Exempt offerings play a significant role in capital formation in the United States. Offerings conducted in reliance on Rule 506 account for 99% of the capital reported as being raised under Regulation D from 2009 to 2012, and represent approximately 94% of the number of Regulation D offerings.190 The significance of Rule 506 offerings is underscored by the comparison to registered offerings. In 2012, the estimated amount of capital reported as being raised in Rule 506 offerings (including both equity and debt) was $898 billion, compared to $1.2 trillion raised in registered offerings.191

http://www.sec.gov/rules/final/2013/33-9415.pdf