Iron Mountain Incorporated
MX ˙ BMV ˙ US46284V1017
SecurityMX:IRM1 / Iron Mountain Incorporated
InstitutionDanske Bank A/s
Latest Disclosed Ownership164,162 shares
Latest Disclosed Value $ 16,767,507
Danske Bank A/s reports 1.05% increase in ownership of IRM1 / Iron Mountain Incorporated

On May 12, 2026 - Danske Bank A/s filed a 13F-HR form disclosing ownership of 164,162 shares of Iron Mountain Incorporated (MX:IRM1) valued at $16,767,507 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 162,462 shares of Iron Mountain Incorporated. This represents a change in shares of 1.05% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-12 2026-03-31 13F Iron Mountain COM 46284V101 164,162 1,700 1.05 16,768 24.42 0.0190
2026-02-02 2025-12-31 13F Iron Mountain COM 46284V101 162,462 13,300 8.92 13,476 -11.37 0.0313
2025-11-19 2025-09-30 13F/A-1 Iron Mountain COM 46284V101 149,162 3,900 2.68 15,206 2.05 0.0378
2025-12-18 2025-06-30 13F Iron Mountain COM 46284V101 145,262 590 0.41 14,900 19.70 0.0370
2025-12-18 2025-03-31 13F Iron Mountain COM 46284V101 144,672 -18,278 -11.22 12,448 -27.33 0.0380
2026-03-18 2024-12-31 13F Iron Mountain COM 46284V101 162,950 24,694 17.86 17,128 4.25 0.0512
2026-03-18 2024-09-30 13F Iron Mountain COM 46284V101 138,256 -800 -0.58 16,429 31.82 0.0547
2026-03-18 2024-06-30 13F Iron Mountain COM 46284V101 139,056 -15,500 -10.03 12,462 0.53 0.0460
2026-03-18 2024-03-31 13F Iron Mountain COM 46284V101 154,556 154,556 12,397 0.0389
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.