Chief executive Richard Moross said: "At Moo we're trying to build a company that reflects the world around us".
Companies who haven't yet revealed the data were sent a final warning and not doing so till the deadline would be considered as breaking the law.
Moo employs 237 women out of a total workforce of 451, though 46% of its staff work outside the United Kingdom and are not subject to the government's criteria on data.
Of the around 9,000 firms with more than 250 staff required to report by midnight, the BBC notes 8,870 had done so as of 7.00am.
Of the carrier's 554 pilots, more than 540 are men; meanwhile its lower paid cabin crew are predominantly female. At Unilever, women's median hourly rate is 1.3% higher than men's.
In another - Abellio Scotrail - the difference in median hourly pay is 27.2 per cent.
"Many organizations consider the gender pay gap to be acceptable if men and women do different jobs or that men hold more senior positions than women. this is worrying", said Hazel Conley, a professor of human resource management at the University of the West of England.
How does gender pay gap reporting work?
"We undervalue the roles that women do deliver on.so that puts them on the back foot in the first place".
Soccer clubs are prime offenders, dominating the top ranks of companies with the biggest mean gender pay gaps.
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Women earn less than men in all OECD countries.
45 companies have reported a 0 per cent gap on both median and mean averages.
Bonus pay is given to 32% of male employees and 29% of female employees.
The government hopes that "naming and shaming" companies with large pay gaps will force them to take steps to tackle inequality.
When there are so few of us, the ability to start a conversation is a catch twenty-two.
The company employs more than 6,000 workers in the UK and operates in three segments - Apple (UK) Ltd, Apple Europe Ltd and Apple Retail UK Ltd. The search giant's female employees' mean hourly rate is 17 per cent lower than men's, and their median rate is 16 per cent lower.
"If we discount from the data the small number of shareholder related bonuses paid during the sample period then mean average bonus gap is eradicated completely".
Apple has three companies in the United Kingdom, and reported numbers for all of them.
The publisher has also said it will ensure a diversity in candidates for all Senior Leadership Team roles.
Over half of women (51 per cent) who have a bank account are likely to switch their bank, compared to 37 per cent of men. "We know we're not where we need to be, and we're committed to making real progress".