At around 2pm the Financial Conduct Authority (FCA) is expected to announce penalties in excess of £50m for JP Morgan over failing to properly supervise its traders, according to Sky News.
The derivatives losses resulting from these failures cost JP Morgan more than £3.7bn last year.
Total fines from US and UK government agencies over the affair are expected to cost the bank more than £495m when they are revealed this week.
The FCA declined to comment on today’s upcoming announcement.
Yesterday the Japanese investment banking unit of UBS was ordered to pay a $100m (£62m) criminal fine after pleading guilty in December to its involvement in the Libor scandal.