The Wall Street Journal looks at the decline in the number of U.S. firms with publicly traded stock using data from Wharton Research Data Services (WRDS):
The number of U.S. firms with publicly traded stock has dropped by half in the past decade. Ten years ago, around 9,100 companies filed annual proxy statements with the Securities and Exchange Commission. Last year, roughly 6,450 did; so far in 2010, only about 4,100 have, estimates Wharton Research Data Services.
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