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

Gary Smith, chief executive officer and president of Ciena Corp., speaks during a Bloomberg Television interview in New York on June 14, 2013.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 produc ...