NEW YORK – September 30, 2026 -- Eighty-six percent of advertisers say slow audience fulfillment could cause them to cut spending or abandon a retail media network partner, according to GrowthLoop's 2026 Commerce Media Investment Index. The study, conducted with Ascend2, surveyed nearly 300 U.S. and Canadian marketing professionals involved in retail media network (RMN) or commerce media network (CMN) advertising decisions.