Charlie Porter is to step down from all of his executive roles at F&C Asset Management, including chief executive of its Thames River Capital business, 18 months after entrepreneur Edward Bramson swept to power in F&C's boardroom in a shareholder coup.

The UK-listed fund manager announced Porter's move in its interim financial statement, which said: "Following the successful integration of the Thames River business and investment teams into the F&C Group, Charlie Porter will be stepping down from his role as chief executive of Thames River with effect from 30 September 2012."