Subway is leading the fast food industry in underpaying workers.
That's according to a CNN Money analysis of data collected by the Department of Labor's Wage and Hour Division.
Individual Subway franchisees have been found in violation of pay and hour rules in more than 1,100 investigations from 2000 to 2013.
Combined, these cases found about 17,000 fair labor standards act violations.
And they resulted in franchisees having to reimburse Subway workers more than $3.8-million over the years.
Subway has more than 26,000 locations throughout the country.
That's the most of any fast food chain.
Subway declined to comment on the analysis.