Adva Optical Netwo (NASDAQ:ADVOF) was upgraded by Zacks Investment Research from a “sell” rating to a “hold” rating in a research note issued to investors on Wednesday.

According to Zacks, “ADVA Optical Networking SE develops, manufactures and sells optical and Ethernetbased networking solutions. It serves telecommunications service providers, private companies, universities and government agencies. ADVA Optical Networking SE is headquartered in Munich, Germany. “

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