Janus Henderson Group
MIR icon

Janus Henderson Group’s Mirion Technologies MIR Stock Holding History

Janus Henderson Group’s Portfolio MIR Stock Details MIR Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$75.2M Sell
4,043,089
-553,860
-12% -$12.5M 0.04% 333
2025
Q4 		$108M Sell
4,596,949
-3,064,988
-40% -$76.4M 0.05% 275
2025
Q3 		$178M Sell
7,661,937
-326,459
-4% -$7.06M 0.08% 199
2025
Q2 		$172M Sell
7,988,396
-599,268
-7% -$10.3M 0.08% 201
2025
Q1 		$126M Buy
8,587,664
+257,169
+3% +$4.04M 0.07% 234
2024
Q4 		$145M Buy
8,330,495
+229,718
+3% +$3.56M 0.07% 232
2024
Q3 		$89.7M Sell
8,100,777
-584,490
-7% -$6.15M 0.05% 291
2024
Q2 		$93.3M Sell
8,685,267
-717,847
-8% -$7.63M 0.05% 274
2024
Q1 		$107M Buy
9,403,114
+3,929
+0% +$39.4K 0.06% 254
2023
Q4 		$96.3M Buy
9,399,185
+671,309
+8% +$5.67M 0.06% 256
2023
Q3 		$65.2M Sell
8,727,876
-976,433
-10% -$7.69M 0.04% 312
2023
Q2 		$82M Sell
9,704,309
-1,296,238
-12% -$10.5M 0.05% 289
2023
Q1 		$93.9M Sell
11,000,547
-695,747
-6% -$5.52M 0.06% 258
2022
Q4 		$77.3M Sell
11,696,294
-64,321
-0.5% -$433K 0.06% 291
2022
Q3 		$87.9M Buy
11,760,615
+8,986,071
+324% +$63.3M 0.07% 253
2022
Q2 		$16M Buy
2,774,544
+19,691
+0.7% +$145K 0.01% 604
2022
Q1 		$22.2M Buy
2,754,853
+862,819
+46% +$7.43M 0.01% 725
2021
Q4 		$19.8M Buy
1,892,034
+822,472
+77% +$8.83M 0.01% 793
2021
Q3 		$10.9M Buy
+1,069,562
New +$10.8M ﹤0.01% 901

Other funds holding MIR

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
CLG
Cooperman Leon G $3.55B AUM 41.85% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return

Janus Henderson Group's MIR Position: Q1 2026 in Review

Janus Henderson Group reduced its Mirion Technologies (MIR) stake by 12% in Q1 2026, selling an estimated $12.5M and leaving 4,043,089 shares worth $75.2M. The position accounts for 0.04% of the portfolio, ranked #333.

Janus Henderson Group first reported a position in MIR in Q3 2021 and has held it in 19 quarters since. The position peaked at $178M in Q3 2025. 362 funds tracked by Wall St. Rank hold MIR as of Q1 2026.

  • Janus Henderson Group held 4,043,089 shares of Mirion Technologies worth $75.2M as of Q1 2026.
  • Janus Henderson Group sold 553,860 Mirion Technologies shares in Q1 2026, an estimated $12.5M.
  • Mirion Technologies made up 0.04% of Janus Henderson Group's portfolio in Q1 2026, its #333 holding.
  • Janus Henderson Group first reported a position in Mirion Technologies in Q3 2021 and has held it in 19 quarters since.
  • Janus Henderson Group's Mirion Technologies position peaked at $178M in Q3 2025.
  • 362 funds tracked by Wall St. Rank held Mirion Technologies as of Q1 2026.

Based on Janus Henderson Group's 13F filing for Q1 2026, filed 15 May 2026.