Mori Hamada‘s practice advises companies and directors in both internal and independent investigations in both domestic and international contexts. The team advises on a wide range of issues, including unfair competition, bribery and corruption matters. Yasuhiko Fujitsu focuses on capital markets-related issues such as accounting fraud, insider trading, market manipulation and regulatory inspections. Hideaki Umetsu is highly experienced in cross-border crisis and risk management, particularly in investigations involving Japanese subsidiaries abroad, covering bribery, corruption, export and import controls and human rights violations matters therein. Takaaki Kanayama specialises in crisis management, corporate governance and dispute resolution, while Kazuhito Imaizumi is known for handling large-scale investigation and regulatory matters. Hiroshi Yamauchi is also a name to note.

Nagashima Ohno & Tsunematsu's offering is frequently involved in some of the most prominent regulatory investigations and white-collar crime matters concerning Japanese corporations and the domestic market. The team is led by Takayoshi Tao who specialises in financial and securities regulation, accounting fraud and conducting third-party investigations. Daisuke Fukamizu focuses on white-collar crime, regulatory compliance, antitrust issues and corporate crisis management. Ayumi Fukuhara is a trusted advisor for matters involving business and human rights, as well as building effective compliance frameworks in areas such as data protection, trade secrets, anti-corruption and broader regulatory compliance. Tomohiro Hen has represented clients in a variety of litigation matters involving accounting fraud, insider trading and the unauthorised disclosure of trade secrets. John Lane is also a key name, noted for his expertise in complex, multi-jurisdictional regulatory investigations and cross-border disputes.

Nishimura & Asahi’s team advises clients on regulatory investigations, including those from stock exchanges, government bodies, municipal offices and supervisory authorities. It also handles disclosure and media engagement-related cases. The practice is led by Hiroshi Kimeda who brings experience in handling major corporate scandal cases involving issues such as window-dressing, false financial reporting, insider trading, antitrust violations, defective products and misleading advertising. Kaku Hirao advises on matters involving executive and employee misconduct, as well as breaches of environmental regulations. Kei Umebayashi handles cases involving fraud, leaks of confidential information, and misrepresentations regarding product quality. Tomoyuki Numata is another key figure, with a particular focus on corporate crisis management and dealing with investigations by Japan’s Fair Trade Commission.

Anderson Mori & Tomotsune's team has noteworthy capabilities advising on investigations and crisis management, particularly in support of financial institutions. The team is led by Hidetaka Miyake who specialises in white-collar crime investigations and fraudulent activity, including accounting fraud, market manipulation, insider trading, embezzlement, bribery and cybercrime. Miyake also handles inquiries from both criminal and administrative authorities. Another key lawyer is Kazuhilo Kikawa who represents both domestic and international clients in administrative and criminal investigations by various enforcement bodies, as well as in complex commercial, regulatory and consumer-related disputes.

Atsumi & Sakai's practice advises on the entire lifecycle of corporate misconduct matters, from the initial handling of whistle blower reports to conducting investigations, implementing preventive measures and developing fraud prevention strategies. Teruhisa Toyama brings expertise in risk management, compliance, corporate law, securities litigation, disclosure policies, tax and funds matters. Hirofumi Hosoda frequently advises insurance companies and financial institutions, particularly on regulatory updates. Shingo Isobe focuses on risk management, general compliance, and white-collar crime matters, while Yusuke Miura has played a central role in investigations into corporate scandals, and has worked on recurrence prevention planning in cases involving international shipping cartels, investment fraud, the mis-selling of financial products by financial institutions and product quality fraud. The four helm the team.

Miura & Partners' practice collaborates closely with both domestic and international public prosecutors’ offices and regulatory bodies on crisis and risk management, as well as government and regulatory investigations. Ryoko Yamaguchi specialises in complex financial fraud investigations, harassment-related matters and tax issues. Takashi Kiuchi focuses on investigations and financial regulatory matters, and Masayuki Atsumi has significant experience in investigations involving antitrust, anti-bribery and other white-collar crime matters. Yuhei Sakao handles a broad range of domestic and cross-border investigations, including whistle blower claims, data manipulation, harassment, personal information leaks, cybersecurity issues and other forms of corporate misconduct. The four co-lead the team.

The team at TMI Associates, led by Osamu Ishihara, provides comprehensive support to companies dealing with compliance breaches and various types of corporate scandals. Ikuhiro Kikuta is well-versed in handling a wide array of complex white-collar crimes, including special breaches of trust, bid-rigging, obstruction of bidding processes, tax evasion, insider trading and market manipulation. Hisanori Morikawa is a key contact for matters involving bribery, collusion, public-sector bid-rigging, financial crime and election violations. Clients seeking advice on commercial litigation and pre-litigation strategy often turn to Keishiro Tashiro, while Hiroyuki Yoshioka is recognised for his expertise in cross-border investigations.

Ushijima & Partners' team advises on a broad range of corporate crisis matters, including internal investigations, policy and system improvements, regulatory communications, timely disclosures and media responses. The team is led by Shin Ushijima who brings extensive experience in litigation and arbitration involving international transactions, M&A, risk management, investigations and various regulatory issues. Co-leading is Hiroshi Watanabe who has deep expertise in risk management and investigations, particularly in cases involving accounting fraud, insider trading, bid-rigging, cartels, false advertising, environmental violations and employee misconduct.