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MIR — S&P 600 index addition
Mirion Technologies
Sector
Unknown
Announced
Sep 9, 2025
Effective
Sep 9, 2025
Replaced
GMS, Inc.
1W after inclusion
+8.3%
+7.8% vs index
1M after inclusion
+5.8%
+4.5% vs index
3M after inclusion
+14.4%
+11.7% vs index
6M after inclusion
-7.1%
-17.8% vs index
1Y after inclusion
-24.8%
-47.7% vs index
Indexed performance around the effective date (effective close = 100)
Prices last updated: 2026-09-16 06:30 UTC (9h ago)
Run-up in the 30 days into inclusion: +5.1%
Other stocks added to the S&P SmallCap 600
- ADIG — ADI Global Distribution joined on Aug 4, 2026.
- FIVN — Five9 joined on Aug 3, 2026.
- VVX — V2X, Inc. joined on Jul 27, 2026.
- TPC — Tutor Perini joined on Jul 24, 2026.
- ROAD — Construction Partners joined on Jul 22, 2026.
- KRMN — Karman Holdings joined on Jul 17, 2026.
See the full S&P SmallCap 600 additions log or the index review calendar.