Iron Mountain Incorporated
DE ˙ DB ˙ US46284V1017
111,85 € ↑2,30 (2,10%)
2026-06-05
DEL PRIS
SecurityDE:I5M / Iron Mountain Incorporated
InstitutionFinancial Management Professionals, Inc.
Latest Disclosed Ownership5,337 shares
Latest Disclosed Value $ 549,732
Financial Management Professionals, Inc. reports 1.37% increase in ownership of I5M / Iron Mountain Incorporated

On April 15, 2026 - Financial Management Professionals, Inc. filed a 13F-HR form disclosing ownership of 5,337 shares of Iron Mountain Incorporated (DE:I5M) valued at $473,819 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 5,265 shares of Iron Mountain Incorporated. This represents a change in shares of 1.37% during the quarter. The current value of the position is $596,943 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 New REIT REIT 46284V101 5,337 72 1.37 550 24.49 0.0617
2026-01-27 2025-12-31 13F Iron MTN Inc New REIT REIT 46284V101 5,265 -8 -0.15 441 -18.48 0.0455
2025-10-15 2025-09-30 13F Iron MTN Inc New REIT REIT 46284V101 5,273 33 0.63 542 0.00 0.0564
2025-07-15 2025-06-30 13F Iron MTN Inc New REIT REIT 46284V101 5,240 -334 -5.99 542 12.94 0.0609
2025-04-10 2025-03-31 13F Iron MTN Inc New REIT REIT 46284V101 5,574 140 2.58 480 -16.11 0.0613
2025-01-15 2024-12-31 13F Iron MTN Inc New REIT REIT 46284V101 5,434 589 12.16 571 0.0722
2024-10-24 2024-09-30 13F Iron MTN Inc New REIT REIT 46284V101 4,845 71 1.49 1 0.0715
2024-07-12 2024-06-30 13F Iron MTN Inc New REIT REIT 46284V101 4,774 408 9.34 0 0.0587
2024-04-16 2024-03-31 13F Iron MTN Inc New REIT REIT 46284V101 4,366 -1,585 -26.63 0 0.0516
2024-01-12 2023-12-31 13F Iron MTN Inc New REIT REIT 46284V101 5,951 621 11.65 0 0.0678
2023-10-13 2023-09-30 13F Iron MTN Inc New REIT REIT 46284V101 5,330 -280 -4.99 0 0.0557
2023-07-10 2023-06-30 13F Iron MTN Inc New REIT REIT 46284V101 5,610 496 9.70 0 0.0534
2023-04-13 2023-03-31 13F Iron MTN Inc New REIT REIT 46284V101 5,114 520 11.32 0 0.0523
2023-01-11 2022-12-31 13F Iron MTN Inc New REIT REIT 46284V101 4,594 723 18.68 0 -100.00 0.0469
2022-10-27 2022-09-30 13F Iron MTN Inc New REIT REIT 46284V101 3,871 837 27.59 170 14.86 0.0389
2022-07-12 2022-06-30 13F IRON MTN INC COM 46284V101 3,034 438 16.87 148 2.78 0.0359
2022-04-27 2022-03-31 13F IRON MTN INC COM 46284V101 2,596 660 34.09 144 42.57 0.0312
2022-01-28 2021-12-31 13F IRON MTN INC COM 46284V101 1,936 53 2.81 101 23.17 0.0214
2021-11-02 2021-09-30 13F IRON MTN INC COM 46284V101 1,883 31 1.67 82 5.13 0.0189
2021-08-05 2021-06-30 13F IRON MTN INC COM 46284V101 1,852 45 2.49 78 16.42 0.0201
2021-04-26 2021-03-31 13F IRON MTN INC COM 46284V101 1,807 1,743 2,723.44 67 3,250.00 0.0179
2021-02-03 2020-12-31 13F IRON MTN INC COM 46284V101 64 0 0.00 2 0.00 0.0006
2020-10-26 2020-09-30 13F IRON MTN INC COM 46284V101 64 11 20.75 2 100.00 0.0007
2020-07-21 2020-06-30 13F IRON MTN INC COM 46284V101 53 53 1 0.0003
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.