What Yamamoto Sangyo does

Yamamoto Sangyo (山本産業株式会社) is a privately held Japanese contract manufacturing company founded in 1947 (Showa 22) and headquartered in Wakayama Prefecture. The company provides end-to-end manufacturing outsourcing services for large consumer goods manufacturers, operating a documented six-stage production workflow: raw material receiving and shipping, formulation and ingredient mixing, material supply to production lines, filling and packaging, set/gift assembly for seasonal occasions (Mid-Year and Year-End), and industrial chemical filling. Its primary documented client is Kao Corporation (花王), for which Yamamoto Sangyo manages production line operations on-site at Kao's Wakayama factory complex via a dedicated Kao Office, in addition to operating its own headquarters/Kimidera Factory and the Iwade Factory (established January 2018). The company is classified as a medium-to-large Japanese corporation with 501–1,000 employees per firmographic data, and revenue is generated through long-term managed-services B2B contracts.

The business model is straightforward B2B contract manufacturing, with negotiated per-engagement pricing under multi-year enterprise relationships. Yamamoto Sangyo's go-to-market is relationship-driven, targeting large consumer goods manufacturers that require flexible outsourced production capacity for daily necessities such as shampoos, detergents, and household cleaning products. The company has no public listing, no disclosed funding rounds, no M&A activity, no patents, and no subsidiaries, operating as a closely-held family corporation — most recently transitioning leadership from Ohigashi Toshiki to Yamamoto Sumihisa as Representative Director and President on May 27, 2025.

The company's workforce strategy, branded as 'Colorful Workers' since 2019, deliberately aggregates non-traditional labor segments including students, parents, night-shift workers, W-work flexible staff, professional soccer players employed from partner club Artelivo Wakayama, and foreign technical intern trainees, supporting flexible staffing for seasonal volume peaks. Governance and compliance credentials include seven consecutive years of Health Management Excellence certification (2019–2026), Good Tax Filing Corporation recognition from the Wakayama Tax Office (2013), and Sedex membership (joined September 2022) for verified ethical, labor, and environmental practices across multinational supply chains.

Name

Yamamoto Sangyo

Legal name

山本産業株式会社

Website

https://yamamotosangyo.jp

Company type

Private

Founded year

1947

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Yamamoto Sangyo is a Japanese contract manufacturer founded in 1947 and headquartered in Wakayama Prefecture. It provides end-to-end manufacturing outsourcing services for major consumer goods companies, primarily Kao, spanning raw material handling, formulation, filling, packaging, and assembly across three Wakayama facilities.

Ownership category

akta.pro rank

Headquarters

HQ city

Wakayama

HQ country

Japan

HQ region

Asia

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Contract Manufacturing Services: Yamamoto Sangyo operates as a manufacturing outsourcing partner for a major detergent manufacturer. They handle原材料の受入れ (raw material receiving), 供給 (supply), 配合 (formulation/mixing), 充填包装 (filling and packaging), and 詰め合わせ作業 (assembly work) — the complete production workflow. Revenue is generated through service fees for manufacturing operations under long-term B2B contracts.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Yamamoto Sangyo is a contract manufacturer that operates outsourced production lines on behalf of major consumer goods manufacturers, most notably Kao. The company handles the full production workflow across six stages — raw material receiving and shipping, ingredient formulation and mixing, material supply to production lines, filling and packaging, gift-set assembly, and industrial chemical filling — operating from its headquarters and Kimidera Factory, Kao Office, and Iwade Factory in Wakayama Prefecture.

Product overview

Yamamoto Sangyo operates as a manufacturing outsourcing company (製造請負業) established in 1947, providing comprehensive contract manufacturing services for major detergent manufacturers. The company handles the complete production workflow including raw material acceptance, ingredient mixing, material supply, filling and packaging operations, product assembly, and chemical manufacturing. The service portfolio consists of six interconnected production process modules that work together to deliver shampoo, detergent, and other daily necessities, with the company operating multiple facilities including the Head Office/Kimidera Factory, Kao Office, and Iwade Factory in Wakayama Prefecture.

Differentiator

Problem solved

Functional benefit

Products and services

• Manufacturing Outsourcing Services (製造請負業) Comprehensive contract manufacturing services delivered for major consumer goods manufacturers (notably Kao), covering the complete production workflow including raw material acceptance and shipping, ingredient mixing, material supply to production lines, filling and packaging machinery operation, seasonal gift-set assembly, and industrial/commercial chemical filling. Services are delivered across three Wakayama Prefecture facilities: the headquarters and Kimidera Factory (本社・紀三井寺工場), the on-site Kao Office (花王事務所), and the Iwade Factory (岩出工場) established in 2018.

