Viking started trading on the New York Stock Exchange on Wednesday at $26.15 under the ticker "VIK." The company's IPO coincides with a strong rebound in cruise bookings.Viking is not your typical cruise operator.

Viking will debut Wednesday on the New York Stock Exchange with a market valuation estimated at about $10.3 billion, the biggest U.S. initial public offering this year. On Tuesday, the luxury cruise operator priced its IPO at $24 a share;

The cruise operator sold 64 million shares to raise $1.54 billion at a valuation of $10.36 billion. The deal was upsized from 53 million shares that it had disclosed would be sold a week ago. The selling shareholders are CPP Investment Board PMI-3 Inc.