Muto Seiko

What Muto Seiko does

Muto Seiko Co., Ltd. is a Japanese precision plastic injection molding manufacturer founded in 1956 and headquartered in Kakamigahara, Gifu Prefecture. The company operates an integrated one-stop production model spanning mold design and manufacturing, plastic injection molding, secondary processing (vapor deposition, printing, laser processing), and final assembly—all conducted in-house. With 400+ mold technicians producing approximately 130 molds per month, Muto Seiko serves major automotive manufacturers with a particular focus on HEV/EV components, alongside electronics and home-appliance customers producing cameras, printers, and electronic pens. The company is publicly listed on the Tokyo Stock Exchange Standard Market (TYO:7927) and employs 251-500 staff.

The company's revenue is generated through B2B contract manufacturing—selling precision plastic components directly to enterprise OEM customers via field sales, with pricing not publicly disclosed. Its customer roster includes Toyota Motor Vietnam, Denso Electronics, JVC Kenwood, Sony, Canon, and Yamaha. Repeated quality awards (Toyota Quality Excellence 2026, Denso Quality Award 2024, JVC Kenwood Best Partner 2025, Sony Excellent Partner for Environmental Activities 2025) reflect validated supplier status within Japanese OEM supply chains. Manufacturing is distributed across seven production bases: the Kakamigahara headquarters plus the newly completed Tech Forte Factory in Japan, two facilities in Vietnam (MVC since 1995 and MTH since 2006), one in Thailand (MTC), and one in Suzhou, China (MFC since 2003, certified as a Chinese High-Tech Enterprise).

Technology investments center on metal 3D additive manufacturing for mold cores/inserts, camera-based automated visual inspection systems, and production-line robotics enabling 24-hour unmanned operation. The January 2025 completion of the Tech Forte Factory—a new integrated production site purpose-built for HEV/EV automotive parts and projected to become the company's largest domestic facility—represents the most significant recent capital deployment. The company is also navigating a corporate governance remediation cycle: a Special Investigation Committee was established following accounting irregularities, accounting auditor was changed, corrected financial reports for prior fiscal years were submitted, and a consolidated subsidiary was placed into liquidation in March 2025.

Name

Muto Seiko

Legal name

ムトー精工株式会社 (Muto Seiko Co., Ltd.)

Website

https://muto.co.jp

Company type

Public

Founded year

1956

Operating status

Operating

Headcount range

251–500 employees

Short description

Muto Seiko Co., Ltd. is a Japanese precision plastic injection molding manufacturer founded in 1956, serving automotive (HEV/EV focus) and electronics OEMs via integrated mold-to-assembly production across seven facilities in Japan, Vietnam, Thailand, and China.

Ownership category

akta.pro rank

Product category

Plastic Injection Molding Manufacturing

NAICS

Plastics Product Manufacturing (3261), Motor Vehicle Parts Manufacturing (3363), Industrial Mold Manufacturing (333511)

SIC

Plastics Products, Nec (3089)

akta.pro primary industry

Automotive & Transportation Injection Molded Parts (IMANAFAB)

akta.pro secondary industries

Custom Injection Molding & Contract Manufacturing (Job Shops/CMs) (IMANAFAJ), Injection-Molded Plastics Manufacturing (IMANAOAG)

Keywords

• Plastic injection molding
• Precision mold manufacturing
• Automotive plastic components
• Integrated contract manufacturing
• Mold design services

Headquarters

HQ city

Gifu

HQ country

Japan

HQ region

Asia

Offices6 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Infrastructure, Technology or R&D, Supply Chain, Marketing or Sales

Revenue model

1. Plastic Component Manufacturing: Design, mold manufacturing, injection molding, secondary processing, and assembly of plastic components for automotive and home appliance industries.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Muto Seiko designs and manufactures precision molds and produces custom plastic injection-molded components, performing secondary processing (vapor deposition, printing, laser processing) and assembly entirely in-house. The company supplies these integrated plastic component solutions to major automotive parts manufacturers (including HEV/EV applications) and home appliance/electronics OEMs such as Sony, JVC Kenwood, Canon, Yamaha, Denso Electronics, and Toyota Vietnam. Production is carried out across seven manufacturing bases in Japan, Vietnam, Thailand, and China, supported by 400+ mold technicians with monthly output of approximately 130 molds.

Product overview

Muto Seiko is a precision plastic injection molding manufacturer offering integrated one-stop production from mold design/manufacturing through molding, secondary processing (vapor deposition, printing, laser processing), and assembly. The company operates with 400+ mold technicians producing approximately 130 molds monthly, serving automotive, camera, printer, and electronic device industries. Key technology capabilities include metal 3D printing for mold manufacturing, automated visual inspection systems, and production line automation enabling 24-hour operations. The product portfolio centers on three application areas: automotive components (including HEV/EV parts), camera components, and printer/electronic pen components.

