Oleksandr Aleksyeyenko > Marchenko Partners > Kiev, Ukraine > Lawyer Profile

Marchenko Partners

Work Department

Antitrust & Competition


Partner, Head of Antitrust & Competition



Oleksandr Aleksyeyenko is a notable Ukrainian competition law practitioner. Oleksandr has been advising Clients for more than a decade on complex merger clearances and investigations on unfair competition, abuse of dominant position and cartels. He has a strong focus on state aid issues and competition compliance. He also has vast experience of advising Clients on issues related to Intellectual Property and Employment. Previously Oleksandr advised Clients on International Finance transactions.


English, Chinese, Ukranian, Russian


  • American Chamber of Commerce in Ukraine, Competition Committee Co-Chair
  • Public Council with the Antimonopoly Committee of Ukraine
  • International Competition Lawyers Network
  • International Bar Association
  • Ukrainian Bar Association


Master of Laws (Hons) (International Law), Kyiv International University

Lawyer Rankings

Ukraine > Intellectual property

(Leading individuals)

Oleksandr Aleksyeyenko - Marchenko Partners

Marchenko Partners has a leading practitioner in practice head Oleksandr Aleksyeyenko, who focuses predominantly on IP contracts and disputes, including antitrust cases with a significant IP element. Aleksyeyenko focuses mainly on trade marks and patents, though the firm also handles copyright issues, trade secrets, database matters, domain names and unfair competition. Its work encompasses complex and high-profile cases for international clients such as Next Retail and LafargeHolcim.

Ukraine > Employment

Marchenko Partners is particularly skilled at advising on internal policies, employment contracts and termination strategies. Oleksandr Aleksyeyenko, who leads the employment, IP and antitrust practices, is experienced in labour due diligence and contentious matters. Among his impressive roster of multinational clients are British Airways and Ferring Pharmaceuticals.

Ukraine > Competition

Oleksandr Aleksyeyenko heads the practice at Marchenko Partners, which has been increasingly active handling merger clearances, compliance advice and investigations involving cartels, abuse of dominance, unfair competition and state aid matters. The firm is a pioneer in the state aid field, having acted on the first Ukrainian state aid complaint under the new regulatory regime. The team counts international companies such as McDonald’s and Next Retail among its clients.