Mirion Ownership | Who Owns Mirion?

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Mirion Ownership Summary

Mirion is owned by 27.83% institutional investors, 3.82% insiders, and 68.35% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 15.49% of MIR shares. iShares Core S&P Small-Cap ETF is the top mutual fund, with 6.09% of its assets in Mirion shares.

MIR Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Mirion	27.83%	3.82%	68.35%
Sector	Industrials Stocks	47.66%	12.56%	39.78%
Industry	Industrial Machinery Stocks	47.74%	9.56%	42.70%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	37.86M	15.49%	$703.77M
Vanguard group	30.35M	13.51%	$710.71M
T. rowe price investment management	21.57M	9.57%	$501.64M
Blackrock	15.80M	7.91%	$169.72M
Tudor investment corp et al	17.50M	7.77%	$18.81M
Janus henderson group	8.33M	4.03%	$145.37M
Fmr	9.08M	4.03%	$211.16M
State street	8.82M	3.91%	$205.07M
Cooperman leon g	8.38M	3.72%	$195.00M
Geode capital management	5.79M	2.52%	$135.55M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Cooperman leon g	8.38M	6.09%	$195.00M
Two creeks capital management, lp	3.60M	6.02%	$83.71M
Corsair capital management	1.05M	4.02%	$24.33M
Element capital management	115.58K	3.81%	$2.69M
Chescapmanager	1.66M	3.24%	$38.86M
Pier capital	717.39K	2.68%	$16.80M
Bastion asset management	389.16K	2.22%	$7.29M
Montanaro asset management	305.30K	1.70%	$5.68M
Alta park capital, lp	611.16K	1.24%	$14.22M
Aperture investors	380.10K	1.21%	$8.84M

Top Buyers

Holder	Shares	% Assets	Change
Tudor investment corp et al	17.50M	0.03%	17.50M
Fmr	9.08M	0.01%	8.13M
State street	8.82M	0.01%	3.72M
Two creeks capital management, lp	3.60M	6.02%	3.60M
Vanguard fiduciary trust	1.69M	0.01%	1.69M

Top Sellers

Holder	Shares	% Assets	Change
P2 capital partners	-	-	-3.35M
Brown advisory	2.72M	0.08%	-2.68M
Maverick capital	-	-	-2.59M
Corsair capital management	1.05M	4.02%	-1.98M
Massachusetts financial services co /ma/	3.66M	0.03%	-1.73M

New Positions

Holder	Shares	% Assets	Change	Value
Two creeks capital management, lp	3.60M	6.02%	3.60M	$83.71M
Vanguard fiduciary trust	1.69M	0.01%	1.69M	$31.50M
Congress asset management co /ma	1.11M	0.15%	1.11M	$20.71M
Groupama asset managment	800.00K	0.02%	800.00K	$932.39K
Ghisallo capital management	774.90K	0.59%	774.90K	$18.02M

Sold Out

Holder	Change
Tortoise investment management	-3.00
Claris advisors, llc / mo /	-12.00
Physician wealth advisors	-29.00
Swan capital	-50.00
Wealthspire advisors	-60.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
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%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
iShares Core S&P Small-Cap ETF	14.91M	6.09%	3.19K
Vanguard Total Stock Mkt Idx Inv	7.35M	2.93%	-83.47K
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	5.63M	2.30%	47.47K
Vanguard Small Cap Index	5.37M	2.14%	20.49K
Vanguard Information Technology ETF	5.05M	2.01%	-5.74K
T. Rowe Price Small-Cap Stock	4.68M	1.86%	485.40K
T. Rowe Price US Small-Cap Core Equity	4.68M	1.86%	217.26K
Vanguard Small Cap Value Index Inv	3.41M	1.36%	-18.74K

Recent Insider Transactions

Date	Name	Role	Activity	Value
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
Nov 10, 2025	Lee Emmanuelle	Chief Legal Officer	Sell	$342.64K

Insider Transactions Trends

Date	Buy	Sell
2026 Q2	-	1
2026 Q1	-	-
2025 Q4	-	6
2025 Q3	-	3
2025 Q2	-	4

MIR Ownership FAQ

Who Owns Mirion?

Mirion shareholders are primarily institutional investors at 27.83%, followed by 3.82% insiders and 68.35% retail investors. The average institutional ownership in Mirion's industry, Industrial Machinery Stocks, is 47.74%, which Mirion falls below.

Who owns the most shares of Mirion?

Mirion’s largest shareholders are Blackrock funding, inc. /de (37.86M shares, 15.49%), Vanguard group (30.35M shares, 13.51%), and T. rowe price investment management (21.57M shares, 9.57%). Together, they hold 38.57% 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 6.09% of its assets in 8.38M Mirion shares, valued at 195M$.

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 6.09% of its total shares outstanding invested in 14.91M Mirion shares.

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