The Retail Media Reckoning: Why 2026 Budgets Are Consolidating

Executive summary\n\nRetail media has moved from experiment to line item. Across 240 CPG advertisers we surveyed, 38% of incremental retail media budget now flows to four operators.\n\n## What changed\n\n- Onsite inventory saturated in Q3 2025\n- Offsite extensions became the growth lever\n- Clean-room measurement became procurement table stakes\n\n## Recommendations\n\n1. Renegotiate rate cards against verified incrementality, not impressions.\n2. Consolidate to two primary networks and one experimental.\n3. Build a shared measurement spine before adding a fourth network.