Ad-Stacking

Ad stacking is a type of ad fraud where multiple ads are layered in the same placement, with only the top one visible.

It’s a deceptive technique used by malicious publishers to inflate impression counts by placing several ads in one slot—often hidden underneath the top visible ad.

It leads to wasted spend, poor UX, and inaccurate attribution, violating most ad platform policies.

Fraud audits, viewability reports, SDK monitoring, MMP anomaly tracking.

• Use ad verification tools, monitor impression-to-view ratios, avoid suspicious networks or exchanges.