NEW YORK (TheStreet) -- Shares of Express Scripts (ESRX) were falling 1.8% to $85.13 after-hours Monday despite the healthcare services company's positive fourth quarter results, in which it beat analysts' estimates for earnings and revenue.

Express Scripts reported earnings of $1.39 a share for the fourth quarter, beating analysts' estimates of $1.38 a share for the quarter. Revenue grew 2.1% year over year to $26.31 billion for the quarter, above analysts' estimates of $25.68 billion for the quarter.

Looking forward to full year 2015 Express Scripts said it expects to report earnings of $5.35 to $5.49 a share, compared to analysts' estimates of $5.44 a share for the year.

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"While we are proud of our heritage and the work we have done for clients, we are even more excited about the future we have ahead of us," Chairman and CEO George Paz said in a statement. "We believe our growth and focused acquisition approach has positioned us uniquely in the healthcare services landscape to improve health outcomes and lower cost in an aligned model that keeps our clients and patients first, but also returns exceptional results to our shareholders."

TheStreet Ratings team rates EXPRESS SCRIPTS HOLDING CO as a Buy with a ratings score of A. TheStreet Ratings Team has this to say about their recommendation:

"We rate EXPRESS SCRIPTS HOLDING CO (ESRX) a BUY. 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 increase in stock price during the past year, growth in earnings per share, increase in net income, reasonable valuation levels and largely solid financial position with reasonable debt levels by most measures. We feel these strengths outweigh the fact that the company shows weak operating cash flow."

You can view the full analysis from the report here: ESRX Ratings Report

ESRX data by YCharts

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