Mikko Heinonen

+358 9 2288 4453
+358 40 527 8818
Laura Virkkala

Assistant's telephone:

+358 9 2288 4299

Assistant's e-mail:


Mikko's practice focuses on public and private M&A, equity issues and general securities regulation. He also provides advice regarding governance matters to corporations and their boards. In addition, Mikko has also advised many industrial and technology companies in their acquisitions, joint ventures, financing and licensing transactions. Mikko is entrusted with various non-executive board memberships and is acting as the secretary for boards of directors in various public and private companies.

Mikko is a frequent speaker in lectures at university courses and seminars and has published articles on corporate and securities law topics.

Mikko is a member of the Finnish Bar Association and also qualified to practice in the State of New York.



  • Ranked in Band 1 in Corporate/M&A in the 2019 edition of Chambers Global and Chambers Europe
  • Mikko is ranked as a Market leader in Capital Markets and M&A in the 2019 & 2020 editions of IFLR1000
  • "Clients enthuse that 'he is very analytical.' Another source adds that 'he is well connected and aware of developments in the local market.'", Corporate and M&A, Chambers Global 2018 and Chambers Europe 2018
  • "Managing Partner Mikko Heinonen 'is absolutely splendid; his approach to people and problems is impressive,' according to clients, who also describe him as 'client and solution-oriented.'", Corporate and M&A, Chambers Global 2017 and Chambers Europe 2017
  • Leading individual, Commercial, corporate and M&A, Legal 500, 2016, 2017, 2018 and 2019
  • "Mikko Heinonen is 'a top-notch, pragmatic but firm lawyer who is very nice to work with,' " Corporate and M&A, Chambers Global 2016 and Chambers Europe 2016
  • 'Clients describe managing partner Mikko Heinonen as "an excellent partner. He always keeps focused on our priorities." Other interviewees report: "We are so impressed with him. He is strategic and gives us real business advice. He is very helpful." ', Capital Markets, Chambers Europe 2015
  • Ranked among the leading lawyers (Corporate and M&A, Finland) in Legal 500, 2015
  • "... 'He is splendid – a top choice for leading transactions,' say clients. He has notable experience of public M&A mandates",  Corporate/M&A, Chambers Global 2015 and Chambers Europe 2015
  • Ranked as "Lawyer of the Year" in Venture Capital Law (Helsinki, 2015) by Best Lawyers®
  • "...Mikko Heinonen is an esteemed presence in the field, noted for his 'solution-oriented' approach to major transactions. A member of the New York Bar, he is a particularly popular choice on international matters.", Corporate/M&A, Chambers Global 2014
  • Ranked among the best lawyers in the 2012, 2013, 2014, 2015, 2016 and 2017 editions (Helsinki: Capital Markets, Corporate Governance & Compliance Practice, Corporate Law, Mergers and Acquisitions, Private Equity and Venture Capital) of Best Lawyers®
  • 'Mikko Heinonen is highly reputed amongst interviewees who describe him as hardworking and experienced', Corporate/M&A, Chambers Global 2013 and Chambers Europe 2013
  • "...‘good advice as well as the ability to manage a team while keeping to deadlines’.", Corporate and M&A, Legal 500, 2013
  • 'Peers describe him as "an excellent lawyer, with a very good approach to clients and work."', Capital Markets, Chambers Europe 2012
  • '...peers recommend Mikko Heinonen as "very knowledgeable in a large range of corporate matters."', Corporate/M&A, Chambers Global 2012
  • ’Mikko Heinonen is praised for his innovative and service-minded approach and reputed for having broad knowledge in public M&A and capital markets.’, Capital Markets and Corporate/M&A, Chambers Europe 2011
  • Ranked as a Highly regarded lawyer in Capital Markets and Corporate and M&A in the 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 and 2018 editions of IFLR1000
  • 'Mikko Heinonen is also praised by clients for his communication skills. "Mikko Heinonen is one lawyer that really stands out; I like him a lot, he is very client-orientated," says one.', IFLR1000, 2011
  • "I work with Mikko Heinonen and several other partners," says one client, "and it's always above all expectations." The client adds: "They focus on the client needs rather than just responding to questions...", '"Heinonen is easy to approach and very client-focused," says one client.', Banking, Mergers and acquisitions, IFLR 1000, 2010
  • 'Mikko Heinonen is “a highly visible and respected lawyer”...and is also described by peers as “an efficient lawyer for all corporate matters.”', Chambers Europe 2009
  • 'Mikko Heinonen is an “absolute star” regarded by one source as “one of the brightest people in the legal profession.” He “works incredibly hard for his clients” and is “highly reliable,” and clients say they “never have to worry about anything” when instructing him.', Chambers Europe 2008
  • ‘The “intelligent and reliable” Mikko Heinonen is active in a range of transactions and counts financing as a specialism.’, Corporate/M&A, Chambers Global 2008


  • Member of the Finnish Bar Association
  • Member of the New York Bar Association
  • Member of the International Bar Association


  • Partner, Hannes Snellman, 2003–
  • Managing Partner Helsinki, Hannes Snellman, 2011–2019
  • Head of Capital Markets, M&A or Public M&A, Hannes Snellman, 2005–2019
  • Associate, Hannes Snellman, 1997–2003
  • LL.M. Harvard Law School, 2002, New York Bar Exam, 2002
  • Master of Laws, University of Turku, 1997