Iron Mountain Incorporated
MX ˙ BMV ˙ US46284V1017
SecurityMX:IRM1 / Iron Mountain Incorporated
InstitutionCIBC World Markets Inc.
Latest Disclosed Ownership168,419 shares
Latest Disclosed Value $ 17,202,317
CIBC World Markets Inc. reports 19.04% decrease in ownership of IRM1 / Iron Mountain Incorporated

On May 14, 2026 - CIBC World Markets Inc. filed a 13F-HR form disclosing ownership of 168,419 shares of Iron Mountain Incorporated (MX:IRM1) valued at $17,202,317 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 208,036 shares of Iron Mountain Incorporated. This represents a change in shares of -19.04% during the quarter.

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)
2026-05-14 2026-03-31 13F IRON MTN INC DEL COM 46284V101 168,419 -39,617 -19.04 17,202 -0.31 0.0281
2026-02-10 2025-12-31 13F IRON MTN INC DEL COM 46284V101 208,036 35,586 20.64 17,257 -1.84 0.0278
2025-11-06 2025-09-30 13F IRON MTN INC DEL COM 46284V101 172,450 36,859 27.18 17,580 26.40 0.0315
2025-08-14 2025-06-30 13F IRON MTN INC DEL COM 46284V101 135,591 2,480 1.86 13,908 21.44 0.0275
2025-05-14 2025-03-31 13F IRON MTN INC DEL COM 46284V101 133,111 -31,171 -18.97 11,453 67,264.71 0.0245
2025-01-23 2024-12-31 13F IRON MTN INC DEL COM 46284V101 164,282 -14,726 -8.23 17 -19.05 0.0362
2024-11-12 2024-09-30 13F IRON MTN INC DEL COM 46284V101 179,008 109,216 156.49 21 250.00 0.0443
2024-08-07 2024-06-30 13F IRON MTN INC DEL COM 46284V101 69,792 -75,085 -51.83 6 -45.45 0.0144
2024-05-13 2024-03-31 13F IRON MTN INC DEL COM 46284V101 144,877 98,394 211.68 12 266.67 0.0276
2024-02-13 2023-12-31 13F IRON MTN INC DEL COM 46284V101 46,483 -3,627 -7.24 3 50.00 0.0082
2023-11-13 2023-09-30 13F IRON MTN INC DEL COM 46284V101 50,110 -5,788 -10.35 3 -33.33 0.0098
2023-08-11 2023-06-30 13F IRON MTN INC DEL COM 46284V101 55,898 -4,320 -7.17 3 0.00 0.0101
2023-05-12 2023-03-31 13F IRON MTN INC DEL COM 46284V101 60,218 -1,545 -2.50 3 0.00 0.0107
2023-02-13 2022-12-31 13F IRON MTN INC DEL COM 46284V101 61,763 8,765 16.54 3 -99.87 0.0109
2022-11-10 2022-09-30 13F IRON MTN INC DEL COM 46284V101 52,998 3,300 6.64 2,330 -3.72 0.0090
2022-08-10 2022-06-30 13F IRON MTN INC COM 46284V101 49,698 26,483 114.08 2,420 88.18 0.0085
2022-05-12 2022-03-31 13F IRON MTN INC COM 46284V101 23,215 -19,351 -45.46 1,286 -42.25 0.0041
2022-02-14 2021-12-31 13F IRON MTN INC COM 46284V101 42,566 -200 -0.47 2,227 19.86 0.0064
2021-11-12 2021-09-30 13F IRON MTN INC COM 46284V101 42,766 1,943 4.76 1,858 7.52 0.0061
2021-08-12 2021-06-30 13F IRON MTN INC COM 46284V101 40,823 13,425 49.00 1,728 70.41 0.0048
2021-05-11 2021-03-31 13F IRON MTN INC COM 46284V101 27,398 -3,912 -12.49 1,014 9.86 0.0030
2021-02-08 2020-12-31 13F IRON MTN INC COM 46284V101 31,310 -10,229 -24.63 923 -17.07 0.0029
2020-11-12 2020-09-30 13F IRON MTN INC COM 46284V101 41,539 7,625 22.48 1,113 25.76 0.0048
2020-08-13 2020-06-30 13F IRON MTN INC COM 46284V101 33,914 -1,063 -3.04 885 6.37 0.0040
2020-05-15 2020-03-31 13F IRON MTN INC COM 46284V101 34,977 -24,114 -40.81 832 -55.82 0.0043
2020-02-13 2019-12-31 13F IRON MTN INC COM 46284V101 59,091 20,673 53.81 1,883 51.37 0.0077
2019-11-13 2019-09-30 13F IRON MTN INC COM 46284V101 38,418 -6,084 -13.67 1,244 -10.70 0.0056
2019-08-08 2019-06-30 13F IRON MTN INC COM 46284V101 44,502 5,530 14.19 1,393 0.80 0.0062
2019-05-09 2019-03-31 13F IRON MTN INC COM 46284V101 38,972 -24,412 -38.51 1,382 -32.72 0.0064
2019-02-13 2018-12-31 13F IRON MTN INC COM 46284V101 63,384 -467 -0.73 2,054 -6.81 0.0105
2018-11-09 2018-09-30 13F IRON MTN INC COM 46284V101 63,851 5,454 9.34 2,204 7.83 0.0094
2018-08-08 2018-06-30 13F IRON MTN INC COM 46284V101 58,397 24,214 70.84 2,044 82.01 0.0089
2018-05-18 2018-03-31 13F IRON MTN INC COM 46284V101 34,183 21,622 172.14 1,123 136.92 0.0046
2018-02-01 2017-12-31 13F IRON MTN INC COM 46284V101 12,561 1,266 11.21 474 7.97 0.0021
2017-11-13 2017-09-30 13F IRON MTN INC COM 46284V101 11,295 5,380 90.96 439 116.26 0.0021
2017-08-10 2017-06-30 13F IRON MTN INC COM 46284V101 5,915 5,915 203 0.0009
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.