Recently, the job and recruiting website Glassdoor released their list of the '50 Best Places to Work in 2016' based off employee feedback about their company. While the list serves as a great guide for professionals looking to switch jobs in the new year, one major criteria that has proven to drive growth in business seemed to be missing. [RELATED: [Dec 2014/Jan 2015] 40 Best Companies For Diversity] Diversity has proven time and time again to be one of the key factors that help a company thrive. According to a 2015 McKinsey & Co. study, companies that are racially and ethnically diverse and gender-diverse are 35% and 15% more likely, respectively, to outperform those that don't make such a commitment. That's why for 10 years straight, Black Enterprise has compiled their list of the best companies for diversity. [RELATED: Airbnb, Hubspot and Facebook Announced As Best Places to Work in 2016] Sending surveys to 1,000 of the largest publicly-traded companies, Black Enterprise evaluated survey participants based off the following practices: representation of African Americans in senior positions, number of African Americans and other ethnic minorities on corporate board, total spending power with African American suppliers and percentage of African Americans within the employee base. Using these components, a list of the '40 Best Companies for Diversity' was compiled with four of the companies having a black CEO. It was also found that a total of 59 black female professionals hold senior management positions across these companies and a total of 72 black professionals are board members. To find out which companies made the top 20 for best diversity practices, see the list below. 1. Exelon Corp., Chicago, IL Strengths: Employee Base, Senior Management, Board of Directors, Supplier Diversity 2. Aflac Inc., Columbus, GA Strengths: Employee Base, Senior Management, Board of Directors 3. The Coca-Cola Co., Atlanta, GA Strengths: Senior Management, Board of Directors, Supplier Diversity 4. Consolidated Edison Inc., New York, NY Strengths: Employee Base, Senior Management, Board of Directors 5. Fannie Mae, Washington, D.C. Strengths: Employee Base, Senior Management, Board of Directors 6. IBM Corp., Armonk, NY Strengths: Senior Management, Board of Directors, Supplier Diversity 7. McDonald's Corp., Oak Brook, IL Strengths: Employee Base, Senior Management, Board of Directors 8. MGM Resorts International, Las Vegas, NV Strengths: Employee Base, Senior Management, Board of Directors 9. American Express Co., New York, NY Strengths: Senior Management, Board of Directors 10. AT&T Inc., Dallas, TX Strengths: Senior Management, Supplier Diversty (Continued on next page) 11. Duke Energy Corp., Charlotte, NC Strengths: Employee Base, Senior Management 12. Entergy Corp., New Orleans, LA Strengths: Employee Base, Senior Management 13. FedEx Corp., Memphis, TN Strengths: Senior Management, Board of Directors 14. Ford Motor Co., Dearborn, MI Strengths: Senior Management, Supplier Diversity 15. Freddie Mac, McLean, VA Strengths: Board of Directors, Supplier Diversity 16. General Mills Inc., Minneapolis, MN Strengths: Senior Management, Board of Directors 17. Johnson Controls Inc., Milwaukee, MN Strengths: Employee Base, Supplier Diversity 18. Marriott International Inc., Bethesda, MD Strengths: Board of Directors, Supplier Diversity 19. Merck & Co. Inc., Kenilworth, NJ Strengths: Senior Management, Board of Directors 20. Nationwide Insurance Co., Columbus, OH Strengths: Senior Management, Board of Directors