Ciena returns to S&P 500 after getting booted 17 years ago

How Caterpillar (CAT) Became the Best-Performing Stock on the Dow Jones

The largest decline since April of last year, Nasdaq's 'two consecutive drops': Software 'on fire', chips 'hit hard', and technology 'plummeting'.

This AI stock is the newest member of the S&P 500

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