Iron Mountain Incorporated
US ˙ NYSE ˙ US46284V1017

SecurityIRM / Iron Mountain Incorporated
InstitutionTd Asset Management Inc
Latest Disclosed Ownership181,283 shares
Latest Disclosed Value $ 18,516,245
Td Asset Management Inc reports 0.48% increase in ownership of IRM / Iron Mountain Incorporated

On May 11, 2026 - Td Asset Management Inc filed a 13F-HR form disclosing ownership of 181,283 shares of Iron Mountain Incorporated (US:IRM) valued at $18,516,246 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 180,420 shares of Iron Mountain Incorporated. This represents a change in shares of 0.48% during the quarter. The current value of the position is $22,598,739 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-11 2026-03-31 13F IRON MTN INC DEL COM 46284V101 181,283 863 0.48 18,516 23.73 0.0150
2026-02-10 2025-12-31 13F IRON MTN INC DEL COM 46284V101 180,420 4,090 2.32 14,966 -16.75 0.0120
2025-11-10 2025-09-30 13F IRON MTN INC DEL COM 46284V101 176,330 -3,658 -2.03 17,975 -2.63 0.0146
2025-07-28 2025-06-30 13F IRON MTN INC DEL COM 46284V101 179,988 -14,036 -7.23 18,461 10.59 0.0158
2025-05-07 2025-03-31 13F IRON MTN INC DEL COM 46284V101 194,024 -1,758,408 -90.06 16,694 -91.87 0.0154
2025-02-11 2024-12-31 13F IRON MTN INC DEL COM 46284V101 1,952,432 1,086,308 125.42 205,220 102.98 0.1816
2024-11-01 2024-09-30 13F IRON MTN INC DEL COM 46284V101 866,124 594,759 219.17 101,103 315.73 0.0892
2024-08-02 2024-06-30 13F IRON MTN INC DEL COM 46284V101 271,365 -8,510 -3.04 24,320 8.33 0.0227
2024-05-08 2024-03-31 13F IRON MTN INC DEL COM 46284V101 279,875 -12,396 -4.24 22,449 9.75 0.0209
2024-02-12 2023-12-31 13F IRON MTN INC DEL COM 46284V101 292,271 4,361 1.51 20,453 19.50 0.0201
2023-10-27 2023-09-30 13F IRON MTN INC DEL COM 46284V101 287,910 -35,553 -10.99 17,116 -6.87 0.0207
2023-08-09 2023-06-30 13F IRON MTN INC DEL COM 46284V101 323,463 -36,185 -10.06 18,379 -3.41 0.0209
2023-05-10 2023-03-31 13F IRON MTN INC DEL COM 46284V101 359,648 15,931 4.63 19,029 11.05 0.0230
2023-02-07 2022-12-31 13F IRON MTN INC DEL COM 46284V101 343,717 24,770 7.77 17,134 22.62 0.0211
2022-11-07 2022-09-30 13F IRON MTN INC COM 46284V101 318,947 6,092 1.95 13,973 -8.27 0.0175
2022-08-04 2022-06-30 13F IRON MTN INC COM 46284V101 312,855 277,075 774.39 15,233 668.57 0.0176
2022-05-10 2022-03-31 13F IRON MTN INC COM 46284V101 35,780 -270,433 -88.32 1,982 -87.63 0.0012
2022-05-10 2022-03-31 13F IRON MTN INC COM 46284V101 303,152 16,797
2022-02-10 2021-12-31 13F IRON MTN INC COM 46284V101 306,213 -44,303 -12.64 16,024 5.21 0.0134
2021-11-09 2021-09-30 13F IRON MTN INC COM 46284V101 350,516 -6,032 -1.69 15,230 -2.39 0.0158
2021-08-11 2021-06-30 13F IRON MTN INC COM 46284V101 356,548 -76,142 -17.60 15,603 -2.57 0.0158
2021-05-14 2021-03-31 13F IRON MTN INC COM 46284V101 432,690 -151,311 -25.91 16,014 -6.98 0.0179
