Languages

English, Finnish, Swedish

Assistant

Anni Ollus

Sonja Siggberg

Partner Corporate Advisory, Capital Markets, M&A

Languages

English, Finnish, Swedish

Assistant

Anni Ollus

Sonja advises domestic and international clients on capital markets transactions, public takeovers, and other corporate transactions involving listed companies and corporate governance related matters. She has advised clients in a number of equity and debt capital market transactions, including IPOs, secondary share issues, public tender offers, private placements, share buy-backs, and bond issues along with other strategic corporate transactions, such as mergers, demergers, and cross-border conversions. Sonja is also a trusted advisor in corporate, disclosure, insider, and other corporate governance matters.

Selected References

Parties

NYAB AB, Dovre Group Plc

Transaction

NYAB AB's acquisition of Dovre Group Plc’s Norwegian consulting business and global project personnel business.

Deal Value

EUR 34 million

Role

Counsel to NYAB AB

Contacts

Parties

Sampo plc and Topdanmark A/S

Transaction

Sampo plc's recommended public exchange offer for the shares in Topdanmark A/S

Deal Value

DKK 33 billion

Role

Counsel to Sampo plc

Contacts

Parties:

Kemppi Group Oy, Kempower Corporation

Transaction:

Counsel to Kemppi Group Oy, the majority owner of Kempower Corporation, in the placing of 3.4 million shares in Kempower Corporation

Deal value:

EUR 102 million

Role:

Counsel to Kemppi Group Oy

Contacts

Hannes Snellman advises NYAB Plc on its re-domiciliation and transfer of listing from Finland to Sweden. The re-domiciliation to Sweden is planned to be executed as a cross-border conversion, pursuant to the so-called EU Mobility Directive, whereby NYAB Plc, without being dissolved or liquidated, would be converted from a Finnish to a Swedish public limited liability company with its registered office in Sweden.

Contacts

Parties:

Terveystalo Plc

Transaction: 

Counsel to Terveystalo Plc, a healthcare service provider listed on Nasdaq Helsinki, in the issue and listing of senior unsecured sustainability-linked notes. 

Value:

EUR 100 million

Role:

Counsel to Terveystalo Plc

Contacts

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

Parties:

Sega Europe Limited and SEGA Corporation (Buyers) Rovio Entertainment Corporation (Target)

Transaction:

Counsel to Sega Europe Limited and SEGA Corporation in the recommended public cash tender offer for all shares and options in Rovio Entertainment Corporation.

Deal value: 

Approximately EUR 706 million

Role:

Counsel to Sega Europe Limited and SEGA Corporation

Contacts

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

  • Mikko Tavast

    Counsel +358 44 384 4967 mikko.tavast@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

    Associate +358 40 620 7199 sofi.lehtinen@hannessnellman.com

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

    Associate +358 50 405 7168 hanna.lindberg@hannessnellman.com

  • Stefan Stellato

    Managing Associate +358 50 356 5566 stefan.stellato@hannessnellman.com

Parties 

Virala Acquisition Company Plc, Purmo Group Ltd

Transaction 

Virala Acquisition Company Plc's merger with Purmo Group Ltd.

Deal Value 

EUR 685 million

Role

Counsel to Virala Acquisition Company Plc

Contacts

Parties

Virala Acquisition Company Plc

Transaction

Hannes Snellman acted as legal counsel to Virala Acquisition Company Plc on its IPO and the listing of its Class C shares on the SPAC segment of the regulated market of Nasdaq Helsinki

Deal Value

EUR 107.5 million

Role

Counsel to Virala Acquisition Company Plc

Contacts

Parties

Faron Pharmaceuticals Ltd

Transaction

Faron Pharmaceuticals Ltd's IPO and listing on the AIM market of the London Stock Exchange as well as the preceding fundraising of approx. GBP 10 million

Deal Value

Approx. GBP 10 million

Role

Counsel to Faron Pharmaceuticals Ltd

Contacts

Parties

Vaaka Partners (Seller)

Transaction

Vaaka Partners' sale of their shares held in Musti Group Plc through an accelerated book-building process.

