White & Case has joined the growing group of law firms including partners in their gender pay gap reporting, as more and more respond to calls for transparency by voluntarily disclosing such information.

The US firm – which is required to report its pay gap as it has more than 250 employees in London – has a mean gender pay gap of 64.8% when partners and employees are both included, with a median pay gap of 41.4%.

The figures are broadly comparable to those posted by the magic circle, all of which were compelled to report their figures – including partners – by the parliamentary committee investigating the effectiveness of the first year of gender pay gap reporting.

Law firms have faced significant pressure to include partner data in their reports, with government officials and MPs weighing in on the debate earlier this year.

White & Case's latest report also breaks down the data into two partner groups – salaried or contract partners, where the mean gender pay gap is 3.7% in favour of men; and equity partners, where the pay gap is 34.9% in favour of men.

Disregarding partners, the firm has a mean pay gap of 21.2% and a median gap of 46.7%.

Initiatives the firm has rolled out to improve the firm's gender balance have included coaching and mentoring sessions aimed at helping women assess and achieve their career goals, as well as unconscious bias training.

Newer initiatives include mandated gender-balanced shortlists when recruiting for all roles – a practice that has been in place for lateral hires for a number of years – and an improved system of work allocation.

A spokesperson for the firm said: "White & Case is committed to cultivating a workplace that is diverse, inclusive and fair for all, and where all our people have equal opportunities to succeed at every stage of their careers with the firm. This includes an ongoing drive to retain and advance more women into senior roles, and the implementation of policies and programmes that will address the causes of our gender pay gap in London."

The Law Society last month recommended that all law firms should voluntarily produce pay gap reports with partners included, and Macfarlanes recently followed the lead of the magic circle in doing so.