Iron Mountain Incorporated
DE ˙ DB ˙ US46284V1017
108,60 € ↓ -0,40 (-0,37%)
2026-05-29
DEL PRIS
SecurityDE:I5M / Iron Mountain Incorporated
InstitutionPrudential Financial Inc
Latest Disclosed Ownership2,416,063 shares
Latest Disclosed Value $ 246,776,675
Prudential Financial Inc reports 4.57% increase in ownership of I5M / Iron Mountain Incorporated

On May 13, 2026 - Prudential Financial Inc filed a 13F-HR form disclosing ownership of 2,416,063 shares of Iron Mountain Incorporated (DE:I5M) valued at $214,498,073 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 2,310,481 shares of Iron Mountain Incorporated. This represents a change in shares of 4.57% during the quarter. The current value of the position is $262,384,442 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)
2026-05-13 2026-03-31 13F IRON MTN INC DEL COM 46284V101 2,416,063 105,582 4.57 246,777 28.76 0.1708
2026-02-13 2025-12-31 13F IRON MTN INC DEL COM 46284V101 2,310,481 196,864 9.31 191,654 -11.05 0.2314
2025-11-13 2025-09-30 13F IRON MTN INC DEL COM 46284V101 2,113,617 167,848 8.63 215,462 7.96 0.2561
2025-08-12 2025-06-30 13F IRON MTN INC DEL COM 46284V101 1,945,769 601,290 44.72 199,578 72.53 0.2578
2025-05-13 2025-03-31 13F IRON MTN INC DEL COM 46284V101 1,344,479 -18,734 -1.37 115,679 -19.27 0.1648
2025-02-11 2024-12-31 13F IRON MTN INC DEL COM 46284V101 1,363,213 -244,936 -15.23 143,287 -25.02 0.1964
2024-11-14 2024-09-30 13F IRON MTN INC DEL COM 46284V101 1,608,149 -494,007 -23.50 191,096 1.43 0.2692
2024-08-13 2024-06-30 13F IRON MTN INC DEL COM 46284V101 2,102,156 239,214 12.84 188,395 26.08 0.2828
2024-05-14 2024-03-31 13F IRON MTN INC DEL COM 46284V101 1,862,942 -366,593 -16.44 149,427 -4.04 0.2104
2024-02-13 2023-12-31 13F IRON MTN INC DEL COM 46284V101 2,229,535 986,016 79.29 155,718 110.64 0.2352
2023-11-13 2023-09-30 13F IRON MTN INC DEL COM 46284V101 1,243,519 -71,407 -5.43 73,927 -1.05 0.1160
2023-08-11 2023-06-30 13F IRON MTN INC DEL COM 46284V101 1,314,926 844,211 179.35 74,714 217.26 0.1088
2023-05-12 2023-03-31 13F IRON MTN INC DEL COM 46284V101 470,715 213,777 83.20 23,551 83.87 0.0369
2023-02-14 2022-12-31 13F IRON MTN INC DEL COM 46284V101 256,938 -217,876 -45.89 12,808 -38.47 0.0216
2022-11-04 2022-09-30 13F IRON MTN INC DEL COM 46284V101 474,814 228,410 92.70 20,817 74.65 0.0353
2022-08-15 2022-06-30 13F IRON MTN INC COM 46284V101 246,404 -3,030 -1.21 11,919 -13.76 0.0189
2022-05-13 2022-03-31 13F IRON MTN INC COM 46284V101 249,434 -1,233 -0.49 13,821 13.79 0.0184
2022-02-14 2021-12-31 13F IRON MTN INC COM 46284V101 250,667 4,722 1.92 12,146 11.39 0.0151
2021-11-15 2021-09-30 13F IRON MTN INC COM 46284V101 245,945 -173,960 -41.43 10,904 -38.64 0.0152
2021-08-16 2021-06-30 13F IRON MTN INC COM 46284V101 419,905 -13,275 -3.06 17,770 10.84 0.0244
2021-05-12 2021-03-31 13F IRON MTN INC COM 46284V101 433,180 124,063 40.13 16,032 75.92 0.0240
2021-08-16 2020-12-31 13F/A-1 IRON MTN INC COM 0029 46284V101 309,117 309,037 386,296.25 9,113 455,550.00 0.0153
2021-02-16 2020-12-31 13F IRON MTN INC COM 46284V101 309,117 309,037 9,113 0.0153
2021-08-05 2020-09-30 13F/A-1 IRON MTN INC COM 46284V101 80 -96 -54.55 2 -60.00 0.0003
2020-11-16 2020-09-30 13F IRON MTN INC COM 46284V101 315,146 314,970 8,443 0.0159
