PLTR, DELL rally on news of replacing American Airlines, Etsy in S&P 500: Here's how the index makes its calls
Briefly

Shares of Palantir Technologies and Dell Technologies are rallying in reaction to their inclusion in the S&P 500, reflecting positive investor sentiment and market anticipation.
The decision to add Palantir and Dell is part of a quarterly rebalancing of the S&P 500, with criteria including market capitalization and share float sufficient for public trading.
Companies are removed from the S&P 500 typically due to significant changes in their core business or major corporate actions, ensuring the index reflects current market dynamics.
Joining the S&P 500 boosts a company’s visibility and often its stock price, as seen by the immediate 13% rise in Palantir’s shares.
Read at Fast Company
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