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Iron Mountain Inc

IRM
Exchange
NYSE
Industry
Real Estate Investment Trusts
SEC CIK
0001020569

In the last 90 days, Iron Mountain Inc insiders filed 0 open-market purchases and 6 sales; 1,173 institutions reported holding it in 13F filings for Q2 2026, worth $32.4B in total; no superinvestor holds it.

Q4 2025 vs. Q3 2025

How the institutions holding Iron Mountain Inc changed between Q3 2025 and Q4 2025.

All holders in Q4 2025All holders in Q3 2025

13F holders of IRM: Q3 2025 compared with Q4 2025
MeasureQ3 2025Of which not filed for Q4 2025Q4 2025Change
Holders1,017221,011+16
Shares250.3M488.7K257.3M+7.46M (+3.0%)
Value$25.5B$49.8M$21.4B−$4.12B (−16.2%)

22 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (123)

Institutions that held Iron Mountain Inc at the end of Q4 2025 but not at the end of Q3 2025.

Showing the largest 100 of 123 by value.

Institutions new to IRM in Q4 2025
InstitutionSharesValue% of portfolio
Norges Bank4,447,133$368.9M0.04%
Two Sigma Investments, LP290,160$24.1M0.04%
Apollo Management Holdings, L.P.265,539$22.0M0.22%
Americana Partners, LLC241,349$20.0M0.55%
Cander Asset Management LP202,738$16.8M3.11%
SG Americas Securities, LLC137,582$11.4M0.02%
CIBC World Markets Corp115,456$9.58M0.05%
Nomura Asset Management International Inc.84,223$6.99M0.01%
Pinebridge Investments LLC78,410$6.50M0.05%
Eurizon Capital SGR S.p.A.74,091$6.15M0.02%
Easterly Investment Partners LLC73,516$6.10M0.37%
PFA Pension, Forsikringsaktieselskab63,474$5.29M0.02%
PensionDanmark Pensionsforsikringsaktieselskab57,150$4.74M0.04%
Reaves W H & Co Inc53,900$4.47M0.08%
Fjarde Ap-Fonden /Fourth Swedish National Pension Fund51,326$4.26M0.04%
Twinbeech Capital LP45,900$3.81M0.27%
Uniplan Investment Counsel, Inc.30,327$2.52M0.25%
Buckland Partners Management Co LLC30,000$2.51M1.40%
Y-Intercept (Hong Kong) Ltd24,272$2.01M0.05%
Pasadena Private Wealth, LLC23,564$1.95M0.27%
Tudor Investment Corp Et Al22,190$1.84M0.01%
Meridian Wealth Advisors, LLC20,314$1.69M0.23%
Osmosis Investment Management UK Ltd17,530$1.47M0.04%
Capital Financial Group Inc16,995$1.41M0.79%
Stevens Capital Management LP15,214$1.26M0.44%
Wiregrass Investment Management LLC12,284$1.02M0.85%
EP Wealth Advisors, LLC11,863$984.0K0.01%
Mitchell McLeod Pugh & Williams Inc10,200$977.0K0.14%
J.M. Arbour, LLC10,860$900.9K0.90%
Unifi Asset Management LP10,593$878.7K0.95%
EntryPoint Capital, LLC10,503$871.2K0.34%
Glenmede Trust Co NA10,408$863.3K0.00%
North Dakota State Investment Board10,059$834.4K0.03%
Munich Reinsurance Co Stock Corp in Munich9,791$816.2K0.02%
Havemeyer Place LP9,388$778.7K0.15%
V-Square Quantitative Management LLC9,178$761.3K0.08%
