More than half of UK companies failed to narrow their gender pay gaps in the second year of compulsory reporting.
Overall, 52% of private companies did not narrow the divide from the previous year, data released on Friday showed.
The figures showed 78% of firms had a pay gap in favour of men while 14% favoured women, with the remainder reporting no gap.
Firms had until midnight to file their gender pay gaps – by which time 10,428 had done so – or face legal action.
At the deadline, the median pay gap had lowered slightly from 9.7% last year to 9.6%.
At 45% of firms the pay gap had widened in favour of men.
By law, all companies, charities and public sector departments of 250 employees or more must