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

In this article

Networking hardware maker Ciena

will join the S&P 500, returning to the benchmark after getting booted 17 years ago. The stock rose in extended trading.

Ciena is replacing human resources software company Dayforce, S&P Dow Jones Indices said in a statement on Wednesday. Private equity firm Thoma Bravo acquired Dayforce for $12.3 billion.

Ciena sells a variety of products for high-speed fiber optical networks. Nearly 18% of revenue in the 2025 fiscal year came from an unnamed cloud provider, and about 11% came from AT&T