2021-08-05 2020-06-30 13F/A-1 IRON MTN INC COM 0026 46284V101 176 77 77.78 5 150.00 0.0009
2020-08-12 2020-06-30 13F IRON MTN INC COM 46284V101 220,536 220,437 5,756 0.0111
2021-08-05 2020-03-31 13F/A-1 IRON MTN INC COM 0023 46284V101 99 2 2.06 2 -33.33 0.0005
2020-05-12 2020-03-31 13F IRON MTN INC COM 46284V101 268,248 268,151 6,384 0.0141
2021-08-05 2019-12-31 13F/A-1 IRON MTN INC COM 0031 46284V101 97 -7 -6.73 3 0.00 0.0008
2020-02-11 2019-12-31 13F IRON MTN INC COM 46284V101 268,528 268,424 8,558 0.0127
2021-08-05 2019-09-30 13F/A-1 IRON MTN INC COM 0032 46284V101 104 -29 -21.80 3 -25.00 0.0010
2019-11-13 2019-09-30 13F IRON MTN INC COM 46284V101 257,878 257,745 8,353 0.0133
2021-08-05 2019-06-30 13F/A-1 IRON MTN INC COM 46284V101 133 -25 -15.82 4 -33.33 0.0014
2019-08-08 2019-06-30 13F IRON MTN INC COM 46284V101 259,438 259,280 8,120 0.0127
2021-08-05 2019-03-31 13F/A-1 IRON MTN INC COM 46284V101 158 108 216.00 6 200.00 0.0025
2019-05-15 2019-03-31 13F IRON MTN INC COM 46284V101 260,003 259,953 9,220 0.0154
2021-08-05 2018-12-31 13F/A-1 IRON MTN INC COM 46284V101 50 -303,361 -99.98 2 -99.98 0.0016
2019-02-07 2018-12-31 13F IRON MTN INC COM 46284V101 306,663 3,252 9,939 0.0175
2018-11-07 2018-09-30 13F IRON MTN INC COM 46284V101 303,411 -2,120 -0.69 10,473 -2.09 0.0154
2018-08-13 2018-06-30 13F IRON MTN INC COM 46284V101 305,531 -930 -0.30 10,697 6.23 0.0160
2018-05-04 2018-03-31 13F IRON MTN INC COM 46284V101 306,461 -67,091 -17.96 10,070 -28.55 0.0153
2018-02-13 2017-12-31 13F IRON MTN INC COM 46284V101 373,552 31,070 9.07 14,094 5.79 0.0192
2017-11-02 2017-09-30 13F IRON MTN INC COM 46284V101 342,482 9,840 2.96 13,323 16.57 0.0220
2017-08-07 2017-06-30 13F IRON MTN INC COM 46284V101 332,642 -4,590 -1.36 11,429 -4.99 0.0170
2017-05-10 2017-03-31 13F IRON MTN INC COM 46284V101 337,232 4,900 1.47 12,029 11.43 0.0188
2017-02-07 2016-12-31 13F IRON MTN INC COM 46284V101 332,332 -9,390 -2.75 10,795 -15.83 0.0174
2016-11-04 2016-09-30 13F IRON MTN INC COM 46284V101 341,722 22,451 7.03 12,825 0.85 0.0212
2016-08-09 2016-06-30 13F IRON MTN INC COM 46284V101 319,271 87,895 37.99 12,717 62.08 0.0214
2016-05-09 2016-03-31 13F IRON MTN INC COM 46284V101 231,376 -1,600 -0.69 7,846 24.70 0.0140
2016-02-12 2015-12-31 13F IRON MTN INC COM 46284V101 232,976 3,000 1.30 6,292 -11.80 0.0114
2015-11-10 2015-09-30 13F IRON MTN INC COM 46284V101 229,976 -40,600 -15.01 7,134 -14.95 0.0141
2015-08-06 2015-06-30 13F IRON MTN INC COM 46284V101 270,576 29,500 12.24 8,388 -4.62 0.0149
2015-05-01 2015-03-31 13F IRON MTN INC COM 46284V101 241,076 -810 -0.33 8,794 -5.96 0.0152
2015-02-06 2014-12-31 13F IRON MTN COM 462846106 241,886 11,245 4.88 9,351 24.18 0.0170
2014-11-12 2014-09-30 13F IRON MTN COM 462846106 230,641 -21,510 -8.53 7,530 -15.76 0.0142
2014-08-13 2014-06-30 13F IRON MTN COM 462846106 252,151 2,260 0.90 8,939 29.76 0.0158
2014-05-14 2014-03-31 13F IRON MTN COM 462846106 249,891 32,027 14.70 6,889 4.19 0.0128
2014-02-11 2013-12-31 13F IRON MTN COM 462846106 217,864 -7,400 -3.29 6,612 8.62 0.0131
2013-11-07 2013-09-30 13F IRON MTN COM 462846106 225,264 2,145 0.96 6,087 2.53 0.0129
2013-08-07 2013-06-30 13F IRON MTN COM 462846106 223,119 223,119 5,937 0.0132
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.