Rouven Siegemund advises German and international companies on all areas of German corporate law, focusing on M&A transactions, venture capital financing, and start-ups.

Rouven is member of Osborne Clarke’s “India Desk” and advises large Indian corporations on their M&A activities in Germany.

As much, he advises venture capital investors from all over the world in relation to their investments in promising German companies and German start-ups in all stages of development – from establishing and expanding their businesses to the exit.

Rouven joined Osborne Clarke in 2010. In 2016, he worked in Osborne Clarke’s Silicon Valley offices in Palo Alto and San Francisco, helping US clients in particular with their expansion into Europe. He continues to advise clients on their international expansion plans as a member of Osborne Clarke’s “International Expansion & Growth” practice.

Rouven studied law in Cologne/Germany and Clermont-Ferrand/France. During his legal traineeship, he spent three months in Montréal/Canada where he worked for the prestigious Canadian law firm Gowling Lafleur Henderson LLP.

In addition to his professional practice as a lawyer, Rouven is involved with numerous national and international start-up events in the capacity as coach, mentor, and jury member.


Osborne Clarke has once again advised the battery system provider Instagrid on a successful financing round. The start-up raised a total of USD 95 million in its Series C, read more.

Bechtle AG

Osborne Clarke berät Bechtle AG bei wichtiger KI-Transaktion. Lesen Sie hier mehr. 


Osborne Clarke has advised SaaS start-up aifora on its sale to US-based Centric Software, read more.

Waverley Capital

Osborne Clarke advises Waverley Capital in Series B funding round at Endel, read more


Osborne Clarke advises Indian IT group Infosys on acquisition of digital agency Oddity, read more


Osborne Clarke advises battery specialist instagrid on EUR 29 million funding round


Osborne Clarke advises Taxdoo in Series B funding round with Tiger Global


Osborne Clarke advises the founders of justETF GmbH on the sale of the company to Scalable Capital GmbH, read more

n8n GmbH

Series A round for Berlin based software company n8n GmbH for EUR 10 million, read more


Osborne Clarke advises Taxdoo on Series A Financing Round.

Sequoia Capital and firstminute capital

Osborne Clarke advises Sequoia Capital and firstminute capital on investment in n8n GmbH, read more

PT Elegant Textile Industry

Osborne Clarke advises PT Elegant Textile Industry on the acquisition of the majority stake in Spinnerei Lampertsmühle, read more

Trade Republic

Osborne Clarke advises Trade Republic on investment by Creandum and Project A, read more

Gründerfonds Ruhr and High-Tech Gründerfonds

Osborne Clarke advises Gründerfonds Ruhr and High-Tech Gründerfonds on €1.5m investment in talpasolutions, read more

Goodix Technology

Osborne Clarke advised Goodix Technology on acquisition of Commsolid, read more


Osborne Clarke advises Acellere on €2.25m series A financing round, read more


International legal pratice Osborne Clarke has advised the Hamburg-based VAT start-up Taxdoo on a seed financing from (High-Tech Gründerfonds) HTGF.


Advised Homelike on investment by Cherry Ventures, read more

Merus Capital

Advised Merus Capital on investment in Silexica, read more

Arvato Financial Solutions

Advised Arvato Financial Solutions on investment in solarisBank, read more

Contact Rouven