Lassie has raised $35 million in a Series A led by Andreessen Horowitz, bringing its total funding to $47 million.
Co-founders Steijn Pelle and Frédéric Renken spent months working inside a dental practice by hand before writing a single line of code.
The company now operates in 700+ practices across 49 states and saves owners over 250,000 hours of administrative work each year.
When Steijn Pelle’s dentist showed him what it actually takes to run a dental practice, he didn’t go back to his laptop and start building. He pulled up a bar stool in the back office and spent months processing insurance claims and reconciling payments by hand. That experience — working inside Dr. Kwon’s Bay Area practice — shaped every product decision that followed at Lassie.
San Francisco-based Lassie announced it has raised $35 million in Series A financing, bringing its total capital raised to $47 million. The round was led by Andreessen Horowitz, which closed a $15 billion mega-fund in January 2026 with a stated thesis of backing AI companies that replace operational drag. The round also drew support from Night Capital, Rahul Vohra (founder and former CEO of Superhuman), Zach Perret (co-founder and CEO of Plaid, valued at $8 billion in its most recent secondary), Taavet Hinrikus (co-founder and former CEO of Wise), Gokul Rajaram, and Brian Balfour (co-founder and CEO of Reforge).
