Mirion Ownership | Who Owns Mirion?

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Mirion Ownership Summary

Mirion is owned by 109.48% institutional investors, 3.38% insiders. 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	109.48%	3.38%	-12.86%
Sector	Industrials Stocks	48.69%	15.99%	35.32%
Industry	Industrial Machinery Stocks	44.20%	11.71%	44.10%

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
Blackrock	15.80M	7.91%	$169.72M
Tudor investment corp et al	17.50M	7.77%	$18.81M
T. rowe price investment management	14.63M	5.98%	$271.93M
State street	9.43M	3.86%	$175.30M
Cooperman leon g	8.38M	3.43%	$155.85M
Goldman sachs group	7.35M	3.01%	$136.63M
Fmr	6.55M	2.68%	$121.80M
Geode capital management	5.94M	2.43%	$110.45M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Cooperman leon g	8.38M	5.11%	$155.85M
Two creeks capital management, lp	2.45M	4.68%	$45.53M
Element capital management	115.58K	3.81%	$2.69M
Alta park capital, lp	977.14K	2.83%	$18.16M
Chescapmanager	1.66M	2.76%	$30.84M
Corsair capital management	982.42K	2.71%	$18.26M
Bastion asset management	389.16K	2.22%	$7.29M
Pier capital	703.81K	2.16%	$13.08M
Troluce capital advisors	1.50M	1.71%	$27.89M
Montanaro asset management	305.30K	1.70%	$5.68M

Top Buyers

Holder	Shares	% Assets	Change
Tudor investment corp et al	17.50M	0.03%	17.50M
Millennium management	5.11M	0.04%	5.11M
Maverick capital	2.65M	0.57%	2.65M
Goldman sachs group	7.35M	0.02%	2.10M
Vanguard fiduciary trust	1.69M	0.01%	1.69M

Top Sellers

Holder	Shares	% Assets	Change
P2 capital partners	-	-	-3.35M
Hood river capital management	-	-	-2.78M
Driehaus capital management	-	-	-2.30M
Massachusetts financial services co /ma/	1.59M	0.01%	-2.07M
Fmr	6.55M	0.01%	-1.86M

New Positions

Holder	Shares	% Assets	Change	Value
Vanguard fiduciary trust	1.69M	0.01%	1.69M	$31.50M
Congress asset management co /ma	1.11M	0.15%	1.11M	$20.71M
Fred alger management	909.61K	0.07%	909.61K	$16.91M
Groupama asset managment	800.00K	0.02%	800.00K	$932.39K
Yaupon capital management lp	525.00K	0.47%	525.00K	$12.21M

Sold Out

Holder	Change
Tortoise investment management	-3.00
Claris advisors, llc / mo /	-12.00
Physician wealth advisors	-29.00
Wealthspire advisors	-60.00
Bellevue asset management	-66.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Mar 31, 2025	233	0.43%	184,689,767	-4.20%	81	0.98%	136	-12.82%	69	27.78%

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	7.37M	3.01%	20.30K
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	5.36M	2.19%	-10.95K
Vanguard Information Technology ETF	5.08M	2.08%	26.86K
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	3.42M	1.40%	5.24K

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 109.48%, followed by 3.38% insiders and -12.86% retail investors. The average institutional ownership in Mirion's industry, Industrial Machinery Stocks, is 44.20%, which Mirion exceeds.

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 Blackrock (15.8M shares, 7.91%). Together, they hold 36.91% 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 5.11% of its assets in 8.38M Mirion shares, valued at 155.85M$.

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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