Jones Day now faces allegations of gender bias in its Atlanta and New York offices, as three formerly anonymous, female ex-associates have unmasked themselves, and one new accuser has joined their claims in the $200 million class action against the firm.

The 127-page amended complaint, filed late on Monday, also includes new salary details from the six original plaintiffs. These purportedly demonstrate that, contrary to Jones Day's assertion that top-performing associates earn at the "upper level of the markets in which we operate", the women were not compensated along the "Cravath scale".

Following several rounds of sparring over four original accusers' rights to proceed anonymously, three of the women agreed earlier this month to reveal their identities, while one is still seeking to preserve her privacy for three months based on concerns about her health and job search.