Mirion Technologies MIR Institutional Ownership

Updated Oct 11, 2026

Mirion Technologies, Inc. (NYSE:MIR) was held by 347 institutional investors that filed 13F reports for the quarter ended June 30, 2026.

• Total shares held in MIR rose 3.29% from Q1 2026; the number of holders rose 16.84% from Q2 2025.
• Of the 347 holders, 194 added to their positions, 116 reduced their stakes and 37 left their positions unchanged in Q2 2026.
• Combined, institutional investors held 260.61Mn shares of MIR as of Q2 2026, up 8.31Mn from the prior quarter and up 55.38Mn from a year earlier.
• BlackRock, Inc. was the top holder of Mirion Technologies as of June 30, 2026, with 38.26Mn shares.
• The largest position increases in MIR for Q2 2026 were by Alyeska Investment Group, L.P. (+6.83Mn shares), Congress Asset Management Co (+5.57Mn shares), Goldman Sachs Group Inc (+3.06Mn shares), BAMCO Inc (+2.69Mn shares) and Maverick Capital LTD (+2.6Mn shares).
• The biggest cuts to MIR positions during Q2 2026 came from Millennium Management LLC (-4.12Mn shares), Bank of New York Mellon Corp (-3.16Mn shares), Citadel Advisors LLC (-1.79Mn shares), AllianceBernstein L.P. (-1.32Mn shares) and Franklin Templeton Inc (-1.11Mn shares).
• Per Business Quant data, the 10 largest holders of Mirion Technologies at the end of Q2 2026 were BlackRock, Inc. (38.26Mn shares), Vanguard Portfolio Management LLC (18.18Mn shares), T. Rowe Price Investment Management, Inc. (14.29Mn shares), Vanguard Capital Management LLC (10.61Mn shares), Goldman Sachs Group Inc (10.41Mn shares), State Street Corp (9.92Mn shares), Alyeska Investment Group, L.P. (9.53Mn shares), Leon G. Cooperman (8.38Mn shares), FMR LLC (7.33Mn shares) and Congress Asset Management Co (6.69Mn shares).