Keating Financial Advisory Services, Inc.7,885$654.1K0.09%
AlphaGrep UK Ltd6,538$542.3K0.18%
Advisory Advocates, LLC6,145$509.7K0.51%
Entropy Technologies, LP5,614$465.7K0.03%
Dynamic Technology Lab Private Ltd5,387$447.0K0.10%
PEAK6 LLC5,317$441.0K0.01%
Simplicity Wealth,LLC5,294$439.2K0.03%
Cfo Capital Management LLC5,039$418.0K0.31%
M&G Plc4,963$411.9K0.00%
Atlas Capital Advisors LLC4,742$393.3K0.04%
Norden Group LLC4,681$388.3K0.04%
Prelude Capital Management, LLC4,674$387.7K0.03%
JB Capital LLC4,671$387.5K0.02%
Gsa Capital Partners LLP4,456$370.0K0.03%
Wellington Grp LLC4,189$347.5K0.12%
Hilton Head Capital Partners, LLC4,120$341.8K0.20%
BDFS Capital LLC4,061$340.3K0.17%
Pension & Wealth Management Advisors, Inc.4,050$335.9K0.10%
Strategic Financial Concepts, LLC4,000$331.8K0.30%
Capstone Investment Advisors, LLC3,901$323.6K0.00%
WealthCare Asset Management, LLC3,027$309.6K0.29%
Dakota Wealth Management3,620$300.3K0.01%
Sivia Capital Partners, LLC3,451$286.3K0.06%
Ofi Invest Asset Management3,444$285.7K0.00%
Gaddis Premier Wealth Advisors LLC3,426$284.1K0.22%
Kovack Advisors, Inc.3,339$277.0K0.01%
Vise Technologies, Inc.3,270$271.2K0.01%
Fideuram - Intesa Sanpaolo Private Banking S.P.A.3,055$253.4K0.01%
Marex Group plc3,047$252.7K0.00%
Lecap Asset Management Ltd2,950$244.7K0.10%
StoneX Group Inc.2,901$241.7K0.01%
Diversified Enterprises, LLC2,747$227.9K0.01%
TCI Wealth Advisors, Inc.2,712$225.0K0.01%
Simplex Trading, LLC2,357$195.5K0.01%
SHP Wealth Management1,750$145.1K0.01%
SageView Advisory Group, LLC1,747$144.9K0.00%
Los Angeles Capital Management LLC1,348$136.6K0.00%
Wealth Enhancement Trust Services, Inc.1,292$107.2K0.01%
Basecamp Wealth Advisors LLC1,277$105.9K0.02%
Copeland Capital Management, LLC1,075$89.2K0.00%
Wellington-Altus USA Inc.1,041$86.4K0.06%
Elyxium Wealth, LLC1,004$83.3K0.02%
Eurizon SLJ Capital Ltd906$75.2K0.03%
Safe Harbor Fiduciary, LLC824$68.4K0.06%
NCP Inc.804$66.7K0.05%
Caldwell Trust Co725$60.1K0.01%
Entrust Financial LLC637$52.8K0.04%
Global Wealth Strategies & Associates600$49.8K0.01%
Kohmann Bosshard Financial Services, LLC545$45.2K0.00%
Strive Financial Group ,LLC526$43.6K0.02%
Franchise GP Ltd455$37.7K0.04%
Triumph Capital Management428$35.5K0.01%
DV Equities, LLC408$33.8K0.01%
Bayban400$33.2K0.03%
Signature Equity Partners, LLC359$29.8K0.02%
Garton & Associates Financial Advisors LLC305$25.3K0.01%
Reflection Asset Management284$23.6K0.02%
Vision Retirement, LLC251$20.8K0.01%
Godfrey Financial Associates, Inc.229$19.0K0.02%
Palladiem, LLC215$17.9K0.02%
Blueline Advisors LLC211$17.5K0.01%
Tucker Asset Management LLC180$14.9K0.00%
FSA Advisors, Inc.14,470$14.7K0.01%
Pinnacle Wealth Planning Services, Inc.170$14.1K0.00%

