Ken Griffin sells stake in Citadel Securities to Sequoia and Paradigm for $1.15B Posted on January 11, 2022 at 9:59 am. Ken Griffin has sold a $1.15 billion stake in Citadel Securities to Sequoia and Paradigm. The deal values Citadel Securities [Read More]To access this content, you must be a member. Visit the Plans page for details.