Mikaela Myllynen

Senior Associate, Member of the Finnish Bar

Services

  1. Dispute Resolution
  2. International Construction & Projects

Contact details

I specialise in dispute resolution.

Before joining Castrén & Snellman’s Dispute Resolution service, I worked as a trainee at a law firm specialised in dispute resolution and after graduation as an associate at a boutique law firm specialised in dispute resolution, corporate law and energy law. My areas of practice include both domestic and international court and arbitration proceedings. I worked at Castrén & Snellman as a trainee already in 2017.

I have a Master of Laws degree from the University of Turku. I have also studied law at Lund University, Sweden.

Latest references

Oomi – Transfer of KSS Energia’s electricity sales contracts for consumer and business customers to Oomi
We are advising Oomi Oy in a business transaction whereby KSS Energia Oy’s consumer and business customers in the retail sale of electricity will be transferred to Oomi. The transfer is scheduled to take place in March 2025. The arrangement requires approval from the Finnish Competition and Consumer Authority. Oomi Oy is one of the largest energy service companies and electricity sellers in Finland. The arrangement is a result of the recent development of the electricity market and Oomi’s strategy, which aims to offer customers a seamless and improved digital customer experience.
Case published 20.12.2024
Global manufacturing company – Purchase agreement dispute
We represented a global manufacturing company in arbitration relating to a purchase agreement. The dispute was of a highly technical nature due to the qualities of the product, the intended use and the alleged defects. Also, several technical and quantum experts were involved from various jurisdictions. The value of the claims was approximately EUR 113 million. The dispute was settled in late spring 2022 under favourable terms to our client.
Case published 5.1.2022
Trety –  Dispute and settlement negotiations concerning a development and production agreement
We successfully represented Trety AB in a dispute and settlement negotiations concerning an agreement for development and production of communication devices for the healthcare sector. Eventually, the parties reached an amicable settlement to the full satisfaction of our client and thus the parties avoided an extensive arbitral proceeding. Trety AB is a global company that provides its customers with solutions for development, industrialization and production of electronics. Trety AB has over 30 years’ experience from IT, electronics and telecommunication industries.
Case published 11.2.2025
OP Corporate Bank, Nordea Bank and Skandinaviska Enskilda Banken – Financing arrangement for Vexve, a company owned by DevCo Partners
We advised a financier consortium including OP Corporate Bank plc, Nordea Bank Abp, and Skandinaviska Enskilda Banken AB in a leveraged financing arrangement for Vexve, a company owned by DevCo Partners Oy. The financing included EUR 143 million acquisition, refinancing and other facilities for, among other things, the financing of Vexve’s acquisition of Denmark-based Frese A/S, a leading manufacturer of dynamic balancing valves for hydronic networks. Vexve’s combined turnover after the completion of the transaction will be ca. EUR 200 million. Vexve is the leading European provider of valve solutions for the energy sector and selected energy-intensive industries.
Case published 7.2.2025
City of Pori and Pori Energia– Finance arrangement to fuel the future growth
Castrén & Snellman is acting as the legal advisor to the City of Pori and Pori Energia Oy in the finance arrangement whereby debt facilities in the total amount of EUR 292 million are secured for the purpose of refinancing the existing liabilities and fuelling the future growth of Pori Energia. Pori Energia and its financiers signed a Finnish law governed facilities agreement for this purpose on 13 January 2025. Pori Energia, a multi-utility company, operates in various sectors including district heating, electricity distribution, and electricity generation through CHP and renewable sources. The company also provides wind power services and industrial energy solutions in the Satakunta region where it has c. 60,000 customers.
Case published 6.2.2025
Sanok Rubber Company S.A. – Sale of a minority stake in Teknikum Group
