[Citadel Miami New Headquarters Construction Halted Due to On-Site Accident] According to Bloomberg, Citadel's new headquarters project in Brickell, Miami, has been ordered to stop construction following the collapse of equipment at the site last week, which resulted in at least four people being hospitalized with minor injuries. Founded by billionaire Ken Griffin, Citadel is one of the world's largest hedge fund management companies and operates independently from its affiliated market maker, Citadel Securities. The company plans to build a multi-billion-dollar headquarters building in the area.