Shares surged 10.02% to $125.99 on Thursday, marking a second straight daily gain and topping the previous $121 peak set on 21 April.
The move came in a broad market rally, with the S&P 500 up 1.02% and the Dow Jones Industrial Average rising 1.62%.
Iron Mountain also outperformed Prologis, IBM and Digital Realty Trust, while trading volume reached 5.0 million shares, well above its 50-day average of 1.5 million.
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