Home PeopleKlaus Ilmonen Practices Capital Markets Corporate Advisory Corporate Sustainability and ESG M&A, Private M&A, Public Industries Consumer & Retail Defence Engineering & Machinery Financial Services & Insurance Mobility, Transportation & Logistics Public Sector Technology, Media & Telecom Languages English, Finnish, Swedish Assistant Melisa Göllü Download CV Download contact Send secure email LinkedIn Klaus Ilmonen Title: Partner, Doctor of Laws Corporate Advisory, Capital Markets, M&A Email: klaus.ilmonen@hannessnellman.com Mobile: +358 40 831 1868 Languages: English, Finnish, Swedish Assistant: Melisa Göllü Assistant email: melisa.gollu@hannessnellman.com Practices Capital Markets Corporate Advisory Corporate Sustainability and ESG M&A, Private M&A, Public Industries Consumer & Retail Defence Engineering & Machinery Financial Services & Insurance Mobility, Transportation & Logistics Public Sector Technology, Media & Telecom Languages English, Finnish, Swedish Assistant Melisa Göllü Download CV Download contact Send secure email LinkedIn Klaus Ilmonen advises on corporate transactions involving public corporations. His practice includes public takeovers, equity capital markets, and corporate governance of publicly traded corporations. He is recognised for his expertise in complex takeover situations and in international capital markets transactions. In public takeovers, Klaus has advised financial sponsors and industrial offerors and the boards and shareholders of acquired corporations. He has participated in drafting Finnish takeover regulation, including the first Helsinki Takeover Code. Klaus also advises on capital markets transactions, including IPOs, rights offerings, and private offers of securities. He has previously practised U.S. securities law in the London office of the U.S. law firm Cleary, Gottlieb, Steen & Hamilton, where he represented European issuers and underwriters in international securities offerings. Klaus has been appointed professor of practice at the Hanken School of Economics in Helsinki and teaches corporate and securities law. He has also served on a consultative group for developing EU corporate finance regulation. Klaus has been deployed with Finnish forces in Afghanistan, Kosovo, and Lebanon, and he serves as the managing director of the Mannerheim-Foundation in Finland. “Very well-respected, skilful and experienced capital markets lawyer” Chambers Global 2022 “Klaus Ilmonen is the brilliant head of the practice” Capital Markets, Legal 500, 2020 “Clients say he has an ‘encyclopedic knowledge of the issues and is very collaborative when working with the other side.” Chambers Europe 2020 Selected References Counsel to the Prime Minister’s Office in the rights offering of Finnair Plc, 2023 Parties: Prime Minister’s Office, Finnair Plc Transaction: Hannes Snellman acted as counsel to the Prime Minister’s Office in the rights offering of Finnair Plc, the Finnish airline with the State of Finland being the majority owner. Hannes Snellman advised, among other, on the share subscription made by the State of Finland by way of offsetting, in part, a capital loan provided by the State of Finland to Finnair, and related state-aid law matters. The rights offering of EUR 570 million is one of the largest rights offerings in Finland in recent years. Deal value: Approximately EUR 570 million Role: Counsel to Prime Minister’s Office Contacts Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Mikko Huimala Partner +358 44 530 0753 mikko.huimala@hannessnellman.com Riikka Rannikko Partner +358 40 731 1611 riikka.rannikko@hannessnellman.com Mikko Heinonen Partner +358 40 527 8818 mikko.heinonen@hannessnellman.com Heikki Majamaa Specialist Partner +358 44 544 2873 heikki.majamaa@hannessnellman.com Robert Gordin Senior Associate +358 44 079 9799 robert.gordin@hannessnellman.com Jon Termonen Managing Associate +358 40 767 6347 jon.termonen@hannessnellman.com Counsel to Uponor Corporation in the recommended public cash tender offer for all shares in Uponor by Georg Fischer Ltd, 2023 Parties: Uponor