Citadel Securities: how the Wall Street outsider became ‘the Amazon of financial markets’

Why consistency is extremely lucrative. Citadel Securities’ embrace of technology under founder Ken Griffin allowed it to adapt far quicker to changes in financial markets than the investment banks has led it to domination. Joe Rennison, Madison Darbyshire, Philip Stafford and Stefania Palma explore how the company became to be involved in more than 25 per cent of all US stock trades and why it is the now focus of SEC scrutiny.