Provided herein are solid forms comprising {[5-(3-chlorophenyl)-3-hydroxypyridine-2- carbonyl]amino}acetic acid, compositions comprising the solid forms, methods of making the solid forms and methods of their use for the treatment of various diseases and/or disorders.本發明提供包含{[5-(3-氯苯基)-3-羥基吡啶-2-羰基]胺基}乙酸之固體型式、包含該等固體型式之組合物、製備該等固體型式之方法及其用於治療多種疾病及/或病症之方法。