People

Sonja Siggberg

Partner | Helsinki

Sonja's practice includes capital markets transactions and other transactions involving listed companies as well as corporate governance related matters. She has advised clients in a number of equity and debt capital market transactions (both domestic and international), including IPOs, secondary share issues, complex corporate transactions, public takeovers and bond issues. She is also a trusted advisor in disclosure, insider and corporate governance matters as well as other securities markets related regulatory matters.

One client highlights her technical expertise in the capital markets area.

Capital Markets | Chambers Europe 2019


References

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

Sonja Siggberg

Sonja Siggberg

Partner | Helsinki
sonja.siggberg@hannessnellman.com
Mattias Friberg

Mattias Friberg

Partner | Stockholm
mattias.friberg@hannessnellman.com
Antti Kuha

Antti Kuha

Managing Associate | Helsinki
antti.kuha@hannessnellman.com
Elina Toivakainen

Elina Toivakainen

Counsel | Helsinki
elina.toivakainen@hannessnellman.com
Henrik Hautamäki

Henrik Hautamäki

Senior Associate | Helsinki
henrik.hautamaki@hannessnellman.com
Erkko Korhonen

Erkko Korhonen

Specialist Partner | Helsinki
erkko.korhonen@hannessnellman.com
Anton Karlais

Anton Karlais

Associate | Helsinki
anton.karlais@hannessnellman.com
Linnea Lehtonen

Linnea Lehtonen

Associate | Helsinki
linnea.lehtonen@hannessnellman.com
Khaled Talayhan

Khaled Talayhan

Senior Associate | Stockholm
khaled.talayhan@hannessnellman.com
Markus Bremer

Markus Bremer

Partner | Helsinki
markus.bremer@hannessnellman.com
Janne Veneranta

Janne Veneranta

Senior Associate | Helsinki
janne.veneranta@hannessnellman.com
Stefan Stellato

Stefan Stellato

Associate | Helsinki
stefan.stellato@hannessnellman.com

Parties

Ahlstrom-Munksjö

Transaction

Ahlstrom-Munksjö's EUR 150 million rights issue to partly finance the acquisition of Expera Specialty Solutions

Deal Value

EUR 150 million

Role

Counsel to Ahlstrom-Munksjö

Sonja Siggberg

Sonja Siggberg

Partner | Helsinki
sonja.siggberg@hannessnellman.com
Anniina Järvinen

Anniina Järvinen

Managing Associate | Helsinki
anniina.jarvinen@hannessnellman.com
Annemari Rosi

Annemari Rosi

Senior Associate | Helsinki
annemari.rosi@hannessnellman.com
Elina Toivakainen

Elina Toivakainen

Counsel | Helsinki
elina.toivakainen@hannessnellman.com
Henrik Hautamäki

Henrik Hautamäki

Senior Associate | Helsinki
henrik.hautamaki@hannessnellman.com
Anton Karlais

Anton Karlais

Associate | Helsinki
anton.karlais@hannessnellman.com
Anna Sahrakorpi

Anna Sahrakorpi

Associate | Helsinki
anna.sahrakorpi@hannessnellman.com

Parties

LocalTapiola Mutual Life Insurance Company

Transaction

LocalTapiola Mutual Life Insurance Company’s issue of EUR 100 million capital notes

Deal Value

Value 100 million

Role

Counsel to LocalTapiola Mutual Life Insurance Company

Markus Bremer

Markus Bremer

Partner | Helsinki
markus.bremer@hannessnellman.com
Sonja Siggberg

Sonja Siggberg

Partner | Helsinki
sonja.siggberg@hannessnellman.com
Janne Veneranta

Janne Veneranta

Senior Associate | Helsinki
janne.veneranta@hannessnellman.com
Annemari Rosi

Annemari Rosi

Senior Associate | Helsinki
annemari.rosi@hannessnellman.com
Valerie Wårvik

Valerie Wårvik

Associate | Helsinki
valerie.warvik@hannessnellman.com

Parties

Ahlstrom-Munksjö (Buyer), Expera Specialty Solutions (Target), KPS Capital Partners (Seller)

