InfoSum

A leading neutral data collaboration platform and clean room provider, differentiated by its decentralized no-data-movement architecture in the privacy-first AdTech space.

InfoSum is a leading data collaboration platform headquartered in Basingstoke, United Kingdom, founded in 2016 by Brian Lesser and Nick Halstead. The company's core technology is built around a concept called 'data bunkers' — secure, decentralized environments where first-party data is stored locally and never shared or transferred. Instead of moving data, InfoSum uses privacy-enhancing technologies (PETs) including federated learning and statistical matching to allow organizations to derive insights from combined datasets without exposing raw data to any party, including InfoSum itself. In the AdTech ecosystem, InfoSum serves as a critical infrastructure layer for data collaboration between advertisers, publishers, data owners, and platforms. Its platform enables use cases such as audience matching, measurement, identity resolution, and data monetization — all in a privacy-compliant manner that respects GDPR, CCPA, and other global data regulations. The company has established significant partnerships with major media owners, broadcasters, and retail media networks, positioning itself as a neutral, trusted intermediary in a post-cookie, privacy-first advertising landscape. InfoSum has raised substantial venture funding and counts major media companies, retailers, and financial services firms among its clients. The company competes in the rapidly growing clean room and data collaboration space alongside players like Habu, LiveRamp, and Snowflake Data Clean Rooms. InfoSum differentiates itself through its decentralized, no-data-movement architecture, which it argues provides stronger privacy guarantees and greater data owner control than centralized clean room alternatives.