Abe, Ikubo & Katayama

What Abe, Ikubo & Katayama does

Abe, Ikubo & Katayama (AIK) is an independent Japanese law firm founded in 1959 (originally as Ginza Law Office) and headquartered in GranTokyo South Tower, Marunouchi, Chiyoda-ku, Tokyo, with a second office in Fukuoka. The firm is structured as a partnership of lawyers and patent attorneys with no parent company, public listing, or disclosed institutional ownership. It employs more than 180 lawyers, patent attorneys, and administrative staff under one organizational umbrella — a structure that allows integrated delivery of legal counsel and IP prosecution/litigation services, which is comparatively uncommon among Japanese firms.

The firm provides full-service corporate legal counsel across approximately 20 practice areas, including general corporate, litigation and dispute resolution, restructuring and insolvency, intellectual property (prosecution, transactions, and litigation), life sciences and healthcare, M&A and corporate reorganization, international and cross-border transactions, compliance and internal investigations, finance, real estate and construction, antitrust and competition, consumer protection, labor, data privacy, IT/AI/Big Data, entertainment, startups, and energy/infrastructure. Its core, explicitly named strengths are litigation, restructuring, and intellectual property, including high-profile matters such as the corporate reorganization of Japan Airlines handled by Partner Eiji Katayama. The firm serves roughly 450 domestic corporate clients as retained counsel, spanning manufacturers, financial institutions, distribution and trading firms, construction and real estate companies, and service businesses, as well as overseas corporations with Japan-facing matters.

AIK generates revenue exclusively through professional legal service fees, with engagement-by-engagement pricing that is not publicly disclosed. The firm has no proprietary software product, no app or API surface, and no marketplace channel — distribution is entirely direct, via enterprise client engagement acquired primarily through thought leadership (partner-level publications, seminars, and speaking engagements at IPBA, AIPPI, and similar bodies), referrals from existing corporate clients, and sustained recognition across leading international legal directories including IAM Patent 1000, IP STARS, Benchmark Litigation, Best Lawyers Japan, Legal 500, and Chambers. Recent strategic activity has included a 2026 relocation of the Fukuoka office and a June 2026 reorganization of the Tokyo office that scaled the IP, litigation, restructuring, and M&A practice groups.

Name

Abe, Ikubo & Katayama

Legal name

Abe, Ikubo & Katayama

Website

https://aiklaw.co.jp

Company type

Private

Founded year

1959

Operating status

Operating

Headcount range

51–100 employees

Short description

Abe, Ikubo & Katayama is an independent Japanese law firm founded in 1959, providing full-service corporate legal counsel across litigation, intellectual property, M&A, restructuring, and compliance to approximately 450 domestic and international corporate clients from offices in Tokyo and Fukuoka.

Ownership category

akta.pro rank

Product category

Corporate Legal Services

NAICS

Offices of Lawyers (541110), Legal Services (5411)

SIC

Services-Legal Services (8111)

akta.pro primary industry

Bankruptcy, Restructuring & Insolvency Law (BPAHAAAH)

akta.pro secondary industries

Corporate Development & Strategic Partnerships Advisory (JVs, Alliances, Carve-outs) (BPAHAOAG), Fraud Risk Management & Anti-Bribery/Anti-Corruption (ABAC) (BPAHAFAL)

Keywords

• Corporate legal services
• Intellectual property law
• Litigation and dispute resolution
• Restructuring and insolvency
• M&A legal counsel

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Infrastructure

Revenue model

1. Legal Services Fees: The firm generates revenue through professional legal service fees charged to corporate clients for matters spanning litigation, dispute resolution, IP prosecution and litigation, M&A, restructuring, compliance, and general corporate legal affairs. Fee structures are likely hourly-based or fixed-fee arrangements typical of Japanese law firms.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Abe, Ikubo & Katayama is a full-service Japanese law firm providing legal counsel to domestic and international corporations across 20 practice areas, including general corporate, litigation, restructuring and insolvency, intellectual property (prosecution, litigation, and transactions), M&A, life sciences, international/cross-border transactions, compliance, finance, real estate, antitrust, labor, data privacy, IT/AI, entertainment, startup, and energy/infrastructure law. The firm combines lawyers and patent attorneys under one roof, serving approximately 450 retained corporate clients from offices in Tokyo and Fukuoka.

Product overview

Abe, Ikubo & Katayama (AIK) is a full-service Japanese law firm offering comprehensive legal services across virtually all areas of law. The firm provides integrated legal counsel through approximately 180 attorneys, patent attorneys, and staff members. The practice areas include General Corporate, Litigation & Dispute Resolution, Restructuring & Insolvency, Intellectual Property, Life Sciences, M&A, International Transactions, Compliance, Finance, Real Estate, Antitrust, Consumer Protection, Labor, Data Privacy, IT/AI, Entertainment, Startups, and Energy. The firm specializes particularly in intellectual property and restructuring/insolvency matters, with offices in Tokyo and Fukuoka serving domestic and international corporate clients.

