Collapse of Lehman Brothers

The filing for Chapter 11 bankruptcy protection by financial services firm Lehman Brothers on September 15, 2008, remains the largest bankruptcy filing in U.S. history, with Lehman holding over $600 billion in assets.

The bank had become so deeply involved in mortgage origination that it had effectively become a real estate hedge fund disguised as an investment bank. At the height of the subprime mortgage crisis, it was exceptionally vulnerable to any downturn in real estate values.

The bankruptcy triggered a drop in the Dow Jones of more than 500 points, the largest decline since 9/11.

Lehman was one of the first Wall Street firms to move into the business of mortgage origination. In 1997, Lehman bought Colorado-based lender, Aurora Loan Services, an Alt-A lender. In 2000, to expand their mortgage origination pipeline, Lehman purchased West Coast subprime mortgage lender BNC Mortgage LLC. Lehman quickly became a force in the subprime market. By 2003 Lehman made $18.2 billion in loans and ranked third in lending. By 2004, this number topped $40 billion. By 2006, Aurora and BNC were lending almost $50 billion per month.

Lehman had morphed into a real estate hedge fund disguised as an investment bank. By 2008, Lehman had assets of $680 billion supported by only $22.5 billion of firm capital. From an equity position, its risky commercial real estate holdings were three times greater than capital. In such a highly leveraged structure, a three- to five-percent decline in real estate values would wipe out all capital.

Lehman borrowed significant amounts to fund its investing in the years leading to its bankruptcy in 2008, a process known as leveraging or gearing. A significant portion of this investment was in housing-related assets, making it vulnerable to a downturn in that market. One measure of this risk-taking was its leverage ratio, a measure of the ratio of assets to owners equity, which increased from approximately 24:1 in 2003 to 31:1 by 2007. While generating tremendous profits during the boom, this vulnerable position meant that just a 3–4% decline in the value of its assets would entirely eliminate its book value of equity. Investment banks such as Lehman were not subject to the same regulations applied to depository banks to restrict their risk-taking.

In August 2007, Lehman closed its subprime lender, BNC Mortgage, eliminating 1,200 positions in 23 locations, and took a $25-million after-tax charge and a $27-million reduction in goodwill. The firm said that poor market conditions in the mortgage space "necessitated a substantial reduction in its resources and capacity in the subprime space".

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