CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k. > Warsaw, Poland > Firm Profile

CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k.
00-113 WARSAW

Poland > Competition/antitrust Tier 1

CMS Cameron McKenna Nabarro Olswang Pośniak i Bejm sp.k.‘s competition practice sits within the firm’s global and EU competition group, advising on the whole spectrum of matters, including merger control, antitrust compliance, investigations, unfair competition and consumer protection as well as state aid and public procurement. The team also represents clients in proceedings concerning alleged anti-competitive behaviour before the Polish Competition Authority and the competition courts. Competition expert Małgorzata Urbańska heads up the group as well as leading the firm’s consumer products sector focus practice in Central  and Eastern Europe. Senior associates Agnieszka Starzyńska and Izabela Biernat-Sadlak are also notable team members.

Practice head(s):


‘A very dedicated team, meaning that CMS is always available for us in any form and any time and very experienced members, knowing latest local practice of the authority as well as European trends. CMS has expertise in many European markets, that makes CMS an excellent partner in international projects.’

‘It is an excellent team, incredibly strong in competition matters. It has brilliant specialists with extensive legal knowledge, real in-depth expertise and experience. The team is very dedicated and committed to producing the best results for you. They work extremely well together, you have a feeling that you get advice from a team rather than individual lawyers. They are practical in their advice and also understand our objectives and business dynamics. We would not seek competition law advisory elsewhere – CMS Poland delivers it exceptionally well.’

‘Malgorzata Urbanska, the head of the competition team in Poland, is a top-class lawyer who is great to work with. She is an absolute expert in antitrust and combines competition law expertise with an excellent business understanding. She has the rare ability to provide the right combination of strategic sophisticated advice and pragmatic execution. Her best attribute is exceptional client care, she is there for you and with you to solve your problem with a lot of commitment and own initiative.’

‘CMS has huge diversity and is able to cover a lot of areas. Their advice is concise and to the point, yet very comprehensive. They have really high expertise and they are business-oriented and very practical (rather than purely theoretical).’

‘Malgorzata Urbanska has good engagement and knowledge. Izabela Biernat-Sadlak has built a dossier of knowledge. Krzysztof Sikora has good experience with governmental institutions.’

‘Izabela Biernat-Sadlak provided great assistance, proactively reaching out to help in the ongoing matters and more significant projects. Her understanding of the business and the ability to address the underlying commercial and legal issues are definitely worth calling out.’

‘Izabela Biernat-Sadlak is an excellent antitrust lawyer. She is very experienced, incredibly knowledgeable, and delivers very high-quality work. She has a great ability to provide guidance that is specific, well-thought through and practical. She is energetic, business-oriented, and provides very good client care.’

‘My main point of contact in the team is Izabela Biernat-Sadlak. Izabela is great to work with, she is engaged and very responsive, pro-active in looking for tailored solutions.’

Key clients

Bombardier Transportation

Van Tilburg-Bastianen Group

TB Truck & Trailer Service Sp. z o.o.


Groupe CAT

Plansee Holding AG

PZ Cussons

Bayerische Motoren Werke AG


Panattoni Development



CooperVision Poland



Bausch Health



Work highlights

  • Advising CooperVision Poland on competition and consumer protection issues relating to its day-to-day activities on the Polish market.
  • Advising Van Tilburg-Bastianen Group, as well as its Polish subsidiary TB Truck & Trailer Service, in a cartel case conducted by the Polish Competition Authority against four DAF dealers in Poland.
  • Advising Vattenfall AB on securing merger clearance for establishing joint ventures with Synthos in the Polish off-shore wind farms sector.

Poland > Construction Tier 1

CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k. has a sizeable construction team that acts for insurance companies and pension and property funds on a wide range of development projects. The team handles asset management for retailers, occupiers and developers of commercial, office and warehouse spaces as well as investments, transactions, project development and execution. Contentious matters are also within the group’s remit. Lidia Dziurzyńska-Leipert  leads the team and has expertise in both private sector and public procurement sector projects, and investment law specialist Michał Bork is also a name of note.


‘The lawyer working for us has very good experience in the railway market and public contracts. He has great experience in the issues related to the contract conditions, annexes and variation orders and is very good in the legal analysis of existing situation on the job site and consequences.’

‘Very good practice in the field of construction and a readiness to work under challenging time frames and pressure.’

‘The team has a practical, creative approach that helps to solve a problem and meet business goals.’

‘I work with Piotr Stenko, Senior Associate, on a day-to-day basis – he understands the business needs of the client, knows the sector well and his advice is always on point and on time. He has wide experience in dispute resolutions.’

Key clients



Max Bögl




GMP Architekten / SBP

SBP schlaich bergermann partner


TR Warszawa

Allianz Real Estate

Construcciones Rubau, Rubau Polska, Obras y Servicios Copasa

Max Boegl

Bankruptcy receiver of Alpine Bau Deutschland AG

CDM Smith

Work highlights

  • Advising TR Warszawa on a multimillion project concerning the construction of the new buildings of Warsaw’s Museum of Modern Art and TR Warszawa Theatre on Defilad Square in Warsaw.
  • Represented the Consortium of Max Bögl Stiftung & Co. KG and Max Bögl Polska in a dispute regarding the construction of the City Stadium in Wrocław for Euro 2012.
  • Advising and representing the Consortium of Trakcja S.A. and Przedsiębiorstwo Napraw i Utrzymania Infrastruktury Kolejowej w Krakowie sp. z o.o, the general contractor for the modernisation of the E30 / C-E30 railway line Kraków – Medyka – state border, section Podłęże – Bochnia from km 16,000 to 39,000.

Poland > Dispute resolution Tier 1

CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k. ‘has one of the leading dispute resolution teams, which stands out thanks to the breadth of its international experience‘. The group has a particularly impressive offering for financial and construction sector disputes, although the team also includes experts able to cover contentious issues arising from the energy, aviation, healthcare and TMT industries. Arbitration is another key area for the firm. White-collar criminal defence is led by Arkadiusz Korzeniewski. Anna Cudna-Wagner is increasingly known for banking disputes. Counsel Katarzyna Kucharczyk is building a solid construction disputes practice.

