London-based derivatives analytics company, OpenGamma is expanding its business into North America. : The firm’s expansion plans come as regulatory and macroeconomic pressures continue to hit hedge funds and asset managers with offices all over the world. Specific rules on clearing houses means that hedge fund managers can now be charged additional margin known as ‘liquidity add-on’ which can increase the cost of margin by 70 per cent. This increase is inadvertently hitting end investor returns as hedge funds continue to lock down more and more capital.