Issaku Yamaashi

Issaku Yamaashi


Kansas City

7500 College Boulevard, Suite 1400
Overland Park, KS 66210-4041

T: 913.253.2153

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Issaku Yamaashi, a partner in Foulston Siefkin’s Kansas City office, leads the firm’s northeast Kansas transactional practice group. He handles mergers and acquisitions, securities transactions, financing, business entity ownership issues, commercial real estate transactions, software licensing, and general business matters. Issaku’s M&A and securities practice has included representing clients in healthcare, real estate, service industries, manufacturing, transportation, and other businesses. Issaku has been selected by his peers for inclusion in The Best Lawyers in America® in the area of mergers and acquisitions law and identified by Chambers USA as a leading lawyer in the United States for Corporate/M&A. When he is not assisting clients, Issaku plays guitar with his experimental and improvisational band and is active in the regional music scene. Issaku loves spending time with his wife and three daughters. Issaku is fluent in Japanese.


  • University of Kansas (J.D., 2000)
    Notes and Comments Editor - University of Kansas Law Review
  • University of Chicago (BA in Economics, 1996)


  • Illinois (2000)
  • Kansas (2004)
  • Missouri (2016)
  • Texas (2022)
Community Involvement
  • InterUrban ArtHouse, Board President
Relevant Experience
  • Represented seller in a $90 million sale of a healthcare business.
  • Represented a real estate investment company in raising private equity and negotiating financing agreements in connection with a $250 million real estate transaction.
  • Represented issuers in over 100 private placements of securities in many industries, including healthcare, real estate, and banking, including a $56 million private offering for a real estate project.
  • Represented owner of a premier office park complex in negotiating commercial leases for over 2-million square feet of office space.
  • Represented a national hospitality company in acquisition and development of multiple sites.
Professional Memberships, Affiliations, and Honors
  • Selected by peers for inclusion in The Best Lawyers in America® in the area of Mergers and Acquisitions Law, 2021-2024
  • Identified by Chambers USA as a leading lawyer in the United States for Corporate/M&A, 2022-2023
  • University of Kansas Law School Diversity Advisory Council, Founding Member
  • Kansas Bar Association
  • Kansas City Metropolitan Bar Association Diversity, Equity, and Inclusion Collaborative, Firm Representative
  • Johnson County Bar Association
  • Journal of the Kansas Bar Association Member of the Board of Editors