Sold out (107)

Institutions that held Iron Mountain Inc at the end of Q3 2025 and filed for Q4 2025 without it.

Showing the largest 100 of 107 by value.

Institutions that sold out of IRM in Q4 2025
InstitutionShares, Q3 2025Value, Q3 2025
Bamco Inc436,831$44.5M
Aew Capital Management L P315,257$32.1M
Gillson Capital LP286,900$29.2M
Capital Fund Management S.A.118,570$12.1M
Waterfront Capital Partners, LLC115,286$11.8M
Susquehanna Portfolio Strategies, LLC105,141$10.7M
Summit Partners Public Asset Management, LLC85,000$8.66M
Hudson Bay Capital Management LP80,657$8.22M
Qube Research & Technologies Ltd38,654$3.94M
Zacks Investment Management19,412$1.98M
ING Groep NV17,304$1.76M
Edgestream Partners, L.P.17,300$1.76M
ExodusPoint Capital Management, LP13,038$1.33M
Oak Thistle LLC11,980$1.22M
NewSquare Capital LLC11,823$1.21M
Catalytic Wealth RIA, LLC10,938$1.12M
Jain Global LLC9,190$936.8K
Perpetual Ltd9,130$930.7K
Jump Financial, LLC9,017$919.2K
Aspire Private Capital, LLC8,855$902.7K
Aigen Investment Management, LP7,760$791.1K
Two Sigma Securities, LLC7,256$739.7K
Susquehanna Fundamental Investments, LLC6,739$687.0K
Twin Tree Management, LP6,576$670.4K
Caption Management, LLC6,400$652.4K
Jackson Square Capital, LLC5,999$611.5K
Arete Wealth Advisors, LLC5,150$525.0K
NorthRock Partners, LLC4,774$486.7K
GM Advisory Group, Inc.4,685$477.6K
Pinnacle Associates Ltd4,219$430.1K
Kovitz Investment Group Partners, LLC4,177$425.8K
RMR Wealth Builders3,730$380.3K
Strategic Investment Advisors3,706$377.8K
CAPROCK Group, Inc.4,081$376.8K
Strategic Blueprint, LLC3,645$371.6K
Prosperity Consulting Group, LLC3,640$371.1K
Jacobi Capital Management LLC3,279$334.3K
Dynamic Advisor Solutions LLC3,101$316.1K
Boothbay Fund Management, LLC3,034$309.3K
Accuvest Global Advisors3,000$306.0K
SeaCrest Wealth Management, LLC2,900$305.6K
Flow Traders U.S. LLC2,931$299.0K
Freestone Grove Partners LP2,798$285.2K
Turtle Creek Wealth Advisors, LLC2,771$282.5K
Diversified Trust Co2,764$281.8K
Cardiff Park Advisors, LLC2,684$273.6K
Change Path, LLC2,655$270.7K
Camden Capital, LLC2,619$267.0K
LaSalle St. Investment Advisors, LLC2,516$256.0K
Farringdon Capital, Ltd.2,511$256.0K
Fiduciary Planning LLC2,382$242.9K
Fielder Capital Group LLC2,381$242.7K
Bedel Financial Consulting, Inc.2,364$241.0K
Schmidt P J Investment Management Inc2,360$240.6K
Waldron Private Wealth LLC2,338$240.2K
Wealth Alliance2,324$236.9K
Intrua Financial, LLC2,319$236.4K
HBK Sorce Advisory LLC2,233$236.1K
Walleye Trading LLC2,305$235.0K
Mayflower Financial Advisors, LLC2,287$233.1K
Fayez Sarofim & Co2,280$232.4K
Smith, Moore & Co.2,277$232.1K
Waterloo Capital, L.P.2,272$231.6K
Mystic Asset Management, Inc.2,239$228.2K
Community Bank & Trust, Waco, Texas2,200$224.0K
Avidian Wealth Solutions, LLC2,179$222.1K
Valeo Financial Advisors, LLC2,173$221.5K
Nations Financial Group Inc,2,161$220.4K
Saxony Capital Management, LLC2,151$219.3K
Brighton Jones LLC2,134$217.5K
Stiles Financial Services Inc2,127$216.9K
Warm Springs Advisors Inc.2,117$215.8K
Ignite Planners, LLC2,097$213.8K
Great Valley Advisor Group, Inc.2,090$213.2K
Cassaday & Co Wealth Management LLC2,065$210.5K
Texas Bank & Trust Co2,054$209.4K
Channel Wealth LLC2,022$206.1K
Affinity Investment Advisors, LLC2,013$205.2K
Mosaic Family Wealth Partners, LLC2,040$204.7K
Apriem Advisors2,007$204.6K
Catalyst Capital Advisors LLC1,303$132.8K
Evermay Wealth Management LLC1,141$116.3K
Evolution Wealth Management Inc.960$97.8K
Quarry LP852$86.9K
Wealthspire Advisors, LLC824$84.0K
Ci Investments Inc.808$82.0K
City Holding Co667$68.0K
JPL Wealth Management, LLC554$56.5K
Washington Trust Advisors, Inc.530$54.0K
GPS Wealth Strategies Group, LLC500$51.0K
Central Pacific Bank - Trust Division278$28.3K
Thompson Investment Management, Inc.264$26.9K
Groupe la Francaise277$23.7K
Rise Advisors, LLC200$20.4K
Meeder Asset Management Inc129$13.2K
Bokf, NA121$12.3K
Dogwood Wealth Management LLC72$7.39K
ZRC Wealth Management, LLC30$3.06K
Tobam31$3.00K
Trifecta Capital Advisors, LLC27$2.75K

Not filed for Q4 2025 yet (22)

Institutions that held Iron Mountain Inc at the end of Q3 2025 and haven't filed a 13F for Q4 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding IRM in Q3 2025 that haven't filed for Q4 2025
InstitutionShares, Q3 2025Value, Q3 2025
CIBC Bancorp USA Inc.118,362$12.1M
AXA Investment Managers S.A.113,347$11.6M
Sonora Investment Management Group, LLC87,250$8.89M
Pinebridge Investments, L.P.72,235$7.36M
American Assets Capital Advisers, LLC24,433$2.49M
Creekmur Asset Management LLC15,097$1.54M
Wetherby Asset Management Inc10,565$1.08M
Glenmede Investment Management, LP10,216$1.04M
Shell Asset Management Co8,544$871.0K
Wolverine Trading, LLC5,919$594.0K
EWG Elevate Inc.5,722$583.3K
Point72 Asia (Singapore) Pte. Ltd.4,916$501.1K
Point72 (DIFC) Ltd4,238$432.0K
Lokken Investment Group LLC3,479$354.6K
RW Investment Management LLC2,000$203.9K
Optimum Investment Advisors750$76.5K
Promus Capital, LLC572$58.3K
Franchise Capital Ltd455$46.4K
AllSquare Wealth Management LLC395$40.3K
Hemington Wealth Management163$16.0K
Pineridge Advisors LLC22$2.24K
Guerra Advisors Inc5$510