MIR Mirion Technologies, Inc.
Mirion Technologies, Inc. (MIR) Institutional Ownership
What the institutions did with MIR last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| BlackRock, Inc. | 38.3M | 14.6% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 18.2M | 6.9% |
| T. Rowe Price Investment Management, Inc. | 14.3M | 5.4% |
| VANGUARD CAPITAL MANAGEMENT LLC | 10.6M | 4.0% |
| GOLDMAN SACHS GROUP INC | 10.4M | 4.0% |
| STATE STREET CORP | 9.9M | 3.8% |
| Alyeska Investment Group, L.P. | 9.5M | 3.6% |
| COOPERMAN LEON G | 8.4M | 3.2% |
| FMR LLC | 7.3M | 2.8% |
| CONGRESS ASSET MANAGEMENT CO | 6.7M | 2.5% |
| GEODE CAPITAL MANAGEMENT, LLC | 6.3M | 2.4% |
| MAVERICK CAPITAL LTD | 5.2M | 2.0% |
| DIMENSIONAL FUND ADVISORS LP | 4.9M | 1.9% |
| Jupiter Topco LLC | 4.1M | 1.6% |
| BAMCO INC /NY/ | 3.9M | 1.5% |
| MORGAN STANLEY | 3.9M | 1.5% |
| NEUBERGER BERMAN GROUP LLC | 3.2M | 1.2% |
| AMERICAN CENTURY COMPANIES INC | 3.2M | 1.2% |
| Invesco Ltd. | 2.8M | 1.1% |
| UBS Group AG | 2.7M | 1.0% |
| JPMORGAN CHASE & CO | 2.6M | 1.0% |
| NORTHERN TRUST CORP | 2.6M | 1.0% |
| Swedbank AB | 2.5M | 1.0% |
| LOOMIS SAYLES & CO L P | 2.5M | 1.0% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 2.4M | 0.9% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Alyeska Investment Group, L.P. | Increased | 2.7M | 9.5M | +6.8M |
| CONGRESS ASSET MANAGEMENT CO | Increased | 1.1M | 6.7M | +5.6M |
| MILLENNIUM MANAGEMENT LLC | Reduced | 5.1M | 991.7K | -4.1M |
| Bank of New York Mellon Corp | Reduced | 4.5M | 1.4M | -3.2M |
| GOLDMAN SACHS GROUP INC | Increased | 7.3M | 10.4M | +3.1M |
| BAMCO INC /NY/ | Increased | 1.2M | 3.9M | +2.7M |
| MAVERICK CAPITAL LTD | Increased | 2.6M | 5.2M | +2.6M |
| Two Creeks Capital Management, LP | Sold Out | 2.4M | 0 | -2.4M |
| NEUBERGER BERMAN GROUP LLC | Increased | 856.4K | 3.2M | +2.3M |
| CITADEL ADVISORS LLC | Reduced | 1.8M | 32.8K | -1.8M |
| MORGAN STANLEY | Increased | 2.3M | 3.9M | +1.6M |
| ALLIANCEBERNSTEIN L.P. | Reduced | 1.7M | 332.5K | -1.3M |
| BROWN ADVISORY INC | Sold Out | 1.3M | 0 | -1.3M |
| Daiwa Securities Group Inc. | Sold Out | 1.2M | 0 | -1.2M |
| ROYAL LONDON ASSET MANAGEMENT LTD | New | 0 | 1.2M | +1.2M |
| FRANKLIN RESOURCES INC | Reduced | 2.0M | 884.5K | -1.1M |
| Clearbridge Investments, LLC | New | 0 | 1.1M | +1.1M |
| VOYA INVESTMENT MANAGEMENT LLC | Reduced | 1.2M | 79.0K | -1.1M |
| UBS Group AG | Reduced | 3.8M | 2.7M | -1.1M |
| Alta Park Capital, LP | Sold Out | 977.1K | 0 | -977.1K |
| LORD, ABBETT & CO. LLC | Sold Out | 937.0K | 0 | -937.0K |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | Reduced | 1.6M | 761.0K | -828.3K |
