Simmons & Simmons

Tax Partner

Siamak Mostafavi has been a recognised tax specialist in the market for over 30 years. He advises French and international clients of renowned financial institutions and investment funds such as JP Morgan, Barclays, Citi, Goldman Sachs, Morgan Stanley and BAML on a wide range of transactions including equity and debt securities, derivatives, asset financing, capital markets, securities portfolio transfers and derivatives and cross-border transactions.

Previously Senior Counsel at Dentons in Paris, Siamak Mostafavi began his career at EY in 1984 as a tax associate, before joining HSBC in 1988 as a tax advisor in the capital markets team. In 1992, he joined Gide where he was appointed Tax Partner before successively joining Allen & Overy (1999-2013) and then Jones Day (2013-2018). He holds an MBA from HEC in Paris and has been a member of the Paris Bar since 1992.

Siamak is the leading French tax specialist of the French equity capital markets, and is regularly invited by the relevant market associations (ISDA, AFME, ISLA) to make presentations on the latest changes to the French rules and market practices.