* SSEC -0.6%, CSI300 -0.7%, HSI -2.0% * HK->Shanghai Connect daily quota used -2.8%, Shanghai->HK daily quota used 0.4% * FTSE China A50 -1.5% SHANGHAI, July 8(Reuters) - Hong Kong stocks fell on Thursday to a six-month low, as tech firms slumped on persistent regulatory worries. ** The Hang Seng index dropped 2.0%, to 27,401.12 points, lowest since Jan. 5, while the Hong Kong China Enterprises Index lost 2.4%, to 9,908.37. ** Falling the most, the Hang Seng tech index tumbled 3% by the midday break to its lowest since Oct. 7, on track for a seventh straight day of losses. ** Bilibili Inc, Meituan, Baidu Inc and JD.Com Inc retreated between 3.6% and 7.7%. ** Tencent and Alibaba fell 2.9% and 2.7%, respectively. ** China’s market regulator said on Wednesday it has fined a number of internet companies including Didi Chuxing, Tencent and Alibaba for failing to report earlier merger and acquisition deals for approval, according to a statement on the website of the State Administration of Market Regulation (SAMR). ** Amid persistent regulatory worries, Linus Yip, chief strategist at First Shanghai Securities said，”those leading tech companies are still in the process of seeking a bottom.” ** He added a decreasing U.S. ten-year yield since June also dampen the appeal of traditional cyclical firms, making investors more reluctant to rotate when there was a slump in new economy stocks. ** On the mainland, the CSI300 index fell 0.7%, to 5,105.07 points at the end of the morning session, while the Shanghai Composite Index lost 0.6%, to 3,533.63 points. ** Leading the losses, the CSI300 financial index and the CSI300 energy index retreated 2% and 2.4%. ** China will use timely cuts in the bank reserve requirement ratio (RRR) to support the real economy, especially small firms, the cabinet said on Wednesday. ** There will not necessarily be a RRR cut after Beijing floats one, and it’s yet to be a turnaround and investors should not overly expect loosening, Huachuang Securities analysts noted in a report. (Reporting by Luoyan Liu and Andrew Galbraith; Editing by Shailesh Kuber) Our Standards: The Thomson Reuters Trust Principles.