Melvin Capital got the margin call. Presumably they were already familiar with the concept. https://www.bloomberg.com/news/articles/2021-01-25/citadel-point72-

Melvin Capital got the margin call. Presumably they were already familiar with the concept. https://www.bloomberg.com/news/articles/2021-01-25/citadel-point72-to-invest-275-billion-in-melvin-capital https://www.bloomberg.com/news/articles/2021-01-25/citadel-p...