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Ciena Rejoins S&P 500 After 17-Year Hiatus

2/5/2026

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Summary

Story summary

Ciena Corporation will rejoin the S&P 500 after 17 years, replacing Dayforce, acquired by Thoma Bravo for $12.3 billion.
Ciena's stock rose after-hours on the news, reaching a 2001 high.
In 2025, 18% of revenue came from a cloud provider and 11% from AT&T.
The market cap nearly tripled in the past year due to AI-driven demand, and CEO Gary Smith projects 24% revenue growth for 2026.

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Story summary

Ciena Corporation will rejoin the S&P 500 after 17 years, replacing Dayforce, acquired by Thoma Bravo for $12.3 billion.
Ciena's stock rose after-hours on the news, reaching a 2001 high.
In 2025, 18% of revenue came from a cloud provider and 11% from AT&T.
The market cap nearly tripled in the past year due to AI-driven demand, and CEO Gary Smith projects 24% revenue growth for 2026.