Hadrien Chef

Hadrien works closely with many different types of clients in Belgium’s thriving tech, pharma, and biotech landscape. From start-ups to multinationals, his advice helps clients identify how to succeed and grow as a business.

Hadrien is an experienced corporate lawyer who specialises in mergers and acquisitions (M&A), venture capital, public offerings, corporate reorganisations, corporate and securities law, and corporate finance. As a Partner in Osborne Clarke’s Brussels corporate team, he advises on public and private M&A and acts for clients on a wide variety of transactional matters and restructurings, including setting up, financing, reorganising, acquiring, or liquidating business ventures; he also provides litigation services in these areas. He furthermore supports clients with ECM, prospectus issuance, and advice on market abuse and related disputes. He also supports insurance companies and intermediaries with their regulatory needs and defends them before Belgian and international regulators.

Hadrien works with clients at the cutting edge of pharma, biotechnology, and medtech. His clients active in this sector include Sunrise, Kiomed, BioKuris, BioSenic, ImmunXperts, Delphi Genetics, Vesale Pharma, Kitozyme, Gabi Smartcare, Tasso, OncoDNA, Stellaris, and BepharBel Manufacturing. He also works with funds like Circular Innovation Fund, Takeda Ventures, Gilde Healthcare, AdBio, Vives, Elaia, and Andera Partners.

While an undisputed specialist in life sciences, Hadrien has significant expertise in other areas, including technology, ESG, transportation, and automotive, regularly advising on M&A transactions, joint ventures, and investment schemes. In particular, he works with technology companies active in Belgium and throughout Europe, helping them with strategic partnerships, investments, and acquisitions. For example, he has recently advised Safran, P&V Assurances, Carmeuse Ventures, Audiense, Acapela, Bolt, Cream Consulting, and Fortino Capital on acquisitions, sales, or investments; and Aidoptation, Merchery, Greentripper, and Greenomy on financing rounds or exits.

Hadrien is ranked as an Up and Coming Lawyer for Corporate/M&A in Chambers' 2025 European and Global Guides and is noted in the Legal 500 Commercial, Corporate and M&A, Insolvency and restructuring and Industry focus: Healthcare and life sciences sections for his expertise and experience. 

"He is always prepared, highly effective and delivers advice with precision and clarity. His ability to combine technical excellence with commercial insight makes him a valuable and trusted adviser."

Chambers & Partners, Global Guide 2026

"Hadrien Chef is an increasingly prominent figure in the Belgian M&A market. He is a popular choice for clients seeking transactional assistance in the pharmaceutical and biotech sectors."

Chambers & Partners, European Global 2025

Hadrien Chef has the very rare combination of responsiveness and efficacy while managing workload and stress."

The Legal 500, Europe Guide 2025