Comparable stake leader
BlackRock, Inc.
SEC ownership of Mirion Technologies, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001809987.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
13 May 2026
- Public ticker
- MIR on NYSE
- Parsed ownership sources
- 13D/G, 13F, and 3/4/5
- Largest SEC-reported holder
- BlackRock, Inc.
- Latest 13D/G holder
- BlackRock, Inc.
- Latest parsed ownership date
- 13 May 2026
- Issuer CIK
- 0001809987
- Issuer location
- Atlanta, GA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Mirion Technologies, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
13 May 2026
13D/G
13F
3/4/5
Lead comparable stake: 15%
13D/G row: BlackRock, Inc.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 15%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BlackRock, Inc.'s linked filing trail.
Comparable ownership
Top 5
BlackRock, Inc.
15%
VANGUARD PORTFOLIO MANAGEMENT LLC
7.4%
T. Rowe Price Investment Manageme...
6.1%
VANGUARD CAPITAL MANAGEMENT LLC
5%
KUWAIT INVESTMENT AUTHORITY ON BE...
4.1%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13D/G
13F
Company
|
15%
|
$786,972,923
35,690,382 shares
|
$0 | 30 Sep 2025 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13D/G
13F
Vanguard Portfolio Management · Company
|
7.4%
|
$336,832,173
18,118,998 shares
|
$0 | 31 Mar 2026 |
| T. Rowe Price Investment Management, Inc. |
13D/G
13F
Company
|
6.1%
|
$353,943,064
15,112,855 shares
|
$0 | 31 Dec 2025 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
5%
|
$229,161,718
12,327,150 shares
|
$0 | 31 Mar 2026 |
| KUWAIT INVESTMENT AUTHORITY ON BEHALF OF THE GOVT OF KUWAIT |
13D/G
Kuwait Investment Authority, acting for and on behalf of the Government of the State of Kuwait (KIA)
|
4.1%
|
$238,218,661
10,171,591 shares
|
$0 | 29 Jul 2022 |
| GSAM Holdings LLC |
13D/G
GOLDMAN SACHS GROUP INC
|
2.3%
|
$77,448,166
5,187,419 shares
|
$0 | 17 Dec 2024 |
| Lawrence D. Kingsley |
3/4/5
Director
|
1.5%
|
$66,561,587
3,580,505 shares
|
-$15,803,200 | 13 May 2026 |
| Loic Eloy |
3/4/5
Nuclear & Safety President
|
0.05%
|
$2,434,693
113,347 shares
|
-$1,697,821 | 02 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$33,089,842.
Buys
$0
Insiders: 0
Sells
$33,089,842
Insiders: 6
Net
-$33,089,842
Shares: -1,413,066
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 1,413,066
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 8,400 | $0 | $164,976 | -$164,976 |
| 3-6 | 0 | 350,000 | $0 | $8,654,800 | -$8,654,800 |
| 6-9 | 0 | 457,500 | $0 | $11,482,146 | -$11,482,146 |
| 9-12 | 0 | 597,166 | $0 | $12,787,921 | -$12,787,921 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 21 reporting-owner rows connected to Mirion Technologies, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
21
Largest Forms 3/4/5 holder
GS Sponsor II LLC
Net 12M change
-$33,089,843
Latest report
13 May 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| GS Sponsor II LLC | 10%+ Owner | $222,825,480 | Mixed | 04 Jun 2024 | ||
| Charterhouse General Partners (IX) Ltd | Former 10% Owner | $156,339,336 | Mixed | 07 Mar 2023 | ||
| Lawrence D. Kingsley | Director | $66,561,587 | -$15,803,200 | -19% | Median | 13 May 2026 |
| Thomas D. Logan | Chief Executive Officer, Director | $66,355,852 | -$10,740,783 | -14% | Median | 06 May 2026 |
| Brian Schopfer | Chief Financial Officer | $21,389,251 | -$4,340,420 | -17% | Mixed | 01 Apr 2026 |
| Loic Eloy | Nuclear & Safety President | $2,434,693 | -$1,697,821 | -41% | Mixed | 02 Mar 2026 |
| John W. Kuo | Director | $2,195,359 | Mixed | 13 May 2026 | ||