Differentiator

Problem solved

Functional benefit

Products and services

• General Corporate / Corporate Legal Services Comprehensive corporate legal services covering governance, contracts, compliance, and ongoing business operations for corporate clients.
• Litigation and Dispute Resolution Civil and commercial dispute resolution services including litigation, arbitration, and alternative dispute resolution.
• Restructuring and Insolvency Corporate reorganization, bankruptcy proceedings, civil rehabilitation, and business turnaround legal services.
• Intellectual Property (IP) Comprehensive IP legal services including patents, trademarks, copyrights, trade secrets, and unfair competition matters, including IP litigation.
• Intellectual Property Prosecution Patent and trademark filing, prosecution, and registration services delivered through the firm's in-house patent attorneys.
• Life Sciences, Healthcare, Medical, and Pharmaceuticals Legal services for pharmaceutical, medical device, biotechnology, and healthcare industries including regulatory compliance.
• M&A, Corporate Reorganization and Alliances Legal counsel for mergers, acquisitions, divestitures, joint ventures, and corporate restructuring transactions.
• International / Cross-Border Transactions and International Arbitration Cross-border transactional matters, international arbitration, and foreign legal matters for corporate clients.
• Compliance, Internal Investigations and Crisis Management Corporate compliance systems, internal investigations, fraud examination, and crisis response services.
• Finance Financial regulation, banking law, securities, and financial transactions legal services.
• Real Estate and Construction Real estate transactions, development projects, construction contracts, and property dispute legal services.
• Antitrust and Competition Antitrust regulation, merger control, unfair trade practices, and competition law matters.
• Consumer Protection Consumer law, product liability, marketing regulation, and consumer dispute resolution.
• Labor and Employment Employment law, labor disputes, workplace compliance, and HR-related legal services.
• Personal Information and Data Privacy Data privacy compliance, personal information protection, and privacy regulation legal services.
• IT, AI and Big Data Technology law, AI regulation, data utilization, and IT-related legal services.
• Entertainment Entertainment industry legal services including media, sports, and cultural content.
• Startups Legal support for startup companies including funding, operations, and growth strategies.
• Energy and Infrastructure Energy regulation, infrastructure projects, and environmental compliance legal services.

Named customers4 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

Scale indicators3 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Mori Hamada & Matsumoto: One of Japan's leading full-service independent law firms with comparable litigation, M&A, restructuring, and IP practices. Comparable in scale, client base of large corporates, and international recognition, though typically considered slightly larger and more 'Big Law'-tier.
• Atsumi & Sakai: Independent Japanese law firm with comparable mid-tier positioning, strong finance, M&A, and cross-border practices. Closest peer in scale and structure outside the 'Big 5'.
• Nishimura & Asahi: Japan's largest independent law firm, offering full-service corporate counsel across litigation, M&A, restructuring, and IP. Larger scale but directly comparable in practice breadth and target client profile.
• TMI Associates: Large Japanese independent firm with particularly strong IP and technology law practices, combining lawyers and patent attorneys — a model closely parallel to AIK's integrated IP approach. Competes for IP-heavy and tech-sector mandates.
• Nagashima Ohno & Tsunematsu: Top-tier Japanese independent firm recognized for corporate, M&A, finance, and IP work. Comparable full-service offering and similar top-tier legal directory presence; typically considered one notch larger in cross-border mandates.
• Anderson Mori & Tomotsune: Major Japanese independent full-service firm with strong cross-border and corporate practices, including M&A, finance, IP, and dispute resolution. Directly competes for sophisticated corporate mandates from Japanese and international clients.

Broad incumbents

• Baker McKenzie (Tokyo): Global law firm with a large Tokyo office offering the full range of corporate legal services including IP, M&A, and restructuring. Competes for the same Japanese and international corporate clients but as part of a global platform with materially larger headcount.
• Ropes & Gray (Japan): International firm with a Tokyo office focused on M&A, finance, IP, and dispute resolution. Competes for sophisticated cross-border mandates involving Japanese corporates, particularly in private equity and life sciences.
• DLA Piper (Japan): Global firm with a substantial Tokyo office serving Japanese and inbound multinational clients. Comparable practice areas (corporate, IP, litigation) but operates as part of a global network with deeper cross-border coverage than AIK.
• Hogan Lovells (Japan): International firm with significant Tokyo presence across corporate, IP, and dispute resolution practices. Overlaps with AIK on IP and cross-border mandates; broader global platform but lacks the integrated patent-attorney model.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks4 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/abe-ikubo-katayama

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Funding overview

Funding rounds

Investors

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M&A

Investments

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

Frequently asked questions about Abe, Ikubo & Katayama