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Iron Mountain (IRM) Institutional Ownership

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$115.12 +2.23 (+1.97%)
Closing price 09/11/2026 03:58 PM Eastern
Extended Trading
$115.88 +0.76 (+0.66%)
As of 09/11/2026 07:56 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Massive. Learn more.
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Institutional Ownership Changes (13F Filings) for Iron Mountain (NYSE:IRM)

Current
Institutional Ownership
Percentage
80.13%
Number of
Institutional Buyers
(last 12 months)
576
Total
Institutional Inflows
(last 12 months)
$16.02B
Number of
Institutional Sellers
(last 12 months)
422
Total
Institutional Outflows
(last 12 months)
$1.58B
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IRM Institutional Buying and Selling by Quarter

Iron Mountain Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
9/9/2026 Sequoia Financial Advisors LLC12,408$1.57M0.0%+18.6%0.004%
9/9/2026 Community Bank of Raymore17,301$2.19M1.2%+9.0%0.006%
9/9/2026 National Pension Service454,815$57.45M0.0%+5.9%0.153%
9/9/2026 Engineers Gate Manager LP5,614$709K0.0%-91.5%0.002%
9/9/2026 Pinnacle Wealth Management Advisory Group LLC1,724$218K0.0%N/A0.001%
9/9/2026 Integrated Wealth Concepts LLC16,688$2.11M0.0%+2.0%0.006%
9/9/2026 RFG Advisory LLC16,910$2.14M0.0%-0.5%0.006%
9/9/2026 NewEdge Advisors LLC56,273$7.11M0.0%+34.6%0.019%
9/9/2026 IFP Advisors Inc2,729$345K0.0%+24.0%0.001%
9/9/2026 Baird Financial Group Inc.47,658$6.02M0.0%+11.6%0.016%
9/9/2026 One Charles Private Wealth Services LLC14,538$1.84M0.4%-2.9%0.005%
9/8/2026 Allworth Financial LP74,559$9.42M0.0%-2.3%0.025%
9/8/2026 Arizona State Retirement System85,291$10.77M0.1%+6.1%0.029%
9/8/2026 Waverly Advisors LLC37,733$4.77M0.0%+4.8%0.013%
9/8/2026 Nykredit A S104,462$13.20M0.0%N/A0.035%
9/4/2026 Parkside Financial Bank & Trust4,184$528K0.0%+179.1%0.001%
8/27/2026 Corient Private Wealth LP216,659$27.37M0.0%+2.0%0.073%
8/26/2026 Amundi1,168,430$147.58M0.0%+7.0%0.392%
8/26/2026 Brown Financial Advisors2,580$326K0.1%+3.6%0.001%
8/26/2026 HighTower Advisors LLC105,399$13.31M0.0%-0.2%0.035%
8/25/2026 VIRGINIA RETIREMENT SYSTEMS ET Al441,803$55.80M0.3%N/A0.148%
8/24/2026 California State Teachers Retirement System54,885,358$6.93B0.0%+12,879.2%18.436%
8/23/2026 Ameritas Advisory Services LLC18,870$2.38M0.0%+245.7%0.006%
8/23/2026 Wedmont Private Capital4,288$521K0.0%+18.0%0.001%
8/23/2026 Widmann Financial Services Inc.11,925$1.51M0.8%-1.6%0.004%
8/23/2026 Ameliora Wealth Management Ltd.2,100$265K0.1%-32.3%0.001%
8/23/2026 HB Wealth Management LLC15,577$1.97M0.0%+1.1%0.005%
8/23/2026 Saudi Central Bank20,823$2.63M0.0%+90.8%0.007%
8/22/2026 Compass Financial Management LLC527$66K0.0%N/A0.000%
8/22/2026 AlphaGrep UK Ltd4,136$522K0.2%N/A0.001%
8/22/2026 William John Sempolinski1,900$240K0.1%N/A0.001%
8/22/2026 Markowski Investments267$34K0.0%N/A0.000%
8/22/2026 Munich Reinsurance Co Stock Corp in Munich32,749$4.14M0.1%N/A0.011%
8/22/2026 Raiffeisen Bank International AG54,892$7.13M0.1%-37.4%0.018%
8/22/2026 Investor s Fiduciary Advisor Network LLC16,270$2.06M0.7%-21.1%0.005%
8/22/2026 Syon Capital LLC8,540$1.08M0.0%+2.2%0.003%
8/22/2026 TD Waterhouse Canada Inc.9,519$1.20M0.0%-10.3%0.003%
8/22/2026 Concurrent Investment Advisors LLC11,121$1.41M0.0%+71.0%0.004%
8/22/2026 NEOS Investment Management LLC110,692$13.98M0.1%+9.5%0.037%
8/21/2026 Continuum Advisory LLC3,820$483K0.0%+12.0%0.001%
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8/21/2026 Nykredit A S118,721$15.00M0.0%N/A0.040%
8/21/2026 B. Metzler seel. Sohn & Co. AG34,219$4.32M0.0%+23.0%0.011%
8/21/2026 Natural Investments LLC3,569$450K0.1%-13.1%0.001%
8/21/2026 Beacon Financial Advisory LLC10,443$1.32M0.3%-1.7%0.004%
8/21/2026 Tsfg LLC440$56K0.0%N/A0.000%
8/21/2026 Independence Bank of Kentucky5,399$682K0.1%-11.8%0.002%
8/20/2026 Proficio Capital Partners LLC2,229$282K0.0%N/A0.001%
8/20/2026 Renasant Bank1,638$207K0.1%N/A0.001%
