Management levels equality drive for men and women launched by CMI
A business group has launched a drive to achieve parity between the number of men and women in management by 2024.
The Chartered Management Institute (CMI) said 1.5 million new female managers would be needed to reach the target.
Women outnumbered men at junior level, but not enough were promoted to middle management or to top positions, said the CMI.
Chief executive Ann Francke said: "Unlocking the 'missing middle' of women managers is essential as UK businesses face up to the challenge of tackling the productivity gap that currently leaves us lagging 21% behind our G7 competitors.
"In the run-up to Brexit we must do everything we can to support business growth to ensure the UK can stand alone, and it's clear that women are still the primary untapped resource in the workplace."