NEW YORK (TheStreet) -- WebMD Health Corp. (WBMD) stock is up by 4.75% to $62.42 on heavy trading volume on Thursday, after the S&P Dow Jones Indices announced the company will join the S&P MidCap 400.

The health information services company will replace SunEdison (SUNE) on the index after the market close on Friday, the S&P Dow Jones Indices said in a statement on Wednesday. 

The S&P MidCap 400 is an index measuring the stock performance of mid-sized companies.

"SunEdison is ranked at the bottom of the index and has a market capitalization that is no longer representative of the mid-cap market space," group added.

So far today, 1.59 million shares of WebMD have traded, higher than the company's 30-day average of about 819,000 shares.

Separately, recently, TheStreet Ratings objectively rated this stock according to its "risk-adjusted" total return prospect over a 12-month investment horizon. Not based on the news in any given day, the rating may differ from Jim Cramer's view or that of this articles's author.

TheStreet Ratings rates this stock as a "buy" with a ratings score of A-. This is based on the convergence of positive investment measures, which should help this stock outperform the majority of stocks that we rate. The company's strengths can be seen in multiple areas, such as its solid stock price performance, impressive record of earnings per share growth, compelling growth in net income, revenue growth and expanding profit margins. We feel its strengths outweigh the fact that the company shows weak operating cash flow.

You can view the full analysis from the report here: WBMD

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