Almost two-thirds of disciplinary cases deal with by the Occupational Pensions Regulatory Authority involve company bosses failing to pay in pension contributions on time.
Figures for July and August show the vast majority of the cases Opra tackles concern company employers who have failed to put cash into workers' pension schemes within 19 days of the following month after taking cash from their payrolls.
In September the new rules led to the first prison sentence under the 1995 Pensions Act being handed down.
Stuart Dixon, formerly of Biltons Tableware, Stoke-on-Trent, was sentenced to six months after admitting to nine charges of failing to pay employees' pension contributions on time.
Cerebral palsy charity Scope has also been hit with a £25,000 bill.
In July it was ordered to pay £25,000 in fines and costs after admitting to nine separate instances of making late payments of pension contributions.