Editor's Note: In this feature from Stockpickr, we highlight lists of stocks that have been upgraded by analysts, or which are experiencing activist situations or other market-moving events.Rumors of the Day: Shares of Countrywide Financial ( CFC) are 10% higher Tuesday after reports in the Wall Street Journal that billionaire investor Warren Buffett could be interested in parts of the company if they are sold. The Journal said Buffett could find the company's debt-servicing business and its portfolio of mortgages and mortgage-backed securities attractive. The stock surged $2.07 to $21.88. Today's Hot List: Dick's Sporting Goods ( DKS) reports second-quarter earnings of 83 cents a share, beating estimates by 6 cents. The company reported revenue of $1.01 billion, vs. $991.8 million consensus. The stock is increasing $4.32, or 7.8%, to $59.90. Analyst Downgrades: Goldman downgraded Tim Hortons ( THI) to neutral from buy, on the basis of valuation relative to other restaurant plays. The firm sees the coffee and donut chain as a "safe haven" for investors because of strong fundamentals, but it also sees limited upside. Goldman gave Tim Hortons a $35 price target. The stock was dipping 22 cents at $32.03. Analyst Upgrades: Goldman upgraded Darden Restaurants ( DRI) to buy from neutral, on the basis of valuation. The firm also increased its price target to $50, as Darden's successful closure of its Rare Hospitality ( RARE) acquisition and upward EPS revisions are driving shares higher. The stock is up $1.17, or 2.9%, to $41.47. Latest Activist Situations: In an amended regulatory filing on Freeport-McMoRan ( FCX), Atticus Capital disclosed that it had raised its stake in the company to 7.48%. In its original filing, Atticus said it had "met with, and may in the future continue to meet with, third parties to encourage them to consider strategic transactions." The stock is increasing $1.95, or 2.4%, to $81.91.