Overseas capital has poured into China’s hard technology champions at an unprecedented pace, driving the market value of their mainland equity holdings to an all-time high by the end of this year’s second quarter. Global investors have increased their exposure to China’s advanced manufacturing and technology companies, helping push the northbound holdings under the mainland-Hong Kong Stock Connect scheme to a record high of 3.13 trillion yuan (US$461.65 billion) by the end of June, according to...