IT infrastructure provider EMC (EMC) is falling after William Blair analyst Jason Ader downgraded the stock to Market Perform from Outperform in a note to investors earlier today. Last quarter, EMC had difficulty closing deals with large corporate customers, according to the analyst. As a result, the company's fourth quarter results are likely to be in-line with or below analysts' expectations, while its 2013 guidance is likely to be below the Street's outlook, wrote Ader. New data storage technologies are emerging, creating increased competition for companies that develop storage solutions, including EMC, Ader believes. The enhanced efficiency of some of these technologies is pressuring incumbent vendors, while the growth in spending on storage solutions has slowed significantly, the analyst wrote. In mid-morning trading, EMC fell 41c, or 1.70%, to $23.72. Other companies that develop storage solutions also dropped, with NetApp (NTAP) losing 2.74% to $32.33, Brocade (BRCD) giving back 1.45% to $5.42, and STEC (STEC) declining 1.80% to $4.92.