mar ‧ ket ‧ mak ‧ er /ˈmɑːkətˌmeɪkə, ˈmɑːkɪtˌmeɪkə $ ˈmɑːrkətˌmeɪkər/ BrE AmE noun [countable] British English technical
an organization such as a bank or a ↑ broker who keeps a supply of ↑ stock s and ↑ share s available for people who want to buy them