Steve DeCosse is a Corporate/PE partner in the Tokyo office. His practice focuses on public and private cross-border M&A and strategic investments for trading houses, private equity firms, and corporations across a range of tech and other industries.

Steve is recommended as a leading corporate lawyer in Japan by all the independent guides to the legal profession, including Chambers, The Legal 500, Best Lawyers in Japan, and Asia Business Law Journal. Asia Business Law Journal named him on the A-List of Japan’s Top 100 Lawyers. Client comments include the following: “Stephen DeCosse has a high level of global experience and a proven track record and is capable of handling legal cases around the world” (The Legal 500 Asia Pacific, 2025) and “Steve is a great lawyer with commercial sense and quick responsiveness. He knows clients’ business and has ample experience of handling cross-border transactions” (Chambers Global and Asia-Pacific, 2024).

He is listed in the Hall of Fame for Japan: Corporate and M&A in The Legal 500 Asia Pacific, which lists “lawyers at the very top of the profession, widely known and respected by peers and clients for their longstanding involvement in market-leading work.” Steve has also been selected as a Stand-out Lawyer by Thomson Reuters.