The London-based co-head of global equity derivatives trading for Goldman Sachs, Krishna Rao, has left the US investment bank and is set to retire from the industry. Rao was made partner at Goldman's European fixed income, currencies and commodities business in October 2006. SRP understands that his role is being assumed by Philip Berlinski, head of equity derivatives flow trading in London, who will co-head global equity derivatives trading with Peter Selman in New York. Berlinski was promot