Topsort is a retail media infrastructure company founded in 2021. It empowers marketplaces, retailers, and brands to create and optimize their advertising businesses using advanced AI-driven technology. Topsort aims to make sophisticated, auction-based advertising accessible to a wide range of clients globally.

The company provides a suite of tools and APIs for launching and managing various advertising formats, including sponsored listings, display ads, and native ads. Their platform operates on privacy-first principles, utilizing product information for ad targeting instead of third-party cookies, which they refer to as "Clean Ads." This approach fosters a transparent advertising ecosystem for consumers and advertisers alike.

Topsort's core technology features a powerful AI-driven auction engine that optimizes ad placements in real-time. Their flexible, API-first infrastructure allows for seamless integration with existing e-commerce platforms, offering customizable solutions. Topsort serves clients in over 40 countries, including notable companies like Poshmark and Glovo, helping them drive sales and growth through effective advertising solutions. The company has offices in Boston and San Francisco and supports a hybrid work environment.