Sebastian Palomäki

Senior Associate, LL.M.

Services

  1. Capital Markets & Public M&A
  2. Private Equity
  3. Financial Regulation

Contact details

I advise our domestic and international clients in various assignments related to capital markets transactions and financial regulation. I also advise our clients in private equity and venture capital investments as well as private M&A.

I have over a decade of international experience studying at international schools in Helsinki as well as studying for my university degrees abroad. I completed my Master of Laws degree at the University of Oslo. During my studies I specialised in various financial regulatory matters with a strong emphasis in emerging technologies.

I joined Castrén & Snellman in 2019 as a trainee. I worked in several trainee positions, which helped me to develop experience in multiple areas of business and financial law.

I’m committed to helping clients and providing sound legal advice in all matters relating to business and financial law. I strive to build trust and long-term relationships by providing sincere communication on legal matters. Through my experience outside of the legal profession, I’m also able to provide outside-the-box solutions to help our clients achieve their goals.

Latest references

WithSecure – Diana BidCo’s public tender offer on WithSecure
We are acting as the legal advisor to WithSecure Corporation in Diana BidCo Oy’s voluntary public cash tender offer for all the issued and outstanding shares in WithSecure. The tender offer values WithSecure’s total equity at approximately EUR 299 million. Diana BidCo is a private limited company incorporated and existing under the laws of Finland that will be indirectly owned by a consortium formed for purposes of the tender offer by certain affiliated funds of CVC Capital Partners Plc and Risto Siilasmaa. The consortium believes that the partnership strengthens and accelerates the road to WithSecure’s long-standing goal of becoming Europe’s most trusted cybersecurity partner by positioning the company to lead the next era of business cybersecurity. WithSecure’s shares are listed on the official list of Nasdaq Helsinki. WithSecure is a Europe-based cybersecurity company that helps protect businesses and is committed to strong partnerships with customers and collaborators. WithSecure’s customers trust WithSecure with outcome-based cybersecurity that protects and enables their operations. The completion of the tender offer is subject to the satisfaction or waiver by the offeror of certain customary conditions on or prior to the offeror’s announcement of the final results of the tender offer. The tender offer is currently expected to be completed during the fourth quarter of 2025. The Takeover Board of the Securities Markets Association issued on 4 August 2025 a new recommendation (1/2025) on good securities market practice that deals with the target company’s board of directors’ obligations in case of a consortium offer in which a major shareholder of the company participates in the consortium.
Case published 8.8.2025
The Mortgage Society of Finland – Update of EUR 2,5 billion bond programme
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
Piippo – Sale of bale netwrap and baler twine machines and certain trademarks
We are acting as legal advisor to Piippo Plc in the sale of their bale netwrap and baler twine machines, related assets, and trademarks used in Piippo’s business to Portuguese Cotesi S.A. The sale of assets will be carried out in two phases and the final completion of the transaction is expected to occur during the first quarter of 2026. Piippo Oyj’s core business is baling nets and twine and it is one of the leading suppliers in the industry globally. The company’s global distribution network covers more than 40 countries. The company’s shares are listed on the First North Growth Market Finland operated by Nasdaq Helsinki Oy. Founded in 1967, Cotesi is one of the world’s leading producers of synthetic and natural twines, nets and ropes, with operations in Europe, North America and South America and its main production plant in Vila Nova de Gaia, Portugal.
Case published 17.4.2025
Korkia Oy – Renewable energy loan agreement
We advised Korkia Oy in its loan agreement with Nordic Environment Finance Corporation. The financing will support the development and international scale-up of Korkia’s pipeline of solar energy, battery energy storage system (BESS) and onshore wind projects. Korkia is a dedicated investor in renewable energy operating in nine countries. It has a robust development pipeline of over 20 GW in renewable energy and energy storage projects.
Case published 7.1.2025
SATO – Rights Issue
