IRON MOUNTAIN INC - Common Stock (IRM)

Historical Holders from Q1 2014 to Q3 2025

Symbol
IRM on NYSE
Type / Class
Equity / Common Stock
Shares outstanding
295M
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares, excl. options
250M
Holdings value
$25.5B
% of all portfolios
0.018%
Grand Portfolio weight change
+0%
Number of holders
996
Number of buys
426
Number of sells
-478
Average Value change %
0%
Average buys %
+0.002%
Average sells %
-0.003%
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of IRON MOUNTAIN INC - Common Stock (IRM)

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
COHEN & STEERS, INC. 5.43% +27% $1.63B $330M 16M +25.3% Cohen & Steers, Inc. 30 Sep 2025

Institutional Holders of IRON MOUNTAIN INC - Common Stock (IRM)

Period Reported Shares, Excl. Options Value, Excl. Options Change Price Investors
2025 Q3 250M $25.5B +$93.7M $101.94 996
2025 Q2 249M $25.5B +$803M $102.57 1,032
2025 Q1 241M $20.7B +$264M $86.04 981
2024 Q4 237M $24.9B -$607M $105.11 1,052
2024 Q3 242M $28.7B -$1.11B $118.83 1,044
2024 Q2 247M $22.2B +$1.04B $89.62 958
2024 Q1 236M $18.9B +$214M $80.21 929
2023 Q4 233M $16.3B +$272M $69.98 884
2023 Q3 230M $13.7B +$172M $59.45 826
2023 Q2 227M $12.9B +$83.7M $56.82 805
2023 Q1 225M $11.9B -$142M $52.91 778
2022 Q4 228M $11.4B +$44.6M $49.85 773
2022 Q3 227M $9.99B +$96.6M $43.97 731
2022 Q2 224M $10.9B -$16.3M $48.69 755
2022 Q1 224M $12.4B -$172M $55.41 765
2021 Q4 228M $11.9B -$32.9M $52.33 735
2021 Q3 228M $9.92B -$6.52M $43.45 693
2021 Q2 229M $9.68B +$47M $42.32 674
2021 Q1 227M $8.41B -$146M $37.01 611
2020 Q4 232M $6.84B -$284M $29.48 591
2020 Q3 242M $6.5B -$98.5M $26.79 576
2020 Q2 246M $6.43B +$15.1M $26.10 547
2020 Q1 246M $5.86B +$68.1M $23.80 512
2019 Q4 242M $7.71B -$27.1M $31.87 559
2019 Q3 242M $7.84B -$246M $32.39 497
2019 Q2 250M $7.82B -$131M $31.30 504
2019 Q1 255M $9.05B -$60.2M $35.46 521
2018 Q4 257M $8.33B +$109M $32.41 471
2018 Q3 255M $8.79B +$165M $34.52 490
2018 Q2 250M $8.75B -$52.2M $35.01 473
2018 Q1 251M $8.26B -$241M $32.86 461
2017 Q4 254M $9.57B +$597M $37.73 466
2017 Q3 238M $9.24B +$223M $38.90 402
2017 Q2 232M $7.96B +$112M $34.36 374
2017 Q1 228M $8.13B +$978M $35.67 363
2016 Q4 218M $7.08B +$22.2M $32.48 363
2016 Q3 216M $8.11B +$99.3M $37.53 366
2016 Q2 214M $8.53B +$470M $39.83 376
2016 Q1 203M $6.87B +$16.4M $33.91 336
2015 Q4 204M $5.5B -$53.7M $27.01 328
2015 Q3 205M $6.35B +$99.9M $31.02 310
2015 Q2 202M $6.27B +$140M $31.00 336
2015 Q1 196M $7.15B +$5.9B $36.48 327
2014 Q4 34M $1.31B +$1.19B $38.66 25
2014 Q3 3.2M $105M $32.65 1
2014 Q2 0 $0 -$3.34M 0
2014 Q1 121K $3.35M +$562K $32.03 2