https://www.reuters.com/article/us-china-markets-star/circuit-breakers-trip-shares-soar-as-chinas-nasdaq-style-bourse-debuts-idUSKCN1UH03G >Trading hit a fever pitch, with shares rocketing as much as 520%, as China's new Nasdaq-style board for homegrown tech firms debuted on Monday, with valuations exceeding even the expectations of veteran investors braced for a wild ride.