MIR Institutional Ownership & Shareholders
MIRION TECHNOLOGIES INC (MIR) is currently held by 335 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $4.59B based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of MIR tracked by InsiderSet, reporting ownership valued at approximately $686.04M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $635.92M, representing an estimated loss of -7.31% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 52% of the total disclosed MIR value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Portfolio Management Llc, T. Rowe Price Investment Management, Inc., and several other long-term asset managers with concentrated positions in MIRION TECHNOLOGIES INC (MIR).
This page ranks the largest institutional MIR shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
335
Total Reported Value
$4.59B
Largest Holder
Blackrock, Inc.
Largest Position
$686.04M
Insider Transactions (90d)
3
Latest Filing Quarter
Q2 2026
New Institutional Positions
56
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.01% | 38,262,307 | $686,043,174 | $635,919,542 | -$50,123,632 | -7.31% | |
| Vanguard Portfolio Management Llc | 0.01% | 18,179,850 | $325,964,711 | $302,149,107 | -$23,815,604 | -7.31% | |
| T. Rowe Price Investment Management, Inc. | 0.17% | 14,288,075 | $256,186,000 | $237,467,807 | -$18,718,194 | -7.31% | |
| Vanguard Capital Management Llc | 0.00% | 10,613,869 | $190,306,671 | $176,402,503 | -$13,904,168 | -7.31% | |
| Goldman Sachs Group Inc | 0.02% | 10,406,605 | $186,590,423 | $172,957,775 | -$13,632,648 | -7.31% | |
| State Street Corp | 0.01% | 9,923,609 | $177,930,309 | $164,930,382 | -$12,999,927 | -7.31% | |
| Alyeska Investment Group, L.P. | 0.44% | 9,534,955 | $170,961,743 | $158,470,952 | -$12,490,791 | -7.31% | |
| Cooperman Leon G | 4.24% | 8,383,441 | $150,315,097 | $139,332,789 | -$10,982,308 | -7.31% | |
| Fmr Llc | 0.01% | 7,329,386 | $131,415,889 | $121,814,395 | -$9,601,494 | -7.31% | |
| Geode Capital Management, Llc | 0.01% | 6,280,048 | $112,622,147 | $104,374,398 | -$8,247,749 | -7.32% | |
| Maverick Capital Ltd | 0.85% | 5,245,039 | $94,043,549 | $87,172,548 | -$6,871,001 | -7.31% | |
| Dimensional Fund Advisors Lp | 0.02% | 4,859,755 | $87,125,072 | $80,769,128 | -$6,355,944 | -7.30% | |
| Congress Asset Management Co | 0.55% | 6,034,528 | $85,207,535 | $100,293,855 | +$15,086,320 | +17.71% | |
| Janus Henderson Group Plc | 0.04% | 4,043,089 | $75,163,723 | $67,196,139 | -$7,967,584 | -10.60% | |
| Bamco Inc | 0.11% | 3,906,083 | $70,036,068 | $64,919,099 | -$5,116,969 | -7.31% | |
| Morgan Stanley | 0.00% | 3,896,754 | $69,868,819 | $64,764,051 | -$5,104,768 | -7.31% | |
| Neuberger Berman Group Llc | 0.04% | 3,199,539 | $57,367,734 | $53,176,338 | -$4,191,396 | -7.31% | |
| American Century Companies Inc | 0.03% | 3,176,241 | $56,950,035 | $52,789,125 | -$4,160,910 | -7.31% | |
| Invesco Ltd. | 0.00% | 2,769,589 | $49,658,731 | $46,030,569 | -$3,628,162 | -7.31% | |
| Ubs Group Ag | 0.01% | 2,686,713 | $48,172,763 | $44,653,170 | -$3,519,593 | -7.31% | |
| Northern Trust Corp | 0.01% | 2,586,059 | $46,368,038 | $42,980,301 | -$3,387,737 | -7.31% | |
| Jpmorgan Chase & Co | 0.00% | 2,606,507 | $45,694,266 | $43,320,146 | -$2,374,120 | -5.20% | |
| Swedbank Ab | 0.04% | 2,531,200 | $45,384,416 | $42,068,544 | -$3,315,872 | -7.31% | |
| Loomis Sayles & Co L P | 0.06% | 2,525,188 | $45,276,621 | $41,968,625 | -$3,307,996 | -7.31% | |
| Charles Schwab Investment Management Inc | 0.01% | 2,447,222 | $43,878,690 | $40,672,830 | -$3,205,860 | -7.31% | |
| Nuveen, Llc | 0.01% | 2,109,181 | $37,817,615 | $35,054,588 | -$2,763,027 | -7.31% | |
| Royal Bank Of Canada | 0.01% | 1,782,618 | $31,962,000 | $29,627,111 | -$2,334,889 | -7.31% | |
| Vanguard Fiduciary Trust Co | 0.01% | 1,723,956 | $30,910,531 | $28,652,149 | -$2,258,382 | -7.31% | |
