Norges Bank acquired additional 0.47% stake in ADVA Optical Networking SE (XTRA:ADV) on December 30, 2016. Under the terms of the deal, Norges Bank increased its stake to 3.31%. Norges Bank completed the acquisition of additional 0.47% stake in ADVA Optical Networking SE (XTRA:ADV) on December 30, 2016.