3. PetroChina ( PTR) Company profile: PetroChina, China's largest producer of oil and gas, has become China's lone super major, and its oil reserves are on par with other major international players. Controlled by the Chinese government, its operations range from exploration and production, to refining and marketing and the transmission and storage of natural gas. Investor takeaway: PetroChina's shares are up 21% this year and have a three-year annualized return of 29%. S&P has it rated "hold," as the share price has exceeded its target price. S&P's analysts' survey found two "buy" ratings, one "buy/hold," and three "holds." Given Iran's moves to cut back its supply to Western Europe, worldwide oil prices are likely to rise and this company could be in a sweet spot as a provider with plenty of oil assets to tap. Analysts expect its earnings to grow by 20% this year to $14.15.