Citigroup is strengthening its equity derivatives trading and delta one teams in London with two senior appointments, SRP understands. Mike Bitton recently joined Citi from Unicredit as a senior director in equity finance and delta one trading. Bitton joined Unicredit in 2004 and held a number of roles at the Italian bank including head of index arbitrage and most lately, head of structured linear derivatives. Before joining Unicredit, Bitton worked at Société Générale from 1997 to 2004. His l