An era on Wall Street ended Sunday night as Goldman Sachs Group Inc. and Morgan Stanley - the last two large independent investment banks remaining - announced they would become bank holding companies, subjecting themselves to greater regulation and effectively agreeing to take on fewer risks.

The moves capped an end to a tumultuous week on Wall Street, in which two other investment banks lost their independence. Last Monday, Merrill Lynch & Co. agreed to be bought by Bank of America Corp., and Lehman Brothers Holdings Inc. declared bankruptcy.

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