5. Sunoco ( SUN) Company profile: Sunoco, with a market value of $5 billion, is an energy company engaged in the refining of petroleum products and the operation of crude-oil and refined-products pipelines and terminals. On April 30, Energy Transfer Partners ( ETP) announced it reached an agreement for the acquisition of Sunoco in a $5.3 billion deal. Investor takeaway: Its shares jumped 25% in the second quarter and 41% this year. Sunoco had been repositioning its business for the past few years, getting rid of its refineries. The buyout represents a 25% premium to outstanding share prices. 4. TripAdvisor ( TRIP) Company profile: TripAdvisor, with a market value of $6 billion, is a leading online travel media platform, operating in the U.S. and internationally. Investor takeaway: Its shares surged 28% in the second quarter and 80% this year. First-quarter revenue grew 23% year-over-year, driven by "click-based advertising," which makes up about 80% of sales, and stronger-than-expected hotel shopper traffic and better advertising rates. Morningstar projects 18% revenue growth this year and 10% net income growth.
3. Dean Foods ( DF) Company profile: Dean, with a market value of $3 billion, is the nation's largest processor and distributor of milk and related dairy products, which include more than 50 local and regional brands. Investor takeaway: Its shares rose 37% in the second quarter and 48% this year. The company achieved significant cost cuts and price hikes in its core dairy business in the period. As a result, it raised its earnings outlook for the second quarter to 28 cents to 33 cents a share, above the 22 cents a share analysts were looking for. 2. Edwards Lifesciences ( EW) Company profile: Edwards, with a market value of $12 billion, manufactures a range of medical devices and equipment for advanced stages of heart disease, including tissue heart valves, surgical clips and catheters. Investor takeaway: Its shares climbed 40% in the second quarter and 44% this year. The stock got a big boost early in June when the FDA approved its Sapien transcatheter heart valve for wider use. Morningstar says Edwards' efforts to focus on efficiency and higher-margin products have paid off. 1. Expedia ( EXPE) Company profile: Expedia, with a market value of $6 billion, is the world's largest online travel agent, as a provider of booking services for hotel rooms, airline tickets and rental cars. Businesses include Expedia, Hotels.com and Hotwire. Investor takeaway: Its shares soared 44% in the second quarter and 66% this year, as consumers shop for bargains online. Still, S&P has it rated "sell" because of "maturing market growth and growing competition." Morningstar notes that its international bookings growth is slower than its peers, as Expedia grew by 30% annually since 2007, compared with 53% at Priceline ( PCLN).