JPMorgan Chase & Co.

The London Whale episode became a bank-governance accountability test because a portfolio presented as protection against credit stress grew into a concentrated and difficult-to-exit trading position while model changes reduced its reported risk, repeated limit breaches failed to force de-risking, valuation challenge lacked independence, material control information did not reach directors and supervisors in time, and public loss estimates had to be revised before separate regulators imposed remedies under different legal authorities.