Mirion Technologies, Inc.
DE ˙ DB
15,28 € ↑0,78 (5,38%)
2026-06-01
DEL PRIS
SecurityDE:55I0 / Mirion Technologies, Inc.
InstitutionOppenheimer & Co Inc
Latest Disclosed Ownership41,615 shares
Latest Disclosed Value $ 773,623
Oppenheimer & Co Inc reports 22.47% increase in ownership of 55I0 / Mirion Technologies, Inc.

On April 23, 2026 - Oppenheimer & Co Inc filed a 13F-HR form disclosing ownership of 41,615 shares of Mirion Technologies, Inc. (DE:55I0) valued at $615,902 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 33,981 shares of Mirion Technologies, Inc.. This represents a change in shares of 22.47% during the quarter. The current value of the position is $636,085 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)
2026-04-23 2026-03-31 13F MIRION TECHNOLOGIES COM CL A 60471A101 41,615 7,634 22.47 774 -2.77 0.0094
2026-02-02 2025-12-31 13F MIRION TECHNOLOGIES COM CL A 60471A101 33,981 1,919 5.99 796 6.71 0.0113
2025-11-06 2025-09-30 13F MIRION TECHNOLOGIES COM CL A 60471A101 32,062 550 1.75 746 9.88 0.0091
2025-07-31 2025-06-30 13F MIRION TECHNOLOGIES COM CL A 60471A101 31,512 -1,803 -5.41 678 40.37 0.0090
2025-04-23 2025-03-31 13F MIRION TECHNOLOGIES COM CL A 60471A101 33,315 -1,848 -5.26 483 -21.21 0.0073
2025-02-05 2024-12-31 13F MIRION TECHNOLOGIES COM CL A 60471A101 35,163 -23,097 -39.64 614 -4.81 0.0092
2024-11-05 2024-09-30 13F MIRION TECHNOLOGIES COM CL A 60471A101 58,260 2,595 4.66 645 7.87 0.0098
2024-08-08 2024-06-30 13F MIRION TECHNOLOGIES COM CL A 60471A101 55,665 55,665 598 0.0095
2024-02-13 2023-12-31 13F MIRION TECHNOLOGIES COM CL A 60471A101 0 -13,900 -100.00 0 -100.00
2023-11-08 2023-09-30 13F MIRION TECHNOLOGIES COM CL A 60471A101 13,900 0 0.00 104 -11.97 0.0021
2023-08-03 2023-06-30 13F MIRION TECHNOLOGIES COM CL A 60471A101 13,900 13,900 117 0.0023
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.