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History Says the S&P 400 and 600 Indexes Could Be Poised to Soar

Over the last three and five years, large-cap stocks have outperformed small- and mid-cap stocks. The gap between the forward P/Es of the S&P 500 index and the S&P 400 and 600 indexes hasn't been this ...
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S&P rebalancing: Pinterest enters S&P 400; Under Armour drops to small-cap index

S&P Dow Jones Indices on Friday announced multiple index changes effective Dec. 22. As part of the rebalancing, Pinterest (PINS) will join the S&P MidCap 400 index (SP400), alongside Booz Allen ...
Investopedia

Instacart Is Joining the S&P MidCap 400. Its Stock Is Rising.

Instacart's stock rose on the news that it would join the S&P MidCap 400 index. The change, set for next week, will pair with the removal of Enovis, which is moving to the SmallCap 600. Instacart's ...
24/7 Wall St

Solstice Advanced Materials and SiTime Join the S&P MidCap 400 As AI Stocks Reshuffle the Index

The S&P MidCap 400 has more than $100 billion of assets following it and added SiTime (SITM) and Solstice Advanced Materials (SOLS) tonight. The additions of Solstice Advanced Materials and SiTime ...
Business Wire

Hecla Mining Company to Join S&P MidCap 400 Index

COEUR D'ALENE, Idaho--(BUSINESS WIRE)--Hecla Mining Company (NYSE: HL) today announced that it will be added to the S&P MidCap 400 Index, effective prior to the open of trading on December 22, 2025, ...