Natalie Aresta-Katz built Regbase, turning a painstaking Big Law research problem into a global regulatory-tracking platform

Regbase is an AI-native regulatory intelligence and legal research platform that automatically tracks, analyzes, and sends updates on new or proposed laws, draft bills, consultations, and funding opportunities across global, federal, state, and local jurisdictions.

Regbase has been covered extensively in business and legal press. Recently, Poets & Quants featured Natalie Aresta-Katz and her new AI-based regulatory platform. “I didn’t realize that the gender ratio at YC (and in AI more broadly) is actually getting worse, not better,” she tells Poets&Quants." Read the rest of this story by Ps&Qs' Kristy Bleizeffer.

Before founding Regbase, Natalie was a regulatory researcher at Paul, Weiss, where she supported one of the firm's largest multinational clients. When the team needed to track new legislation across 45 countries simultaneously, no tool could do it. They resorted to manual searches and retaining local counsel in each jurisdiction. Regbase was built to solve exactly that problem, catching the developments that tools like Legora, ChatGPT, Harvey, and even local counsel consistently miss.

Previously an ESG regulatory researcher at Paul Weiss and a recent Columbia Business School (CBS) MBA grad, Natalie is co-founder of Regbase, an AI-native legal research platform that helps companies, law firms, researchers, and government vendors track new and proposed laws across countries, languages, and jurisdictions. Those include regulations buried on obscure government websites, consultation portals, social media pages, and other sources that traditional search engines and large language models may never index. 

Regbase was accepted into Y Combinator’s Spring 2026 batch, making Aresta-Katz the first current CBS student admitted to the accelerator since 2019. She was also one of just 18 women among the batch’s 431 founders, perhaps one of the biggest surprises of her journey so far.

Listen to Natalie's interview with Fondo here: https://youtu.be/oqJSvDoauks.