CSR rises on Bluetooth demand

British chipmaker CSR said yesterday that demand for its technology in wireless speaker systems used with smartphones helped first-quarter numbers beat market expectations, sending its shares to a five-year high. The company, which specialises in Bluetooth wireless chips, posted a jump in underlying operating profit to $19.1m (£12.3m), from $2.7m for the same period a year ago, on five per cent higher revenue of $237.9m.