Baker & McKenzie, an international firm founded in Chicago, would regain its mantle as the world’s largest law firm by attorney head count if rumors about its possible merger with Heller Ehrman were to materialize.

Baker last year lost its place as the largest firm when it was surpassed by crosstown Chicago rival DLA Piper, which has about 3,600 full-time lawyers. A combination with Heller would give Baker, which has about 3,300 full-time lawyers, another 650, vaulting it to the top slot once again with about 4,000 attorneys worldwide.