Ms. Shimada advises clients on various matters of competition law, including domestic and international cartels, bid-rigging, M&A transactions, investigations by the JFTC, leniency applications and general antitrust law compliance. She is especially active in cross-border transactions, such as international cartels. She has represented clients in connection with the investigation into an alleged cartel among forwarders regarding surcharges on air cargo, an international cartel in connection with marine hoses, an international cartel in connection with TFT- LCDs, an international cartel among airlines regarding rates and surcharges on cargo, an alleged international cartel in connection with bearings, and various merger control cases, including a vertical integration between semiconductor equipment manufacturers, the merger between Nippon Steel and Sumitomo Metal, and the opposition to BHP Billiton’s proposed takeover bid of Rio Tinto.

Ms. Shimada is also active in advising in international trade, government procurement, and export control. In addition, she advises on Unfair Competition Prevention Law, including trade secret related cases. She has been a member of the Subcommittee on Unfair Trade Policies and Measures of the Industrial Structure Council at the Ministry of Economy, Trade and Industry since 2013.

Recent activities


Chambers Asia-Pacific 2022: Top rankings for Nishimura & Asahi



Self - Preferencing and Online Platforms: A Universal Theme?



Merger Control Matter of the Year - Asia-Pacific, Middle East and Africa: GCR Awards 2021



Kennedy School of Government, Harvard University (M.P.A.)
Harvard Law School (LL.M.)
The University of Tokyo (LL.B.)

Professional experience

Hunton & Williams, Washington D.C.
1999 - 2004
Mitsui, Yasuda, Wani & Maeda

Major Cases


Mitsubishi HC Capital Inc. - Acquisition of CAI International, Inc.


Royal Holdings Co., Ltd. - Capital and business alliance with Sojitz Corporation


Acquisition of shares in, and consolidation of, Soushin Electronics Co., Ltd. (TSE: 6938) by Kamaya Electronics Co., Ltd., a subsidiary of Walsin Technology Corporation (TWSE: 2492), through a public tender offer in Japan.


Mitsubishi UFJ Lease & Finance Co., Ltd. - Business Integration through Merger with Hitachi Capital Corporation


Takeda Pharmaceutical Co., Ltd. - Sale of generics pharmaceutical business and plant


A strategic alliance with a leading telecommunications carrier by a leading financial group


Mitsubishi Materials Corporation: Investment in Vietnam’s Masan High-Tech Materials Corporation


Capital and business alliance with a listed leasing company by a leading general leasing company


A leading non-ferrous metal manufacturer making a joint venture its wholly-owned subsidiary


Capital and business alliance with a leading general leasing company by a leading telecommunications business group


Hitachi car navigation unit Clarion: Sale to France’s Faurecia S.E.


Japan Post Holdings Co., Ltd.: Acquisition of stake in Aflac Incorporated


Seiko Holdings Corporation's subsidiary's establishment of a JV with Development Bank of Japan Inc., divesting its semiconductor business by way of a corporate split


Dow Chemical - DuPont


GlaxoSmithKline - Novartis


Joint Venture (Establishment of Mitsui Chemicals & SKC Polyurethanes Inc.) by and between Mitsui Chemicals, Inc. and SKC Co., Ltd.


KDDI Corporation - Sumitomo Corporation

2013 - 2014

Business Integration between Sumikin Bussan and Nippon Steel Trading

2013 - 2014

Joint Purchase of ThyssenKrupp Steel USA LLC by Nippon Steel & Sumitomo Metal Corporation and ArcelorMittal


ASML - Cymer

2012 - 2015

Trade secret misappropriation litigation against the Korean steelmaker, POSCO

2012 - 2013

Investment in BlueScope Steel Limited by Nippon Steel & Sumitomo Metal Corporation

2011 - 2013

Merger between Nippon Steel and Sumitomo Metal

2011 -

International cartel investigation in connection with the bearing industry

2010 -

International cartel investigation in connection with various auto parts

2008 - 2009

Investigation in connection with water and dam gates

2008 - 2010

Opposition to the business integration of BHP Billiton and Rio Tinto

2007 -

International cartel investigation by forwarders in connection with surcharges on air cargo

2006 - 2010

International cartel investigation in connection with TFT-LCDs

2006 -

International cartel investigation into airlines in connection with rates and surcharges for cargo