| Stephens Investment Management Group Llc | 0.32% | 1,678,373 | $30,093,228 | $27,894,559 | -$2,198,669 | -7.31% | |
| Chescapmanager Llc | 3.86% | 1,659,137 | $29,748,326 | $27,574,857 | -$2,173,469 | -7.31% | |
| Davidson Kempner Capital Management Lp | 0.47% | 1,619,998 | $29,046,564 | $26,924,367 | -$2,122,197 | -7.31% | |
| Select Equity Group, L.P. | 0.15% | 1,576,023 | $28,258,092 | $26,193,502 | -$2,064,590 | -7.31% | |
| Schroder Investment Management Group | 0.02% | 1,594,840 | $27,845,906 | $26,506,241 | -$1,339,665 | -4.81% | |
| Troluce Capital Advisors Llc | 10.34% | 1,539,212 | $27,598,071 | $25,581,703 | -$2,016,368 | -7.31% | |
| Rockefeller Capital Management L.P. | 0.04% | 1,466,144 | $26,287,963 | $24,367,313 | -$1,920,650 | -7.31% | |
| Timessquare Capital Management, Llc | 0.37% | 1,400,642 | $25,113,511 | $23,278,670 | -$1,834,841 | -7.31% | |
| Bank Of New York Mellon Corp | 0.00% | 1,381,674 | $24,773,420 | $22,963,422 | -$1,809,998 | -7.31% | |
| Emerald Advisers, Llc | 0.58% | 1,364,780 | $24,470,505 | $22,682,644 | -$1,787,861 | -7.31% | |
| Conestoga Capital Advisors, Llc | 0.49% | 1,248,061 | $22,377,734 | $20,742,774 | -$1,634,960 | -7.31% | |
| Principal Financial Group Inc | 0.01% | 1,194,106 | $21,410,320 | $19,846,042 | -$1,564,278 | -7.31% | |
| Royal London Asset Management Ltd | 0.04% | 1,176,241 | $21,090,001 | $19,549,125 | -$1,540,876 | -7.31% | |
| Bank Of America Corp | 0.00% | 1,158,094 | $20,764,625 | $19,247,522 | -$1,517,103 | -7.31% | |
| Segall Bryant & Hamill, Llc | 0.24% | 1,131,124 | $20,281,053 | $18,799,281 | -$1,481,772 | -7.31% | |
| Wellington Management Group Llp | 0.00% | 1,098,987 | $19,704,837 | $18,265,164 | -$1,439,673 | -7.31% | |
| Clearbridge Investments, Llc | 0.02% | 1,096,729 | $19,664,354 | $18,227,636 | -$1,436,718 | -7.31% | |
| Ameriprise Financial Inc | 0.00% | 1,002,284 | $17,970,953 | $16,657,960 | -$1,312,993 | -7.31% | |
| Millennium Management Llc | 0.01% | 991,741 | $17,781,916 | $16,482,735 | -$1,299,181 | -7.31% | |
| Jennison Associates Llc | 0.01% | 887,170 | $15,906,960 | $14,744,765 | -$1,162,195 | -7.31% | |
| Emerald Mutual Fund Advisers Trust | 0.55% | 873,466 | $15,661,245 | $14,517,005 | -$1,144,240 | -7.31% | |
| Corsair Capital Management, L.P. | 1.96% | 867,670 | $15,557,323 | $14,420,675 | -$1,136,648 | -7.31% |
Frequently asked questions about MIR
Who are the largest institutional holders of MIR?
The largest institutional holders of MIR reported in the latest SEC Form 13F filings include Blackrock, Inc., Vanguard Portfolio Management Llc, T. Rowe Price Investment Management, Inc., Vanguard Capital Management Llc, and Goldman Sachs Group Inc. InsiderSet ranks institutional holders by their latest reported MIR position.
What is MIR institutional ownership?
This page tracks MIR positions reported by institutional investment managers through SEC Form 13F. MIRION TECHNOLOGIES INC (MIR) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own MIR?
InsiderSet currently tracks 335 institutional managers reporting MIR holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of MIR shareholders.
How much MIR stock do institutions own?
Institutional investment managers disclosed approximately $4.59B in MIR holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was MIR institutional ownership last updated?
The latest MIR institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional MIR holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its MIR position after the reporting date.
Are institutions buying or selling MIR?
Institutional buying and selling can be analyzed by comparing MIR positions across consecutive 13F reporting periods. InsiderSet's MIR Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View MIR ownership changes.
How has MIR institutional ownership changed over time?
InsiderSet tracks MIR institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.