Matti Tyynysniemi

Managing Associate | Helsinki

Matti practises arbitration and litigation in the Dispute Resolution group. Matti has particular experience in construction, engineering, industrial and project delivery disputes.

In addition to negotiating settlements and advocating cases in front of arbitral tribunals and state courts, Matti is also regularly involved in dispute avoidance, such as in training clients or in drafting agreement templates that seek to prevent future disputes. Matti also has experience as an arbitrator.

To add to experience gained at Hannes Snellman, Matti draws from his previous career as a journalist in leading Finnish news organisations, where he specialised in politics and business.

Matti is currently on parental leave.


Hannes Snellman acted as counsel to NYAB Finland Oy in court proceedings to contest the termination of two construction contracts, relating to construction of a water treatment facility, where NYAB Finland Oy was the contractor and the City of Mikkeli was the employer. Mikkeli terminated the contracts mid-construction in March 2020. In December 2022, the Etelä-Savo District Court ruled that Mikkeli had no grounds for termination and awarded NYAB Finland Oy EUR 8.8 million (out of a claimed EUR 9.3 million) in damages, unpaid work, and costs, plus interest. Following the District Court ruling, the parties agreed on a settlement, whereby Mikkeli does not appeal and pays NYAB Finland Oy the sums awarded by the District Court plus interest up to a total of EUR 9.2 million.

Jan Lilius

Jan Lilius

Specialist Partner | Helsinki
Matti Tyynysniemi

Matti Tyynysniemi

Managing Associate | Helsinki
Juuso Lumilahti

Juuso Lumilahti

Associate | Helsinki

Represented several energy sector companies in a complex shareholder dispute.

Represented a Finnish energy company in an arbitration over a shareholder loan agreement.

Represented a Finnish construction company in damages litigation against a subcontractor.

Represented the client against a contractor in an arbitration over an industrial installation agreement.

Represented a contractor in a multi-million euro ICC arbitration over an EPC project delivery agreement in the energy sector.

Represented a Finnish construction company in an arbitration over a renovation project in central Helsinki.

Represented the customer in a dispute over the interpretation of an energy supply agreement.

Represented the buyer in landmark merger control proceedings.

Represented the client against contractors in a high-value dispute over a renovation project in central Helsinki.

Represented a large Finnish city in court proceedings over damages claims relating to water quality.

Represented consultants in two different arbitrations concerning power plant disputes.

Defended a multimillion arbitral award against a set aside claim in Finnish courts.

Represented the client against contractors in a dispute over the renovation of a water treatment facility.

Represented an international industrial company in an arbitration over the interpretation of a supply agreement.

Represented a Finnish construction company in litigation against a consultant over a major construction project.

Defended a board member of a foundation from damages claims made in Finnish courts against several individuals, co-ordinating the work of counsel representing the different respondents.

Represented the buyer in an arbitration over breaches of the seller’s warranties in the acquisition of a major Finnish company.


Education and Professional Background

  • Managing Associate, Hannes Snellman, 2022
  • Senior Associate, Hannes Snellman, 2019
  • Associate, Hannes Snellman, 2015
  • Master of Laws, University of Helsinki, 2015
  • Associate Trainee, Hannes Snellman, 2014 – 2015
  • Bachelor of Arts (journalism), University of Jyväskylä, 2013
  • Journalist, Helsingin Sanomat, 2011 & 2012 – 2014
  • Journalist, Yle Uutiset, 2007 – 2010 & 2011 – 2012

Read More About Matti

Blog Posts by Matti Tyynysniemi