Shigeki Tatsuno has a thorough knowledge in M&A, Joint Venture and cross-border transactions. In addition, he regularly advises a number of venture companies and PE funds, and engages in general corporate matters, including IP transactions, broadly.

Yasufumi Shiroyama is a partner who heads all aspects of the firm's intellectual property group practice, including: ・Drafting and arguing complaints, motions, answers and other pleadings for patent, trademark, copyright and know-how infringement litigation in district and appellate courts in Japan, on behalf of both Japanese and foreign companies; ・Drafting and arguing complaints, motions, answers and other pleadings for litigation arising in relation to technology transfer agreements, compensation for employee's invention, and allegedly defective products, etc. in district and appellate courts in Japan, on behalf of both Japanese and foreign companies; ・Drafting and negotiating various technology transfer agreements on behalf of both Japanese and foreign companies; ・Managing written discovery in cooperation with U.S. counsel for a Japanese client in patent license related litigation in U.S. federal court; ・Managing appellate litigation matters seeking nullification of decisions of the Japanese Patent Office; ・Drafting and arguing complaints, motions, answers and other pleadings in invalidation trial and opposition procedures before the Japanese Patent Office; and ・Advising on regulatory matters for pharmaceutical products, medical devices, chemical products, and personal data etc.

Fraud Investigation/Crisis Management With his background as a public prosecutor, an investigator at the Securities and Exchange Surveillance Commission (SESC) and a fraud investigator/forensic accountant at a Big 4 accounting firm, Hidetaka specializes on investigation of white collar crimes and fraudulent activities such as accounting fraud, market manipulation, insider trading, embezzlement, bribery and cybercrime and handles government inquiries of criminal and administrative authorities. Disclosure Regulations/ Accounting and Auditing With his experience in enforcing disclosure regulations in accounting frauds as an SESC investigator and addressing fraud risk in financial statements audit procedures at a Big 4 accounting firm, Hidetaka advises on disclosure regulations and accounting and auditing issues. Financial Regulations With his experience of being seconded to a foreign asset management and to a domestic major bank, investigation experience of foreign institutional investors' market manipulation and other fraudulent trade and foreign financial institutions' excessive entertainment for public pension fund, Hidetaka generally advises on financial regulations. Compliance Hidetaka generally advises on enhancement of compliance program to address bribery risk, antitrust risk and other compliance risk in response to foreign and domestic enforcements and on issues related to Japanese companies' management of their foreign subsidiaries.