This excerpt taken from the NDAQ DEF 14A filed Apr 21, 2006.
Series C Cumulative Preferred Stock
On February 15, 2006, we redeemed all outstanding shares of our Series C cumulative preferred stock. We were required to redeem the Series C stock after the closing of our common stock offering, which took place on the same date. At the time of redemption, the Series C accrued dividends at an annual rate of 3.0%, which would have increased to 10.6% after July 1, 2006. The total redemption price was $104.7 million, which also reflected accrued but unpaid dividends and a make-whole premium. We paid this entire amount to NASD, which was the sole holder of the Series C.