Transaction

Ahlstrom-Munksjö’s acquisition of Expera Specialty Solutions, a U.S.-based specialty paper producer

Deal Value

USD 615 million

Role

Counsel to Ahlstrom-Munksjö

Sonja Siggberg

Sonja Siggberg

Partner | Helsinki
sonja.siggberg@hannessnellman.com
Fredrik Olsson

Fredrik Olsson

Managing Partner | Stockholm
fredrik.olsson@hannessnellman.com
Johan Aalto

Johan Aalto

Partner | Helsinki
johan.aalto@hannessnellman.com
Antti Kuha

Antti Kuha

Managing Associate | Helsinki
antti.kuha@hannessnellman.com
Anniina Järvinen

Anniina Järvinen

Managing Associate | Helsinki
anniina.jarvinen@hannessnellman.com
Albert Danielsson

Albert Danielsson

Senior Associate | Stockholm
albert.danielsson@hannessnellman.com
Henrik Hautamäki

Henrik Hautamäki

Senior Associate | Helsinki
henrik.hautamaki@hannessnellman.com
Agda Vähä-Piikkiö

Agda Vähä-Piikkiö

Associate | Helsinki
agda.vaha-piikkio@hannessnellman.com
Anton Karlais

Anton Karlais

Associate | Helsinki
anton.karlais@hannessnellman.com
Carolina Wahlby

Carolina Wahlby

Specialist Partner | Stockholm
carolina.wahlby@hannessnellman.com
Aina Renström

Aina Renström

Senior Associate | Stockholm
aina.renstrom@hannessnellman.com

Parties

YIT Oyj

Transaction

Issue of EUR 100 million and EUR 150 million senior notes by YIT Oyj

Deal Value

EUR 250 million

Role

Counsel to YIT Oyj

Markus Bremer

Markus Bremer

Partner | Helsinki
markus.bremer@hannessnellman.com
Janne Veneranta

Janne Veneranta

Senior Associate | Helsinki
janne.veneranta@hannessnellman.com
Sonja Siggberg

Sonja Siggberg

Partner | Helsinki
sonja.siggberg@hannessnellman.com

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

Sonja Siggberg

Sonja Siggberg

Partner | Helsinki
sonja.siggberg@hannessnellman.com
Markus Bremer

Markus Bremer

Partner | Helsinki
markus.bremer@hannessnellman.com
Anniina Järvinen

Anniina Järvinen

Managing Associate | Helsinki
anniina.jarvinen@hannessnellman.com
Annemari Rosi

Annemari Rosi

Senior Associate | Helsinki
annemari.rosi@hannessnellman.com
Lauri Marjamäki

Lauri Marjamäki

Associate | Helsinki
lauri.marjamaki@hannessnellman.com
Iiris Ikkelä

Iiris Ikkelä

Associate | Stockholm
iiris.ikkela@hannessnellman.com
Matias Moberg

Matias Moberg

Associate | Helsinki
matias.moberg@hannessnellman.com
Anna Räty

Anna Räty

Associate | Helsinki
anna.raty@hannessnellman.com

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

Klaus Ilmonen

Klaus Ilmonen

Partner, Doctor of Laws | Helsinki
klaus.ilmonen@hannessnellman.com
Sten Olsson

Sten Olsson

Partner | Helsinki
sten.olsson@hannessnellman.com
Sonja Siggberg

Sonja Siggberg

Partner | Helsinki
sonja.siggberg@hannessnellman.com
Anniina Järvinen

Anniina Järvinen

Managing Associate | Helsinki
anniina.jarvinen@hannessnellman.com
Antti Kuha

Antti Kuha

Managing Associate | Helsinki
antti.kuha@hannessnellman.com
Henrik Hautamäki

Henrik Hautamäki

Senior Associate | Helsinki
henrik.hautamaki@hannessnellman.com
