<P> Securities trade in the latter nineteenth and early twentieth centuries was prone to panics and crashes . Government regulation of securities trading was eventually seen as necessary, with arguably the most dramatic changes occurring in the 1930s after a major stock market crash precipitated an economic depression . </P> <P> The Stock Exchange Luncheon Club was situated on the seventh floor from 1898 until its closure in 2006 . </P> <P> The main building, located at 18 Broad Street, between the corners of Wall Street and Exchange Place, was designated a National Historic Landmark in 1978, as was the 11 Wall Street building . </P> <P> The NYSE announced its plans to merge with Archipelago on April 21, 2005, in a deal intended to reorganize the NYSE as a publicly traded company . NYSE's governing board voted to merge with rival Archipelago on December 6, 2005, and became a for - profit, public company . It began trading under the name NYSE Group on March 8, 2006 . A little over one year later, on April 4, 2007, the NYSE Group completed its merger with Euronext, the European combined stock market, thus forming NYSE Euronext, the first transatlantic stock exchange . </P>

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