Bank of America pays female staff in Britain 28.7% less on average than male employees, according to a report released Tuesday.
The divide widens to 57.9% for year-end discretionary bonuses. The newly required disclosures compare the total earned by all male U.K. staff with the total for the female staff.
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The gap reflects the high concentration of men in more lucrative senior positions; a bigger share of lower-paid jobs are held by women.
The disparity in pay at the U.S. bank's British unit is narrower than at HSBC, where women were paid an average 59% less than male employees. Goldman Sachs reported a gender pay gap of 56% for its employees.
The national average pay gap is about 18%, according to the Office for National Statistics.
"We are committed to bringing more women into financial services at a senior level, and into roles that offer the prospect of significant progression," Bank of America said in the report.