Enables insulin-like growth factor I binding activity and insulin-like growth factor II binding activity. Predicted to be involved in cell migration; positive regulation of stress-activated MAPK cascade; and regulation of insulin-like growth factor receptor signaling pathway. Located in Golgi apparatus and extracellular space. Human ortholog(s) of this gene implicated in obesity. Orthologous to human IGFBP6 (insulin like growth factor binding protein 6). [provided by Alliance of Genome Resources, Apr 2022]