The present invention relates to a stabilizer composition comprising a phenolic antioxidant and/or a processing stabilizer together with selected glycidyl(meth)acrylate copolymers and a filled thermoplastic polymer, in particular a nanocomposite. Further aspects of the invention are a process for the stabilization of filled thermoplastic polymers, in particular nanocomposites with a phenolic antioxidant and/or a processing stabilizer together with selected glycidyl(meth)acrylate copolymers and the use of such a composition for the stabilization of filled thermoplastic polymers, in particular nano-composites.