Publicly traded under NYSE symbol IRM, Iron Mountain is an S&P 500 company and a member of the Fortune 1000 (currently ranked: 643). <ref>[http://www.ironmountain.com/company/about-us.html Iron Mountain About]</ref> | Publicly traded under NYSE symbol IRM, Iron Mountain is an S&P 500 company and a member of the Fortune 1000 (currently ranked: 643). <ref>[http://www.ironmountain.com/company/about-us.html Iron Mountain About]</ref> |