← All S&P MidCap 400 additions
TLN — S&P 400 index addition
Talen Energy
Sector
Unknown
Announced
Aug 28, 2025
Effective
Aug 28, 2025
Replaced
Interactive Brokers
1W after inclusion
-2.0%
-2.7% vs S&P 400
1M after inclusion
+5.9%
+4.3% vs S&P 400
3M after inclusion
+1.1%
-1.1% vs S&P 400
6M after inclusion
-3.3%
-15.0% vs S&P 400
1Y after inclusion
-23.7%
-40.7% vs S&P 400
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: +7.5%
Other stocks added to the S&P MidCap 400
- SUI — Sun Communities joined on Aug 20, 2026.
- KRYS — Krystal Biotech joined on Jul 24, 2026.
- MOH — Molina Healthcare joined on Jul 22, 2026.
- BTSG — BrightSpring Health Services joined on Jul 17, 2026.
- ALSN — Allison Transmission joined on Jul 6, 2026.
- TOST — Toast, Inc. joined on Jul 1, 2026.
See the full S&P MidCap 400 additions log or the index review calendar.