Your agency stops buying media for you and starts selling media to you. It buys inventory up front, or says it does, then resells it to you at one price per unit.
The spread between what it paid and what you pay is its margin. You usually never see the first number.
The upside: access to inventory that’s hard to get, and sometimes better pricing.
The ANA’s March 2026 study found 58% of marketers used principal media in the past year, and 90% worry whether it serves their interests. Both numbers are climbing.
Question: would your agency recommend this placement if it didn’t own it? Before you opt in, get it in writing. Opt in by campaign, cap it by channel and secure audit rights over delivery and quality.
Deep dive:
What is principal media?
Are agencies are boosting profits by flipping ad space? What does it mean for clients?
Travis Lusk
