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 client identify how to success 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 security law, and corporate finance. In his role as Partner in Osborne Clarke’s Brussels corporate team, he advises on public and private M&As, and acts for clients on a wide variety of transactional matters and restructurings, including setting-up, financing, reorganising, acquiring, or liquidating business ventures, also providing litigation services in these areas. He furthermore supports clients with ECM, prospectus issuance and market abuse advice or disputes.

Hadrien works with clients at the cutting edge of pharma, biotechnology medical diagnostics and medtech. For example, he has been advising OncoDNA, a cancer theranostic company, for several years as their trusted advisor in both M&A and their commercial expansion. Other clients active in biotech, medtech, and medical diagnostics include Sunrise, Kiomed, BioKuris, BioSenic, ImmunXperts, Delphi Genetics, Vesale Pharma, Kitozyme, Gabi Smartcare, Tasso, and BepharBel Manufacturing.

While an unquestioned specialist in the field of life sciences, Hadrien has significant expertise in other areas, including technology, media and communications, and transportation and automotive, again 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 RTL Group, P&V Assurances, Audiense, Acapela, Bolt, Cream and Fortino on their acquisitions, sale or investments and Sunrise, Merchery, Greentripper and Greenomy on their financing rounds.

Hadrien Chef is a great lawyer, we have had very responsive, sympathetic and extremely qualitative interactions. Hadrien is able to provide directly very good insights and advice on a large range of corporate, financial and even tax law matters. It is quite unique to be able to answer rather complex questions on the spot and this is a very valuable experience for the client.

Legal 500, 2023

Hadrien Chef keeps a cool head in difficult circumstances which allows him to provide clear advice.

Legal 500, 2023
Fortino Capital

Advised Fortino Capital in its investment in addactis Group SA, the pioneering Risktech partner for (re)insurers.


Advised Greenomy, a Belgium based sustainable finance technology platform, on the partnership and investment round led by Euroclear.


Advised OncoDNA on its various investment rounds as well as on the acquisition of its Spanish subsidiary and French listed subsidiary.


Advised Sunrise on their recent fundraising of €17 million to support the roll out of their ground-breaking sleep medical device in Europe and the American market.

Cream Consulting

Supported the shareholders of Cream Consulting, a Brussels based leading IT consulting company, in its sale to the French digital transformation and business advice company, Audensiel for a majority shareholding.


Advised the shareholders of Acapela, a Belgium-based leading software developer of text-to-speech programs, in their sale to Tobii Dynavox AB.


Advised the listed company BioSenic on its reversed merger with the French company Medsenic as well as various private placement of shares and convertible bond programs.

Audiense Group

Advised on the integration of SOPRISM within Audiense's group of companies.

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