Mirion Technologies

MIR • NYSE

Mirion Technologies is a industrial - machinery company in the industrials sector on NYSE, led by Thomas Logan, with a market cap of $6.2B. As of Q3 2025, 111% of shares are held by 335 institutional investors, with BlackRock, Inc. as the largest holder at 15.8%.

Chief Executive OfficerThomas Logan

Market Cap$6.2B

Industrial - Machinery

Industrials

Employees3.0K

Websitemirion.com

Country

United States of America

Overview

Overview of institutional ownership in MIR as of Q3 2025 with a market cap of $5.4B

All Institutions

Institutions: 335
Value Held: $5.9B
Shares Held: 255.6M
Avg Position: $17.7M
Median Position: $1.3M

Hedge Funds

Hedge Funds: 47
Value Held: $605.5M
Shares Held: 26.0M
Avg Position: $12.9M
Median Position: $6.9M

Ownership Breakdown

Institutional (non-HF)

99.57%

$5.3B

Hedge Funds

11.29%

$605.5M

Retail & Other

Based on market cap of $5.4B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in MIR as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
B BlackRock, Inc. Institution	-	$847.4M 0.01% of portfolio	15.80% 36.4M shares	Q4 2021 Held for 3y 11m	$5.67T
VANGUARD GROUP INC Institution	Salim Ramji CEO	$707.5M 0.01% of portfolio	13.20% 30.4M shares	Q4 2021 Held for 3y 11m	$6.69T
T T. Rowe Price Investment Management, Inc. Insurance Manager	John Edward Robison President	$501.6M 0.31% of portfolio	9.36% 21.6M shares	Q1 2023 Held for 2y 8m	$161.58B
FMR LLC Institution	-	$211.2M 0.01% of portfolio	3.94% 9.1M shares	Q4 2021 Held for 3y 11m	$1.92T
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$205.1M 0.01% of portfolio	3.82% 8.8M shares	Q4 2021 Held for 3y 11m	$2.88T
C COOPERMAN LEON G Institution	-	$195.0M 6.09% of portfolio	3.64% 8.4M shares	Q4 2021 Held for 3y 11m	$3.2B
HENDERSON GROUP PLC Institution	Ali Dibadj CEO	$178.2M 0.08% of portfolio	3.32% 7.7M shares	Q3 2021 Held for 4y 2m	$218.74B
DIMENSIONAL FUND ADVISORS LP Long Only Manager	Gerard Kieran O'Reilly CEO	$144.4M 0.03% of portfolio	2.69% 6.2M shares	Q2 2023 Held for 2y 5m	$466.32B
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$130.9M 0.01% of portfolio	2.44% 5.6M shares	Q4 2021 Held for 3y 11m	$1.57T
MASSACHUSETTS FINANCIAL SERVICES CO /MA/ Long Only Manager	Edward Murray Maloney CEO	$125.4M 0.04% of portfolio	2.34% 5.4M shares	Q2 2025 Held for 5 months	$322.72B

Net Capital Flow

Institutional buying and selling activity for MIR in Q3 2025

Net Flow: +$790.0M
Buyers: 133
Sellers: 136
Total Bought: +$1.5B
Total Sold: −$729.3M
Avg Position: $18.3M

Biggest Buyers

Institution	Net Bought	Current Position
B BlackRock, Inc. Institution	+$451.7M +19.4M shares	$847.4M 36.4M shares
FMR LLC Institution	+$189.1M +8.1M shares	$211.2M 9.1M shares
VANGUARD GROUP INC Institution	+$154.7M +6.7M shares	$707.5M 30.4M shares
GOLDMAN SACHS GROUP INC Institution	+$102.7M +4.4M shares	$117.6M 5.1M shares
STATE STREET CORP Institution	+$86.6M +3.7M shares	$205.1M 8.8M shares
UBS Group AG Institution	+$71.9M +3.1M shares	$111.6M 4.8M shares
MASSACHUSETTS FINANCIAL SERVICES CO /MA/ Long Only Manager	+$36.2M +1.6M shares	$125.4M 5.4M shares
AMERIPRISE FINANCIAL INC Institution	+$33.9M +1.5M shares	$39.9M 1.7M shares
Hood River Capital Management LLC Long Only Manager	+$30.1M +1.3M shares	$64.3M 2.8M shares
PRINCIPAL FINANCIAL GROUP INC Institution	+$29.9M +1.3M shares	$32.6M 1.4M shares

