaries and placed under the jurisdiction of the business units.
What will this change?
・Riken and NPR has changed their company names and was reborn as manufacturing subsidiaries of NPR-RIKEN, working to improve productivity and quality under the leadership of the business units.
Although the names “Riken Corporation” and “Nippon Piston Ring Co., Ltd.” will no longer exist, we will carry forward over a century of customer trust, experience, and expertise into the next era and aim for further growth on a new stage.
・We will further advance our efforts to strengthen our global optimal production structure, including our overseas subsidiaries.
Head office functions centralized in Tokyo
We revised our current structure, in which we maintain head offices in both Tokyo and Saitama City, and transition to a single-head office structure, based in Tokyo.
In FY2027, we plan to consolidate all headquarters functional departments and relocate the entire headquarters to the Tokyo Sankei Building in Otemachi, Chiyoda-ku, Tokyo.
What kind of benefits
will this provide?
From April 2026, we shifted from our current dual-head office structure, with offices in both Tokyo and Saitama City, to a structure where corporate and international operations are centralized in Tokyo. This move will enable faster decision-making and stronger communication, thereby supporting proactive expansion of our business.
In FY2027, we plan to relocate the domestic sales and administrative divisions remaining in Saitama City to the Tokyo Sankei Building in Otemachi, Chiyoda-ku, Tokyo.
Led by a project team, we are exploring ways to create a comfortable office that fosters creative ideas and delights our customers while taking our employees’ opinions into account.
New headquarters address from FY2027
Tokyo Sankei Building
1-7-2 Otemachi, Chiyoda, Tokyo
About NPR-RIKEN’s Six Business Units
Building on the technologies, expertise, and customer bases that Riken and NPR have cultivated over many years, the companies have reorganized their operations and established a new structure consisting of six business units.
By combining the history and strengths both companies have established over their respective histories, we will further enhance our business expertise while delegating decision-making authority and responsibility to each business unit, enabling agile and responsive operations!
Semiconductor & Electronics
Related Business Unit
We handle thermal engineering business, such as heater units required for semiconductor manufacturing, as well as EMC business, such as electromagnetic anechoic chambers, which are essential for improving the performance of IT and electronics products.
Piston Ring Business Unit
With one of the world’s largest market shares, NPR-RIKEN continues to strive for the ultimate piston ring!
Piping Components
Business Unit
Pipes are everywhere in our daily lives!
Piping supports our essential infrastructure, including water, gas, and air conditioning
Marine & Industrial
Components Business Unit
We also manufacture piston rings as large as an adult’s outstretched arms!
Compatible with a wide range of fuels, our piston rings contribute to achieving carbon neutrality.
Casting Components
Business Unit
We manufacture casting components mainly for camshafts, which are engine components.
Through advanced materials and design technologies, we achieve the perfect balance of lightness and strength!
Precision Components
Business Unit
We manufacture components that help enhance the performance of engines
We aim to become a leading global supplier for this niche market!
NPR-RIKEN in Numbers
Net sales
170.3
billion yen
Equity ratio
66.3%
ROE
6.1%
Establishment
2023
Riken Corporation: 1949
Nippon Piston Ring Co, Ltd.: 1934
Ratio of overseas
employees
46%
Ratio of female
managers (Consolidated)
8.1%
Composition of Net Sales by Region
Note: Sales are based on the location of the customer and classified into countries or regions according to geographic proximity.
Consolidated Ratio of
Employees by Region
Piston Ring Business
We provide high-performance, high-quality piston rings for passenger cars, heavy-duty commercial/industrial, aftermarket, and marine applications to a wide range of customers around the world in response to engine requirements for higher output, lower fuel consumption, and cleaner exhaust gas.
Precision Components and Casting Components Business
We provide high-quality products in a variety of fields, including precision machined parts for automotive and industrial machinery, and piping products for construction and industry..
Resin Products
・Resin Seal Rings
・Resin Gears
Precision Machined Components
・Turbo Changer Seal Rings
・Valve Lifters
・Aluminum Vanes
・Cylinder Liners
Sintered Components
・Valve Seat Inserts
・Powder Metal Assembled Camshafts
・Material to strengthen bearing
Cast Iron Components
・Suspension and Steering Components
・Cast Iron Camshafts
Piping Products
Semiconductor and Electronics-related Business
We are cultivating new businesses for the next generation by combining existing technologies and external resources in order to promote reformation of business portfolio.
