Iron Mountain Incorporated
DE ˙ DB ˙ US46284V1017
111,85 € ↑2,30 (2,10%)
2026-06-05
DEL PRIS
SecurityDE:I5M / Iron Mountain Incorporated
InstitutionCrescent Grove Advisors, LLC
Latest Disclosed Ownership16,054 shares
Latest Disclosed Value $ 1,705,229
Crescent Grove Advisors, LLC reports 21.12% increase in ownership of I5M / Iron Mountain Incorporated

On May 6, 2026 - Crescent Grove Advisors, LLC filed a 13F-HR form disclosing ownership of 16,054 shares of Iron Mountain Incorporated (DE:I5M) valued at $1,425,274 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 13,255 shares of Iron Mountain Incorporated. This represents a change in shares of 21.12% during the quarter. The current value of the position is $1,795,640 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 New Com COMM 46284V101 16,054 2,799 21.12 1,705 53.60 0.1641
2026-02-10 2025-12-31 13F Iron MTN Inc New Com COMM 46284V101 13,255 0 0.00 1,111 -18.44 0.1031
2025-11-13 2025-09-30 13F Iron MTN Inc New Com COMM 46284V101 13,255 0 0.00 1,362 -0.58 0.1292
2025-08-13 2025-06-30 13F Iron MTN Inc New Com COMM 46284V101 13,255 201 1.54 1,370 20.83 0.1328
2025-04-24 2025-03-31 13F Iron MTN Inc New Com COMM 46284V101 13,054 0 0.00 1,133 -17.96 0.1181
2025-01-21 2024-12-31 13F Iron MTN Inc New Com COMM 46284V101 13,054 211 1.64 1,381 -10.03 0.1369
2024-10-30 2024-09-30 13F Iron MTN Inc New Com COMM 46284V101 12,843 571 4.65 1,535 38.66 0.1566
2024-07-22 2024-06-30 13F Iron MTN Inc New Com COMM 46284V101 12,272 0 0.00 1,108 11.59 0.1214
2024-04-29 2024-03-31 13F Iron MTN Inc New Com COMM 46284V101 12,272 1,737 16.49 992 34.60 0.1035
2024-01-30 2023-12-31 13F Iron MTN Inc New Com COMM 46284V101 10,535 10,535 737 0.0822
2022-11-08 2022-09-30 13F Iron MTN Inc New Com COMM 46284V101 0 -5,975 -100.00 0 -100.00
2022-07-20 2022-06-30 13F Iron MTN Inc New Com COMM 46284V101 5,975 5,975 291 0.0306
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.