2021-02-16 2020-12-31 13F IRON MTN INC COM 46284V101 584,001 8,778 1.53 17,216 11.72 0.0209
2020-11-10 2020-09-30 13F IRON MTN INC COM 46284V101 575,223 9,641 1.70 15,410 4.39 0.0214
2020-08-13 2020-06-30 13F IRON MTN INC COM 46284V101 565,582 74,279 15.12 14,762 26.25 0.0210
2020-05-15 2020-03-31 13F IRON MTN INC COM 46284V101 491,303 42,036 9.36 11,693 -18.33 0.0198
2020-02-11 2019-12-31 13F IRON MTN INC COM 46284V101 449,267 -25,034 -5.28 14,318 -6.80 0.0208
2019-11-07 2019-09-30 13F IRON MTN INC COM 46284V101 474,301 -34,107 -6.71 15,363 -3.46 0.0235
2019-08-01 2019-06-30 13F IRON MTN INC COM 46284V101 508,408 -35,525 -6.53 15,913 -17.50 0.0238
2019-05-08 2019-03-31 13F IRON MTN INC COM 46284V101 543,933 -16,552 -2.95 19,288 6.18 0.0294
2019-02-01 2018-12-31 13F IRON MTN INC COM 46284V101 560,485 38,003 7.27 18,165 0.72 0.0316
2018-11-01 2018-09-30 13F IRON MTN INC COM 46284V101 522,482 -48,029 -8.42 18,036 -9.70 0.0267
2018-07-31 2018-06-30 13F IRON MTN INC COM 46284V101 570,511 -9,589 -1.65 19,974 4.78 0.0304
2018-05-11 2018-03-31 13F IRON MTN INC COM 46284V101 580,100 -6,823 -1.16 19,062 -13.92 0.0292
2018-02-02 2017-12-31 13F IRON MTN INC COM 46284V101 586,923 3,168 0.54 22,145 -2.48 0.0323
2017-11-09 2017-09-30 13F IRON MTN INC COM 46284V101 583,755 4,275 0.74 22,708 14.05 0.0340
2017-08-01 2017-06-30 13F IRON MTN INC COM 46284V101 579,480 -10,225 -1.73 19,911 -5.34 0.0314
2017-05-05 2017-03-31 13F IRON MTN INC COM 46284V101 589,705 -3,231 -0.54 21,035 9.22 0.0335
2017-02-08 2016-12-31 13F IRON MTN INC COM 46284V101 592,936 -12,451 -2.06 19,259 -15.23 0.0325
2016-11-02 2016-09-30 13F IRON MTN INC COM 46284V101 605,387 -96,516 -13.75 22,720 -18.73 0.0393
2016-08-04 2016-06-30 13F IRON MTN INC COM 46284V101 701,903 37,454 5.64 27,956 24.08 0.0507
2016-05-05 2016-03-31 13F IRON MTN INC COM 46284V101 664,449 45,866 7.41 22,531 34.85 0.0421
2016-02-04 2015-12-31 13F IRON MTN INC COM 46284V101 618,583 36,016 6.18 16,708 -7.55 0.0331
2015-11-12 2015-09-30 13F IRON MTN INC COM 46284V101 582,567 212,667 57.49 18,072 57.60 0.0356
2015-08-11 2015-06-30 13F IRON MTN INC COM 46284V101 369,900 64,029 20.93 11,467 2.77 0.0205
2015-04-28 2015-03-31 13F IRON MTN INC COM 46284V101 305,871 305,871 11,158 0.0201
2015-01-30 2014-12-31 13F IRON MTN COM 462846106 0 -68,972 -100.00 0 -100.00
2014-11-06 2014-09-30 13F IRON MTN COM 462846106 68,972 -3,424 -4.73 2,252 -12.24 0.0039
2014-08-12 2014-06-30 13F IRON MTN COM 462846106 72,396 -500 -0.69 2,566 27.66 0.0044
2014-05-09 2014-03-31 13F IRON MTN COM 462846106 72,896 -5,000 -6.42 2,010 -14.97 0.0037
2014-02-07 2013-12-31 13F IRON MTN COM 462846106 77,896 -2,300 -2.87 2,364 9.09 0.0044
2013-11-08 2013-09-30 13F IRON MTN COM 462846106 80,196 -3,700 -4.41 2,167 -2.91 0.0043
2013-07-24 2013-06-30 13F IRON MTN COM 462846106 83,896 83,896 2,232 0.0048
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.