Sten Olsson

+358 9 2288 4297
+358 50 499 0312
Elina Aulis

Assistant's telephone:

+358 9 2288 4311

Assistant's e-mail:


Sten Olsson is Head of the firm’s M&A Group. He is recognised as one of the leaders in mergers and acquisitions in Finland and has been involved in some of the most significant transactions in Finland and Sweden.

Dual-qualified as a Finnish and a New York attorney, Sten practiced for several years at international law firm Debevoise & Plimpton’s LLP’s New York and London offices and was admitted to the New York State Bar in 2001. Prior to that, he worked at Mannheimer Swartling’s private equity department in Stockholm. Sten has also worked with financial and legal matters at the European Investment Fund’s venture capital and buyout division in Luxembourg.

Sten serves on boards and consultative committees of various companies and non-profit organizations.


  • Leading individual, Commercial, corporate and M&A, Legal 500, 2019
  • "Clients describe him as an 'excellent M&A lawyer with vast experience and good commercial judgement.'" Corporate/M&A, Chambers Global 2019
  • "Sten Olsson is ‘a skilled negotiator’; ‘probably the best M&A lawyers in Finland’ according to one client", Commercial, corporate and M&A, Legal 500, 2018
  • "One client highlights that 'he makes clear and concrete recommendations which take commercial perspectives into account.'", Corporate and M&A, Chambers Global 2018 and Chambers Europe 2018
  • “Excellent senior lawyer with strong communication and technical skills and ability to develop trusting long-term relationships." IFLR1000 2018
  • Ranked as being among the world’s leading M&A and Governance lawyers, Who’s Who Legal: M&A and Governance 2019
  • Ranked as a Highly regarded lawyer in Capital Markets in the 2019 & 2020 editions of IFLR1000
  • Winner of the Client Choice Awards for Mergers & Acquisitions Finland, 2017
  • "According to clients, Sten Olsson 'has very good negotiation skills and is good with people.'", Corporate and M&A, Chambers Global 2017 and Chambers Europe 2017
  • Ranked as a Leading Individual, Corporate and M&A, in the 2014 - 2018 editions of Legal 500
  • Ranked as a Leading Lawyer in Capital Markets in the 2014, 2015, 2016, 2017 and 2018 editions of IFLR1000
  • Ranked among the best lawyers in Mergers and Acquisitions, Private Equity and Investment Funds in the 2014, 2015, 2016 and 2017 editions of Best Lawyers®
  • "Sten Olsson is well regarded for his work in industrial and private equity-related M&A. Clients offer strong praise: 'He is one of the few lawyers in Finland who combines commercial, pragmatic judgement with legal knowledge,' and 'He is skilful and experienced – his negotiation skills are such that a solution or compromise will always be found.'", Chambers Global
  • “Sten delivers legal advice that is exceptional and aligned with the commercial targets of his client; he manages to get the deal done”, ILO Client Choice 2017
  • “He is an expert within his field; a true business partner”, ILO Client Choice 2017
  • “Sten is an effective communicator; he is always clear and responsive”, ILO Client Choice 2017
  • “Sten has a business-oriented approach; he offers practical advice that exceeds the standard level of service”, ILO Client Choice 2017
  • "Department head Sten Olsson regularly advises leading private equity houses... One client comments: 'If you need a lawyer to drive the deal forward, go to Sten. He is well connected with lots of experience and is very commercial' ", Corporate/M&A, Chambers Global and Chambers Europe
  • "Sten Olsson is noted as having 'a good balance between being thorough and being fast, with the ability to support us in making commercial judgements.' " Corporate and M&A, Chambers Global and Chambers Europe
  •  “Market leader Hannes Snellman has nine dedicated M&A partners led by Sten Olsson. Its illustrious client base includes domestic and foreign private equity sponsors, multinational corporations, and Nordic private and public companies.” Legal 500
  •  “There is unanimous consent among peers that the 'large and experienced' M&A team, led by Sten Olsson, ranks among the very best in Finland.”, IFLR
  • “practice head Sten Olsson is well respected”, Chambers Europe
  • ‘Sten Olsson..., who comes highly praised by peers...’, Chambers Global
  • “Sten Olsson led teams on many of the firm’s top deals”, IFLR
  • ‘...a wealth of experience that is arguably ‘better than the rest’, particularly in the form of Mikko Heinonen, Sten Olsson and Johan Aalto.’, IFLR


