Macaskill on markets: What can Citadel see?

Citadel founder Ken Griffin may have felt more annoyed than threatened by his day testifying to Congress about volatility in GameStop and other stocks popular with retail investors, but scrutiny of market making and clearing is set to increase.

Ken Griffin, the founder of hedge fund Citadel and market maker Citadel Securities, had an insight into what to expect from the rest of a five-hour Congressional hearing on February 18 when Maxine Waters, chairwoman of the House of Representatives financial services committee, demanded that he answer some questions with ‘yes’ or ‘no’ answers.

After a query about market share, Waters asked whether Griffin could confirm that on January 27, the peak of the frenzy in GameStop trading, Citadel Securities had executed 7.4

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