Quantifiable outcome

• Health Management Excellence法人認証 (Kenko Keiei Yuryo Hojin) — certified annually for 6+ consecutive years (2019–2026)
• +1 more outcomes

Named customers1 record

Segments2 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

Five partnerships are on record, tiered minor and core.

• Takamatsu Unit Fire Brigade (高松分団消防団)minorOthers · 1 September 2024Yamamoto Sangyo placed company advertisements on the Takamatsu Unit Fire Brigade vehicle in Wakayama City for the period September 2024 to March 2025. Fire brigade vehicles are used for disaster response, training, public fire prevention events, and local festivals.
• SedexminorOthers · 1 September 2022Yamamoto Sangyo joined Sedex (Supplier Ethical Data Exchange), a UK-founded non-profit organization facilitating sharing and verification of information on labor standards, health and safety, environment, and business practices. Sedex membership enables access to global CSR self-assessment questionnaires used by over 65,000 companies in 180 countries.
• Wakayama City / Wakayama Castle Hall Project (和歌山城ホール)minorOthers · 22 April 2021Yamamoto Sangyo made a donation toward the construction of the Wakayama Castle Hall (新市民会所), a new civic facility with a 954-seat main hall and 395-seat small hall, being built on the site of the former Fukido Middle School. The company received a commemorative certificate from Wakayama City.
• Meiji Yasuda Life Insurance (明治安田生命)minorGTM or Marketing Partner · 28 October 2016Through the '応援四文字プロジェクト' (Support Four-Character Project), Meiji Yasuda Life provided Yamamoto Sangyo with a commemorative plaque featuring the company-submitted phrase '万里一空' (Banri Ikkuu — perseverance and never losing sight of goals). The project connects local supporter companies with their local sports club.
• Artelivo Wakayama (アルテリーヴォ和歌山)coreStrategic or Co-development Partner · 13 April 2016Yamamoto Sangyo is an official partner of Artelivo Wakayama, a professional soccer club based in Wakayama City pursuing J-League membership. The company employs Artelivo players as workers ('Colorful Workers'), sponsors banners and flags at matches, hosts 'presents matches' (山本産業冠マッチ), and has employed players since 2016. The club won the 2016 and 2022 Kansai Soccer League championships.

Scale indicators2 records

Recent moves8 records

Expansion highlights5 records

Broad incumbents

• Rengo Co., Ltd. Corrugated packaging manufacturer supplying consumer goods supply chains. Operates in the broader packaging ecosystem with some overlap in B2B services for consumer goods manufacturers.
• Dai Nippon Printing Co., Ltd. Major Japanese printing and packaging conglomerate with consumer goods packaging operations. Provides overlapping packaging services with broader portfolio across multiple industries.
• Pasona Group Inc. Major Japanese staffing and HR services firm with manufacturing-focused workforce solutions. Comparable in addressing Japan's manufacturing labor market challenges, though through staffing rather than direct operational contract manufacturing.
• Toppan Holdings Inc. Large Japanese packaging and printing conglomerate serving consumer goods companies. Operates in overlapping packaging/filling services space, though at much larger scale and as part of a broader portfolio.
• Sanyo Chemical Industries, Ltd. Japanese specialty chemicals manufacturer with B2B industrial chemical contracts. Partial overlap in industrial chemical handling and formulation activities that Yamamoto Sangyo performs as a service module.

Direct peers

• NIPRO Corporation: Major Japanese medical device and pharmaceutical contract manufacturer with significant OEM/contract manufacturing operations. Comparable as a Japan-based B2B contract manufacturing services provider with long-term enterprise client relationships.
• Fuji Seal International, Inc. Japanese packaging and labeling company providing contract services to consumer goods companies globally, including filling and packaging operations. Directly comparable to Yamamoto Sangyo's filling/packaging service module for consumer goods manufacturers.

Emerging players

• World Intec Co., Ltd. Japan-focused manufacturing staffing and contract services company. Provides workforce to Japanese manufacturers, partially overlapping with Yamamoto Sangyo's labor-focused contract manufacturing model.
• Trust Tech Inc. Japanese manufacturing-focused staffing and engineering services company. Comparable in addressing manufacturing labor needs in Japan, though via staffing rather than direct facility operation.
• Will Group Inc. Japanese staffing and workforce solutions company with manufacturing segment exposure. Comparable in flexible workforce model for industrial clients, though at a different scale and scope.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance9 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Yamamoto Sangyo