| FMR LLC | Increased | 6.6M | 7.3M | +777.7K |
| FRED ALGER MANAGEMENT, LLC | Reduced | 909.6K | 156.1K | -753.5K |
| OBERWEIS ASSET MANAGEMENT INC/ | Sold Out | 744.3K | 0 | -744.3K |
| BNP PARIBAS FINANCIAL MARKETS | Reduced | 1.1M | 450.9K | -660.5K |
| Swedbank AB | Reduced | 3.2M | 2.5M | -628.8K |
| ExodusPoint Capital Management, LP | New | 0 | 605.1K | +605.1K |
| NISSAY ASSET MANAGEMENT CORP /JAPAN | New | 0 | 599.3K | +599.3K |
| WCM INVESTMENT MANAGEMENT, LLC | New | 0 | 591.3K | +591.3K |
| Conestoga Capital Advisors, LLC | Reduced | 1.8M | 1.2M | -583.0K |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | Reduced | 727.3K | 165.4K | -561.9K |
| HRT FINANCIAL LP | New | 0 | 539.9K | +539.9K |
| Artemis Investment Management LLP | Sold Out | 539.1K | 0 | -539.1K |
| Select Equity Group, L.P. | Increased | 1.1M | 1.6M | +520.6K |
| Ensign Peak Advisors, Inc | Reduced | 631.4K | 116.0K | -515.4K |
| Point72 Asset Management, L.P. | Increased | 174.3K | 677.5K | +503.2K |
| STATE STREET CORP | Increased | 9.4M | 9.9M | +493.6K |
| OSAIC HOLDINGS, INC. | Increased | 185.0K | 670.5K | +485.4K |
| Invesco Ltd. | Increased | 2.3M | 2.8M | +475.3K |
| SCHRODER INVESTMENT MANAGEMENT GROUP | Increased | 1.1M | 1.6M | +458.8K |
| CITIGROUP INC | Reduced | 1.0M | 598.8K | -449.3K |
| AMERICAN CENTURY COMPANIES INC | Increased | 2.7M | 3.2M | +443.5K |
| BlackRock, Inc. | Increased | 37.9M | 38.3M | +404.6K |
| SEI INVESTMENTS CO | Increased | 458.4K | 849.5K | +391.1K |
| ZACKS INVESTMENT MANAGEMENT | Sold Out | 388.9K | 0 | -388.9K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 5.9M | 6.3M | +339.9K |
| T. Rowe Price Investment Management, Inc. | Reduced | 14.6M | 14.3M | -339.7K |
| Davidson Kempner Capital Management LP | Increased | 1.3M | 1.6M | +305.2K |
| Stephens Investment Management Group LLC | Increased | 1.4M | 1.7M | +303.5K |
| FRONTIER CAPITAL MANAGEMENT CO LLC | New | 0 | 299.0K | +299.0K |
| AMERIPRISE FINANCIAL INC | Reduced | 1.3M | 1.0M | -287.4K |
| SCHWARTZ INVESTMENT COUNSEL INC | Reduced | 854.3K | 573.9K | -280.4K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 17.9M | 18.2M | +274.1K |
| WELLINGTON MANAGEMENT GROUP LLP | Increased | 837.8K | 1.1M | +261.2K |
| Holocene Advisors, LP | Increased | 85.1K | 337.7K | +252.7K |
| NORTHERN TRUST CORP | Increased | 2.4M | 2.6M | +219.8K |
| Allspring Global Investments Holdings, LLC | Reduced | 1.1M | 846.8K | -212.2K |
| Cambridge Investment Research Advisors, Inc. | New | 0 | 200.8K | +200.8K |
| BANK OF AMERICA CORP /DE/ | Reduced | 1.4M | 1.2M | -197.2K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.