Ella Hiltunen

Ella Hiltunen

Associate | Helsinki
ella.hiltunen@hannessnellman.com
Lauri Marjamäki

Lauri Marjamäki

Associate | Helsinki
lauri.marjamaki@hannessnellman.com
Anna Sahrakorpi

Anna Sahrakorpi

Associate | Helsinki
anna.sahrakorpi@hannessnellman.com
Elina Toivakainen

Elina Toivakainen

Counsel | Helsinki
elina.toivakainen@hannessnellman.com
Markus Bremer

Markus Bremer

Partner | Helsinki
markus.bremer@hannessnellman.com
Outi Raitasuo

Outi Raitasuo

Partner | Helsinki
outi.raitasuo@hannessnellman.com
Matias Moberg

Matias Moberg

Associate | Helsinki
matias.moberg@hannessnellman.com
Annemari Rosi

Annemari Rosi

Senior Associate | Helsinki
annemari.rosi@hannessnellman.com
Erkko Korhonen

Erkko Korhonen

Specialist Partner | Helsinki
erkko.korhonen@hannessnellman.com
Olli-Pekka Veranen

Olli-Pekka Veranen

Specialist Partner | Helsinki
olli-pekka.veranen@hannessnellman.com

Parties

Lemminkäinen Corporation and YIT Corporation

Transaction

The combination of Lemminkäinen Corporation and YIT Corporation through a statutory merger

Deal Value

EUR 771 million

Role

Counsel to Lemminkäinen

Sonja Siggberg

Sonja Siggberg

Partner | Helsinki
sonja.siggberg@hannessnellman.com
Mikko Heinonen

Mikko Heinonen

Senior Partner | Helsinki
mikko.heinonen@hannessnellman.com
Markus Bremer

Markus Bremer

Partner | Helsinki
markus.bremer@hannessnellman.com
Heikki Vesikansa

Heikki Vesikansa

Partner | Helsinki
heikki.vesikansa@hannessnellman.com
Johanna Haltia-Tapio

Johanna Haltia-Tapio

Specialist Partner | Helsinki
johanna.haltia-tapio@hannessnellman.com
Elina Toivakainen

Elina Toivakainen

Counsel | Helsinki
elina.toivakainen@hannessnellman.com
Laura Tavakka

Laura Tavakka

Senior Associate | Helsinki
laura.tavakka@hannessnellman.com
Heikki Majamaa

Heikki Majamaa

Counsel | Helsinki
heikki.majamaa@hannessnellman.com
Jesper Kostiainen

Jesper Kostiainen

Managing Associate | Helsinki
jesper.kostiainen@hannessnellman.com
Harri Vehviläinen

Harri Vehviläinen

Counsel | Helsinki
harri.vehvilainen@hannessnellman.com
Jenni Heurlin

Jenni Heurlin

Associate | Helsinki
jenni.heurlin@hannessnellman.com
Stefan Stellato

Stefan Stellato

Associate | Helsinki
stefan.stellato@hannessnellman.com

Parties

Ahlstrom Oyj, Munksjö Oyj

Transaction

The combination of Ahlstrom and Munksjö through a merger

Deal Value

Approx. EUR 1,2 billion

Role

Lead counsel to Ahlstrom

Johan Aalto

Johan Aalto

Partner | Helsinki
johan.aalto@hannessnellman.com
Sonja Siggberg

Sonja Siggberg

Partner | Helsinki
sonja.siggberg@hannessnellman.com
Antti Kuha

Antti Kuha

Managing Associate | Helsinki
antti.kuha@hannessnellman.com
Heikki Vesikansa

Heikki Vesikansa

Partner | Helsinki
heikki.vesikansa@hannessnellman.com
Henrik Hautamäki

Henrik Hautamäki

Senior Associate | Helsinki
henrik.hautamaki@hannessnellman.com
Janne Veneranta

Janne Veneranta

Senior Associate | Helsinki
janne.veneranta@hannessnellman.com
Johanna Haltia-Tapio

