Mirion Technologies, Inc.
MX ˙ BMV
SecurityMX:MIR / Mirion Technologies, Inc.
InstitutionPathstone Holdings, LLC
Latest Disclosed Ownership132,132 shares
Latest Disclosed Value $ 2,456,328
Pathstone Holdings, LLC reports 15.44% decrease in ownership of MIR / Mirion Technologies, Inc.

On May 11, 2026 - Pathstone Holdings, LLC filed a 13F-HR form disclosing ownership of 132,132 shares of Mirion Technologies, Inc. (MX:MIR) valued at $2,456,328 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 156,267 shares of Mirion Technologies, Inc.. This represents a change in shares of -15.44% 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.

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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)
2026-05-11 2026-03-31 13F MIRION TECHNOLOGIES COM CL A 60471A101 132,132 -24,135 -15.44 2,456 -32.88 0.0053
2026-02-13 2025-12-31 13F MIRION TECHNOLOGIES COM CL A 60471A101 156,267 7,646 5.14 3,660 5.87 0.0141
2025-11-13 2025-09-30 13F MIRION TECHNOLOGIES COM CL A 60471A101 148,621 10,021 7.23 3,457 15.82 0.0132
2025-08-12 2025-06-30 13F MIRION TECHNOLOGIES COM CL A 60471A101 138,600 38,919 39.04 2,984 106.51 0.0118
2025-05-15 2025-03-31 13F MIRION TECHNOLOGIES COM CL A 60471A101 99,681 61,443 160.69 1,445 116.64 0.0063
2025-02-14 2024-12-31 13F MIRION TECHNOLOGIES COM CL A 60471A101 38,238 11,377 42.36 667 124.58 0.0029
2024-11-07 2024-09-30 13F MIRION TECHNOLOGIES COM CL A 60471A101 26,861 4,060 17.81 297 21.72 0.0013
2024-08-14 2024-06-30 13F MIRION TECHNOLOGIES COM CL A 60471A101 22,801 22,801 245 0.0011
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.