The latest regulatory threat to investment bank trading businesses first registered with the number-crunchers sat inside market risk departments. Now, as the finalisation of the new rules draws closer, it is beginning to catch the attention of investment bank chief executives.

The Basel Committee on Banking Supervision started a process to change the way trading book capital requirements were calculated in 2012 and intends to finalise its work - titled the Fundamental Review of the Trading Book - by the end of this year.