No, the CDO trade that everyone knows about. The official narrative only focuses on the main tranche of the trade, but there were couple other smaller positions in the same book so the total loss was just over $10bn. The fact that Hubler was actually paid upon his exit was a f*cking joke, too. Just a few years later, your former shop has dropped a similar amount on the credit indices, if I recall correctly. Very similar setup, too. PS. I am good friends with a guy who lost about a billion at Citadel. Not as big of a number, but it was a proper trading loss.