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AMTM — S&P 600 index addition
Amentum
Sector
Unknown
Announced
Dec 23, 2024
Effective
Dec 23, 2024
Replaced
Service Properties Trust
1W after inclusion
+11.7%
+13.7% vs index
1M after inclusion
+15.8%
+17.3% vs index
3M after inclusion
-8.3%
+1.7% vs index
6M after inclusion
+9.4%
+16.6% vs index
1Y after inclusion
+47.5%
+43.6% 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: -18.3%
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.