We advised SATO Corporation and lead manager Skandinaviska Enskilda Banken AB (publ) Helsinki Branch in a rights issue. SATO received gross proceeds of approximately EUR 200 million from the issue. SATO Corporation is an expert in sustainable rental housing and one of Finland’s largest rental housing providers. SATO owns around 25,000 rental homes in the Helsinki Metropolitan Area, Tampere and Turku. Approximately 45,000 residents live in SATOhomes.
Case published 29.2.2024
Purmo Group – Issue of EUR 60 million green hybrid bond
We advised Purmo Group Plc in the issue of a EUR 60 million green hybrid bond. The rationale for the issue is to ensure funding for Purmo Group’s strategy acceleration programme. In connection with the issue, Purmo Group published a green finance framework to integrate the company’s sustainability ambitions into its funding. The net proceeds from the issue will be used in accordance with Purmo Group’s green finance framework. Purmo Group is a leader in sustainable indoor climate comfort solutions in Europe. Purmo Group provides complete heating and cooling solutions to residential and non-residential buildings, including radiators, underfloor heating, heat pumps, towel warmers, valves and controls.
Case published 17.2.2023
Reka Industrial – Sale of Reka Cables to Nexans Group
We are acting as the legal advisor to Reka Industrial Plc in the sale of its wholly owned subsidiary Reka Cables Ltd, which operates the cable business of Reka Industrial. The purchase price of the shares is EUR 53 million and will be paid in cash. According to the Finnish Accounting Standards, the net debt of Reka Cables at the end of September 2022 was EUR 6.5 million. The completion of the transaction, conditional on the approval of the Extraordinary General Meeting of Reka Industrial and approvals by competent regulatory authorities, is expected to take place during the first half of 2023. Reka Oy, representing in aggregate 65.36% of the voting rights in Reka Industrial, has irrevocably undertaken to vote in favour of the transaction at the Extraordinary General Meeting. Reka Cables is the largest Finnish-owned cable manufacturer, which has been at the forefront of the cable industry for more than 60 years. Reka Cables provides durable, high-standard cable solutions for renewable energy production, network construction and industry as well residential and office construction. Reka Cables has approximately 270 employees, and the turnover in 2021 was EUR 134 million. 
Case published 10.11.2022
QPR Software – Rights Issue
We advised QPR Software Plc and lead manager Evli Plc in a rights issue. A Finnish language EU Recovery Prospectus, approved by the Financial Supervisory Authority, was published in conjunction with offering. The issue was oversubscribed, and the company raised gross proceeds of approximately EUR 3.45 million. Trading with the new shares subscribed for in the issue commenced on Nasdaq Helsinki Ltd today. “I am very pleased with the outcome of the rights issue and the great interest of investors in the implementation of our company’s growth strategy. I would like to extend my warm thanks to all the old and new shareholders of QPR Software Plc for their trust in the company. As we have previously announced, the excellent result of the rights issue will enable the implementation of our growth strategy according to the company’s plans. The oversubscribed offering is a sign of strong faith in the company’s growth and its results are an important milestone to strengthen our position as a leading SaaS company in a rapidly growing process mining market”, notes Jussi Vasama, CEO of QPR Software Plc. QPR Software Plc provides process mining, performance management and enterprise architecture solutions for digital transformation, strategy execution, and business process improvement in over 50 countries. QPR software Plc allows customers to gain valuable insights for informed decisions that make a difference.
Case published 20.6.2022
Show more

Get to know our other experts in the field

Janne Lauha
Position: Partner
Primary service Capital Markets & Public M&A
 +358 50 567 1871
Hannu Huotilainen
Position: Counsel, Regulatory
Primary service Capital Markets & Public M&A
 +358 50 357 1446
Teresa Kauppila
Position: Counsel, Partner Elect
Primary service Capital Markets & Public M&A
 +358 20 776 5308
Anna-Maarit Laurila
Position: Counsel
Primary service Capital Markets & Public M&A
 +358 50 595 4746
Sami Lommi
Position: Counsel, Compliance Officer, Head of Risk Management
Primary service Capital Markets & Public M&A
 +358 40 767 1883
Sakari Sedbom
Position: Counsel
Primary service Capital Markets & Public M&A
 +358 40 594 9983
Viola Valtanen
Position: Senior Associate
Primary service Capital Markets & Public M&A
 +358 44 372 3733
Karin Hentunen
Position: Associate
Primary service Capital Markets & Public M&A
 +358 40 028 6477
Sari Suutari
Position: Associate
Primary service Capital Markets & Public M&A
 +358 50 362 3094