Ruben Koslar is a member of the Paris Bar. He joined the firm in 2015 after having worked for several years in one of the leading French business law firms.
He advises international, including German-speaking, clients in M&A transactions, as well as on all aspects of corporate law. He has significant deal experience in a variety of business sectors, including retail/ consumer goods, MedTech/ life sciences, logistics, automotive/ mobility, as well as infrastructure, including renewable energies.
Ruben is regularly quoted as an expert on foreign investment control in France. He is also a lecturer at the Law School (Ecole de Droit) of SciencesPo (Paris), where he teaches a class on legal aspects of M&A transactions at master level.
Background
Lawyer since : 2015
Bar. : Paris
Language(s) : French - English - German
Training :
- University of Cambridge (2010)
- Sciences Po (2012)
Member of :
- International Association of Young Lawyers (AIJA)
- SciencesPo Alumni
- Stiftung der deutschen Wirtschaft (sdw)
Publications
- Foreign investment control deserves greater transparency – L’Agefi, 08/06/2023 – Quote by Karl Hepp de Sevelinges and Ruben Koslar
- MergerMarket: European Legal Advisory Viewer: AI ascendancy offers activity hotspot as watchdog expertise drives mandate wins
- Control of foreign investments in France: continuity, but a delicate balance between sovereignty and attractiveness – Le Monde du droit, 10/05/2023
- Recent case law of the Court of Cassation concerning a “Distress M&A” transaction: good news for the transferring shareholders, but vigilance is still required! – Le Monde du droit, 12/04/2023
- Flash German Desk – January 2021
- Citation de Karl Hepp de Sevelinges et Ruben Koslar, conseils de Daimler AG
Jeantet advised SYNLAB Group in the sale of the multi-site medical biology laboratory BARLA to the Inovie Group
Paris, December 17, 2025 – Jeantet advised Synlab group on the sale of its majority stake in the share capital of BARLA (Biologistes Associés Regroupant des Laboratoires d’Analyses), operating a multi-site medical biology laboratory in the Alpes-Maritimes and Var regions, to Inovie Labosud. The entire transaction was carried out in full agreement and collaboration with […]
| CORPORATE – M&A – PRIVATE EQUITY | TAX
Jeantet advises Agile Robots on its acquisition of thyssenkrupp’s Automation Engineering business unit
Paris, 24 November 2025 – Jeantet acting alongside the German law firm Arqis, advised the German company Agile Robots SE, a leading provider of AI-powered robotic solutions, on its acquisition of the Automation Engineering business unit of thyssenkrupp Automative Technology. The transaction is still subject to regulatory approvals and closing is expected to be completed […]
| CORPORATE – M&A – PRIVATE EQUITY | EMPLOYMENT | REAL ESTATE | IP, TECH & DATA LITIGATION | ENVIRONMENT
Jeantet advises CUREETY in connection with its acquisition of CONTINUUM PLUS SANTÉ
Paris, June 6, 2025 – Jeantet is advising Cureety in connection with its acquisition of the company Continuum Plus Santé, both specializing on remote monitoring for cancer patients. Through this acquisition, Cureety consolidates its leadership position in remote monitoring in oncology, particularly through better management of the “Hospital-City-Home” care pathway by enabling the involvement of […]
Paris | CORPORATE – M&A – PRIVATE EQUITY
Jeantet advises SOGESTRAN in the acquisition of REEDEREI JAEGERS GMBH
Paris, 20 January, 2025 – Jeantet advised the French Sogestran group in the negotiation and signing of a binding agreement on 18 December 2024, according to which the Sogestran Group will acquire Reederei Jaegers GmbH, specialized in inland waterway liquid bulk transport, during the first quarter of 2025. This transaction, including the acquisition of 57 […]
Paris | CORPORATE – M&A – PRIVATE EQUITY
Jeantet advises QUADPACK on its acquisition by PSB INDUSTRIES
Paris, 21 November, 2024 – Jeantet is advising the listed company Quadpack Industries on its acquisition by PSB Industries, both specialized in the development, manufacture and distribution of packaging for the cosmetics industry, for approximately EUR 140 million. Quadpack Industries, a Catalan-based company listed on Euronext Growth Paris, and PSB Industries (the parent of the […]
Paris | CORPORATE – M&A – PRIVATE EQUITY
Jeantet advises BOSSARD group on the acquisition of AERO NEGOCE INTERNATIONAL group
Paris, July 24, 2024 – Jeantet has advised the Swiss Bossard Group, a leading global provider of product solutions and services in the field of industrial fastening and assembly technology listed on SIX Swiss Exchange (BOSN), in the signing of an agreement for the acquisition of the French group Aero Negoce International (ANI). Aero Negoce […]
| CORPORATE – M&A – PRIVATE EQUITY
Jeantet advised JUNGBUNZLAUER group in the context of the acquisition of ALLIANCE GUMS & INDUSTRIES from ROQUETTE group
Paris, 1 March 2024 – Jeantet advised Jungbunzlauer group on the acquisition of Alliance Gums & Industries from Roquette Ventures, part of the Roquette group. On February 29, 2024, Jungbunzlauer group completed the acquisition of Alliance Gums & Industries from Roquette Ventures, part of the Roquette group. Alliance Gums & Industries is an expert blending […]
Paris | CORPORATE – M&A – PRIVATE EQUITY
Jeantet advised MOBILITY TRADER HOLDING in the context of the sale of CARIZY to COFIDIS GROUP
Paris, 2 February 2024 – Jeantet advised Mobility Trader Holding GmbH, the parent company of the heycar group (Berlin, Germany), held by the Volkswagen, Allianz and Renault groups on the sale of Carizy SAS to the Cofidis group. On January 31, 2024, Mobility Trader Holding GmbH, the parent company of the heycar group (Berlin Germany), […]
Paris | CORPORATE – M&A – PRIVATE EQUITY
Jeantet advised EB-SIM in the context of the acquisition of three wind parks from Volkswind, a subsidiary of the Swiss energy company Axpo
Paris, 3 January 2024 – Jeantet advised EB Sustainable Investment Management GmbH on the acquisition of a portfolio of three operating wind farms with a total nominal capacity of 72 MW from Volkswind GmbH, a subsidiary of the Swiss energy company Axpo. On December 15, 2023, Volkswind GmbH, German subsidiary of the Swiss energy company […]
Paris | CORPORATE – M&A – PRIVATE EQUITY | ENERGY
Foreign investment control deserves greater transparency – L’Agefi, 08/06/2023 – Quote by Karl Hepp de Sevelinges and Ruben Koslar
Quel que soit le nom employé – autonomie stratégique, souveraineté économique, reconquête industrielle, etc. -, les investissements étrangers en France figurent en bonne place dans le débat. La révision des lignes directrices de leur contrôle pourrait donner l’occasion à Bercy de préciser ses exigences. Explications avec Karl Hepp de Sevelinges, associé et Ruben Koslar, counsel […]
Paris | MERGERS & ACQUISITIONS (large & mid cap)
MergerMarket: European Legal Advisory Viewer: AI ascendancy offers activity hotspot as watchdog expertise drives mandate wins
To read the article, download the PDF
Paris
Control of foreign investments in France: continuity, but a delicate balance between sovereignty and attractiveness – Le Monde du droit, 10/05/2023
Karl Hepp de Sevelinges, partner, and Ruben Koslar, counsel, decipher for Le Monde du Droit the 2023 annual report on the control of foreign investments in France (IEF).
Paris | CORPORATE – M&A – PRIVATE EQUITY