Ranked in 2 Practice Areas
1

Band 1

Tax: Bengoshi

Japan

9 Years Ranked

4

Band 4

Corporate/M&A: Domestic

Japan

12 Years Ranked

Ranked in Guides

About

Provided by Atsushi Oishi

Asia-Pacific

Practice Areas

M&A (M&A / Reorganizations / Capital and Business Alliances, Private Equity, Cross-Border M&A); Tax (Tax Investigations and Disputes, Tax Planning); Wealth Management; Dispute Resolution; Corporate Law (Corporate and Commercial Disputes)

Career

Background

The University of Tokyo (LL.B., 1996); New York University School of Law (LL.M., 2003); Weil, Gotshal & Manges, New York (2003-2004)

Major Activities

Member of Task Force on Management Buy Out and Other Transactions, organized by Ministry of Economy, Trade and Industry (2007); Member of Expert Committee on Anti-Tax Haven Legislation and Intangible Assets, organized by Ministry of Economy, Trade and Industry (2013); Invited Researcher at Global Family Business Research Institute, Waseda University (2016-); Member of PB Professional Ethics Review Committee, The Securities Analysts Association of Japan (2018-); Member of PB Education Committee, The Securities Analysts Association of Japan (2018-); Member of Study Group on Family Business Governance, Ministry of Economy, Trade and Industry (2025-)

Professional Memberships

admitted in Japan, 1998; New York, 2004; Japan-Licensed Tax Accountant (2006); Certified as Support Agencies for Business Innovation (2018)

Chambers Review

Provided by Chambers

Chambers Asia & Pacific

Tax: Bengoshi - Japan

1
Band 1
Individual Editorial
Atsushi Oishi is a highly respected taxation expert with a broad offering spanning transactional and regulatory work, including transfer pricing and audit matters, with additional expertise in tax disputes.

Corporate/M&A: Domestic - Japan

4
Band 4
Individual Editorial

Atsushi Oishi remains active on mergers and has experience in corporate restructuring. He also advises on cross-border financing mandates.

Contributions

Latest contributions provided by Atsushi Oishi

Global Practice Guide
Atsushi Oishi
Makoto Sakai
Authored by
Atsushi Oishi, Makoto Sakai
Article • Jul 2025

Strengths

Provided by Chambers

Discover other Lawyers at
Mori Hamada

Provided by Chambers
Filter by
Band

Japan

Banking & Finance: Domestic

1
Hiroki Aoyama
1
Band 1
1
Masanori Sato
1
Band 1
3
Takahiro Kobayashi
3
Band 3
4
Kei Shirakawa
4
Band 4
4
Yusuke Suehiro
4
Band 4
U
Yuki Matsuda
U
Up and Coming
Capital Markets: Domestic

1
Katsumasa Suzuki
1
Band 1
1
Toshimitsu Nemoto
1
Band 1
3
Katsuyuki Tainaka
3
Band 3
3
Taro Omoto
3
Band 3
Capital Markets: Domestic: J-REITs

2
Taro Omoto
2
Band 2
2
Yasuhiko Fujitsu
2
Band 2
Capital Markets: Domestic: Securitisation & Derivatives

1
Akira Ehira
1
Band 1
1
Masanori Sato
1
Band 1
Competition/Antitrust

1
Kenji Ito
1
Band 1
2
Hideki Utsunomiya
2
Band 2
3
Yusuke Takamiya
3
Band 3
Corporate/M&A: Domestic

1
Gaku Ishiwata
1
Band 1
1
Hajime Tanahashi
1
Band 1
4
Atsushi Oishi
4
Band 4
20 of 69 results