Form Type:  DEFA14A
Filing Date:  6/12/2019 
CIK:  0001453814 
Address:  350 HUDSON ST., 9TH FLOOR 
City, State, Zip:  NEW YORK, New York 10014 
Telephone:  212.918.1800 
Fiscal Year:  12/31 
Description of Business
Medidata is a global life sciences technology provider, dedicated to improving the way clinical research is designed, conducted, analyzed, and commercialized. Our cloud-based platform of solutions, data analytics, and AI enables efficiency and improves quality throughout clinical development programs by accelerating processes, enhancing decision-making, minimizing operational risk, reducing costs, and transforming trial strategies. Customers can utilize our entire platform or individual solutions, and can subscribe to our technology on a multi-study or single-study basis. Our revenue is comprised of subscription and professional services, which represent approximately 85% and 15% of our business, respectively. Our subscription business model provides us with a recurring revenue stream that we believe delivers greater revenue visibility than perpetual software licensing models.
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    Item 8.01. Other Events.
  EXHIBIT 99.1