Match Rate Is the Ad Metric You're Secretly Losing on—and It's Costing You Millions
TLDR
Most advertisers ignore match rate—the percentage of their audience a platform can recognize—and unknowingly run campaigns at a fraction of their intended reach.
Search Engine Land breaks down why match rate, the share of an uploaded audience that platforms like Google and Meta can actually recognize and target, has become critical as third-party cookies disappear and identity signals fragment. The article explains how campaigns silently run against only 40–60% of uploaded lists while metrics still look healthy, then shows how CKE Restaurants improved ROAS on the same spend by enriching identifiers through Rokt mParticle's Match Boost, demonstrating that the efficiency gains come from removing invisible waste rather than changing strategy.