Iron Mountain (IRM) Institutional Ownership

$115.64 -1.76 (-1.50%)

As of 08/31/2026 03:58 PM Eastern

Current Institutional Ownership Percentage: 80.13%
Number of Institutional Buyers (last 12 months): 573
Total Institutional Inflows (last 12 months): $16.00B

Number of Institutional Sellers (last 12 months): 421
Total Institutional Outflows (last 12 months): $1.57B

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IRM Institutional Buying and Selling by Quarter

Iron Mountain Major Shareholders & Ownership History

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Reporting Date	Major Shareholder Name	Shares Held	Market Value	% of Portfolio	Quarterly Change in Shares	Ownership in Company
8/27/2026	Corient Private Wealth LP	216,659	$27.37M	0.0%	+2.0%	0.073%
8/26/2026	Amundi	1,168,430	$147.58M	0.0%	+7.0%	0.392%
8/26/2026	Brown Financial Advisors	2,580	$326K	0.1%	+3.6%	0.001%
8/26/2026	HighTower Advisors LLC	105,399	$13.31M	0.0%	-0.2%	0.035%
8/25/2026	VIRGINIA RETIREMENT SYSTEMS ET Al	441,803	$55.80M	0.3%	N/A	0.148%
8/24/2026	California State Teachers Retirement System	54,885,358	$6.93B	0.0%	+12,879.2%	18.436%
8/23/2026	Ameritas Advisory Services LLC	18,870	$2.38M	0.0%	+245.7%	0.006%
8/23/2026	Wedmont Private Capital	4,288	$521K	0.0%	+18.0%	0.001%
8/23/2026	Widmann Financial Services Inc.	11,925	$1.51M	0.8%	-1.6%	0.004%
8/23/2026	Ameliora Wealth Management Ltd.	2,100	$265K	0.1%	-32.3%	0.001%
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8/23/2026	HB Wealth Management LLC	15,577	$1.97M	0.0%	+1.1%	0.005%
8/23/2026	Saudi Central Bank	20,823	$2.63M	0.0%	+90.8%	0.007%
8/22/2026	Compass Financial Management LLC	527	$66K	0.0%	N/A	0.000%
8/22/2026	AlphaGrep UK Ltd	4,136	$522K	0.2%	N/A	0.001%
8/22/2026	William John Sempolinski	1,900	$240K	0.1%	N/A	0.001%
8/22/2026	Markowski Investments	267	$34K	0.0%	N/A	0.000%
8/22/2026	Munich Reinsurance Co Stock Corp in Munich	32,749	$4.14M	0.1%	N/A	0.011%
8/22/2026	Raiffeisen Bank International AG	54,892	$7.13M	0.1%	-37.4%	0.018%
8/22/2026	Investor s Fiduciary Advisor Network LLC	16,270	$2.06M	0.7%	-21.1%	0.005%
8/22/2026	Syon Capital LLC	8,540	$1.08M	0.0%	+2.2%	0.003%
8/22/2026	TD Waterhouse Canada Inc.	9,519	$1.20M	0.0%	-10.3%	0.003%
8/22/2026	Concurrent Investment Advisors LLC	11,121	$1.41M	0.0%	+71.0%	0.004%
8/22/2026	NEOS Investment Management LLC	110,692	$13.98M	0.1%	+9.5%	0.037%
8/21/2026	Continuum Advisory LLC	3,820	$483K	0.0%	+12.0%	0.001%
8/21/2026	Nykredit A S	118,721	$15.00M	0.0%	N/A	0.040%
8/21/2026	B. Metzler seel. Sohn & Co. AG	34,219	$4.32M	0.0%	+23.0%	0.011%
8/21/2026	Natural Investments LLC	3,569	$450K	0.1%	-13.1%	0.001%
8/21/2026	Beacon Financial Advisory LLC	10,443	$1.32M	0.3%	-1.7%	0.004%
8/21/2026	Tsfg LLC	440	$56K	0.0%	N/A	0.000%
8/21/2026	Independence Bank of Kentucky	5,399	$682K	0.1%	-11.8%	0.002%
8/20/2026	Proficio Capital Partners LLC	2,229	$282K	0.0%	N/A	0.001%
8/20/2026	Renasant Bank	1,638	$207K	0.1%	N/A	0.001%
8/20/2026	Ancora Advisors LLC	19,766	$2.50M	0.0%	-5.4%	0.007%
8/20/2026	Sigma Planning Corp	2,468	$312K	0.0%	-7.7%	0.001%
8/20/2026	Benjamin Edwards Inc.	21,006	$2.65M	0.0%	-3.7%	0.007%
8/20/2026	GTS Securities LLC	4,367	$552K	0.0%	-40.4%	0.001%
8/20/2026	Northwestern Mutual Wealth Management Co.	67,203	$8.49M	0.0%	+0.8%	0.023%
8/20/2026	Wedbush Securities Inc.	7,038	$889K	0.0%	-21.9%	0.002%
8/19/2026	UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	3,193,560	$403.38M	0.1%	+29,674.0%	1.073%
8/19/2026	New Mexico Educational Retirement Board	14,640	$1.85M	0.0%	+5.8%	0.005%
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8/19/2026	Royal London Asset Management Ltd.	141,105	$17.82M	0.0%	-1.1%	0.047%
8/19/2026	Mufg Securities Americas Inc.	8,962	$1.13M	0.1%	+9.5%	0.003%
8/19/2026	Van ECK Associates Corp	86,504	$10.93M	0.0%	+3.5%	0.029%
8/19/2026	Nissay Asset Management Corp Japan	86,438	$10.92M	0.0%	+2.0%	0.029%
