Teekay Tankers upgraded to Buy from Sell at UBS UBS analyst Spiro Dounis double upgraded Teekay Tankers (TNK) to Buy from Sell and raised his price target for shares to $7.25 from $6.75. The provider of marine transportation closed yesterday up 19c to $6.11. The stock has more upside potential than downside risk after falling over 20% from the 52-week high, Dounis tells investors in a research note. The analyst believes Teekay's recent purchase of 12 Suezmaxes and a Ship-to-Ship transfer business are accretive to the valuation. Further, he expects the company to generate "significant" cash flow in 2016, which he thinks could lead to a "large" dividend increase. The analyst this morning also downgraded Diana Shipping (DSX) to Sell from Neutral.