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IRM

Iron Mountain Inc
$117.16 -4.74 (-3.89%) At close · Jul 2
Market Cap
$34.86B
Shares
297,524,681

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

The Jun 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out.
Holders: 1,088
Total Value: $23,633,781,430
Total Shares: 231,367,227
Showing 1–100 of 1,111 holdings by value · page 1 of 12

Institutional Ownership Trend

26 quarters

Superinvestors Holding IRM

All superinvestors →
George Soros $31,663,400 Joel Greenblatt $4,058,226 Ray Dalio $479,445

Holder Concentration

Across 1,089 13F filers
Top Holder
14.3%
Jun 2023 → Mar 2026 · range 14.3% – 20.3%
of institutional value
Top 5
40.6%
Jun 2023 → Mar 2026 · range 40.6% – 49.2%
of institutional value
Top 10
51.6%
Jun 2023 → Mar 2026 · range 51.6% – 58.9%
of institutional value
HHI
442
Jun 2023 → Mar 2026 · range 442 – 685
Broadly held
Showing 100 of 1,111
All Common Calls Puts
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Holder Value (USD) % of 13F Shares Open
Mega BlackRock, Inc. $3,372,801,088 14.27% 33,021,354
Mega VANGUARD CAPITAL MANAGEMENT LLC $1,916,032,922 8.11% 18,758,889
Mega STATE STREET CORP $1,792,723,794 7.59% 17,551,633
Large COHEN & STEERS, INC. $1,651,536,489 6.99% 16,169,341
Mega GEODE CAPITAL MANAGEMENT, LLC $866,773,010 3.67% 8,486,127
Mega FMR LLC $764,456,409 3.23% 7,484,398
Mega MORGAN STANLEY $475,180,501 2.01% 4,652,247
Mega PRINCIPAL FINANCIAL GROUP INC $466,380,737 1.97% 4,566,093
Mega DIMENSIONAL FUND ADVISORS LP $464,970,489 1.97% 4,552,286
Mega NORTHERN TRUST CORP Bank $423,930,637 1.79% 4,150,486
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $409,888,534 1.73% 4,013,007
Mega Invesco Ltd. $400,544,148 1.69% 3,921,521
Mega Legal & General Group Plc $320,216,457 1.35% 3,135,074
Large Daiwa Securities Group Inc. Broker-Dealer $317,393,921 1.34% 3,107,440
Mega DEUTSCHE BANK AG\ Bank $315,825,453 1.34% 3,092,084
Large PRUDENTIAL FINANCIAL INC $246,776,673 1.04% 2,416,063
Mid CENTERSQUARE INVESTMENT MANAGEMENT LLC $235,947,995 1.00% 2,310,045
Mega GOLDMAN SACHS GROUP INC $226,410,876 0.96% 2,216,672
Mega JPMORGAN CHASE & CO $216,879,779 0.92% 2,123,358
Large Vontobel Holding Ltd. $216,217,814 0.91% 2,116,877
Mega Nuveen, LLC $211,267,192 0.89% 2,068,408
Mega Capital World Investors $190,712,641 0.81% 1,867,169
Mega AMERIPRISE FINANCIAL INC $189,061,852 0.80% 1,851,007
Mega AQR CAPITAL MANAGEMENT LLC $188,557,891 0.80% 1,846,073
Large Select Equity Group, L.P. $181,758,130 0.77% 1,779,500
Mega VANGUARD FIDUCIARY TRUST CO Bank $168,825,980 0.71% 1,652,888
Mega Bank of New York Mellon Corp Bank $165,960,742 0.70% 1,624,836
Mid DUFF & PHELPS INVESTMENT MANAGEMENT CO $160,904,920 0.68% 1,575,337
Large Russell Investments Group, Ltd. $148,625,234 0.63% 1,455,113
Mid Contour Asset Management LLC $147,574,220 0.62% 1,444,823
Mega ROYAL BANK OF CANADA Bank $144,090,938 0.61% 1,410,720
Mega BANK OF AMERICA CORP /DE/ Bank $142,932,160 0.60% 1,399,375
Mid PGGM Investments $139,931,595 0.59% 1,369,998
Mega HSBC HOLDINGS PLC $130,009,406 0.55% 1,272,855
Mid CBRE INVESTMENT MANAGEMENT LISTED REAL ASSETS LLC $126,440,638 0.53% 1,237,915
Large DekaBank Deutsche Girozentrale Bank $114,652,150 0.49% 1,122,500
Mega Amundi $111,493,366 0.47% 1,091,574
Large SEI INVESTMENTS CO $99,565,254 0.42% 974,792
Mega Sumitomo Mitsui Trust Group, Inc. $95,370,365 0.40% 933,722
Mega Mitsubishi UFJ Asset Management Co., Ltd. $92,780,401 0.39% 908,365
Mega Swiss National Bank Bank $88,602,466 0.37% 867,461
Large Pictet Asset Management Holding SA $88,324,237 0.37% 864,737
Large CIBC Bancorp USA Inc. Bank $84,652,916 0.36% 828,793
