Early In 2012, a portfolio in JPMorgan Chase’s Chief Investment Office was running over its risk limits. Then a new value-at-risk model arrived, and the problem seemed to vanish. The new model cut the portfolio’s reported risk roughly in half. Within months, the trades later known as the “London Whale” https://travissohbu.scrappingwiki.com/2727753/when_the_risk_model_is_the_risk_algorithmic_trading_risk_management_the_institutional_way