Mirion Technologies
MIR
362 hedge funds and large institutions have $4.71B invested in Mirion Technologies in 2026 Q1 according to their latest regulatory filings, with 62 funds opening new positions, 136 increasing their positions, 131 reducing their positions, and 58 closing their positions.
660% more call options, than puts
Call options by funds: $76.6M | Put options by funds: $10.1M
1.85% more ownership
Funds ownership: 101.76% → 103.61% (+1.8%)
7% more first-time investments, than exits
New positions opened: 62 | Existing positions closed: 58
4% more repeat investments, than reductions
Existing positions increased: 136 | Existing positions reduced: 131
0% more funds holding in top 10
Funds holding in top 10: 6 → 6 (0)
1% less funds holding
Funds holding: 365 → 362 (-3)
20% less capital invested
Capital invested by funds: $5.91B → $4.71B (-$1.19B)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Millennium Management
New York
|
+$115M |
| 2 |
MC
Maverick Capital
Dallas,
Texas
|
+$59.8M |
| 3 |
Goldman Sachs
New York
|
+$47.4M |
| 4 |
Bank of New York Mellon
New York
|
+$32.9M |
| 5 |
AllianceBernstein
Nashville,
Tennessee
|
+$30.1M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
HRCM
Hood River Capital Management
Palm Beach Gardens,
Florida
|
-$65.1M |
| 2 |
DCM
Driehaus Capital Management
Chicago,
Illinois
|
-$53.8M |
| 3 |
Massachusetts Financial Services
Boston,
Massachusetts
|
-$46.8M |
| 4 |
Fidelity Investments
Boston,
Massachusetts
|
-$42M |
| 5 |
AIM
Artemis Investment Management
Edinburgh,
United Kingdom
|
-$32.3M |
MIR Hedge Fund Activity: Q1 2026 in Review
362 of the 8,187 institutional investors tracked by Wall St. Rank reported a position in Mirion Technologies (MIR) for Q1 2026, worth a combined $4.71B — down 20% from $5.91B a quarter earlier.
Buyers outnumbered sellers: 62 funds opened new MIR positions and 58 closed out — a net gain of 4 holders — while 136 added to existing stakes and 131 trimmed.
The largest buyer was Millennium Management, opening a new position worth an estimated $115M. The largest seller was Hood River Capital Management, exiting entirely with an estimated $65.1M sold.
- 362 institutional investors held Mirion Technologies (MIR) as of Q1 2026, down from 365 in Q4 2025.
- Funds reported $4.71B of Mirion Technologies stock for Q1 2026, down 20% quarter-over-quarter.
- 62 funds opened new Mirion Technologies positions in Q1 2026 and 58 closed out, a net change of +4 holders.
- The largest Mirion Technologies buyer in Q1 2026 was Millennium Management, an estimated $115M added.
- The largest Mirion Technologies seller in Q1 2026 was Hood River Capital Management, an estimated $65.1M sold.
Based on aggregated 13F filings for Q1 2026.