Iron Mountain Incorporated
DE ˙ DB ˙ US46284V1017
108,60 € ↓ -0,40 (-0,37%)
2026-05-29
DEL PRIS
SecurityDE:I5M / Iron Mountain Incorporated
InstitutionHm Payson & Co
Latest Disclosed Ownership12,526 shares
Latest Disclosed Value $ 1,279,406
Hm Payson & Co ownership in I5M / Iron Mountain Incorporated

On April 13, 2026 - Hm Payson & Co filed a 13F-HR form disclosing ownership of 12,526 shares of Iron Mountain Incorporated (DE:I5M) valued at $1,112,058 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 12,526 shares of Iron Mountain Incorporated. This represents a change in shares of 0.00% during the quarter. The current value of the position is $1,360,324 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)
2026-04-13 2026-03-31 13F IRON MTN INC DEL COM 46284V101 12,526 0 0.00 1,279 23.10 0.0096
2026-02-12 2025-12-31 13F IRON MTN INC DEL COM 46284V101 12,526 0 0.00 1,039 -18.57 0.0147
2025-10-17 2025-09-30 13F IRON MTN INC DEL COM 46284V101 12,526 0 0.00 1,277 -0.62 0.0184
2025-10-17 2025-06-30 13F IRON MTN INC DEL COM 46284V101 12,526 0 0.00 1,285 19.22 0.0203
2025-04-29 2025-03-31 13F IRON MTN INC DEL COM 46284V101 12,526 265 2.16 1,078 -16.38 0.0189
2025-02-07 2024-12-31 13F IRON MTN INC DEL COM 46284V101 12,261 0 0.00 1,289 -11.54 0.0219
2024-10-28 2024-09-30 13F IRON MTN INC DEL COM 46284V101 12,261 0 0.00 1,457 32.60 0.0250
2024-08-13 2024-06-30 13F IRON MTN INC DEL COM 46284V101 12,261 0 0.00 1,099 11.70 0.0200
2024-06-20 2024-03-31 13F IRON MTN INC DEL COM 46284V101 12,261 0 0.00 983 14.57 0.0183
2024-02-13 2023-12-31 13F IRON MTN INC DEL COM 46284V101 12,261 0 0.00 858 17.86 0.0178
2023-11-06 2023-09-30 13F IRON MTN INC DEL COM 46284V101 12,261 -3 -0.02 729 4.60 0.0171
2023-07-17 2023-06-30 13F IRON MTN INC DEL COM 46284V101 12,264 0 0.00 697 7.41 0.0156
2023-04-18 2023-03-31 13F IRON MTN INC DEL COM 46284V101 12,264 0 0.00 649 6.06 0.0156
2023-02-06 2022-12-31 13F IRON MTN INC DEL COM 46284V101 12,264 0 0.00 611 13.36 0.0152
2022-10-25 2022-09-30 13F IRON MTN INC DEL COM 46284V101 12,264 0 0.00 539 -9.72 0.0148
2022-08-15 2022-06-30 13F IRON MTN INC COM 46284V101 12,264 1 0.01 597 -12.21 0.0153
2022-05-12 2022-03-31 13F IRON MTN INC COM 46284V101 12,263 0 0.00 680 5.92 0.0155
2022-02-15 2021-12-31 13F IRON MTN INC COM 46284V101 12,263 0 0.00 642 20.45 0.0140
2021-11-30 2021-09-30 13F IRON MTN INC COM 46284V101 12,263 0 0.00 533 2.70 0.0130
2021-08-17 2021-06-30 13F IRON MTN INC COM 46284V101 12,263 0 0.00 519 14.32 0.0127
2021-06-15 2021-03-31 13F IRON MTN INC COM 46284V101 12,263 0 0.00 454 25.41 0.0121
2021-03-10 2020-12-31 13F IRON MTN INC COM 46284V101 12,263 -98 -0.79 362 9.37 0.0100
2020-12-21 2020-09-30 13F IRON MTN INC COM 46284V101 12,361 100 0.82 331 3.44 0.0102
2020-08-13 2020-06-30 13F IRON MTN INC COM 46284V101 12,261 0 0.00 320 9.59 0.0107
2020-07-01 2020-03-31 13F IRON MTN INC COM 46284V101 12,261 -643 -4.98 292 -28.95 0.0115
2020-02-18 2019-12-31 13F IRON MTN INC COM 46284V101 12,904 0 0.00 411 -1.67 0.0132
2019-11-12 2019-09-30 13F IRON MTN INC COM 46284V101 12,904 10,723 491.66 418 514.71 0.0147
2019-08-15 2019-06-30 13F IRON MTN INC COM 46284V101 2,181 2,181 68 0.0024
2017-02-15 2016-12-31 13F IRON MTN COMMON STOCK 46284V101 0 -6,303 -100.00 0 -100.00
2016-11-14 2016-09-30 13F IRON MTN COMMON STOCK 46284V101 6,303 -1,353 -17.67 237 -22.30 0.0116
2016-08-08 2016-06-30 13F IRON MTN COMMON STOCK 46284V101 7,656 0 0.00 305 17.31 0.0152
2016-05-19 2016-03-31 13F IRON MTN COMMON STOCK 46284V101 7,656 -893 -10.45 260 12.55 0.0135
2016-02-23 2015-12-31 13F IRON MTN COMMON STOCK 46284V101 8,549 -641 -6.97 231 -18.95 0.0119
2015-11-02 2015-09-30 13F IRON MTN COMMON STOCK 46284V101 9,190 -857 -8.53 285 -8.36 0.0154
2015-08-11 2015-06-30 13F IRON MTN COMMON STOCK 46284V101 10,047 -7,274 -42.00 311 -50.79 0.0155
2015-05-06 2015-03-31 13F IRON MTN COMMON STOCK 46284V101 17,321 -5,355 -23.62 632 -27.94 0.0316
2015-02-10 2014-12-31 13F IRON MOUNTAIN COMMON STOCK 462846106 22,676 1,519 7.18 877 26.92 0.0434
2014-11-12 2014-09-30 13F IRON MOUNTAIN COMMON STOCK 462846106 21,157 -1,730 -7.56 691 -14.80 0.0354
2014-08-13 2014-06-30 13F IRON MOUNTAIN COMMON STOCK 462846106 22,887 -129,210 -84.95 811 -80.66 0.0417
2014-05-07 2014-03-31 13F IRON MOUNTAIN COMMON STOCK 462846106 152,097 4,066 2.75 4,193 -6.68 0.2219
2014-02-10 2013-12-31 13F IRON MOUNTAIN COMMON STOCK 462846106 148,031 -135,141 -47.72 4,493 -41.28 0.2407
2013-11-13 2013-09-30 13F IRON MOUNTAIN COMMON STOCK 462846106 283,172 -8,992 -3.08 7,652 -1.57 0.4437
2013-08-13 2013-06-30 13F IRON MOUNTAIN COMMON STOCK 462846106 292,164 292,164 7,774 0.4666
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.