Aurora Spine Corp (AROSF: Pink Current) | Tier Change Fri, Nov 13, 2020 12:00 - Aurora Spine Corp ( AROSF : Pink Current) - Tier Change - The symbol, AROSF, no longer is classified as Grey Market. As of Fri, Nov 13, 2020, AROSF resides in the Pink Current tier. You may find a complete list of tier changes at otcmarkets.com .