(Reuters) – The S&P Dow Jones Indices said on Friday server maker Dell Technologies (NYSE:DELL), data analytics firm Palantir Technologies (NYSE:PLTR) and property and casualty insurer Erie Indemnity will join the benchmark S&P 500 before the market opens on Sept. 23.
Shares of Palantir rose nearly 8% in extended trading, while those of Dell and Erie rose 6% and 3%, respectively.
The three companies will replace American Airlines (NASDAQ:AAL) Group, online marketplace Etsy (NASDAQ:ETSY) and diagnostics company Bio-Rad Laboratories (NYSE:BIO) in the index.
Shares of American Airlines were down 0.7%, while those of Bio-Rad Laboratories and Etsy fell about 1%.
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