Biggest Sellers

Institution	Net Sold	Current Position
M MAVERICK CAPITAL LTD Hedge Fund•Long/Short	−$63.3M −2.7M shares	$60.2M 2.6M shares
B BROWN ADVISORY INC RIA/Wealth	−$62.3M −2.7M shares	$63.3M 2.7M shares
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	−$54.9M −2.4M shares	$12.1M 521.0K shares
A Artemis Investment Management LLP Institution	−$48.3M −2.1M shares	$22.2M 953.4K shares
CORSAIR CAPITAL MANAGEMENT LLC Hedge Fund•Multi-Strategy	−$46.0M −2.0M shares	$24.3M 1.0M shares
Bornite Capital Management LP Hedge Fund•Long/Short	−$36.1M −1.6M shares	$11.6M 500.0K shares
A Alyeska Investment Group, L.P. Hedge Fund•Multi-Strategy	−$30.7M −1.3M shares	$72.8M 3.1M shares
ACK Asset Management LLC Hedge Fund•Long/Short	−$28.8M −1.3M shares	Sold Off 0 shares
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Long Only Manager	−$21.7M −1.0M shares	Sold Off 0 shares
Select Equity Group, L.P. Hedge Fund•Multi-Strategy	−$20.6M −886.3K shares	$26.5M 1.1M shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited MIR in Q3 2025

New Positions: 64
New Value: $278.7M
Exited Positions: 48
Exited Value: $174.2M

New Positions

Institution	Position Value
T Two Creeks Capital Management, LP Hedge Fund•Long/Short	$83.7M 3.6M shares
Conestoga Capital Advisors, LLC Long Only Manager	$31.4M 1.4M shares
TimesSquare Capital Management, LLC Long Only Manager	$23.6M 1.0M shares
KEYSTONE INVESTORS PTE LTD RIA/Wealth	$20.5M 881.6K shares
Ghisallo Capital Management LLC Hedge Fund•Multi-Strategy	$18.0M 774.9K shares
Alta Park Capital, LP Hedge Fund•Long/Short	$14.2M 611.2K shares
P PEREGRINE CAPITAL MANAGEMENT LLC Long Only Manager	$10.3M 443.1K shares
Burkehill Global Management, LP Hedge Fund•Event Driven	$8.1M 350.0K shares
P PINNBROOK CAPITAL MANAGEMENT LP Hedge Fund•Global Macro	$7.8M 335.1K shares
G GREAT WEST LIFE ASSURANCE CO /CAN/ Institution	$7.6M 324.6K shares

Exited Positions

Institution	Previous Position
ACK Asset Management LLC Hedge Fund•Long/Short	$28.8M 1.3M shares
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Long Only Manager	$21.7M 1.0M shares
T TCW GROUP INC Institution	$15.7M 731.5K shares
T Troluce Capital Advisors LLC Hedge Fund•Multi-Strategy	$12.9M 600.0K shares
S Shannon River Fund Management CO LLC Hedge Fund•Long/Short	$12.0M 555.4K shares
Q Qube Research & Technologies Ltd Institution	$10.0M 464.0K shares
M MOORE CAPITAL MANAGEMENT, LP Hedge Fund•Global Macro	$8.8M 407.4K shares
SONA ASSET MANAGEMENT LLC Hedge Fund•Multi-Strategy	$6.8M 314.0K shares
Schonfeld Strategic Advisors LLC Hedge Fund•Multi-Strategy	$6.0M 278.4K shares
EAM Global Investors LLC Long Only Manager	$5.1M 236.2K shares

Options Activity

Institutions with the largest Call and Put options positions in MIR as of Q3 2025