Practice head(s):

Anna Cudna-Wagner

Other key lawyers:

Arkadiusz Korzeniewski; Katarzyna Kucharczyk; Joanna Młot; Adam Jodkowski; Julia Dyras


‘The legal services provided remain at the highest level of merit, thus taking into account business needs. Deep analysis of the problem and at the same time quick reaction and excellent contact.’

‘CMS’ team is efficient and professional.’

‘The lawyers of CMS demonstrate excellent knowledge of the legal stipulations, understanding of issues relevant to construction-related disputes and understanding of complex technological processes.’

‘Adam Jodkowski’s calmness, composure and the ability to present arguments are always impressive. I appreciate his ability to properly balance pros and cons, to suggest the best solution from the business point of view.’

‘Highly competent professionals, as a client I feel informed about current developments in our cases, each step taken and possible outcome. Very friendly and easy contact with the lawyers.’

‘In my view Malgorzata Surdek is one of the best international arbitration specialists in Poland. Highly competent and professional when conducting proceedings.’

‘CMS in Poland currently has one of the leading dispute resolution teams, which stands out thanks to the breadth of its international experience.’

‘Małgorzata Surdek is a class-act. She has breadth of experience and her own style.’

Key clients

Mammoet Poland


Bank Handlowy w Warszawie (Citibank Group)

Bank Ochrony Środowiska

Bombardier Transportation

BPH Bank (GE Group)


mBank (Commerzbank Group)

Millennium Bank (BCP Group)

Mostostal Warszawa (Acciona Group)

PKO Bank (the biggest retailer’s bank in Poland)

Polskie Koleje Linowe (PKL)

Schuler Group (Andritz Group)



VIG Makina

Work highlights

  • Representing mBank in 4 cartel-related cases initiated by 4 different claimants – the matter exceeds EUR 200 million.
  • Representing Schuler Poland and advising Schuler Pressen in a EUR 30 million cross-border multi-disciplinary litigation in the automotive industry regarding liability for damages resulting from the breakdown of a car press line installed in the Opel car manufacturing plant in south-western Poland.
  • Representing Mostostal Warszawa in two proceedings related to the construction of a bio-mass energy plant in Elbląg and in two court disputes related to the construction of a waste incineration plant in Szczecin.

Poland > Employment Tier 1

CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k. is instructed on trade union negotiations, immigration-related issues and sensitive internal HR investigations, leveraging its international network to support on an array of domestic and multinational mandates. The team also assists clients in setting up pension schemes and routinely handles regulatory matters regarding salaries in the financial services sector. Katarzyna Dulewicz heads the department and is supported by senior associates Maciej Andrzejewski and Agnieszka Kałwa, as well as counsel Tomasz Sancewicz .

Practice head(s):


‘Good commercial advice, good value on rates and know our business well.’

‘ I always appreciate the support provided by CMS, containing not only information about law regulations but also advice concerning possible solutions and risks combined to them.’

‘The advice provided by them is always detailed, on time, containing proper interpretation.’

‘Tomasz Sanciewicz has a very commercial practice, does not sit on the fence, knows our business and is very responsive.’

Key clients

Primark Limited

Coty, Inc.

ZTE Corporation




Ringier Axel Springer

Alvogen Pharma Sp.

Honeywell Services

British Telecom

Bank Polska Kasa Opieki SA


Vistra International


Equiniti Limited

Motorex AG

Korn Ferry

Universal Music

Warner Media

Becton Dickinson

Pharmaceutical Restructuring International

Atlantia S.p.A.

Partner in Pet Food



Grupa Azoty

Zensar Technologie

Jamf Software



Work highlights

  • Advised Coty on an outsourcing deal from Coty to Accenture.
  • Assisted Honeywell with implementing new HR software – time and attendance system.
  • Advising TJX on Covid related topics during shops’ closure.

Poland > Energy and natural resources Tier 1

The energy and projects department at CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k. is led by Marcin Bejm and benefits from the international nature of the firm, allowing the team to coordinate with other offices across Europe. The team handles transactions and projects in a number of sub-sectors including chemical, petrochemical, metallurgical and mining. The practice frequently supports clients in the exploration for, and production of, energy resources and minerals and also excels in respect of energy-related M&A, regulatory matters, industrial investment processes and environmental impact assessments. Also of note are head of the oil and gas sector team Tomasz Minkiewicz, Łukasz Szatkowski, who thrives in advising international and Polish investors, regulatory expert Piotr Ciołkowski and head of the environmental law practice Agnieszka Skorupińska.

Practice head(s):


‘I believe they are the most professional and have the largest know-how in the Polish energy market. they have a big team, so their availability is amazing, and they also do many introductions to help our business.’

‘Their assistance is not purely legal but also very commercial, they have a great approach to clients and make us feel we are the number one client, and they ate not just responsive but also active, which is very important when you have many balls in the air.’

‘We have worked with CMS Warsaw on many transactions over the last 3 years. They are our go-to firm in Poland, heads and shoulders above their competitors in terms of depth of expertise, responsiveness, drafting, problem solving and commerciality.’

‘Special appreciation for the experience and knowledge of Mr. Maciej Ziółkowski who has substantive knowledge and experience, an individual approach to the client, and above all, a proactive attitude.’

‘Maciej Ziółkowski has always presented diligence and very high quality in all the work for us. I regard him as a tremendously good energy advisor and lawyer who combines legal and business advisory. He keeps things straight and to-the-point and is very effective. Maciej always provides us with a comprehensive and competent advisory concerning various aspects of the investment process. He is super pragmatic, timely and helpful and we can rely on his advice which often gives us better understanding of Polish regulations.’

‘Agnieszka Skorupińska, has, above all, a very, very strong commitment to getting the job done. She is open to ideas, open minded and also very practical. Great personality, perfectly able to explain and convey the knowledge she has.’

‘Lukasz Szatkowski and Angelika Szufel are outstanding professionals with an outstanding knowleadge about the energy sector.’

‘Consistently strong performance from Piotr Ciolkowski and team are more responsive and proactive than some of the competitors.’

