Anna-Maria Tamminen

+358 9 2288 4484
+358 40 550 0687
Tiina Ellisaari

Assistant's telephone:

+358 9 2288 4349


Anna-Maria specialises in commercial arbitration and litigation, with a special focus on complex international disputes. She currently represents parties in national and international arbitrations, related litigation as well as private enforcement cases.

Anna-Maria is trained in both common and civil law legal systems and is admitted to practice as an attorney both in Finland and the State of New York. Due to her training and work experience in Finland, Austria, United Kingdom, United States and Sweden, Anna-Maria has an in-depth understanding of both common and civil law legal systems.

Anna-Maria has experience in mediating, arbitrating and litigating high-stakes commercial disputes often consisting of multijurisdictional and parallel proceedings in the fields of general commercial law, international sales, post M&A, international investment law, competition law, telecoms and energy under the ICC Rules, SCC Rules, FAI Rules, Vienna Rules, LCIA Rules, DIA Rules, UNCITRAL and PCA Rules. Anna-Maria has additionally advised clients with regard to potential commercial and investment disputes and on the recognition, enforcement and setting aside of arbitral awards in a variety of jurisdictions.

Anna-Maria also acts as arbitrator in both international and domestic disputes. She regularly publishes articles, presents at conferences and lectures on dispute resolution topics.


  • 'Anna-Maria Tamminen stands out for being “very well versed in international disputes and arbitration.” Clients also appreciate her “quick response times” and ability to “listen to the client.” ', Dispute Resolution, Chambers Europe 2018

  • Ranked as one of the World’s leading Arbitration lawyers (Finland), Who’s Who Legal: Arbitration 2018

  • Ranked as a notable practitioner (Dispute Resolution), Chambers Europe 2018

  • Ranked as "a Rising Star" in Commercial Arbitration, Expert Guides, Legal Media Group 2018

  • One of the most highly ranked individuals in the non-partner category of Who’s Who Legal: Future Leaders – Arbitration and described as “persistent and experienced for her age, dedicated and bright”

  • Described by clients as "really capable and good in international cases" (Dispute Resolution) Chambers Europe 2016

  • Ranked as "a rising star" in the 2015 edition (Dispute Resolution) of Chambers Europe 2015

  • Ranked among the best lawyers in the 2014, 2015, 2016 and 2017 editions (Helsinki: Arbitration and Mediation, Litigation) of Best Lawyers®


  • Continues to represent a Finnish listed company in precedent-setting private enforcement cases where the total value in dispute is approximately EUR 200 million
  • Represented an international manufacturer against a Nordic company in a multibillion SEK dispute arbitrated in Stockholm under the SCC Rules and Swedish applicable law
  • Represented a Central European company against a Russian corporation in a multimillion dollar dispute arbitrated in Stockholm under the SCC Rules and Russian and Swedish applicable law
  • Represented a Finnish listed company against a Danish corporation in a high-value engineering dispute mediated and arbitrated in Copenhagen under the DIA Rules and Danish applicable law
  • Represented a Finnish company against a Russian company in relation to a multimillion euro joint venture shareholders’ dispute arbitrated in Finland under the FAI Rules and Finnish applicable law
  • Represented a major Finnish company in an ad hoc arbitration where Claimant sought the adjustment of allegedly unreasonable contractual provisions under Section 36 of the Contracts Act in connection with the termination of a long-term energy co-operation agreement
  • Represented a European telecommunications company in a long-running ICC arbitration with a French corporation arising out of a joint venture located in Eastern Europe, with several billion euros in dispute
  • Represented a European telecommunications company in long-running, parallel VIAC arbitrations relating to a shareholder agreement
  • Represented the SPLM/A (South Sudan) in its boundary dispute with the Government of Sudan in the so-called Abyei arbitration under the auspices of the PCA
  • Continuously advises Finnish and foreign parties in the drafting of contracts, especially with regard to dispute resolution provisions, as well as in the preparation of claims and settlement of disputes
  • Acted as sole arbitrator in an FAI arbitration between a Russian and a Singaporean party governed by Finnish law
  • Acted as sole arbitrator in an SCC arbitration between an Austrian and a Polish party governed by English and Swedish law
  • Acted as sole arbitrator in an SCC arbitration between a Swedish and a Cypriot party governed by Cyprus and Swedish law
  • Acted as sole arbitrator in an SCC arbitration between a Swedish and an Estonian party governed by Swedish law
  • Acted as sole arbitrator in an SCC arbitration between a Swiss and a Swedish party governed by Swedish law
  • Acted as co-arbitrator in an SCC arbitration between a Danish and an Estonian party governed by Danish and Swedish law


