| SC 13G | 2016-01-28 | BlackRock Inc. | IRON MOUNTAIN INC | 13,294,196 | 6.3% | EDGAR |
| SC 13G/A | 2015-02-13 | RYAN VINCENT J | IRON MOUNTAIN INC | 15,894,566,845 | 7.6% | EDGAR |
| SC 13G/A | 2015-02-13 | Capital World Investors | IRON MOUNTAIN INC | 24,940,333 | 11.8% | EDGAR |
| SC 13G | 2015-02-12 | PARNASSUS INVESTMENTS /CA | IRON MOUNTAIN INC | 10,556,778 | 5.0% | EDGAR |
| SC 13G/A | 2015-02-10 | VANGUARD GROUP INC | IRON MOUNTAIN INC | 26,267,170 | 12.5% | EDGAR |
| SC 13G | 2015-02-06 | VANGUARD SPECIALIZED FUNDS | IRON MOUNTAIN INC | 12,184,652 | 5.8% | EDGAR |
| SC 13G | 2015-02-02 | BlackRock Inc. | IRON MOUNTAIN INC | 12,080,477 | 6.2% | EDGAR |
| SC 13G/A | 2014-12-10 | VANGUARD GROUP INC | IRON MOUNTAIN INC | 25,954,389 | 12.4% | EDGAR |
| SC 13G/A | 2014-02-14 | HIGHFIELDS CAPITAL MANAGEMENT LP | IRON MOUNTAIN INC | 8,828,516 | 4.6% | EDGAR |
| SC 13G/A | 2014-02-14 | RYAN VINCENT J | IRON MOUNTAIN INC | 15,853,477,845 | 8.3% | EDGAR |
| SC 13G/A | 2014-02-13 | Capital World Investors | IRON MOUNTAIN INC | 20,948,014 | 10.9% | EDGAR |
| SC 13G | 2014-02-11 | VANGUARD GROUP INC | IRON MOUNTAIN INC | 11,617,764 | 6.1% | EDGAR |
| SC 13D/A | 2013-11-19 | DAVIS SELECTED ADVISERS | IRON MOUNTAIN INC | 9,501,649 | 5.0% | EDGAR |
| SC 13D/A | 2013-04-19 | DAVIS SELECTED ADVISERS | IRON MOUNTAIN INC | 10,510,502 | 5.5% | EDGAR |
| SC 13G/A | 2013-02-14 | HIGHFIELDS CAPITAL MANAGEMENT LP | IRON MOUNTAIN INC | 9,737,184 | 5.6% | EDGAR |
| SC 13G/A | 2013-02-13 | RYAN VINCENT J | IRON MOUNTAIN INC | 17,268,936,845 | 9.1% | EDGAR |
| SC 13G/A | 2013-02-13 | Capital World Investors | IRON MOUNTAIN INC | 22,478,368 | 11.8% | EDGAR |
| SC 13G/A | 2013-02-11 | VANGUARD GROUP INC | IRON MOUNTAIN INC | 8,963,634 | 4.7% | EDGAR |
| SC 13G/A | 2013-01-31 | JANUS CAPITAL MANAGEMENT LLC | IRON MOUNTAIN INC | 6,068,476 | 3.5% | EDGAR |
| SC 13D/A | 2012-12-31 | DAVIS SELECTED ADVISERS | IRON MOUNTAIN INC | 12,343,057 | 6.5% | EDGAR |