Profits for the Teachers Insurance and Annuity Association, which manages retirement accounts and mutual funds, and sells insurance plans, jumped 26% in 2015. A big boost came from its acquisition of Nuveen investments the year before. The organization has won accolades for the best-in-class investment performance of its funds, which has helped attract more customers and management fees. TIAA has also expanded its offerings in other types of investment classes such as real estate, agriculture, and timber. Sales increased nearly 3% in 2015, helping to push it up 10 spots on the Fortune 500, to No. 82.