Rosenblatt Securities has entered the listed options business by hiring an options sales, trading and strategy team. Gary Wisnow, previously of FBN Securities, has been named managing director of derivates sales and trading. Steven Williams, formerly of Ramius Capital Group, has been appointed chief derivatives and ETP strategist. Fabian Amezaga, previously of Citigroup Derivatives Markets, joins as vice president in derivatives sales and trading. Matthew Stoeber, formerly of FBN Securities, joins as a trading clerk.