Iron Mountain Incorporated
MX ˙ BMV ˙ US46284V1017
SecurityMX:IRM1 / Iron Mountain Incorporated
InstitutionDnB Asset Management AS
Latest Disclosed Ownership91,233 shares
Latest Disclosed Value $ 9,318,539
DnB Asset Management AS reports 35.45% decrease in ownership of IRM1 / Iron Mountain Incorporated

On May 14, 2026 - DnB Asset Management AS filed a 13F-HR form disclosing ownership of 91,233 shares of Iron Mountain Incorporated (MX:IRM1) valued at $9,318,539 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 141,339 shares of Iron Mountain Incorporated. This represents a change in shares of -35.45% 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 Mountain COM 46284V101 91,233 -50,106 -35.45 9,319 -20.52 0.0332
2026-02-05 2025-12-31 13F Iron Mountain COM 46284V101 141,339 84,356 148.04 11,724 101.86 0.0409
2025-11-12 2025-09-30 13F Iron Mountain COM 46284V101 56,983 2,951 5.46 5,809 4.80 0.0217
2025-08-12 2025-06-30 13F Iron Mountain COM 46284V101 54,032 2,300 4.45 5,542 24.51 0.0230
2025-05-15 2025-03-31 13F Iron Mountain common 46284V101 51,732 -853 -1.62 4,451 -19.47 0.0205
2025-02-12 2024-12-31 13F Iron Mountain COM 46284V101 52,585 2,919 5.88 5,527 -6.34 0.0239
2024-11-12 2024-09-30 13F Iron Mountain COM 46284V101 49,666 743 1.52 5,902 34.60 0.0266
2024-07-05 2024-06-30 13F Iron Mountain common 46284V101 48,923 3,822 8.47 4,384 21.21 0.0209
2024-04-12 2024-03-31 13F Iron Mountain common 46284V101 45,101 -1,841 -3.92 3,618 10.11 0.0189
2024-01-04 2023-12-31 13F Iron Mountain common 46284V101 46,942 -310 -0.66 3,285 16.95 0.0171
2023-10-13 2023-09-30 13F Iron Mountain common 46284V101 47,252 -6,731 -12.47 2,809 -8.41 0.0168
2023-07-10 2023-06-30 13F/A-1 Iron Mountain common 46284V101 53,983 -740 -1.35 3,067 5.94 0.0176
2023-07-06 2023-06-30 13F Iron Mountain common 46284V101 53,983 -740 3,067 0.0180
2023-04-20 2023-03-31 13F Iron Mountain common 46284V101 54,723 9,634 21.37 2,895 28.84 0.0184
2023-01-12 2022-12-31 13F Iron Mountain common 46284V101 45,089 -2,043 -4.33 2,248 8.45 0.0158
2022-10-11 2022-09-30 13F Iron Mountain common 46284V101 47,132 -1,300 -2.68 2,072 -12.13 0.0160
2022-07-08 2022-06-30 13F Iron Mountain common 46284V101 48,432 939 1.98 2,358 -10.38 0.0166
2022-04-08 2022-03-31 13F Iron Mountain common 46284V101 47,493 3,225 7.29 2,632 13.60 0.0156
2022-01-12 2021-12-31 13F Iron Mountain common 46284V101 44,268 4,352 10.90 2,317 33.56 0.0136
2021-10-15 2021-09-30 13F Iron Mountain common 46284V101 39,916 1,657 4.33 1,734 7.10 0.0113
2021-07-06 2021-06-30 13F Iron Mountain common 46284V101 38,259 1,842 5.06 1,619 20.19 0.0107
2021-04-15 2021-03-31 13F Iron Mountain common 46284V101 36,417 2,141 6.25 1,348 33.37 0.0098
2021-01-19 2020-12-31 13F Iron Mountain common 46284V101 34,276 2,866 9.12 1,010 20.10 0.0089
2020-10-14 2020-09-30 13F Iron Mountain common 46284V101 31,410 3,438 12.29 841 15.21 0.0089
2020-07-08 2020-06-30 13F Iron Mountain common 46284V101 27,972 0 0.00 730 9.77 0.0086
2020-04-17 2020-03-31 13F Iron Mountain common 46284V101 27,972 -5,300 -15.93 666 -37.26 0.0098
2020-01-13 2019-12-31 13F Iron Mountain common 46284V101 33,272 2,800 9.19 1,060 7.51 0.0104
2019-10-16 2019-09-30 13F Iron Mountain common 46284V101 30,472 2,924 10.61 987 14.39 0.0111
2019-07-08 2019-06-30 13F Iron Mountain common 46284V101 27,548 -620 -2.20 862 -13.63 0.0099
2019-04-11 2019-03-31 13F Iron Mountain common 46284V101 28,168 -19,974 -41.49 999 -36.03 0.0114
2019-01-15 2018-12-31 13F Iron Mountain common 46284V101 48,142 19,500 68.08 1,560 57.89 0.0202
2018-10-10 2018-09-30 13F Iron Mountain common 46284V101 28,642 400 1.42 989 0.00 0.0111
2018-07-06 2018-06-30 13F Iron Mountain common 46284V101 28,242 2,100 8.03 989 15.02 0.0117
2018-04-11 2018-03-31 13F Iron Mountain common 46284V101 26,142 1,800 7.39 859 -6.43 0.0103
2018-01-10 2017-12-31 13F Iron Mountain common 46284V101 24,342 3,100 14.59 918 11.14 0.0111
2017-10-11 2017-09-30 13F Iron Mountain common 46284V101 21,242 0 0.00 826 13.31 0.0110
2017-07-06 2017-06-30 13F Iron Mountain common 46284V101 21,242 1,200 5.99 730 2.10 0.0106
2017-04-19 2017-03-31 13F Iron Mountain common 46284V101 20,042 4,300 27.32 715 39.73 0.0112
2017-01-17 2016-12-31 13F Iron Mountain common 46284V101 15,742 1,300 9.00 511 -5.72 0.0094
2016-10-28 2016-09-30 13F Iron Mountain common 46284V101 14,442 0 0.00 542 -5.74 0.0107
2016-07-08 2016-06-30 13F Iron Mountain common 46284V101 14,442 2,700 22.99 575 44.47 0.0122
2016-04-11 2016-03-31 13F Iron Mountain common 46284V101 11,742 11,742 398 0.0083
2015-10-21 2015-09-30 13F Iron Mountain common 46284V101 0 -12,642 -100.00 0 -100.00
2015-07-07 2015-06-30 13F Iron Mountain common 46284V101 12,642 -2,300 -15.39 392 -28.26 0.0086
2015-05-18 2015-03-31 13F Iron Mountain common 46284V101 14,942 1,700 12.84 545 6.65 0.0121
2015-05-19 2014-12-31 13F Iron Mountain common 462846106 13,242 13,242 512 0.0116
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.