Bankruptcy of Lehman Brothers
The bankruptcy of Lehman Brothers, also known as the Crash of '08 and the Lehman Shock, on September 15, 2008, was the climax of the subprime mortgage crisis. After the financial services firm was notified of a pending credit downgrade due to its heavy position in subprime mortgages, the Federal Reserve summoned several banks to negotiate financing for its reorganization.
Source: Wikipedia — Bankruptcy of Lehman Brothers (CC BY-SA 4.0)