Cien to buy Cyan By: MarketMinute.com Stock News May 04, 2015 at 13:56 PM EDT Cien Corp. (NYSE: CIEN) will purchase Cyan Inc. (NYSE: CYNI) in a transaction valued at approximately $400 million. Shares of Cien rose 29 cents to $21.58 while Cyan stock soared $1.01 to $4.66. Related Stocks: Ciena Corp