The "Wage gap" is a myth. It's a bullshit statistic that fails to take into account the personal choices people make. Women are more likley to go for a job that allows more flexibility rather than high pay. Companies are not discriminating against women. Instead women are making discriminating choices about the market.
Warren Farrell-
"higher-paying jobs are more likely to require longer commuting times, safety risks, frequent travel, long hours and other factors that, on his tests, led the men to stand while the women sat. Those jobs pay more because fewer people want to do them. It's not sexism. It's just supply and demand. In some fields, like office jobs — finance for example — women make as much or more than men."