Iron Mountain Inc (IRM) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

297,816,000Shares Outstanding
251,295,434Shares held by institutions
$31,778,820,584Value of institutional holdings
84.38%Institutional ownership %
22.96%Shares Changed QoQ
1,064No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Iron Mountain Inc (NYSE:IRM) is held by 971 institutional investors per 13F filings through December 2025.

1,785 Institutional Holders

251,295,434 Total Shares Held
Download Data
Owner Name Date Shares Held Change (QoQ) Change (%) Value (USD)
VANGUARD GROUP INC 31 Dec, 2025 46,627,483 -625,617 -1.32% $3,867,749,715.00
BlackRock, Inc. 31 Dec, 2025 33,021,354 101,696 0.31% $3,372,801,141.00
BlackRock, Inc. 31 Dec, 2025 32,919,658 1,210,594 3.82% $2,730,685,613.00
VANGUARD PORTFOLIO MANAGEMENT LLC 31 Dec, 2025 25,015,557 25,015,557 0.00% $2,555,088,992.00
Cohen & Steers, Inc. 31 Dec, 2025 18,903,716 3,155,034 20.03% $1,568,110.00
VANGUARD CAPITAL MANAGEMENT LLC 31 Dec, 2025 18,758,889 18,758,889 0.00% $1,916,032,922.00
State Street Corp 31 Dec, 2025 17,551,633 662,835 3.92% $1,807,660,367.00
State Street Corp 31 Dec, 2025 16,888,798 -242,989 -1.42% $1,415,001,718.00
Cohen & Steers, Inc. 31 Dec, 2025 16,169,341 -2,734,375 -14.46% $1,651,537.00
GEODE CAPITAL MANAGEMENT, LLC 31 Dec, 2025 8,486,127 193,474 2.33% $863,699,269.00
GEODE CAPITAL MANAGEMENT, LLC 31 Dec, 2025 8,292,653 102,073 1.25% $685,374,233.00
FMR LLC 31 Dec, 2025 7,984,304 126,212 1.61% $662,298,027.00
FMR LLC 31 Dec, 2025 7,484,398 -499,906 -6.26% $764,456,401.00
Morgan Stanley 31 Dec, 2025 4,652,247 1,053,274 29.27% $475,180,655.00
Principal Financial Group Inc 31 Dec, 2025 4,566,093 358,497 8.52% $466,382,473.00
DIMENSIONAL FUND ADVISORS LP 31 Dec, 2025 4,552,286 122,927 2.78% $464,930,903.00
NORGES BANK 31 Dec, 2025 4,447,133 4,447,133 0.00% $368,889,682.00
DIMENSIONAL FUND ADVISORS LP 31 Dec, 2025 4,429,359 81,320 1.87% $367,418,097.00
Invesco Ltd. 31 Dec, 2025 4,417,367 -649,149 -12.81% $366,420,630.00
Principal Financial Group Inc 31 Dec, 2025 4,207,596 1,680,438 66.50% $349,020,857.00