  • Counsel to YIT in its agreement to establish a joint venture company for housing investments with Ålandsbanken
  • Counsel to Francisco Partners backed SmartBear in its acquisition of Bitbar Technologies
  • Counsel to Hartwall Capital in its acquisition of LeaseGreen

  • Counsel to Vaaka Partners in its acquisition of NHG

  • Counsel to DevCo in its acquisition of Medix Biochemica

  • Counsel to Vaaka Partners in its sale of Solita

  • Counsel to Terveystalo in its IPO and listing on the Nasdaq Helsinki stock exchange

  • Counsel to Vaaka Partners in its acquisition of Jungle Juice Bar

  • Counsel to Terveystalo in its acquisition of Diacor

  • Counsel to Hartwall Capital Oy Ab in its acquisition of SUEZ Suomi Oy

  • Counsel to DevCo in its acquisition of Vexve

  • Counsel to Triton in its acquisition of Fläkt Woods

  • Counsel to EQT in its acquisition of Touhula

  • Counsel to Intera in its acquisition of Wise Group

  • Counsel to Valmet plc in its EUR 340 million acquisition of the process automation business from Metso Corporation

  • Counsel to Trust Kapital in its acquisition of Enfo Zender

  • Counsel to Infratek in its acquisition of Pohjolan Werkonrakennus Oy

  • Counsel to Vaaka in its acquisition of Solita

  • Counsel to The Finnish State in the acquisition of Gazprom’s shares in Gasum

  • Counsel to Triton in its sale of Suomen Lähikauppa

  • Counsel to Humana AB in its acquisition of Arjessa Oy from Sentica Partners

  • Counsel to Vaaka in its sale of leading Nordic pet specialty retailer Musti ja Mirri Group

  • Counsel to Advent’s, Bain Capital’s and ATP’s in the acquisition of Nets

  • Counsel to Mondi Group in its contemplated acquisition of Walki’s extrusion coating plants in Finland and Poland

  • Counsel to EQT in its acquisition of Terveystalo from Bridgepoint
  • Counsel to Microsoft in its EUR 5.44 billion acquisition of Nokia's Devices and Services Business
  • Counsel to Advent in its acquisition of Mondo Minerals from HgCapital
  • Counsel to Triton in its acquisition of Suomen Lähikauppa from IK Invest
  • Counsel to Clayton, Dubilier & Rice, LLC in its acquisition of Ashland Water Technologies
  • Counsel to Vaaka Partners in the closing of its Buyout Fund II
  • Counsel to Ratos in its EUR 128 million sale of Medisize to Phillips Plastics Corporation
  • Counsel to Valedo in its acquisition of Corbel from Sentica
  • Counsel to UPM in its sale of its packaging business to Billerud
  • Counsel to Triton’s and KKR in the acquisition of Ambea / Mehiläinen
  • Counsel to UPM-Kymmene Corporation in its acquisition of Oy Metsä-Botnia Ab's Uruguayan operations and related transactions, with the aggregate value of approximately EUR 2 billion
  • Counsel to EQT in its EUR 195 million sale of VTI Technologies to Murata Manufacturing Co., Ltd


  • European Investment Fund, Luxembourg, 2004-2006
  • Debevoise & Plimpton, New York and London, 2001-2004
  • Mannheimer Swartling, Stockholm, 1999-2000
  • LLM, UC Berkeley and New York University, 2000 (Fulbright Scholarship)
  • Master of Laws, Helsinki University, 1999
  • Member of the New York Bar and Finnish Bar Association