Iron Mountain Incorporated (Del

Historical 13F Holders

Symbol
IRM
CUSIP
46284V101
All holders as of
Q2 2026
Type
Equity
Class
COM
Reported Value, Excluding Options
Total Filings

13D/G Filers

Investors who own more than 5% of a class must file a Schedule 13D or 13G. Each filer's latest filing for 46284V101 since 12/18/2024, largest first.

Filer % of Class Filed
Vanguard Portfolio Management LLC 13G 8.4% 4/29/2026
Event 3/31/2026
Vanguard Capital Management LLC 13G 7.4% 4/30/2026
Event 3/31/2026
Under 5%, checked the "5 percent or less" box, or amended by a later filing (2)
Cohen & Steers, Inc. 13G/A
4.9% 5/7/2026
Event 4/30/2026
Vanguard Group Inc 13G/A 0% 3/27/2026
Event 3/13/2026

13F Holders by Quarter

Period Filings Shares, Excl. Options Value, Excl. Options
2026 Q3 44 519 k $50.3 M
2026 Q2 1,219 312 M $32.9 B
2026 Q1 1,130 253 M $25.8 B
2025 Q4 1,059 259 M $21.5 B
2025 Q3 1,069 253 M $25.8 B
2025 Q2 1,098 252 M $25.9 B
2025 Q1 1,044 246 M $21.1 B
2024 Q4 1,123 238 M $25.0 B
2024 Q3 1,114 246 M $29.1 B
2024 Q2 1,017 254 M $22.7 B
2024 Q1 992 247 M $19.8 B
2023 Q4 940 241 M $16.8 B
2023 Q3 874 230 M $13.6 B
2023 Q2 865 229 M $13.0 B
2023 Q1 831 228 M $12.1 B
2022 Q4 827 244 M $12.5 B
2022 Q3 792 228 M $10.0 B
2022 Q2 810 224 M $10.9 B
2022 Q1 823 226 M $12.5 B
2021 Q4 803 229 M $12.0 B
2021 Q3 756 229 M $9.94 B
2021 Q2 734 230 M $9.73 B
2021 Q1 673 228 M $8.44 B
2020 Q4 659 237 M $7.02 B
2020 Q3 637 243 M $6.53 B
2020 Q2 616 247 M $6.46 B
2020 Q1 590 249 M $5.90 B
2019 Q4 626 247 M $7.90 B
2019 Q3 575 245 M $7.95 B
2019 Q2 584 251 M $7.87 B
2019 Q1 574 256 M $9.07 B
2018 Q4 516 261 M $8.46 B
2018 Q3 548 259 M $8.94 B
2018 Q2 525 251 M $8.78 B
2018 Q1 509 253 M $8.37 B
2017 Q4 508 254 M $9.59 B
2017 Q3 437 238 M $9.24 B
2017 Q2 412 232 M $7.96 B
2017 Q1 401 231 M $8.24 B
2016 Q4 404 221 M $7.18 B
2016 Q3 408 216 M $8.13 B
2016 Q2 409 215 M $8.83 B
2016 Q1 367 205 M $6.93 B
2015 Q4 361 205 M $5.54 B
2015 Q3 339 206 M $6.38 B
2015 Q2 365 204 M $6.31 B
2015 Q1 353 196 M $7.16 B
2014 Q4 27 34.0 M $1.31 B
2014 Q3 1 3.20 M $105 M
2014 Q1 2 121 k $3.35 M