https://m.benzinga.com/article/19379228
Citadel was called one of the largest market-makers by Denier and a possible contributor to Thursday’s events.
Clearinghouses didn’t raise rates fast enough before the collapse of Lehman Brothers, according to Denier. He said the broker's clearing firms raised collateral rates related to GameStop on Thursday.
The CEO said he was angry when he got a call Thursday from the clearing firm and had to stop supporting transactions in GameStop and AMC Entertainment.
Denier told Benzinga his company was working hard to open trading on the halted names as quickly as possible.