  • Skiljemannautbildningen (SAA and SCC training for arbitrators), 2016-2017

  • FAI Arbitration Academy, 2014


  • LL.M. in International Business Regulation, Litigation and Arbitration, New York University School of Law, USA 2011 (Fulbright Scholar)
  • Master of Laws, University of Turku, Finland 2006
  • Erasmus exchange year, University of Vienna, Austria 2004-2005


  • Partner, Hannes Snellman Attorneys Ltd, Helsinki and Stockholm 2018-
  • Managing Associate, Hannes Snellman Attorneys Ltd, Helsinki 2016-2017
  • Senior Associate, Hannes Snellman Attorneys Ltd, Helsinki, 2011-2015
  • Foreign Associate, Wilmer Cutler Pickering Hale and Dorr LLP, London, 2006-2010


  • Finnish Bar Association, member

  • New York State Bar, member


  • International Chamber of Commerce, Commission on Arbitration and ADR, member representing Finland (2014-)
  • ITA Board of Reporters, country reporter for Finland (2015-)
  • Journal of International Arbitration, member of the Editorial Board (2015-)
  • ASA below 40, international Co-Chair (2017-)
  • London Court of International Arbitration, Young International Arbitration Group, Co-Chair (2013-2017)
  • Young Arbitration Club Finland, past Chair (2012-2014) and Founding Member
  • Member of the Finnish Arbitration Association, Swedish Arbitration Association, LCIA European Users’ Council, ICC Young Arbitrators Forum, Young Austrian Arbitration Practitioners, Young Arbitrators Sweden


  •  Arbitration Agreement in Ehrström, Timonen, Turunen (Ed.) Arbitration in Finland, YACF publication (2017)
  • Issue Conflicts as Basis for Challenge of an Arbitrator – A new First in Nordic Arbitration Practice? Scandinavian Series of Law vol. 63 (2017), p. 331-354
  • Case comment “Finland: A Party Can Recover Costs of Court Proceedings for Interim Measures in a Subsequent Arbitration” in ICC Dispute Resolution Bulletin 2017 Issue 2
  • Kluwerarbitration blog “Arbitrator-ordered Costs of Injunctive Relief Proceedings in National Court: When Should a Party Be Able to Recover its Costs?” 6 April 2017
  • Several case comments for ITA Board of Reporters, Kluwer Arbitration (2014-)
  • The Obligation to Pay the Advance on Costs under the Vienna Rules and Austrian Law, Austrian Arbitration Yearbook 2009, Manz (2009) 


  • November 2017, ASA below 40 Fall Seminar, co-chair
  • September 2017, ASA below 40 seminar, co-chair
  • June 2017, DRI Seminar on Corporate Shareholder Disputes, Dublin
  • May 2017, YIAG Young Practitioners’ Symposium, Tylney Hall, co-Chair
  • April 2017, GAR Live Stockholm, speaker
  • April 2017, YIAG meets Vis, speaker
  • April 2017, Stockholm University, ICAL Programme, lecturer
  • March 2017, Young Practitioners Symposium co-presented by IBA Arb40 and YIAG, Milan, moderator
  • February 2017, University of Vienna, Winter Academy on Arbitration, lecturer