| Emmanuelle Lee | Chief Legal Officer | $1,930,534 | -$342,643 | -15% | Mixed | 01 Apr 2026 |
| Steven W. Etzel | Director | $1,625,658 | Median | 13 May 2026 | ||
| Jody Markopoulos | Director | $1,515,252 | Median | 13 May 2026 | ||
| Kenneth Bockhorst | Director | $1,436,226 | Median | 13 May 2026 | ||
| Michael J. Rossi | Medical Group President | $1,214,008 | Mixed | 01 Nov 2023 | ||
| Robert Cascella | Director | $1,130,290 | Median | 13 May 2026 | ||
| Sheila Rege | Director | $927,213 | Median | 13 May 2026 | ||
| Alison Ulrich | Chief Human Resources Officer | $848,623 | Mixed | 01 Apr 2026 | ||
| Jo Natauri | Director | $522,500 | Mixed | 20 Jun 2023 | ||
| Christopher A. Moore | Chief Accounting Officer (PAO) | $435,163 | -$164,976 | -27% | Filing P/S | 07 May 2026 |
| Christopher L. Warren | Former Director | Mixed | 16 Sep 2022 | |||
| Michael Freed | Chief Operating Officer | Mixed | 20 Oct 2021 | |||
| GSAM Holdings LLC | Director, 10%+ Owner | Mixed | 08 Dec 2022 |
Recent insider transactions for Mirion Technologies, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Lawrence D. Kingsley | MIR | Class A Common Stock | Award | 11.5% | 7,383 | 71,430 | 13 May 2026 | Direct | ||
| Kenneth Bockhorst | MIR | Class A Common Stock | Award | 10.6% | 7,383 | 77,258 | 13 May 2026 | Direct | ||
| Robert Cascella | MIR | Class A Common Stock | Award | 13.8% | 7,383 | 60,801 | 13 May 2026 | Direct | ||
| Steven W. Etzel | MIR | Class A Common Stock | Award | 9.22% | 7,383 | 87,448 | 13 May 2026 | Direct | ||
| John W. Kuo | MIR | Class A Common Stock | Award | 10.2% | 7,383 | 80,119 | 13 May 2026 | Direct | ||
| Jody Markopoulos | MIR | Class A Common Stock | Award | 9.96% | 7,383 | 81,509 | 13 May 2026 | Direct | ||
| Sheila Rege | MIR | Class A Common Stock | Award | 17.4% | 7,383 | 49,877 | 13 May 2026 | Direct | ||
| Christopher A. Moore | MIR | Class A Common Stock | Sale | -27.5% | $164,976 | $19.64 | -8,400 | 22,157 | 07 May 2026 | Direct |
| Thomas D. Logan | MIR | Class A Common Stock | Gift | -85.7% | -311,851 | 52,209 | 06 May 2026 | Direct | ||
| Alison Ulrich | MIR | Class A Common Stock | Tax liability | -5.36% | -2,053 | 36,235 | 01 Apr 2026 | Direct | ||
| Brian Schopfer | MIR | Class A Common Stock | Tax liability | -0.8% | -7,377 | 913,290 | 01 Apr 2026 | Direct | ||
| Christopher A. Moore | MIR | Class A Common Stock | Tax liability | -5.86% | -1,903 | 30,557 | 01 Apr 2026 | Direct | ||
| Thomas D. Logan | MIR | Class A Common Stock | Tax liability | -5.85% | -22,614 | 364,060 | 01 Apr 2026 | Direct | ||
| Emmanuelle Lee | MIR | Class A Common Stock | Tax liability | -5.37% | -4,680 | 82,431 | 01 Apr 2026 | Direct | ||
| Lawrence D. Kingsley | MIR | Class A Common Stock | Award | 1.75% | 1,104 | 64,047 | 31 Mar 2026 | Direct | ||
| Loic Eloy | MIR | Class A Common Stock | Award | 15.9% | 15,577 | 113,347 | 02 Mar 2026 | Direct | ||
| Brian Schopfer | MIR | Class A Common Stock | Tax liability | -3% | -28,499 | 920,667 | 02 Mar 2026 | Direct | ||
| Brian Schopfer | MIR | Class A Common Stock | Award | 7.34% | 64,906 | 949,166 | 02 Mar 2026 | Direct | ||
| Thomas D. Logan | MIR | Class A Common Stock | Gift | -88.9% | -3,093,812 | 386,674 | 02 Mar 2026 | Direct | ||
| Thomas D. Logan | MIR | Class A Common Stock | Tax liability | -3.53% | -127,184 | 3,480,486 | 02 Mar 2026 | Direct | ||
| Thomas D. Logan | MIR | Class A Common Stock | Award | 9.69% | 318,632 | 3,607,670 | 02 Mar 2026 | Direct | ||
