Pixalate's Seller Trust Indexes (STIs) are the worldwide programmatic advertising quality ratings standards. The indexes evaluate and rank the quality and integrity of key sellers in the programmatic supply chain across channels, platforms, and devices. The CTV STI rankings are based on various seller factors, including invalid traffic (IVT), household reach, server-side ad insertion (SSAI) transparency, and spoofing. Top Supply Side Platforms (SSPs) for Global CTV Programmatic Advertising in Q1 2024 Here are the top five global programmatic sellers of CTV advertising inventory based on overall quality in Q1 2024 by device: Roku OpenX has ranked in the top three for three consecutive quarters. Pixalate's CTV Seller Trust Index – Roku has the full rankings (25 Supply-Side Platforms ranked in Q1 2024).