Editor's Note: In this feature from Stockpickr, we highlight lists of stocks that have been upgraded by analysts or are experiencing activist investor situations or some other market-moving events. Rumors of the Day: Shares of 3Com ( COMS) skyrocketed after the telecom-equipment maker agreed to a $2.2 billion deal to sell itself to Bain Capital and China's Huawei Technologies. The $5.30-a-share price represents a 44% premium of 3Com's closing price Thursday. The stock soared 35% to $4.98. Today's Hot List: Lockheed Martin ( LMT) raised its quarterly dividend by 20% to 42 cents a share and increased its stock-repurchase program by an additional 20 million shares. Shares of the aerospace and defense company gained 1.3% to $108.19. Investing services company Duff & Phelps ( DUF) debuted on the New York Stock Exchange in its initial public offering Friday. The stock is trading up 8% at $18.39, after pricing 8.3 million shares at $16 apiece. Analyst Downgrades: UBS downgraded Atlantic Tele-Network ( ATNI) to neutral rating from buy but raised its price target to $40 from $35. It also lifted its full-year 2008 earnings-per-share estimates to $2.09 from $2.06. Shares sunk 6% to $36.13. Analyst Upgrades: Keefe, Bruyette & Woods upgraded Cullen/Frost Bankers ( CFR) to outperform from market perform. KBW lowered estimates because of the recent interest rate cut but said the company has a solid balance sheet and the stock appears inexpensive. Shares added 43 cents to $50.50. Latest Activist Situations: According to StreetInsider.com's 13D Tracker page, FL Group, a large shareholder of AMR ( AMR) is urgign the American Airlines parent to consider strategic alternatives to increase shareholder value. In a regulatory filing, the firm said alternatives include the separation of AAdvantage -- American Airlines' frequent flyer loyalty program -- from the main business. The firm believes such a move that such a spinoff could result in "value creation of more than $4 billion." AMR shares were up 1% at $22.27.