Bombay Stock Exchange Ltd (BSE), Asia’s oldest, will pick a 15% stake in United Stock Exchange of India Ltd (USX) and will jointly offer currency futures trading, said a person familiar with the development. BSE’s board, which met on Wednesday evening to discuss this, approved it unanimously, the person said. He declined to be identified because he is not authorized to speak to the media. BSE spokesperson Kalyan Bose declined comment. “There have been some general discussions between BSE and us,” said T.S. Narayanasami, who on Tuesday was appointed as managing director and chief executive officer of USX. […]