ZESA Attorney Partnership > Istanbul, Turkey > Firm Profile

ZESA Attorney Partnership

Turkey > Competition Tier 2

The ‘excellent competition lawyers‘ at boutique firm ZESA Attorney Partnership are dedicated to this area of law and support clients in the full range of investigations as well as transactional matters. Zeynep Ergün, ‘one of the most reputable competition lawyers in Turkey‘ works on both the transactional side and in investigations, while her co-founding partner Sibel Yılmaz Atik has extensive experience of significant cartel and abuse of dominance investigations.

Practice head(s):

Zeynep Ergün; Sibel Yılmaz Atik


‘Excellent competition lawyers with good understanding.’

‘The two founders Zeynep Ergün and Sibel Artik are stellar partners and truly dedicated to what they do. Zeynep has tremendous experience and provides through competition law advice. Sibel is extremely responsive, very pragmatic and always to the point in her advice – a wonderful lawyer to work with! They are our first choice for competition law advice in Turkey.’

‘I frequently work with Sibel Atik who has a good business mindset and excellent knowledge of competition law. Sibel is very reachable and she is always ready to help and provide tailor-made services.’

‘The team around the highly experienced and competent Zeynep Ergun is very responsive, communicates very well among each other, is highly diverse (two women partners in lead) and has very competitive pricing.’

‘Zeynep Ergun clearly is one of the most reputable competition lawyers in Turkey. She is very experienced, always up to date, with an incredible knowledge of the law. She is further very hands on and very pragmatic, delivering quick and practicable solutions to clients. Her experience allows her to work hand in hand with international law firms providing seamless advice with very high quality. She has an incredible network.’

‘ZESA law, headed by Zeynep and Sibel, is a very client-oriented law firm. The team is very responsive, provides feedback and analyses as well as merger control filings within a short period of time. They are true experts for the Turkish market and have in-depth knowledge in their practice group regarding Turkish case law.’

‘Both Zeynep and Sibel (together with their team) are extremely responsive and take care of their clients’ needs. They provide immediate and tailor-made feedback as well as analyses and have a good network.’

‘Highly professional, exceptional antitrust expertise, amazing team.’

Key clients

NIVEA Beiersdorf Turkey

Bayer Türk Kimya San. Ltd. Şti.

Dr. Ing. h.c. F. Porsche

LG Turkey


Pernod Ricard Turkey

Tesa Turkey

Enerjisa Üretim Santralleri A.Ş.

CGV/Mars Cinema Group

HP Türkiye


Yelp Inc.

Yandex LLC

Work highlights

  • Representing Nivea Beiersdorf Turkey in the investigation against fast-moving consumer goods suppliers and retailers.
  • Advising Doğanay Gıda on an investigation against food and beverages suppliers and retailers/distributers.
  • Acting for Porsche in the investigation initiated against five companies related to emission standards.