Corporation (target), Georg Fischer Ltd (buyer) Transaction: Counsel to Uponor Corporation in the recommended public cash tender offer by Georg Fischer Ltd to purchase all of the issued and outstanding shares of Uponor Corporation. Value: EUR 2.1 billion Role: Counsel to Uponor Corporation Contacts Mikko Heinonen Partner +358 40 527 8818 mikko.heinonen@hannessnellman.com Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Sonja Siggberg Partner +358 40 837 6967 sonja.siggberg@hannessnellman.com Aki Salmela Senior Associate +358 50 307 9056 aki.salmela@hannessnellman.com Jon Termonen Managing Associate +358 40 767 6347 jon.termonen@hannessnellman.com Viola Karjalainen Associate +358 45 130 6206 viola.karjalainen@hannessnellman.com Roope Sevón Associate +358 44 281 9880 roope.sevon@hannessnellman.com Wilma Montonen Associate +358 44 030 5990 wilma.montonen@hannessnellman.com Mikko Huimala Partner +358 44 530 0753 mikko.huimala@hannessnellman.com Sofia Saarelainen Associate +358 50 490 4130 sofia.saarelainen@hannessnellman.com Annika Grönholm Associate +358 44 253 5358 annika.gronholm@hannessnellman.com Heikki Vesikansa Partner +358 40 844 2117 heikki.vesikansa@hannessnellman.com Harri Vehviläinen Specialist Partner +358 40 183 1636 harri.vehvilainen@hannessnellman.com Jenni Parviainen Managing Associate +358 40 808 6523 jenni.parviainen@hannessnellman.com Isabella Kartila Senior Associate +358 44 514 3829 isabella.kartila@hannessnellman.com Johanna Haltia-Tapio Specialist Partner +358 40 552 3478 johanna.haltia-tapio@hannessnellman.com Janika Manner Senior Legal Assistant +358 50 331 6568 janika.manner@hannessnellman.com Monika Parkkinen Legal Assistant +358 40 086 0696 monika.parkkinen@hannessnellman.com Anni Nohteri Legal Assistant + 358 40 682 2161 anni.nohteri@hannessnellman.com Melisa Göllü Legal Assistant +358 40 612 6240 melisa.gollu@hannessnellman.com Finnish counsel to Fortum in the arrangements related to stabilisation of its German subsidiary Uniper SE, 2022 Parties The German State (Buyer), Fortum Oyj (Seller), Uniper SE (Target) Transaction Fortum Oyj’s arrangements related to stabilisation of its German subsidiary Uniper SE. The package will ensure multi-billion funding for Uniper, sale of Fortum’s shareholding in Uniper to the German State for approximately EUR 0.5 billion as well as repayment of Fortum’s EUR 4 billion receivables from Uniper and release of EUR 4 billion parent company guarantees. Deal value Approx. EUR 4.5 billion Role Finnish counsel to Fortum Oyj Contacts Mikko Heinonen Partner +358 40 527 8818 mikko.heinonen@hannessnellman.com Antti Nyberg Partner +358 40 838 9375 antti.nyberg@hannessnellman.com Sonja Siggberg Partner +358 40 837 6967 sonja.siggberg@hannessnellman.com Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Markus Bremer Partner +358 40 716 9676 markus.bremer@hannessnellman.com Mikko Huimala Partner +358 44 530 0753 mikko.huimala@hannessnellman.com Jan Lilius Specialist Partner +358 40 556 6782 jan.lilius@hannessnellman.com Johanna Haltia-Tapio Specialist Partner +358 40 552 3478 johanna.haltia-tapio@hannessnellman.com Matias Moberg Partner +358 40 867 4634 matias.moberg@hannessnellman.com Robert Gordin Senior Associate +358 44 079 9799 robert.gordin@hannessnellman.com Sofi Lehtinen Senior Associate +358 40 620 7199 sofi.lehtinen@hannessnellman.com Counsel to the offeror consortium in the recommended public cash tender offer for all shares in Caverion, 2022 Parties A consortium consisting of Security Trading, Fennogens Investments, Corbis, and Bain Capital (buyer), Caverion Oyj (Target) Transaction Counsel to the offeror consortium consisting of Security Trading, Fennogens Investments, Corbis, and Bain Capital in the recommended public cash tender offer for all shares in Caverion Oyj. Deal value EUR 955 million Role Counsel to the offeror consortium consisting of Security Trading, Fennogens Investments, Corbis, and Bain Capital Contacts Mikko Heinonen Partner +358 40 527 8818 mikko.heinonen@hannessnellman.com Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Anniina Järvinen