Iron Mountain Incorporated
DE ˙ DB ˙ US46284V1017
108,60 € ↓ -0,40 (-0,37%)
2026-05-29
DEL PRIS
SecurityDE:I5M / Iron Mountain Incorporated
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership565,255 shares
Latest Disclosed Value $ 46,887,902
Alliancebernstein L.p. reports 3.75% increase in ownership of I5M / Iron Mountain Incorporated

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 565,255 shares of Iron Mountain Incorporated (DE:I5M) valued at $50,183,339 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 544,810 shares of Iron Mountain Incorporated. This represents a change in shares of 3.75% during the quarter. The current value of the position is $61,386,693 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)
2026-05-15 2026-03-31 13F IRON MTN INC DEL COM 46284V101 565,255 20,445 3.75 46,888 3.75 0.0152
2026-02-17 2025-12-31 13F IRON MTN INC DEL COM 46284V101 544,810 -11,184 -2.01 45,192 -20.27 0.0143
2025-11-14 2025-09-30 13F IRON MTN INC DEL COM 46284V101 555,994 -5,292 -0.94 56,678 -1.55 0.0178
2025-08-14 2025-06-30 13F IRON MTN INC DEL COM 46284V101 561,286 -38,428 -6.41 57,571 11.57 0.0188
2025-05-15 2025-03-31 13F IRON MTN INC DEL COM 46284V101 599,714 43,882 7.89 51,599 -11.68 0.0187
2025-02-12 2024-12-31 13F IRON MTN INC DEL COM 46284V101 555,832 -53,400 -8.77 58,424 -19.30 0.0198
2024-11-14 2024-09-30 13F IRON MTN INC DEL COM 46284V101 609,232 -5,614 -0.91 72,395 31.38 0.0243
2024-08-14 2024-06-30 13F IRON MTN INC DEL COM 46284V101 614,846 239,561 63.83 55,102 83.06 0.0192
2024-05-14 2024-03-31 13F IRON MTN INC DEL COM 46284V101 375,285 -32,004 -7.86 30,102 5.61 0.0107
2024-02-14 2023-12-31 13F IRON MTN INC DEL COM 46284V101 407,289 42,479 11.64 28,502 31.42 0.0110
2023-11-14 2023-09-30 13F IRON MTN INC DEL COM 46284V101 364,810 -32,765 -8.24 21,688 -4.00 0.0092
2023-08-15 2023-06-30 13F IRON MTN INC DEL COM 46284V101 397,575 3,186 0.81 22,590 8.26 0.0092
2023-05-15 2023-03-31 13F IRON MTN INC DEL COM 46284V101 394,389 -31,460 -7.39 20,867 -1.70 0.0089
2023-02-15 2022-12-31 13F IRON MTN INC DEL COM 46284V101 425,849 -32,402 -7.07 21,229 5.36 0.0096
2022-11-15 2022-09-30 13F IRON MTN INC DEL COM 46284V101 458,251 -513 -0.11 20,149 -9.80 0.0098
2022-08-15 2022-06-30 13F IRON MTN INC COM 46284V101 458,764 -35,930 -7.26 22,337 -18.51 0.0102
2022-05-13 2022-03-31 13F IRON MTN INC COM 46284V101 494,694 8,818 1.81 27,411 7.81 0.0106
2022-02-14 2021-12-31 13F IRON MTN INC COM 46284V101 485,876 -53,824 -9.97 25,426 8.43 0.0090
2021-11-10 2021-09-30 13F IRON MTN INC COM 46284V101 539,700 -38,160 -6.60 23,450 -4.11 0.0093
2021-07-30 2021-06-30 13F IRON MTN INC COM 46284V101 577,860 96,343 20.01 24,455 37.23 0.0098
2021-05-06 2021-03-31 13F IRON MTN INC COM 46284V101 481,517 1,893 0.39 17,821 26.04 0.0078
2021-02-08 2020-12-31 13F IRON MTN INC COM 46284V101 479,624 -33,533 -6.53 14,139 2.85 0.0067
