■ Career

1993.3	Graduated from Waseda University, Faculty of Law
1994.4	The Legal Training and Research Institute of the Supreme Court of Japan(48th Class)
1996.4	Registered with Daini Tokyo Bar Association
1996	Joined Hibiya Sogo Law Offices
2001.5	Graduated from New York University School of Law(LL.M.)
2001.7	Visiting Attorney at Weil, Gotshal & Manges LLP(New York)
2002.7	Registered as a New York State Attorney
2002.9	Returned to Hibiya Sogo Law Offices
2016 –	Visiting Professor at Graduate School of Law, Kobe University(Teaching "Antitrust Law Practice" in the Doctoral Program Advanced Legal Professional Training Program, "Top Lawyers Program(TLP)" )
2024 –	Managing Partner at Hibiya Sogo Law Offices
2025 –	Director at Fair Trade Institute

■ Publications

Toshiaki Tada et al., Competition Law Index (2025)

'Special Feature: Revised Subcontracting Law (Fair Transactions with Small and Medium-Sized Contractors Act) - Strengthening and Supplementing Regulations Against Undue Price Pressure' Jurist No. 1615 (October 2025)

"Examining Recent Enforcement Actions by the Japan Fair Trade Commission" Fair Trade No. 893 (March 2025)

"Communication and Negotiation Among Employees and Business Decision-Making: The Okumura Group Bid-Rigging Case" Jurist Special Edition No. 268 (August 2024)

'Antitrust and Subcontracting Laws in Response to Rising Costs and Wage Increases: Focusing on the Fair Trade Commission's Initiatives' Jurist No. 1600 (August 2024)

'Practical Procedures under the Antimonopoly Act' Edited by Masahiro Murakami, Kimitoshi Yabuki, Toshiaki Tada, Nobuaki Mukai (Chuo Keizai Sha, 2023)

"Antitrust Law Case Brief: Case Where Platform Algorithm Change Was Deemed Abuse of Superior Position [Tokyo District Court Judgment, June 16, 2022]" Jurist No. 1581 (March 2023)

"Evaluation and Challenges of the Freelancer Guidelines" Fair Trade No. 849 (July 2021 issue)

Systematic Issues: Antimonopoly Law (2nd Edition), edited by Tadashi Shiraishi and Toshiaki Tada (Daiichi Hoki, 2021)

Practical Guide to Antimonopoly Civil Litigation by Type, edited by Tetsuya Nagasawa and Toshiaki Tada (Yuhikaku, 2021)

"The 2019 Revision of the Antimonopoly Act and Its Impact on Corporate Risk Governance" Junkan Shoji Homu No. 2248 (Shoji Homu, December 5, 2020 issue)

"Client Privilege" Jurist No. 1550 (Yuhikaku, October 2020)

"Revision of the Leniency Program: Focusing on the Investigation with Cooperation Reduction System," Hōritsu Jihō No. 1148 (Nippon Hyoronsha, March 2020)

"Regulation of Labor and Service Transactions from an Economic Law Perspective," Journal of the Japan Labor Studies Association (2020)

"Framework for Evaluating Business Alliances: Focusing on Horizontal Business Alliances," Kōsei Torihiki No. 829 (November 2019 issue)

Frontiers of Antitrust Law: Practical Challenges Facing Japan, edited by Akinori Uesugi and Kaori Yamada (Shojihomu, 2019)

"Roundtable Discussion: The Intersection of Talent Acquisition Competition and Law" Jurist No. 1523 (Yuhikaku, September 2018 issue)

"Revised Distribution and Transaction Practices Guidelines and Points for Corporate Consideration" Fair Trade No. 803 (September 2017 issue)

"Challenges and Considerations in Commitment Procedures: From the Business Operator's Perspective" Fair Trade No. 798 (April 2017 issue)

"Operation and Challenges of the Penalty Reduction System" Legal Times No. 1107 (Nippon Hyoronsha, January 2017 issue)

From Monopoly Regulation and Fair Trade Commission Law & Fair Economy: The Economic Legal Order Supporting a Fair Economy, edited by Masayuki Funada and Kazuhiro Tsuchida, "Subcontracting Transactions and the Antimonopoly Act/Subcontract Act" (Nippon Hyoronsha, 2017)

"Future Antitrust Practice" Jurist No. 1500 (December 2016 issue)

"Roundtable Discussion: Evaluation and Future Challenges of the Act on Prevention of Delayed Payment of Subcontract Proceeds, etc." Fair Trade No. 789 (July 2016 issue)

