Iron Mountain Incorporated
US ˙ NYSE ˙ US46284V1017

SecurityIRM / Iron Mountain Incorporated
InstitutionPacitti Group Inc.
Latest Disclosed Ownership39,233 shares
Latest Disclosed Value $ 4,032,034
Pacitti Group Inc. reports 4.23% increase in ownership of IRM / Iron Mountain Incorporated

On May 6, 2026 - Pacitti Group Inc. filed a 13F-HR form disclosing ownership of 39,233 shares of Iron Mountain Incorporated (US:IRM) valued at $4,007,259 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 37,639 shares of Iron Mountain Incorporated. This represents a change in shares of 4.23% during the quarter. The current value of the position is $5,019,862 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)
2026-05-06 2026-03-31 13F IRON MTN INC DEL COM 46284V101 39,233 1,594 4.23 4,032 28.16 1.4573
2026-02-05 2025-12-31 13F IRON MTN INC DEL COM 46284V101 37,639 893 2.43 3,147 -16.49 1.1582
2025-11-14 2025-09-30 13F IRON MTN INC DEL COM 46284V101 36,746 1,499 4.25 3,768 3.60 1.4583
2025-07-31 2025-06-30 13F IRON MTN INC DEL COM 46284V101 35,247 1,048 3.06 3,636 22.75 1.5770
2025-05-09 2025-03-31 13F IRON MTN INC DEL COM 46284V101 34,199 1,136 3.44 2,963 -15.20 1.4050
2025-02-07 2024-12-31 13F IRON MTN INC DEL COM 46284V101 33,063 -420 -1.25 3,493 -12.61 1.6501
2024-11-12 2024-09-30 13F IRON MTN INC DEL COM 46284V101 33,483 -457 -1.35 3,997 30.71 1.8851
2024-08-13 2024-06-30 13F IRON MTN INC DEL COM 46284V101 33,940 -323 -0.94 3,059 10.60 1.6000
2024-05-13 2024-03-31 13F IRON MTN INC DEL COM 46284V101 34,263 207 0.61 2,766 15.16 1.4945
2024-02-14 2023-12-31 13F IRON MTN INC DEL COM 46284V101 34,056 598 1.79 2,401 19.63 1.4967
2023-11-13 2023-09-30 13F IRON MTN INC DEL COM 46284V101 33,458 -742 -2.17 2,007 2.40 1.4045
2023-08-11 2023-06-30 13F IRON MTN INC DEL COM 46284V101 34,200 -341 -0.99 1,961 7.28 1.3808
2023-05-12 2023-03-31 13F IRON MTN INC DEL COM 46284V101 34,541 1,299 3.91 1,828 10.26 1.3382
2023-02-10 2022-12-31 13F IRON MTN INC DEL COM 46284V101 33,242 84 0.25 1,657 13.65 1.2969
2022-11-10 2022-09-30 13F IRON MTN INC DEL COM 46284V101 33,158 -14,659 -30.66 1,458 -37.37 1.1933
2022-08-10 2022-06-30 13F IRON MTN INC COM 46284V101 47,817 1,776 3.86 2,328 -8.74 1.7862
2022-05-12 2022-03-31 13F IRON MTN INC COM 46284V101 46,041 2,723 6.29 2,551 12.53 1.6853
2022-02-08 2021-12-31 13F IRON MTN INC COM 46284V101 43,318 455 1.06 2,267 21.75 1.4740
2021-11-15 2021-09-30 13F IRON MTN INC COM 46284V101 42,863 6,971 19.42 1,862 22.66 1.1628
2021-08-16 2021-06-30 13F IRON MOUNTAIN INC COM USD0.01 COM USD0.01 46284V101 35,892 1,401 4.06 1,518 18.97 0.9131
2021-05-17 2021-03-31 13F IRON MOUNTAIN INC COM USD0.01 COM USD0.01 46284V101 34,491 11,538 50.27 1,276 88.76 0.8431
2021-02-16 2020-12-31 13F IRON MOUNTAIN INC COM USD0.01 COM USD0.01 46284V101 22,953 555 2.48 676 12.67 0.4866
2020-11-16 2020-09-30 13F IRON MOUNTAIN INC COM COM 46284V101 22,398 2,103 10.36 600 -0.50 0.4822
2020-08-12 2020-06-30 13F IRON MOUNTAIN INC COM COM 46284V101 20,295 -1,941 -8.73 603 13.99 0.4729
2020-05-12 2020-03-31 13F IRON MOUNTAIN INC COM COM 46284V101 22,236 4,100 22.61 529 -8.48 0.5233
2020-02-13 2019-12-31 13F IRON MOUNTAIN INC COM COM 46284V101 18,136 3,025 20.02 578 18.20 0.4687
2019-11-18 2019-09-30 13F IRON MOUNTAIN INC COM COM 46284V101 15,111 15,111 489 0.5239
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.