Oliver Leigh

Co-Founder & CEO Portal

Oliver Leigh is Co Founder and CEO of Portal, the analytics platform that helps consumer brands understand what happens after a shopper clicks a retail media advert. Working with global brands including L'Oreal, Beiersdorf, Karo Healthcare, Kenvue and Coca-Cola, Portal sits between the consumer and the retail environment, capturing rich session data relating to brand owned offsite media and feeding data into a proprietary conversion probability model. This gives marketers a clearer, more defensible view of onsite performance across major retailer websites, closing the offsite media measurement gap that has long left post click activity opaque.

Oliver founded Portal to bring the same rigour to retail media that marketers expect elsewhere in their media mix, and continues to lead the company's product and commercial direction.

At Groceryshop 2026 in Las Vegas, Oliver will present Portal's approach to measuring offsite retail media, making the case for brands to demand more accountability from their retail media spend. He will also cover how retailers can benefit from Portal's infrastructure, and what both sides need from analytics to keep pace with the category's growth.