On the morning of June 5, 2025, the digital-health world watched a fourteen-year-old startup ring the Nasdaq opening bell. The ticker said OMDA. The man holding the gavel was Sean Duffy, who once owned a Harvard Medical School ID badge and gave it back.
Omada Health priced its IPO at $19 a share, square in the middle of its expected range, and stepped onto the public markets with roughly 850 employees behind it. In a category where companies hit the bell young, brassy, and unprofitable, Duffy did the unfashionable thing. He waited. "Today is the right moment for us," he told CNBC the morning after, which is a CEO sentence and also a fourteen-year sentence.
What Omada sells is not exactly software. It is not exactly a clinic. It is a virtual-first care model for people living with chronic conditions, built around the unsexy thesis that healthcare needs to follow patients home. That thesis - and the company - was born in a coworking office above a Chinatown dim sum joint, where Rock Health's first cohort of digital-health hopefuls were squeezed onto folding tables.
Duffy was 26. He had a neuroscience degree from Columbia, a stint at Google, an internship at IDEO, and a half-finished joint MD/MBA from Harvard. The half-finished part is the part he likes to talk about.
While interning at IDEO between his first and second years of medical school, Duffy read about the Diabetes Prevention Program, a 2002 clinical trial that quietly proved something stunning: structured lifestyle change could cut a high-risk patient's chance of developing type 2 diabetes by more than half. The trial was a decade old. Almost no one had figured out how to deliver it at scale. Duffy thought he saw a way. He went back to Boston, finished the year, and then in 2011 wrote the email no parent of a Harvard medical student wants to read.
He co-founded Omada Health that spring with Adrian James, a designer he had met at IDEO, and Andrew DiMichele, an engineer. The three split equity, set up shop in San Francisco, and started building. James and DiMichele have since moved on to other ventures. Duffy stayed.
He has been the only CEO Omada has ever had.
