The document summarizes the rise and fall of Lehman Brothers, a major investment bank. It describes Lehman's growth from the 1850s as a cotton trader to a global investment bank. By the 2000s, Lehman had heavily invested in the real estate market, acquiring subprime lenders. However, the collapse of the housing market and subprime crisis in 2007-2008 led to Lehman's heavy losses. Despite emergency measures by the Federal Reserve, Lehman filed for bankruptcy on September 15, 2008, contributing to the global financial crisis.