Differentiator

Problem solved

Functional benefit

Products and services

• Mold Design and Manufacturing (金型設計・製作) Design and manufacturing of precision molds for plastic injection molding. Group-wide, 400+ mold technicians operate on a three-shift system producing approximately 130 molds per month across all domestic and overseas facilities.
• Plastic Molding and Secondary Processing (成形・二次加工) Plastic injection molding and secondary processing services including vapor deposition, printing, and laser processing for automotive and electronics manufacturers. Integrated with automated molding lines and camera-based image inspection for quality consistency.
• Inspection and Quality Assurance (検査・品質保証) Comprehensive quality control service with automated in-line inspection technology and inspection at each production stage to detect micro-defects and abnormalities early in the manufacturing process.
• 3D Additive Manufacturing for Molds (3D積層) Metal 3D printing service for mold manufacturing, including 3D-printed mold cores and inserts, leveraging expertise in material selection and property adjustment for optimal mold performance and cooling efficiency.
• Automation and Labor-Saving Production Lines (省人化・自動化) Production line automation and labor-saving solutions including automated part-extraction robots and camera-based image inspection, enabling 24-hour unmanned production with minimal staff. Customized line design based on customer requirements.
• Automotive Plastic Components (車載関連製品) Plastic components for automotive applications including HEV/EV parts, switches, and interior/exterior components. Produced at the new Tech Forte Factory dedicated to HEV/EV automotive parts manufacturing.
• Camera and Imaging Plastic Components (カメラ関連製品) Precision plastic components for camera and imaging equipment manufacturers, produced with integrated molding and secondary processing capabilities.
• Printer and Electronic Pen Plastic Components (プリンター・電子ペン関連製品) Plastic components for printers, electronic pens, and other electronic devices, leveraging precision molding and integrated secondary processing.

Quantifiable outcome

• Zero defects/zero incoming defects for Denso Electronics over multiple years
• +3 more outcomes

Named customers6 records

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability1 record

Feature4 records

Partnerships

Nine partnerships are on record, tiered core and minor.

• Sony (Hobutoku Ko-Electric Suzhou partnership)coreStrategic or Co-development Partner · 18 March 2025Sony-supported eco-challenge activities and water-based painting environmental improvement initiatives. MFC (Suzhou) received 'Excellent Partner for Environmental Activities' award. Also includes Synergistic Agriculture (協生農法) cultivation initiative.
• Daiichi Seiko Co., Ltd. (株式会社第一精工舎)coreStrategic or Co-development Partner · 23 May 2024Business partnership for Free Blend manufacturing technology. Combined expertise to expand capabilities and meet diverse customer needs.
• Toyota Vietnam (Toyoda Motor Vietnam)coreStrategic or Co-development PartnerAwarded 'Quality Excellence Award' in 2026 for achieving particularly excellent quality results among suppliers.
• JVC KenwoodcoreStrategic or Co-development PartnerStrategic partner; received 'Best Partner Award'. Technical training partnership with JVC Kenwood Nagoya facility for plastic mold technology.
• SonycoreStrategic or Co-development PartnerEnvironmental partnership through eco-challenge activities; support for MFC's environmental improvements including water-based painting.
• Gifu University (岐阜大学)coreStrategic or Co-development PartnerMuto Shozo Memorial Scholarship Fund (武藤昭三記念奨学基金) established 2016 as named program; supports students in advanced mold research at Regional Collaboration Smart Mold Technology Center; hosts annual research presentations.
• Gifu Prefecture International Takumi Academy (岐阜県立国際たくみアカデミー)coreStrategic or Co-development PartnerProvides lecturers for mold education program; part of Gifu Mold Industry Association initiative. Company employees teach mold design and molding courses to students.
• JEAN (一般社は法人JEAN)minorGTM or Marketing PartnerGold partner donor (500,000 JPY annually) to marine debris environmental conservation NGO working toward waste-free oceans.
• Gifu Hachimidori Fund (ぎふハチドリ基金)minorGTM or Marketing PartnerEstablished Muto Seiko 'First Step Support Fund' (はじめの一歩応援基金) within NPO fund to support local children facing difficulties.

Scale indicators5 records

Recent moves10 records

Expansion highlights6 records

Direct peers

• H-One Co., Ltd. Mid-cap Japanese manufacturer of plastic and sheet metal automotive parts, including injection-molded functional components. Comparable in customer mix (Japanese OEMs), product scope (plastic functional parts), and Asian manufacturing presence.
• Kojima Industries Corporation: Japanese auto parts maker (Toyota Tsusho group) producing plastic interior/exterior and functional components. Directly comparable product portfolio of molded plastic automotive parts for Japanese OEMs.
• Nifco: Japanese manufacturer of plastic fasteners and engineered plastic components, primarily serving global automotive OEMs. Closely comparable to Muto in automotive plastic injection molding focus, Tier 1 customer mix, and Asian manufacturing footprint.
• Marujun Co., Ltd. Mid-cap Japanese manufacturer of precision plastic and metal components, with injection molding capability serving automotive and electronics customers. Comparable in integrated molding and Japanese Tier customer base.
• Tokai Kogyo Co., Ltd. Japanese auto parts manufacturer specializing in plastic functional and interior components. Comparable in injection molding technology, automotive customer mix, and overseas (ASEAN) production footprint.
• Kasai Kogyo: Japanese producer of automotive interior and exterior plastic parts with injection molding capabilities. Comparable as a domestic Japanese supplier of molded plastic automotive components sold to major OEMs.
• Sango Co., Ltd. Japanese automotive parts manufacturer producing plastic and metal functional components including fuel and exhaust-related plastic parts. Comparable as a Japanese Tier 2 supplier with injection-molded automotive product offerings.
• Nishikawa Rubber Co., Ltd. Manufacturer of rubber and plastic sealing products for automotive applications. Comparable as a Japanese Tier 1/2 supplier serving major OEMs with molded polymer components across an Asian production network.

Broad incumbents

• Aisin Corporation: Major Japanese automotive parts conglomerate with diverse plastics and mechatronics capabilities serving global OEMs. Operates in the same broader automotive component ecosystem but at vastly larger scale and scope.
• Toyota Boshoku Corporation: Large Japanese Tier 1 automotive interior systems supplier with extensive plastic injection molding capabilities. Broader portfolio and larger scale than Muto, but operates in the same automotive plastic component category.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/muto-vietnam-co-ltd

Compliance8 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries4 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Muto Seiko