Iron Mountain Incorporated
DE ˙ DB ˙ US46284V1017
111,85 € ↑2,30 (2,10%)
2026-06-05
DEL PRIS
SecurityDE:I5M / Iron Mountain Incorporated
InstitutionTectonic Advisors Llc
Latest Disclosed Ownership165,814 shares
Latest Disclosed Value $ 16,936,333
Tectonic Advisors Llc reports 1.87% increase in ownership of I5M / Iron Mountain Incorporated

On April 17, 2026 - Tectonic Advisors Llc filed a 13F-HR form disclosing ownership of 165,814 shares of Iron Mountain Incorporated (DE:I5M) valued at $14,720,967 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 162,777 shares of Iron Mountain Incorporated. This represents a change in shares of 1.87% during the quarter. The current value of the position is $18,546,296 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)
2026-04-17 2026-03-31 13F IRON MTN INC DEL COM 46284V101 165,814 3,037 1.87 16,936 25.43 0.6652
2026-01-23 2025-12-31 13F IRON MTN INC DEL COM 46284V101 162,777 14,402 9.71 13,502 -10.73 0.5341
2025-10-21 2025-09-30 13F IRON MTN INC DEL COM 46284V101 148,375 19,999 15.58 15,125 14.87 0.8261
2025-07-23 2025-06-30 13F IRON MTN INC DEL COM 46284V101 128,376 12,379 10.67 13,168 31.93 0.7655
2025-05-02 2025-03-31 13F IRON MTN INC DEL COM 46284V101 115,997 15,790 15.76 9,980 -5.24 0.6239
2025-01-27 2024-12-31 13F IRON MTN INC DEL COM 46284V101 100,207 4,303 4.49 10,533 -7.58 0.6857
2024-10-23 2024-09-30 13F IRON MTN INC DEL COM 46284V101 95,904 2,242 2.39 11,396 35.78 0.7443
2024-08-02 2024-06-30 13F IRON MTN INC DEL COM 46284V101 93,662 5,551 6.30 8,394 18.76 0.6048
2024-05-07 2024-03-31 13F IRON MTN INC DEL COM 46284V101 88,111 1,710 1.98 7,067 16.89 0.5390
2024-01-17 2023-12-31 13F IRON MTN INC DEL COM 46284V101 86,401 4,138 5.03 6,046 23.64 0.5061
2023-10-24 2023-09-30 13F IRON MTN INC DEL COM 46284V101 82,263 4,380 5.62 4,891 10.51 0.4584
2023-07-14 2023-06-30 13F IRON MTN INC DEL COM 46284V101 77,883 6,677 9.38 4,425 17.47 0.5449
2023-04-26 2023-03-31 13F IRON MTN INC DEL COM 46284V101 71,206 13,933 24.33 3,768 31.94 0.5153
2023-02-14 2022-12-31 13F IRON MTN INC DEL COM 46284V101 57,273 11,650 25.54 2,855 42.32 0.4426
2022-11-08 2022-09-30 13F IRON MTN INC DEL COM 46284V101 45,623 9,263 25.48 2,006 13.27 0.3701
2022-08-11 2022-06-30 13F IRON MTN INC COM 46284V101 36,360 7,123 24.36 1,771 9.32 0.3235
2022-05-09 2022-03-31 13F IRON MTN INC COM 46284V101 29,237 4,872 20.00 1,620 27.06 0.2788
2022-02-02 2021-12-31 13F IRON MTN INC COM 46284V101 24,365 7,543 44.84 1,275 74.66 0.2283
2021-11-02 2021-09-30 13F IRON MTN INC COM 46284V101 16,822 7,930 89.18 730 94.15 0.1433
2021-07-22 2021-06-30 13F IRON MTN INC COM 46284V101 8,892 863 10.75 376 26.17 0.0775
2021-05-18 2021-03-31 13F IRON MTN INC COM 46284V101 8,029 8,029 298 0.0740
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.