Key clients

PKN Orlen SA


Grupa Azoty SA





Polskie Sieci Elektroenergetyczne SA

Rafako SA

EuRoPol Gaz SA

Polish Development Fund

Fortum Power and Heat Poland

CalEnergy Resources

Central European Petroleum

Rathdowney Resources

Stadtwerke München GmbH

Macquarie Capital

Green Investment Group

MEAG MUNICH ERGO Assetmanagement

ČEZ Group


Koehler Renewable Energy

Nala Renewables Switzerland Sàrl

BayWa r.e. renewable energy

Solarpro Holding PLC

Acciona Energy

Doral Group Renewable Energy Resources Ltd

Afcon Renewable Energy Ltd

SINO-CEEF Capital Management Company Ltd

Eolus Vind AB


ib vogt GmbH

CEE Equity Partners

Corinth Pipeworks SA

Lubelski Wegiel BOGDANKA


Work highlights

  • Advising Equinor on the purchase of Wento from private equity fund Enterprise Investors.
  • Advising longstanding client Macquarie’s Green Investment Group on the acquisition of a 25.3 MW operating onshore wind farm in Jozwin, located in western Poland, from Vortex Energy Poland and Max Bögl International SE.
  • Advising PKN ORLEN on the construction of the PLN 13.5bn Olefins III petrochemical complex.

Poland > Insurance Tier 1

CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k.‘s financial services and institutions team is led by Ewa Świderska, and the department is praised for its ‘great knowledge, deep understanding of the market and client needs.’ The practice advises domestic and international insurance stakeholders on a broad range of contentious and non-contentious matters including M&A transactions and regulatory mandates. The group also acts for financial institutions on consumer protection issues, representing clients before the Polish consumer protection authority. Senior associate Adam Jodkowski is also a name of note.

Practice head(s):


‘Great knowledge, deep understanding of the market and client needs and focused on solutions.’

‘The company is experienced in mergers and transformations of insurance companies.’

‘Fast response and on going contact during the case which helps to keep the issue under control, as well as good cooperation and quite often proposing alternative solutions.’

‘We worked with Mrs. Ewa Świderska, who coordinated the project with the satisfactory result and Ms. Sylwia Raszplewicz- Czyżewska who supported the projects and we are happy about the cooperation.’

Key clients


Bank Millennium

Credit Agricole Life Insurance Europe



PIB Group Limited


Work highlights

  • Assisted Generali group with the merger of Generali Polish life and non-life companies with, accordingly, Concordia life and non-life companies, and the successful transformation of a mutual insurance company, Concordia Non-Life, into a joint-stock company.
  • Advised Credit Agricole Life Insurance Europe on the regulatory, commercial, and tax aspects related to the intra-group transfer of the insurance portfolio of its Polish branch to the newly established Polish insurance company within Credit Agricole Group and the intra-group transfer of the remaining assets of that branch, as well as advising on the liquidation of the above-mentioned Polish branch.
  • Advised Qover (InsurTech) on some aspects of cooperation with Revolut in relation to embedded insurance supporting Revolut clients in their day-to-day operations.

Poland > Investment funds Tier 1

For CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k., investment funds are a core competency, bringing together lawyers from across the firm to provide a well-rounded service that includes corporate, tax, projects and finance experts. The group is regularly instructed on fund structuring, establishment and liquidation and fund combinations. It also has a strong regulatory offering, as well as services geared towards fund managers. Błażej Zagórski is the key contact and is particularly known for assisting German-speaking clients with investment projects and corporate governance matters in Poland. He is also experienced in green investment. Marcin Bejm takes the lead on infrastructure and project funds, while Piotr Ciołkowski handles the regulatory side of energy-related fund issues. Senior associate Rafał Dostatni contributes to the tax piece.

Practice head(s):

Błażej Zagórski

Other key lawyers:

Marcin Bejm; Rafał Zwierz; Piotr Ciołkowski


‘Great service committed team, speedy advice whilst not compromising on quality.’

Key clients

Polish Development Fund S.A. (Polski Fundusz Rozwoju S.A.)

PFR Ventures


Macquarie’s Green Investment Group

mAccelerator and its portfolio funds


Amundi Immobilier

PFR Nieruchomości

CEE Equity Partners

Abris Capital Partners

Montagu Private Equity

The Apax’s PIB Group Limited

Advent International

Mid Europa Partners


Innova Capital


Work highlights

  • Advised PFR Ventures on its investment in three private equity funds: British Apax Partners, French PAI Partners, and Avallon MBO (a Polish fund).
  • Advised InPost, a leading e-commerce enablement platform, and its majority shareholder private equity fund Advent International, on InPost’s first public offering and listing on the Euronext Amsterdam Stock Exchange.
  • Advised Macquarie’s Green Investment Group on the acquisition of the company Future Energy sp. z o.o., the owner of a 25.3 MV onshore wind farm in Jozwin in western Poland, from MAX BÖGL INTERNATIONAL SE and Vortex Energy Poland.

Poland > Public procurement Tier 1

The public procurement department at CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k. is led by Małgorzata Urbańska, who has expertise in the competition elements of tender procedures. The team is adept at providing public procurement advice on a domestic and EU level to both contracting authorities and contractors throughout the whole spectrum of the tender process. This includes the competition-related aspects of consortia forming, drafting public procurement contracts and advising on public projects. Urbańska is supported by senior associates Krzysztof Sikora and Izabela Biernat-Sadlak, and Marcin Bejm is notable in infrastructure and energy matters.

Practice head(s):


‘This Law firm provides comprehensive and business orientated legal advice.’

‘Very hands-on approach with an ability to staff the projects efficiently and in a flexible way.’

‘Besides their profound knowledge in the field of public procurement law, the team is very well organised, reachable and work is always client-oriented. It was a pleasure to work with them on our case.’

‘Marcin Bejm has in-depth knowledge of the public procurement law and local regulations, high engagement in day to day project work and good availability to respond quickly to changing transaction dynamics.’

‘Both the Partner Małgorzata Urbańska as well as the Senior Associate Krzysztof Sikora are very experienced and competent lawyers in the field of public procurement law. It was a pleasure to discuss our issues with them and we valued their contribution and their working spirit (always efficient, focused on the legal issue, pleasant, client-oriented and precise).’

