Iron Mountain Incorporated
DE ˙ DB ˙ US46284V1017
111,85 € ↑2,30 (2,10%)
2026-06-05
DEL PRIS
SecurityDE:I5M / Iron Mountain Incorporated
InstitutionMonument Capital Management
Latest Disclosed Ownership3,549 shares
Latest Disclosed Value $ 362,503
Monument Capital Management reports 0.11% increase in ownership of I5M / Iron Mountain Incorporated

On April 15, 2026 - Monument Capital Management filed a 13F-HR form disclosing ownership of 3,549 shares of Iron Mountain Incorporated (DE:I5M) valued at $315,080 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 3,545 shares of Iron Mountain Incorporated. This represents a change in shares of 0.11% during the quarter. The current value of the position is $396,956 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)
2026-04-15 2026-03-31 13F IRON MTN INC DEL COM 46284V101 3,549 4 0.11 363 23.13 0.0908
2026-01-26 2025-12-31 13F IRON MTN INC DEL COM 46284V101 3,545 -2,694 -43.18 294 -53.77 0.0732
2025-10-14 2025-09-30 13F IRON MTN INC DEL COM 46284V101 6,239 -315 -4.81 636 -5.36 0.1590
2025-07-24 2025-06-30 13F IRON MTN INC DEL COM 46284V101 6,554 3,001 84.46 672 120.33 0.1751
2025-04-25 2025-03-31 13F IRON MTN INC DEL COM 46284V101 3,553 -5,336 -60.03 306 -67.34 0.0940
2025-01-31 2024-12-31 13F IRON MTN INC DEL COM 46284V101 8,889 -218 -2.39 934 -13.68 0.2576
2024-10-15 2024-09-30 13F IRON MTN INC DEL COM 46284V101 9,107 -587 -6.06 1,082 24.65 0.2993
2024-07-22 2024-06-30 13F IRON MTN INC DEL COM 46284V101 9,694 -119 -1.21 869 10.29 0.2556
2024-04-19 2024-03-31 13F IRON MTN INC DEL COM 46284V101 9,813 -306 -3.02 787 11.16 0.2268
2024-02-01 2023-12-31 13F IRON MTN INC DEL COM 46284V101 10,119 -440 -4.17 708 12.92 0.2279
2023-10-25 2023-09-30 13F IRON MTN INC DEL COM 46284V101 10,559 -1,250 -10.59 628 -6.42 0.2107
2023-07-18 2023-06-30 13F IRON MTN INC DEL COM 46284V101 11,809 -353 -2.90 671 4.20 0.2139
2023-04-21 2023-03-31 13F IRON MTN INC DEL COM 46284V101 12,162 -12,352 -50.39 643 -47.38 0.2154
2023-01-27 2022-12-31 13F IRON MTN INC DEL COM 46284V101 24,514 -274 -1.11 1,222 12.11 0.4178
2022-11-07 2022-09-30 13F IRON MTN INC DEL COM 46284V101 24,788 -3,517 -12.43 1,090 -20.90 0.4088
2022-07-20 2022-06-30 13F IRON MTN INC COM 46284V101 28,305 -775 -2.67 1,378 -14.46 0.5198
2022-04-14 2022-03-31 13F IRON MTN INC COM 46284V101 29,080 -16 -0.05 1,611 5.78 0.5224
2022-01-18 2021-12-31 13F IRON MTN INC COM 46284V101 29,096 -947 -3.15 1,523 16.70 0.4726
2021-10-22 2021-09-30 13F IRON MTN INC COM 46284V101 30,043 388 1.31 1,305 3.98 0.4437
2021-07-27 2021-06-30 13F IRON MTN INC COM 46284V101 29,655 4,760 19.12 1,255 36.26 0.4345
2021-04-12 2021-03-31 13F IRON MTN INC COM 46284V101 24,895 2,060 9.02 921 36.85 0.3693
2021-01-15 2020-12-31 13F IRON MTN INC COM 46284V101 22,835 -4,366 -16.05 673 -7.68 0.3110
2020-10-23 2020-09-30 13F IRON MTN INC COM 46284V101 27,201 -9,317 -25.51 729 -23.50 0.3844
2020-07-16 2020-06-30 13F IRON MTN INC COM 46284V101 36,518 2,039 5.91 953 16.08 0.5606
2020-04-14 2020-03-31 13F IRON MTN INC COM 46284V101 34,479 5,295 18.14 821 -11.72 0.5902
2020-01-14 2019-12-31 13F IRON MTN INC COM 46284V101 29,184 163 0.56 930 -1.06 0.4744
2019-10-21 2019-09-30 13F IRON MTN INC COM 46284V101 29,021 25,521 729.17 940 676.86 0.5100
2018-11-13 2018-09-30 13F/A-1 IRON MTN INC COM 46284V101 3,500 3,500 121 0.0680
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.