Iron Mountain Incorporated
US ˙ NYSE ˙ US46284V1017

SecurityIRM / Iron Mountain Incorporated
InstitutionCommonwealth Equity Services, Llc
Latest Disclosed Ownership166,586 shares
Latest Disclosed Value $ 13,818,294
Commonwealth Equity Services, Llc reports 5.26% decrease in ownership of IRM / Iron Mountain Incorporated

On February 12, 2026 - Commonwealth Equity Services, Llc filed a 13F-HR form disclosing ownership of 166,586 shares of Iron Mountain Incorporated (US:IRM) valued at $13,818,309 USD as of December 31, 2025. The entity filed a previous 13F-HR on October 22, 2025 disclosing 175,828 shares of Iron Mountain Incorporated. This represents a change in shares of -5.26% during the quarter. The current value of the position is $21,314,679 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)
2026-02-12 2025-12-31 13F IRON MTN INC DEL COM 46284V101 166,586 -9,242 -5.26 13,818 81,182.35 0.0184
2025-10-22 2025-09-30 13F IRON MTN INC DEL COM 46284V101 175,828 -27,960 -13.72 18 -15.00 0.0232
2025-08-06 2025-06-30 13F IRON MTN INC DEL COM 46284V101 203,788 -5,564 -2.66 21 11.11 0.0276
2025-05-09 2025-03-31 13F IRON MTN INC DEL COM 46284V101 209,352 -15,711 -6.98 18 -21.74 0.0255
2025-02-10 2024-12-31 13F IRON MTN INC DEL COM 46284V101 225,063 2,361 1.06 24 -11.54 0.0346
2024-10-18 2024-09-30 13F IRON MTN INC DEL COM 46284V101 222,702 -7,834 -3.40 26 30.00 0.0401
2024-07-31 2024-06-30 13F IRON MTN INC DEL COM 46284V101 230,536 17,362 8.14 21 17.65 0.0327
2024-04-29 2024-03-31 13F IRON MTN INC DEL COM 46284V101 213,174 12,029 5.98 17 21.43 0.0284
2024-02-06 2023-12-31 13F IRON MTN INC DEL COM 46284V101 201,145 2,843 1.43 14 27.27 0.0258
2023-10-23 2023-09-30 13F IRON MTN INC DEL COM 46284V101 198,302 10,063 5.35 12 10.00 0.0244
2023-08-10 2023-06-30 13F IRON MTN INC DEL COM 46284V101 188,239 -3,474 -1.81 11 0.00 0.0218
2023-05-11 2023-03-31 13F IRON MTN INC DEL COM 46284V101 191,713 5,191 2.78 10 11.11 0.0213
2023-02-07 2022-12-31 13F IRON MTN INC DEL COM 46284V101 186,522 2,107 1.14 9 -99.89 0.0224
2022-11-14 2022-09-30 13F IRON MTN INC DEL COM 46284V101 184,415 4,085 2.27 8,108 -7.65 0.0209
2022-07-19 2022-06-30 13F IRON MTN INC COM 46284V101 180,330 -3,853 -2.09 8,780 -13.96 0.0229
2022-05-04 2022-03-31 13F IRON MTN INC COM 46284V101 184,183 -26,705 -12.66 10,205 -7.52 0.0233
2022-01-31 2021-12-31 13F IRON MTN INC COM 46284V101 210,888 -26,109 -11.02 11,035 7.17 0.0249
2021-10-29 2021-09-30 13F IRON MTN INC COM 46284V101 236,997 43,777 22.66 10,297 25.93 0.0258
2021-08-11 2021-06-30 13F IRON MTN INC COM 46284V101 193,220 29,048 17.69 8,177 34.58 0.0208
2021-05-04 2021-03-31 13F IRON MTN INC COM 46284V101 164,172 -17,530 -9.65 6,076 13.44 0.0172
2021-02-11 2020-12-31 13F IRON MTN INC COM 46284V101 181,702 8,750 5.06 5,356 15.61 0.0161
2020-11-05 2020-09-30 13F IRON MTN INC COM 46284V101 172,952 3,391 2.00 4,633 4.70 0.0158
2020-08-12 2020-06-30 13F IRON MTN INC COM 46284V101 169,561 2,760 1.65 4,425 11.49 0.0167
2020-05-11 2020-03-31 13F IRON MTN INC COM 46284V101 166,801 -19,000 -10.23 3,969 -32.97 0.0185
2020-02-05 2019-12-31 13F IRON MTN INC COM 46284V101 185,801 37,904 25.63 5,921 23.61 0.0225
2019-10-30 2019-09-30 13F IRON MTN INC COM 46284V101 147,897 36,168 32.37 4,790 36.97 0.0204
2019-07-19 2019-06-30 13F IRON MTN INC COM 46284V101 111,729 26,584 31.22 3,497 15.83 0.0154
2019-05-13 2019-03-31 13F IRON MTN INC COM 46284V101 85,145 6,709 8.55 3,019 18.76 0.0139
2019-02-11 2018-12-31 13F IRON MTN INC COM 46284V101 78,436 14,190 22.09 2,542 14.66 0.0135
2018-11-06 2018-09-30 13F IRON MTN INC COM 46284V101 64,246 7,425 13.07 2,217 11.46 0.0106
2018-07-31 2018-06-30 13F IRON MTN INC COM 46284V101 56,821 8,848 18.44 1,989 26.21 0.0104
2018-05-14 2018-03-31 13F IRON MTN INC COM 46284V101 47,973 12,384 34.80 1,576 17.35 0.0086
2018-02-12 2017-12-31 13F IRON MTN INC COM 46284V101 35,589 35,589 1,343 0.0073
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.