Outi Tähtinen

Partner, Member of the Finnish Bar

Services

  1. Employment
  2. Dispute Resolution

Contact details

I head our Employment service together with Tomi Kemppainen.

I am an experienced and practical employment law professional. I advise employers in all kinds of issues related to employment law. I have developed a deep understanding of employment contract issues, employment relationship change situations, mergers and acquisitions and negotiations over my more than 20-year career.

I spend a considerable part of my working time on employment law disputes, and I am very competent in negotiations related to dispute situations. I also regularly advise clients in employment offence matters and various internal investigations in the workplace.

I spare no time and effort to achieve the best result for my clients. I seek to provide clients practical and understandable counselling and find solutions within the required schedule. Based on the feedback I have received, I have succeeded well in this.

I am an experienced and well-liked trainer and I regularly lecture on different aspects of employment law.

The work of an attorney is demanding and variable, and I enjoy it. The best thank you for my work is a pleased client. A good working environment and nice colleagues with a sense of humour are also important to me.

For several years, Chambers Europe, Client Choice and the Legal 500 have ranked me among leading legal experts in the field.

Latest references

Finnish forest industry company – Decision to waive prosecution for an occupational safety and health offence
We assisted a Finnish forest industry company as well as its management and supervisors in a criminal investigation concerning an occupational safety and health offence. Based on the arguments we presented in the final statement, the prosecutor decided not to prosecute the CEO and two employees of the company and waived the corporate fine claim against the company. 
Case published 17.4.2024
Gasum and C&S – A Shared Course to a Cleaner Future
Over the past seven years, Gasum has transformed itself from a traditional Finnish gas distributor to a modern energy company and significant circular economy operator in the Nordic countries. Castrén & Snellman has stood by Gasum’s side throughout this journey.  When General Counsel Tiia Ryhänen joined Gasum in 2013, the company was still a traditional gas distributor. ‘We closed our first liquefied natural gas (LNG) acquisition in 2014. In the seven years since, Gasum has transformed itself into a modern, international energy company and circular economy operator’, Ryhänen said. This major shift has taken place through a series of corporate transactions. Ryhänen has been involved in every one of them over the past seven years. ‘It has been exciting to be a part of creating something new and expanding the company. I have particularly enjoyed welcoming many new people onto the Gasum team.’ ‘Like an Extension of Our In-House Team’ Castrén & Snellman Attorneys has been Gasum’s partner from the very start. ‘C&S has stood by our side throughout this journey. We have a strong partnership. C&S really understands how we handle acquisitions. We always want to act in a way that respects the people on the other side of the table’, Ryhänen said. Ryhänen’s team includes three other in-house lawyers. Since last August, the team has also had one of Castrén & Snellman’s lawyers ‘on loan’, i.e. on secondment. ‘C&S is like an extension of our in-house team. We work with at least one of their lawyers nearly every week. We regularly talk about the best ways to move forward in assignments. We can trust them to always deliver on their promises.’ Towards a Carbon-Neutral Society Gasum is a Nordic gas sector and energy market expert. The company’s strategy is to expand the natural gas market. Our work has a shared purpose: cleaner energy. ‘The demand for natural gas and biogas is growing fast, because fighting climate change requires switching to cleaner solutions. We are building a bridge towards a carbon-neutral society together with our customers and partners.’ In practice, this goal means that Gasum will have to expand its network of gas filling stations, increase its production and sourcing of biogas and help its customers reduce their emissions. ‘We have also expanded our operations on the electricity market. Last September, we entered into a long-term wind power deal with ABO Wind Oy for the output of their wind park. In 2023, we will begin selling our customers renewable wind power produced in Kestilä.’ Gasum’s Journey to a Modern Circular Economy Operator with C&S 2020 Gasum acquires the entire share capital in Swedish biogas producer Skövde Biogas AB from Torran Gas Holding AB. 2019 Gasum acquires AGA’s Clean Energy business and Nauticor’s Marine Bunkering business from Linde AG. Gasum sells its subsidiary Gasum Tekniikka Oy to industrial maintenance partner Viafin Service Oyj. 2018 Gasum increases its shareholding in Skangas to 100%. Gasum acquires Enegia Group Oy’s energy market services business. 2017 Gasum increases its shareholding in Skangas to 70%. Gasum sells its heat business and natural gas retail business to Auris Kaasunjakelu Oy in the Auris gas distribution network area. Gasum acquires 100% of the shares in the Swedish biogas producer Swedish Biogas International. The acquisition makes Gasum the leading producer of biogas in the Nordic countries. 2016 Gasum acquires the Biotehdas biogas plant chain owned by Taaleritehdas Biofactory I Ky Private Equity Fund. Gasum and its subsidiary Skangas acquire the Risavika LNG production plant in Norway from Lyse Group. Gasum acquires the full shareholding of Biovakka Oy. 2015 Gasum sells the shares in its subsidiaries Gasum Paikallisjakelu Oy and Helsingin Kaupunkikaasu Oy to SL Capital Partners. 2014 Gasum acquires a majority in Skangass’s liquefied natural gas (LNG) distribution operations from Lyse Corporation. The acquisition makes Gasum the leading Nordic LNG operator.
Case published 15.1.2021
Gasum – Acquisition of Enegia’s Energy Market Services