8/19/2026	Wellington Management Group LLP	512,906	$64.79M	0.0%	+47.4%	0.172%
8/19/2026	Archer Investment Corp	5,800	$733K	0.1%	N/A	0.002%
8/19/2026	Kingsview Wealth Management LLC	4,265	$539K	0.0%	N/A	0.001%
8/18/2026	Beacon Pointe Advisors LLC	13,845	$1.75M	0.0%	N/A	0.005%
8/18/2026	Livforsakringsbolaget Skandia Omsesidigt	1,461	$185K	0.0%	N/A	0.000%
8/18/2026	Strait & Sound Wealth Management LLC	8,038	$1.02M	0.4%	N/A	0.003%
8/18/2026	Rakuten Investment Management Inc.	48,661	$6.32M	0.0%	N/A	0.016%
8/18/2026	RB Capital Management LLC	46,766	$5.91M	1.2%	N/A	0.016%
8/18/2026	Glenview Trust Co	11,016	$1.39M	0.0%	N/A	0.004%
8/18/2026	Comprehensive Money Management Services LLC	12,851	$1.62M	1.0%	N/A	0.004%
8/18/2026	Empowered Funds LLC	14,840	$1.87M	0.0%	N/A	0.005%
8/18/2026	United Capital Financial Advisors LLC	172,265	$21.76M	0.1%	N/A	0.058%
8/18/2026	Caitlin John LLC	595	$75K	0.0%	N/A	0.000%
8/18/2026	Equitable Holdings Inc.	5,770	$729K	0.0%	N/A	0.002%
8/18/2026	Centaurus Financial Inc.	6,589	$832K	0.0%	N/A	0.002%
8/18/2026	Coastal Bridge Advisors LLC	3,181	$402K	0.0%	N/A	0.001%
8/18/2026	Public Employees Retirement System of Ohio	422,586	$53.38M	0.2%	N/A	0.142%
8/18/2026	MASTERINVEST Kapitalanlage GmbH	21,228	$2.68M	0.2%	N/A	0.007%
8/17/2026	Proficio Capital Partners LLC	2,229	$282K	0.0%	N/A	0.001%
8/17/2026	Adelante Capital Management LLC	325,641	$41.13M	2.7%	N/A	0.109%
8/17/2026	Corient Private Wealth LP	224,512	$28.36M	0.0%	N/A	0.075%
8/17/2026	Perennial Investment Advisors LLC	3,198	$404K	0.0%	N/A	0.001%
8/17/2026	Pinnacle Family Advisors LLC	5,866	$741K	0.3%	N/A	0.002%
8/17/2026	Ausdal Financial Partners Inc.	4,070	$514K	0.0%	N/A	0.001%
8/17/2026	Bamco Inc. NY	310,721	$39.25M	0.1%	N/A	0.104%
8/17/2026	Bank of America Corp DE	1,118,827	$141.32M	0.0%	N/A	0.376%
8/15/2026	Freestone Grove Partners LP	4,753	$600K	0.0%	N/A	0.002%
8/15/2026	Jupiter Topco LLC	33,266	$4.20M	0.0%	N/A	0.011%
8/14/2026	Hsbc Holdings PLC	1,347,871	$170.31M	0.1%	+5.9%	0.453%
8/14/2026	Canada Pension Plan Investment Board	29,362	$3.71M	0.0%	N/A	0.010%
8/14/2026	Legal & General Group Plc	3,244,741	$409.84M	0.1%	N/A	1.090%
8/14/2026	The Manufacturers Life Insurance Company	166,497	$21.03M	0.0%	N/A	0.056%
8/14/2026	Jones Financial Companies Lllp	697	$88K	0.0%	N/A	0.000%
8/14/2026	Fiduciary Financial Advisors	1,466	$185K	0.0%	N/A	0.000%
8/14/2026	L2 Asset Management LLC	1,591	$201K	0.0%	N/A	0.001%
8/14/2026	Cetera Trust Company N.A	3,285	$415K	0.2%	N/A	0.001%
8/14/2026	Aberdeen Wealth Management LLC	1,421	$179K	0.1%	N/A	0.000%
8/14/2026	Algert Global LLC	4,130	$522K	0.0%	N/A	0.001%
8/13/2026	Investor s Fiduciary Advisor Network LLC	16,270	$2.06M	0.7%	N/A	0.005%
8/13/2026	Cibc World Market Inc.	112,049	$14.15M	0.0%	N/A	0.038%
8/13/2026	OMERS ADMINISTRATION Corp	116,430	$14.71M	0.1%	N/A	0.039%
8/13/2026	Osmosis Investment Management UK Ltd	19,143	$2.42M	0.1%	N/A	0.006%
8/13/2026	Sanctuary Advisors LLC	136,968	$17.30M	0.1%	N/A	0.046%
8/13/2026	Connor Clark & Lunn Investment Management Ltd.	17,996	$2.27M	0.0%	N/A	0.006%
8/13/2026	Bank of Nova Scotia	79,661	$10.10M	0.0%	N/A	0.027%
8/12/2026	Compass Financial Management LLC	527	$66K	0.0%	N/A	0.000%
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8/12/2026	Daiichi Life Insurance Co. Ltd.	12,754	$1.61M	0.0%	N/A	0.004%
8/12/2026	Commerce Bank	16,371	$2.07M	0.0%	N/A	0.006%
8/12/2026	Northwestern Mutual Wealth Management Co.	67,203	$8.49M	0.0%	N/A	0.023%
8/12/2026	Varma Mutual Pension Insurance Co	67,938	$8.58M	0.0%	N/A	0.023%
8/12/2026	Emerald Investment Advisers LLC	18,535	$2.34M	0.2%	N/A	0.006%
8/12/2026	Westpac Banking Corp	25,195	$3.18M	0.2%	N/A	0.008%
8/12/2026	Korea Investment CORP	218,594	$27.61M	0.1%	N/A	0.073%
8/12/2026	EP Wealth Advisors LLC	11,861	$1.50M	0.0%	N/A	0.004%
8/12/2026	Ieq Capital LLC	97,425	$12.31M	0.1%	N/A	0.033%
8/12/2026	Callan Family Office LLC	9,041	$1.14M	0.0%	N/A	0.003%

