Iron Mountain Incorporated
DE ˙ DB ˙ US46284V1017
111,85 € ↑2,30 (2,10%)
2026-06-05
DEL PRIS
SecurityDE:I5M / Iron Mountain Incorporated
InstitutionM&t Bank Corp
Latest Disclosed Ownership81,486 shares
Latest Disclosed Value $ 8,322,981
M&t Bank Corp reports 2.47% decrease in ownership of I5M / Iron Mountain Incorporated

On May 12, 2026 - M&t Bank Corp filed a 13F-HR form disclosing ownership of 81,486 shares of Iron Mountain Incorporated (DE:I5M) valued at $7,234,327 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on January 30, 2026 disclosing 83,551 shares of Iron Mountain Incorporated. This represents a change in shares of -2.47% during the quarter. The current value of the position is $9,114,209 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)
2026-05-12 2026-03-31 13F IRON MTN INC DEL COM 46284V101 81,486 -2,065 -2.47 8,323 20.07 0.0067
2026-01-30 2025-12-31 13F/A-1 IRON MTN INC DEL COM 46284V101 83,551 24,690 41.95 6,931 15.52 0.0223
2026-01-28 2025-12-31 13F IRON MTN INC DEL COM 46284V101 36,136 -22,725 7,408 0.0044
2025-11-14 2025-09-30 13F IRON MTN INC DEL COM 46284V101 58,861 -27,466 -31.82 6,000 -32.23 0.0202
2025-08-13 2025-06-30 13F IRON MTN INC DEL COM 46284V101 86,327 1,132 1.33 8,855 20.81 0.0304
2025-04-30 2025-03-31 13F IRON MTN INC DEL COM 46284V101 85,195 -1,867 -2.14 7,330 -19.90 0.0267
2025-02-06 2024-12-31 13F IRON MTN INC DEL COM 46284V101 87,062 -1,153 -1.31 9,151 -12.71 0.0307
2024-11-19 2024-09-30 13F/A-1 IRON MTN INC DEL COM 46284V101 88,215 334 0.38 10,482 33.10 0.0345
2024-11-15 2024-09-30 13F IRON MTN INC DEL COM 46284V101 88,215 334 10,482 0.0063
2024-07-31 2024-06-30 13F IRON MTN INC DEL COM 46284V101 87,881 -1,358 -1.52 7,876 10.03 0.0269
2024-05-07 2024-03-31 13F IRON MTN INC DEL COM 46284V101 89,239 -3,459 -3.73 7,158 10.33 0.0249
2024-02-06 2023-12-31 13F IRON MTN INC DEL COM 46284V101 92,698 -1,008 -1.08 6,487 16.46 0.0238
2023-11-02 2023-09-30 13F IRON MTN INC DEL COM 46284V101 93,706 -8,170 -8.02 5,571 -3.78 0.0222
2023-08-09 2023-06-30 13F IRON MTN INC DEL COM 46284V101 101,876 1,526 1.52 5,789 9.02 0.0216
2023-05-11 2023-03-31 13F IRON MTN INC DEL COM 46284V101 100,350 -201 -0.20 5,310 5.92 0.0206
2023-02-13 2022-12-31 13F/A-1 IRON MTN INC DEL COM 46284V101 100,551 -437 -0.43 5,013 12.85 0.0202
2023-02-13 2022-12-31 13F IQVIA HLDGS COM 46284V101 100,832 -156 8,903 0.0358
2022-11-17 2022-09-30 13F/A-1 IRON MTN INC DEL COM 46284V101 100,988 -1,184 -1.16 4,442 -9.53 0.0197
2022-11-14 2022-09-30 13F IRON MTN INC DEL COM 46284V101 100,988 -1,184 4,393 0.0037
2022-08-05 2022-06-30 13F IRON MTN INC COM 46284V101 102,172 4,524 4.63 4,910 -9.26 0.0231
2022-05-09 2022-03-31 13F IRON MTN INC COM 46284V101 97,648 32,325 49.48 5,411 58.31 0.0239
2022-02-07 2021-12-31 13F IRON MTN INC COM 46284V101 65,323 5,696 9.55 3,418 31.97 0.0144
2021-10-28 2021-09-30 13F IRON MTN INC COM 46284V101 59,627 877 1.49 2,590 4.14 0.0117
2021-08-13 2021-06-30 13F IRON MTN INC COM 46284V101 58,750 3,935 7.18 2,487 22.63 0.0109