‘Mrs. Małgorzata Urbańska has comprehensive knowledge and excellent analytical and communication skills.’

Key clients

European Investment Bank


PZU Group

Bank Pekao SA

Warbud SA

Budimex SA

Pojazdy Szynowe PESA Bydgoszcz SA

Centralny Port Komunikacyjny sp. z o.o.

Incheon Airport in Seoul

Polskie Sieci Elektroenergetyczne S.A.

Local Government Investment Fund

Górnośląskie Towarzystwo Lotnicze SA

CalEnergy Resources

Polska Grupa Lotnicza SA

Vamed Group

BaltCap Fund



Corinth Pipeworks


Work highlights

  • Advised Pojazdy Szynowe Pesa Bydgoszcz SA on strategic public procurement agreements and various remedies depending on the stage of realisation of specific contracts regarding rolling stock with contractors located both in Poland and various European countries.
  • Advised Incheon International Airport on negotiations of a contract for the provision of the strategic adviser services for Centralny Port Komunikacyjny sp. z o.o., which included reviewing public contracts, supporting the client during the competitive dialogue, and representing the client before the National Appeals Chamber.
  • Supported Corinth Pipeworks in its participation in a major tender organised by GAZ-SYSTEM.

Poland > Real estate Tier 1

The real estate team at CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k. has undergone significant changes through the arrival of a number of new lawyers. Practice head Agata Jurek-ZbrojskaMałgorzata Madej-Balcerowska and Dominik Rafałko joined the team from Greenberg Traurig Nowakowska-Zimoch Wysokinski Sp. k meanwhile Michał Mieciński arrived from Linklaters. The team advises a wide range of clients on development projects, including insurance companies, pension funds, property companies, commercial and residential developers and retailers. Lidia Dziurzyńska-Leipert is also noted for her experience acting for real estate institutional investors and handling construction projects in the private and public sectors.

Practice head(s):


‘CMS Warsaw has been very helpful in advising on all aspects related to our real estate projects and properties in Poland, and on M&A transactions related to real estate. Their service was top-notch professional, solution-oriented and cost-efficient.’

‘The quality of work is always to the highest standard and meets all expectations. The team is always capable to handle even very complex issues and ready to deliver solutions on time and they are very creative in their approach to every task. The company is billing reasonable fees, which reflect the real engagement, which is not a standard compared with some competitors.’

‘Lidia Dziurzyńska-Leipert is very professional, practical and business-oriented and Michal Bork is a top-notch real estate law expert. Together, they formed a very strong team and are able to carry-out complex transactions.’

‘I usually work with Lidia Dziurzyńska-Leipert who is always very committed, I can trust her on every task, that it will be handled with high priority and every issue will be resolved in a most advantageous way for our company. Very good communication with Lidia makes the cooperation smooth and really supportive in sometimes really complex issues.’

Key clients

Aberdeen Standard

AFI Europe

Alkyon Partner Development

Allianz Real Estate



Corum XL

FM Logistic




Motel One




REInvest Asset Management


TR Warszawa

Work highlights

  • Advised AFI Properties on the acquisition and financing of a T-Mobile office building located in Warsaw at Marynarska 12 Street from Starwood Capital Group.
  • Advised Amundi Real Estate on the acquisition of Nowogrodzka Square and the Neopark office complexes in Warsaw.
  • Advised REICO on the acquisition of a warehouse development, Panattoni Park Tychy DC 1 from JV partners from Panattoni and Bluehouse.

Poland > Tax Tier 1

According to one client, the team at CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k. is ‘brilliant'; from 'start to finish, on every project they are responsive, commercial and diligent'. The team handles the full spectrum of tax issues for clients operating in energy, chemicals, finance, insurance, consumer products, real estate and manufacturing, sectors of particular focus and specialism for the firm. In an illustration of its strong reputation in the market, in 2021, the group advised InPost on the tax aspects of its IPO on the Euronext Amsterdam exchange. Heading the department is Andrzej Pośniak, who is an accomplished transactional tax lawyer. Clients single out counsel Małgorzata Brauckmann-Sajkiewicz for particular praise, citing her ‘top-class' expertise in tax planning and restructuring. Senior associate Paulina Karpińska-Huzior is praised as ‘a stronghold in negotiations', and is an expert in tax disputes, with experience in proceedings before the Polish authorities and administrative courts.

Practice head(s):

Andrzej Pośniak


‘This team is brilliant; start to finish on every project they are responsive, commercial and diligent.’

‘Andrzej Posniak is always available and provides clear, commercial advice.’

‘I have been working with Małgorzata Brauckmann-Sajkiewicz for years: professional, fast and extremely competent and trustworthy.’

‘A very professional and committed team that carries out the entrusted orders on time and faultlessly.’

‘Małgorzata Brauckmann-Sajkiewicz is a top-class expert in tax planning and restructuring. She is our go-to lawyer in CMS. Out of the box thinker – provided tax effective solutions in cases which seemed to be lost. She has very strong business acumen and really understands our business goals. Very committed, optimistic personality. I would work with her again.’

‘CMS team in Poland provides the highest competence in tax practice combined with hard working people able to adopt to changing situations. In depth knowledge, big team to consult other issues and personal involvement of key people is the base for our successful cooperation.’

‘CMS Poland is, as per my experience, the best tax firm for M&A transactions in Poland, with a great team, very dedicated and competent.’

‘We are primarily working together with Paulina Karpińska-Huzior working in the team of Andrzej Posniak. They are very smart and efficient, they work very well together. They focus on finding solutions and getting the deal done and not making it complicated.’

Key clients

Grupa Azoty


Advent International

Polski Fundusz Rozwoju


Macquarie’s Group – Green Investment Group

Amundi Immobilier

Montagu Private Equity

Corum XL

Grupo Lar

PFR Ventures

Work highlights

  • Advised InPost and its majority shareholder private equity fund Advent International on tax aspects of the management incentive plan related to InPost’s listing on the Euronext Amsterdam Stock Exchange.
  • Advised Grupa Azoty on tax aspects of a major investment in the chemical industry in CEE, with an estimated budget of €1.5bn.
  • Advised PFR Ventures on its international investment in three private equity funds; British Apax Partners, French PAI Partners, and Avallon MBO (a Polish fund).

