Mirion Ownership | Who Owns Mirion?

Overview Forecast RevenueFinancials Chart Transcripts

Mirion Ownership Summary

Mirion is owned by 107.97% institutional investors, 3.41% insiders. Blackrock funding, inc. /de is the largest institutional shareholder, holding 15.64% of MIR shares. iShares Core S&P Small-Cap ETF is the top mutual fund, with 5.98% of its assets in Mirion shares.

MIR Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Mirion	107.97%	3.41%	-11.38%
Sector	Industrials Stocks	67.76%	16.49%	15.75%
Industry	Industrial Machinery Stocks	139.45%	11.60%	-51.05%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	38.26M	15.64%	$686.04M
Vanguard group	30.35M	13.51%	$710.71M
Blackrock	15.80M	7.91%	$169.72M
Tudor investment corp et al	17.50M	7.77%	$18.81M
T. rowe price investment management	14.29M	5.84%	$256.19M
Vanguard capital management	10.61M	4.34%	$190.31M
Goldman sachs group	10.41M	4.25%	$186.59M
State street	9.92M	4.06%	$177.93M
Alyeska investment group	9.53M	3.90%	$170.96M
Cooperman leon g	8.38M	3.43%	$150.32M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Cooperman leon g	8.38M	4.24%	$150.32M
Element capital management	115.58K	3.81%	$2.69M
Troluce capital advisors	1.54M	2.84%	$27.60M
Chescapmanager	1.66M	2.53%	$29.75M
Montanaro asset management	418.65K	2.37%	$7.51M
Corsair capital management	867.67K	1.94%	$15.56M
Pier capital	696.05K	1.65%	$12.48M
Bastion asset management	272.55K	1.59%	$4.68M
Summit creek advisors	198.42K	1.21%	$3.56M
Kingdon capital management	375.00K	1.08%	$8.72M

Top Buyers

Holder	Shares	% Assets	Change
Tudor investment corp et al	17.50M	0.03%	17.50M
Alyeska investment group	9.53M	0.44%	6.83M
Congress asset management co /ma	6.69M	0.74%	5.57M
Goldman sachs group	10.41M	0.02%	3.06M
Bamco inc /ny/	3.91M	0.11%	2.69M

Top Sellers

Holder	Shares	% Assets	Change
Millennium management	991.74K	0.01%	-4.12M
P2 capital partners	-	-	-3.35M
Bank of new york mellon	1.38M	0.00%	-3.16M
Hood river capital management	-	-	-2.78M
Two creeks capital management, lp	-	-	-2.45M

New Positions

Holder	Shares	% Assets	Change	Value
Sixth street partners management company	2.45M	0.01%	2.45M	$43.88M
Royal london asset management	1.18M	0.04%	1.18M	$21.09M
Clearbridge investments	1.10M	0.02%	1.10M	$19.66M
Exoduspoint capital management, lp	605.13K	0.07%	605.13K	$10.85M
Nissay asset management corp /japan/ /adv	599.28K	0.05%	599.28K	$10.75M

Sold Out

Holder	Change
Hughes financial services	-1.00
Tortoise investment management	-3.00
Dunhill financial	-4.00
Massmutual trust co fsb/adv	-11.00
Vermillion wealth management	-11.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2026	372	-2.11%	264,153,739	4.20%	107	1.00%	199	0.51%	120	-11.11%
Mar 31, 2026	369	-3.91%	251,757,302	-0.16%	109	0.91%	193	-15.72%	130	32.65%
Dec 31, 2025	120	-66.76%	62,503,081	-75.57%	27	0.22%	70	-68.61%	30	-66.29%
Sep 30, 2025	135	-57.81%	60,365,470	-71.00%	26	0.31%	85	-60.65%	29	-56.06%
Jun 30, 2025	318	35.32%	208,025,833	10.61%	92	1.33%	216	57.66%	64	-7.25%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
iShares Core S&P Small-Cap ETF	14.90M	5.98%	-11.73K
Vanguard Total Stock Mkt Idx Inv	7.37M	3.01%	-2.04K
Vanguard MStar Total Stk Mkt Idx Invest	7.40M	2.97%	26.32K
Vanguard Morn Total Stk Mkt Idx Investor	7.37M	2.96%	-2.04K
Vanguard US Total Market Shares ETF	6.34M	2.74%	519.30K
Janus Henderson US SMID Cap Growth MA	5.75M	2.50%	5.75M
iShares Russell 2000 ETF	6.15M	2.47%	-109.25K
Vanguard Small Cap Index	5.34M	2.14%	7.73K
T. Rowe Price US Small-Cap Core Equity	5.20M	2.13%	526.23K
T. Rowe Price Small-Cap Stock	5.20M	2.13%	429.06K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Sep 02, 2026	Schopfer Brian	Chief Financial Officer	Buy	$312.00K
May 07, 2026	Moore Christopher A.	Chief Accounting Officer (PAO)	Sell	$164.98K
Dec 10, 2025	Kingsley Lawrence D	-	Sell	$8.65M
Nov 21, 2025	Kingsley Lawrence D	-	Sell	$7.15M
Nov 11, 2025	Eloy Loic	Nuclear & Safety President	Sell	$1.23M

Insider Transactions Trends

Date	Buy	Sell
2026 Q3	1	-
2026 Q2	-	1
2026 Q1	-	-
2025 Q4	-	6
2025 Q3	-	3

MIR Ownership FAQ

Who Owns Mirion?

Mirion shareholders are primarily institutional investors at 107.97%, followed by 3.41% insiders and -11.38% retail investors. The average institutional ownership in Mirion's industry, Industrial Machinery Stocks, is 139.45%, which Mirion falls below.

Who owns the most shares of Mirion?

Mirion’s largest shareholders are Blackrock funding, inc. /de (38.26M shares, 15.64%), Vanguard group (30.35M shares, 13.51%), and Blackrock (15.8M shares, 7.91%). Together, they hold 37.06% 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?

Cooperman leon g is Mirion’s biggest shareholder by percentage of total assets invested, with 4.24% of its assets in 8.38M Mirion shares, valued at 150.32M$.

Who is the top mutual fund holder of Mirion shares?

iShares Core S&P Small-Cap ETF is the top mutual fund holder of Mirion shares, with 5.98% of its total shares outstanding invested in 14.9M Mirion shares.

Try Tickergate Pro Free

Customize Everything. 100% Flexibility. Fast and Easy to Use (No code or Excel Needed)

Customize your own personal stocks lists, views and charts
Choose from hundreds of fields, up to 15 years of history
Conduct deep comparison analysis

Discover trending investment themes
Find your next best investment
Research stocks using tools