15. Unum Group
> U.S. pre-tax income: $923 million
> Federal income tax (including rebates): -$98 million
> Effective tax rate: -10.7%
> Industry: Financial

Source: hapabapa / iStock Editorial via Getty Images
14. Fiserv
> U.S. pre-tax income: $1.1 billion
> Federal income tax (including rebates): -$25 million
> Effective tax rate: -2.3%
> Industry: Financial data services

Source: RiverNorthPhotography / iStock Unreleased via Getty Images
13. FirstEnergy
> U.S. pre-tax income: $1.1 billion
> Federal income tax (including rebates): -$14 million
> Effective tax rate: -1.3%
> Industry: Utilities, gas and electric

Source: JHVEPhoto / iStock Editorial via Getty Images
12. Advanced Micro Devices
> U.S. pre-tax income: $1.2 billion
> Federal income tax (including rebates): $0
> Effective tax rate: 0.0%
> Industry: Technology

Source: wellesenterprises / iStock Editorial via Getty Images
11. FedEx
> U.S. pre-tax income: $1.2 billion
> Federal income tax (including rebates): -$230 million
> Effective tax rate: -18.9%
> Industry: Miscellaneous services
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