| Brian Schopfer | MIR | Class A Common Stock | Tax liability | -1.03% | -9,172 | 884,260 | 01 Mar 2026 | Direct | ||
| Alison Ulrich | MIR | Class A Common Stock | Tax liability | -5.81% | -2,360 | 38,288 | 01 Mar 2026 | Direct | ||
| Alison Ulrich | MIR | Class A Common Stock | Award | 15.8% | 5,552 | 40,648 | 01 Mar 2026 | Direct | ||
| Christopher A. Moore | MIR | Class A Common Stock | Tax liability | -4.13% | -1,397 | 32,460 | 01 Mar 2026 | Direct | ||
| Christopher A. Moore | MIR | Class A Common Stock | Award | 19.6% | 5,552 | 33,857 | 01 Mar 2026 | Direct | ||
| Emmanuelle Lee | MIR | Class A Common Stock | Tax liability | -3.53% | -3,184 | 87,111 | 01 Mar 2026 | Direct | ||
| Emmanuelle Lee | MIR | Class A Common Stock | Award | 14.7% | 11,568 | 90,295 | 01 Mar 2026 | Direct | ||
| Thomas D. Logan | MIR | Class A Common Stock | Tax liability | -0.62% | -20,650 | 3,289,038 | 01 Mar 2026 | Direct | ||
| Lawrence D. Kingsley | MIR | Class A Common Stock | Award | 1.3% | 806 | 62,943 | 31 Dec 2025 | Direct | ||
| Thomas D. Logan | MIR | Class A Common Stock | Tax liability | -1.19% | -39,863 | 3,309,688 | 27 Dec 2025 | Direct | ||
| Brian Schopfer | MIR | Class A Common Stock | Tax liability | -0.94% | -8,500 | 893,432 | 27 Dec 2025 | Direct | ||
| Emmanuelle Lee | MIR | Class A Common Stock | Tax liability | -6.99% | -5,913 | 78,727 | 27 Dec 2025 | Direct | ||
| Alison Ulrich | MIR | Class A Common Stock | Tax liability | -0.38% | -134 | 35,096 | 27 Dec 2025 | Direct | ||
| John W. Kuo | MIR | Class A Common Stock | Gift | -6.26% | -4,860 | 72,736 | 11 Dec 2025 | Direct | ||
| Lawrence D. Kingsley | MIR | Class A Common Stock | Sale | -9.07% | $8,654,800 | $24.73 | -350,000 | 3,509,075 | 10 Dec 2025 | By Lawrence D. Kingsley Revocable Trust |
| Kenneth Bockhorst | MIR | Class A Common Stock | Gift | -12.2% | -9,680 | 69,875 | 08 Dec 2025 | Direct | ||
| Brian Schopfer | MIR | Class A Common Stock | Gift | -0.01% | -100 | 901,932 | 08 Dec 2025 | Direct | ||
| Brian Schopfer | MIR | Class A Common Stock | Gift | -0.27% | -2,400 | 902,032 | 05 Dec 2025 | Direct | ||
| Lawrence D. Kingsley | MIR | Class A Common Stock | Gift | -1.05% | -40,925 | 3,859,075 | 24 Nov 2025 | By Lawrence D. Kingsley Revocable Trust | ||
| Lawrence D. Kingsley | MIR | Class A Common Stock | Sale | -7.14% | $7,148,400 | $23.83 | -300,000 | 3,900,000 | 21 Nov 2025 | By Lawrence D. Kingsley Revocable Trust |
| Loic Eloy | MIR | Class A Common Stock | Sale | -31.5% | $1,225,683 | $27.24 | -45,000 | 97,770 | 11 Nov 2025 | Direct |
| Emmanuelle Lee | MIR | Class A Common Stock | Sale | -12.9% | $342,642 | $27.41 | -12,500 | 84,640 | 10 Nov 2025 | Direct |
| Brian Schopfer | MIR | Class A Common Stock | Sale | -9.96% | $2,765,420 | $27.65 | -100,000 | 904,432 | 06 Nov 2025 | Direct |
| Brian Schopfer | MIR | Class B Common Stock | Disposed to Issuer | -20% | -100,000 | 399,935 | 06 Nov 2025 | Direct | ||
| Brian Schopfer | MIR | Class A Common Stock | Award | 11.1% | 100,000 | 1,004,432 | 06 Nov 2025 | Direct | ||
| Brian Schopfer | MIR | Class A Common Stock | Gift | -1.63% | -15,000 | 904,432 | 30 Oct 2025 | Direct | ||
| Thomas D. Logan | MIR | Class A Common Stock | Gift | -3.07% | -106,188 | 3,349,551 | 30 Oct 2025 | Direct | ||
| Lawrence D. Kingsley | MIR | Class A Common Stock | Award | 1.39% | 850 | 62,137 | 30 Sep 2025 | Direct | ||
| Thomas D. Logan | MIR | Class A Common Stock | Sale | -4.68% | $3,813,635 | $21.79 | -175,000 | 3,567,305 | 12 Aug 2025 | Direct |
* marks a reported price that did not pass the local price check.