IRM Institutional Ownership - Frequently Asked Questions

During the previous two years, 1,152 institutional investors and hedge funds held shares of Iron Mountain. The most heavily invested institutionals were California State Teachers Retirement System ($6.93B), BlackRock Inc. ($4.24B), Vanguard Group Inc. ($3.87B), Cohen & Steers Inc. ($1.57B), State Street Corp ($1.42B), Geode Capital Management LLC ($685.37M), and Principal Financial Group Inc. ($466.38M).Learn more on Iron Mountain's institutional investors.

80.13% of Iron Mountain's stock is owned by institutional investors. Learn more on IRM's institutional investor holdings.

Of the 954 institutional investors that purchased Iron Mountain's stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: California State Teachers Retirement System ($54.48M), BlackRock Inc. ($33.57M), Norges Bank ($11.85M), UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC ($8.56M), Wealthfront Advisers LLC ($6.87M), Legal & General Group Plc ($3.48M), and Cohen & Steers Inc. ($3.16M).

Institutional investors have bought a total of 134,809,530 shares in the last 24 months. This purchase volume represents approximately $16.00B in transactions.

Of the 421 institutional investors that sold Iron Mountain's stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC ($3.16M), Pictet Asset Management Holding SA ($1.60M), Wellington Management Group LLP ($1.39M), Royal Bank of Canada ($1.01M), Amundi ($757.63K), Invesco Ltd. ($649.15K), and Vanguard Group Inc. ($625.62K).

Institutional investors have sold a total of 17,182,170 shares in the last 24 months. This volume of shares sold represents approximately $1.57B in transactions.

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Institutional ownership data for NYSE:IRM is compiled from quarterly 13F filings submitted to the U.S. Securities and Exchange Commission (SEC), with the most recent received on 8/27/2026. New 13F filings are added each quarter as they're published.

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Iron Mountain (IRM) Institutional Ownership

IRM Institutional Buying and Selling by Quarter

Iron Mountain Major Shareholders & Ownership History

IRM Institutional Ownership - Frequently Asked Questions

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Iron Mountain (IRM) Institutional Ownership

Institutional Ownership Changes (13F Filings) for Iron Mountain (NYSE:IRM)

IRM Institutional Buying and Selling by Quarter

Iron Mountain Major Shareholders & Ownership History

IRM Institutional Ownership - Frequently Asked Questions

Who are the largest shareholders of IRM shares?

What percentage of Iron Mountain's stock is owned by institutional investors?

Which institutional investors have been buying Iron Mountain's stock?

How much institutional buying is happening at Iron Mountain?

Which of Iron Mountain's major shareholders have been selling company stock?

How much institutional selling is happening at Iron Mountain?

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