Valter Olkkonen

Senior Associate, Member of the Finnish Bar

I assist our clients in various financing transactions.

Before joining Castrén & Snellman, I worked as a trainee at a major law firm in the United Kingdom and at a Big Four accounting firm in Finland.

In addition to my Master of Laws degree from the University of Helsinki, I have studied law at the University of Edinburgh.

Latest references

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 acted as the Finnish legal counsel for the funders to Nevel Oy in a EUR 665 million refinancing arrangement through a mix of multicurrency bank loans and private placement notes. Nevel is a utility infrastructure company offering advanced industrial and real estate infrastructure solutions that are fit-for-purpose and future-proof. The transaction supports Nevel’s growth strategy and its goal to help customers to achieve climate goals.
Case published 20.8.2025
We advised Triton Partners and Habeo Group in a leveraged financing arrangement with Danske Bank A/S, Nordea Bank Abp and Skandinaviska Enskilda Banken AB. The financing included facilities amounting to EUR 80 million for refinancing, acquisitions and other general corporate purposes. Habeo Group is a comprehensive service provider in the technical building services sector, cultivating the value of buildings throughout their lifecycle. The group employs some 600 technical building services professionals. In 2023, we advised Triton in its platform investment, the formation of Habeo Group, through its acquisition and financing of eight Finnish companies.  
Case published 7.8.2025
We advised The Mortgage Society of Finland in the update of a EUR 2,5 billion bond programme under which the Mortgage Society of Finland may issue senior preferred and unsecured Tier 2 notes, and covered bonds. The notes under the programme may be listed on the official list of Nasdaq Helsinki Ltd.  The Mortgage Society of Finland is the only nationwide credit institution in Finland that focuses on housing. It provides customers with the full range of home financing services such as granting mortgage and consumer loans for all stages of home owning including purchasing and renovating. The Mortgage Society of Finland carries out this activity in accordance with the Act on Credit Institutions and the Act on Mortgage Societies.
Case published 5.8.2025
We advised on the issuance of a EUR 10 million equity-classified convertible hybrid bond by Boreo Plc to the Norwegian insurance company Protector Forsikring ASA. The annual coupon interest on the bond is a fixed 4 percent until the reset date on 24 June 2030, after which the interest rate increases to 14 percent. The bondholders have the right to convert the principal amount into Boreo shares at a price of EUR 19 per share during a four-year period following the issuance. The bond is not intended to be admitted to trading on a stock exchange or any other trading venue. It has no specified maturity date, and Boreo has the right to redeem it for the first time after four years from the issuance date. ‘We are very pleased to have completed the transaction, and with the confidence Protector has shown in the company. The arrangement supports the execution of our acquisition-driven growth strategy, strengthens the company’s financial position, and lowers financing costs,’ says Kari Nerg, CEO of Boreo. OP Corporate Bank plc acts as the lead manager for the issuance of the convertible hybrid bond. Castrén & Snellman Attorneys Ltd serves as legal advisor to the transaction, and Legal Folks Ltd acts as Boreo’s legal advisor.
Case published 24.6.2025
We advised Metsä Board Corporation on the issuance of senior unsecured green notes of EUR 200 million. The maturity of the notes is six years, and they mature on 28 May 2031.  The notes carry fixed annual interest of 3.875 per cent., and the issue price of the notes is 99.570 per cent. The notes were allocated to both Finnish and foreign investors. ‘We are delighted with the trust and interest shown by investors in Metsä Board’s first green bond. This arrangement extends the maturity of our financing and supports our strategy to grow in fibre-based packaging materials and renew our industrial operations. It also contributes to the achievement of our ambitious sustainability targets for 2030’, comments Henri Sederholm, CFO of Metsä Board. Danske Bank A/S and Skandinaviska Enskilda Banken AB (publ) acted as joint lead managers for the issue of the Notes.
Case published 27.5.2025
We advised Fingrid Oyj on the Finnish law aspects of the update of an EMTN programme and increase to EUR 3 billion. Notes issued under the programme may be admitted to trading on Euronext Dublin. Fingrid Oyj is Finland’s transmission system operator.
Case published 2.4.2025
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