This excerpt taken from the NDAQ 10-K filed Feb 28, 2007.
In the first quarter of 2006, we completed a public offering of 15,979,513 shares of common stock, of which we sold 8,042,142 shares issued from common stock in treasury and NASD and other selling stockholders sold 7,937,371 shares. Other selling stockholders initially received their shares through the exercise of warrants they purchased in our 2000 and 2001 private placements. We used a portion of the net proceeds obtained from this offering to fund the redemption of our Series C Cumulative preferred stock.
In May 2006, we completed another public offering of 18,500,000 shares of our common stock, for net proceeds of $665.2 million before the deduction of offering expenses. These proceeds were used to prepay a portion of the amount outstanding under the April 2006 Credit Facility.