2021-05-06 2021-03-31 13F IRON MTN INC COM 46284V101 54,815 -1,633 -2.89 2,028 21.80 0.0088
2021-02-12 2020-12-31 13F IRON MTN INC COM 46284V101 56,448 -5,354 -8.66 1,665 0.60 0.0073
2020-11-06 2020-09-30 13F IRON MTN INC COM 46284V101 61,802 -384 -0.62 1,655 1.97 0.0081
2020-07-29 2020-06-30 13F IRON MTN INC COM 46284V101 62,186 -1,839 -2.87 1,623 6.50 0.0087
2020-05-14 2020-03-31 13F IRON MTN INC COM 46284V101 64,025 13,212 26.00 1,524 -5.93 0.0090
2020-02-07 2019-12-31 13F IRON MTN INC COM 46284V101 50,813 3,255 6.84 1,620 5.19 0.0076
2019-11-12 2019-09-30 13F IRON MTN INC COM 46284V101 47,558 -3,105 -6.13 1,540 -2.90 0.0077
2019-08-12 2019-06-30 13F IRON MTN INC COM 46284V101 50,663 58 0.11 1,586 -11.54 0.0083
2019-05-15 2019-03-31 13F IRON MTN INC COM 46284V101 50,605 -1,957 -3.72 1,793 5.22 0.0094
2019-02-01 2018-12-31 13F IRON MTN INC COM 46284V101 52,562 -11,270 -17.66 1,704 -22.65 0.0098
2018-11-09 2018-09-30 13F IRON MTN INC COM 46284V101 63,832 -352 -0.55 2,203 -1.96 0.0110
2018-08-10 2018-06-30 13F IRON MTN INC COM 46284V101 64,184 -3,994 -5.86 2,247 0.27 0.0121
2018-05-04 2018-03-31 13F IRON MTN INC COM 46284V101 68,178 -5,757 -7.79 2,241 -19.62 0.0120
2018-02-06 2017-12-31 13F IRON MTN INC COM 46284V101 73,935 -563 -0.76 2,788 -3.76 0.0146
2017-11-13 2017-09-30 13F IRON MTN INC COM 46284V101 74,498 21,771 41.29 2,897 59.88 0.0157
2017-08-11 2017-06-30 13F IRON MTN INC COM 46284V101 52,727 -1,640 -3.02 1,812 -6.55 0.0107
2017-05-10 2017-03-31 13F IRON MTN INC COM 46284V101 54,367 -10,660 -16.39 1,939 -8.15 0.0117
2017-02-14 2016-12-31 13F IRON MTN INC COM 46284V101 65,027 6,595 11.29 2,111 -3.74 0.0131
2016-11-04 2016-09-30 13F IRON MTN INC COM 46284V101 58,432 6,479 12.47 2,193 5.94 0.0140
2016-08-04 2016-06-30 13F IRON MTN INC COM 46284V101 51,953 7,919 17.98 2,070 38.55 0.0139
2016-05-11 2016-03-31 13F IRON MTN INC COM 46284V101 44,034 -3,543 -7.45 1,494 16.26 0.0101
2016-02-12 2015-12-31 13F IRON MTN INC COM 46284V101 47,577 5,314 12.57 1,285 -2.06 0.0085
2015-11-13 2015-09-30 13F IRON MTN INC COM 46284V101 42,263 4,025 10.53 1,312 10.62 0.0089
2015-08-14 2015-06-30 13F IRON MTN INC COM 46284V101 38,238 18,274 91.53 1,186 62.69 0.0072
2015-05-14 2015-03-31 13F IRON MTN INC COM 46284V101 19,964 -23,004 -53.54 729 -56.14 0.0045
2015-02-12 2014-12-31 13F IRON MTN COM 462846106 42,968 16,148 60.21 1,662 89.94 0.0104
2014-11-14 2014-09-30 13F IRON MTN COM 462846106 26,820 26,462 7,391.62 875 6,630.77 0.0061
2014-08-13 2014-06-30 13F IRON MTN INC PA COM COMMON 462846106 358 0 0.00 13 30.00 0.0005
2014-05-14 2014-03-31 13F IRON MTN INC PA COM COMMON STOCK 462846106 358 0 0.00 10 -9.09 0.0004
2014-02-12 2013-12-31 13F IRON MTN INC PA COM COMMON STOCK 462846106 358 0 0.00 11 10.00 0.0005
2013-11-13 2013-09-30 13F IRON MTN INC PA COM COMMON STOCK 462846106 358 0 0.00 10 0.00 0.0005
2013-07-30 2013-06-30 13F IRON MTN INC PA COM COMMON STOCK 462846106 358 358 10 0.0005
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.