Invicta FC has bolstered its roster with the signing of 15 fighters, the all-female promotion announced Thursday. Among the signings are former UFC fighters Pearl Gonzalez and Sarah Kaufman to the strawweight and bantamweight divisions, respectively, as well as others signed at flyweight and atomweight. Gonzalez (6-3) joins Invicta after a two-fight UFC run in which she lost both times, most recently a unanimous decision to Poliana Botelho in October at UFC 216