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

Hiab acquisition financing
We are advising Hiab Corporation in the financing for its USD 1,035 million acquisition of Labrie Environmental Group, a leading North American refuse collection vehicle (“RCV”) manufacturer, from Wynnchurch Capital, L.P. Hiab Corporation (Nasdaq Helsinki: HIAB) is a leading provider of smart and sustainable on-road load handling solutions, with 2025 sales of approximately EUR 1.6 billion and approximately 4,000 employees, operating through a global network spanning over 100 countries. Labrie Group is a leading North American provider of RCVs, employing approximately 1,200 people. 
Case published 1.6.2026
We advised an international bank syndicate in a EUR 300 million revolving credit facility (RCF) for ICEYE, the world leader in sovereign intelligence from space. The bank-syndicate comprised Nordic and global banks, with Citi and Danske Bank acting as Joint Global Coordinators and Mandated Lead Arrangers. The RCF will support the issuance of guarantees for customer contracts, enable continued business growth, and serve as a liquidity backstop. 
Case published 21.5.2026
We advised Huhtamäki Oyj on its issuance of a EUR 300 million 6-year senior unsecured bond under the EMTN programme and on the tender offer of its EUR 500 million senior unsecured bond maturing in 2027. The new bond bears interest at a fixed rate of 3.875 per cent per annum. Huhtamäki used the net proceeds from the issuance of the new bond for the partial repurchase of its bond maturing in 2027 and for general corporate purposes.
Case published 21.5.2026
We advised Aktia Bank Plc on the issuance of an EUR 80 million Additional Tier 1 (AT1) bond. The bond pays a fixed interest rate of 6.75 per cent semi-annually. The bond is perpetual, and Aktia has the right to redeem or repurchase it in accordance with the terms of the bond, subject to certain conditions. The bond was issued on 1 April 2026. In addition, we assisted Aktia in listing the bond on the Nasdaq Helsinki Ltd stock exchange. For the listing, we prepared Finland’s first EU Follow-on prospectus for a bond. The EU Follow-on prospectus was introduced on 5 March 2026 with an update to the Prospectus Regulation (EU) No. 2017/1129. The EU Follow-on prospectus is a new type of prospectus that can be used, among others, by issuers whose securities have been admitted to trading on a regulated market continuously for at least the 18 months preceding the offer to the public or the admission to trading on a regulated market of the new securities. A follow-on prospectus is simpler than a so-called traditional prospectus, and it is intended to avoid repeating information that the issuer has already disclosed. Nordea Bank Abp acts as the sole structuring advisor for the issue of the Notes. Nordea Bank Abp, Danske Bank A/S and ABN Amro Bank N.V. act as the lead managers for the issue of the Notes. 
Case published 7.4.2026
We advised CapMan Infra’s portfolio company Koiviston Auto Group, Finland’s largest bus operator, in a finance arrangement in which it completed an approximately EUR 300 million refinancing. The transaction consists of the refinancing of the Group’s existing senior debt and secures long-term growth financing to support the Group’s continued investments in its rapidly expanding electric bus fleet. The financing package has been provided by a group of lenders consisting of Nord/LB, ABN AMRO, Edmond de Rothschild, LBP AM and Siemens. The transaction strengthens Koiviston Auto’s funding base and provides significant flexibility to execute the company’s growth strategy focused on sustainable public transportation. CapMan Nordic Infrastructure I acquired Koiviston Auto in December 2021 to support its expansion and operational development. The Group now serves communities nationwide and is at the forefront of the transition to zero-emission public transport in Finland. It operates approximately 300 electric buses, with more than 50 additional electric buses expected to be deployed into traffic during 2026, further accelerating the electrification of its fleet. “The successful completion of this refinancing marks an important milestone for Koiviston Auto Group,” says Henrik Mikkola, CEO of Koiviston Auto Group. “The strong support from a diversified group of high-quality lenders underlines the robustness of our business and our long-term strategy. This financing allows us to continue investing in electric mobility and to provide reliable, sustainable and high-quality public transport services across Finland.” “Koiviston Auto Group plays a key role in the green transition of public transportation in Finland,” comments Ville Poukka, Managing Partner at CapMan Infra. “This refinancing significantly strengthens the company’s financial platform and enables continued investments into electric buses at scale. We are pleased to see strong lender confidence in the company’s strategy, operational performance and long-term growth prospects.”
Case published 25.3.2026
We advised Fingrid Oyj on the Finnish law aspects in the update of a EUR 3 billion Euro Medium Term Note programme (EMTN). Notes issued under the programme may be listed on the Irish Stock Exchange. Fingrid operates Finland’s main electricity transmission grid and all significant cross-border transmission connections. The main grid is the backbone of the electricity transmission network, to which major power plants, industrial plants and regional electricity distribution networks are connected.
Case published 17.3.2026
We advised a leading global investment firm Brookfield, alongside a global sovereign wealth investor, on the Finnish law aspects of a EUR 1 billion holdco financing for DayOne Data Centers, a Singapore-headquartered developer and operator of hyperscale data centres. Structured as a seven-year secured holdco financing facility of €500 million, expandable to €1 billion – and secured by DayOne’s Finland platform – the financing will support the rollout of hyperscale developments in Lahti and Kouvola, providing nearly 300MW of planned capacity across Finland. The proceeds will also support DayOne’s global expansion across the EU and APAC, with flexibility to allocate to other key growth markets as required.
Case published 29.1.2026
We advised OP Corporate Bank and Skandinaviska Enskilda Banken (SEB) in the EUR 200 million financing of Sello Shopping Centre, one of the Nordic countries’ largest and most diverse shopping centres. The shopping centre is owned by Finnish pension insurance companies Keva, Elo and Ilmarinen. Sello is a pioneer in sustainable development, featuring an intelligent energy system and 2,300 solar panels. The shopping centre holds the highest LEED Platinum environmental certification, becoming the first shopping centre in Europe to achieve this distinction. Sello has demonstrated outstanding operational performance throughout 2025, achieving record visitor numbers and sales figures. 
Case published 29.1.2026