Partner +358 50 377 1177 anniina.jarvinen@hannessnellman.com Aki Salmela Senior Associate +358 50 307 9056 aki.salmela@hannessnellman.com Tuire Kuronen Partner +358 40 743 2313 tuire.kuronen@hannessnellman.com Riikka Kuha Counsel +358 50 433 9026 riikka.kuha@hannessnellman.com Heikki Vesikansa Partner +358 40 844 2117 heikki.vesikansa@hannessnellman.com Harri Vehviläinen Specialist Partner +358 40 183 1636 harri.vehvilainen@hannessnellman.com Stefan Stellato Managing Associate +358 50 356 5566 stefan.stellato@hannessnellman.com Ilmari Mäkimattila Senior Associate +358 40 667 0867 ilmari.makimattila@hannessnellman.com Counsel to the offeror consortium in the recommended tender offer for Basware Corporation, 2022 Parties Basware Corporation (target), a consortium consisting of Accel-KKR, Long Path Partners, and Briarwood Chase Management (buyer) Transaction Counsel to the offeror consortium of Accel-KKR, Long Path Partners, and Briarwood Chase Management in the tender offer for all outstanding securities in Basware Corporation. Deal Value EUR 620 million Role Counsel to the consortium Contacts Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Tommi Kovero Senior Associate +358 40 523 9292 tommi.kovero@hannessnellman.com Aki Salmela Senior Associate +358 50 307 9056 aki.salmela@hannessnellman.com Robert Gordin Senior Associate +358 44 079 9799 robert.gordin@hannessnellman.com Linnea Lehtonen Senior Associate +358 50 352 4855 linnea.lehtonen@hannessnellman.com Roope Sevón Associate +358 44 281 9880 roope.sevon@hannessnellman.com Heikki Vesikansa Partner +358 40 844 2117 heikki.vesikansa@hannessnellman.com Harri Vehviläinen Specialist Partner +358 40 183 1636 harri.vehvilainen@hannessnellman.com Sofia Ropo Senior Associate +358 40 545 2866 sofia.ropo@hannessnellman.com Mikko Huimala Partner +358 44 530 0753 mikko.huimala@hannessnellman.com Markus Bremer Partner +358 40 716 9676 markus.bremer@hannessnellman.com Pauliina Sutinen Senior Associate +358 50 346 5280 pauliina.sutinen@hannessnellman.com Johanna Haltia-Tapio Specialist Partner +358 40 552 3478 johanna.haltia-tapio@hannessnellman.com Anna Nyberg Senior Associate +358 41 501 9395 anna.nyberg@hannessnellman.com Outi Jousi Specialist Partner +358 40 563 7343 outi.jousi@hannessnellman.com Annika Tiitola Senior Associate +358 45 679 2850 annika.tiitola@hannessnellman.com Axel Hård af Segerstad Senior Associate +358 40 777 3762 axel.hard@hannessnellman.com Counsel to Citycon Oyj in its repurchase of 9,500,000 own shares in a reverse accelerated bookbuild, 2021 Parties Citycon Oyj Transaction Citycon Oyj’s repurchase of a total amount of 9,500,000 own shares for a total purchase price of EUR 65.8 million as a result of a market based reverse accelerated bookbuild process Deal Value EUR 65.8 million Role Counsel to Citycon Oyj Contacts Mikko Heinonen Partner +358 40 527 8818 mikko.heinonen@hannessnellman.com Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Aki Salmela Senior Associate +358 50 307 9056 aki.salmela@hannessnellman.com Counsel to Viking Line on its EUR 51.8 million rights offering, 2021 Parties Viking Line Abp Transaction Counsel to Viking Line Abp on its EUR 51.8 million issue of new shares with pre-emptive rights for existing shareholders. Deal Value EUR 51.8 million Role Counsel to Viking Line Abp Contacts Sonja Siggberg Partner +358 40 837 6967 sonja.siggberg@hannessnellman.com Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Markus Bremer Partner +358 40 716 9676 markus.bremer@hannessnellman.com Hanna Lindberg Senior Associate +358 50 405 7168 hanna.lindberg@hannessnellman.com Stefan Stellato Managing Associate +358 50 356 5566 stefan.stellato@hannessnellman.com Counsel to Valmet in the merger of Valmet and Neles, 2021 Parties Valmet, Neles Transaction Hannes Snellman acted as lead counsel to Valmet, a leading global developer and supplier of process technologies, automation, and services for the pulp, paper, and energy industries, in its merger with Neles, one of the leading providers of mission-critical flow control solutions and services for process