We assisted Gasum Oy in its acquisition of Enegia Group Oy’s energy market services business. The deal includes the entire share capital of Enegia Consulting Oy, Enegia Portfolio Services Oy and intStream Oy. The deal is pending on authority approvals and is expected to be completed in the early autumn of 2018. Enegia is one of the leading Nordic independent energy expert organisations for the energy industry. Over half of the 100 largest Finnish companies use Enegia’s services, and Enegia Group’s net sales in 2017 were €119.7 million. Enegia’s electricity trade volume is 15 TWh, corresponding to approximately one fifth of Finland’s electricity use. The energy market services business employs approximately 35 professionals. Gasum is an energy company and Nordic gas sector expert. Together with its partners, Gasum is building a bridge towards a carbon-neutral society on land and at sea. Gasum imports natural gas to Finland and promotes the circular economy by processing waste and producing biogas and recycled nutrients in Finland and Sweden. The company offers energy for heat and power production, industry as well as road and maritime transport. Gasum is the leading supplier of biogas in the Nordic countries. The Gasum Group employed 409 people in Finland, Norway and Sweden at the end of 2017. The company’s net sales was €925 million in 2017.
Case published 21.6.2018
Titanium – Acquisition of Investium Companies
We advised Titanium Oyj in a transaction in which it will acquire all the shares in Investium Group Ltd’s subsidiaries. The purchase price will be paid predominantly with Titanium’s shares, and the completion of the transaction is conditional upon, among others, approvals from the Finnish Financial Supervisory Authority and Titanium’s extraordinary general meeting. Investium Companies’ operations include Investium funds, securities brokerage, investment advice, insurance agent operations, life and non-life insurance brokerage and a legal services. In 2017, the turnover of Investium Companies amounted to approximately EUR 4.6 million and the result of the financial period to approximately EUR 0.2 million. Titanium is a growth company focusing on special investment funds investing in care properties and housing and asset management services. Titanium’s turnover in 2017 amounted to EUR 10.2 million and profit excluding group goodwill amortisations to EUR 6.1 million. Titanium’s shares are admitted to trading on the First North Finland trading facility maintained by Nasdaq Helsinki.
Case published 20.6.2018
Tiimari – Bankruptcy of Tiimari (Svago Oyj Abp and Svago Retail Oy)
The bankruptcy proceedings of the Tiimari retail chain began in 2013, and C&S Partner Pekka Jaatinen was appointed the estate administrator. The Helsinki stock exchange listed parent company Tiimari Oyj Abp and the operative company Tiimari Retail Oy were both declared bankrupt at the same time. The Tiimari group had 178 stores in Finland and approximately 650 employees. The company also operated in Estonia, Latvia and Lithuania and had been planning to expand to Sweden and Russia. As soon as bankruptcy was declared, we began bankruptcy sales in cooperation with the company’s management. At the same time, the Baltic subsidiaries were wound down in a controlled manner and the parent company was delisted. Eventually, the Tiimari brand was sold and the group’s name was changed to Svago. The income from the bankruptcy sales clearly exceeded the creditors’ expectations and the management’s budget. This success was thanks to the good timing of the bankruptcy sales in the Christmas season and the smooth cooperation between the management, employees and bankruptcy estates. The unsecured creditors received 27% disbursements in the bankruptcy. The bankruptcy proceedings were closed relatively quickly given the scope of the estate when the creditors approved the final accounts on 14 November 2017.
Case published 22.1.2018
International reinsurance companies – Ad hoc arbitration proceedings
We successfully represented a panel of reinsurance companies in an international ad hoc arbitration. The dispute arose out of a reinsurance treaty under the terms of which the reinsurers had reinsured a portfolio of risks underwritten by the cedent. The parties disagreed as to whether the reinsurance provided coverage for a certain loss that had occurred because of the market turmoil caused by the Covid-19 pandemic. The case involved highly complex legal and contractual questions requiring special expertise on reinsurance law and practice. The arbitral tribunal rejected the counterparty’s claims for reinsurance compensation against our clients in full. The amount in dispute was approximately EUR 34 million.
Case published 16.9.2025
byFounders.vc – DataCrunch’s USD 64 million Series A funding round
We supported byFounders.vc as the Finnish counsel in their investment in DataCrunch Oy in a USD 64 million Series A funding round. DataCrunch provides scalable AI compute solutions from energy-efficient data centers in Iceland and Finland. byFounders.vc is the community-powered early-stage venture fund investing in globally ambitious teams connected to the Nordic and Baltic countries.
Case published 11.9.2025
Springvest – ReOrbit’s EUR 45 million Series A funding round
We advised Springvest Oyj in organising a EUR 45 million Series A funding round for ReOrbit, a space technology company and a leading provider of software-first satellites. It’s the largest all-equity Series A round in Finland and one of the most significant deals overall in the European space and defence sector. The purpose of the funding round is to support ReOrbit’s growth. The round consisted of a private placement reserved for professional and institutional investors, which included, e.g. Icebreaker.vc, Expansion VC, 10xFounders, Inventure VC, Varma Mutual Pension Insurance Company, and Elo Mutual Pension Insurance Company, and an EUR 8 million public share offering, which was oversubscribed within 4.5 hours. Springvest is a Finland-based investment firm that connects unlisted growth companies with investors. ReOrbit builds sovereign satellites and connected systems for national security.
Case published 9.9.2025

Get to know our other experts in the field

Tomi Kemppainen
Position: Partner
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 +358 40 354 2204
Mats Forsius
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 +358 50 357 1726
Mikko Hanni
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 +358 40 922 5703
Suvi Kettunen
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Jutta Nieminen
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Laura Häyrinen
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Ville Kukkonen
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Mari Kulmakorpi
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 +358 20 776 5016
Werner Laitinen
Position: Associate
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 +358 50 556 3751
Anniina Perkiö
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 +358 40 707 2405
Sofia Seppänen
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 +358 50 550 1274