Iron Mountain Inc (IRM) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

297,816,000Shares Outstanding

259,177,249Shares held by institutions

$29,180,766,465Value of institutional holdings

87.03%Institutional ownership %

3.23%Shares Changed QoQ

974No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Iron Mountain Inc (NYSE:IRM) showed up in the 13F filings of 971 institutional investors as of December 2025.

They owned 86.0% of outstanding stock in December 2025, up from 85.5% the prior quarter.
They increased total shares held in IRM by 2.6% quarter over quarter, and investors in Iron Mountain decreased 6.81% from a year ago.
Of these 971 holders, 422 added to their stakes in Iron Mountain, 404 trimmed positions, and 145 made no changes.
The aggregate institutional position in Iron Mountain amounted to 256.14Mn shares as of December 2025, up by 6.48Mn shares quarter on quarter, and up 10.64Mn shares year over year.
Pictet Asset Management Holding SA leads ownership in IRM with 864.74K shares as of December 31, 2025, equal to 0.29% of outstanding shares.
The largest buyers of Iron Mountain for the quarter ending December 2025 were Adams Diversified Equity Fund, Inc. (80.8K), SALEM INVESTMENT COUNSELORS INC (78.12K), Oak Thistle LLC (53.64K), WEALTH ENHANCEMENT ADVISORY SERVICES, LLC (53.41K), OP Asset Management Ltd (28.48K).
Leading sellers of Iron Mountain shares for the quarter ending December 2025 were Pictet Asset Management Holding SA (1.43Mn), STRS OHIO (126.31K), Brookstone Capital Management (47.0K), Border to Coast Pensions Partnership Ltd (30.0K), FORESIGHT CAPITAL MANAGEMENT ADVISORS, INC. (16.47K).
Business Quant data shows the 10 biggest positions in Iron Mountain as of December 2025 are held by Pictet Asset Management Holding SA (864.74K), Border to Coast Pensions Partnership Ltd (470.0K), STRS OHIO (287.82K), Retirement Systems of Alabama (227.8K), Brookstone Capital Management (188.93K), State of Alaska, Department of Revenue (177.71K), TECTONIC ADVISORS LLC (165.81K), Vert Asset Management LLC (146.41K), TCV Trust & Wealth Management, Inc. (141.54K), Sumitomo Mitsui DS Asset Management Company, Ltd (109.72K).

982 Institutional Holders

259,177,249 Total Shares Held

Rows:

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	32,919,658	1,210,594	3.82%	$2,730,685,613.00
Cohen & Steers, Inc.	31 Dec, 2025	18,903,716	3,155,034	20.03%	$1,568,110.00
State Street Corp	31 Dec, 2025	16,888,798	-242,989	-1.42%	$1,415,001,718.00
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
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
Northern Trust Corp	31 Dec, 2025	4,152,569	121,003	3.00%	$344,455,599.00
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	31 Dec, 2025	3,880,275	206,030	5.61%	$321,868,811.00
Daiwa Securities Group Inc.	31 Dec, 2025	3,654,086	502,998	15.96%	$303,106.00
Morgan Stanley	31 Dec, 2025	3,598,973	-12,426	-0.34%	$298,534,997.00
Legal & General Group Plc	31 Dec, 2025	3,356,420	140,965	4.38%	$278,415,040.00
Goldman Sachs Group Inc	31 Dec, 2025	3,049,799	1,695,702	125.23%	$252,980,835.00
Contour Asset Management LLC	31 Dec, 2025	2,832,182	-333,648	-10.54%	$234,929,497.00
CENTERSQUARE INVESTMENT MANAGEMENT LLC	31 Dec, 2025	2,631,453	116,989	4.65%	$218,279,027.00
DEUTSCHE BANK AG\	31 Dec, 2025	2,541,992	-348,459	-12.06%	$210,858,237.00
Prudential Financial Inc	31 Dec, 2025	2,310,481	196,864	9.31%	$191,654,398.00

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