Mirion Ownership | Who Owns Mirion?

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Mirion Ownership Summary

Mirion is owned by 81.85% institutional investors, 4.48% insiders, and 13.67% retail investors. Vanguard group is the largest institutional shareholder, holding 11.57% of MIR shares. Janus Henderson US SMID Cap Growth MA is the top mutual fund, with 2.88% of its assets in Mirion shares.

MIR Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Mirion	81.85%	4.48%	13.67%
Sector	Industrials Stocks	39.35%	12.62%	48.03%
Industry	Industrial Machinery Stocks	44.92%	9.15%	45.93%

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	20.39M	9.86%	$355.77M
Blackrock	15.80M	7.91%	$169.72M
Blackrock funding, inc. /de	16.10M	7.79%	$280.98M
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	7.03M	3.40%	$122.59M
Maverick capital	6.18M	2.99%	$107.80M
Swedbank ab	6.06M	2.93%	$105.76M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Bornite capital management lp	2.12M	4.97%	$36.94M
Cooperman leon g	7.03M	4.64%	$122.59M
Ack asset management	1.81M	4.24%	$31.67M
Arosa capital management lp	493.00K	3.45%	$8.60M
Corsair capital management	1.72M	2.99%	$18.46M
Chescapmanager	1.33M	2.49%	$23.17M
Maverick capital	6.18M	1.94%	$107.80M
Pier capital	657.96K	1.64%	$11.48M
Roubaix capital	136.64K	1.14%	$2.38M
Hollow brook wealth management	210.38K	1.13%	$3.67M

Top Buyers

Holder	Shares	% Assets	Change
Maverick capital	6.18M	1.94%	5.99M
Arrowstreet capital, limited partnership	4.21M	0.06%	4.20M
Brown advisory	3.81M	0.08%	3.81M
William blair investment management	3.04M	0.13%	3.04M
Artemis investment management llp	2.19M	0.54%	2.19M

Top Sellers

Holder	Shares	% Assets	Change
Goldman sachs group	8.88M	0.02%	-25.93M
Swedbank ab	6.06M	0.13%	-4.16M
Alyeska investment group	3.76M	0.25%	-4.06M
P2 capital partners	-	-	-3.35M
Ack asset management	1.81M	4.24%	-2.43M

New Positions

Holder	Shares	% Assets	Change	Value
Brown advisory	3.81M	0.08%	3.81M	$66.52M
William blair investment management	3.04M	0.13%	3.04M	$53.07M
Artemis investment management llp	2.19M	0.54%	2.19M	$38.16M
Masters capital management	1.00M	0.64%	1.00M	$17.45M
Raymond james financial	983.61K	0.01%	983.61K	$17.16M

Sold Out

Holder	Change
Claris advisors, llc / mo /	-12.00
Anfield capital management	-45.00
Neo ivy capital management	-63.00
Capital performance advisors llp	-77.00
Steward partners investment advisory	-100.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Mar 31, 2024	149	12.03%	188,593,275	6.31%	94	1.16%	77	16.67%	48	17.07%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Janus Henderson US SMID Cap Growth MA	6.68M	2.88%	6.68M
Janus Henderson US SMID Cap Growth	6.57M	2.85%	-104.63K
Janus Henderson Triton D	6.57M	2.85%	-68.43K
Vanguard US Total Market Shares ETF	6.34M	2.74%	519.30K
Vanguard Total Stock Mkt Idx Inv	6.14M	2.66%	116.86K
T. Rowe Price US Small-Cap Core Equity	5.54M	2.39%	58.47K
T. Rowe Price Small-Cap Stock	5.54M	2.39%	6.54K
iShares Russell 2000 ETF	5.29M	2.30%	2.59K
Vanguard Small Cap Index	4.82M	2.09%	24.48K
T. Rowe Price Small-Cap Value	4.67M	2.02%	-70.11K

Recent Insider Transactions

Date	Name	Role	Activity	Value
May 21, 2025	Kingsley Lawrence D	-	Sell	$2.69M
May 21, 2025	Kingsley Lawrence D	-	Sell	$6.28M
May 21, 2025	Schopfer Brian	Chief Financial Officer	Sell	$1.37M
Dec 13, 2024	Eloy Loic	Technologies Group President	Sell	$787.16K
Oct 31, 2024	Lee Emmanuelle	Chief Legal Officer	Sell	$48.60K

Insider Transactions Trends

Date	Buy	Sell
2025 Q2	-	3
2025 Q1	-	-
2024 Q4	-	3
2024 Q3	-	7
2024 Q2	-	5

MIR Ownership FAQ

Who Owns Mirion?

Mirion shareholders are primarily institutional investors at 81.85%, followed by 4.48% insiders and 13.67% retail investors. The average institutional ownership in Mirion's industry, Industrial Machinery Stocks, is 44.92%, 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 (20.39M shares, 9.86%), and Blackrock (15.8M shares, 7.91%). Together, they hold 29.35% 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?

Bornite capital management lp is Mirion’s biggest shareholder by percentage of total assets invested, with 4.97% of its assets in 2.12M Mirion shares, valued at 36.94M$.

Who is the top mutual fund holder of Mirion shares?

Janus Henderson US SMID Cap Growth MA is the top mutual fund holder of Mirion shares, with 2.88% of its total shares outstanding invested in 6.68M Mirion shares.

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