Sema4 shells out $623M to scoop up a leading diagnostics player and its trove of data
Sema4 sees a future where precision medicine is the standard of care, and genetic testing is the key to getting there. That’s where GeneDx comes in.

The Stamford, CT-based AI company is putting down up to $623 million to buy out GeneDx, a subsidiary of the diagnostics company OPKO Health. After the deal closes next quarter, Sema4 chief Eric Schadt and GeneDx head Katherine Stueland will team up as co-CEOs, aiming to serve both patients and pharma partners with machine learning and genomic testing technology.
“Eric and I had our first coffee a few months ago, and it was like, everything was so complimentary,” Stueland told Endpoints News. “I think this structure enables Eric and I, we both get to work in our respective areas where we have strength.”

While Stueland focuses on the diagnostics business and overall operational success, Schadt will turn his attention to the overarching data strategy, as well as opportunities to serve health systems and drug developers. The plans have piqued interest from a slate of investors — including Pfizer — who pitched into a $200 million private placement that will close concurrently with the buyout next quarter.
“I think we have, as a company and as a culture, always started with data as a primary capability that we want to build over time,” Sema4 CFO Isaac Ro said. “I think as we look at the next few years, it is highly likely that any company in this space is going to need to have excellent NGS lab capability as a primary asset.”
Sema4 sees a variety of uses for its tech platform, from matching patients to the most effective treatments, to identifying and prioritizing drug targets for development. In the last few years, it has worked with a suite of Big Pharma players, including Sanofi, GlaxoSmithKline, Eli Lilly and J&J’s Janssen.
Meanwhile, GeneDx has become a leader in genomic testing since it was founded in 2000 by two NIH scientists. It’s bringing more than 300,000 clinical exomes and 2.1 million annotated phenotypes to strengthen Sema4’s trove of data.

“I think this transaction is going to accelerate that family of relationships while also opening the door for a number of new ones,” Ro said. “And there’s no question, as Eric pointed out, that rare disease in particular is an extremely important area of drug development where we together will have a much stronger franchise.”
Sema4 is shelling out $150 million in cash plus 80 million shares upfront, and potentially another $150 million in revenue-based milestones over the next two years. Altogether, the upfront payment is worth about $473 million.
“Even today, just the thought of NGS testing is still a bit of a novel thing,” Ro said. “This is where you know, GeneDx is so compelling, because they’ve really — and I would say a little bit quietly — developed what we think is the best-in-class solution for that.”