Nucleus, Old Mutual Wealth and the Personal Investment Management & Financial Advice Association are among the latest signatories to the Women in Finance charter.
They are among a further 26 firms to have signed up to the charter since July, meaning firms with 600,000 employees have committed to the initiative from HM Treasury.
The total number of firms signed up to the charter is now 162 and HM Treasury has estimated about half the employees of financial services companies are now covered by the initiative.
The charter asks financial firms to commit to four industry actions to prepare their female talent for leadership positions.
The 26 firms to have signed the charter since July will announce their targets for female representation in senior roles in February 2018.
Stephen Barclays, economic secretary to HM Treasury, said: “This is another excellent group of signatories to the Women in Finance Charter.
“Their actions, alongside those of the other signatories, have the potential to make the UK’s pre-eminent financial services sector more representative and more inclusive.
“I’m keen to see even more firms follow their example and make a positive, public commitment to improve gender balance in our financial services.”
Of the firms to have signed the charter, 120 have committed to have at least 30 per cent women in senior roles by 2021 and of those, 40 firms have committed to a 50/50 gender split in senior roles by 2021.
Among the other new signatories to the charter are the Payment Systems Regulator, RSA Group, Allianz Insurance, UK Finance, the Association for Financial Markets in Europe and Funding Circle.