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Editor's Note: TheStreet ratings do not represent the views of TheStreet's staff or its contributors. Ratings are established by computer based on metrics for performance (which includes growth, stock performance, efficiency and valuation) and risk (volatility and solvency). Companies with poor cash flow or high debt levels tend to earn lower ratings in our model. NEW YORK ( TheStreet) -- MarkWest Energy Partners (NYSE: MWE) hit a new 52-week high Thursday as it is currently trading at $60.60, above its previous 52-week high of $60.58 with 317,195 shares traded as of 12:12 p.m. ET. Average volume has been 685,800 shares over the past 30 days. MarkWest Energy has a market cap of $7.64 billion and is part of the basic materials sector and energy industry. Shares are up 15.9% year to date as of the close of trading on Wednesday. Markwest Energy Partners, L.P., together with its subsidiaries, engages in the gathering, processing, and transportation of natural gas the United States. The company has a P/E ratio of 35, above the S&P 500 P/E ratio of 17.7.