A new stock exchange set up for smaller companies opens trading in Beijing on Nov.15, amid a crackdown on the country’s tech giants that has wiped more than $1 trillion off their market value abroad. The new bourse in the capital city joins two other exchanges in Shanghai and the southern city of Shenzhen, mainland China’s financial hubs. Analysts said the Beijing Stock Exchange was intended to give the political center more economic influence. A total of 81 companies started trading on the Beijing Stock Exchange Monday, and the performances were mixed. The shares of 10 newly listed companies surged by over 60 percent, triggering circuit breakers. Henan Tongxin Transmission Co., a maker of industrial parts, soared by over 500 percent in its market debut. But 71 other firms, which migrated from the existing over-the-counter market for small companies, commonly known as the New Third Board, rose or fell by …