industries in Finland. Deal Value The combined value of the merging companies is approximately EUR 7 billion. Role Lead counsel to Valmet Contacts Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Jon Termonen Managing Associate +358 40 767 6347 jon.termonen@hannessnellman.com Annemari Rosi Senior Associate +358 40 573 5304 annemari.rosi@hannessnellman.com Aki Salmela Senior Associate +358 50 307 9056 aki.salmela@hannessnellman.com Sofi Lehtinen Senior Associate +358 40 620 7199 sofi.lehtinen@hannessnellman.com Satu Kokko Senior Associate +358 40 838 9157 satu.kokko@hannessnellman.com Mikko Huimala Partner +358 44 530 0753 mikko.huimala@hannessnellman.com Antti Nyberg Partner +358 40 838 9375 antti.nyberg@hannessnellman.com Pauliina Sutinen Senior Associate +358 50 346 5280 pauliina.sutinen@hannessnellman.com Heikki Vesikansa Partner +358 40 844 2117 heikki.vesikansa@hannessnellman.com Jenni Parviainen Managing Associate +358 40 808 6523 jenni.parviainen@hannessnellman.com Harri Vehviläinen Specialist Partner +358 40 183 1636 harri.vehvilainen@hannessnellman.com Counsel to Terveystalo on its acquisition of 72 per cent of the shares and recommended mandatory takeover offer for Feelgood Svenska AB, 2021 Parties Terveystalo Plc, Terveystalo Healthcare Oy, Feelgood Svenska AB (publ) Transaction Hannes Snellman advised Terveystalo on its acquisition of 72 percent of the shares and recommended mandatory takeover offer for Feelgood Svenska AB (publ) Deal Value SEK 606 million / EUR 60 million Role Counsel Terveystalo Plc and Terveystalo Healthcare Oy Contacts Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Markus Bremer Partner +358 40 716 9676 markus.bremer@hannessnellman.com Matias Moberg Partner +358 40 867 4634 matias.moberg@hannessnellman.com Counsel to the State of Finland in the EUR 400 million hybrid loan arrangement with Finnair Plc, 2021 Parties The State of Finland, Finnair Plc Transaction Counsel to the State of Finland in the hybrid loan arrangement with Finnair Plc Deal Value Up to EUR 400 million Role Counsel to the State of Finland (Prime Minister’s Office) Contacts Riikka Rannikko Partner +358 40 731 1611 riikka.rannikko@hannessnellman.com Markus Bremer Partner +358 40 716 9676 markus.bremer@hannessnellman.com Mikko Huimala Partner +358 44 530 0753 mikko.huimala@hannessnellman.com Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Heikki Majamaa Specialist Partner +358 44 544 2873 heikki.majamaa@hannessnellman.com Counsel to Tikkurila Oyj in the recommended public cash tender offer for all shares in Tikkurila by PPG Industries, Inc., 2020-2021 Parties PPG Industries, Inc. (Bidder), Tikkurila Oyj (Target) Transaction Recommended public cash tender offer for all of the shares in Tikkurila by PPG Industries, Inc. Deal Value EUR 1.5 billion Role Counsel to Tikkurila Oyj Contacts Mikko Heinonen Partner +358 40 527 8818 mikko.heinonen@hannessnellman.com Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Anniina Järvinen Partner +358 50 377 1177 anniina.jarvinen@hannessnellman.com Agda Vähä-Piikkiö Senior Associate +358 50 594 6016 agda.vaha-piikkio@hannessnellman.com Jenni Heurlin Managing Associate +358 40 825 0405 jenni.heurlin@hannessnellman.com Johanna Haltia-Tapio Specialist Partner +358 40 552 3478 johanna.haltia-tapio@hannessnellman.com Satu Kokko Senior Associate +358 40 838 9157 satu.kokko@hannessnellman.com Counsel to Optomed Plc on its IPO and listing on Nasdaq Helsinki Parties Optomed Plc Transaction Optomed’s IPO and listing on the Nasdaq Helsinki stock exchange Deal Value The offering by the company and its shareholders amounted to approximately EUR 44 million Role Counsel to Optomed Plc Contacts Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Antti Kuha Partner +358 40 775 7440 antti.kuha@hannessnellman.com Heikki Vesikansa Partner +358 40 844 2117 heikki.vesikansa@hannessnellman.com Jenni Parviainen Managing Associate +358 40 808 6523 jenni.parviainen@hannessnellman.com Linnea Lehtonen Senior Associate +358 50 352 4855 linnea.lehtonen@hannessnellman.com Pauliina Sutinen Senior Associate +358 50 346 5280 pauliina.sutinen@hannessnellman.com Stefan Stellato Managing Associate +358 50 356 5566 stefan.stellato@hannessnellman.com Anniina Järvinen Partner +358 50 377 1177 anniina.jarvinen@hannessnellman.com Counsel to Terveystalo in its IPO and listing on the Nasdaq Helsinki stock exchange Parties Suomen Terveystalo Oy Transaction Terveystalo’s IPO and listing on the Nasdaq Helsinki stock exchange Deal Value The offering by the company and its shareholders was over EUR 870 million and the Company’s market value was over EUR 1.2 billion Role Counsel to Terveystalo Contacts Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Sonja Siggberg Partner +358 40 837 6967 sonja.siggberg@hannessnellman.com Anniina Järvinen Partner +358 50 377 1177 anniina.jarvinen@hannessnellman.com Antti Kuha Partner +358 40 775 7440 antti.kuha@hannessnellman.com Elina Toivakainen Counsel +358 40 594 4882 elina.toivakainen@hannessnellman.com Markus Bremer Partner +358 40 716 9676 markus.bremer@hannessnellman.com Matias Moberg Partner +358 40 867 4634 matias.moberg@hannessnellman.com Annemari Rosi Senior Associate +358 40 573 5304 annemari.rosi@hannessnellman.com Ella Mäkijärvi Senior Associate +358 44 555 7005 ella.makijarvi@hannessnellman.com Counsel to Altia Plc in the merger of Altia Plc and Arcus ASA to form Anora Group, 2021 Parties Altia Plc, Arcus ASA Transaction Merger of Altia Plc and Arcus ASA to form Anora Group Deal value Preliminary aggregated annual revenue EUR 640 million Role Lead counsel to Altia Plc Contacts Sonja Siggberg Partner +358 40 837 6967 sonja.siggberg@hannessnellman.com Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Anniina Järvinen Partner +358 50 377 1177 anniina.jarvinen@hannessnellman.com Robert Gordin Senior Associate +358 44 079 9799 robert.gordin@hannessnellman.com Mikko Huimala Partner +358 44 530 0753 mikko.huimala@hannessnellman.com Jenni Heurlin Managing Associate +358 40 825 0405 jenni.heurlin@hannessnellman.com Heikki Vesikansa Partner +358 40 844 2117 heikki.vesikansa@hannessnellman.com Isabella Kartila Senior Associate +358 44 514 3829 isabella.kartila@hannessnellman.com Markus Bremer Partner +358 40 716 9676 markus.bremer@hannessnellman.com Johanna Haltia-Tapio Specialist Partner +358 40 552 3478 johanna.haltia-tapio@hannessnellman.com Panu Siitonen Partner +358 50 547 1377 panu.siitonen@hannessnellman.com Harri Vehviläinen Specialist Partner +358 40 183 1636 harri.vehvilainen@hannessnellman.com Counsel to the Prime Minister’s Office in the Rights Offering of Finnair Plc, 2020 Comprehensive advice on the state aid law for the Prime Minister’s Office concerning the recapitalisation (rights offering) of the state-controlled airline Finnair Plc, including advise on the notification procedure before the European Commission. The rights offering of 500 MEUR is one of the largest rights offerings in Finland in recent years. The Commission’s decision in the case lead to amendments to the COVID-19 related State Aid Temporary Framework. Contacts Mikko Huimala Partner +358 44 530 0753 mikko.huimala@hannessnellman.com Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Jenni Heurlin Managing Associate +358 40 825 0405 jenni.heurlin@hannessnellman.com Antti Kuha Partner +358 40 775 7440 antti.kuha@hannessnellman.com Tommi Kovero Senior Associate +358 40 523 9292 tommi.kovero@hannessnellman.com Satu Kokko Senior Associate +358 40 838 9157 satu.kokko@hannessnellman.com Counsel to Verkkokauppa.com Oyj on its listing on the official list of Nasdaq Helsinki, 2020 Parties Verkkokauppa.com Oyj Transaction Verkkokauppa.com Oyj's listing on the official list of Nasdaq Helsinki on 5 June 2020 Deal Value Value not public Role Counsel to Verkkokauppa.com Oyj Contacts Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Anniina Järvinen Partner +358 50 377 1177 anniina.jarvinen@hannessnellman.com Elina Toivakainen Counsel +358 40 594 4882 elina.toivakainen@hannessnellman.com Robert Gordin Senior Associate +358 44 079 9799 robert.gordin@hannessnellman.com Tommi Kovero Senior Associate +358 40 523 9292 