The watchdog says it wants to stop a "race to the bottom" and will implement far-reaching rules which financial institutions, including central banks, will have to follow.
The terms of the UK's exit will be the subject of intense negotiations over the next two years, and are expected to be closely followed by investment managers, together with the rest of the financial services industry.
NCI was set up in 2010 with five member firms, including Johnson’s Somerset Capital, and has grown to boast 52 members, which run around £400 billion.
Since the UK voted to leave the EU the domestic economy has experienced a more muted reaction than expected, as has the UK stock market. Sterling, however, has declined.