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NEW YORK ( TheStreet) -- The ex-dividend date for Iron Mountain (NYSE: IRM) is tomorrow, March 21, 2012. Owners of shares as of market close today will be eligible for a dividend of 25 cents per share. At a price of $29.22 as of 9:30 a.m. ET, the dividend yield is 3.4%. The average volume for Iron Mountain has been 1.7 million shares per day over the past 30 days. Iron Mountain has a market cap of $5.85 billion and is part of the technology sector and computer software & services industry. Shares are down 4.8% year to date as of the close of trading on Monday. Iron Mountain Incorporated, together with its subsidiaries, provides information management services primarily in North America, Europe, Latin America, and the Asia Pacific. The company has a P/E ratio of 23.2, above the average computer software & services industry P/E ratio of 16.1 and above the S&P 500 P/E ratio of 17.7.