To find out which companies are the best for HR management, the research team created a statistical formula to shift through publicly available data on HR performance to separate the best from the rest. This year, to give employees more of a “say,” we’ve asked recruiting and job review website Glassdoor Inc. to provide data on what workers are saying about the companies that made our short list. From there, we combined that information with the public data available to create our 2016 Workforce 100 list. American Express Inc. was the top company on this year’s list, and it has made the list all three years. Thirty-three other companies have also made all of the lists.