Iron Mountain Inc (IRM) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

297,816,000Shares Outstanding
256,138,798Shares held by institutions
$31,909,771,924Value of institutional holdings
86.01%Institutional ownership %
2.60%Shares Changed QoQ
971No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Iron Mountain Inc (NYSE:IRM) has 971 institutional investors with active 13F positions as of December 2025.

1,064 Institutional Holders

256,138,798 Total Shares Held
Download Data
Owner Name Date Shares Held Change (QoQ) Change (%) Value (USD)
BlackRock, Inc. 31 Mar, 2026 33,021,354 101,696 0.31% $3,372,801,141.00
VANGUARD PORTFOLIO MANAGEMENT LLC 31 Mar, 2026 25,015,557 25,015,557 0.00% $2,555,088,992.00
VANGUARD CAPITAL MANAGEMENT LLC 31 Mar, 2026 18,758,889 18,758,889 0.00% $1,916,032,922.00
State Street Corp 31 Mar, 2026 17,551,633 662,835 3.92% $1,807,660,367.00
Cohen & Steers, Inc. 31 Mar, 2026 16,169,341 -2,734,375 -14.46% $1,651,537.00
GEODE CAPITAL MANAGEMENT, LLC 31 Mar, 2026 8,486,127 193,474 2.33% $863,699,269.00
FMR LLC 31 Mar, 2026 7,484,398 -499,906 -6.26% $764,456,401.00
Morgan Stanley 31 Mar, 2026 4,652,247 1,053,274 29.27% $475,180,655.00
Principal Financial Group Inc 31 Mar, 2026 4,566,093 358,497 8.52% $466,382,473.00
DIMENSIONAL FUND ADVISORS LP 31 Mar, 2026 4,552,286 122,927 2.78% $464,930,903.00
Northern Trust Corp 31 Mar, 2026 4,150,486 -2,083 -0.05% $423,930,638.00
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 31 Mar, 2026 4,013,007 132,732 3.42% $409,888,535.00
Invesco Ltd. 31 Mar, 2026 3,921,521 -495,846 -11.22% $400,544,198.00
Legal & General Group Plc 31 Mar, 2026 3,135,074 -221,346 -6.59% $320,216,461.00
Daiwa Securities Group Inc. 31 Mar, 2026 3,107,440 -546,646 -14.96% $317,393,921.00
DEUTSCHE BANK AG\ 31 Mar, 2026 3,092,084 550,092 21.64% $315,825,461.00
Prudential Financial Inc 31 Mar, 2026 2,416,063 105,582 4.57% $246,776,675.00
CENTERSQUARE INVESTMENT MANAGEMENT LLC 31 Mar, 2026 2,310,045 -321,408 -12.21% $235,947,996.00
Goldman Sachs Group Inc 31 Mar, 2026 2,216,672 -833,127 -27.32% $226,410,923.00
Jpmorgan Chase & Co 31 Mar, 2026 2,123,358 195,423 10.14% $207,239,854.00