Johanna Haltia-Tapio

Specialist Partner | Helsinki
johanna.haltia-tapio@hannessnellman.com
Annemari Rosi

Annemari Rosi

Senior Associate | Helsinki
annemari.rosi@hannessnellman.com
Stefan Stellato

Stefan Stellato

Associate | Helsinki
stefan.stellato@hannessnellman.com

Parties

Sampo plc (Buyer), Topdanmark A/S (Target)

Transaction

Sampo plc’s mandatory public cash offer for all outstanding shares in Topdanmark A/S

Deal Value

Value not public

Role

Counsel to Sampo plc

Johan Aalto

Johan Aalto

Partner | Helsinki
johan.aalto@hannessnellman.com
Sonja Siggberg

Sonja Siggberg

Partner | Helsinki
sonja.siggberg@hannessnellman.com

Parties

Acorda Therapeutics (Bidder), Biotie Therapies (Target)

Transaction

Acorda Therapeutics' public tender offer of the shares and other securities in Biotie Therapies

Deal Value

USD 363 million

Role

Counsel to Biotie Therapies Corp.

Mikko Heinonen

Mikko Heinonen

Senior Partner | Helsinki
mikko.heinonen@hannessnellman.com
Klaus Ilmonen

Klaus Ilmonen

Partner, Doctor of Laws | Helsinki
klaus.ilmonen@hannessnellman.com
Elina Toivakainen

Elina Toivakainen

Counsel | Helsinki
elina.toivakainen@hannessnellman.com
Henrik Hautamäki

Henrik Hautamäki

Senior Associate | Helsinki
henrik.hautamaki@hannessnellman.com
Heikki Vesikansa

Heikki Vesikansa

Partner | Helsinki
heikki.vesikansa@hannessnellman.com
Anna-Maria Tamminen

Anna-Maria Tamminen

Partner | Helsinki
anna-maria.tamminen@hannessnellman.com
Sonja Siggberg

Sonja Siggberg

Partner | Helsinki
sonja.siggberg@hannessnellman.com

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

Sonja Siggberg

Sonja Siggberg

Partner | Helsinki
sonja.siggberg@hannessnellman.com
Heikki Vesikansa

Heikki Vesikansa

Partner | Helsinki
heikki.vesikansa@hannessnellman.com
Anniina Järvinen

Anniina Järvinen

Managing Associate | Helsinki
anniina.jarvinen@hannessnellman.com
Emilia Uusitalo

Emilia Uusitalo

Senior Associate | Helsinki
emilia.uusitalo@hannessnellman.com

Parties

Biotie Therapies Corp.

Transaction

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

Deal Value

Approx. EUR 83 million

Role

Counsel to Biotie Therapies Corp.

Sonja Siggberg

Sonja Siggberg

Partner | Helsinki
sonja.siggberg@hannessnellman.com
Mikko Heinonen

Mikko Heinonen

Senior Partner | Helsinki
mikko.heinonen@hannessnellman.com
Antti Kuha

Antti Kuha

Managing Associate | Helsinki
antti.kuha@hannessnellman.com
Henrik Hautamäki

Henrik Hautamäki

Senior Associate | Helsinki
henrik.hautamaki@hannessnellman.com

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

Klaus Ilmonen

Klaus Ilmonen

Partner, Doctor of Laws | Helsinki
klaus.ilmonen@hannessnellman.com
Sonja Siggberg

Sonja Siggberg

Partner | Helsinki
sonja.siggberg@hannessnellman.com
Heikki Vesikansa

Heikki Vesikansa

Partner | Helsinki
heikki.vesikansa@hannessnellman.com
Anniina Järvinen

Anniina Järvinen

Managing Associate | Helsinki
anniina.jarvinen@hannessnellman.com

Rankings

  • 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, 2005

Education and 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
  • Master of Laws, University of Helsinki, 2001