TLDR: Chinese Government. Chinese Government announced it was investigating Didi for national security, which is usually code for corruption/ scaring managemen

TLDR: Chinese Government. Chinese Government announced it was investigating Didi for national security, which is usually code for corruption/ scaring management into greater compliance. Didi was a massively valuable Chinese company Uber owned a significant amount of. When the stock value crashed (-23% this quaarter), it destroyed a significant amount of book-value for uber who owned it.