
American Airlines (AAL), Etsy (ETSY) and Bio-Rad Laboratories (BIO) will be dropped from the S&P 500 later this month to be replaced by Palantir Technologies (PLTR), Dell Technologies (DELL) and Erie Indemnity (ERIE).
Shares in the latter three companies popped on the news Monday, but it remains to be seen whether they're buys beyond the initial catalyst of being tapped to join the most widely tracked equity index.