ADVANT Beiten Opens London Office with New Addition Sebastian Diehl

Munich/London, 8 September 2025 – The international law firm ADVANT Beiten is opening a German presence in London this September with Sebastian Diehl, LL.M. (Cambridge). Sebastian Diehl joins as an Equity Partner and will advise on German law, in particular on cross-border transactions, together with a cross-practice and cross-location London team of ADVANT Beiten. 

Sebastian Diehl joins from Standard Chartered Bank in London where he led the legal coverage on multiple of the group’s M&A and venture capital transactions, including in Europe, Asia and North America. Prior to Standard Chartered, Sebastian Diehl spent several years in the London office of a leading German law firm, most recently as Associated Partner. There he regularly advised strategic clients and financial investors on cross-border M&A projects and PE/VC transactions with a focus on Germany.

With London, ADVANT Beiten is opening its tenth office and its fourth international presence outside of Germany. The new office will be based in Mayfair within the premises of its alliance partner ADVANT Nctm, whose London office has been established since 2008. With this expansion, the firm strengthens its visibility on the European market, expands its advisory services for cross-border transactions and further intensifies the co-operation within the alliance. A cross-practice team of ADVANT Beiten partners will be regularly present in London.

"In Sebastian Diehl, we have found an experienced partner for our new location who has an excellent network. Specialising in cross-border transactions and private equity, he brings in many years of experience in all areas of transaction advisory services and will work closely with our teams in Germany and worldwide," comments Dr Guido Krüger, Managing Partner of ADVANT Beiten.

"London is one of the world's leading financial and economic centres with a broad infrastructure for capital markets, asset management and private equity," says Dr Barbara Mayer, member of the Steering Committee at ADVANT Beiten, adding: "The city connects entrepreneurs, fund managers, banks and institutional investors. Together with our local colleagues from ADVANT Nctm and the addition of Sebastian Diehl, we are further expanding our transaction-orientated advisory services."

With London as one of the most active cross-border transaction markets in Europe, the city plays a key role in many German investments – particularly in the upper German SME segment which is facing the challenge of company succession. ADVANT Beiten is taking account of this multifaceted market environment with the opening of the new office – both locally and across borders. 

For more information, see our Spotlight London.

Public Relations
Frauke Reuther
Communications Manager
ADVANT Beiten
+49 (69) 75 60 95 - 570
frauke.reuther@advant-beiten.com