Poland > TMT Tier 1

CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k. stands out for its significant experience advising on the implementation of IT systems and related disputes arising from IT agreements, where it advises major international digital businesses and TMT clients, including fintech companies and investors. Other capabilities of the group include advising on telecoms regulation, network sharing, and newer technologies such as new fibre and 5G networks. Technology, media and data privacy law expert Tomasz Koryzma is head of the practice. Damian Karwala is another name to note.

Practice head(s):

Other key lawyers:


‘Responsive. Highly competent on regulatory issues. Very familiar with our business and thus a great partner to our company.’

‘Reliable. They know our business and contractual structure very well. They have been successful to build a highly collaborative partnership.’

‘In the context of a very complex legal dispute, the partner and team presents consistency in planning, presenting and negotiating agreed with client positions, which give the client great confidence in the assessment of potential impact to running business.’

‘Tomasz Kozyzma is a great team leader, he has managed to set up a team of individuals who are ready for hard work and effective cooperation, supported by unique knowledge related to business cases, which make business much better prepared for critical decisions.’

‘Mr Karwala has excellent knowledge in the area of data privacy.’

‘Damian Karwala is very committed and reliable, with business understanding, strong expertise in technology, IT, data privacy.’

Key clients


Apo Discounter



Gerber Technology



Work highlights

  • Assisting Airbnb on a comprehensive assessment of the legal framework applicable to the client’s business in Poland.
  • Advising Apo Discounter on its Polish platform offering online pharmaceutical products, food products and dietary supplements.
  • Advising Prudential Poland in relation to IT and cloud computing services.

Poland > White-collar crime Tier 1

CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k. advises clients in the financial services, life sciences, energy, environment, construction and infrastructure sectors on a wide range of business-related criminal law. This includes both domestic and cross-border anti-bribery and corruption issues, anti-money laundering and connected criminal proceedings. The team also supports clients during forensic investigations, as well as on compliance and ethical issues. Arkadiusz Korzeniewski heads up the practice and is praised by clients as 'one of the top lawyers' in this field. He also leads the CEE corporate crime group. Senior associates Maciej Kópczyński and Mariusz Minkiewicz are also names to note.

Practice head(s):


‘Approachable and professional partners. In depth knowledge and understanding of the business environment. Open and trustful cooperation.’

‘The practice is unique for its professional team and creative legal precedence and achievements. They always return with the right answer and solve problems.’

‘The first and most important thing is that the Team has wide extensive experience in specific matters, it creates comfort in discussions and improves the communication and collaboration.’

‘One of the first and one of the leading White-collar crime practices in the country. Agile and persistent.’

‘Arkadiusz Korzeniewski is always available, always ready, always insightful. Mariusz Minkiewicz is thorough and calm. Maciej Kopczynski is innovative.’

‘Arkadiusz Korzeniewski showed an extraordinary understanding of the subject, was flexible, accessible and the subject was taken care of.’

‘Our company cooperates with Arkadiusz Korzeniewski, and his high standards of personal culture, competences and approach to clients makes the cooperation effective and pleasant.’

‘Arkadiusz Korzeniewski is one of the top lawyers; he has expertise in legal knowledge and works with all his heart and spirit. He is special because he will not stop until he will achieve the goal.’

Poland > Banking and finance Tier 2

The banking and finance group at CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k. acts for Polish and international banks, financial institutions and high-profile corporate borrowers. It is noted for its ability to 'understand not only client’s needs but also the other party'. In 2020, the team was instructed by the Polish Banking Association to assist with the procedures and documentation for the liquidity guarantee fund in response to the Covid-19 pandemic. Michał Mężykowski, who heads up the team, has expertise in finance transactions, regulatory issues and financial restructurings. Jakub Podkowa has expertise in real estate finance transactions, while Jakub Wieczorek is noted for project finance and leveraged finance matters. Counsel Marek Milwicz vel Delach leads the banking regulatory practice and has substantial experience of payment services and fintech issues.

Practice head(s):

Michał Mężykowski

Other key lawyers:

Jakub Podkowa; Jakub Wieczorek; Martyna Markiewicz; Marek Milwicz vel Delach


‘CMS banking team delivers high quality documents within agreed time. They are very engaged and available.’

‘Jakub Podkowa is a very business-oriented person who is aiming to achieve compromise over spending unproductive time on exchanging unnecessary comments.’

‘I believe they are quite flexible in respect of pricing.’

‘Competent and trustworthy.’

‘Michal Mezykowski is calm and professional.’

‘Very experienced lawyers, find the solutions to different scope of issues. Understand not only client’s needs but also the other party.’

Key clients

Grupa Azoty Polyolefins S.A.

BayernLB (Bayerische Landesbank)

Aareal Bank AG

Bank Powszechna Kasa Oszczędności Bank Polski (PKO BP)

Bank Polska Kasa Opieki (Pekao S.A)

Bank Gospodarstwa Krajowego (BGK)

Erste Bank AG

mBank S.A

ING Bank Śląski S.A.

Santander Bank Polska S.A.

Berlin Hyp AG

Polski Fundusz Rozwoju S.A. (PFR S.A)

Polskie Górnictwo Naftowe i Gazownictwo (PGNiG)

Work highlights

  • Advised Grupa Azoty Polyolefins on obtaining financing (in the form of debt financing and equity financing) for the implementation of Polimery Police project, including the construction of installations to produce propylene and polypropylene along with auxiliary installations.
  • Advising European Investment Bank, Bank Polska Kasa Opieki , Erste Bank AG, mBank S.A. and KomunalKredit Bank AG on financing of the construction of the waste-to-energy plant and peak load boiler house in Olsztyn in PPP project. This project was the first energy project in Poland to receive a “Green Loan”.
  • Advising BayernLB on financing of the construction of three wind farms with a total capacity of almost 52 MW by Pacifico Energy Partners, a renewable energy investment company.

