Griffin's Citadel had invested $2 billion in January into Melvin Capital Management LP, which was at the center of the GameStop Corp GME Short Squeeze. What Happened: Ken Griffin's Citadel LLC and ...

The hedge fund Citadel LLC and the market maker Citadel Securities say they had nothing to do with the app Robinhood suspending some trading in stocks that have recently experienced a surge in ...

Editor’s note: This article has been updated to remove a reference to Ken Griffin’s political affiliations. Ken Griffin, founder of hedge‑fund giant Citadel LLC, told Stanford business students that ...

Sources tell the Wall Street Journal that talks involving Blackstone Group and Ken Griffin's hedge-fund and securities-trading operations have been contentious, and it’s unclear if there’ll be a deal.

Citadel LLC is further paring back its $2 billion investment in Melvin Capital Management after the hedge fund stumbled in its effort to recover from a near collapse triggered by surges in GameStop ...

OK, so—a group of individual investors collaborated via a Reddit message board to drive up the price of stock issued by the video game retailer GameStop. They did so in part because they were aware ...

Citadel is a two-headed business beast consisting of Citadel LLC, a $68 billion hedge fund operation best known for its top-performing multistrategy flagship Wellington, and Citadel Securities, a ...

(Bloomberg)—Citadel Securities LLC lost its case against the SEC over a market order type from the IEX exchange of “Flash Boys” fame that features a 350-microsecond delay, after arguing the regulator ...