The government has named companies that did not pay some staff the minimum wage.
The latest list includes Northern Ireland businesses, racing trainers Alan King and Lucinda Russell, and retailer B&Q.
Those named must repay the money owed to staff.
Separately, new figures suggest that wages are trailing inflation.
That is a worrying economic indicator.
Prices are climbing more quickly than wages, leaving workers with less spending power.
The government list and the pay data both point to financial strain for workers.
Officials said enforcement action would follow for employers who broke minimum wage rules.