Flatiron Health
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Investors
Founders
About
Flatiron Health is an oncology-focused health technology company founded in 2012 in New York City by Nat Turner and Zach Weinberg, who previously co-founded Invite Media (acquired by Google in 2010) 12. The company built the first cloud-based oncology data platform, integrating cancer center data systems to provide longitudinal patient population views and enable clinical and business analytics 1. Flatiron’s OncologyCloud platform included OncoEMR (electronic health record), OncoAnalytics (advanced analytics), OncoBilling (practice management), and SeeYourChart (patient portal) 3. By 2016, Flatiron partnered with over 265 community cancer clinics and five major academic research centers 3. Roche acquired the company in April 2018 for approximately $1.9 billion, building on an existing 12.6% equity stake from its Series C lead investment 45. The company raised a total of approximately $313 million across three rounds prior to the acquisition 123.
Funding History
| Round | Date | Amount | Lead Investor(s) | Key Co-Investors |
|---|---|---|---|---|
| Series A | Jan 2013 | $8M | Google Ventures (GV) | First Round Capital, LabCorp, Great Oaks Capital, Social+Capital Partnership, SV Angel, IA Ventures 1 |
| Series B | May 2014 | $130M | Google Ventures (GV) | First Round Capital, LabCorp 26 |
| Series C | Jan 2016 | $175M | Roche | Allen & Company, Baillie Gifford, Casdin Capital 3 |
| Acquisition | Apr 2018 | $1.9B | Roche | — 45 |
What Investors Say
Dr. Krishna Yeshwant, Google Ventures Partner, on the Series A: “Oncology is one of the fastest growing segments of the health care industry, and oncologists and researchers need new and advanced tools to keep up.” 1
Dr. Krishna Yeshwant on the Series B: “They are working on one of the biggest problems in healthcare, and their progress has been nothing short of stunning to date.” 2
Daniel O’Day, COO of Roche Pharmaceuticals, on the Series C: “This partnership will generate valuable insights to shape progress in both the development of new medicines and the way those medicines are made available to patients.” 3
Daniel O’Day on the acquisition: “This is an important step in our personalised healthcare strategy for Roche, as we believe that regulatory-grade real-world evidence is a key ingredient to accelerate the development of, and access to, new cancer treatments.” 4
What Founders Say
Nat Turner on building Flatiron Health (Series A announcement): “Solving the big data problem in oncology is going to take much more than money, and we’re honored to be working with a group of firms and individuals who genuinely care.” 1
Nat Turner on the Series B: “Flatiron will be a critical component to truly personalizing medicine by enabling the right patient to get the right therapy at the right time.” 2
Zach Weinberg on the Roche partnership (Series C): “The collaboration with Roche will provide us with a unique opportunity to further advance clinical research and real-world evidence.” 3
Nat Turner on the Roche acquisition: “Roche has been a tremendous partner to us over the past two years and shares our vision for building a learning healthcare platform in oncology.” 4
Sources
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Flatiron Health press release, “Flatiron Health Raises $8 Million from Google Ventures, First Round Capital and LabCorp,” January 2013, accessed March 2026. https://resources.flatiron.com/press/press-release/flatiron-health-raises-8-million-from-google-ventures-first-round-capital-and-labcorp↩↩↩↩↩↩
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Flatiron Health press release, “Flatiron Health Raises $130 Million Series B Round Led by Google Ventures,” May 2014, accessed March 2026. https://resources.flatiron.com/press/press-release/flatiron-health-raises-130-million-series-b-round-led-by-google-ventures-and-agrees-to-acquire-leading-cloud-based-emr-company-altos-solutions↩↩↩↩↩
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Flatiron Health press release, “Flatiron Health Raises $175 Million Series C Round,” January 2016, accessed March 2026. https://resources.flatiron.com/press/flatiron-health-raises-175-million-series-c-round-to-further-bolster-its-oncologycloud-software-platform-for-providers-and-accelerate-personalized-m↩↩↩↩↩↩
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Roche media release, “Roche to acquire Flatiron Health to accelerate industry-wide development and delivery of breakthrough medicines for patients with cancer,” February 15, 2018, accessed March 2026. https://www.roche.com/media/releases/med-cor-2018-02-15↩↩↩↩
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BioPharma Dive, “Roche buys cancer data company Flatiron Health for $1.9B,” 2018, accessed March 2026. https://www.biopharmadive.com/news/roche-buys-cancer-data-company-flatiron-health-for-19b/517285/↩↩
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TechCrunch, “Google Ventures Leads $130M Series B In Cancer Data Startup Flatiron Health,” May 7, 2014, accessed March 2026. https://techcrunch.com/2014/05/07/google-ventures-leads-130m-series-b-in-cancer-data-startup-flatiron-health/↩