This document summarizes the top 10 physician practice vendors in 2016 based on the number of EHR attestations per 2015 ONC reports. For each vendor, it provides their history, product lines, employee and client statistics, ratings, and future prospects. The top vendor was Epic, followed by Allscripts, eCW, NextGen, GE Healthcare, Greenway, Cerner, Practice Fusion, athenahealth, and McKesson. The summary highlights each vendor's founding, products, size, customer base, ratings, and potential future opportunities and challenges.