Mega AMERICAN CENTURY COMPANIES INC $83,324,994 0.35% 815,792
Mega UBS Group AG $81,858,058 0.35% 801,430
Mega JANE STREET GROUP, LLC $72,258,023 0.31% 707,441
Large APG Asset Management US Inc. $71,897,571 0.30% 703,912
Mega BARCLAYS PLC $68,818,969 0.29% 673,771
Mega WELLS FARGO & COMPANY/MN $67,254,489 0.28% 658,454
Mid Welch & Forbes LLC $66,602,225 0.28% 652,068
Mega Vanguard Global Advisers, LLC $66,163,738 0.28% 647,775
Mega LPL Financial LLC $63,453,249 0.27% 621,238
Large Epoch Investment Partners, Inc. $62,970,636 0.27% 616,513
Mega PRICE T ROWE ASSOCIATES INC /MD/ $61,445,482 0.26% 601,581
Large Universal- Beteiligungs- und Servicegesellschaft mbH $60,314,078 0.26% 590,504
Large ADAGE CAPITAL PARTNERS GP, L.L.C. $60,267,911 0.26% 590,052
Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. $59,944,024 0.25% 586,881
Mega RHUMBLINE ADVISERS $59,092,382 0.25% 578,543
Mega ALLIANCEBERNSTEIN L.P. $57,735,145 0.24% 565,255
Large NOMURA ASSET MANAGEMENT CO LTD $57,539,853 0.24% 563,343
Large WORLDQUANT MILLENNIUM ADVISORS LLC $55,977,724 0.24% 548,049
Large Asset Management One Co., Ltd. $55,918,994 0.24% 547,474
Large BAMCO INC /NY/ $53,651,077 0.23% 525,270
Mega BNP PARIBAS ARBITRAGE, SA $51,939,313 0.22% 508,511
Mega VANGUARD ASSET MANAGEMENT, Ltd $51,580,189 0.22% 504,995
Mid DigitalBridge Group, Inc. $51,480,703 0.22% 504,021
Mega California Public Employees Retirement System Pension $51,321,264 0.22% 502,460
Mid Border to Coast Pensions Partnership Ltd Pension $48,005,800 0.20% 470,000
Large Clark Capital Management Group, Inc. $47,838,801 0.20% 468,365
Mega National Pension Service Pension $43,858,098 0.19% 429,392
Large PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO Pension $43,278,147 0.18% 423,714
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $43,192,043 0.18% 422,871
Mega BANK OF MONTREAL /CAN/ Bank $41,470,164 0.18% 406,013
Large TEACHER RETIREMENT SYSTEM OF TEXAS Pension $40,314,760 0.17% 394,701
Large Rockefeller Capital Management L.P. $39,746,757 0.17% 389,140
Large Point72 Asset Management, L.P. $38,569,902 0.16% 377,618
Mega CITADEL ADVISORS LLC $38,297,800 0.16% 374,954
Mega MILLENNIUM MANAGEMENT LLC $38,247,650 0.16% 374,463
Large Aberdeen Group plc $37,915,183 0.16% 371,208
Mega NEUBERGER BERMAN GROUP LLC $36,847,106 0.16% 360,751
Mid Adelante Capital Management LLC $36,457,238 0.15% 356,934
Mega WELLINGTON MANAGEMENT GROUP LLP $35,536,037 0.15% 347,915
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $35,146,374 0.15% 344,100
Large Vanguard Investments Australia, Ltd. $35,068,134 0.15% 343,334
Large CANADA LIFE ASSURANCE Co Insurance $34,304,740 0.15% 335,860
Large Quantinno Capital Management LP $32,890,816 0.14% 322,017
Mid ADELL HARRIMAN & CARPENTER INC $32,257,548 0.14% 315,817
Mega CITIGROUP INC $32,238,855 0.14% 315,634
Mid SOROS FUND MANAGEMENT LLC $31,663,400 0.13% 310,000
Small Marble Harbor Investment Counsel, LLC $30,690,414 0.13% 300,474
Large Ensign Peak Advisors, Inc $30,369,286 0.13% 297,330
Mega RAYMOND JAMES FINANCIAL INC $30,144,883 0.13% 295,133
Large STRS OHIO $29,397,628 0.12% 287,817
Large MACQUARIE GROUP LTD $27,640,717 0.12% 270,616
Mid Apollo Management Holdings, L.P. $27,122,153 0.11% 265,539
Large AVIVA PLC $26,883,248 0.11% 263,200
Large STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM Pension $26,813,282 0.11% 262,515
Large Swedbank AB Bank $26,590,106 0.11% 260,330
Large Cetera Investment Advisers $26,560,383 0.11% 260,039
Mid Heitman Real Estate Securities LLC Broker-Dealer $26,514,931 0.11% 259,594
Key facts CIK 1020569 CUSIP 46284V101 13F (30d) 50 filings 11 filers Visit website Investor relations

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