ROLLING MEADOWS, Ill., July 1, 2024 /PRNewswire/ -- Arthur J. Gallagher & Co. today announced the acquisition of Rancho Cucamonga, California-based Cornerstone Commercial & Personal Insurance Services, Inc. (Cornerstone). Terms of the transaction were not disclosed. Cornerstone is a retail insurance agency serving commercial and personal clients primarily in San Bernardino and Riverside counties, with a focus on commercial real estate, construction and homeowners associations. Phil Hakopian, Allison Hakopia ...