By market close, shares had taken off 4.2% to $27.21.
The enterprise storage and information services provider recorded net income of 15 cents a share, a nickel less than a year earlier. Analysts surveyed by Thomson Reuters had forecast net income of 22 cents a share.
Revenue of $768.53 million was short consensus of $775.44 million.
"Our business fundamentals for the fourth quarter were in line with our expectations, and we are pleased with the underlying trends in the business as we move into 2014," said CEO William L. Meaney in a statement.
Management guided for fiscal 2014 revenue between $3.09 billion and $3.17 billion. Analysts forecast sales of $3.12 billion.
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TheStreet Ratings team rates IRON MOUNTAIN INC as a Hold with a ratings score of C. The team has this to say about their recommendation:
"We rate IRON MOUNTAIN INC (IRM) a HOLD. The primary factors that have impacted our rating are mixed -- some indicating strength, some showing weaknesses, with little evidence to justify the expectation of either a positive or negative performance for this stock relative to most other stocks. The company's strengths can be seen in multiple areas, such as its revenue growth, expanding profit margins and good cash flow from operations. However, as a counter to these strengths, we also find weaknesses including a generally disappointing performance in the stock itself, generally higher debt management risk and disappointing return on equity."