(Reuters) - China has launched an investigation into Alibaba Group for suspected monopolistic behaviour and will summon its Ant Group to meet in coming days, regulators said, in the latest blow for Jack Ma’s e-commerce and fintech empire. Here’s a timeline of key events leading up to the investigation. SEPT 14 - CHINA ROLLS OUT NEW RULES FOR FINANCIAL HOLDING FIRMS China issues new rules to regulate financial holding companies, with the central bank saying there had been a loophole in regulations for such companies. Ant was among companies named by Pan Gongsheng, the People’s Bank of China vice governor. Ant wins the final nod from China’s top securities watchdog to register its Shanghai IPO, clearing the last regulatory hurdle for its issue. OCT 24 - “OLD MAN’S CLUB Ant prices its IPO and secures the backing of strategic investors including a unit of Singapore state investor Temasek Holdings, as well as Singaporean and Abu Dhabi sovereign wealth funds, large Chinese insurers and mutual funds. OCT 30 - MOM-AND-POP INVESTORS BID $3 TRILLION FOR ANT’S SHARES Retail investors bid for a record $3 trillion worth of shares in Ant’s dual listing, the equivalent of Britain’s gross domestic product, as they bet on demand for Ant’s financial technology services in China. China’s Financial Stability and Development Committee, a cabinet-level body headed by Vice Premier Liu He, flags risks associated with the rapid development of fintech, at a meeting that was widely interpreted as a government response to the rise of players such as Ant. Four of China’s top financial regulators say they conducted regulatory talks with Ant’s top two executives and Ma. Chinese regulators recommend tighter regulations for online micro-lending companies to help contain potential financial risks and rein in rising debt levels. The Shanghai stock exchange suspends Ant’s IPO on its tech-focused STAR Market, citing the regulatory talks as a “material event” and a tougher regulatory environment as factors that may disqualify Ant from listing. The move prompted Ant to also freeze the Hong Kong leg of its dual listing. NOV 10 - CHINA PUBLISHES DRAFT ANTI-MONOPOLY RULES FOR INTERNET China published draft rules aimed at preventing monopolistic behaviour by internet platforms, a move that will increase scrutiny on e-commerce marketplaces and payment services belonging to the likes of Alibaba Group. NOV 23 - ALIBABA CEO SAYS CHINA’S SCRUTINY OF INTERNET PLATFORMS IS NEEDED China’s increasing oversight of internet platforms is both “timely and necessary”, Alibaba Group CEO Daniel Zhang told the World Internet Conference. China warned its Internet giants it would not tolerate monopolistic practices and to brace for increased scrutiny, as it slapped fines and announced probes into deals involving Alibaba Group and Tencent Holdings.