tommi.kovero@hannessnellman.com Counsel to lead manager SEB (publ.) Helsinki branch in the Robit Plc’s IPO and listing on the First North Finland Parties Robit Plc & Skandinaviska Enskilda Banken (publ.), Helsinki Branch Transaction Counsel to lead manager SEB (publ.) Helsinki branch in the Robit Plc’s IPO and listing on the First North Finland Deal Value EUR 48 million Role Counsel to the Lead Manager, Skandinaviska Enskilda Banken (publ.), Helsinki Branch Contacts Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Anniina Järvinen Partner +358 50 377 1177 anniina.jarvinen@hannessnellman.com Counsel to Asiakastieto Group Plc in its IPO and listing on the Helsinki Stock Exchange Parties Asiakastieto Group Plc Transaction Asiakastieto Group Plc’s IPO and listing on the Helsinki Stock Exchange Deal Value Approx. EUR 170 million Role Counsel to Asiakastieto Group Plc Contacts Klaus Ilmonen Partner, Doctor of Laws +358 40 831 1868 klaus.ilmonen@hannessnellman.com Sonja Siggberg Partner +358 40 837 6967 sonja.siggberg@hannessnellman.com Heikki Vesikansa Partner +358 40 844 2117 heikki.vesikansa@hannessnellman.com Anniina Järvinen Partner +358 50 377 1177 anniina.jarvinen@hannessnellman.com Show all , Load more References Rankings Hall of Fame, Capital Markets, Legal 500, 2025 Ranked in Capital Markets, Chambers Europe, 2025 Recognised as a Market Leader in Capital Markets, IFLR1000, 2024 Hall of Fame, Capital Markets, Legal 500, 2024 Ranked in Capital Markets, Chambers Global, 2025 Ranked in Capital Markets, Chambers Global, 2024 Ranked in Capital Markets, Chambers Europe, 2024 Received Defensor Legis’ Authors’ Award for his 2023 article “Yhtiö muutoksessa – yritysohjauksen politiikkaa” addressing the impact of the evolving political landscape and increased awareness of corporate externalities on corporate governance and corporate law. 'Klaus Ilmonen is described as a "very well-respected, skilful and experienced capital markets lawyer."', Capital Markets, Chambers Global 2022 "Klaus Ilmonen is the brilliant head of the practice", Capital Markets, Legal 500, 2020 Leading individual, Capital Markets, Legal 500, 2020-2022 "Clients say he has an 'encyclopedic knowledge of the issues and is very collaborative when working with the other side.'", Chambers Europe 2020 "Impeccable legal knowledge and commercial understanding.", IFLR1000, 2020 Ranked as a Market leader in Capital Markets in the 2019-2021 editions of IFLR1000 "Sources say that Klaus Ilmonen is 'responsive, pragmatic and easy to work with. He is also extremely experienced and knowledgeable so he really ticks all the boxes.' One interviewee enthuses: 'Klaus is a clear professional in all aspects: technical knowledge, commercial awareness, effectiveness and client service.'", Chambers Europe 2018 Ranked among the best lawyers in Capital Markets in the 2015-2021 editions of Chambers Europe "Klaus Ilmonen is ‘one of the few experienced lawyers in the Finnish IPO market’ ", Capital Markets, Legal 500, 2015 Ranked among the best lawyers in the 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 and 2017 editions (Helsinki: Capital Markets, Mergers and Acquisitions) of Best Lawyers® Show all , Load more rankings Memberships and Positions of Trust Professor of Practice, Hanken School of Economics Managing Director of the Mannerheim Foundation Expert Group on Securities Regulation, The Finnish Bar Association (2008–2020) Consultative Working Group on Corporate Finance, ESMA (2011–2017) Professional Background Partner, Hannes Snellman, 2007– Cleary, Gottlieb, Steen & Hamilton, London, 1999–2002 Education Doctor of Laws, University of Helsinki, 2016 Harvard Law School, Visiting Researcher, 2011–2012 LL.M. (Stone Scholar), Columbia University, 1999 Publications “The Securitisation of the Economy and Geoeconomic Risks – New Frameworks for Business”, DL 4,5 (2023) “The Evolving Corporation – The Politics of Corporate Governance”, DL 3 (2023), Defensor Legis Article Award 2023 “Corporate Governance and Accountability in an Evolving Political Environment”, European Business Law Review (2021)