Poland > Capital markets Tier 2

CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k. is most noted for its equity capital markets work, with a varied practice involving IPOs, development strategies for public companies, secondary and private placements and public market exits. The group is also increasingly active in securitisations. Practice head Rafał Zwierz often advises issuers and underwriters on a range of multijurisdictional public offerings and M&A. Senior associate Magdalena Zmysłowska is another key name for capital markets and corporate governance issues. In September 2021, Rafał Zakrzewski joined from Baker McKenzie Krzyżowski i Wspólnicy Sp.k.. Since publication, Katarzyna Grodziewicz left the firm.

Practice head(s):

Rafał Zwierz

Key clients

Advent International Corporation

InPost S.A.

Grupa Azoty S.A.

Grupa Azoty Zakłady Chemiczne „Police” S.A.

PKO Bank Hipoteczny S.A.

BNP Paribas Bank Polska S.A.

ING Bank Śląski S.A.

mBank S.A.

Bank Pekao S.A.

MZN Property S.A.

DataWalk S.A.

Nextbike S.A.

Biuro Maklerskie PKO Banku Polskiego

Work highlights

  • Advised InPost S.A on its first public offering and listing on the Euronext Amsterdam Stock Exchange – this was one of the largest IPOs to date of a business group from Poland (IPO’s value: €3.2bn), and the first IPO of a Polish company on Euronext Amsterdam.
  • Advised BNP Paribas Bank Polska S.A., Bank Pekao S.A. acting as dealers and co-arrangers and ING Bank Śląski S.A. acting as dealer on the establishment of the public bond issue programme with a value of up to PLN1bn by InPost S.A. and the first issuance of PLN-denominated bonds under the programme (with a total nominal value of PLN500m). The bonds issued under the programme were offered to qualified investors only and were introduced to trading in the alternative trading system organized by the Warsaw Stock Exchange.
  • Advised mBank S.A., which performed the function of security administrator, in connection with establishment of security for the first bond issuance (with a total nominal value of PLN500m) under the bond issue programme established by InPost with a total maximum nominal value of PLN1bn.

Poland > Commercial, corporate and M&A Tier 2

At CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k., the team has expertise in high-profile Polish M&A, with a particularly strong reputation in projects in the renewable energy, logistics and manufacturing sectors. The group is also active in matters with a nexus to the TMT, retail, insurance and life sciences industries. Department head Rafał Zwierz is triple-qualified to practise in Poland, the UK and US. Sławomir Czerwiński is a private equity expert. The ‘excellentBłażej Zagórski has a notable reputation for advising German-speaking clients. Counsel Olga Czyżycka is increasingly known for M&A and private equity deals.

Practice head(s):

Rafał Zwierz

Other key lawyers:

Sławomir Czerwiński; Błażej Zagórski; Dariusz Greszta; Mateusz Stępień; Olga Czyżycka; Jarosław Gajda; Marta Osowska-Buba


‘Very competent team; focused on business purpose, time and cost conscious. Excellent team player.’

‘They were professional and helpful, even on those issues that did not have a clear answer.’

‘Rafal Zwierz continues to be our primary client liaison at CMS Poland. His work is solid, with a good understanding of a client’s need and a good team to keep the final bill within the agreed budget.’

‘Strong ability to draw upon additional subject experts (e.g. tax, employment) as the transaction and negotiations evolve.’

‘Their service levels and understanding of how a UK M&A consolidator structures and carries out transactions were excellent and from a GC’s perspective they made my life easy. The key takeaway is this – it felt like I was using CMS in London on a UK deal.’

‘Błażej Zagórski is excellent but the real star is Marta Osowska-Buba – senior associate (should be a partner tbh). Very experienced and super smart – also not afraid to provide opinions and ‘advise’ us. Great to see!’

Key clients

Grupa Azoty Polyolefins S.A.

PIB Group Limited

Equinor ASA

Bank Pekao S.A.

Macquarie’s Green Investment Group

Partner in Pet Food

InPost S.A.

Polish Development Fund S.A. (Polski Fundusz Rozwoju S.A.)

PFR Ventures

Phillips Europe

Green Genius (Modus Group)

Orlen Południe

Compagnie d’Affrètement et de Transport – CAT SAS (Groupe CAT)

Advent International

CEE Equity Partners

Innova Capital



Poland > Data privacy and data protection Tier 2

‘Outstanding’ IT and data protection specialist Tomasz Koryzma leads the team at CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k., which handles IT system implementation projects and related disputes, data protection and GDPR advisory services, including representing clients before the data protection authorities, telecoms projects and cybersecurity support. Damian Karwala specialises in TMC law and fellow senior associate Paulina Komorowska is skilled in new technologies and cybersecurity.

Practice head(s):


‘Individual approach to the client with a business approach to the problem. A broader understanding of the problem while providing concrete support.’

‘They are always available and ready to solve your problems.’

‘High availability of the team, always prepared, always ready to give advice, thorough analysis of the case, exceptional knowledge of the market and data privacy issues, in-depth knowledge of Polish DPA decisions and practice; and able to prepare complex documentation on the basis of information given by the client, no matter how limited this information is.’

‘Tomasz Koryzma is an outstanding person in this area. He’s always very professional and involved. What is also very important he has comprehensive knowledge and experience.’

‘Damian Karwala has broad knowledge of international data transfers – I always take part in webinars, conferences if his speech is in the agenda. Excellent understanding of the Polish and international data privacy environment and always available to consult on difficult/urgent issues.’

Key clients

International Paper

Partner in Pet Food

Apo Discounter



eBay. Inc.

Iron Mountain


Ubezpieczenia Pocztowe

Grid Dynamics


Work highlights

  • Advising International Paper on various compliance and data-protection issues, including verification of GDPR implementation in a Polish subsidiary of International Paper and assistance in full-scope GDPR implementation in another International Paper subsidiary.
  • Advising the Polish subsidiary of Partner in Pet Food with regard to GDPR implementation.
  • Advising Diageo in relation to data privacy issues, including preparation of a model of cooperation with external marketing agencies and on the fulfilment of data protection notices.

Poland > Intellectual property Tier 2

IP enforcement specialist Tomasz Koryzma heads the practice at CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k.. The fashion and luxury goods, chemical and pharmaceutical and technology sectors are core focuses of the team, and trademark enforcement is a key part of the team’s offering, as well as trademark prosecution. The practice also recently expanded its offering, and now handles portfolio management for the team’s global clients. Senior associate Aleksandra Kuźnicka-Cholewa is another key name to note.