Detailed Explanation of Antimonopoly Act Review Procedures, by Miki Sakakibara, Masayuki Shinoura, Toshiaki Tada, Tetsuya Nagasawa, Hiromitsu Miyakawa, Kimitoshi Yabuki (Kobundo, 2016)

"Issues in Unfair Trade Restrictions from a Practitioner's Perspective," edited by Japan Economic Law Association (Japan Economic Law Association Annual Report, 2016)

"Recent Developments Concerning International Cartels" Freedom and Justice (December 2015 issue)

"Non-Price Restrictive Practices: Price Maintenance Effects, Selective Distribution: Review of Distribution and Transaction Practices Guidelines (2)" Jurist No. 1486 (Yuhikaku, November 2015 issue)

"Examination of Cabinet Orders, Regulations, etc. under the Revised Antimonopoly Act and Practical Considerations" Fair Trade No. 772 (February 2015 issue)

"Corporate Legal Affairs: Antitrust Law Case Collection (Part 7) Exclusive Dealing" Jurist No. 1469 (Yuhikaku, July 2014 issue)

"Roundtable Discussion: The Cutting Edge of International Cartel Regulation" Jurist No. 1486 (Yuhikaku, January 2014 issue)

"Market Definition in Merger Control" Jurist No. 1451 (Yuhikaku, March 2013 issue)

"Enclosure Cases and Applicable Provisions" from Competition Law: Theory and Challenges = Competition Law: The Cutting Edge of Antitrust and Intellectual Property Law: A Tribute to Professor Negishi on His 70th Birthday, edited by Noboru Kawahama, Fumio Sensui, Kazuo Tosa, Katsuyuki Izumi, and Chizuru Ikeda (Yuhikaku, 2013)

"The Role of Law in Economic Society: A Festschrift for Professor Tadashi Ishikawa on His 70th Birthday," by Makoto Ito, Makoto Matsuo, Katsumi Yamamoto, Takehisa Nakagawa, Tadashi Shiraishi, and the Editorial Committee, "A Study on Horizontal Minority Share Acquisitions" (Shojihomu, 2013)

"Key Points for Preventing Violations of the Subcontract Act," Jurist No. 1442 (Yuhikaku, June 2012 issue)

"How to Report to the Fair Trade Commission When Confronted with Another Party's Violation," Business Law Journal February issue (Chuo Keizai Sha, 2012)

"Compliance Handbook for Sales Staff to Prevent 'Accidental' Antitrust Violations," Business Law Journal October issue (Chuo Keizai Sha, 2010)

"Roundtable Discussion: Private Monopolization and Unfair Trade Practices After the Introduction of Administrative Fines" Law & Technology: L & T No. 46 (Civil Law Research Association, January 2010)

"New Year Roundtable Discussion: The Future Vision of the Fair Trade Commission - Concrete Proposals for Becoming a Respected Entity" Fair Trade No. 723 (January 2011 issue)

'Systematic Issues: Antimonopoly Law' edited by Tadashi Shiraishi and Toshiaki Tada (Daiichi Hoki, 2014)

"Practical Selection of Fair Trade Commission Rulings and Precedents" edited by Fumio Izumi and Tetsuya Nagasawa, featuring "Customer Lock-in Strategies in Secondary Markets" Jurist Special Edition (Yuhikaku, 2014)

From International Enforcement of the Antimonopoly Act, edited by Kazuhiro Tsuchida, Part 2, Chapter 4: "International Cartels and Enforcement of Japan's Antimonopoly Act" (Nippon Hyoronsha, 2012)

"Various Amendments Concerning Penalty Payments for Unfair Trade Restrictions" Jurist No. 1385 (Yuhikaku, September 2009 issue)

"The Penalty Reduction System and Its Operation from the User Perspective" Fair Trade No. 696 (October 2008 issue)

"The Nature of Appeal Procedures under the Antimonopoly Act" Jurist No. 1342 (Yuhikaku, October 2007 issue)

"Corporate Compliance and the Antimonopoly Act" (Kazukiyo Onishi, ed.), "Current Status and Challenges of Antimonopoly Act Compliance Systems," "U.S. Antitrust Law and Compliance Programs," NBL Special Edition No. 115 (Shojihomu, November 2006)

"Operation of the Penalty Reduction System and Future Challenges," Law Plaza Vol. 58, No. 12 (Gyosei, December 2005 issue)

"Revisions Concerning Procedural Aspects of the Antimonopoly Act," Freedom and Justice (December 2005 issue)