In Early 2012, a portfolio inside JPMorgan Chase’s Chief Investment Office was breaching its risk limits. Then the bank adopted a new value-at-risk model, and the problem seemed to go away. The new model roughly halved the portfolio’s reported risk. Within months, the trades later known as the “London Whale” https://ai-trading-system-develop07395.is-blog.com/188615/the-number-that-said-it-was-safe-institutional-lessons-in-algorithmic-trading-risk-management