Beijing introduced new rules this month cracking down on overseas investments, citing national security concerns and cranking up curbs on buying US shares that were imposed on Chinese investors in May.But mainland investors are still streaming to Hong Kong, where regulations are relatively freer, hoping to trade US stocks.Feng, who arrived on an overnight train from eastern China, opened three accounts in one day, telling AFP she did not want to miss the chance to invest in US firms.Although US markets have been volatile recently, "they're still much better than the Chinese stock market", she said.Seasoned investor Tao flew to Hong Kong from Shanghai, telling AFP he spent two weeks opening bank and broker accounts to retain access to US stocks.CrackdownChina has long imposed strict foreign exchange controls on its citizens in order to maintain regulatory sovereignty and stabilise the valuation of its currency, the yuan.Mainland investors have been seeking to diversify their holdings in recent years as a debt crisis has crippled the Chinese property sector, long viewed as a safe bet to park assets, analysts told AFP.The new restrictions come after Beijing slapped more than $330 million in fines in May on major brokers Futu, Tiger and Longbridge, saying they had aided mainland Chinese investors to trade overseas despite lacking the required licences.Authorities ordered the firms to phase out cross-border businesses in China within two years, vowing to "completely eradicate" such illegal operations.An employee from one of the firms told AFP on condition of anonymity that the severity of the crackdown was unprecedented, despite a previous penalty in 2022.Investing in US assets in China usually requires going through officially approved channels and is typically subject to ceilings and strict foreign exchange controls.Designer Iain Wu, a longtime broker platform user, said investors would lose opportunities such as trading newly listed global firms.The measures signal "China's efforts to control the outflow of citizens' funds and assets", he said."I'm concerned that regulations will tighten even further, such as by limiting the annual investment quota per person," Wu added.'Grey areas'Households, institutions and companies shifted an estimated record of $807 billion in assets moved out of China in 2025, according to a Bloomberg report citing the Institute of International Finance's data.The outflows have come as Chinese policymakers have struggled to sustain a post-pandemic economic revival, with annual growth slowing, consumption stuttering and property sector debt mounting.Top leaders have also spooked some investors by signalling a desire to tackle deep-seated wealth inequality.