Fiserv is a provider of technology solutions to the financial world, including banks, credit unions, securities processing organizations, insurance companies, finance companies and mortgage banks.

Where they're located: Nashville, Tennessee, USA

3. unknown

CFS is a leading, employee-owned staffing firm founded by CPA firms — and powered by entrepreneurs. Find a job or talent now.

Where they're located: Nashville, Tennessee, USA

4. FTS US Inc.: A professional tax and accounting firm in Greenwich, Connecticut: Home

5. Tech Financial Services

6. Chantico Technology

How much they make:

7. Hendricks Holding Company

Hendricks Holding Co., Inc. founded in 2001, is an investment and corporate development group with a diverse portfolio of businesses that span the globe.