Since the oil price tumble in the last six months, it may be time to reconsider buying large-cap energy stocks. Obviously the driver of these companies is the price of oil. A high price benefits all energy companies. Since there is a view that the price of oil has bottomed, these large-cap companies are bound to benefit from a rise in the price of oil in the future. Let's take a look at some of the best energy companies, with high volatility, TheStreet Quant Ratings says you should add to your portfolio, right now. Number 3 is Phillips 66. With an 'A' rating, the company's strengths can be seen in its attractive valuation levels and notable return on equity. 2nd is, Marathon Petroleum Corporation. This rating is an 'A.' Marathon Petroleum thrives in its compelling growth in net income and notable return on equity. Number 1 is Tesoro Corporation. With an 'A+' rating the company flourishes in its solid stock price performance and impressive record of earnings per share growth. TheStreet Ratings are algorithmic stock picks based on 32 major data points. S&P 500 stocks rated 'buy' yielded a 16.5% return in 2014, beating the S&P 500 Total Return Index by more than 300 basis points. For the full reports on these stocks, you can check out TheStreet.com/QuantRatings.