Deal Value

Value not public

Role

Counsel to Vaaka Partners

Contacts

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

Parties

Cramo Plc, Adapteo Plc

Transaction

Cramo’s partial demerger and listing of Adapteo on Nasdaq Stockholm

Deal Value

SEK 5.5 billion

Role

Counsel to Cramo Plc and Adapteo Plc

Contacts

Parties:

Cargotec Corporation, Konecranes Plc

Transaction:

The announced, but subsequently abandoned, merger of Cargotec and Konecranes in 2021-2022

Deal value:

Approx. EUR 2.7 billion

Role:

Counsel to Konecranes Plc

Contacts

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

Parties

Ahlstrom-Munksjö Oyj (target), a consortium consisting of Ahlström Capital, Bain Capital Private Equity, Viknum and Belgrano Inversiones (buyer)

Transaction

Recommended public cash tender offer for all shares in Ahlstrom-Munksjö Oyj by Spa Holdings 3 Oy

Deal value

Approximately EUR 2.1 billion

Role

Counsel to the consortium

Contacts

Parties

Biotie Therapies Corp.

Transaction

Public offering and listing of Biotie Therapies Corp.’s shares on the NASDAQ Global Select Market New York

Deal Value

Approx. EUR 83 million

Role

Counsel to Biotie Therapies Corp.

Contacts

Parties 

Local Tapiola Finance Ltd

Transaction

Local Tapiola Finance Ltd's issue of EUR 115,000,000 2-year senior unsecured floating rate notes

Deal Value

Value not public

Role

Counsel to Local Tapiola Finance Ltd

Contacts

Parties

The State of Finland (seller), Altia Plc (target)

Transaction

Altia Plc’s IPO and listing on the official list of Nasdaq Helsinki

Deal Value

Over EUR 270 million

Role

Counsel to Altia Plc

Contacts

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

Rankings

  • Recognised as Highly Regarded and ranked among Women Leaders in Capital Markets and M&A, IFLR1000, 2024
  • "Sonja Siggberg is very responsive and has a holistic view of matters. She is one of the few generalists in the field who can take multiples aspects from different areas of law into account. The partner in charge is always on top of things and knows what the team is working.", Capital Markets, Legal 500, 2024
  • "She has a lot of experience and her work is of excellent quality.", Capital Markets, Chambers Global 2023
  • '"She is technically good," remark interviewees.', Capital Markets, Chambers Global 2022
  • Ranked as a Highly regarded lawyer in Capital Markets and M&A in the 2021 edition of IFLR1000
  • 'Sonja Siggberg "is very proactive, hands-on and always makes me feel like I receive very practical advice which allows me to move forward," says a client. She is well known for her ECM practice, being particularly active in listings.', Capital Markets, Chambers Global and Chambers Europe, 2021
  • Ranked in Capital Markets in Chambers Europe 2020
  • 'One client highlights her technical expertise in the capital markets area.', Chambers Europe, 2019
  • 'Sources say that she is "a skilled capital markets lawyer," adding: "She is proactive and has a good, client-friendly approach."', Chambers Europe, 2018
  • Ranked in Capital Markets in the 2017 edition of Legal 500
  • Ranked as an "outstanding up and comer" in the 2017 edition (Finland: Capital Markets) of Chambers Europe
  • Described as "a very dedicated and ambitious lawyer with a deep knowledge of company law." Sources also say that she is "a good listener.", Chambers Europe, 2017
  • Ranked among the Rising stars in the 2017-2020 editions (Finland: M&A) of IFLR1000

Memberships and Positions of Trust

  • Member of the Finnish Bar Association

Professional Background

  • Partner, Hannes Snellman, 2014–
  • Managing Associate, Hannes Snellman, 2012–2013
  • Senior Associate, Hannes Snellman, 2005–2011
  • Visiting lawyer, Mannheimer Swartling, Berlin, 2003
  • Associate, Hannes Snellman, 2001–2005

Education

  • Master of Laws, University of Helsinki, 2001