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Vanessa Sounthakith advises clients on all aspects of French and international taxation. Her practice focuses on national and cross-border transactions (M&A, private equity, and real estate) as well as on individual tax matters and tax litigation before the French tax authorities and tax courts. In particular, Vanessa advises on venture capital financings, equity incentive schemes, and management packages.

Prior to joining Jones Day in 2022, Vanessa worked for a French boutique tax law firm that is dedicated to private clients. She also practiced at international law firms where she served on their tax teams.

In addition, Vanessa teaches French corporate taxation of companies and tax consolidation at the University of Paris 1 Panthéon-Sorbonne.


  • Altarea acquires Prejeance Industrial from RepsolJones Day advised Altarea in the acquisition of Prejeance Industrial (a French company specializing in the development of small to medium-sized rooftop photovoltaic projects) from the Spanish group Repsol.
  • Natixis and Morgan Stanley Europe enter into derivatives forward transactions with ENGIE S.A. and ENGIE Group Participations S.A. and complete their hedging by way of private placement of €273 million of Gaztransport & Technigaz S.A.’s Ordinary SharesJones Day represented Natixis S.A. and Morgan Stanley Europe SE, acting as hedging banks in the derivatives transactions and joint global coordinators in the private placement, in connection with derivatives forward transactions with ENGIE S.A. and ENGIE Group Participations S.A. over Ordinary Shares of Gaztransport & Technigaz S.A. and the private placement executed through an accelerated bookbuild offering of approximately €273 million of Gaztransport & Technigaz S.A.'s Ordinary Shares, as part of the hedging bank’s hedge of their commitment under the derivatives forward transactions.
  • Bpifrance, INCO Ventures and SEB Alliance invest in VulkamJones Day advised Bpifrance, INCO Ventures and SEB Alliance in the €34 million financing of Vulkam, a deeptech company whose mission is to revolutionize metallurgy through the industrial development of amorphous metals.
  • Bpifrance (SPI fund) participates in €61 million Series C financing of CorWave, together with other investorsJones Day advised Bpifrance (SPI fund) in connection with the €61 million Series C financing of CorWave, a high-tech medical devices company that has developed a next-generation heart pump based on a breakthrough technology, the wave membrane pump, together with other investors.
  • Forsee Power completes €50 million capital increaseJones Day advised Forsee Power, a French company listed on the regulated market of Euronext Paris which specializes in the design, manufacture, and marketing of intelligent battery systems for the electromobility market, in its capital increase without shareholders’ preferential subscription rights but with priority subscription period for an amount of approximately €50 million.
  • Optium Capital leads Series A financing of BeFCJones Day advised Otium Capital in leading the €16 million Series A financing of BeFC, a French start-up company providing a sustainable paper-based biofuel cell and ecofriendly microelectronics.
  • Bpifrance (SPI fund), GoCapital and NCI invest in ExpliseatJones Day advised Bpifrance (SPI fund), GoCapital and NCI in the €17 million Series B financing of Expliseat, a company specializing in the design and manufacture of innovative lightweight seat technology.
  • Mozoo Group sold to Olyn GroupJones Day advised Mozoo Group and its shareholders in the sale of Mozoo Group to Olyn Group.
  • Ansys acquires leading particle dynamics simulation software RockyJones Day advised Ansys, Inc. in the acquisition of Engineering Simulation and Scientific Software Rocky DEM, S.L., a leading provider of particular dynamics simulation software with developers in Brazil, Spain, and the United States.
  • Société Generale, Demeter and ADEME participate in €35 million financing round of Qarnot ComputingJones Day advised Société Generale Ventures, Demeter and ADEME in connection with their participation in the €35 million financing round of Qarnot Computing, a French start-up using data centers and computers as heat source.
  • Doctolib acquires Vettore RinascimentoJones Day advised Doctolib, the leading e-health company in Europe, in its acquisition of Vettore Rinascimento, an Italian company specializing in the development of software for the healthcare sector.
  • Back Market raises $510 million in Series E roundJones Day advised Back Market, a French company specialized in the development and exploitation of an online marketplace dedicated to refurbished products, in connection with its $510 million Series E round of financing led by Sprints Capital with the support of existing investors Eurazeo, Aglaé Ventures, General Atlantic and Generation Investment Management.
  • Pigment raises $73 million in Series B financing roundJones Day advised Pigment, a French-based company having developed a powerful strategic planning and forecasting platform that helps businesses implement and maintain company plans, in connection with its $73 million Series B round of financing led by Greenoaks.