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 ...

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 ...

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 ...

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 ...

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 LLC, one of the world’s largest hedge-fund firms, has hired one of the industry’s few female founders. Samantha Greenberg is closing her hedge fund, Margate Capital, to join Citadel. Ms.