Investment companies Sequoia Capital and Paradigm completed a $1.15bn investment in Citadel Securities, an American multinational hedge fund and financial services company. "The talent of our extraordinary market making team combined with our powerful risk management techniques have transformed the client experience in the many markets we serve. In Sequoia and Paradigm, we have partners that appreciate how the strength of our market expertise, advanced predictive analytics and superlative software engineering can redefine an industry. We look forward to their partnership and to welcoming Alfred to our Board as Citadel Securities accelerates its growth," Ken Griffin, Citadel Securities Chairman.