2020-11-12 2020-09-30 13F IRON MTN INC COM 46284V101 513,157 -9,990 -1.91 13,747 0.68 0.0074
2020-08-13 2020-06-30 13F IRON MTN INC COM 46284V101 523,147 -22,084 -4.05 13,654 5.23 0.0080
2020-05-14 2020-03-31 13F IRON MTN INC COM 46284V101 545,231 -1,182 -0.22 12,976 -25.49 0.0093
2020-02-18 2019-12-31 13F IRON MTN INC COM 46284V101 546,413 20,140 3.83 17,414 2.16 0.0099
2019-11-14 2019-09-30 13F IRON MTN INC COM 46284V101 526,273 -4,526 -0.85 17,046 2.60 0.0106
2019-08-14 2019-06-30 13F IRON MTN INC COM 46284V101 530,799 2,260 0.43 16,614 -11.35 0.0103
2019-05-14 2019-03-31 13F IRON MTN INC COM 46284V101 528,539 14,896 2.90 18,742 12.58 0.0122
2019-02-13 2018-12-31 13F IRON MTN INC COM 46284V101 513,643 7,572 1.50 16,647 -4.71 0.0124
2018-11-08 2018-09-30 13F IRON MTN INC COM 46284V101 506,071 4,247 0.85 17,470 -0.56 0.0114
2018-08-13 2018-06-30 13F IRON MTN INC COM 46284V101 501,824 -48,365 -8.79 17,569 -2.82 0.0122
2018-05-14 2018-03-31 13F IRON MTN INC COM 46284V101 550,189 -4,536 -0.82 18,079 -13.62 0.0131
2018-02-13 2017-12-31 13F IRON MTN INC COM 46284V101 554,725 7,507 1.37 20,930 -1.68 0.0150
2017-11-13 2017-09-30 13F IRON MTN INC COM 46284V101 547,218 32,928 6.40 21,287 20.46 0.0159
2017-08-10 2017-06-30 13F IRON MTN INC COM 46284V101 514,290 -11,069 -2.11 17,671 -5.70 0.0137
2017-05-11 2017-03-31 13F IRON MTN INC COM 46284V101 525,359 30,030 6.06 18,740 16.48 0.0149
2017-02-13 2016-12-31 13F IRON MTN INC COM 46284V101 495,329 -18,478 -3.60 16,088 -16.57 0.0134
2016-11-10 2016-09-30 13F IRON MTN INC COM 46284V101 513,807 32,530 6.76 19,283 0.59 0.0163
2016-08-11 2016-06-30 13F IRON MTN INC COM 46284V101 481,277 126,521 35.66 19,169 59.34 0.0165
2016-05-13 2016-03-31 13F IRON MTN INC COM 46284V101 354,756 -1,671 -0.47 12,030 24.96 0.0102
2016-02-16 2015-12-31 13F/A-1 IRON MTN INC COM 46284V101 356,427 -1,611 -0.45 9,627 -13.32 0.0082
2016-02-12 2015-12-31 13F IRON MTN INC COM 46284V101 356,427 11,056
2015-11-13 2015-09-30 13F IRON MTN INC COM 46284V101 358,038 1,588 0.45 11,106 0.51 0.0095
2015-08-14 2015-06-30 13F IRON MTN INC COM 46284V101 356,450 12,241 3.56 11,050 -12.00 0.0091
2015-05-13 2015-03-31 13F IRON MOUNTAIN COM 46284V101 344,209 -3,158 -0.91 12,557 -6.49 0.0102
2015-02-13 2014-12-31 13F IRON MOUNTAIN COM 462846106 347,367 20,004 6.11 13,429 25.65 0.0112
2014-11-13 2014-09-30 13F IRON MOUNTAIN COM 462846106 327,363 3,327 1.03 10,688 -6.96 0.0090
2014-08-13 2014-06-30 13F IRON MOUNTAIN COM 462846106 324,036 -144,006 -30.77 11,487 -10.98 0.0097
2014-05-13 2014-03-31 13F IRON MOUNTAIN COM 462846106 468,042 148,403 46.43 12,904 33.02 0.0111
2014-02-13 2013-12-31 13F IRON MOUNTAIN COM 462846106 319,639 -5,100 -1.57 9,701 10.57 0.0087
2013-11-14 2013-09-30 13F IRON MOUNTAIN COM 462846106 324,739 4,491 1.40 8,774 2.96 0.0087
2013-08-13 2013-06-30 13F IRON MOUNTAIN COM 462846106 320,248 320,248 8,522 0.0090
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.