Just a year ago, the five biggest investment banks on Wall Street were Morgan Stanley, Goldman Sachs, Merrill Lynch, Lehman Brothers and Bear Stearns.

Now the Bear is gone, brought down by the mortgage debacle and sold in the spring at a fire-sale price to J.P. Morgan Chase.

Monday morning brought more bad news on the financial front, this time from the bank listed at No. 4.

Lehman Brothers, a storied investment bank with a 138-year history, announced it was filing for Chapter 11 bankruptcy protection in the wake of losses stemming from the credit crisis and...

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