A city banking task-force is set to write to lenders quizzing them on company ethics.
The Banking Standards Board (BSB), chaired by former telecoms regulator Dame Colette Bowe, aims to boost integrity in the banking sector.
Barclays, HSBC, Lloyds Banking Group, Nationwide, Royal Bank of Scotland, Santander and Standard Charter are all set to participate in the review.
The BSB was set up on the recommendation of Sir Richard Lambert, former director general of the Confederation of British Industry (CBI), and was formed in May 2014 after banks agreed to take part in the annual review.
He joins representatives from Morgan Stanley, Citi, HSBC, Nationwide and Metro Bank on the panel.
Bowe said: “Investors are in pole position when it comes to strengthening banking reputations as bank boards will always pay attention if they become dissatisfied.”