EY (Ernst and Young) is one of the "Big Four" accounting firms. EY handles auditing and accounting services for the largest public companies in the world as well for numerous private companies. They also handle financial consulting, tax support, and provide transaction advisory services.
With over 90 offices in 50 countries, the Boston Consulting Group (BCG) is one of the world's most prestigious consulting firms. BCG was ranked 4th in Fortune's "100 Best Companies to Work For" in 2018.