Iron Mountain Incorporated
MX ˙ BMV ˙ US46284V1017
SecurityMX:IRM1 / Iron Mountain Incorporated
InstitutionOppenheimer Asset Management Inc.
Latest Disclosed Ownership19,458 shares
Latest Disclosed Value $ 1,987,440
Oppenheimer Asset Management Inc. reports 1.39% decrease in ownership of IRM1 / Iron Mountain Incorporated

On April 23, 2026 - Oppenheimer Asset Management Inc. filed a 13F-HR form disclosing ownership of 19,458 shares of Iron Mountain Incorporated (MX:IRM1) valued at $1,987,440 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 19,732 shares of Iron Mountain Incorporated. This represents a change in shares of -1.39% during the quarter.

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)
2026-04-23 2026-03-31 13F IRON MTN INC DEL COM 46284V101 19,458 -274 -1.39 1,987 21.45 0.0057
2026-02-02 2025-12-31 13F IRON MTN INC DEL COM 46284V101 19,732 2,955 17.61 1,637 -4.33 0.0201
2025-11-06 2025-09-30 13F IRON MTN INC DEL COM 46284V101 16,777 2,761 19.70 1,710 19.00 0.0188
2025-07-31 2025-06-30 13F IRON MTN INC DEL COM 46284V101 14,016 1,173 9.13 1,438 30.05 0.0165
2025-04-23 2025-03-31 13F IRON MTN INC DEL COM 46284V101 12,843 -1,530 -10.64 1,105 -26.82 0.0137
2025-02-05 2024-12-31 13F IRON MTN INC DEL COM 46284V101 14,373 -4,352 -23.24 1,511 -32.13 0.0184
2024-11-05 2024-09-30 13F IRON MTN INC DEL COM 46284V101 18,725 -4,521 -19.45 2,225 6.82 0.0268
2024-08-08 2024-06-30 13F IRON MTN INC DEL COM 46284V101 23,246 -788 -3.28 2,083 8.10 0.0266
2024-05-07 2024-03-31 13F IRON MTN INC DEL COM 46284V101 24,034 -1,889 -7.29 1,928 6.23 0.0282
2024-02-13 2023-12-31 13F IRON MTN INC DEL COM 46284V101 25,923 17,608 211.76 1,814 267.21 0.0252
2023-11-08 2023-09-30 13F IRON MTN INC DEL COM 46284V101 8,315 -4,053 -32.77 494 -29.63 0.0076
2023-08-03 2023-06-30 13F IRON MTN INC DEL COM 46284V101 12,368 4,091 49.43 703 60.64 0.0103
2023-05-10 2023-03-31 13F IRON MTN INC DEL COM 46284V101 8,277 8,277 438 0.0067
2020-08-11 2020-06-30 13F IRON MTN INC COM 46284V101 0 -1,900 -100.00 0 -100.00
2020-05-08 2020-03-31 13F IRON MTN INC COM 46284V101 1,900 226 13.50 45 -15.09 0.0011
2020-02-07 2019-12-31 13F IRON MTN INC COM 46284V101 1,674 -26 -1.53 53 -3.64 0.0011
2019-10-31 2019-09-30 13F IRON MTN INC COM 46284V101 1,700 -14,380 -89.43 55 -89.09 0.0012
2019-08-09 2019-06-30 13F IRON MTN INC COM 46284V101 16,080 3,249 25.32 504 10.77 0.0111
2019-04-24 2019-03-31 13F IRON MTN INC COM 46284V101 12,831 -10,296 -44.52 455 -39.33 0.0102
2019-01-30 2018-12-31 13F IRON MTN INC COM 46284V101 23,127 902 4.06 750 -2.34 0.0186
2018-10-26 2018-09-30 13F IRON MTN INC COM 46284V101 22,225 3,318 17.55 768 16.01 0.0170
2018-08-10 2018-06-30 13F IRON MTN INC COM 46284V101 18,907 9,885 109.57 662 123.65 0.0162
2018-05-09 2018-03-31 13F IRON MTN INC COM 46284V101 9,022 -4,711 -34.30 296 -44.57 0.0074
2018-02-07 2017-12-31 13F IRON MTN INC COM 46284V101 13,733 0 0.00 534 0.00 0.0142
2017-11-14 2017-09-30 13F IRON MTN INC COM 46284V101 13,733 -395 -2.80 534 10.10 0.0139
2017-08-09 2017-06-30 13F IRON MTN INC COM 46284V101 14,128 5,476 63.29 485 57.47 0.0134
2017-05-15 2017-03-31 13F IRON MTN INC COM 46284V101 8,652 8,652 308 0.0088
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.