We advised Sanok Rubber Company S.A. in connection with a transaction where the Polish International Development Fund 2 FIZ AN acquired 30% of the shares in Teknikum Group Ltd from Sanok Rubber Company S.A. Teknikum Group is a European polymer technology company serving industrial customers in need of reliable rubber, plastic, silicone, polyurethane, and foam solutions. The group has approximately 600 employees and operates four production plants in Finland and one in Hungary, and a sales office in Germany. Sanok Rubber Company S.A. is the European leader in the field of rubber products, rubber-to-metal articles and combination of rubber with other materials for the automotive, construction, agriculture, pharmacy and household appliances. Sanok Rubber Company S.A. is listed on the Warsaw Stock Exchange and employs more than 3,000 people in Europe and North America. Polish International Development Fund 2 FIZ AN is one of two specialised foreign expansion funds managed by PFR TFI. The fund’s aim is to co-finance foreign investments of Polish companies. We advised Sanok Rubber Company S.A. together with the Polish law firm Rymarz Zdort Maruta.
Case published 3.2.2025
City of Pori – Sale of 49% stake in Pori Energia to Polhem Infra
Castrén & Snellman is acting as the legal advisor to the City of Pori in its sale of a 49% stake in Pori Energia to Polhem Infra. Pori Energia, a multi-utility company, operates in various sectors including district heating, electricity distribution, and electricity generation through CHP and renewable sources. The company also provides wind power services and industrial energy solutions in the Satakunta region. This strategic partnership between the City of Pori and Polhem Infra aims to enhance Pori Energia’s financial stability and investment capabilities, enabling the company to further its efforts in the energy transition and continue delivering high-quality energy services to its customers. Polhem Infra, owned by Swedish state pension funds, focuses on investments in critical infrastructure, including renewable electricity generation, energy storage, energy distribution, digital infrastructure, and transport infrastructure. The transaction values Pori Energia at EUR 905 million. 
Case published 31.1.2025
Arctic Biomaterials – Patent litigation over bioactive biomaterials for orthopedic implants
We successfully represented Arctic Biomaterials Oy before the Finnish Market Court in an extensive dispute concerning alleged patent infringement and invalidity of the patent-in-suit. Our client has invented next-generation bioabsorbable composites that are engineered with Arctic Biomaterials’ X3 bioactive natural mineral fibers, offering robust, bioactive reinforcement for orthopedic implants. These advanced composites empower customers to create high-strength bioabsorbable solutions for the most demanding applications. Back in 2019, Purac Biochem B.V. alleged, among other things, that our client’s Evolvecomp product had infringed Purac Biochem B.V.’s European patent validated in Finland protecting a biocompatible composite and its use. Purac Biochem B.V. filed a preliminary injunction against our client under the Act on Securing the Provision of Evidence in Civil Cases Concerning Industrial Property Rights and Copyright (344/2000). The Finnish Market Court issued an ex-parte injunction against our client on 2 April 2019 (MAO:150/19) and a final injunction on 19 February 2020 (MAO:59/20). Our client had disputed Purac Biochem B.V.’s patent infringement claim from the beginning and claimed that the patent-in-suit was invalid. After five years of litigation, the Finnish Market Court handed down a ruling in the joined invalidity and infringement cases on 10 October 2024 (MAO:560/2024 and MAO:561/2024) declaring Purac Biochem B.V.’s patent invalid and dismissing Purac’s infringement action against Arctic Biomaterials. Also, the preliminary injunction based on an alleged patent infringement imposed against Arctic Biomaterials was cancelled. The Market Court declared Purac Biochem B.V.’s patent invalid due to a lack of inventive step. The Market Court applied the could-would method for determining whether the patent-in-suit is inventive or not. The could-would method is based on determining whether a person skilled in the art would (not simply could, but would) have made a specific improvement to prior solutions, based on the available prior art. The Market Court ruled that it would have been obvious to a person skilled in the art to solve the objective technical problem of the patent-in-suit in the manner presented in claim 1, using as a starting point the closest prior art (prior patent publication) and combining it with the teaching of another prior art publication. The decision is final.
Case published 29.1.2025

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