Mirion Ownership | Who Owns Mirion?

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Mirion Ownership Summary

Mirion is owned by 92.32% institutional investors, 4.18% insiders, and 3.51% retail investors. Vanguard group is the largest institutional shareholder, holding 11.57% of MIR shares. Vanguard US Total Market Shares ETF is the top mutual fund, with 2.74% of its assets in Mirion shares.

MIR Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Mirion	92.32%	4.18%	3.51%
Sector	Industrials Stocks	64.07%	12.69%	23.24%
Industry	Industrial Machinery Stocks	74.87%	9.25%	15.88%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	23.91M	11.57%	$417.23M
T. rowe price investment management	20.96M	9.30%	$451.22M
Blackrock	15.80M	7.91%	$169.72M
Blackrock funding, inc. /de	17.01M	7.55%	$366.28M
Goldman sachs group	8.88M	4.29%	$154.88M
Janus henderson group	8.33M	4.03%	$145.37M
Dimensional fund advisors lp	7.19M	3.48%	$125.39M
Cooperman leon g	7.13M	3.16%	$153.40M
State street	5.23M	2.62%	$56.14M
Brown advisory	5.40M	2.40%	$116.27M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Corsair capital management	3.03M	12.48%	$65.14M
Cooperman leon g	7.13M	5.39%	$153.40M
Bornite capital management lp	2.05M	4.42%	$44.17M
Candelo capital management lp	203.16K	3.96%	$4.37M
Ack asset management	1.34M	3.78%	$28.79M
Troluce capital advisors	600.00K	3.06%	$12.92M
Pier capital	871.03K	2.86%	$18.75M
Chescapmanager	1.33M	2.49%	$23.17M
Roubaix capital	166.35K	1.72%	$3.58M
Maverick capital	5.31M	1.72%	$114.28M

Top Buyers

Holder	Shares	% Assets	Change
Massachusetts financial services co /ma/	3.83M	0.03%	3.83M
Driehaus capital management	2.01M	0.35%	2.01M
Loomis sayles & co l p	1.59M	0.04%	1.59M
Millennium management	3.11M	0.03%	1.56M
Hood river capital management	1.47M	0.44%	1.47M

Top Sellers

Holder	Shares	% Assets	Change
Goldman sachs group	8.88M	0.02%	-25.93M
P2 capital partners	-	-	-3.35M
Maverick capital	5.31M	1.72%	-2.75M
Swedbank ab	4.13M	0.10%	-1.26M
Masters capital management	-	-	-1.00M

New Positions

Holder	Shares	% Assets	Change	Value
Massachusetts financial services co /ma/	3.83M	0.03%	3.83M	$82.54M
Driehaus capital management	2.01M	0.35%	2.01M	$43.23M
Loomis sayles & co l p	1.59M	0.04%	1.59M	$34.27M
Hood river capital management	1.47M	0.44%	1.47M	$31.65M
Groupama asset managment	800.00K	0.02%	800.00K	$932.39K

Sold Out

Holder	Change
Claris advisors, llc / mo /	-12.00
Anfield capital management	-45.00
Neo ivy capital management	-63.00
Stephens consulting	-75.00
Capital performance advisors llp	-77.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2025	318	35.32%	208,025,833	10.61%	92	1.33%	216	57.66%	64	-7.25%
Mar 31, 2025	233	0.43%	184,689,767	-4.20%	81	0.98%	136	-12.82%	69	27.78%
Dec 31, 2024	221	22.78%	183,252,476	-10.67%	88	0.90%	146	33.95%	53	26.19%
Sep 30, 2024	179	13.29%	205,122,767	3.97%	99	1.02%	108	17.39%	42	-6.67%
Jun 30, 2024	157	5.37%	197,287,838	4.61%	98	1.11%	91	18.18%	45	-6.25%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard US Total Market Shares ETF	6.34M	2.74%	519.30K
Vanguard Total Stock Mkt Idx Inv	6.04M	2.62%	-126.59K
T. Rowe Price Small-Cap Stock	5.76M	2.50%	153.09K
T. Rowe Price US Small-Cap Core Equity	5.76M	2.50%	220.07K
Janus Henderson US SMID Cap Growth	5.75M	2.50%	-821.39K
Janus Henderson US SMID Cap Growth MA	5.75M	2.50%	5.75M
Janus Henderson Triton D	5.75M	2.50%	-821.39K
iShares Russell 2000 ETF	4.96M	2.15%	-94.29K
Vanguard Small Cap Index	4.66M	2.02%	-27.51K
Vanguard Information Technology ETF	4.64M	2.01%	47.25K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Aug 11, 2025	Logan Thomas D	Chief Executive Officer	Sell	$6.93M
Aug 12, 2025	Logan Thomas D	Chief Executive Officer	Sell	$3.81M
Aug 05, 2025	Eloy Loic	Nuclear & Safety President	Sell	$472.14K
Jun 25, 2025	Schopfer Brian	Chief Financial Officer	Sell	$1.57M
May 21, 2025	Kingsley Lawrence D	-	Sell	$6.28M

Insider Transactions Trends

Date	Buy	Sell
2025 Q3	-	3
2025 Q2	-	4
2025 Q1	-	-
2024 Q4	-	3
2024 Q3	-	7

MIR Ownership FAQ

Who Owns Mirion?

Mirion shareholders are primarily institutional investors at 92.32%, followed by 4.18% insiders and 3.50% retail investors. The average institutional ownership in Mirion's industry, Industrial Machinery Stocks, is 74.87%, which Mirion exceeds.

Who owns the most shares of Mirion?

Mirion’s largest shareholders are Vanguard group (23.91M shares, 11.57%), T. rowe price investment management (20.96M shares, 9.30%), and Blackrock (15.8M shares, 7.91%). Together, they hold 28.78% of Mirion’s total shares outstanding.

Does Blackrock own Mirion?

Yes, BlackRock owns 7.91% of Mirion, totaling 15.8M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 169.72M$. In the last quarter, BlackRock increased its holdings by 246.89K shares, a 1.59% change.

Who is Mirion’s biggest shareholder by percentage of total assets invested?

Corsair capital management is Mirion’s biggest shareholder by percentage of total assets invested, with 12.48% of its assets in 3.03M Mirion shares, valued at 65.14M$.

Who is the top mutual fund holder of Mirion shares?

Vanguard US Total Market Shares ETF is the top mutual fund holder of Mirion shares, with 2.74% of its total shares outstanding invested in 6.34M Mirion shares.

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