Iron Mountain Incorporated
MX ˙ BMV ˙ US46284V1017
SecurityMX:IRM1 / Iron Mountain Incorporated
InstitutionGables Capital Management Inc.
Latest Disclosed Ownership19,342 shares
Latest Disclosed Value $ 1,975,592
Gables Capital Management Inc. reports 4.68% decrease in ownership of IRM1 / Iron Mountain Incorporated

On May 1, 2026 - Gables Capital Management Inc. filed a 13F-HR form disclosing ownership of 19,342 shares of Iron Mountain Incorporated (MX:IRM1) valued at $1,975,592 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 20,292 shares of Iron Mountain Incorporated. This represents a change in shares of -4.68% 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)
2026-05-01 2026-03-31 13F IRON MTN INC DEL COM 46284V101 19,342 -950 -4.68 1,976 17.35 0.8371
2026-02-06 2025-12-31 13F IRON MTN INC DEL COM 46284V101 20,292 -500 -2.40 1,683 -20.58 0.7111
2025-11-06 2025-09-30 13F IRON MTN INC DEL COM 46284V101 20,792 -750 -3.48 2,120 -4.07 0.9083
2025-07-30 2025-06-30 13F IRON MTN INC DEL COM 46284V101 21,542 -3,200 -12.93 2,210 3.81 1.0445
2025-05-08 2025-03-31 13F IRON MTN INC DEL COM 46284V101 24,742 100 0.41 2,129 -17.84 1.0523
2025-02-07 2024-12-31 13F IRON MTN INC DEL COM 46284V101 24,642 40 0.16 2,590 -11.39 1.2497
2024-10-25 2024-09-30 13F IRON MTN INC DEL COM 46284V101 24,602 -58 -0.24 2,923 32.26 1.4753
2024-08-08 2024-06-30 13F IRON MTN INC DEL COM 46284V101 24,660 70 0.28 2,210 12.07 1.1556
2024-05-06 2024-03-31 13F IRON MTN INC DEL COM 46284V101 24,590 605 2.52 1,972 17.52 1.0865
2024-02-08 2023-12-31 13F IRON MTN INC DEL COM 46284V101 23,985 -175 -0.72 1,678 16.85 1.0429
2023-11-03 2023-09-30 13F IRON MTN INC DEL COM 46284V101 24,160 -1,000 -3.97 1,436 0.49 0.9995
2023-08-03 2023-06-30 13F IRON MTN INC DEL COM 46284V101 25,160 300 1.21 1,430 8.67 0.9357
2023-05-04 2023-03-31 13F IRON MTN INC DEL COM 46284V101 24,860 0 0.00 1,315 6.13 0.9187
2023-02-06 2022-12-31 13F IRON MTN INC DEL COM 46284V101 24,860 -400 -1.58 1,239 11.52 0.9016
2022-11-01 2022-09-30 13F IRON MTN INC DEL COM 46284V101 25,260 0 0.00 1,111 -9.67 0.8910
2022-07-18 2022-06-30 13F IRON MTN INC COM 46284V101 25,260 0 0.00 1,230 -12.14 0.9287
2022-05-02 2022-03-31 13F IRON MTN INC COM 46284V101 25,260 0 0.00 1,400 5.90 0.8783
2022-02-09 2021-12-31 13F IRON MTN INC COM 46284V101 25,260 0 0.00 1,322 20.40 0.7875
2021-11-12 2021-09-30 13F IRON MTN INC COM 46284V101 25,260 0 0.00 1,098 2.71 0.7166
2021-08-03 2021-06-30 13F IRON MTN INC COM 46284V101 25,260 -14,835 -37.00 1,069 -27.96 0.7321
2021-05-12 2021-03-31 13F IRON MTN INC COM 46284V101 40,095 -100 -0.25 1,484 25.23 0.8129
2021-02-03 2020-12-31 13F IRON MTN INC COM 46284V101 40,195 0 0.00 1,185 10.03 0.6918
2020-11-12 2020-09-30 13F IRON MTN INC COM 46284V101 40,195 -400 -0.99 1,077 1.60 0.6952
2020-07-30 2020-06-30 13F IRON MTN INC COM 46284V101 40,595 -2,300 -5.36 1,060 3.41 0.7344
2020-05-07 2020-03-31 13F IRON MTN INC COM 46284V101 42,895 400 0.94 1,025 -24.58 0.8420
2020-02-10 2019-12-31 13F IRON MTN INC COM 46284V101 42,495 -1,400 -3.19 1,359 -4.50 0.9106
2019-10-30 2019-09-30 13F IRON MTN INC COM 46284V101 43,895 7,020 19.04 1,423 22.88 1.0069
2019-07-31 2019-06-30 13F IRON MTN INC COM 46284V101 36,875 4,800 14.96 1,158 1.85 0.9446
2019-04-30 2019-03-31 13F IRON MTN INC COM 46284V101 32,075 -250 -0.77 1,137 8.49 0.9146
2019-02-08 2018-12-31 13F IRON MTN INC COM 46284V101 32,325 4,200 14.93 1,048 7.93 0.9129
2018-11-05 2018-09-30 13F IRON MTN INC COM 46284V101 28,125 0 0.00 971 0.41 0.7393
2018-08-10 2018-06-30 13F/A-1 IRON MTN INC COM 46284V101 28,125 400 1.44 967 6.15 0.7907
2018-08-03 2018-06-30 13F IRON MTN INC COM 46284V101 24,125 -3,600 827 0.6798
2018-05-17 2018-03-31 13F IRON MTN INC COM 46284V101 27,725 27,725 911 0.8058
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.