Nordic American Tankers increases ownership of Nordic American Offshore NAT has increased ownership in NAO to 19.2% the first two days of this week from 18.0% in December 1. The recent aggregate NAT purchase of 488,216 shares in NAO amounts to an investment of $5.8M. The shares were bought at prices ranging from $12.89 to $10.39 per share. NAO has 23,431,370 shares in issue. Nordic American Offshore Ltd. is a separate and independent company of NAT. A subsidiary of NAT is the business manager of NAO as it is for NAT.