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Mariana Saienko
Counsel

Mariana Saienko

Kyiv, Ukraine
Languages
  • English
  • Ukrainian

Mariana Saienko is a Counsel in the Corporate/M&A Transactions practice group at CMS Ukraine and also a member of the wider CMS International Private Equity team. Mariana specialises in high-profile projects across infrastructure, energy, life sciences & healthcare, private equity, telecom, and IT sectors. She provides expert advice on complex joint ventures, corporate restructurings, private equity, and M&A transactions in Ukraine, CEE/CIS, Europe, and beyond. 

Mariana has particular experience in strategic investments into Ukraine, including transactions in energy, infrastructure and logistics, financial services, TMT and life sciences. She regularly acts as a key day-to-day client contact on complex cross-border mandates and coordinates multidisciplinary teams across the CMS network in Europe, Middle East and the UK.

Her recent work has included high-profile acquisitions and investments completed during the war, as well as projects connected with Ukraine's reconstruction and recovery. Alongside her transactional practice, Mariana has played a key role in the development and launch of Superhumans, Ukraine's major rehabilitation and prosthetics initiative, and continues to advise on rehabilitation and reintegration projects. Mariana is now deeply involved in the legal structuring of Supercity, a new spin-off initiative focused on the reintegration of veterans into civilian life through education, employment and business incubation.

Relevant experience

  • MSC/Yegor Grebennikov on the sale of a stake in intermodal businesses N’UNIT and Mostyska Dry Port to Medlog SA (MSC Group company), one of the top 10 shipping lines in the world, and the creation of a joint venture
  • A leading international life insurance group on the sale of its Ukrainian insurance business to one of the largest insurance groups in Central and Eastern Europe
  • White Star Real Estate on the acquisition of a corporate structure owning a 41-hectare site in Bucha, Ukraine, intended for the development of a new state-of-the-art logistics complex
  • Green for Growth Fund on the acquisition of a minority stake in a Ukrainian company holding the project rights essential for the development, construction, and operation of a solar power plant
  • Horyzonty a member of the MND Group, on the acquisition of Ukrainian Independent Geological Company LLC, a company operating in the upstream oil and gas sector in western Ukraine
  • Superhumans on its international expansion and multi-jurisdictional legal support
  • Dutch Good Growth Fund on its equity investment in Joint-Stock Company Joint Stock “Bank Lviv” and Bank Lviv on certain transactional documents in the acquisition (the first international equity investment into a Ukrainian bank during the war in Ukraine) transaction
  • Arise, a Swedish onshore wind farms developer, on its acquisition of a 70% stake in Norway and Ukraine-focused renewables developer Fenix Repower AS in a bid to diversify its business and gain a foothold in the Ukrainian market
  • EBRD on its acquisition of 35% of the shares in a modern multi-phase multi-tenant Lviv M10 industrial park project in Western Ukraine, developed by Dragon Capital
  • Goldbeck Solar Investment on the acquisition of a portfolio of RES projects in Ukraine and on establishing a joint venture with EBRD owning a portfolio of RES projects in Ukraine
  • MND a.s., a Czech energy group, on its acquisition of a 50% share in the 54.6 MWh Oriv wind power plant in Ukraine
  • Horizon Capital, a leading private equity firm in Emerging Europe, and Datagroup, a Ukrainian fibre infrastructure and digital services provider, on all the English law aspects of it leveraged acquisition of Volia, a leading cable and broadband service provider
  • Vodafone Ukraine, a leading mobile operator, and its parent company Neqsol Holding on Vodafone Ukraine’s landmark acquisition of Vega Telecom from SCM Group
  • Air Products, a leading industrial gases company, on the establishment of a bespoke joint venture with ArcelorMittal, the world’s leading steel and mining company, for the construction of a new modern air separation unit at the ArcelorMittal Kryvyi Rih steel plant in Ukraine
  • NAFTA International B.V., a Slovak oil and gas exploration, production and storage company, on the buyout of its joint venture partner, Cub Energy Inc., to become the sole owner of the Ukrainian company which holds a licence for the exploration and production of hydrocarbons near Uzhhorod, Ukraine
  • SUW South Ukraine Windplant Holdings Limited on sell side transactional support and advice on complex purchase price mechanics, including by way of a complex intra-group debt restructuring and complex tax issues
  • TIS Group (the owners of the largest private port in Ukraine) on a major joint venture transaction which brings DP World, one of the worlds’ largest port operators, directly to Ukraine for the first time
  • MV Cargo on the USD 100m joint venture with Cargill for the construction of a new grain terminal in Ukraine’s Black Sea port of Yuzhni
  • Acciona Energy on establishment of a joint venture with UDP Renewables, a leading investment and development company in the Ukrainian renewable energy industry, in relation to three solar power plants with the total capacity of 33.3 MW in the Odesa region of Ukraine
  • FAS Energy on the acquisition of a solar power plant in the Kyiv region, with an expected capacity of 112MW, effected during martial law
  • NEFCO (Nordic Environment Finance Corporation) on the acquisition of a stake in Joint-Stock Commercial Bank Lviv, including complex issues of putting in place a foreign-law shareholders’ agreement and conducting a debt-to-equity swap
  • A multinational technology company focusing on e-commerce, cloud computing, and artificial intelligence on a broad range of corporate and commercial matters, including structuring a business in Ukraine and opening new fulfilment centres across Europe and the Middle East
  • A world’s leading agricultural commodities merchant in connection with the sale of its sugar and crop production business in Ukraine, involving a complex debt restructuring with the use of a debt-to-equity swap
  • A leading building material company in connection with the potential acquisition of the largest Ukrainian companies operating in the industry of building materials; assisting the client in relation to the potential establishment of a joint venture with other investors for further expansion on the Ukrainian market
  • A leading automotive technology corporation on the potential acquisition of an automotive wiring harnesses business in more than ten jurisdictions, involving the transactional support and a legal due diligence of production facilities in Ukraine
  • A global technology and engineering company on corporate and commercial matters, including the supply of automation solutions for the critical infrastructure of Ukraine during martial law

Publications

2025

2024

2023

2022

Memberships & Roles

  • Ukrainian Bar Association
  • Attorney-at-Law, Ukraine – active bar licence

Education

  • 2014 - Master’s Degree in Law with Honours, Taras Shevchenko Kyiv National University
Practice Areas
Corporate / M&A
sectors
Private Equity Infrastructure & Projects

Insights by Mariana

See all Insights
News Ukraine

CMS advises MND Group company Horyzonty on acquisition of Ukrainian Independent Geological Company

17 Mar 2026 2 min read
News Ukraine

CMS advises Green for Growth Fund on minority stake acquisition in the solar project in Ukraine

05 Jan 2026 2 min read
Legal Update Ukraine

Ukraine revives plans for FDI screening in strategic sectors

30 Sep 2025 4 min read
Legal Update Ukraine

Commercial Code to be abolished in Ukraine

07 Feb 2025 5 min read
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