Call Positions: 16
Call Value: $66.8M
Put Positions: 10
Put Value: $23.2M

Call Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$28.9M 12.4K contracts
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC Hedge Fund•Long/Short	$16.3M 7.0K contracts
P PEAK6 LLC Institution	$9.2M 4.0K contracts
J JANE STREET GROUP, LLC Institution	$3.5M 1.5K contracts
Walleye Trading LLC RIA/Wealth	$3.3M 1.4K contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$2.4M 1.0K contracts
T Twin Tree Management, LP Hedge Fund•Vol Arbitrage	$842.0K 362.0 contracts
P Parallax Volatility Advisers, LLC Hedge Fund•Vol Arbitrage	$665.2K 286.0 contracts
W WOLVERINE TRADING, LLC Institution	$620.7K 276.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$558.2K 240.0 contracts

Put Positions

Institution	Position Value
D D. E. Shaw & Co., Inc. Institution	$8.9M 3.8K contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$6.3M 2.7K contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$4.8M 2.1K contracts
J JANE STREET GROUP, LLC Institution	$1.2M 495.0 contracts
Walleye Trading LLC RIA/Wealth	$837.4K 360.0 contracts
W WOLVERINE TRADING, LLC Institution	$616.2K 274.0 contracts
T TORNO CAPITAL, LLC Institution	$348.9K 150.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$269.8K 116.0 contracts
CAPITAL FUND MANAGEMENT S.A. Hedge Fund•Quant Macro	- - contracts
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC Hedge Fund•Long/Short	- - contracts

Most Committed Institutions

Institutions with MIR as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
C Chescapmanager LLC Institution	-	6.16% $38.6M	0.72% 1.7M shares	Q1 2024 Held for 1y 8m	$626.3M
C COOPERMAN LEON G Institution	-	6.09% $195.0M	3.64% 8.4M shares	Q4 2021 Held for 3y 11m	$3.2B
T Two Creeks Capital Management, LP Hedge Fund•Long/Short	Ryan Allen Pedlow CEO	6.02% $83.7M	1.56% 3.6M shares	Q3 2025 Held for 2 months	$1.4B
CORSAIR CAPITAL MANAGEMENT LLC Hedge Fund•Multi-Strategy	Jeffrey Archer Zelin COO	4.32% $24.3M	0.45% 1.0M shares	Q3 2020 Held for 5y 2m	$563.6M
ELEMENT CAPITAL MANAGEMENT LLC Hedge Fund•Multi-Strategy	Jeffrey Marc Talpins CEO	3.81% $2.7M	0.05% 115.6K shares	Q3 2025 Held for 2 months	$70.6M
Pier Capital, LLC Long Only Manager	Jan Eric Parsons Chairman	2.89% $18.5M	0.34% 794.8K shares	Q4 2024 Held for 11 months	$639.8M
KEYSTONE INVESTORS PTE LTD RIA/Wealth	Kevin Michael Mccann CCO	2.38% $20.5M	0.38% 881.6K shares	Q3 2025 Held for 2 months	$860.1M
Hollow Brook Wealth Management LLC RIA/Wealth	Alan Lee Bazaar CEO	1.41% $5.9M	0.11% 255.7K shares	Q4 2023 Held for 1y 11m	$422.7M
P PINNBROOK CAPITAL MANAGEMENT LP Hedge Fund•Global Macro	Zachary Mitchell Kurz CIO	1.41% $7.8M	0.15% 335.1K shares	Q3 2025 Held for 2 months	$554.3M
Alta Park Capital, LP Hedge Fund•Long/Short	Connor Patrick Joyce CFO	1.39% $14.2M	0.27% 611.2K shares	Q3 2025 Held for 2 months	$1.0B

Hedge Fund Spotlight

Discover hedge funds investing in MIR

DRIEHAUS CAPITAL MANAGEMENT LLC

Hedge Fund • Event Driven

Portfolio ManagerStephen Thomas Weber

Portfolio Value: $13.9B
Positions: 419
Last Reported: Q3 2025

Sector Allocation

Position in Mirion Technologies

Market Value: $46.2M
Shares Held: 2.0M
Portfolio Weight: 0.33%
Owned Since: 2025-Q2

Top Holding	Sector	Market Value	Weight
1 Taiwan Semiconductor Manufacturing Company TSM	Semiconductors Technology	$626.6M	4.49%
2 Crinetics Pharmaceuticals CRNX	Biotechnology Healthcare	$270.0M	1.94%
3 Planet Labs PL	Aerospace & Defense Industrials	$186.6M	1.34%