Built with a Different DNA

Auction Runs in


Empowered Marketplaces


Delighted Advertisers


Countries Supported


How it started?

Francisco came from Chile to Stanford for an MBA. He took a marketplace design class with Michael and kept in touch for years after. Regina started a DTC brand in school and ended up selling most of the products through retail and online advertising was a hard puzzle she could not understand. Through random chances of life and its events - the three met. Regina being a former small vendor with need for diverse advertising tools, Francisco an engineer that builds systems at scale, and Michael the brilliant economist with faith in simple product designs - decided to start a company together.

After two weeks of running excel spreadsheets full of naming ideas where the three went through many combinations of names - they settled on Topsort as the company name and started working (finally)!

message thread about how topsort was found
regina ye - topsort ceo

Regina Ye

Cofounder and CEO

Regina is a classic Gen-Z entrepreneur who secretly wishes she can just be a full-time food blogger. She studied computer science and philosophy (fun fact she read all the books written by Plato and Aristotle at the age of 16 in New Mexico’s high deserts) and started an ecommerce company Zirui in college. She later decided to embark on a career as in Product Management and found herself back to her entrepreneurial itch.

Francisco Larrain

Cofounder and CTO

Francisco, a son of a single mom who grew up Jewish in a Catholic society in Chile and found engineering a safe haven and also a fun game to obsess with. He is the first Chilean entrepreneur to exit a startup to Silicon Valley. Formerly a hedge fund analyst, he led engineering at Groupon for 5 years to build out its merchant system. He was a venture investor and now spends all of his time thinking about Topsort’s engineering puzzles.

Francisco Larrain - Topsort CTO
Michael Ostrovsky - Topsort Chief Scientist

Michael Ostrovsky

Cofounder and Chief Scientist

Mike, a math genius as the movie goes - a beautiful mind. He won the international math olympiad gold medal as a teenager with a perfect score and then gained his PHD at Harvard to quickly turn tenure as a professor at Stanford Graduate School of Business. He did economic research with Nobel Prize Laureates such as Paul Milgrom and Alvin Roth, and wrote the paper that built the foundation for Internet Advertising and Generalized Second Price Auction. Over the past 2 decades he’s worked with the best names in advertising and tech, from Yahoo to Google, to Linkedin and Pinterest and he believes firmly in the power of simplification and how auction-based advertising can work in much simpler and long-tail marketplaces.

Global Team
with a Local Approach

Topsort is revolutionizing the ad infrastructure landscape as a leading provider of AI-driven, auction-based media monetization platforms and APIs. Exceptional technology is built by exceptional human beings.

A Team That Cares

Thank you very much for all the effort. The implementation of the Topsort API was very good, thanks for all the support. It was actually a really simple implementation, Thank you!

Erik Alanis
Software Engineer at Falabella

A Team That Knows

Topsort’s auction engine is designed from the ground up to incorporate the advances in ad auctions while keeping the system simple for advertisers to use and for marketplaces to deploy

Michael Ostrovsky
Cofounder and Chief Scientist

A Team That Laughs

I grew up believing that there were no dinosaurs in Chile. Boy, I was wrong

Felipe Contreras
Software Engineer at Topsort

Building The Next Generation
of Advertising Tools
Yahoo pioneered fixed placements and the original ad unit sales.
Google started using auctions to sell off some side placements, that eventually took over and became Google Adwords.
Amazon started the endeavor on ads which now makes more than 31 Billion dollars a year.

Simple product with a universal approach - advertising that’s intuitive, accessible, and clean

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