Practice head(s):

Other key lawyers:

Aleksandra Kuźnicka-Cholewa; Karina Zielińska-Piątkowska; Maciej Olejnik; Alicja Zalewska-Orabona


‘Vast capacity, high competence and professionalism, orientation on business gains. The team is a unique blend of young, energetic lawyers and senior staff with unique legal and business experience.’

‘All the lawyers we work with at CMS Poland are personally committed to us and always interested to meet with us, hear about our views and business developments, and discuss ways of how we can improve our collaboration and the service that they are offering us.’

‘They are genuine experts in their fields, knowledgeable about the issues we are currently facing, and pro-active in identifying potential new legal threats that may lie just around the corner.’

‘They are great at listening to us in order to manage our expectations, understand our needs and deliver value for us.’

‘We were further impressed with the firm’s sense of communication and urgency.’

‘CMS Poland has been a tremendous asset for our company and allowed us to be confident and aggressive in our IP pursuits.’

‘The personal attention and breadth of knowledge that they bring to the table in trade mark law is consistent and greatly appreciated.’

‘They demonstrate expertise across all relevant IP legislation and deliver timely, cost effective and practical commercial advice and have been instrumental in helping us with legal and strategic decisions.’

Key clients



HP Enterprise

HP Inc.

PKN Orlen

SKY International


Bayer AG

Lilou sp. z o.o.

eBay. Inc

Microsoft Corporation

Work highlights

  • Advising L’Oréal as an exclusive IP enforcement and anti-counterfeiting advisor in Poland.
  • Represented ITP in both patent and trademark related cases.
  • Advising HP on a countrywide IP protection project aimed at enforcing its patents against producers and importers of patent-infringing ink cartridges.

Poland > Private equity Tier 2

CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k.'s team advises international and regional CEE private equity houses, as well as funds with a sector focus, on the gamut of deals and investment strategies in Poland. The group has experience throughout the lifecycle of an investment, and lawyers are often instructed on the integration of acquired businesses, restructurings, growth strategies and divestments. Rafał Zwierz leads the corporate practice, while Sławomir Czerwiński coordinates private equity work. Błażej Zagórski, who has strong links with German-speaking clients, is experienced in transactions and restructuring projects. Counsel Olga Czyżycka is noted for her knowledge of restructuring and reorganisations of capital groups.

Practice head(s):

Rafał Zwierz; Sławomir Czerwiński

Other key lawyers:

Błażej Zagórski; Dariusz Greszta; Mateusz Stępień; Olga Czyżycka


‘Great service; commercial and detailed advice, going beyond the remit of a usual lawyer to ensure the transaction closes.’

‘They are our “go to” firm in Poland, heads and shoulders above their competitors in terms of depth of expertise, responsiveness, drafting, problem solving and commerciality.’

Key clients

Advent International

Abris Capital Partners

Macquarie’s Green Investment Group

Montagu Private Equity


Mid Europa Partners

Polish Development Fund S.A. (Polski Fundusz Rozwoju S.A.)

The Apax’s PIB Group Limited

PFR Ventures

mAccelerator and its portfolio funds


CEE Equity Partners

Innova Capital

Work highlights

  • Advised InPost on its first public offering and listing on the Euronext Amsterdam Stock Exchange.
  • Advised Cinven and its portfolio company Partner in Pet Food on the acquisition of Mispol S.A., a Polish pet food producer, from NDX Group.
  • Advised Innova Capital and its portfolio company PLIC on the acquisition of Estonian company Label Print.

Poland > Healthcare and life sciences

CMS Cameron McKenna Nabarro Olswang Posniak i Bejm sp.k.'s life sciences team advises clients on regulatory issues and product development and promotion, as well as corporate transactions.

CMS Poland is an international law firm which finds effective solutions for your legal challenges. We are one of the largest and most experienced international law firms in Poland – for over 25 years, we have been successfully working hand-in-hand with our clients that operate locally and cross-border.

With over 200 lawyers in Poland, we provide a full range of legal and tax advisory services to all sectors of the economy, advising on current challenges, as well as anticipating challenges on the horizon that are likely to shape the future. Our teams in Warsaw and Poznań operate as part of an international network of 80 offices with over 5000 lawyers located in 45 countries around the world, which allows us to offer you the highest quality legal advice, wherever you conduct or intend to conduct business.

As a future-facing firm, we take a bold, dynamic and agile approach to help clients of every size face the future with confidence. At CMS, we work in partnership with national and international businesses, from multi-nationals to start-ups, helping to meet business objectives, complete projects and close deals. The size of our teams and our international network of lawyers enable us to work on projects of any scale. Our clients include multinationals and the largest Polish enterprises, as well as family businesses, financial institutions and public-sector entities. Thanks to our lawyers’ sector specialisation and focus on regulated sectors, as a CMS client you will benefit from our comprehensive knowledge of current trends and challenges in your industry, as well as the support of a team that understands the specifics of conducting business in your sector of the economy.

Our experienced corporate and M&A experts offer you legal advice and support in transaction management. We can support you in capital market emissions, both nationally and internationally. If you are involved in a dispute, our business-minded dispute resolution team will develop the right tactics and strategy to navigate you through the process. We can also support your real estate and construction projects through all the phases. As Poland’s leading energy and environmental law team, we advise on all types of investment projects and regulatory issues. We also help businesses with financing projects, infrastructure and PPP undertakings, and advise you on compliance, competition, public procurement, new technologies and tax issues.

We see our expertise as a tool to find solutions to your legal problems and help ensure the continued success of your business.

If your business operates outside Poland, your legal issues will also be cross-border. CMS offers a unique coverage of Europe and beyond. With our geographical coverage, we can provide you with a seamless service and a single point of contact.

