Jarno Tanhuanpää

Managing Partner, Member of the Finnish Bar, M.Sc. (Econ.)

I am Castrén & Snellman’s managing partner. I have over twenty years of experience in transactions covering private equity and venture capital, M&A and capital markets. I have advised clients in a large number of complex cross-border deals, both public and private, as well as led numerous financing rounds, investments and exits. I head our Private Equity and Venture Capital Service.

Through my work experience, I have a thorough understanding of financial markets and international business transactions. Having worked at the European Investment Bank in Luxembourg for several years, I have extensive knowledge and expertise in funds and financing. I also have international experience working in London at a leading international law firm.

In addition to my Master of Laws degree, I also hold an M.Sc. in Banking and Finance.

Latest references

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
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
Castrén & Snellman advised the lead investors Ten Eleven Ventures and Tesi in the EUR 275 million Series B financing round of IQM Quantum Computers, the global leader in building quantum computers. The round is largest Series B round ever in Finland and the second largest in the Nordics. In addition to the lead investors represented by C&S, the round was participated by several new and existing investors, including pension funds Elo Mutual Pension Insurance and Varma Mutual Pension Insurance, strategic investors Companies of Schwarz Group and Winbond Electronics Corporation, and sovereign wealth funds EIC and Bayern Kapital. Ten Eleven Ventures is the original cybersecurity-focused, global, and stage-agnostic investment firm. The firm identifies, invests in, and helps grow top cybersecurity companies addressing critical digital security needs, leveraging its team, network, and experience to build successful businesses. Since its founding, Ten Eleven Ventures has raised over USD 1 billion and made over 60 cybersecurity investments across various stages worldwide. Tesi (Suomen Teollisuussijoitus Oy / Finnish Industry Investment Ltd) is a state-owned investment company with an industrial policy mission focused on driving economic growth, renewal, and investments. Tesi invests on market terms both in venture capital and private equity funds, and directly in startups, scale-ups, and large industrial projects. IQM Quantum Computers, founded as a deep tech spin-off from Aalto University in 2019, specialises in developing quantum computers utilizing superconducting circuits. The company designs and produces quantum processors at its facility in Espoo, providing computing solutions and optimizations tailored to both research and industrial applications. In addition to its Finnish operations, IQM has expanded its presence to Germany, France, Italy, Japan, Poland, Spain, Singapore, South Korea, and the United States.
Case published 4.9.2025
We represented Vapaus Group, a leading provider of employee bicycle benefit services, in its cross-border acquisition of Azfalte, a French corporate bicycle solutions company. The acquisition accelerates Vapaus Group’s international expansion and strengthens its position in sustainable mobility by combining Vapaus’s digital platform and circular-economy capabilities with Azfalte’s established enterprise programs and partner network in France. The transaction advances Vapaus’s growth strategy and increases its ability to help employers meet well-being and sustainability goals in one of Europe’s most dynamic cycling markets. Vapaus Group is at the forefront of sustainable mobility services and has been a pioneer in the employee bicycle benefit sector since 2020 with a vision to become the leading bicycle benefit service in Europe. Vapaus has automated the employee bicycle process through its technology platform, covering payroll, invoicing, logistics, insurance, and financing. Azfalte, founded in 2020, is a pioneer of corporate cycling in France, optimizing financing, tailored bikes, insurance, maintenance, assistance, training, and carbon tracking for the benefit of its clients.
Case published 1.9.2025
We acted as legal advisor to OP Finland Infrastructure LP in connection with the conversion of the fund’s agreed EUR 50 million convertible bond into shares in Lounea Net Oyj in 2023. In connection with the conversion, the fund made a new additional investment of EUR 10 million in Lounea. As a result of the arrangement, OP Suomi Infra became a significant owner of Lounea Net Oyj with a 29% stake. Lounea is a Finnish optical fibre operator whose business consists of telecommunications infrastructure and ICT solutions. OP Finland Infrastructure is a fund investing in Finnish infrastructure. The fund is managed by OP Financial Group.
Case published 29.8.2025
We advised Aker Arctic Technology Inc, a company specialised in icebreaker design, in its acquisition of Bluetech Finland Ltd. Under the signed agreement, Aker Arctic and Bluetech transferred to the ownership of Arctic Marine Technology Group Oy, an entity established for the purpose of owning the companies. Arctic Marine Technology Group is owned by Finnish Industry Investment (Tesi) and ABB, the current shareholders of Aker Arctic. The completion of the transaction required the approval of the Finnish Ministry of Economic Affairs and Employment and the fulfilment of other customary closing conditions. Aker Arctic Technology Inc is a private company specialising in the technology development, design, engineering, special products, consulting and testing services for ice-going vessels and icebreakers. Bluetech Finland Ltd specialises in cruise, ro-pax and cargo ship design, offering engineering services for ship owners, shipyards and marine suppliers.
Case published 26.6.2025
We advised Huelsenberg Holding, a German group holding company, in a transaction whereby its subsidiary Schaumann Agri Austria GmbH & CO. KG acquired the entire share capital of RV Eurotrading Oy. Eurotrading will continue to operate as an independent subsidiary within the Schaumann Group. The transaction does not affect Eurotrading’s products, services or customer agreements. Schaumann is one of Europe’s leading manufacturers of speciality mineral feeds, probiotics and biological silage additives. Eurotrading provides agricultural professionals with profitability-enhancing products and has been a Schaumann product representative in Finland for over 25 years. 
Case published 20.2.2025
We supported byFounders.vc as the Finnish counsel in their investment in DataCrunch Oy in a USD 13 million seed funding round led by byFounders. DataCrunch provides scalable AI compute solutions from energy-efficient data centers in Iceland and Finland. byFoundersVC is the community-powered early-stage venture fund investing in globally ambitious teams connected to the Nordic and Baltic countries.
Case published 29.1.2025