Mirion Technologies MIR Insider Ownership

NYSE MIR

$15.23 +0.30 (+2.04%)

As of: Oct 20, 2026 · 3:59 PM EDT

Insider Holdings by Owner

41.07Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

4.70%

▲+0.0091% pp QoQ

Shares Held by Insiders

11.71Mn

filed for Sep 2026

▲+0.19% QoQ

Shares Outstanding

249.03Mn

249,026,377 shares

Direct Holdings

5.54Mn

Indirect: 6.17Mn

Net Shares Traded (QoQ)

+22.67K

net buying in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 10, 2026

Over the past year, MIR insiders bought $312,000 of stock (20K shares) and sold $20.3 million (815.9K shares) on the open market.

Counted by insider, open-market buying of MIR stock in the past 12 months came from one insider and selling from 5 insiders.
Among MIR's insiders, Brian Schopfer (Chief Financial Officer) was the top open-market buyer in the past 12 months, with $312,000 of stock purchased (20K shares) and the latest purchase on September 2, 2026.
Conversely, Lawrence D. Kingsley (Director) was MIR's largest open-market seller in the past 12 months, with $15.8 million of sales (650K shares); the latest was on December 10, 2025.
Outside the open market, Mirion Technologies insiders received 527.96K shares in stock awards, gave up 285.48K shares to cover taxes or exercise prices and gave away 3.58Mn shares as gifts over the past 12 months.
Per Business Quant data, Mirion Technologies insiders hold 11.71Mn shares in total based on their latest Form 4 filings, or 4.70% of the 249.03Mn shares outstanding; that total is up 0.19% from 11.68Mn shares at the end of Q2 2026.
Direct holdings account for 5.54Mn shares (47.29%) of MIR's insider total, and indirect holdings through trusts, partnerships and family members for 6.17Mn shares (52.71%).
Holdings in Mirion Technologies stock are reported by 13 insiders, the officers, directors and 10% owners who have filed a Form 4 in the past two years.
Mirion Technologies' top three insider holders by shares held are Thomas D. Logan (Chief Executive Officer, 4.8Mn shares), Lawrence D. Kingsley (Director, 3.64Mn shares) and Brian Schopfer (Chief Financial Officer, 2.2Mn shares).
Thomas D. Logan alone accounts for 40.99% of the shares held by Mirion Technologies insiders.
In the last 12 months, 41 Form 4 filings with transactions in MIR stock came from 13 insiders.
The insider data for MIR reflects Form 4 filings through September 30, 2026.

Form 4 Holdings

Insiders Holding MIR

Insiders 16

Shares held 41.07Mn

Of outstanding 16.49%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Sponsor Ii Llc Gs	TenPercentOwner	17,793,000	0	17,793,000	43.3%	06 Jun, 2024
2	General Partners (Ix) Ltd Charterhouse	Other	0	14,960,702	14,960,702	36.4%	08 Mar, 2023
3	Thomas D Logan	Chief Executive Officer	2,201,313	2,551,371	4,752,684	11.6%	07 May, 2026
4	Brian Schopfer	Chief Financial Officer	2,199,971	0	2,199,971	5.4%	02 Sep, 2026
5	Loic Eloy	Nuclear Safety President	316,424	0	316,424	0.8%	03 Mar, 2026
6	Michael J Rossi	Medical Group President	196,618	0	196,618	0.5%	03 Nov, 2023
7	Steven W. Etzel	Director	116,838	0	116,838	0.3%	14 May, 2026
8	Emmanuelle Lee	Chief Legal Officer	82,431	32,748	115,179	0.3%	02 Apr, 2026
9	Jody Markopoulos	Director	111,157	0	111,157	0.3%	30 Sep, 2026
10	John W Kuo	Director	109,509	0	109,509	0.3%	14 May, 2026
11	Kenneth Bockhorst	Director	105,573	0	105,573	0.3%	14 May, 2026
12	Lawrence D Kingsley	Director	93,949	0	93,949	0.2%	30 Sep, 2026
13	Robert Cascella	Director	80,892	0	80,892	0.2%	14 May, 2026
14	Sheila Rege	Director	59,044	0	59,044	0.1%	14 May, 2026
15	Alison Ulrich	Chief Human Resources Officer	36,235	0	36,235	0.1%	02 Apr, 2026
16	Christopher A. Moore	Chief Accounting Officer (Pao)	22,157	0	22,157	0.1%	08 May, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

290 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
30 Sep, 2026	Lawrence D Kingsley	Director	Acquired A	1,333	$14.34	$19.12K	73,858	Direct
30 Sep, 2026	Jody Markopoulos	Director	Acquired A	1,333	$14.34	$19.12K	82,842	Direct
02 Sep, 2026	Brian Schopfer	Chief Financial Officer	Acquired P	20,000	$15.60	$312.00K	933,290	Direct
30 Jun, 2026	Lawrence D Kingsley	Director	Acquired A	1,095	$17.46	$19.12K	72,525	Direct
13 May, 2026	Steven W. Etzel	Director	Acquired A	7,383	$0.00	$0	87,448	Direct
13 May, 2026	Lawrence D Kingsley	Director	Acquired A	7,383	$0.00	$0	71,430	Direct
13 May, 2026	John W Kuo	Director	Acquired A	7,383	$0.00	$0	80,119	Direct
13 May, 2026	Jody Markopoulos	Director	Acquired A	7,383	$0.00	$0	81,509	Direct
13 May, 2026	Kenneth Bockhorst	Director	Acquired A	7,383	$0.00	$0	77,258	Direct
13 May, 2026	Sheila Rege	Director	Acquired A	7,383	$0.00	$0	49,877	Direct
13 May, 2026	Robert Cascella	Director	Acquired A	7,383	$0.00	$0	60,801	Direct
07 May, 2026	Christopher A. Moore	Chief Accounting Officer (Pao)	Disposed S	8,400	$19.64	$164.98K	22,157	Direct
06 May, 2026	Thomas D Logan	Chief Executive Officer	Disposed G	311,851	$0.00	$0	52,209	Direct
01 Apr, 2026	Thomas D Logan	Chief Executive Officer	Disposed F	22,614	$18.59	$420.39K	364,060	Direct
01 Apr, 2026	Alison Ulrich	Chief Human Resources Officer	Disposed F	2,053	$18.59	$38.17K	36,235	Direct
01 Apr, 2026	Emmanuelle Lee	Chief Legal Officer	Disposed F	4,680	$18.59	$87.00K	82,431	Direct
01 Apr, 2026	Brian Schopfer	Chief Financial Officer	Disposed F	7,377	$18.59	$137.14K	913,290	Direct
01 Apr, 2026	Christopher A. Moore	Chief Accounting Officer (Pao)	Disposed F	1,903	$18.59	$35.38K	30,557	Direct
31 Mar, 2026	Lawrence D Kingsley	Director	Acquired A	1,104	$17.32	$19.12K	64,047	Direct
01 Mar, 2026	Thomas D Logan	Chief Executive Officer	Disposed F	20,650	$21.61	$446.25K	3,289,038	Direct

Showing 1 to 20 of 290 transactions