Managing Partner, CMS Poland/Head of Tax Andrzej Poś 48 22 520 56 73
Real Estate and Construction Agata 22 520 55 91
Banking & Finance/Restructuring & Insolvency Michał Męż 22 520 8307
Corporate/M&A/Capital Markets/Private Equity/Investment Funds Rafał 22 520 56 71
Competition Małgorzata Urbań 22 520 5597
TMT/Intellectual Property/Data Protection Tomasz 48 22 520 8479
Dispute Resolution Małgorzata 22 520 5555
Employment Katarzyna 22 520 5519
Energy & Projects/Infrastructure & Project Finance/ESG Marcin 22 520 5667
Insurance Ewa Ś 22 520 5581
Environment/ESG Agnieszka Skorupiń 22 520 8336
Life Sciences Małgorzata Urbań 22 520 5597
Public Procurement Małgorzata Urbań 22 520 5597
White Collar Crime Arkadiusz 22 520 5658
Investment Funds Błażej Zagó 48 22 520 84 01
Private Equity Sławomir Czerwiń 48 22 520 55 27
Dispute Resolution Anna 22 520 55 29
Maciej Andrzejewski photoMr Maciej AndrzejewskiSenior Associate
Marcin Bejm photo Marcin BejmPartner, Head of the Energy and Projects Department at CMS Poland
Michał Bork photoMr Michał BorkMichał Bork is a legal advisor and Counsel in the Real Estate…
Małgorzata Brauckmann-Sajkiewicz photo Małgorzata Brauckmann-SajkiewiczCounsel
Rafał Burda photo Rafał BurdaSenior Associate in the Corporate/M&A Department
Piotr Ciołkowski photo Piotr CiołkowskiPartner, Head of the Energy Regulatory Team at CMS Poland
Anna Cudna-Wagner photoMs Anna Cudna-WagnerPartner, Head of Dispute Resolution in Poland
Sławomir Czerwiński photo Sławomir CzerwińskiPartner in the Corporate/M&A Department
Olga Czyżycka photo Olga CzyżyckaCounsel in the Corporate/M&A Department
Katarzyna Dulewicz photoMrs Katarzyna DulewiczPartner
Lidia Dziurzyńska-Leipert photoMrs Lidia Dziurzyńska-LeipertLidia Dziurzynska-Leipert is a partner and head of the Construction Group within…
Jarosław Gajda photo Jarosław GajdaCounsel in the Corporate/M&A Department
Dariusz Greszta photoMr Dariusz GresztaSenior Counsel, Corporate/M&A Department
Adam Jodkowski photoMr Adam JodkowskiCounsel
Agata Jurek-Zbrojska photo Agata Jurek-ZbrojskaPartner, Head of Real Estate and Construction, Poland
Damian Karwala photoMr Damian KarwalaSenior associate
Maciej Kópczyński photoMr Maciej KópczyńskiSenior Associate
Tomasz Koryzma photoMr Tomasz KoryzmaPartner, Head of the IP/TMT Group
Arkadiusz Korzeniewski photoMr Arkadiusz KorzeniewskiPartner, Head of Corporate Crime in CEE
Katarzyna Kucharczyk photoMs Katarzyna KucharczykCounsel
Michał Meżykowski photo Michał MeżykowskiPartner, Head of the Banking and Finance Department in Poland
Tomasz Minkiewicz photo Tomasz MinkiewiczPartner, Head of the Oil & Gas Sector Team at CMS Poland
Mariusz Minkiewicz photoMr Mariusz MinkiewiczSenior Associate
Marta Osowska-Buba photo Marta Osowska-BubaSenior Associate in the Corporate/M&A Department
Andrzej Pośniak photo Andrzej PośniakManaging Partner at CMS Poland, Head of Tax
Grzegorz Pączek photo Grzegorz PączekSenior Associate in the Corporate/M&A Department
Tomasz Sancewicz photoMr Tomasz SancewiczCounsel, Attorney-at-law
Agnieszka Skorupińska photo Agnieszka SkorupińskaPartner, Head of the Environmental Law Practice in Poland and CEE
Mateusz Stępień photo Mateusz StępieńPartner in the Corporate/M&A Department
Łukasz Szatkowski photo Łukasz SzatkowskiPartner at CMS Poland
Małgorzata Urbańska photoMs Małgorzata UrbańskaPartner; Head of Competition Group in Poland; Head of Consumer Products Sector…
Jakub Wieczorek photo Jakub WieczorekPartner in the Banking and Finance Department
Błażej Zagórski photo Błażej ZagórskiPartner in the Corporate/M&A Department
Marcin Zbytniewski photoMr Marcin ZbytniewskiCounsel
Magdalena Zmysłowska photo Magdalena ZmysłowskaSenior Associate
Rafał Zwierz photo Rafał ZwierzPartner heading Corporate/M&A department and Capital Markets practice at CMS Poland
Ewa Świderska photoMs Ewa ŚwiderskaCounsel
Poland : over 200 lawyers in Warsaw and Poznan offices in Poland
CMS worldwide : over 5000 lawyers in 80 offices in over 45 countries

As a global future-facing law firm, diversity & inclusion are not just aspirations for us – they are an imperative. We are committed to fostering a supportive and inclusive culture that encourages authenticity and celebrates all our people and their unique backgrounds. As they are central to our culture, we ensure that diversity and inclusion are at the forefront.

Our aim is to build a culture of trust, respect and inclusion which embraces differences and encourages diversity of people, views and experiences for the benefit of all.

Our D&I strategy, Future Facing Inclusion, is a way of thinking and being. It brings together everyone at CMS, as well as our clients and communities, whatever their backgrounds, to develop thriving careers, positive cultures and new ways of working. It is a force for change.

Diversity & inclusion is championed at the senior level across the firm. Our Managing Partner, Andrzej Pośniak, is a great advocate for D&I and champions it internally and externally to ensure that CMS drives change not only for its people and communities, but also for the legal sector and the wider business community.

As for our D&I initiatives, once a year we organise the CMS Diversity & Inclusion Festival to celebrate differences, to keep this essential debate going, and to share our experience and knowledge. Moreover, in Poland we regularly join in the organisation of anti-discrimination initiatives, including meetings with the Polish Ombudsman, non-governmental organisations, leading Polish reporters and law students. In striving for gender equality, in 2021 we also partnered with the CFA Society Poland to release a report entitled “Women on boards and company performance”, which is aimed at verifying the view that gender equality is associated with better financial performance, lower risk, and a higher market valuation.