8/20/2026 Ancora Advisors LLC19,766$2.50M0.0%-5.4%0.007%
8/20/2026 Sigma Planning Corp2,468$312K0.0%-7.7%0.001%
8/20/2026 Benjamin Edwards Inc.21,006$2.65M0.0%-3.7%0.007%
8/20/2026 GTS Securities LLC4,367$552K0.0%-40.4%0.001%
8/20/2026 Northwestern Mutual Wealth Management Co.67,203$8.49M0.0%+0.8%0.023%
8/20/2026 Wedbush Securities Inc.7,038$889K0.0%-21.9%0.002%
8/19/2026 UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC3,193,560$403.38M0.1%+29,674.0%1.073%
8/19/2026 New Mexico Educational Retirement Board14,640$1.85M0.0%+5.8%0.005%
8/19/2026 Royal London Asset Management Ltd.141,105$17.82M0.0%-1.1%0.047%
8/19/2026 Mufg Securities Americas Inc.8,962$1.13M0.1%+9.5%0.003%
8/19/2026 Van ECK Associates Corp86,504$10.93M0.0%+3.5%0.029%
8/19/2026 Nissay Asset Management Corp Japan86,438$10.92M0.0%+2.0%0.029%
8/19/2026 Wellington Management Group LLP512,906$64.79M0.0%+47.4%0.172%
8/19/2026 Archer Investment Corp5,800$733K0.1%N/A0.002%
8/19/2026 Kingsview Wealth Management LLC4,265$539K0.0%N/A0.001%
8/18/2026 Beacon Pointe Advisors LLC13,845$1.75M0.0%N/A0.005%
8/18/2026 Livforsakringsbolaget Skandia Omsesidigt1,461$185K0.0%N/A0.000%
8/18/2026 Strait & Sound Wealth Management LLC8,038$1.02M0.4%N/A0.003%
8/18/2026 Rakuten Investment Management Inc.48,661$6.32M0.0%N/A0.016%
8/18/2026 RB Capital Management LLC46,766$5.91M1.2%N/A0.016%
8/18/2026 Glenview Trust Co11,016$1.39M0.0%N/A0.004%
8/18/2026 Comprehensive Money Management Services LLC12,851$1.62M1.0%N/A0.004%
8/18/2026 Empowered Funds LLC14,840$1.87M0.0%N/A0.005%
8/18/2026 United Capital Financial Advisors LLC172,265$21.76M0.1%N/A0.058%
8/18/2026 Caitlin John LLC595$75K0.0%N/A0.000%
8/18/2026 Equitable Holdings Inc.5,770$729K0.0%N/A0.002%
8/18/2026 Centaurus Financial Inc.6,589$832K0.0%N/A0.002%
8/18/2026 Coastal Bridge Advisors LLC3,181$402K0.0%N/A0.001%
8/18/2026 Public Employees Retirement System of Ohio422,586$53.38M0.2%N/A0.142%
8/18/2026 MASTERINVEST Kapitalanlage GmbH21,228$2.68M0.2%N/A0.007%
8/17/2026 Proficio Capital Partners LLC2,229$282K0.0%N/A0.001%
8/17/2026 Adelante Capital Management LLC325,641$41.13M2.7%N/A0.109%
8/17/2026 Corient Private Wealth LP224,512$28.36M0.0%N/A0.075%
8/17/2026 Perennial Investment Advisors LLC3,198$404K0.0%N/A0.001%
8/17/2026 Pinnacle Family Advisors LLC5,866$741K0.3%N/A0.002%
8/17/2026 Ausdal Financial Partners Inc.4,070$514K0.0%N/A0.001%
8/17/2026 Bamco Inc. NY310,721$39.25M0.1%N/A0.104%
8/17/2026 Bank of America Corp DE1,118,827$141.32M0.0%N/A0.376%
8/15/2026 Freestone Grove Partners LP4,753$600K0.0%N/A0.002%
8/15/2026 Jupiter Topco LLC33,266$4.20M0.0%N/A0.011%
8/14/2026 Hsbc Holdings PLC1,347,871$170.31M0.1%+5.9%0.453%
8/14/2026 Canada Pension Plan Investment Board29,362$3.71M0.0%N/A0.010%
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8/14/2026 Legal & General Group Plc3,244,741$409.84M0.1%N/A1.090%
8/14/2026 The Manufacturers Life Insurance Company166,497$21.03M0.0%N/A0.056%
8/14/2026 Jones Financial Companies Lllp697$88K0.0%N/A0.000%
8/14/2026 Fiduciary Financial Advisors1,466$185K0.0%N/A0.000%
8/14/2026 L2 Asset Management LLC1,591$201K0.0%N/A0.001%
8/14/2026 Cetera Trust Company N.A3,285$415K0.2%N/A0.001%
8/14/2026 Aberdeen Wealth Management LLC1,421$179K0.1%N/A0.000%
8/14/2026 Algert Global LLC4,130$522K0.0%N/A0.001%
8/13/2026 Investor s Fiduciary Advisor Network LLC16,270$2.06M0.7%N/A0.005%
8/13/2026 Cibc World Market Inc.112,049$14.15M0.0%N/A0.038%


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 955 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 134,972,012 shares in the last 24 months. This purchase volume represents approximately $16.02B in transactions.

Of the 422 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 17,243,257 shares in the last 24 months. This volume of shares sold represents approximately $1.58B 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 9/9/2026. New 13F filings are added each quarter as they're published.
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