Klarna CEO Sebastian Siemiatkowski said it was a "very special" moment after the company was given a $19.5 billion valuation after going public Wednesday Shares of the buy-now-pay-later company rose more than 30$1.37 billion in its initial public offering. The stock opened at $52 per share, which was higher than its expected$40 pricing.  "It is a fantastic marketing opportunity," Siemiatkowski told "The Claman Countdown" on Wednesday. "In the U.S., there's been a d ...