Which U.S. investment bank collapsed in September 2008 during the global stock-market crash?

Lehman Brothers collapsed in September 2008 during the global stock-market crash.

The investment bank filed for Chapter 11 protection on September 15, 2008, after efforts to find a buyer failed. Its balance sheet was deeply exposed to mortgages and other real-estate-linked assets whose values had fallen during the United States housing crisis.

Lehman's failure triggered a fresh shock across global markets. Banks became less willing to lend to one another, investors sold risky assets, and governments intervened to prevent wider financial collapse. The bankruptcy is widely regarded as a turning point in the crisis.

The question can cause confusion because several major firms faced danger in 2008. Bear Stearns was rescued in March, while Merrill Lynch was sold to Bank of America; Lehman Brothers was the major investment bank that entered bankruptcy.