Receptor for hyaluronic acid (HA) (By similarity). Involved in cell motility (By similarity). When hyaluronan binds to HMMR, the phosphorylation of a number of proteins, including PTK2/FAK1 occurs. May also be involved in cellular transformation and metastasis formation, and in regulating extracellular-regulated kinase (ERK) activity. May act as a regulator of adipogenisis (By similarity). Interacts with ANKRD26 (PubMed:22666460). Interacts with DYNLL1 (PubMed:22965910). Interacts with FAM83D/CHICA (PubMed:22965910). Expressed in testis (PubMed:22965910). Expressed in the breast (PubMed:8890751).