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ACHC — S&P 600 index addition
Acadia Healthcare
Sector
Unknown
Announced
Sep 22, 2025
Effective
Sep 22, 2025
Replaced
Techtarget
1W after inclusion
+6.6%
+6.1% vs index
1M after inclusion
+1.9%
+1.9% vs index
3M after inclusion
-37.4%
-39.8% vs index
6M after inclusion
-1.3%
-9.0% vs index
1Y after inclusion
—
window not elapsed
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: +2.6%
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.