Security & Defence 

Security & Defence 

The security landscape in Europe has fundamentally changed in recent years. Shifting geopolitical realities and accelerated technological development are creating both new opportunities and new challenges for security and defence operators.

Companies in this field must navigate a highly regulated and rapidly evolving environment. They face increasingly complex compliance requirements, heightened scrutiny around investments and ownership, and growing expectations around ethics and responsible business conduct.

Legal advisor to the security and defence sectors

Castrén & Snellman provides top-tier legal services to domestic and international clients operating in the security and defence industries. Our deep industry knowledge helps clients anticipate legal risks and seize strategic opportunities in a changing world.

We advise both private and public sector organisations across the full corporate lifecycle, from early-stage funding and cross-border structuring to strategic partnerships and regulatory risk management.

Our clients include defence sector authorities, defence tech developers, dual-use manufacturers, critical infrastructure operators, public authorities, institutional investors, banks and venture capital and private equity funds. Many are driving innovation in areas such as space, cybersecurity, AI, connectivity and sustainable technologies.

As the go-to supplier of legal services, we advise security and defence operators, as well as their business partners, on matters such as:

Castrén & Snellman is a trusted legal partner in matters where national security, regulation and geopolitical complexity intersect. Our legal advice helps safeguard operational continuity, promote responsible growth, and support the strategic resilience of the security and defence ecosystem.

Latest references

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
We acted as Finnish legal advisor to HANZA AB in connection with its acquisition of the contract manufacturing division of Milectria, a group of companies specialising in electrical systems for the defence industry.  The transaction comprises 100% of the shares in Milectria Oy (Finland), Milectria OÜ (Estonia), and the real estate company Kiinteistö Oy Kanungin Karhu. The transaction is expected to close in September 2025, subject to customary closing conditions, including regulatory approvals.  Founded in 2008, HANZA is a Swedish mechanical engineering and electronics contract manufacturing company listed on the Nasdaq Stockholm main list. The company operating in seven countries currently has annual sales of approximately SEK 6 billion and approximately 3,100 employees. Milectria is a Finnish contract manufacturer of electrical systems for the defence industry.
Case published 21.7.2025
We advised Milexia Group, a portfolio company of the French PE sponsor Crédit Mutuel Equity, on its acquisition of the activities of Alpha Positron Oy, a Finnish distributor specializing in GPS/GNSS, time and frequency solutions for the electronics industry, process automation, corporate IT, defense, and other demanding markets. Milexia Group is one of the world’s leading European suppliers for high-quality electronic components, systems and scientific instruments technology. It has offices, warehouses and technical centres in France, Italy, Spain, the United Kingdom, Germany, Nordics and Hong Kong. The acquisition aligns with Milexia’s strategy to expand its presence in the Nordic region and enhance its portfolio of communication solutions.
Case published 24.4.2025
We advised WithSecure Corporation in the sale of its cybersecurity consulting business to Neqst. WithSecure is a global cyber security company (listed on NASDAQ OMX Helsinki). Neqst is a Swedish investment firm, focusing on technology companies. The closing of the transaction remains subject to customary conditions and regulatory approvals.
Case published 24.1.2025