The stock markets were jarred again last Wednesday when the electronic dealer Knight Capital went out of control and sent huge numbers of unintended orders to various exchanges.
Miller also defrauded another broker-dealer into taking on a significant short position in Apple stock to hedge against the large purchase of Apple stock he was executing at Rochdale, authorities said.
Jenny Quyen Ta , founder of Titan Securities, a broker-dealer in Dallas, was disciplined in 2010 for alleged misconduct that included using her Twitter account to tout stock in Advanced Micro Devices Inc.