CMS maintains a large data protection team comprised of ‘exceptional’ individuals who possess a ’mastery of the subject matter’. The firm is a leading adviser to major international clients across technology, fintech, energy, and financial services, specialising in complex matters. The group's expertise encompasses the entire compliance lifecycle for generative AI, DORA, e-Privacy, and data transfers, as well as high-value work in cybersecurity, HR data processing, and TMT-related M&A. The team is led by Dóra Petrányi, who focuses on cybersecurity, data protection, and GDPR matters. CEE data protection co-ordinator Márton Domokos and Katalin Horváth, an expert in fintech and AI law, add depth, and are complemented by Péter Homoki, who shines for his ‘deep IT expertise’. The team is further supported by Anna Zsófia Horváth, who develops guidelines to enable the effective application of EU data protection and IT policies.
Legal 500 Editorial commentary
Accolades
Client satisfaction: Sector knowledge
Testimonials
Collated independently by Legal 500 research team.
- ‘Péter Homoki's professional knowledge is impressive. The fact that he not only has legal knowledge but also deep IT expertise has greatly helped during the collaboration.’
- 'Both Katalin Horváth and Márton Domokos are exemplary speakers, demonstrating their mastery of the subject matter through workshops that are both exceptionally engaging and of the highest calibre.’
- ‘I had the pleasure of working with Márton Domokos and attending several workshops held by Márton and Katalin Horváth. Márton truly sets himself apart as a professional; he is a genuine business partner who provides calm, instantaneous, and supportive counsel even in the most complex situations. His profound knowledge (and interest) of the company and focus on risk management make his legal advice uniquely valuable and a testament to his expertise.'
- ‘The professionals I had the privilege of working with possess a truly exceptional combination of qualities. Their unwavering dedication to their field ensures they maintain a profound level of expertise, which they share by providing excellent workshops for their peers. What truly sets them apart, however, is a quality that goes far beyond professional courtesy: a deep and insatiable curiosity for global initiatives and innovations.'
- ‘CMS takes into account not only national but also international decisions and resolutions in its advice on data protection. It strives to respond in a reasonable time and, on request, in English, which gives it an advantage over many domestic data protection lawyers.’
- ‘Márton Domokos is great, effective, kind, and explains matters without complex legal jargon.’
Key clients
- Microsoft Baumit BP Raiffeisen Kyndryl Holdings, Inc Samsung Electronics RTL Group Magyar Telekom Plc IT Services Hungary SimplePay Plc HelloPay Plc MOL
Work highlights
Advised Samsung Electronics on day-to-day data protection matters, regulatory issues, contracting procedures, and the local feasibility of global features.
Acted for Microsoft in a wide array of data protection matters and their strategic projects for over a decade.
Represented OTP Group (SimplePay, HelloPay, OTP Bank) in a wide array of data protection matters and in data breach management.
Lawyers
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.
Next Generation Partners
Junior partners with significant recognition from clients and peers in the market and key roles on multiple matters.
Practice head
Dóra Petrányi
Other key lawyers
Katalin Horváth; Márton Domokos; Péter Homoki; Anna Zsófia Horváth